ImguiManager: Only rasterize font awesome glyphs which we need

scripts/generate_update_fa_glyph_ranges.py

@@ -0,0 +1,80 @@
+import sys
+import os
+import glob
+import re
+
+#src_file = "src/duckstation-qt/qttranslations.cpp"
+src_dir = os.path.join(os.path.dirname(__file__), "..", "src")
+fa_file = os.path.join(os.path.dirname(__file__), "..", "dep", "imgui", "include", "IconsFontAwesome5.h")
+dst_file = os.path.join(os.path.dirname(__file__), "..", "src", "frontend-common", "imgui_manager.cpp")
+
+all_source_files = glob.glob(os.path.join(src_dir, "**", "*.cpp"), recursive=True) + \
+    glob.glob(os.path.join(src_dir, "**", "*.h"), recursive=True) + \
+    glob.glob(os.path.join(src_dir, "**", "*.inl"), recursive=True)
+
+tokens = set()
+for filename in all_source_files:
+    data = None
+    with open(filename, "r") as f:
+        try:
+            data = f.read()
+        except:
+            continue
+    
+    tokens = tokens.union(set(re.findall("(ICON_FA_[a-zA-Z0-9_]+)", data)))
+
+print("{} tokens found.".format(len(tokens)))
+if len(tokens) == 0:
+    sys.exit(0)
+
+u8_encodings = {}
+with open(fa_file, "r") as f:
+    for line in f.readlines():
+        match = re.match("#define (ICON_FA_[^ ]+) \"([^\"]+)\"", line)
+        if match is None:
+            continue
+        u8_encodings[match[1]] = bytes.fromhex(match[2].replace("\\x", ""))
+
+out_pattern = "(static constexpr ImWchar range_fa\[\] = \{)[0-9A-Z_a-z, \n]+(\};)"
+
+codepoints = list()
+for token in tokens:
+    u8_bytes = u8_encodings[token]
+    u8 = str(u8_bytes, "utf-8")
+    u16 = u8.encode("utf-16le")
+    if len(u16) > 2:
+        raise ValueError("{} too long".format(u8_bytes))
+
+    codepoint = int.from_bytes(u16, byteorder="little", signed=False)
+    codepoints.append(codepoint)
+codepoints.sort()
+codepoints.append(0) # null terminator
+
+startc = None
+endc = None
+pairs = []
+for codepoint in codepoints:
+    if endc is not None and (endc + 1) != codepoint:
+        if startc is not None:
+            pairs.append(startc)
+            pairs.append(endc)
+        startc = codepoint
+        endc = codepoint
+    else:
+        endc = codepoint
+if startc is not None:
+    pairs.append(startc)
+    pairs.append(endc)
+
+pairs_str = ",".join(list(map(lambda x: "0x{:x}".format(x), pairs)))
+
+with open(dst_file, "r") as f:
+    original = f.read()
+    updated = re.sub(out_pattern, "\\1 " + pairs_str + " \\2", original)
+    if original != updated:
+        with open(dst_file, "w") as f:
+            f.write(updated)
+            print("Updated {}".format(dst_file))
+    else:
+        print("Skipping updating {}".format(dst_file))
+