40 lines
1.6 KiB
Python
40 lines
1.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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从反白 logo 提取左侧图形生成 favicon（180x180 PNG）：
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深色圆角底（与站内卡片底色一致）+ 图形居中占 72%
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标签栏明暗模式均以深色块呈现，反白图形恒清晰。
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用法: uv run --with pillow python3 tools/make_favicon.py
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"""
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from PIL import Image, ImageDraw
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SRC = 'assets/img/logo-light.png'
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OUT = 'assets/img/favicon.png'
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SIZE = 180
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PAD_GRAPHIC = 0.72 # 图形占画布比例
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# logo 左侧图形实测内容段（x 投影分析）：x[47:224] y[44:260]，取 bbox 略收边
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CROP = (47, 44, 224, 260)
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BG = (7, 11, 22) # 站内 --bg-1
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RADIUS = 38
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graphic = Image.open(SRC).convert('RGBA').crop(CROP)
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canvas = Image.new('RGBA', (SIZE, SIZE), (0, 0, 0, 0))
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# 圆角深色底
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mask = Image.new('L', (SIZE, SIZE), 0)
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ImageDraw.Draw(mask).rounded_rectangle((0, 0, SIZE, SIZE), RADIUS, fill=255)
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canvas.paste(Image.new('RGBA', (SIZE, SIZE), BG + (255,)), (0, 0), mask)
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# 图形等比缩放到 72% 高度内居中
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target = round(SIZE * PAD_GRAPHIC)
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scale = min(target / graphic.width, target / graphic.height)
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graphic = graphic.resize((round(graphic.width * scale), round(graphic.height * scale)), Image.LANCZOS)
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canvas.alpha_composite(graphic, ((SIZE - graphic.width) // 2, (SIZE - graphic.height) // 2))
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# 自检：中心应有不透明图形像素，四角透明
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px = canvas.load()
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assert px[SIZE // 2, SIZE // 2][3] > 0, '中心无图形'
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assert px[2, 2][3] == 0 and px[SIZE - 3, SIZE - 3][3] == 0, '圆角未生效'
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canvas.save(OUT, 'PNG', optimize=True)
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print(f'完成: {OUT} {SIZE}x{SIZE}，图形 {graphic.size}')
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