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dep: Add libpng 1.6.43

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This commit is contained in:
Stenzek
2024-03-06 16:16:50 +10:00
parent 250b1bea8f
commit b749c483da
44 changed files with 46381 additions and 33 deletions
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139
dep/libpng/src/arm/arm_init.c Normal file
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/* arm_init.c - NEON optimised filter functions
*
* Copyright (c) 2018-2022 Cosmin Truta
* Copyright (c) 2014,2016 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* This module requires POSIX 1003.1 functions. */
#define _POSIX_SOURCE 1
#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
#if PNG_ARM_NEON_OPT > 0
#ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
/* WARNING: it is strongly recommended that you do not build libpng with
* run-time checks for CPU features if at all possible. In the case of the ARM
* NEON instructions there is no processor-specific way of detecting the
* presence of the required support, therefore run-time detection is extremely
* OS specific.
*
* You may set the macro PNG_ARM_NEON_FILE to the file name of file containing
* a fragment of C source code which defines the png_have_neon function. There
* are a number of implementations in contrib/arm-neon, but the only one that
* has partial support is contrib/arm-neon/linux.c - a generic Linux
* implementation which reads /proc/cpufino.
*/
#include <signal.h> /* for sig_atomic_t */
#ifndef PNG_ARM_NEON_FILE
# if defined(__aarch64__) || defined(_M_ARM64)
/* ARM Neon is expected to be unconditionally available on ARM64. */
# error "PNG_ARM_NEON_CHECK_SUPPORTED must not be defined on ARM64"
# elif defined(__ARM_NEON__) || defined(__ARM_NEON)
/* ARM Neon is expected to be available on the target CPU architecture. */
# error "PNG_ARM_NEON_CHECK_SUPPORTED must not be defined on this CPU arch"
# elif defined(__linux__)
# define PNG_ARM_NEON_FILE "contrib/arm-neon/linux.c"
# else
# error "No support for run-time ARM Neon checking; use compile-time options"
# endif
#endif
static int png_have_neon(png_structp png_ptr);
#ifdef PNG_ARM_NEON_FILE
# include PNG_ARM_NEON_FILE
#endif
#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
#ifndef PNG_ALIGNED_MEMORY_SUPPORTED
# error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
#endif
void
png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
{
/* The switch statement is compiled in for ARM_NEON_API, the call to
* png_have_neon is compiled in for ARM_NEON_CHECK. If both are defined
* the check is only performed if the API has not set the NEON option on
* or off explicitly. In this case the check controls what happens.
*
* If the CHECK is not compiled in and the option is UNSET the behavior prior
* to 1.6.7 was to use the NEON code - this was a bug caused by having the
* wrong order of the 'ON' and 'default' cases. UNSET now defaults to OFF,
* as documented in png.h
*/
png_debug(1, "in png_init_filter_functions_neon");
#ifdef PNG_ARM_NEON_API_SUPPORTED
switch ((pp->options >> PNG_ARM_NEON) & 3)
{
case PNG_OPTION_UNSET:
/* Allow the run-time check to execute if it has been enabled -
* thus both API and CHECK can be turned on. If it isn't supported
* this case will fall through to the 'default' below, which just
* returns.
*/
#endif /* PNG_ARM_NEON_API_SUPPORTED */
#ifdef PNG_ARM_NEON_CHECK_SUPPORTED
{
static volatile sig_atomic_t no_neon = -1; /* not checked */
if (no_neon < 0)
no_neon = !png_have_neon(pp);
if (no_neon)
return;
}
#ifdef PNG_ARM_NEON_API_SUPPORTED
break;
#endif
#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
#ifdef PNG_ARM_NEON_API_SUPPORTED
default: /* OFF or INVALID */
return;
case PNG_OPTION_ON:
/* Option turned on */
break;
}
#endif
/* IMPORTANT: any new external functions used here must be declared using
* PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
* 'prefix' option to configure works:
*
* ./configure --with-libpng-prefix=foobar_
*
* Verify you have got this right by running the above command, doing a build
* and examining pngprefix.h; it must contain a #define for every external
* function you add. (Notice that this happens automatically for the
* initialization function.)
*/
pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
if (bpp == 3)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth3_neon;
}
else if (bpp == 4)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth4_neon;
}
}
#endif /* PNG_ARM_NEON_OPT > 0 */
#endif /* READ */

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dep/libpng/src/arm/filter_neon.S Normal file
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/* filter_neon.S - NEON optimised filter functions
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2014,2017 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* This is required to get the symbol renames, which are #defines, and the
* definitions (or not) of PNG_ARM_NEON_OPT and PNG_ARM_NEON_IMPLEMENTATION.
*/
#define PNG_VERSION_INFO_ONLY
#include "../pngpriv.h"
#if (defined(__linux__) || defined(__FreeBSD__)) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
#endif
#ifdef PNG_READ_SUPPORTED
/* Assembler NEON support - only works for 32-bit ARM (i.e. it does not work for
* ARM64). The code in arm/filter_neon_intrinsics.c supports ARM64, however it
* only works if -mfpu=neon is specified on the GCC command line. See pngpriv.h
* for the logic which sets PNG_USE_ARM_NEON_ASM:
*/
#if PNG_ARM_NEON_IMPLEMENTATION == 2 /* hand-coded assembler */
#if PNG_ARM_NEON_OPT > 0
#ifdef __ELF__
# define ELF
#else
# define ELF @
#endif
.arch armv7-a
.fpu neon
.macro func name, export=0
.macro endfunc
ELF .size \name, . - \name
.endfunc
.purgem endfunc
.endm
.text
/* Explicitly specifying alignment here because some versions of
* GAS don't align code correctly. This is harmless in correctly
* written versions of GAS.
*/
.align 2
.if \export
.global \name
.endif
ELF .type \name, STT_FUNC
.func \name
\name:
.endm
func png_read_filter_row_sub4_neon, export=1
ldr r3, [r0, #4] @ rowbytes
vmov.i8 d3, #0
1:
vld4.32 {d4[],d5[],d6[],d7[]}, [r1,:128]
vadd.u8 d0, d3, d4
vadd.u8 d1, d0, d5
vadd.u8 d2, d1, d6
vadd.u8 d3, d2, d7
vst4.32 {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
subs r3, r3, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_sub3_neon, export=1
ldr r3, [r0, #4] @ rowbytes
vmov.i8 d3, #0
mov r0, r1
mov r2, #3
mov r12, #12
vld1.8 {q11}, [r0], r12
1:
vext.8 d5, d22, d23, #3
vadd.u8 d0, d3, d22
vext.8 d6, d22, d23, #6
vadd.u8 d1, d0, d5
vext.8 d7, d23, d23, #1
vld1.8 {q11}, [r0], r12
vst1.32 {d0[0]}, [r1,:32], r2
vadd.u8 d2, d1, d6
vst1.32 {d1[0]}, [r1], r2
vadd.u8 d3, d2, d7
vst1.32 {d2[0]}, [r1], r2
vst1.32 {d3[0]}, [r1], r2
subs r3, r3, #12
bgt 1b
bx lr
endfunc
func png_read_filter_row_up_neon, export=1
ldr r3, [r0, #4] @ rowbytes
1:
vld1.8 {q0}, [r1,:128]
vld1.8 {q1}, [r2,:128]!
vadd.u8 q0, q0, q1
vst1.8 {q0}, [r1,:128]!
subs r3, r3, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_avg4_neon, export=1
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
1:
vld4.32 {d4[],d5[],d6[],d7[]}, [r1,:128]
vld4.32 {d16[],d17[],d18[],d19[]},[r2,:128]!
vhadd.u8 d0, d3, d16
vadd.u8 d0, d0, d4
vhadd.u8 d1, d0, d17
vadd.u8 d1, d1, d5
vhadd.u8 d2, d1, d18
vadd.u8 d2, d2, d6
vhadd.u8 d3, d2, d19
vadd.u8 d3, d3, d7
vst4.32 {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
subs r12, r12, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_avg3_neon, export=1
push {r4,lr}
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
mov r0, r1
mov r4, #3
mov lr, #12
vld1.8 {q11}, [r0], lr
1:
vld1.8 {q10}, [r2], lr
vext.8 d5, d22, d23, #3
vhadd.u8 d0, d3, d20
vext.8 d17, d20, d21, #3
vadd.u8 d0, d0, d22
vext.8 d6, d22, d23, #6
vhadd.u8 d1, d0, d17
vext.8 d18, d20, d21, #6
vadd.u8 d1, d1, d5
vext.8 d7, d23, d23, #1
vld1.8 {q11}, [r0], lr
vst1.32 {d0[0]}, [r1,:32], r4
vhadd.u8 d2, d1, d18
vst1.32 {d1[0]}, [r1], r4
vext.8 d19, d21, d21, #1
vadd.u8 d2, d2, d6
vhadd.u8 d3, d2, d19
vst1.32 {d2[0]}, [r1], r4
vadd.u8 d3, d3, d7
vst1.32 {d3[0]}, [r1], r4
subs r12, r12, #12
bgt 1b
pop {r4,pc}
endfunc
.macro paeth rx, ra, rb, rc
vaddl.u8 q12, \ra, \rb @ a + b
vaddl.u8 q15, \rc, \rc @ 2*c
vabdl.u8 q13, \rb, \rc @ pa
vabdl.u8 q14, \ra, \rc @ pb
vabd.u16 q15, q12, q15 @ pc
vcle.u16 q12, q13, q14 @ pa <= pb
vcle.u16 q13, q13, q15 @ pa <= pc
vcle.u16 q14, q14, q15 @ pb <= pc
vand q12, q12, q13 @ pa <= pb && pa <= pc
vmovn.u16 d28, q14
vmovn.u16 \rx, q12
vbsl d28, \rb, \rc
vbsl \rx, \ra, d28
.endm
func png_read_filter_row_paeth4_neon, export=1
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
vmov.i8 d20, #0
1:
vld4.32 {d4[],d5[],d6[],d7[]}, [r1,:128]
vld4.32 {d16[],d17[],d18[],d19[]},[r2,:128]!
paeth d0, d3, d16, d20
vadd.u8 d0, d0, d4
paeth d1, d0, d17, d16
vadd.u8 d1, d1, d5
paeth d2, d1, d18, d17
vadd.u8 d2, d2, d6
paeth d3, d2, d19, d18
vmov d20, d19
vadd.u8 d3, d3, d7
vst4.32 {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
subs r12, r12, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_paeth3_neon, export=1
push {r4,lr}
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
vmov.i8 d4, #0
mov r0, r1
mov r4, #3
mov lr, #12
vld1.8 {q11}, [r0], lr
1:
vld1.8 {q10}, [r2], lr
paeth d0, d3, d20, d4
vext.8 d5, d22, d23, #3
vadd.u8 d0, d0, d22
vext.8 d17, d20, d21, #3
paeth d1, d0, d17, d20
vst1.32 {d0[0]}, [r1,:32], r4
vext.8 d6, d22, d23, #6
vadd.u8 d1, d1, d5
vext.8 d18, d20, d21, #6
paeth d2, d1, d18, d17
vext.8 d7, d23, d23, #1
vld1.8 {q11}, [r0], lr
vst1.32 {d1[0]}, [r1], r4
vadd.u8 d2, d2, d6
vext.8 d19, d21, d21, #1
paeth d3, d2, d19, d18
vst1.32 {d2[0]}, [r1], r4
vmov d4, d19
vadd.u8 d3, d3, d7
vst1.32 {d3[0]}, [r1], r4
subs r12, r12, #12
bgt 1b
pop {r4,pc}
endfunc
#endif /* PNG_ARM_NEON_OPT > 0 */
#endif /* PNG_ARM_NEON_IMPLEMENTATION == 2 (assembler) */
#endif /* READ */

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dep/libpng/src/arm/filter_neon_intrinsics.c Normal file
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/* filter_neon_intrinsics.c - NEON optimised filter functions
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2014,2016 Glenn Randers-Pehrson
* Written by James Yu <james.yu at linaro.org>, October 2013.
* Based on filter_neon.S, written by Mans Rullgard, 2011.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
/* This code requires -mfpu=neon on the command line: */
#if PNG_ARM_NEON_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_ARM64)
# include <arm64_neon.h>
#else
# include <arm_neon.h>
#endif
/* libpng row pointers are not necessarily aligned to any particular boundary,
* however this code will only work with appropriate alignment. arm/arm_init.c
* checks for this (and will not compile unless it is done). This code uses
* variants of png_aligncast to avoid compiler warnings.
*/
#define png_ptr(type,pointer) png_aligncast(type *,pointer)
#define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer)
/* The following relies on a variable 'temp_pointer' being declared with type
* 'type'. This is written this way just to hide the GCC strict aliasing
* warning; note that the code is safe because there never is an alias between
* the input and output pointers.
*
* When compiling with MSVC ARM64, the png_ldr macro can't be passed directly
* to vst4_lane_u32, because of an internal compiler error inside MSVC.
* To avoid this compiler bug, we use a temporary variable (vdest_val) to store
* the result of png_ldr.
*/
#define png_ldr(type,pointer)\
(temp_pointer = png_ptr(type,pointer), *temp_pointer)
#if PNG_ARM_NEON_OPT > 0
void
png_read_filter_row_up_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
png_const_bytep pp = prev_row;
png_debug(1, "in png_read_filter_row_up_neon");
for (; rp < rp_stop; rp += 16, pp += 16)
{
uint8x16_t qrp, qpp;
qrp = vld1q_u8(rp);
qpp = vld1q_u8(pp);
qrp = vaddq_u8(qrp, qpp);
vst1q_u8(rp, qrp);
}
}
void
png_read_filter_row_sub3_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x16_t vtmp = vld1q_u8(rp);
uint8x8x2_t *vrpt = png_ptr(uint8x8x2_t, &vtmp);
uint8x8x2_t vrp = *vrpt;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
png_debug(1, "in png_read_filter_row_sub3_neon");
for (; rp < rp_stop;)
{
uint8x8_t vtmp1, vtmp2;
uint32x2_t *temp_pointer;
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
vtmp2 = vext_u8(vrp.val[0], vrp.val[1], 6);
vdest.val[1] = vadd_u8(vdest.val[0], vtmp1);
vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
vdest.val[2] = vadd_u8(vdest.val[1], vtmp2);
vdest.val[3] = vadd_u8(vdest.val[2], vtmp1);
vtmp = vld1q_u8(rp + 12);
vrpt = png_ptr(uint8x8x2_t, &vtmp);
vrp = *vrpt;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
rp += 3;
}
PNG_UNUSED(prev_row)
}
void
png_read_filter_row_sub4_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
png_debug(1, "in png_read_filter_row_sub4_neon");
for (; rp < rp_stop; rp += 16)
{
uint32x2x4_t vtmp = vld4_u32(png_ptr(uint32_t,rp));
uint8x8x4_t *vrpt = png_ptr(uint8x8x4_t,&vtmp);
uint8x8x4_t vrp = *vrpt;
uint32x2x4_t *temp_pointer;
uint32x2x4_t vdest_val;
vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
vdest.val[1] = vadd_u8(vdest.val[0], vrp.val[1]);
vdest.val[2] = vadd_u8(vdest.val[1], vrp.val[2]);
vdest.val[3] = vadd_u8(vdest.val[2], vrp.val[3]);
vdest_val = png_ldr(uint32x2x4_t, &vdest);
vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
}
PNG_UNUSED(prev_row)
}
void
png_read_filter_row_avg3_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_const_bytep pp = prev_row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x16_t vtmp;
uint8x8x2_t *vrpt;
uint8x8x2_t vrp;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
vtmp = vld1q_u8(rp);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
png_debug(1, "in png_read_filter_row_avg3_neon");
for (; rp < rp_stop; pp += 12)
{
uint8x8_t vtmp1, vtmp2, vtmp3;
uint8x8x2_t *vppt;
uint8x8x2_t vpp;
uint32x2_t *temp_pointer;
vtmp = vld1q_u8(pp);
vppt = png_ptr(uint8x8x2_t,&vtmp);
vpp = *vppt;
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
vtmp3 = vext_u8(vrp.val[0], vrp.val[1], 6);
vdest.val[1] = vhadd_u8(vdest.val[0], vtmp2);
vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 6);
vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
vtmp = vld1q_u8(rp + 12);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
vdest.val[2] = vhadd_u8(vdest.val[1], vtmp2);
vdest.val[2] = vadd_u8(vdest.val[2], vtmp3);
vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
vdest.val[3] = vhadd_u8(vdest.val[2], vtmp2);
vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
rp += 3;
}
}
void
png_read_filter_row_avg4_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
png_const_bytep pp = prev_row;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
png_debug(1, "in png_read_filter_row_avg4_neon");
for (; rp < rp_stop; rp += 16, pp += 16)
{
uint32x2x4_t vtmp;
uint8x8x4_t *vrpt, *vppt;
uint8x8x4_t vrp, vpp;
uint32x2x4_t *temp_pointer;
uint32x2x4_t vdest_val;
vtmp = vld4_u32(png_ptr(uint32_t,rp));
vrpt = png_ptr(uint8x8x4_t,&vtmp);
vrp = *vrpt;
vtmp = vld4_u32(png_ptrc(uint32_t,pp));
vppt = png_ptr(uint8x8x4_t,&vtmp);
vpp = *vppt;
vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vdest.val[1] = vhadd_u8(vdest.val[0], vpp.val[1]);
vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
vdest.val[2] = vhadd_u8(vdest.val[1], vpp.val[2]);
vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
vdest.val[3] = vhadd_u8(vdest.val[2], vpp.val[3]);
vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
vdest_val = png_ldr(uint32x2x4_t, &vdest);
vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
}
}
static uint8x8_t
paeth(uint8x8_t a, uint8x8_t b, uint8x8_t c)
{
uint8x8_t d, e;
uint16x8_t p1, pa, pb, pc;
p1 = vaddl_u8(a, b); /* a + b */
pc = vaddl_u8(c, c); /* c * 2 */
pa = vabdl_u8(b, c); /* pa */
pb = vabdl_u8(a, c); /* pb */
pc = vabdq_u16(p1, pc); /* pc */
p1 = vcleq_u16(pa, pb); /* pa <= pb */
pa = vcleq_u16(pa, pc); /* pa <= pc */
pb = vcleq_u16(pb, pc); /* pb <= pc */
p1 = vandq_u16(p1, pa); /* pa <= pb && pa <= pc */
d = vmovn_u16(pb);
e = vmovn_u16(p1);
d = vbsl_u8(d, b, c);
e = vbsl_u8(e, a, d);
return e;
}
void
png_read_filter_row_paeth3_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_const_bytep pp = prev_row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x16_t vtmp;
uint8x8x2_t *vrpt;
uint8x8x2_t vrp;
uint8x8_t vlast = vdup_n_u8(0);
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
vtmp = vld1q_u8(rp);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
png_debug(1, "in png_read_filter_row_paeth3_neon");
for (; rp < rp_stop; pp += 12)
{
uint8x8x2_t *vppt;
uint8x8x2_t vpp;
uint8x8_t vtmp1, vtmp2, vtmp3;
uint32x2_t *temp_pointer;
vtmp = vld1q_u8(pp);
vppt = png_ptr(uint8x8x2_t,&vtmp);
vpp = *vppt;
vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
vdest.val[1] = paeth(vdest.val[0], vtmp2, vpp.val[0]);
vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 6);
vtmp3 = vext_u8(vpp.val[0], vpp.val[1], 6);
vdest.val[2] = paeth(vdest.val[1], vtmp3, vtmp2);
vdest.val[2] = vadd_u8(vdest.val[2], vtmp1);
vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
vtmp = vld1q_u8(rp + 12);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
vdest.val[3] = paeth(vdest.val[2], vtmp2, vtmp3);
vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
vlast = vtmp2;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
rp += 3;
}
}
void
png_read_filter_row_paeth4_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
png_const_bytep pp = prev_row;
uint8x8_t vlast = vdup_n_u8(0);
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
png_debug(1, "in png_read_filter_row_paeth4_neon");
for (; rp < rp_stop; rp += 16, pp += 16)
{
uint32x2x4_t vtmp;
uint8x8x4_t *vrpt, *vppt;
uint8x8x4_t vrp, vpp;
uint32x2x4_t *temp_pointer;
uint32x2x4_t vdest_val;
vtmp = vld4_u32(png_ptr(uint32_t,rp));
vrpt = png_ptr(uint8x8x4_t,&vtmp);
vrp = *vrpt;
vtmp = vld4_u32(png_ptrc(uint32_t,pp));
vppt = png_ptr(uint8x8x4_t,&vtmp);
vpp = *vppt;
vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vdest.val[1] = paeth(vdest.val[0], vpp.val[1], vpp.val[0]);
vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
vdest.val[2] = paeth(vdest.val[1], vpp.val[2], vpp.val[1]);
vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
vdest.val[3] = paeth(vdest.val[2], vpp.val[3], vpp.val[2]);
vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
vlast = vpp.val[3];
vdest_val = png_ldr(uint32x2x4_t, &vdest);
vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
}
}
#endif /* PNG_ARM_NEON_OPT > 0 */
#endif /* PNG_ARM_NEON_IMPLEMENTATION == 1 (intrinsics) */
#endif /* READ */

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/* palette_neon_intrinsics.c - NEON optimised palette expansion functions
*
* Copyright (c) 2018-2019 Cosmin Truta
* Copyright (c) 2017-2018 Arm Holdings. All rights reserved.
* Written by Richard Townsend <Richard.Townsend@arm.com>, February 2017.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
#include "../pngpriv.h"
#if PNG_ARM_NEON_IMPLEMENTATION == 1
#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_ARM64)
# include <arm64_neon.h>
#else
# include <arm_neon.h>
#endif
/* Build an RGBA8 palette from the separate RGB and alpha palettes. */
void
png_riffle_palette_neon(png_structrp png_ptr)
{
png_const_colorp palette = png_ptr->palette;
png_bytep riffled_palette = png_ptr->riffled_palette;
png_const_bytep trans_alpha = png_ptr->trans_alpha;
int num_trans = png_ptr->num_trans;
int i;
/* Initially black, opaque. */
uint8x16x4_t w = {{
vdupq_n_u8(0x00),
vdupq_n_u8(0x00),
vdupq_n_u8(0x00),
vdupq_n_u8(0xff),
}};
png_debug(1, "in png_riffle_palette_neon");
/* First, riffle the RGB colours into an RGBA8 palette.
* The alpha component is set to opaque for now.
*/
for (i = 0; i < 256; i += 16)
{
uint8x16x3_t v = vld3q_u8((png_const_bytep)(palette + i));
w.val[0] = v.val[0];
w.val[1] = v.val[1];
w.val[2] = v.val[2];
vst4q_u8(riffled_palette + (i << 2), w);
}
/* Fix up the missing transparency values. */
for (i = 0; i < num_trans; i++)
riffled_palette[(i << 2) + 3] = trans_alpha[i];
}
/* Expands a palettized row into RGBA8. */
int
png_do_expand_palette_rgba8_neon(png_structrp png_ptr, png_row_infop row_info,
png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
{
png_uint_32 row_width = row_info->width;
const png_uint_32 *riffled_palette =
(const png_uint_32 *)png_ptr->riffled_palette;
const png_uint_32 pixels_per_chunk = 4;
png_uint_32 i;
png_debug(1, "in png_do_expand_palette_rgba8_neon");
PNG_UNUSED(row)
if (row_width < pixels_per_chunk)
return 0;
/* This function originally gets the last byte of the output row.
* The NEON part writes forward from a given position, so we have
* to seek this back by 4 pixels x 4 bytes.
*/
*ddp = *ddp - ((pixels_per_chunk * sizeof(png_uint_32)) - 1);
for (i = 0; i < row_width; i += pixels_per_chunk)
{
uint32x4_t cur;
png_bytep sp = *ssp - i, dp = *ddp - (i << 2);
cur = vld1q_dup_u32 (riffled_palette + *(sp - 3));
cur = vld1q_lane_u32(riffled_palette + *(sp - 2), cur, 1);
cur = vld1q_lane_u32(riffled_palette + *(sp - 1), cur, 2);
cur = vld1q_lane_u32(riffled_palette + *(sp - 0), cur, 3);
vst1q_u32((void *)dp, cur);
}
if (i != row_width)
{
/* Remove the amount that wasn't processed. */
i -= pixels_per_chunk;
}
/* Decrement output pointers. */
*ssp = *ssp - i;
*ddp = *ddp - (i << 2);
return i;
}
/* Expands a palettized row into RGB8. */
int
png_do_expand_palette_rgb8_neon(png_structrp png_ptr, png_row_infop row_info,
png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
{
png_uint_32 row_width = row_info->width;
png_const_bytep palette = (png_const_bytep)png_ptr->palette;
const png_uint_32 pixels_per_chunk = 8;
png_uint_32 i;
png_debug(1, "in png_do_expand_palette_rgb8_neon");
PNG_UNUSED(row)
if (row_width <= pixels_per_chunk)
return 0;
/* Seeking this back by 8 pixels x 3 bytes. */
*ddp = *ddp - ((pixels_per_chunk * sizeof(png_color)) - 1);
for (i = 0; i < row_width; i += pixels_per_chunk)
{
uint8x8x3_t cur;
png_bytep sp = *ssp - i, dp = *ddp - ((i << 1) + i);
cur = vld3_dup_u8(palette + sizeof(png_color) * (*(sp - 7)));
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 6)), cur, 1);
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 5)), cur, 2);
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 4)), cur, 3);
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 3)), cur, 4);
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 2)), cur, 5);
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 1)), cur, 6);
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 0)), cur, 7);
vst3_u8((void *)dp, cur);
}
if (i != row_width)
{
/* Remove the amount that wasn't processed. */
i -= pixels_per_chunk;
}
/* Decrement output pointers. */
*ssp = *ssp - i;
*ddp = *ddp - ((i << 1) + i);
return i;
}
#endif /* PNG_ARM_NEON_IMPLEMENTATION */

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/* filter_sse2_intrinsics.c - SSE2 optimized filter functions
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2016-2017 Glenn Randers-Pehrson
* Written by Mike Klein and Matt Sarett
* Derived from arm/filter_neon_intrinsics.c
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
#if PNG_INTEL_SSE_IMPLEMENTATION > 0
#include <immintrin.h>
/* Functions in this file look at most 3 pixels (a,b,c) to predict the 4th (d).
* They're positioned like this:
* prev: c b
* row: a d
* The Sub filter predicts d=a, Avg d=(a+b)/2, and Paeth predicts d to be
* whichever of a, b, or c is closest to p=a+b-c.
*/
static __m128i load4(const void* p) {
int tmp;
memcpy(&tmp, p, sizeof(tmp));
return _mm_cvtsi32_si128(tmp);
}
static void store4(void* p, __m128i v) {
int tmp = _mm_cvtsi128_si32(v);
memcpy(p, &tmp, sizeof(int));
}
static __m128i load3(const void* p) {
png_uint_32 tmp = 0;
memcpy(&tmp, p, 3);
return _mm_cvtsi32_si128(tmp);
}
static void store3(void* p, __m128i v) {
int tmp = _mm_cvtsi128_si32(v);
memcpy(p, &tmp, 3);
}
void png_read_filter_row_sub3_sse2(png_row_infop row_info, png_bytep row,
png_const_bytep prev)
{
/* The Sub filter predicts each pixel as the previous pixel, a.
* There is no pixel to the left of the first pixel. It's encoded directly.
* That works with our main loop if we just say that left pixel was zero.
*/
size_t rb;
__m128i a, d = _mm_setzero_si128();
png_debug(1, "in png_read_filter_row_sub3_sse2");
rb = row_info->rowbytes;
while (rb >= 4) {
a = d; d = load4(row);
d = _mm_add_epi8(d, a);
store3(row, d);
row += 3;
rb -= 3;
}
if (rb > 0) {
a = d; d = load3(row);
d = _mm_add_epi8(d, a);
store3(row, d);
row += 3;
rb -= 3;
}
PNG_UNUSED(prev)
}
void png_read_filter_row_sub4_sse2(png_row_infop row_info, png_bytep row,
png_const_bytep prev)
{
/* The Sub filter predicts each pixel as the previous pixel, a.
* There is no pixel to the left of the first pixel. It's encoded directly.
* That works with our main loop if we just say that left pixel was zero.
*/
size_t rb;
__m128i a, d = _mm_setzero_si128();
png_debug(1, "in png_read_filter_row_sub4_sse2");
rb = row_info->rowbytes+4;
while (rb > 4) {
a = d; d = load4(row);
d = _mm_add_epi8(d, a);
store4(row, d);
row += 4;
rb -= 4;
}
PNG_UNUSED(prev)
}
void png_read_filter_row_avg3_sse2(png_row_infop row_info, png_bytep row,
png_const_bytep prev)
{
/* The Avg filter predicts each pixel as the (truncated) average of a and b.
* There's no pixel to the left of the first pixel. Luckily, it's
* predicted to be half of the pixel above it. So again, this works
* perfectly with our loop if we make sure a starts at zero.
*/
size_t rb;
const __m128i zero = _mm_setzero_si128();
__m128i b;
__m128i a, d = zero;
png_debug(1, "in png_read_filter_row_avg3_sse2");
rb = row_info->rowbytes;
while (rb >= 4) {
__m128i avg;
b = load4(prev);
a = d; d = load4(row );
/* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
avg = _mm_avg_epu8(a,b);
/* ...but we can fix it up by subtracting off 1 if it rounded up. */
avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
_mm_set1_epi8(1)));
d = _mm_add_epi8(d, avg);
store3(row, d);
prev += 3;
row += 3;
rb -= 3;
}
if (rb > 0) {
__m128i avg;
b = load3(prev);
a = d; d = load3(row );
/* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
avg = _mm_avg_epu8(a,b);
/* ...but we can fix it up by subtracting off 1 if it rounded up. */
avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
_mm_set1_epi8(1)));
d = _mm_add_epi8(d, avg);
store3(row, d);
prev += 3;
row += 3;
rb -= 3;
}
}
void png_read_filter_row_avg4_sse2(png_row_infop row_info, png_bytep row,
png_const_bytep prev)
{
/* The Avg filter predicts each pixel as the (truncated) average of a and b.
* There's no pixel to the left of the first pixel. Luckily, it's
* predicted to be half of the pixel above it. So again, this works
* perfectly with our loop if we make sure a starts at zero.
*/
size_t rb;
const __m128i zero = _mm_setzero_si128();
__m128i b;
__m128i a, d = zero;
png_debug(1, "in png_read_filter_row_avg4_sse2");
rb = row_info->rowbytes+4;
while (rb > 4) {
__m128i avg;
b = load4(prev);
a = d; d = load4(row );
/* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
avg = _mm_avg_epu8(a,b);
/* ...but we can fix it up by subtracting off 1 if it rounded up. */
avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
_mm_set1_epi8(1)));
d = _mm_add_epi8(d, avg);
store4(row, d);
prev += 4;
row += 4;
rb -= 4;
}
}
/* Returns |x| for 16-bit lanes. */
static __m128i abs_i16(__m128i x) {
#if PNG_INTEL_SSE_IMPLEMENTATION >= 2
return _mm_abs_epi16(x);
#else
/* Read this all as, return x<0 ? -x : x.
* To negate two's complement, you flip all the bits then add 1.
*/
__m128i is_negative = _mm_cmplt_epi16(x, _mm_setzero_si128());
/* Flip negative lanes. */
x = _mm_xor_si128(x, is_negative);
/* +1 to negative lanes, else +0. */
x = _mm_sub_epi16(x, is_negative);
return x;
#endif
}
/* Bytewise c ? t : e. */
static __m128i if_then_else(__m128i c, __m128i t, __m128i e) {
#if PNG_INTEL_SSE_IMPLEMENTATION >= 3
return _mm_blendv_epi8(e,t,c);
#else
return _mm_or_si128(_mm_and_si128(c, t), _mm_andnot_si128(c, e));
#endif
}
void png_read_filter_row_paeth3_sse2(png_row_infop row_info, png_bytep row,
png_const_bytep prev)
{
/* Paeth tries to predict pixel d using the pixel to the left of it, a,
* and two pixels from the previous row, b and c:
* prev: c b
* row: a d
* The Paeth function predicts d to be whichever of a, b, or c is nearest to
* p=a+b-c.
*
* The first pixel has no left context, and so uses an Up filter, p = b.
* This works naturally with our main loop's p = a+b-c if we force a and c
* to zero.
* Here we zero b and d, which become c and a respectively at the start of
* the loop.
*/
size_t rb;
const __m128i zero = _mm_setzero_si128();
__m128i c, b = zero,
a, d = zero;
png_debug(1, "in png_read_filter_row_paeth3_sse2");
rb = row_info->rowbytes;
while (rb >= 4) {
/* It's easiest to do this math (particularly, deal with pc) with 16-bit
* intermediates.
*/
__m128i pa,pb,pc,smallest,nearest;
c = b; b = _mm_unpacklo_epi8(load4(prev), zero);
a = d; d = _mm_unpacklo_epi8(load4(row ), zero);
/* (p-a) == (a+b-c - a) == (b-c) */
pa = _mm_sub_epi16(b,c);
/* (p-b) == (a+b-c - b) == (a-c) */
pb = _mm_sub_epi16(a,c);
/* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
pc = _mm_add_epi16(pa,pb);
pa = abs_i16(pa); /* |p-a| */
pb = abs_i16(pb); /* |p-b| */
pc = abs_i16(pc); /* |p-c| */
smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
/* Paeth breaks ties favoring a over b over c. */
nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
c));
/* Note `_epi8`: we need addition to wrap modulo 255. */
d = _mm_add_epi8(d, nearest);
store3(row, _mm_packus_epi16(d,d));
prev += 3;
row += 3;
rb -= 3;
}
if (rb > 0) {
/* It's easiest to do this math (particularly, deal with pc) with 16-bit
* intermediates.
*/
__m128i pa,pb,pc,smallest,nearest;
c = b; b = _mm_unpacklo_epi8(load3(prev), zero);
a = d; d = _mm_unpacklo_epi8(load3(row ), zero);
/* (p-a) == (a+b-c - a) == (b-c) */
pa = _mm_sub_epi16(b,c);
/* (p-b) == (a+b-c - b) == (a-c) */
pb = _mm_sub_epi16(a,c);
/* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
pc = _mm_add_epi16(pa,pb);
pa = abs_i16(pa); /* |p-a| */
pb = abs_i16(pb); /* |p-b| */
pc = abs_i16(pc); /* |p-c| */
smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
/* Paeth breaks ties favoring a over b over c. */
nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
c));
/* Note `_epi8`: we need addition to wrap modulo 255. */
d = _mm_add_epi8(d, nearest);
store3(row, _mm_packus_epi16(d,d));
prev += 3;
row += 3;
rb -= 3;
}
}
void png_read_filter_row_paeth4_sse2(png_row_infop row_info, png_bytep row,
png_const_bytep prev)
{
/* Paeth tries to predict pixel d using the pixel to the left of it, a,
* and two pixels from the previous row, b and c:
* prev: c b
* row: a d
* The Paeth function predicts d to be whichever of a, b, or c is nearest to
* p=a+b-c.
*
* The first pixel has no left context, and so uses an Up filter, p = b.
* This works naturally with our main loop's p = a+b-c if we force a and c
* to zero.
* Here we zero b and d, which become c and a respectively at the start of
* the loop.
*/
size_t rb;
const __m128i zero = _mm_setzero_si128();
__m128i pa,pb,pc,smallest,nearest;
__m128i c, b = zero,
a, d = zero;
png_debug(1, "in png_read_filter_row_paeth4_sse2");
rb = row_info->rowbytes+4;
while (rb > 4) {
/* It's easiest to do this math (particularly, deal with pc) with 16-bit
* intermediates.
*/
c = b; b = _mm_unpacklo_epi8(load4(prev), zero);
a = d; d = _mm_unpacklo_epi8(load4(row ), zero);
/* (p-a) == (a+b-c - a) == (b-c) */
pa = _mm_sub_epi16(b,c);
/* (p-b) == (a+b-c - b) == (a-c) */
pb = _mm_sub_epi16(a,c);
/* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
pc = _mm_add_epi16(pa,pb);
pa = abs_i16(pa); /* |p-a| */
pb = abs_i16(pb); /* |p-b| */
pc = abs_i16(pc); /* |p-c| */
smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
/* Paeth breaks ties favoring a over b over c. */
nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
c));
/* Note `_epi8`: we need addition to wrap modulo 255. */
d = _mm_add_epi8(d, nearest);
store4(row, _mm_packus_epi16(d,d));
prev += 4;
row += 4;
rb -= 4;
}
}
#endif /* PNG_INTEL_SSE_IMPLEMENTATION > 0 */
#endif /* READ */

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/* intel_init.c - SSE2 optimized filter functions
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2016-2017 Glenn Randers-Pehrson
* Written by Mike Klein and Matt Sarett, Google, Inc.
* Derived from arm/arm_init.c
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
#if PNG_INTEL_SSE_IMPLEMENTATION > 0
void
png_init_filter_functions_sse2(png_structp pp, unsigned int bpp)
{
/* The techniques used to implement each of these filters in SSE operate on
* one pixel at a time.
* So they generally speed up 3bpp images about 3x, 4bpp images about 4x.
* They can scale up to 6 and 8 bpp images and down to 2 bpp images,
* but they'd not likely have any benefit for 1bpp images.
* Most of these can be implemented using only MMX and 64-bit registers,
* but they end up a bit slower than using the equally-ubiquitous SSE2.
*/
png_debug(1, "in png_init_filter_functions_sse2");
if (bpp == 3)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_sse2;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_sse2;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth3_sse2;
}
else if (bpp == 4)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_sse2;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_sse2;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth4_sse2;
}
/* No need optimize PNG_FILTER_VALUE_UP. The compiler should
* autovectorize.
*/
}
#endif /* PNG_INTEL_SSE_IMPLEMENTATION > 0 */
#endif /* PNG_READ_SUPPORTED */

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/* pngdebug.h - Debugging macros for libpng, also used in pngtest.c
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2013 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* Define PNG_DEBUG at compile time for debugging information. Higher
* numbers for PNG_DEBUG mean more debugging information. This has
* only been added since version 0.95 so it is not implemented throughout
* libpng yet, but more support will be added as needed.
*
* png_debug[1-2]?(level, message ,arg{0-2})
* Expands to a statement (either a simple expression or a compound
* do..while(0) statement) that outputs a message with parameter
* substitution if PNG_DEBUG is defined to 2 or more. If PNG_DEBUG
* is undefined, 0 or 1 every png_debug expands to a simple expression
* (actually ((void)0)).
*
* level: level of detail of message, starting at 0. A level 'n'
* message is preceded by 'n' 3-space indentations (not implemented
* on Microsoft compilers unless PNG_DEBUG_FILE is also
* defined, to allow debug DLL compilation with no standard IO).
* message: a printf(3) style text string. A trailing '\n' is added
* to the message.
* arg: 0 to 2 arguments for printf(3) style substitution in message.
*/
#ifndef PNGDEBUG_H
#define PNGDEBUG_H
/* These settings control the formatting of messages in png.c and pngerror.c */
/* Moved to pngdebug.h at 1.5.0 */
# ifndef PNG_LITERAL_SHARP
# define PNG_LITERAL_SHARP 0x23
# endif
# ifndef PNG_LITERAL_LEFT_SQUARE_BRACKET
# define PNG_LITERAL_LEFT_SQUARE_BRACKET 0x5b
# endif
# ifndef PNG_LITERAL_RIGHT_SQUARE_BRACKET
# define PNG_LITERAL_RIGHT_SQUARE_BRACKET 0x5d
# endif
# ifndef PNG_STRING_NEWLINE
# define PNG_STRING_NEWLINE "\n"
# endif
#ifdef PNG_DEBUG
# if (PNG_DEBUG > 0)
# if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
# include <crtdbg.h>
# if (PNG_DEBUG > 1)
# ifndef _DEBUG
# define _DEBUG
# endif
# ifndef png_debug
# define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
# endif
# ifndef png_debug1
# define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
# endif
# ifndef png_debug2
# define png_debug2(l,m,p1,p2) \
_RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
# endif
# endif
# else /* PNG_DEBUG_FILE || !_MSC_VER */
# ifndef PNG_STDIO_SUPPORTED
# include <stdio.h> /* not included yet */
# endif
# ifndef PNG_DEBUG_FILE
# define PNG_DEBUG_FILE stderr
# endif /* PNG_DEBUG_FILE */
# if (PNG_DEBUG > 1)
# ifdef __STDC__
# ifndef png_debug
# define png_debug(l,m) \
do { \
int num_tabs=l; \
fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? " " : \
(num_tabs==2 ? " " : (num_tabs>2 ? " " : "")))); \
} while (0)
# endif
# ifndef png_debug1
# define png_debug1(l,m,p1) \
do { \
int num_tabs=l; \
fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? " " : \
(num_tabs==2 ? " " : (num_tabs>2 ? " " : ""))),p1); \
} while (0)
# endif
# ifndef png_debug2
# define png_debug2(l,m,p1,p2) \
do { \
int num_tabs=l; \
fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? " " : \
(num_tabs==2 ? " " : (num_tabs>2 ? " " : ""))),p1,p2);\
} while (0)
# endif
# else /* __STDC __ */
# ifndef png_debug
# define png_debug(l,m) \
do { \
int num_tabs=l; \
char format[256]; \
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
m,PNG_STRING_NEWLINE); \
fprintf(PNG_DEBUG_FILE,format); \
} while (0)
# endif
# ifndef png_debug1
# define png_debug1(l,m,p1) \
do { \
int num_tabs=l; \
char format[256]; \
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
m,PNG_STRING_NEWLINE); \
fprintf(PNG_DEBUG_FILE,format,p1); \
} while (0)
# endif
# ifndef png_debug2
# define png_debug2(l,m,p1,p2) \
do { \
int num_tabs=l; \
char format[256]; \
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
m,PNG_STRING_NEWLINE); \
fprintf(PNG_DEBUG_FILE,format,p1,p2); \
} while (0)
# endif
# endif /* __STDC __ */
# endif /* (PNG_DEBUG > 1) */
# endif /* _MSC_VER */
# endif /* (PNG_DEBUG > 0) */
#endif /* PNG_DEBUG */
#ifndef png_debug
# define png_debug(l, m) ((void)0)
#endif
#ifndef png_debug1
# define png_debug1(l, m, p1) ((void)0)
#endif
#ifndef png_debug2
# define png_debug2(l, m, p1, p2) ((void)0)
#endif
#endif /* PNGDEBUG_H */

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/* pngerror.c - stub functions for i/o and memory allocation
*
* Copyright (c) 2018-2024 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* This file provides a location for all error handling. Users who
* need special error handling are expected to write replacement functions
* and use png_set_error_fn() to use those functions. See the instructions
* at each function.
*/
#include "pngpriv.h"
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
static PNG_FUNCTION(void, png_default_error,PNGARG((png_const_structrp png_ptr,
png_const_charp error_message)),PNG_NORETURN);
#ifdef PNG_WARNINGS_SUPPORTED
static void /* PRIVATE */
png_default_warning PNGARG((png_const_structrp png_ptr,
png_const_charp warning_message));
#endif /* WARNINGS */
/* This function is called whenever there is a fatal error. This function
* should not be changed. If there is a need to handle errors differently,
* you should supply a replacement error function and use png_set_error_fn()
* to replace the error function at run-time.
*/
#ifdef PNG_ERROR_TEXT_SUPPORTED
PNG_FUNCTION(void,PNGAPI
png_error,(png_const_structrp png_ptr, png_const_charp error_message),
PNG_NORETURN)
{
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
char msg[16];
if (png_ptr != NULL)
{
if ((png_ptr->flags &
(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
{
if (*error_message == PNG_LITERAL_SHARP)
{
/* Strip "#nnnn " from beginning of error message. */
int offset;
for (offset = 1; offset<15; offset++)
if (error_message[offset] == ' ')
break;
if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
{
int i;
for (i = 0; i < offset - 1; i++)
msg[i] = error_message[i + 1];
msg[i - 1] = '\0';
error_message = msg;
}
else
error_message += offset;
}
else
{
if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
{
msg[0] = '0';
msg[1] = '\0';
error_message = msg;
}
}
}
}
#endif
if (png_ptr != NULL && png_ptr->error_fn != NULL)
(*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr),
error_message);
/* If the custom handler doesn't exist, or if it returns,
use the default handler, which will not return. */
png_default_error(png_ptr, error_message);
}
#else
PNG_FUNCTION(void,PNGAPI
png_err,(png_const_structrp png_ptr),PNG_NORETURN)
{
/* Prior to 1.5.2 the error_fn received a NULL pointer, expressed
* erroneously as '\0', instead of the empty string "". This was
* apparently an error, introduced in libpng-1.2.20, and png_default_error
* will crash in this case.
*/
if (png_ptr != NULL && png_ptr->error_fn != NULL)
(*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), "");
/* If the custom handler doesn't exist, or if it returns,
use the default handler, which will not return. */
png_default_error(png_ptr, "");
}
#endif /* ERROR_TEXT */
/* Utility to safely appends strings to a buffer. This never errors out so
* error checking is not required in the caller.
*/
size_t
png_safecat(png_charp buffer, size_t bufsize, size_t pos,
png_const_charp string)
{
if (buffer != NULL && pos < bufsize)
{
if (string != NULL)
while (*string != '\0' && pos < bufsize-1)
buffer[pos++] = *string++;
buffer[pos] = '\0';
}
return pos;
}
#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
/* Utility to dump an unsigned value into a buffer, given a start pointer and
* and end pointer (which should point just *beyond* the end of the buffer!)
* Returns the pointer to the start of the formatted string.
*/
png_charp
png_format_number(png_const_charp start, png_charp end, int format,
png_alloc_size_t number)
{
int count = 0; /* number of digits output */
int mincount = 1; /* minimum number required */
int output = 0; /* digit output (for the fixed point format) */
*--end = '\0';
/* This is written so that the loop always runs at least once, even with
* number zero.
*/
while (end > start && (number != 0 || count < mincount))
{
static const char digits[] = "0123456789ABCDEF";
switch (format)
{
case PNG_NUMBER_FORMAT_fixed:
/* Needs five digits (the fraction) */
mincount = 5;
if (output != 0 || number % 10 != 0)
{
*--end = digits[number % 10];
output = 1;
}
number /= 10;
break;
case PNG_NUMBER_FORMAT_02u:
/* Expects at least 2 digits. */
mincount = 2;
/* FALLTHROUGH */
case PNG_NUMBER_FORMAT_u:
*--end = digits[number % 10];
number /= 10;
break;
case PNG_NUMBER_FORMAT_02x:
/* This format expects at least two digits */
mincount = 2;
/* FALLTHROUGH */
case PNG_NUMBER_FORMAT_x:
*--end = digits[number & 0xf];
number >>= 4;
break;
default: /* an error */
number = 0;
break;
}
/* Keep track of the number of digits added */
++count;
/* Float a fixed number here: */
if ((format == PNG_NUMBER_FORMAT_fixed) && (count == 5) && (end > start))
{
/* End of the fraction, but maybe nothing was output? In that case
* drop the decimal point. If the number is a true zero handle that
* here.
*/
if (output != 0)
*--end = '.';
else if (number == 0) /* and !output */
*--end = '0';
}
}
return end;
}
#endif
#ifdef PNG_WARNINGS_SUPPORTED
/* This function is called whenever there is a non-fatal error. This function
* should not be changed. If there is a need to handle warnings differently,
* you should supply a replacement warning function and use
* png_set_error_fn() to replace the warning function at run-time.
*/
void PNGAPI
png_warning(png_const_structrp png_ptr, png_const_charp warning_message)
{
int offset = 0;
if (png_ptr != NULL)
{
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
if ((png_ptr->flags &
(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
#endif
{
if (*warning_message == PNG_LITERAL_SHARP)
{
for (offset = 1; offset < 15; offset++)
if (warning_message[offset] == ' ')
break;
}
}
}
if (png_ptr != NULL && png_ptr->warning_fn != NULL)
(*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr),
warning_message + offset);
else
png_default_warning(png_ptr, warning_message + offset);
}
/* These functions support 'formatted' warning messages with up to
* PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter
* is introduced by @<number>, where 'number' starts at 1. This follows the
* standard established by X/Open for internationalizable error messages.
*/
void
png_warning_parameter(png_warning_parameters p, int number,
png_const_charp string)
{
if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
(void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
}
void
png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
png_alloc_size_t value)
{
char buffer[PNG_NUMBER_BUFFER_SIZE] = {0};
png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
}
void
png_warning_parameter_signed(png_warning_parameters p, int number, int format,
png_int_32 value)
{
png_alloc_size_t u;
png_charp str;
char buffer[PNG_NUMBER_BUFFER_SIZE] = {0};
/* Avoid overflow by doing the negate in a png_alloc_size_t: */
u = (png_alloc_size_t)value;
if (value < 0)
u = ~u + 1;
str = PNG_FORMAT_NUMBER(buffer, format, u);
if (value < 0 && str > buffer)
*--str = '-';
png_warning_parameter(p, number, str);
}
void
png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p,
png_const_charp message)
{
/* The internal buffer is just 192 bytes - enough for all our messages,
* overflow doesn't happen because this code checks! If someone figures
* out how to send us a message longer than 192 bytes, all that will
* happen is that the message will be truncated appropriately.
*/
size_t i = 0; /* Index in the msg[] buffer: */
char msg[192];
/* Each iteration through the following loop writes at most one character
* to msg[i++] then returns here to validate that there is still space for
* the trailing '\0'. It may (in the case of a parameter) read more than
* one character from message[]; it must check for '\0' and continue to the
* test if it finds the end of string.
*/
while (i<(sizeof msg)-1 && *message != '\0')
{
/* '@' at end of string is now just printed (previously it was skipped);
* it is an error in the calling code to terminate the string with @.
*/
if (p != NULL && *message == '@' && message[1] != '\0')
{
int parameter_char = *++message; /* Consume the '@' */
static const char valid_parameters[] = "123456789";
int parameter = 0;
/* Search for the parameter digit, the index in the string is the
* parameter to use.
*/
while (valid_parameters[parameter] != parameter_char &&
valid_parameters[parameter] != '\0')
++parameter;
/* If the parameter digit is out of range it will just get printed. */
if (parameter < PNG_WARNING_PARAMETER_COUNT)
{
/* Append this parameter */
png_const_charp parm = p[parameter];
png_const_charp pend = p[parameter] + (sizeof p[parameter]);
/* No need to copy the trailing '\0' here, but there is no guarantee
* that parm[] has been initialized, so there is no guarantee of a
* trailing '\0':
*/
while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend)
msg[i++] = *parm++;
/* Consume the parameter digit too: */
++message;
continue;
}
/* else not a parameter and there is a character after the @ sign; just
* copy that. This is known not to be '\0' because of the test above.
*/
}
/* At this point *message can't be '\0', even in the bad parameter case
* above where there is a lone '@' at the end of the message string.
*/
msg[i++] = *message++;
}
/* i is always less than (sizeof msg), so: */
msg[i] = '\0';
/* And this is the formatted message. It may be larger than
* PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these
* are not (currently) formatted.
*/
png_warning(png_ptr, msg);
}
#endif /* WARNINGS */
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
void PNGAPI
png_benign_error(png_const_structrp png_ptr, png_const_charp error_message)
{
if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
{
# ifdef PNG_READ_SUPPORTED
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
png_ptr->chunk_name != 0)
png_chunk_warning(png_ptr, error_message);
else
# endif
png_warning(png_ptr, error_message);
}
else
{
# ifdef PNG_READ_SUPPORTED
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
png_ptr->chunk_name != 0)
png_chunk_error(png_ptr, error_message);
else
# endif
png_error(png_ptr, error_message);
}
# ifndef PNG_ERROR_TEXT_SUPPORTED
PNG_UNUSED(error_message)
# endif
}
void /* PRIVATE */
png_app_warning(png_const_structrp png_ptr, png_const_charp error_message)
{
if ((png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) != 0)
png_warning(png_ptr, error_message);
else
png_error(png_ptr, error_message);
# ifndef PNG_ERROR_TEXT_SUPPORTED
PNG_UNUSED(error_message)
# endif
}
void /* PRIVATE */
png_app_error(png_const_structrp png_ptr, png_const_charp error_message)
{
if ((png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN) != 0)
png_warning(png_ptr, error_message);
else
png_error(png_ptr, error_message);
# ifndef PNG_ERROR_TEXT_SUPPORTED
PNG_UNUSED(error_message)
# endif
}
#endif /* BENIGN_ERRORS */
#define PNG_MAX_ERROR_TEXT 196 /* Currently limited by profile_error in png.c */
#if defined(PNG_WARNINGS_SUPPORTED) || \
(defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED))
/* These utilities are used internally to build an error message that relates
* to the current chunk. The chunk name comes from png_ptr->chunk_name,
* which is used to prefix the message. The message is limited in length
* to 63 bytes. The name characters are output as hex digits wrapped in []
* if the character is invalid.
*/
#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
static const char png_digit[16] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'
};
static void /* PRIVATE */
png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp
error_message)
{
png_uint_32 chunk_name = png_ptr->chunk_name;
int iout = 0, ishift = 24;
while (ishift >= 0)
{
int c = (int)(chunk_name >> ishift) & 0xff;
ishift -= 8;
if (isnonalpha(c) != 0)
{
buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
buffer[iout++] = png_digit[(c & 0xf0) >> 4];
buffer[iout++] = png_digit[c & 0x0f];
buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
}
else
{
buffer[iout++] = (char)c;
}
}
if (error_message == NULL)
buffer[iout] = '\0';
else
{
int iin = 0;
buffer[iout++] = ':';
buffer[iout++] = ' ';
while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
buffer[iout++] = error_message[iin++];
/* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
buffer[iout] = '\0';
}
}
#endif /* WARNINGS || ERROR_TEXT */
#if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
PNG_FUNCTION(void,PNGAPI
png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message),
PNG_NORETURN)
{
char msg[18+PNG_MAX_ERROR_TEXT];
if (png_ptr == NULL)
png_error(png_ptr, error_message);
else
{
png_format_buffer(png_ptr, msg, error_message);
png_error(png_ptr, msg);
}
}
#endif /* READ && ERROR_TEXT */
#ifdef PNG_WARNINGS_SUPPORTED
void PNGAPI
png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message)
{
char msg[18+PNG_MAX_ERROR_TEXT];
if (png_ptr == NULL)
png_warning(png_ptr, warning_message);
else
{
png_format_buffer(png_ptr, msg, warning_message);
png_warning(png_ptr, msg);
}
}
#endif /* WARNINGS */
#ifdef PNG_READ_SUPPORTED
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
void PNGAPI
png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp
error_message)
{
if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
png_chunk_warning(png_ptr, error_message);
else
png_chunk_error(png_ptr, error_message);
# ifndef PNG_ERROR_TEXT_SUPPORTED
PNG_UNUSED(error_message)
# endif
}
#endif
#endif /* READ */
void /* PRIVATE */
png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error)
{
# ifndef PNG_WARNINGS_SUPPORTED
PNG_UNUSED(message)
# endif
/* This is always supported, but for just read or just write it
* unconditionally does the right thing.
*/
# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
# endif
# ifdef PNG_READ_SUPPORTED
{
if (error < PNG_CHUNK_ERROR)
png_chunk_warning(png_ptr, message);
else
png_chunk_benign_error(png_ptr, message);
}
# endif
# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
else if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
# endif
# ifdef PNG_WRITE_SUPPORTED
{
if (error < PNG_CHUNK_WRITE_ERROR)
png_app_warning(png_ptr, message);
else
png_app_error(png_ptr, message);
}
# endif
}
#ifdef PNG_ERROR_TEXT_SUPPORTED
#ifdef PNG_FLOATING_POINT_SUPPORTED
PNG_FUNCTION(void,
png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN)
{
# define fixed_message "fixed point overflow in "
# define fixed_message_ln ((sizeof fixed_message)-1)
unsigned int iin;
char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
memcpy(msg, fixed_message, fixed_message_ln);
iin = 0;
if (name != NULL)
while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
{
msg[fixed_message_ln + iin] = name[iin];
++iin;
}
msg[fixed_message_ln + iin] = 0;
png_error(png_ptr, msg);
}
#endif
#endif
#ifdef PNG_SETJMP_SUPPORTED
/* This API only exists if ANSI-C style error handling is used,
* otherwise it is necessary for png_default_error to be overridden.
*/
jmp_buf* PNGAPI
png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn,
size_t jmp_buf_size)
{
/* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value
* and it must not change after that. Libpng doesn't care how big the
* buffer is, just that it doesn't change.
*
* If the buffer size is no *larger* than the size of jmp_buf when libpng is
* compiled a built in jmp_buf is returned; this preserves the pre-1.6.0
* semantics that this call will not fail. If the size is larger, however,
* the buffer is allocated and this may fail, causing the function to return
* NULL.
*/
if (png_ptr == NULL)
return NULL;
if (png_ptr->jmp_buf_ptr == NULL)
{
png_ptr->jmp_buf_size = 0; /* not allocated */
if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local))
png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local;
else
{
png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *,
png_malloc_warn(png_ptr, jmp_buf_size));
if (png_ptr->jmp_buf_ptr == NULL)
return NULL; /* new NULL return on OOM */
png_ptr->jmp_buf_size = jmp_buf_size;
}
}
else /* Already allocated: check the size */
{
size_t size = png_ptr->jmp_buf_size;
if (size == 0)
{
size = (sizeof png_ptr->jmp_buf_local);
if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local)
{
/* This is an internal error in libpng: somehow we have been left
* with a stack allocated jmp_buf when the application regained
* control. It's always possible to fix this up, but for the moment
* this is a png_error because that makes it easy to detect.
*/
png_error(png_ptr, "Libpng jmp_buf still allocated");
/* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */
}
}
if (size != jmp_buf_size)
{
png_warning(png_ptr, "Application jmp_buf size changed");
return NULL; /* caller will probably crash: no choice here */
}
}
/* Finally fill in the function, now we have a satisfactory buffer. It is
* valid to change the function on every call.
*/
png_ptr->longjmp_fn = longjmp_fn;
return png_ptr->jmp_buf_ptr;
}
void /* PRIVATE */
png_free_jmpbuf(png_structrp png_ptr)
{
if (png_ptr != NULL)
{
jmp_buf *jb = png_ptr->jmp_buf_ptr;
/* A size of 0 is used to indicate a local, stack, allocation of the
* pointer; used here and in png.c
*/
if (jb != NULL && png_ptr->jmp_buf_size > 0)
{
/* This stuff is so that a failure to free the error control structure
* does not leave libpng in a state with no valid error handling: the
* free always succeeds, if there is an error it gets ignored.
*/
if (jb != &png_ptr->jmp_buf_local)
{
/* Make an internal, libpng, jmp_buf to return here */
jmp_buf free_jmp_buf;
if (!setjmp(free_jmp_buf))
{
png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */
png_ptr->jmp_buf_size = 0; /* stack allocation */
png_ptr->longjmp_fn = longjmp;
png_free(png_ptr, jb); /* Return to setjmp on error */
}
}
}
/* *Always* cancel everything out: */
png_ptr->jmp_buf_size = 0;
png_ptr->jmp_buf_ptr = NULL;
png_ptr->longjmp_fn = 0;
}
}
#endif
/* This is the default error handling function. Note that replacements for
* this function MUST NOT RETURN, or the program will likely crash. This
* function is used by default, or if the program supplies NULL for the
* error function pointer in png_set_error_fn().
*/
static PNG_FUNCTION(void /* PRIVATE */,
png_default_error,(png_const_structrp png_ptr, png_const_charp error_message),
PNG_NORETURN)
{
#ifdef PNG_CONSOLE_IO_SUPPORTED
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
/* Check on NULL only added in 1.5.4 */
if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
{
/* Strip "#nnnn " from beginning of error message. */
int offset;
char error_number[16];
for (offset = 0; offset<15; offset++)
{
error_number[offset] = error_message[offset + 1];
if (error_message[offset] == ' ')
break;
}
if ((offset > 1) && (offset < 15))
{
error_number[offset - 1] = '\0';
fprintf(stderr, "libpng error no. %s: %s",
error_number, error_message + offset + 1);
fprintf(stderr, PNG_STRING_NEWLINE);
}
else
{
fprintf(stderr, "libpng error: %s, offset=%d",
error_message, offset);
fprintf(stderr, PNG_STRING_NEWLINE);
}
}
else
#endif
{
fprintf(stderr, "libpng error: %s", error_message ? error_message :
"undefined");
fprintf(stderr, PNG_STRING_NEWLINE);
}
#else
PNG_UNUSED(error_message) /* Make compiler happy */
#endif
png_longjmp(png_ptr, 1);
}
PNG_FUNCTION(void,PNGAPI
png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN)
{
#ifdef PNG_SETJMP_SUPPORTED
if (png_ptr != NULL && png_ptr->longjmp_fn != NULL &&
png_ptr->jmp_buf_ptr != NULL)
png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val);
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(val)
#endif
/* If control reaches this point, png_longjmp() must not return. The only
* choice is to terminate the whole process (or maybe the thread); to do
* this the ANSI-C abort() function is used unless a different method is
* implemented by overriding the default configuration setting for
* PNG_ABORT().
*/
PNG_ABORT();
}
#ifdef PNG_WARNINGS_SUPPORTED
/* This function is called when there is a warning, but the library thinks
* it can continue anyway. Replacement functions don't have to do anything
* here if you don't want them to. In the default configuration, png_ptr is
* not used, but it is passed in case it may be useful.
*/
static void /* PRIVATE */
png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message)
{
#ifdef PNG_CONSOLE_IO_SUPPORTED
# ifdef PNG_ERROR_NUMBERS_SUPPORTED
if (*warning_message == PNG_LITERAL_SHARP)
{
int offset;
char warning_number[16];
for (offset = 0; offset < 15; offset++)
{
warning_number[offset] = warning_message[offset + 1];
if (warning_message[offset] == ' ')
break;
}
if ((offset > 1) && (offset < 15))
{
warning_number[offset + 1] = '\0';
fprintf(stderr, "libpng warning no. %s: %s",
warning_number, warning_message + offset);
fprintf(stderr, PNG_STRING_NEWLINE);
}
else
{
fprintf(stderr, "libpng warning: %s",
warning_message);
fprintf(stderr, PNG_STRING_NEWLINE);
}
}
else
# endif
{
fprintf(stderr, "libpng warning: %s", warning_message);
fprintf(stderr, PNG_STRING_NEWLINE);
}
#else
PNG_UNUSED(warning_message) /* Make compiler happy */
#endif
PNG_UNUSED(png_ptr) /* Make compiler happy */
}
#endif /* WARNINGS */
/* This function is called when the application wants to use another method
* of handling errors and warnings. Note that the error function MUST NOT
* return to the calling routine or serious problems will occur. The return
* method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1)
*/
void PNGAPI
png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warning_fn)
{
if (png_ptr == NULL)
return;
png_ptr->error_ptr = error_ptr;
png_ptr->error_fn = error_fn;
#ifdef PNG_WARNINGS_SUPPORTED
png_ptr->warning_fn = warning_fn;
#else
PNG_UNUSED(warning_fn)
#endif
}
/* This function returns a pointer to the error_ptr associated with the user
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
png_voidp PNGAPI
png_get_error_ptr(png_const_structrp png_ptr)
{
if (png_ptr == NULL)
return NULL;
return (png_voidp)png_ptr->error_ptr;
}
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
void PNGAPI
png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode)
{
if (png_ptr != NULL)
{
png_ptr->flags &=
((~(PNG_FLAG_STRIP_ERROR_NUMBERS |
PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
}
}
#endif
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
/* Currently the above both depend on SETJMP_SUPPORTED, however it would be
* possible to implement without setjmp support just so long as there is some
* way to handle the error return here:
*/
PNG_FUNCTION(void /* PRIVATE */, (PNGCBAPI
png_safe_error),(png_structp png_nonconst_ptr, png_const_charp error_message),
PNG_NORETURN)
{
png_const_structrp png_ptr = png_nonconst_ptr;
png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
/* An error is always logged here, overwriting anything (typically a warning)
* that is already there:
*/
if (image != NULL)
{
png_safecat(image->message, (sizeof image->message), 0, error_message);
image->warning_or_error |= PNG_IMAGE_ERROR;
/* Retrieve the jmp_buf from within the png_control, making this work for
* C++ compilation too is pretty tricky: C++ wants a pointer to the first
* element of a jmp_buf, but C doesn't tell us the type of that.
*/
if (image->opaque != NULL && image->opaque->error_buf != NULL)
longjmp(png_control_jmp_buf(image->opaque), 1);
/* Missing longjmp buffer, the following is to help debugging: */
{
size_t pos = png_safecat(image->message, (sizeof image->message), 0,
"bad longjmp: ");
png_safecat(image->message, (sizeof image->message), pos,
error_message);
}
}
/* Here on an internal programming error. */
abort();
}
#ifdef PNG_WARNINGS_SUPPORTED
void /* PRIVATE */ PNGCBAPI
png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message)
{
png_const_structrp png_ptr = png_nonconst_ptr;
png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
/* A warning is only logged if there is no prior warning or error. */
if (image->warning_or_error == 0)
{
png_safecat(image->message, (sizeof image->message), 0, warning_message);
image->warning_or_error |= PNG_IMAGE_WARNING;
}
}
#endif
int /* PRIVATE */
png_safe_execute(png_imagep image, int (*function)(png_voidp), png_voidp arg)
{
png_voidp saved_error_buf = image->opaque->error_buf;
jmp_buf safe_jmpbuf;
int result;
/* Safely execute function(arg), with png_error returning back here. */
if (setjmp(safe_jmpbuf) == 0)
{
image->opaque->error_buf = safe_jmpbuf;
result = function(arg);
image->opaque->error_buf = saved_error_buf;
return result;
}
/* On png_error, return via longjmp, pop the jmpbuf, and free the image. */
image->opaque->error_buf = saved_error_buf;
png_image_free(image);
return 0;
}
#endif /* SIMPLIFIED READ || SIMPLIFIED_WRITE */
#endif /* READ || WRITE */

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/* pnginfo.h - header file for PNG reference library
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2013,2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* png_info is a structure that holds the information in a PNG file so
* that the application can find out the characteristics of the image.
* If you are reading the file, this structure will tell you what is
* in the PNG file. If you are writing the file, fill in the information
* you want to put into the PNG file, using png_set_*() functions, then
* call png_write_info().
*
* The names chosen should be very close to the PNG specification, so
* consult that document for information about the meaning of each field.
*
* With libpng < 0.95, it was only possible to directly set and read the
* the values in the png_info_struct, which meant that the contents and
* order of the values had to remain fixed. With libpng 0.95 and later,
* however, there are now functions that abstract the contents of
* png_info_struct from the application, so this makes it easier to use
* libpng with dynamic libraries, and even makes it possible to use
* libraries that don't have all of the libpng ancillary chunk-handing
* functionality. In libpng-1.5.0 this was moved into a separate private
* file that is not visible to applications.
*
* The following members may have allocated storage attached that should be
* cleaned up before the structure is discarded: palette, trans, text,
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
* are automatically freed when the info structure is deallocated, if they were
* allocated internally by libpng. This behavior can be changed by means
* of the png_data_freer() function.
*
* More allocation details: all the chunk-reading functions that
* change these members go through the corresponding png_set_*
* functions. A function to clear these members is available: see
* png_free_data(). The png_set_* functions do not depend on being
* able to point info structure members to any of the storage they are
* passed (they make their own copies), EXCEPT that the png_set_text
* functions use the same storage passed to them in the text_ptr or
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
* functions do not make their own copies.
*/
#ifndef PNGINFO_H
#define PNGINFO_H
struct png_info_def
{
/* The following are necessary for every PNG file */
png_uint_32 width; /* width of image in pixels (from IHDR) */
png_uint_32 height; /* height of image in pixels (from IHDR) */
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
size_t rowbytes; /* bytes needed to hold an untransformed row */
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
/* The following three should have been named *_method not *_type */
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
/* The following are set by png_set_IHDR, called from the application on
* write, but the are never actually used by the write code.
*/
png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
png_byte pixel_depth; /* number of bits per pixel */
png_byte spare_byte; /* to align the data, and for future use */
#ifdef PNG_READ_SUPPORTED
/* This is never set during write */
png_byte signature[8]; /* magic bytes read by libpng from start of file */
#endif
/* The rest of the data is optional. If you are reading, check the
* valid field to see if the information in these are valid. If you
* are writing, set the valid field to those chunks you want written,
* and initialize the appropriate fields below.
*/
#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
/* png_colorspace only contains 'flags' if neither GAMMA or COLORSPACE are
* defined. When COLORSPACE is switched on all the colorspace-defining
* chunks should be enabled, when GAMMA is switched on all the gamma-defining
* chunks should be enabled. If this is not done it becomes possible to read
* inconsistent PNG files and assign a probably incorrect interpretation to
* the information. (In other words, by carefully choosing which chunks to
* recognize the system configuration can select an interpretation for PNG
* files containing ambiguous data and this will result in inconsistent
* behavior between different libpng builds!)
*/
png_colorspace colorspace;
#endif
#ifdef PNG_iCCP_SUPPORTED
/* iCCP chunk data. */
png_charp iccp_name; /* profile name */
png_bytep iccp_profile; /* International Color Consortium profile data */
png_uint_32 iccp_proflen; /* ICC profile data length */
#endif
#ifdef PNG_TEXT_SUPPORTED
/* The tEXt, and zTXt chunks contain human-readable textual data in
* uncompressed, compressed, and optionally compressed forms, respectively.
* The data in "text" is an array of pointers to uncompressed,
* null-terminated C strings. Each chunk has a keyword that describes the
* textual data contained in that chunk. Keywords are not required to be
* unique, and the text string may be empty. Any number of text chunks may
* be in an image.
*/
int num_text; /* number of comments read or comments to write */
int max_text; /* current size of text array */
png_textp text; /* array of comments read or comments to write */
#endif /* TEXT */
#ifdef PNG_tIME_SUPPORTED
/* The tIME chunk holds the last time the displayed image data was
* modified. See the png_time struct for the contents of this struct.
*/
png_time mod_time;
#endif
#ifdef PNG_sBIT_SUPPORTED
/* The sBIT chunk specifies the number of significant high-order bits
* in the pixel data. Values are in the range [1, bit_depth], and are
* only specified for the channels in the pixel data. The contents of
* the low-order bits is not specified. Data is valid if
* (valid & PNG_INFO_sBIT) is non-zero.
*/
png_color_8 sig_bit; /* significant bits in color channels */
#endif
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
defined(PNG_READ_BACKGROUND_SUPPORTED)
/* The tRNS chunk supplies transparency data for paletted images and
* other image types that don't need a full alpha channel. There are
* "num_trans" transparency values for a paletted image, stored in the
* same order as the palette colors, starting from index 0. Values
* for the data are in the range [0, 255], ranging from fully transparent
* to fully opaque, respectively. For non-paletted images, there is a
* single color specified that should be treated as fully transparent.
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
*/
png_bytep trans_alpha; /* alpha values for paletted image */
png_color_16 trans_color; /* transparent color for non-palette image */
#endif
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
/* The bKGD chunk gives the suggested image background color if the
* display program does not have its own background color and the image
* is needs to composited onto a background before display. The colors
* in "background" are normally in the same color space/depth as the
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
*/
png_color_16 background;
#endif
#ifdef PNG_oFFs_SUPPORTED
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
* and downwards from the top-left corner of the display, page, or other
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
*/
png_int_32 x_offset; /* x offset on page */
png_int_32 y_offset; /* y offset on page */
png_byte offset_unit_type; /* offset units type */
#endif
#ifdef PNG_pHYs_SUPPORTED
/* The pHYs chunk gives the physical pixel density of the image for
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
*/
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
#endif
#ifdef PNG_eXIf_SUPPORTED
int num_exif; /* Added at libpng-1.6.31 */
png_bytep exif;
# ifdef PNG_READ_eXIf_SUPPORTED
png_bytep eXIf_buf; /* Added at libpng-1.6.32 */
# endif
#endif
#ifdef PNG_hIST_SUPPORTED
/* The hIST chunk contains the relative frequency or importance of the
* various palette entries, so that a viewer can intelligently select a
* reduced-color palette, if required. Data is an array of "num_palette"
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
* is non-zero.
*/
png_uint_16p hist;
#endif
#ifdef PNG_pCAL_SUPPORTED
/* The pCAL chunk describes a transformation between the stored pixel
* values and original physical data values used to create the image.
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
* range given by [pcal_X0, pcal_X1], and are further transformed by a
* (possibly non-linear) transformation function given by "pcal_type"
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
* defines below, and the PNG-Group's PNG extensions document for a
* complete description of the transformations and how they should be
* implemented, and for a description of the ASCII parameter strings.
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
*/
png_charp pcal_purpose; /* pCAL chunk description string */
png_int_32 pcal_X0; /* minimum value */
png_int_32 pcal_X1; /* maximum value */
png_charp pcal_units; /* Latin-1 string giving physical units */
png_charpp pcal_params; /* ASCII strings containing parameter values */
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
png_byte pcal_nparams; /* number of parameters given in pcal_params */
#endif
/* New members added in libpng-1.0.6 */
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
/* Storage for unknown chunks that the library doesn't recognize. */
png_unknown_chunkp unknown_chunks;
/* The type of this field is limited by the type of
* png_struct::user_chunk_cache_max, else overflow can occur.
*/
int unknown_chunks_num;
#endif
#ifdef PNG_sPLT_SUPPORTED
/* Data on sPLT chunks (there may be more than one). */
png_sPLT_tp splt_palettes;
int splt_palettes_num; /* Match type returned by png_get API */
#endif
#ifdef PNG_sCAL_SUPPORTED
/* The sCAL chunk describes the actual physical dimensions of the
* subject matter of the graphic. The chunk contains a unit specification
* a byte value, and two ASCII strings representing floating-point
* values. The values are width and height corresponding to one pixel
* in the image. Data values are valid if (valid & PNG_INFO_sCAL) is
* non-zero.
*/
png_byte scal_unit; /* unit of physical scale */
png_charp scal_s_width; /* string containing height */
png_charp scal_s_height; /* string containing width */
#endif
#ifdef PNG_INFO_IMAGE_SUPPORTED
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
non-zero */
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
png_bytepp row_pointers; /* the image bits */
#endif
};
#endif /* PNGINFO_H */

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/* pngmem.c - stub functions for memory allocation
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* This file provides a location for all memory allocation. Users who
* need special memory handling are expected to supply replacement
* functions for png_malloc() and png_free(), and to use
* png_create_read_struct_2() and png_create_write_struct_2() to
* identify the replacement functions.
*/
#include "pngpriv.h"
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
/* Free a png_struct */
void /* PRIVATE */
png_destroy_png_struct(png_structrp png_ptr)
{
if (png_ptr != NULL)
{
/* png_free might call png_error and may certainly call
* png_get_mem_ptr, so fake a temporary png_struct to support this.
*/
png_struct dummy_struct = *png_ptr;
memset(png_ptr, 0, (sizeof *png_ptr));
png_free(&dummy_struct, png_ptr);
# ifdef PNG_SETJMP_SUPPORTED
/* We may have a jmp_buf left to deallocate. */
png_free_jmpbuf(&dummy_struct);
# endif
}
}
/* Allocate memory. For reasonable files, size should never exceed
* 64K. However, zlib may allocate more than 64K if you don't tell
* it not to. See zconf.h and png.h for more information. zlib does
* need to allocate exactly 64K, so whatever you call here must
* have the ability to do that.
*/
PNG_FUNCTION(png_voidp,PNGAPI
png_calloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
{
png_voidp ret;
ret = png_malloc(png_ptr, size);
if (ret != NULL)
memset(ret, 0, size);
return ret;
}
/* png_malloc_base, an internal function added at libpng 1.6.0, does the work of
* allocating memory, taking into account limits and PNG_USER_MEM_SUPPORTED.
* Checking and error handling must happen outside this routine; it returns NULL
* if the allocation cannot be done (for any reason.)
*/
PNG_FUNCTION(png_voidp /* PRIVATE */,
png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size),
PNG_ALLOCATED)
{
/* Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS
* allocators have also been removed in 1.6.0, so any 16-bit system now has
* to implement a user memory handler. This checks to be sure it isn't
* called with big numbers.
*/
#ifndef PNG_USER_MEM_SUPPORTED
PNG_UNUSED(png_ptr)
#endif
/* Some compilers complain that this is always true. However, it
* can be false when integer overflow happens.
*/
if (size > 0 && size <= PNG_SIZE_MAX
# ifdef PNG_MAX_MALLOC_64K
&& size <= 65536U
# endif
)
{
#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr != NULL && png_ptr->malloc_fn != NULL)
return png_ptr->malloc_fn(png_constcast(png_structrp,png_ptr), size);
else
#endif
return malloc((size_t)size); /* checked for truncation above */
}
else
return NULL;
}
#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
/* This is really here only to work round a spurious warning in GCC 4.6 and 4.7
* that arises because of the checks in png_realloc_array that are repeated in
* png_malloc_array.
*/
static png_voidp
png_malloc_array_checked(png_const_structrp png_ptr, int nelements,
size_t element_size)
{
png_alloc_size_t req = (png_alloc_size_t)nelements; /* known to be > 0 */
if (req <= PNG_SIZE_MAX/element_size)
return png_malloc_base(png_ptr, req * element_size);
/* The failure case when the request is too large */
return NULL;
}
PNG_FUNCTION(png_voidp /* PRIVATE */,
png_malloc_array,(png_const_structrp png_ptr, int nelements,
size_t element_size),PNG_ALLOCATED)
{
if (nelements <= 0 || element_size == 0)
png_error(png_ptr, "internal error: array alloc");
return png_malloc_array_checked(png_ptr, nelements, element_size);
}
PNG_FUNCTION(png_voidp /* PRIVATE */,
png_realloc_array,(png_const_structrp png_ptr, png_const_voidp old_array,
int old_elements, int add_elements, size_t element_size),PNG_ALLOCATED)
{
/* These are internal errors: */
if (add_elements <= 0 || element_size == 0 || old_elements < 0 ||
(old_array == NULL && old_elements > 0))
png_error(png_ptr, "internal error: array realloc");
/* Check for overflow on the elements count (so the caller does not have to
* check.)
*/
if (add_elements <= INT_MAX - old_elements)
{
png_voidp new_array = png_malloc_array_checked(png_ptr,
old_elements+add_elements, element_size);
if (new_array != NULL)
{
/* Because png_malloc_array worked the size calculations below cannot
* overflow.
*/
if (old_elements > 0)
memcpy(new_array, old_array, element_size*(unsigned)old_elements);
memset((char*)new_array + element_size*(unsigned)old_elements, 0,
element_size*(unsigned)add_elements);
return new_array;
}
}
return NULL; /* error */
}
#endif /* TEXT || sPLT || STORE_UNKNOWN_CHUNKS */
/* Various functions that have different error handling are derived from this.
* png_malloc always exists, but if PNG_USER_MEM_SUPPORTED is defined a separate
* function png_malloc_default is also provided.
*/
PNG_FUNCTION(png_voidp,PNGAPI
png_malloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
{
png_voidp ret;
if (png_ptr == NULL)
return NULL;
ret = png_malloc_base(png_ptr, size);
if (ret == NULL)
png_error(png_ptr, "Out of memory"); /* 'm' means png_malloc */
return ret;
}
#ifdef PNG_USER_MEM_SUPPORTED
PNG_FUNCTION(png_voidp,PNGAPI
png_malloc_default,(png_const_structrp png_ptr, png_alloc_size_t size),
PNG_ALLOCATED PNG_DEPRECATED)
{
png_voidp ret;
if (png_ptr == NULL)
return NULL;
/* Passing 'NULL' here bypasses the application provided memory handler. */
ret = png_malloc_base(NULL/*use malloc*/, size);
if (ret == NULL)
png_error(png_ptr, "Out of Memory"); /* 'M' means png_malloc_default */
return ret;
}
#endif /* USER_MEM */
/* This function was added at libpng version 1.2.3. The png_malloc_warn()
* function will issue a png_warning and return NULL instead of issuing a
* png_error, if it fails to allocate the requested memory.
*/
PNG_FUNCTION(png_voidp,PNGAPI
png_malloc_warn,(png_const_structrp png_ptr, png_alloc_size_t size),
PNG_ALLOCATED)
{
if (png_ptr != NULL)
{
png_voidp ret = png_malloc_base(png_ptr, size);
if (ret != NULL)
return ret;
png_warning(png_ptr, "Out of memory");
}
return NULL;
}
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
* without taking any action.
*/
void PNGAPI
png_free(png_const_structrp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL || ptr == NULL)
return;
#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr->free_fn != NULL)
png_ptr->free_fn(png_constcast(png_structrp,png_ptr), ptr);
else
png_free_default(png_ptr, ptr);
}
PNG_FUNCTION(void,PNGAPI
png_free_default,(png_const_structrp png_ptr, png_voidp ptr),PNG_DEPRECATED)
{
if (png_ptr == NULL || ptr == NULL)
return;
#endif /* USER_MEM */
free(ptr);
}
#ifdef PNG_USER_MEM_SUPPORTED
/* This function is called when the application wants to use another method
* of allocating and freeing memory.
*/
void PNGAPI
png_set_mem_fn(png_structrp png_ptr, png_voidp mem_ptr, png_malloc_ptr
malloc_fn, png_free_ptr free_fn)
{
if (png_ptr != NULL)
{
png_ptr->mem_ptr = mem_ptr;
png_ptr->malloc_fn = malloc_fn;
png_ptr->free_fn = free_fn;
}
}
/* This function returns a pointer to the mem_ptr associated with the user
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
png_voidp PNGAPI
png_get_mem_ptr(png_const_structrp png_ptr)
{
if (png_ptr == NULL)
return NULL;
return png_ptr->mem_ptr;
}
#endif /* USER_MEM */
#endif /* READ || WRITE */

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/* pngrio.c - functions for data input
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* This file provides a location for all input. Users who need
* special handling are expected to write a function that has the same
* arguments as this and performs a similar function, but that possibly
* has a different input method. Note that you shouldn't change this
* function, but rather write a replacement function and then make
* libpng use it at run time with png_set_read_fn(...).
*/
#include "pngpriv.h"
#ifdef PNG_READ_SUPPORTED
/* Read the data from whatever input you are using. The default routine
* reads from a file pointer. Note that this routine sometimes gets called
* with very small lengths, so you should implement some kind of simple
* buffering if you are using unbuffered reads. This should never be asked
* to read more than 64K on a 16-bit machine.
*/
void /* PRIVATE */
png_read_data(png_structrp png_ptr, png_bytep data, size_t length)
{
png_debug1(4, "reading %d bytes", (int)length);
if (png_ptr->read_data_fn != NULL)
(*(png_ptr->read_data_fn))(png_ptr, data, length);
else
png_error(png_ptr, "Call to NULL read function");
}
#ifdef PNG_STDIO_SUPPORTED
/* This is the function that does the actual reading of data. If you are
* not reading from a standard C stream, you should create a replacement
* read_data function and use it at run time with png_set_read_fn(), rather
* than changing the library.
*/
void PNGCBAPI
png_default_read_data(png_structp png_ptr, png_bytep data, size_t length)
{
size_t check;
if (png_ptr == NULL)
return;
/* fread() returns 0 on error, so it is OK to store this in a size_t
* instead of an int, which is what fread() actually returns.
*/
check = fread(data, 1, length, png_voidcast(png_FILE_p, png_ptr->io_ptr));
if (check != length)
png_error(png_ptr, "Read Error");
}
#endif
/* This function allows the application to supply a new input function
* for libpng if standard C streams aren't being used.
*
* This function takes as its arguments:
*
* png_ptr - pointer to a png input data structure
*
* io_ptr - pointer to user supplied structure containing info about
* the input functions. May be NULL.
*
* read_data_fn - pointer to a new input function that takes as its
* arguments a pointer to a png_struct, a pointer to
* a location where input data can be stored, and a 32-bit
* unsigned int that is the number of bytes to be read.
* To exit and output any fatal error messages the new write
* function should call png_error(png_ptr, "Error msg").
* May be NULL, in which case libpng's default function will
* be used.
*/
void PNGAPI
png_set_read_fn(png_structrp png_ptr, png_voidp io_ptr,
png_rw_ptr read_data_fn)
{
if (png_ptr == NULL)
return;
png_ptr->io_ptr = io_ptr;
#ifdef PNG_STDIO_SUPPORTED
if (read_data_fn != NULL)
png_ptr->read_data_fn = read_data_fn;
else
png_ptr->read_data_fn = png_default_read_data;
#else
png_ptr->read_data_fn = read_data_fn;
#endif
#ifdef PNG_WRITE_SUPPORTED
/* It is an error to write to a read device */
if (png_ptr->write_data_fn != NULL)
{
png_ptr->write_data_fn = NULL;
png_warning(png_ptr,
"Can't set both read_data_fn and write_data_fn in the"
" same structure");
}
#endif
#ifdef PNG_WRITE_FLUSH_SUPPORTED
png_ptr->output_flush_fn = NULL;
#endif
}
#endif /* READ */

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/* pngstruct.h - header file for PNG reference library
*
* Copyright (c) 2018-2022 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* The structure that holds the information to read and write PNG files.
* The only people who need to care about what is inside of this are the
* people who will be modifying the library for their own special needs.
* It should NOT be accessed directly by an application.
*/
#ifndef PNGSTRUCT_H
#define PNGSTRUCT_H
/* zlib.h defines the structure z_stream, an instance of which is included
* in this structure and is required for decompressing the LZ compressed
* data in PNG files.
*/
#ifndef ZLIB_CONST
/* We must ensure that zlib uses 'const' in declarations. */
# define ZLIB_CONST
#endif
#include "zlib.h"
#ifdef const
/* zlib.h sometimes #defines const to nothing, undo this. */
# undef const
#endif
/* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
* with older builds.
*/
#if ZLIB_VERNUM < 0x1260
# define PNGZ_MSG_CAST(s) png_constcast(char*,s)
# define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
#else
# define PNGZ_MSG_CAST(s) (s)
# define PNGZ_INPUT_CAST(b) (b)
#endif
/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
* can handle at once. This type need be no larger than 16 bits (so maximum of
* 65535), this define allows us to discover how big it is, but limited by the
* maximum for size_t. The value can be overridden in a library build
* (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
* lower value (e.g. 255 works). A lower value may help memory usage (slightly)
* and may even improve performance on some systems (and degrade it on others.)
*/
#ifndef ZLIB_IO_MAX
# define ZLIB_IO_MAX ((uInt)-1)
#endif
#ifdef PNG_WRITE_SUPPORTED
/* The type of a compression buffer list used by the write code. */
typedef struct png_compression_buffer
{
struct png_compression_buffer *next;
png_byte output[1]; /* actually zbuf_size */
} png_compression_buffer, *png_compression_bufferp;
#define PNG_COMPRESSION_BUFFER_SIZE(pp)\
(offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
#endif
/* Colorspace support; structures used in png_struct, png_info and in internal
* functions to hold and communicate information about the color space.
*
* PNG_COLORSPACE_SUPPORTED is only required if the application will perform
* colorspace corrections, otherwise all the colorspace information can be
* skipped and the size of libpng can be reduced (significantly) by compiling
* out the colorspace support.
*/
#ifdef PNG_COLORSPACE_SUPPORTED
/* The chromaticities of the red, green and blue colorants and the chromaticity
* of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
*/
typedef struct png_xy
{
png_fixed_point redx, redy;
png_fixed_point greenx, greeny;
png_fixed_point bluex, bluey;
png_fixed_point whitex, whitey;
} png_xy;
/* The same data as above but encoded as CIE XYZ values. When this data comes
* from chromaticities the sum of the Y values is assumed to be 1.0
*/
typedef struct png_XYZ
{
png_fixed_point red_X, red_Y, red_Z;
png_fixed_point green_X, green_Y, green_Z;
png_fixed_point blue_X, blue_Y, blue_Z;
} png_XYZ;
#endif /* COLORSPACE */
#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
/* A colorspace is all the above plus, potentially, profile information;
* however at present libpng does not use the profile internally so it is only
* stored in the png_info struct (if iCCP is supported.) The rendering intent
* is retained here and is checked.
*
* The file gamma encoding information is also stored here and gamma correction
* is done by libpng, whereas color correction must currently be done by the
* application.
*/
typedef struct png_colorspace
{
#ifdef PNG_GAMMA_SUPPORTED
png_fixed_point gamma; /* File gamma */
#endif
#ifdef PNG_COLORSPACE_SUPPORTED
png_xy end_points_xy; /* End points as chromaticities */
png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */
png_uint_16 rendering_intent; /* Rendering intent of a profile */
#endif
/* Flags are always defined to simplify the code. */
png_uint_16 flags; /* As defined below */
} png_colorspace, * PNG_RESTRICT png_colorspacerp;
typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
/* General flags for the 'flags' field */
#define PNG_COLORSPACE_HAVE_GAMMA 0x0001
#define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
#define PNG_COLORSPACE_HAVE_INTENT 0x0004
#define PNG_COLORSPACE_FROM_gAMA 0x0008
#define PNG_COLORSPACE_FROM_cHRM 0x0010
#define PNG_COLORSPACE_FROM_sRGB 0x0020
#define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
#define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */
#define PNG_COLORSPACE_INVALID 0x8000
#define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags))
#endif /* COLORSPACE || GAMMA */
struct png_struct_def
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */
png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */
size_t jmp_buf_size; /* size of the above, if allocated */
#endif
png_error_ptr error_fn; /* function for printing errors and aborting */
#ifdef PNG_WARNINGS_SUPPORTED
png_error_ptr warning_fn; /* function for printing warnings */
#endif
png_voidp error_ptr; /* user supplied struct for error functions */
png_rw_ptr write_data_fn; /* function for writing output data */
png_rw_ptr read_data_fn; /* function for reading input data */
png_voidp io_ptr; /* ptr to application struct for I/O functions */
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
png_user_transform_ptr read_user_transform_fn; /* user read transform */
#endif
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
png_user_transform_ptr write_user_transform_fn; /* user write transform */
#endif
/* These were added in libpng-1.0.2 */
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
png_voidp user_transform_ptr; /* user supplied struct for user transform */
png_byte user_transform_depth; /* bit depth of user transformed pixels */
png_byte user_transform_channels; /* channels in user transformed pixels */
#endif
#endif
png_uint_32 mode; /* tells us where we are in the PNG file */
png_uint_32 flags; /* flags indicating various things to libpng */
png_uint_32 transformations; /* which transformations to perform */
png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
z_stream zstream; /* decompression structure */
#ifdef PNG_WRITE_SUPPORTED
png_compression_bufferp zbuffer_list; /* Created on demand during write */
uInt zbuffer_size; /* size of the actual buffer */
int zlib_level; /* holds zlib compression level */
int zlib_method; /* holds zlib compression method */
int zlib_window_bits; /* holds zlib compression window bits */
int zlib_mem_level; /* holds zlib compression memory level */
int zlib_strategy; /* holds zlib compression strategy */
#endif
/* Added at libpng 1.5.4 */
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
int zlib_text_level; /* holds zlib compression level */
int zlib_text_method; /* holds zlib compression method */
int zlib_text_window_bits; /* holds zlib compression window bits */
int zlib_text_mem_level; /* holds zlib compression memory level */
int zlib_text_strategy; /* holds zlib compression strategy */
#endif
/* End of material added at libpng 1.5.4 */
/* Added at libpng 1.6.0 */
#ifdef PNG_WRITE_SUPPORTED
int zlib_set_level; /* Actual values set into the zstream on write */
int zlib_set_method;
int zlib_set_window_bits;
int zlib_set_mem_level;
int zlib_set_strategy;
#endif
png_uint_32 width; /* width of image in pixels */
png_uint_32 height; /* height of image in pixels */
png_uint_32 num_rows; /* number of rows in current pass */
png_uint_32 usr_width; /* width of row at start of write */
size_t rowbytes; /* size of row in bytes */
png_uint_32 iwidth; /* width of current interlaced row in pixels */
png_uint_32 row_number; /* current row in interlace pass */
png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
png_bytep prev_row; /* buffer to save previous (unfiltered) row.
* While reading this is a pointer into
* big_prev_row; while writing it is separately
* allocated if needed.
*/
png_bytep row_buf; /* buffer to save current (unfiltered) row.
* While reading, this is a pointer into
* big_row_buf; while writing it is separately
* allocated.
*/
#ifdef PNG_WRITE_FILTER_SUPPORTED
png_bytep try_row; /* buffer to save trial row when filtering */
png_bytep tst_row; /* buffer to save best trial row when filtering */
#endif
size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
png_uint_32 idat_size; /* current IDAT size for read */
png_uint_32 crc; /* current chunk CRC value */
png_colorp palette; /* palette from the input file */
png_uint_16 num_palette; /* number of color entries in palette */
/* Added at libpng-1.5.10 */
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
int num_palette_max; /* maximum palette index found in IDAT */
#endif
png_uint_16 num_trans; /* number of transparency values */
png_byte compression; /* file compression type (always 0) */
png_byte filter; /* file filter type (always 0) */
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
png_byte pass; /* current interlace pass (0 - 6) */
png_byte do_filter; /* row filter flags (see PNG_FILTER_ in png.h ) */
png_byte color_type; /* color type of file */
png_byte bit_depth; /* bit depth of file */
png_byte usr_bit_depth; /* bit depth of users row: write only */
png_byte pixel_depth; /* number of bits per pixel */
png_byte channels; /* number of channels in file */
#ifdef PNG_WRITE_SUPPORTED
png_byte usr_channels; /* channels at start of write: write only */
#endif
png_byte sig_bytes; /* magic bytes read/written from start of file */
png_byte maximum_pixel_depth;
/* pixel depth used for the row buffers */
png_byte transformed_pixel_depth;
/* pixel depth after read/write transforms */
#if ZLIB_VERNUM >= 0x1240
png_byte zstream_start; /* at start of an input zlib stream */
#endif /* Zlib >= 1.2.4 */
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
png_uint_16 filler; /* filler bytes for pixel expansion */
#endif
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
defined(PNG_READ_ALPHA_MODE_SUPPORTED)
png_byte background_gamma_type;
png_fixed_point background_gamma;
png_color_16 background; /* background color in screen gamma space */
#ifdef PNG_READ_GAMMA_SUPPORTED
png_color_16 background_1; /* background normalized to gamma 1.0 */
#endif
#endif /* bKGD */
#ifdef PNG_WRITE_FLUSH_SUPPORTED
png_flush_ptr output_flush_fn; /* Function for flushing output */
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
png_uint_32 flush_rows; /* number of rows written since last flush */
#endif
#ifdef PNG_READ_GAMMA_SUPPORTED
int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
png_bytep gamma_table; /* gamma table for 8-bit depth files */
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
png_bytep gamma_from_1; /* converts from 1.0 to screen */
png_bytep gamma_to_1; /* converts from file to 1.0 */
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
png_color_8 sig_bit; /* significant bits in each available channel */
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
png_color_8 shift; /* shift for significant bit transformation */
#endif
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
png_bytep trans_alpha; /* alpha values for paletted files */
png_color_16 trans_color; /* transparent color for non-paletted files */
#endif
png_read_status_ptr read_row_fn; /* called after each row is decoded */
png_write_status_ptr write_row_fn; /* called after each row is encoded */
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
png_progressive_info_ptr info_fn; /* called after header data fully read */
png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */
png_progressive_end_ptr end_fn; /* called after image is complete */
png_bytep save_buffer_ptr; /* current location in save_buffer */
png_bytep save_buffer; /* buffer for previously read data */
png_bytep current_buffer_ptr; /* current location in current_buffer */
png_bytep current_buffer; /* buffer for recently used data */
png_uint_32 push_length; /* size of current input chunk */
png_uint_32 skip_length; /* bytes to skip in input data */
size_t save_buffer_size; /* amount of data now in save_buffer */
size_t save_buffer_max; /* total size of save_buffer */
size_t buffer_size; /* total amount of available input data */
size_t current_buffer_size; /* amount of data now in current_buffer */
int process_mode; /* what push library is currently doing */
int cur_palette; /* current push library palette index */
#endif /* PROGRESSIVE_READ */
#ifdef PNG_READ_QUANTIZE_SUPPORTED
png_bytep palette_lookup; /* lookup table for quantizing */
png_bytep quantize_index; /* index translation for palette files */
#endif
/* Options */
#ifdef PNG_SET_OPTION_SUPPORTED
png_uint_32 options; /* On/off state (up to 16 options) */
#endif
#if PNG_LIBPNG_VER < 10700
/* To do: remove this from libpng-1.7 */
#ifdef PNG_TIME_RFC1123_SUPPORTED
char time_buffer[29]; /* String to hold RFC 1123 time text */
#endif
#endif
/* New members added in libpng-1.0.6 */
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
#ifdef PNG_USER_CHUNKS_SUPPORTED
png_voidp user_chunk_ptr;
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
#endif
#endif
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
int unknown_default; /* As PNG_HANDLE_* */
unsigned int num_chunk_list; /* Number of entries in the list */
png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name
* followed by a PNG_HANDLE_* byte */
#endif
/* New members added in libpng-1.0.3 */
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
png_byte rgb_to_gray_status;
/* Added in libpng 1.5.5 to record setting of coefficients: */
png_byte rgb_to_gray_coefficients_set;
/* These were changed from png_byte in libpng-1.0.6 */
png_uint_16 rgb_to_gray_red_coeff;
png_uint_16 rgb_to_gray_green_coeff;
/* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
#endif
/* New member added in libpng-1.6.36 */
#if defined(PNG_READ_EXPAND_SUPPORTED) && \
defined(PNG_ARM_NEON_IMPLEMENTATION)
png_bytep riffled_palette; /* buffer for accelerated palette expansion */
#endif
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
#if defined(PNG_MNG_FEATURES_SUPPORTED)
/* Changed from png_byte to png_uint_32 at version 1.2.0 */
png_uint_32 mng_features_permitted;
#endif
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
#ifdef PNG_MNG_FEATURES_SUPPORTED
png_byte filter_type;
#endif
/* New members added in libpng-1.2.0 */
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
#ifdef PNG_USER_MEM_SUPPORTED
png_voidp mem_ptr; /* user supplied struct for mem functions */
png_malloc_ptr malloc_fn; /* function for allocating memory */
png_free_ptr free_fn; /* function for freeing memory */
#endif
/* New member added in libpng-1.0.13 and 1.2.0 */
png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
#ifdef PNG_READ_QUANTIZE_SUPPORTED
/* The following three members were added at version 1.0.14 and 1.2.4 */
png_bytep quantize_sort; /* working sort array */
png_bytep index_to_palette; /* where the original index currently is
in the palette */
png_bytep palette_to_index; /* which original index points to this
palette color */
#endif
/* New members added in libpng-1.0.16 and 1.2.6 */
png_byte compression_type;
#ifdef PNG_USER_LIMITS_SUPPORTED
png_uint_32 user_width_max;
png_uint_32 user_height_max;
/* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
* chunks that can be stored (0 means unlimited).
*/
png_uint_32 user_chunk_cache_max;
/* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
* can occupy when decompressed. 0 means unlimited.
*/
png_alloc_size_t user_chunk_malloc_max;
#endif
/* New member added in libpng-1.0.25 and 1.2.17 */
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
/* Temporary storage for unknown chunk that the library doesn't recognize,
* used while reading the chunk.
*/
png_unknown_chunk unknown_chunk;
#endif
/* New member added in libpng-1.2.26 */
size_t old_big_row_buf_size;
#ifdef PNG_READ_SUPPORTED
/* New member added in libpng-1.2.30 */
png_bytep read_buffer; /* buffer for reading chunk data */
png_alloc_size_t read_buffer_size; /* current size of the buffer */
#endif
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
uInt IDAT_read_size; /* limit on read buffer size for IDAT */
#endif
#ifdef PNG_IO_STATE_SUPPORTED
/* New member added in libpng-1.4.0 */
png_uint_32 io_state;
#endif
/* New member added in libpng-1.5.6 */
png_bytep big_prev_row;
/* New member added in libpng-1.5.7 */
void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
png_bytep row, png_const_bytep prev_row);
#ifdef PNG_READ_SUPPORTED
#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
png_colorspace colorspace;
#endif
#endif
};
#endif /* PNGSTRUCT_H */

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/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* Copyright (c) 2018-2024 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
#include "pngpriv.h"
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* Turn on BGR-to-RGB mapping */
void PNGAPI
png_set_bgr(png_structrp png_ptr)
{
png_debug(1, "in png_set_bgr");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_BGR;
}
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* Turn on 16-bit byte swapping */
void PNGAPI
png_set_swap(png_structrp png_ptr)
{
png_debug(1, "in png_set_swap");
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth == 16)
png_ptr->transformations |= PNG_SWAP_BYTES;
}
#endif
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
/* Turn on pixel packing */
void PNGAPI
png_set_packing(png_structrp png_ptr)
{
png_debug(1, "in png_set_packing");
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth < 8)
{
png_ptr->transformations |= PNG_PACK;
# ifdef PNG_WRITE_SUPPORTED
png_ptr->usr_bit_depth = 8;
# endif
}
}
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* Turn on packed pixel swapping */
void PNGAPI
png_set_packswap(png_structrp png_ptr)
{
png_debug(1, "in png_set_packswap");
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth < 8)
png_ptr->transformations |= PNG_PACKSWAP;
}
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
void PNGAPI
png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits)
{
png_debug(1, "in png_set_shift");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_SHIFT;
png_ptr->shift = *true_bits;
}
#endif
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
defined(PNG_WRITE_INTERLACING_SUPPORTED)
int PNGAPI
png_set_interlace_handling(png_structrp png_ptr)
{
png_debug(1, "in png_set_interlace handling");
if (png_ptr != 0 && png_ptr->interlaced != 0)
{
png_ptr->transformations |= PNG_INTERLACE;
return 7;
}
return 1;
}
#endif
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
/* Add a filler byte on read, or remove a filler or alpha byte on write.
* The filler type has changed in v0.95 to allow future 2-byte fillers
* for 48-bit input data, as well as to avoid problems with some compilers
* that don't like bytes as parameters.
*/
void PNGAPI
png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_filler");
if (png_ptr == NULL)
return;
/* In libpng 1.6 it is possible to determine whether this is a read or write
* operation and therefore to do more checking here for a valid call.
*/
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
{
# ifdef PNG_READ_FILLER_SUPPORTED
/* On read png_set_filler is always valid, regardless of the base PNG
* format, because other transformations can give a format where the
* filler code can execute (basically an 8 or 16-bit component RGB or G
* format.)
*
* NOTE: usr_channels is not used by the read code! (This has led to
* confusion in the past.) The filler is only used in the read code.
*/
png_ptr->filler = (png_uint_16)filler;
# else
png_app_error(png_ptr, "png_set_filler not supported on read");
PNG_UNUSED(filler) /* not used in the write case */
return;
# endif
}
else /* write */
{
# ifdef PNG_WRITE_FILLER_SUPPORTED
/* On write the usr_channels parameter must be set correctly at the
* start to record the number of channels in the app-supplied data.
*/
switch (png_ptr->color_type)
{
case PNG_COLOR_TYPE_RGB:
png_ptr->usr_channels = 4;
break;
case PNG_COLOR_TYPE_GRAY:
if (png_ptr->bit_depth >= 8)
{
png_ptr->usr_channels = 2;
break;
}
else
{
/* There simply isn't any code in libpng to strip out bits
* from bytes when the components are less than a byte in
* size!
*/
png_app_error(png_ptr,
"png_set_filler is invalid for"
" low bit depth gray output");
return;
}
default:
png_app_error(png_ptr,
"png_set_filler: inappropriate color type");
return;
}
# else
png_app_error(png_ptr, "png_set_filler not supported on write");
return;
# endif
}
/* Here on success - libpng supports the operation, set the transformation
* and the flag to say where the filler channel is.
*/
png_ptr->transformations |= PNG_FILLER;
if (filler_loc == PNG_FILLER_AFTER)
png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
else
png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
}
/* Added to libpng-1.2.7 */
void PNGAPI
png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_add_alpha");
if (png_ptr == NULL)
return;
png_set_filler(png_ptr, filler, filler_loc);
/* The above may fail to do anything. */
if ((png_ptr->transformations & PNG_FILLER) != 0)
png_ptr->transformations |= PNG_ADD_ALPHA;
}
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
void PNGAPI
png_set_swap_alpha(png_structrp png_ptr)
{
png_debug(1, "in png_set_swap_alpha");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_SWAP_ALPHA;
}
#endif
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
void PNGAPI
png_set_invert_alpha(png_structrp png_ptr)
{
png_debug(1, "in png_set_invert_alpha");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_INVERT_ALPHA;
}
#endif
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
void PNGAPI
png_set_invert_mono(png_structrp png_ptr)
{
png_debug(1, "in png_set_invert_mono");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_INVERT_MONO;
}
/* Invert monochrome grayscale data */
void /* PRIVATE */
png_do_invert(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_invert");
/* This test removed from libpng version 1.0.13 and 1.2.0:
* if (row_info->bit_depth == 1 &&
*/
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_bytep rp = row;
size_t i;
size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(~(*rp));
rp++;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
row_info->bit_depth == 8)
{
png_bytep rp = row;
size_t i;
size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 2)
{
*rp = (png_byte)(~(*rp));
rp += 2;
}
}
#ifdef PNG_16BIT_SUPPORTED
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
row_info->bit_depth == 16)
{
png_bytep rp = row;
size_t i;
size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 4)
{
*rp = (png_byte)(~(*rp));
*(rp + 1) = (png_byte)(~(*(rp + 1)));
rp += 4;
}
}
#endif
}
#endif
#ifdef PNG_16BIT_SUPPORTED
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* Swaps byte order on 16-bit depth images */
void /* PRIVATE */
png_do_swap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_swap");
if (row_info->bit_depth == 16)
{
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop= row_info->width * row_info->channels;
for (i = 0; i < istop; i++, rp += 2)
{
#ifdef PNG_BUILTIN_BSWAP16_SUPPORTED
/* Feature added to libpng-1.6.11 for testing purposes, not
* enabled by default.
*/
*(png_uint_16*)rp = __builtin_bswap16(*(png_uint_16*)rp);
#else
png_byte t = *rp;
*rp = *(rp + 1);
*(rp + 1) = t;
#endif
}
}
}
#endif
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
static const png_byte onebppswaptable[256] = {
0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
};
static const png_byte twobppswaptable[256] = {
0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,
0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,
0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,
0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,
0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,
0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,
0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,
0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,
0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,
0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,
0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,
0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,
0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,
0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,
0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,
0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,
0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,
0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,
0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,
0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,
0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,
0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,
0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,
0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,
0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,
0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,
0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,
0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,
0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
};
static const png_byte fourbppswaptable[256] = {
0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,
0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,
0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,
0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,
0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,
0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,
0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,
0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,
0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,
0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,
0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,
0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,
0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,
0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,
0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,
0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,
0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,
0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,
0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,
0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,
0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,
0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,
0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,
0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,
0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,
0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,
0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,
0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,
0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
};
/* Swaps pixel packing order within bytes */
void /* PRIVATE */
png_do_packswap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_packswap");
if (row_info->bit_depth < 8)
{
png_bytep rp;
png_const_bytep end, table;
end = row + row_info->rowbytes;
if (row_info->bit_depth == 1)
table = onebppswaptable;
else if (row_info->bit_depth == 2)
table = twobppswaptable;
else if (row_info->bit_depth == 4)
table = fourbppswaptable;
else
return;
for (rp = row; rp < end; rp++)
*rp = table[*rp];
}
}
#endif /* PACKSWAP || WRITE_PACKSWAP */
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
/* Remove a channel - this used to be 'png_do_strip_filler' but it used a
* somewhat weird combination of flags to determine what to do. All the calls
* to png_do_strip_filler are changed in 1.5.2 to call this instead with the
* correct arguments.
*
* The routine isn't general - the channel must be the channel at the start or
* end (not in the middle) of each pixel.
*/
void /* PRIVATE */
png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
{
png_bytep sp = row; /* source pointer */
png_bytep dp = row; /* destination pointer */
png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */
png_debug(1, "in png_do_strip_channel");
/* At the start sp will point to the first byte to copy and dp to where
* it is copied to. ep always points just beyond the end of the row, so
* the loop simply copies (channels-1) channels until sp reaches ep.
*
* at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.
* nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.
*/
/* GA, GX, XG cases */
if (row_info->channels == 2)
{
if (row_info->bit_depth == 8)
{
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channel and, for sp, the filler */
{
sp += 2; ++dp;
}
/* For a 1 pixel wide image there is nothing to do */
while (sp < ep)
{
*dp++ = *sp; sp += 2;
}
row_info->pixel_depth = 8;
}
else if (row_info->bit_depth == 16)
{
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channel and, for sp, the filler */
{
sp += 4; dp += 2;
}
while (sp < ep)
{
*dp++ = *sp++; *dp++ = *sp; sp += 3;
}
row_info->pixel_depth = 16;
}
else
return; /* bad bit depth */
row_info->channels = 1;
/* Finally fix the color type if it records an alpha channel */
if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
row_info->color_type = PNG_COLOR_TYPE_GRAY;
}
/* RGBA, RGBX, XRGB cases */
else if (row_info->channels == 4)
{
if (row_info->bit_depth == 8)
{
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channels and, for sp, the filler */
{
sp += 4; dp += 3;
}
/* Note that the loop adds 3 to dp and 4 to sp each time. */
while (sp < ep)
{
*dp++ = *sp++; *dp++ = *sp++; *dp++ = *sp; sp += 2;
}
row_info->pixel_depth = 24;
}
else if (row_info->bit_depth == 16)
{
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channels and, for sp, the filler */
{
sp += 8; dp += 6;
}
while (sp < ep)
{
/* Copy 6 bytes, skip 2 */
*dp++ = *sp++; *dp++ = *sp++;
*dp++ = *sp++; *dp++ = *sp++;
*dp++ = *sp++; *dp++ = *sp; sp += 3;
}
row_info->pixel_depth = 48;
}
else
return; /* bad bit depth */
row_info->channels = 3;
/* Finally fix the color type if it records an alpha channel */
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
row_info->color_type = PNG_COLOR_TYPE_RGB;
}
else
return; /* The filler channel has gone already */
/* Fix the rowbytes value. */
row_info->rowbytes = (size_t)(dp-row);
}
#endif
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* Swaps red and blue bytes within a pixel */
void /* PRIVATE */
png_do_bgr(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_bgr");
if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
png_uint_32 row_width = row_info->width;
if (row_info->bit_depth == 8)
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 3)
{
png_byte save = *rp;
*rp = *(rp + 2);
*(rp + 2) = save;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 4)
{
png_byte save = *rp;
*rp = *(rp + 2);
*(rp + 2) = save;
}
}
}
#ifdef PNG_16BIT_SUPPORTED
else if (row_info->bit_depth == 16)
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 6)
{
png_byte save = *rp;
*rp = *(rp + 4);
*(rp + 4) = save;
save = *(rp + 1);
*(rp + 1) = *(rp + 5);
*(rp + 5) = save;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 8)
{
png_byte save = *rp;
*rp = *(rp + 4);
*(rp + 4) = save;
save = *(rp + 1);
*(rp + 1) = *(rp + 5);
*(rp + 5) = save;
}
}
}
#endif
}
}
#endif /* READ_BGR || WRITE_BGR */
#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
/* Added at libpng-1.5.10 */
void /* PRIVATE */
png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
{
png_debug(1, "in png_do_check_palette_indexes");
if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
{
/* Calculations moved outside switch in an attempt to stop different
* compiler warnings. 'padding' is in *bits* within the last byte, it is
* an 'int' because pixel_depth becomes an 'int' in the expression below,
* and this calculation is used because it avoids warnings that other
* forms produced on either GCC or MSVC.
*/
int padding = PNG_PADBITS(row_info->pixel_depth, row_info->width);
png_bytep rp = png_ptr->row_buf + row_info->rowbytes;
switch (row_info->bit_depth)
{
case 1:
{
/* in this case, all bytes must be 0 so we don't need
* to unpack the pixels except for the rightmost one.
*/
for (; rp > png_ptr->row_buf; rp--)
{
if ((*rp >> padding) != 0)
png_ptr->num_palette_max = 1;
padding = 0;
}
break;
}
case 2:
{
for (; rp > png_ptr->row_buf; rp--)
{
int i = ((*rp >> padding) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 2) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 4) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 6) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
padding = 0;
}
break;
}
case 4:
{
for (; rp > png_ptr->row_buf; rp--)
{
int i = ((*rp >> padding) & 0x0f);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 4) & 0x0f);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
padding = 0;
}
break;
}
case 8:
{
for (; rp > png_ptr->row_buf; rp--)
{
if (*rp > png_ptr->num_palette_max)
png_ptr->num_palette_max = (int) *rp;
}
break;
}
default:
break;
}
}
}
#endif /* CHECK_FOR_INVALID_INDEX */
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
void PNGAPI
png_set_user_transform_info(png_structrp png_ptr, png_voidp
user_transform_ptr, int user_transform_depth, int user_transform_channels)
{
png_debug(1, "in png_set_user_transform_info");
if (png_ptr == NULL)
return;
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
(png_ptr->flags & PNG_FLAG_ROW_INIT) != 0)
{
png_app_error(png_ptr,
"info change after png_start_read_image or png_read_update_info");
return;
}
#endif
png_ptr->user_transform_ptr = user_transform_ptr;
png_ptr->user_transform_depth = (png_byte)user_transform_depth;
png_ptr->user_transform_channels = (png_byte)user_transform_channels;
}
#endif
/* This function returns a pointer to the user_transform_ptr associated with
* the user transform functions. The application should free any memory
* associated with this pointer before png_write_destroy and png_read_destroy
* are called.
*/
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
png_voidp PNGAPI
png_get_user_transform_ptr(png_const_structrp png_ptr)
{
if (png_ptr == NULL)
return NULL;
return png_ptr->user_transform_ptr;
}
#endif
#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
png_uint_32 PNGAPI
png_get_current_row_number(png_const_structrp png_ptr)
{
/* See the comments in png.h - this is the sub-image row when reading an
* interlaced image.
*/
if (png_ptr != NULL)
return png_ptr->row_number;
return PNG_UINT_32_MAX; /* help the app not to fail silently */
}
png_byte PNGAPI
png_get_current_pass_number(png_const_structrp png_ptr)
{
if (png_ptr != NULL)
return png_ptr->pass;
return 8; /* invalid */
}
#endif /* USER_TRANSFORM_INFO */
#endif /* READ_USER_TRANSFORM || WRITE_USER_TRANSFORM */
#endif /* READ || WRITE */

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/* pngwio.c - functions for data output
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2014,2016,2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* This file provides a location for all output. Users who need
* special handling are expected to write functions that have the same
* arguments as these and perform similar functions, but that possibly
* use different output methods. Note that you shouldn't change these
* functions, but rather write replacement functions and then change
* them at run time with png_set_write_fn(...).
*/
#include "pngpriv.h"
#ifdef PNG_WRITE_SUPPORTED
/* Write the data to whatever output you are using. The default routine
* writes to a file pointer. Note that this routine sometimes gets called
* with very small lengths, so you should implement some kind of simple
* buffering if you are using unbuffered writes. This should never be asked
* to write more than 64K on a 16-bit machine.
*/
void /* PRIVATE */
png_write_data(png_structrp png_ptr, png_const_bytep data, size_t length)
{
/* NOTE: write_data_fn must not change the buffer! */
if (png_ptr->write_data_fn != NULL )
(*(png_ptr->write_data_fn))(png_ptr, png_constcast(png_bytep,data),
length);
else
png_error(png_ptr, "Call to NULL write function");
}
#ifdef PNG_STDIO_SUPPORTED
/* This is the function that does the actual writing of data. If you are
* not writing to a standard C stream, you should create a replacement
* write_data function and use it at run time with png_set_write_fn(), rather
* than changing the library.
*/
void PNGCBAPI
png_default_write_data(png_structp png_ptr, png_bytep data, size_t length)
{
size_t check;
if (png_ptr == NULL)
return;
check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
if (check != length)
png_error(png_ptr, "Write Error");
}
#endif
/* This function is called to output any data pending writing (normally
* to disk). After png_flush is called, there should be no data pending
* writing in any buffers.
*/
#ifdef PNG_WRITE_FLUSH_SUPPORTED
void /* PRIVATE */
png_flush(png_structrp png_ptr)
{
if (png_ptr->output_flush_fn != NULL)
(*(png_ptr->output_flush_fn))(png_ptr);
}
# ifdef PNG_STDIO_SUPPORTED
void PNGCBAPI
png_default_flush(png_structp png_ptr)
{
png_FILE_p io_ptr;
if (png_ptr == NULL)
return;
io_ptr = png_voidcast(png_FILE_p, (png_ptr->io_ptr));
fflush(io_ptr);
}
# endif
#endif
/* This function allows the application to supply new output functions for
* libpng if standard C streams aren't being used.
*
* This function takes as its arguments:
* png_ptr - pointer to a png output data structure
* io_ptr - pointer to user supplied structure containing info about
* the output functions. May be NULL.
* write_data_fn - pointer to a new output function that takes as its
* arguments a pointer to a png_struct, a pointer to
* data to be written, and a 32-bit unsigned int that is
* the number of bytes to be written. The new write
* function should call png_error(png_ptr, "Error msg")
* to exit and output any fatal error messages. May be
* NULL, in which case libpng's default function will
* be used.
* flush_data_fn - pointer to a new flush function that takes as its
* arguments a pointer to a png_struct. After a call to
* the flush function, there should be no data in any buffers
* or pending transmission. If the output method doesn't do
* any buffering of output, a function prototype must still be
* supplied although it doesn't have to do anything. If
* PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
* time, output_flush_fn will be ignored, although it must be
* supplied for compatibility. May be NULL, in which case
* libpng's default function will be used, if
* PNG_WRITE_FLUSH_SUPPORTED is defined. This is not
* a good idea if io_ptr does not point to a standard
* *FILE structure.
*/
void PNGAPI
png_set_write_fn(png_structrp png_ptr, png_voidp io_ptr,
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
{
if (png_ptr == NULL)
return;
png_ptr->io_ptr = io_ptr;
#ifdef PNG_STDIO_SUPPORTED
if (write_data_fn != NULL)
png_ptr->write_data_fn = write_data_fn;
else
png_ptr->write_data_fn = png_default_write_data;
#else
png_ptr->write_data_fn = write_data_fn;
#endif
#ifdef PNG_WRITE_FLUSH_SUPPORTED
# ifdef PNG_STDIO_SUPPORTED
if (output_flush_fn != NULL)
png_ptr->output_flush_fn = output_flush_fn;
else
png_ptr->output_flush_fn = png_default_flush;
# else
png_ptr->output_flush_fn = output_flush_fn;
# endif
#else
PNG_UNUSED(output_flush_fn)
#endif /* WRITE_FLUSH */
#ifdef PNG_READ_SUPPORTED
/* It is an error to read while writing a png file */
if (png_ptr->read_data_fn != NULL)
{
png_ptr->read_data_fn = NULL;
png_warning(png_ptr,
"Can't set both read_data_fn and write_data_fn in the"
" same structure");
}
#endif
}
#endif /* WRITE */

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/* pngwtran.c - transforms the data in a row for PNG writers
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
#include "pngpriv.h"
#ifdef PNG_WRITE_SUPPORTED
#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
#ifdef PNG_WRITE_PACK_SUPPORTED
/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The
* row_info bit depth should be 8 (one pixel per byte). The channels
* should be 1 (this only happens on grayscale and paletted images).
*/
static void
png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
{
png_debug(1, "in png_do_pack");
if (row_info->bit_depth == 8 &&
row_info->channels == 1)
{
switch ((int)bit_depth)
{
case 1:
{
png_bytep sp, dp;
int mask, v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
sp = row;
dp = row;
mask = 0x80;
v = 0;
for (i = 0; i < row_width; i++)
{
if (*sp != 0)
v |= mask;
sp++;
if (mask > 1)
mask >>= 1;
else
{
mask = 0x80;
*dp = (png_byte)v;
dp++;
v = 0;
}
}
if (mask != 0x80)
*dp = (png_byte)v;
break;
}
case 2:
{
png_bytep sp, dp;
unsigned int shift;
int v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
sp = row;
dp = row;
shift = 6;
v = 0;
for (i = 0; i < row_width; i++)
{
png_byte value;
value = (png_byte)(*sp & 0x03);
v |= (value << shift);
if (shift == 0)
{
shift = 6;
*dp = (png_byte)v;
dp++;
v = 0;
}
else
shift -= 2;
sp++;
}
if (shift != 6)
*dp = (png_byte)v;
break;
}
case 4:
{
png_bytep sp, dp;
unsigned int shift;
int v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
sp = row;
dp = row;
shift = 4;
v = 0;
for (i = 0; i < row_width; i++)
{
png_byte value;
value = (png_byte)(*sp & 0x0f);
v |= (value << shift);
if (shift == 0)
{
shift = 4;
*dp = (png_byte)v;
dp++;
v = 0;
}
else
shift -= 4;
sp++;
}
if (shift != 4)
*dp = (png_byte)v;
break;
}
default:
break;
}
row_info->bit_depth = (png_byte)bit_depth;
row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
row_info->width);
}
}
#endif
#ifdef PNG_WRITE_SHIFT_SUPPORTED
/* Shift pixel values to take advantage of whole range. Pass the
* true number of bits in bit_depth. The row should be packed
* according to row_info->bit_depth. Thus, if you had a row of
* bit depth 4, but the pixels only had values from 0 to 7, you
* would pass 3 as bit_depth, and this routine would translate the
* data to 0 to 15.
*/
static void
png_do_shift(png_row_infop row_info, png_bytep row,
png_const_color_8p bit_depth)
{
png_debug(1, "in png_do_shift");
if (row_info->color_type != PNG_COLOR_TYPE_PALETTE)
{
int shift_start[4], shift_dec[4];
unsigned int channels = 0;
if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
shift_start[channels] = row_info->bit_depth - bit_depth->red;
shift_dec[channels] = bit_depth->red;
channels++;
shift_start[channels] = row_info->bit_depth - bit_depth->green;
shift_dec[channels] = bit_depth->green;
channels++;
shift_start[channels] = row_info->bit_depth - bit_depth->blue;
shift_dec[channels] = bit_depth->blue;
channels++;
}
else
{
shift_start[channels] = row_info->bit_depth - bit_depth->gray;
shift_dec[channels] = bit_depth->gray;
channels++;
}
if ((row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0)
{
shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
shift_dec[channels] = bit_depth->alpha;
channels++;
}
/* With low row depths, could only be grayscale, so one channel */
if (row_info->bit_depth < 8)
{
png_bytep bp = row;
size_t i;
unsigned int mask;
size_t row_bytes = row_info->rowbytes;
if (bit_depth->gray == 1 && row_info->bit_depth == 2)
mask = 0x55;
else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
mask = 0x11;
else
mask = 0xff;
for (i = 0; i < row_bytes; i++, bp++)
{
int j;
unsigned int v, out;
v = *bp;
out = 0;
for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
{
if (j > 0)
out |= v << j;
else
out |= (v >> (-j)) & mask;
}
*bp = (png_byte)(out & 0xff);
}
}
else if (row_info->bit_depth == 8)
{
png_bytep bp = row;
png_uint_32 i;
png_uint_32 istop = channels * row_info->width;
for (i = 0; i < istop; i++, bp++)
{
unsigned int c = i%channels;
int j;
unsigned int v, out;
v = *bp;
out = 0;
for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
{
if (j > 0)
out |= v << j;
else
out |= v >> (-j);
}
*bp = (png_byte)(out & 0xff);
}
}
else
{
png_bytep bp;
png_uint_32 i;
png_uint_32 istop = channels * row_info->width;
for (bp = row, i = 0; i < istop; i++)
{
unsigned int c = i%channels;
int j;
unsigned int value, v;
v = png_get_uint_16(bp);
value = 0;
for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
{
if (j > 0)
value |= v << j;
else
value |= v >> (-j);
}
*bp++ = (png_byte)((value >> 8) & 0xff);
*bp++ = (png_byte)(value & 0xff);
}
}
}
}
#endif
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
static void
png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_write_swap_alpha");
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
if (row_info->bit_depth == 8)
{
/* This converts from ARGB to RGBA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
png_byte save = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = save;
}
}
#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
/* This converts from AARRGGBB to RRGGBBAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
png_byte save[2];
save[0] = *(sp++);
save[1] = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = save[0];
*(dp++) = save[1];
}
}
#endif /* WRITE_16BIT */
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
if (row_info->bit_depth == 8)
{
/* This converts from AG to GA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
png_byte save = *(sp++);
*(dp++) = *(sp++);
*(dp++) = save;
}
}
#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
/* This converts from AAGG to GGAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
png_byte save[2];
save[0] = *(sp++);
save[1] = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = save[0];
*(dp++) = save[1];
}
}
#endif /* WRITE_16BIT */
}
}
}
#endif
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
static void
png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_write_invert_alpha");
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
if (row_info->bit_depth == 8)
{
/* This inverts the alpha channel in RGBA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
/* Does nothing
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*/
sp+=3; dp = sp;
*dp = (png_byte)(255 - *(sp++));
}
}
#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
/* This inverts the alpha channel in RRGGBBAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
/* Does nothing
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*/
sp+=6; dp = sp;
*(dp++) = (png_byte)(255 - *(sp++));
*dp = (png_byte)(255 - *(sp++));
}
}
#endif /* WRITE_16BIT */
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
if (row_info->bit_depth == 8)
{
/* This inverts the alpha channel in GA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
*(dp++) = *(sp++);
*(dp++) = (png_byte)(255 - *(sp++));
}
}
#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
/* This inverts the alpha channel in GGAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
/* Does nothing
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*/
sp+=2; dp = sp;
*(dp++) = (png_byte)(255 - *(sp++));
*dp = (png_byte)(255 - *(sp++));
}
}
#endif /* WRITE_16BIT */
}
}
}
#endif
/* Transform the data according to the user's wishes. The order of
* transformations is significant.
*/
void /* PRIVATE */
png_do_write_transformations(png_structrp png_ptr, png_row_infop row_info)
{
png_debug(1, "in png_do_write_transformations");
if (png_ptr == NULL)
return;
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
if (png_ptr->write_user_transform_fn != NULL)
(*(png_ptr->write_user_transform_fn)) /* User write transform
function */
(png_ptr, /* png_ptr */
row_info, /* row_info: */
/* png_uint_32 width; width of row */
/* size_t rowbytes; number of bytes in row */
/* png_byte color_type; color type of pixels */
/* png_byte bit_depth; bit depth of samples */
/* png_byte channels; number of channels (1-4) */
/* png_byte pixel_depth; bits per pixel (depth*channels) */
png_ptr->row_buf + 1); /* start of pixel data for row */
#endif
#ifdef PNG_WRITE_FILLER_SUPPORTED
if ((png_ptr->transformations & PNG_FILLER) != 0)
png_do_strip_channel(row_info, png_ptr->row_buf + 1,
!(png_ptr->flags & PNG_FLAG_FILLER_AFTER));
#endif
#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
png_do_packswap(row_info, png_ptr->row_buf + 1);
#endif
#ifdef PNG_WRITE_PACK_SUPPORTED
if ((png_ptr->transformations & PNG_PACK) != 0)
png_do_pack(row_info, png_ptr->row_buf + 1,
(png_uint_32)png_ptr->bit_depth);
#endif
#ifdef PNG_WRITE_SWAP_SUPPORTED
# ifdef PNG_16BIT_SUPPORTED
if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
png_do_swap(row_info, png_ptr->row_buf + 1);
# endif
#endif
#ifdef PNG_WRITE_SHIFT_SUPPORTED
if ((png_ptr->transformations & PNG_SHIFT) != 0)
png_do_shift(row_info, png_ptr->row_buf + 1,
&(png_ptr->shift));
#endif
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0)
png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1);
#endif
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1);
#endif
#ifdef PNG_WRITE_BGR_SUPPORTED
if ((png_ptr->transformations & PNG_BGR) != 0)
png_do_bgr(row_info, png_ptr->row_buf + 1);
#endif
#ifdef PNG_WRITE_INVERT_SUPPORTED
if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
png_do_invert(row_info, png_ptr->row_buf + 1);
#endif
}
#endif /* WRITE_TRANSFORMS */
#endif /* WRITE */

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