148 lines
5.0 KiB
Python
148 lines
5.0 KiB
Python
"""
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用 PIL 渲染 ASCII 像素风位图字体图集。
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用法:
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python tools/gen_font_atlas.py [output_dir]
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默认输出目录: assets/font/
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生成: font_atlas.png, font_atlas.h
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字符范围: ASCII 32~126
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字体: 优先使用 assets/font/ndrtyyl-prqyys-undertale-hebrew-uppercase.ttf，
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不存在时回退到系统等宽字体（Courier New / Consolas / monospace）
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输出格式: 1-bit row-major bit-packed mask（MSB-first）
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生成端会把 alpha 阈值化为 0/255，再将整张 atlas 逐行打包成遮罩位图。
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"""
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import os
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import sys
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from PIL import Image, ImageDraw, ImageFont
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FIRST_CHAR = 32
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LAST_CHAR = 126
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NUM_CHARS = LAST_CHAR - FIRST_CHAR + 1 # 95
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COLUMNS = 16
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ROWS = (NUM_CHARS + COLUMNS - 1) // COLUMNS # 6
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def find_mono_font(size: int) -> ImageFont.FreeTypeFont:
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repo_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
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candidates = [
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os.path.join(repo_root, "assets/font", "ndrtyyl-prqyys-undertale-hebrew-uppercase.ttf"),
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"C:/Windows/Fonts/consola.ttf", # Consolas (Windows)
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"C:/Windows/Fonts/cour.ttf", # Courier New (Windows)
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"/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf", # Linux
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"/usr/share/fonts/truetype/liberation/LiberationMono-Regular.ttf",
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]
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for path in candidates:
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if os.path.exists(path):
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return ImageFont.truetype(path, size)
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return ImageFont.load_default()
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def generate(output_dir: str):
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font = find_mono_font(14)
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# 测量完整 ASCII 字符集的尺寸。
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# 不能只用 "M"：它没有下伸部，按它算高度会裁掉 g/j/p/q/y/_ 等字符。
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tmp_img = Image.new("RGBA", (1, 1))
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tmp_draw = ImageDraw.Draw(tmp_img)
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chars = [chr(FIRST_CHAR + i) for i in range(NUM_CHARS)]
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bboxes = [tmp_draw.textbbox((0, 0), ch, font=font) for ch in chars]
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pad = 1
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min_left = min(b[0] for b in bboxes)
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min_top = min(b[1] for b in bboxes)
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max_right = max(b[2] for b in bboxes)
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max_bottom = max(b[3] for b in bboxes)
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# 等宽字体仍使用统一 cell。宽度用字体 advance，避免窄字符影响字距；
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# 高度用全字符 bbox，保证下伸字符不被裁切。
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max_advance = max(tmp_draw.textlength(ch, font=font) for ch in chars)
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char_w = int(max_advance + 0.9999) + pad * 2
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char_h = (max_bottom - min_top) + pad * 2
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atlas_w = COLUMNS * char_w
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atlas_h = ROWS * char_h
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img = Image.new("RGBA", (atlas_w, atlas_h), (0, 0, 0, 0))
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draw = ImageDraw.Draw(img)
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for i in range(NUM_CHARS):
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ch = chr(FIRST_CHAR + i)
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col = i % COLUMNS
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row = i // COLUMNS
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x = col * char_w + pad - min_left
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y = row * char_h + pad - min_top
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draw.text((x, y), ch, fill=(255, 255, 255, 255), font=font)
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# 像素风：把 TrueType 抗锯齿 alpha 二值化。
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# 渲染端目前只判断 alpha 是否非 0；如果保留半透明边缘，会被画成实心像素导致发胖/毛边。
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threshold = 128
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for py in range(atlas_h):
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for px in range(atlas_w):
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_, _, _, a = img.getpixel((px, py))
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img.putpixel((px, py), (255, 255, 255, 255) if a >= threshold else (0, 0, 0, 0))
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png_path = os.path.join(output_dir, "font_atlas.png")
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img.save(png_path)
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mask_bits = []
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packed = 0
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bit_count = 0
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for y in range(atlas_h):
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for x in range(atlas_w):
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_, _, _, a = img.getpixel((x, y))
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packed = (packed << 1) | (1 if a != 0 else 0)
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bit_count += 1
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if bit_count == 8:
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mask_bits.append(packed)
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packed = 0
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bit_count = 0
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if bit_count != 0:
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mask_bits.append(packed << (8 - bit_count))
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h_path = os.path.join(output_dir, "font_atlas.h")
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with open(h_path, "w", encoding="utf-8") as f:
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f.write("// Auto-generated by tools/gen_font_atlas.py\n")
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f.write("#pragma once\n#include <cstdint>\n\n")
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f.write(f"static const int32_t font_atlas_width = {atlas_w};\n")
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f.write(f"static const int32_t font_atlas_height = {atlas_h};\n")
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f.write(f"static const int32_t font_char_w = {char_w};\n")
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f.write(f"static const int32_t font_char_h = {char_h};\n")
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f.write(f"static const int32_t font_first_char = {FIRST_CHAR};\n")
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f.write(f"static const int32_t font_columns = {COLUMNS};\n\n")
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f.write(f"static const uint8_t font_atlas_mask[] = {{\n")
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for i in range(0, len(mask_bits), 16):
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chunk = mask_bits[i:i + 16]
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line = ", ".join(f"0x{value:02X}" for value in chunk)
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f.write(f" {line},\n")
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f.write("};\n")
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print(f"Atlas: {atlas_w}x{atlas_h}, char: {char_w}x{char_h}")
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print(f"Generated: {png_path}, {h_path}")
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def main():
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if len(sys.argv) >= 2:
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out_dir = sys.argv[1]
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else:
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out_dir = os.path.join(
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os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
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"assets", "font"
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)
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os.makedirs(out_dir, exist_ok=True)
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generate(out_dir)
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if __name__ == "__main__":
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main()
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