146 lines
5.3 KiB
Python
146 lines
5.3 KiB
Python
# Author: fruit.com.cn
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"""使用确认的 ymb 原图生成图标、启动标识及原生平台尺寸。"""
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import json
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from pathlib import Path
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from PIL import Image, ImageChops, ImageDraw
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ROOT = Path(__file__).resolve().parents[1]
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ASSETS = ROOT / "assets/icon"
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IOS = ROOT / "ios/Runner/Assets.xcassets"
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ANDROID = ROOT / "android/app/src/main/res"
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REFERENCE = ROOT / "assets/branding/ymb-reference.png"
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LAUNCH_REFERENCE = ROOT / "assets/branding/ymb-launch-reference.png"
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BRAND_BACKGROUND = "#000000"
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WHITE = "#FFFFFF"
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CLEAR = (0, 0, 0, 0)
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MASTER_SIZE = 1024
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SPLASH_SIZE = 80
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SPLASH_RADIUS = 18
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ANDROID12_SIZE = 288
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FOREGROUND_SIZE = 108
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LEGACY_SIZE = 48
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PLACEHOLDER_SIZE = (600, 360)
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LAUNCH_SIZE = (390, 844)
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WHITE_THRESHOLD = 100
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WHITE_RANGE = 145
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DENSITIES = {"mdpi": 1, "hdpi": 1.5, "xhdpi": 2, "xxhdpi": 3, "xxxhdpi": 4}
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RESAMPLE = Image.Resampling.LANCZOS
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def wordmark(reference):
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"""从原图白色字标提取透明前景，不重新绘制或改变字形。"""
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channels = reference.convert("RGB").split()
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lightness = ImageChops.darker(ImageChops.darker(*channels[:2]), channels[2])
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alpha = lightness.point(
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lambda value: max(0, min(255, round(
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(value - WHITE_THRESHOLD) * 255 / WHITE_RANGE
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)))
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)
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image = Image.new("RGBA", reference.size, WHITE)
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image.putalpha(alpha)
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return image
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def centered(canvas, mark):
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"""将标识按可见边界居中，不包含字体基线额外留白。"""
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origin = ((canvas.width - mark.width) // 2, (canvas.height - mark.height) // 2)
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canvas.alpha_composite(mark, origin)
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return canvas
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def scaled_wordmark(mark, width):
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"""等比缩放字标，所有输出共用同一字形。"""
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height = round(mark.height * width / mark.width)
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return mark.resize((width, height), RESAMPLE)
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def splash_icon(master, size):
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"""仅启动图烘焙圆角；桌面图标保留系统负责的裁切。"""
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image = master.resize((size, size), RESAMPLE).convert("RGBA")
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mask = Image.new("L", (MASTER_SIZE, MASTER_SIZE))
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radius = MASTER_SIZE * SPLASH_RADIUS / SPLASH_SIZE
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ImageDraw.Draw(mask).rounded_rectangle(
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(0, 0, MASTER_SIZE - 1, MASTER_SIZE - 1), radius=radius, fill=255
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)
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image.putalpha(mask.resize((size, size), RESAMPLE))
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return image
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def save(image, target):
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"""写入明确路径的生成资源，不清理或删除目录。"""
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target.parent.mkdir(parents=True, exist_ok=True)
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image.save(target, optimize=True)
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def ios_assets(master):
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"""严格按资源目录声明导出图标；开屏保留确认的完整参考图。"""
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app_icons = IOS / "AppIcon.appiconset"
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manifest = json.loads((app_icons / "Contents.json").read_text())
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for entry in manifest["images"]:
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points = float(entry["size"].split("x")[0])
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scale = int(entry["scale"].removesuffix("x"))
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pixels = round(points * scale)
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save(master.resize((pixels, pixels), RESAMPLE), app_icons / entry["filename"])
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for scale in (1, 2, 3):
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suffix = "" if scale == 1 else f"@{scale}x"
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size = tuple(value * scale for value in LAUNCH_SIZE)
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image = Image.open(LAUNCH_REFERENCE).convert("RGB").resize(size, RESAMPLE)
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save(image, IOS / f"LaunchImage.imageset/LaunchImage{suffix}.png")
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def android_assets(master, foreground):
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"""覆盖现有密度资源，并为 Android 12 提供独立安全区标识。"""
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for density, scale in DENSITIES.items():
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pixels = round(LEGACY_SIZE * scale)
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save(
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master.resize((pixels, pixels), RESAMPLE),
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ANDROID / f"mipmap-{density}/ic_launcher.png",
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)
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pixels = round(FOREGROUND_SIZE * scale)
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save(
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foreground.resize((pixels, pixels), RESAMPLE),
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ANDROID / f"drawable-{density}/ic_launcher_foreground.png",
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)
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save(
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Image.new("RGB", (pixels, pixels), BRAND_BACKGROUND),
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ANDROID / f"mipmap-{density}/ic_launcher_background.png",
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)
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mark = splash_icon(master, round(SPLASH_SIZE * scale))
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save(mark, ANDROID / f"drawable-{density}/splash_screen.png")
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size = round(ANDROID12_SIZE * scale)
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image = centered(Image.new("RGBA", (size, size), CLEAR), mark)
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save(image, ANDROID / f"drawable-{density}/android12splash.png")
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def main():
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"""直接复用确认的原始图标和开屏，输出平台所需尺寸。"""
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reference = Image.open(REFERENCE).convert("RGB")
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mark = wordmark(reference)
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master = centered(
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Image.new("RGBA", (MASTER_SIZE, MASTER_SIZE), (0, 0, 0, 255)),
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mark.resize((MASTER_SIZE, MASTER_SIZE), RESAMPLE),
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)
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foreground = mark.resize((MASTER_SIZE, MASTER_SIZE), RESAMPLE)
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save(master.convert("RGB"), ASSETS / "ymb.png")
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save(foreground, ASSETS / "ymb_foreground.png")
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placeholder = centered(
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Image.new("RGBA", PLACEHOLDER_SIZE, CLEAR),
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scaled_wordmark(mark.crop(mark.getbbox()), PLACEHOLDER_SIZE[0]),
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)
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save(placeholder, ASSETS / "splash_logo.png")
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icon = splash_icon(master, SPLASH_SIZE * 4)
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size = ANDROID12_SIZE * 4
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save(
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centered(Image.new("RGBA", (size, size), CLEAR), icon),
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ASSETS / "ymb_android12.png",
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)
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ios_assets(master)
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android_assets(master, foreground)
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print("Generated ymb assets: master 1024, iOS catalog, Android 5 densities.")
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if __name__ == "__main__":
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main()
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