dep: Add libpng 1.6.43

dep/libpng/CMakeLists.txt

@@ -0,0 +1,39 @@
+add_library(png
+  src/png.c
+  src/pngerror.c
+  src/pngget.c
+  src/pngmem.c
+  src/pngpread.c
+  src/pngread.c
+  src/pngrio.c
+  src/pngrtran.c
+  src/pngrutil.c
+  src/pngset.c
+  src/pngtrans.c
+  src/pngwio.c
+  src/pngwrite.c
+  src/pngwtran.c
+  src/pngwutil.c
+)
+
+if(CPU_ARCH_X64)
+  target_sources(png PRIVATE
+    src/intel/filter_sse2_intrinsics.c
+    src/intel/intel_init.c
+  )
+  target_compile_definitions(png PRIVATE "PNG_INTEL_SSE")
+elseif(CPU_ARCH_ARM32 OR CPU_ARCH_ARM64)
+  target_sources(png PRIVATE
+    src/arm/arm_init.c
+    src/arm/filter_neon.S
+    src/arm/filter_neon_intrinsics.c
+    src/arm/palette_neon_intrinsics.c
+  )
+endif()
+
+target_link_libraries(png PRIVATE ZLIB::ZLIB)
+target_include_directories(png PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")
+target_include_directories(png PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/src")
+disable_compiler_warnings_for_target(png)
+
+add_library(PNG::PNG ALIAS png)