feat(brand): 应用图标、开屏资源与品牌字体切换为 ymb

2026-10-30 17:14:27 +08:00
1 parent 26321e3348
commit 22cc669bbe
@@ -0,0 +1,142 @@
+# Author: fruit.com.cn
+"""使用确认的 ymb 原图生成图标、启动标识及原生平台尺寸。"""
+
+import json
+from pathlib import Path
+
+from PIL import Image, ImageChops, ImageDraw
+
+ROOT = Path(__file__).resolve().parents[1]
+ASSETS = ROOT / "assets/icon"
+IOS = ROOT / "ios/Runner/Assets.xcassets"
+ANDROID = ROOT / "android/app/src/main/res"
+REFERENCE = ROOT / "assets/branding/ymb-reference.png"
+LAUNCH_REFERENCE = ROOT / "assets/branding/ymb-launch-reference.png"
+BRAND_RED = "#E9142E"
+WHITE = "#FFFFFF"
+CLEAR = (0, 0, 0, 0)
+MASTER_SIZE = 1024
+SPLASH_SIZE = 80
+SPLASH_RADIUS = 18
+ANDROID12_SIZE = 288
+FOREGROUND_SIZE = 108
+LEGACY_SIZE = 48
+PLACEHOLDER_SIZE = (600, 360)
+LAUNCH_SIZE = (390, 844)
+WHITE_THRESHOLD = 100
+WHITE_RANGE = 145
+DENSITIES = {"mdpi": 1, "hdpi": 1.5, "xhdpi": 2, "xxhdpi": 3, "xxxhdpi": 4}
+RESAMPLE = Image.Resampling.LANCZOS
+
+
+def wordmark(reference):
+    """从原图白色字标提取透明前景，不重新绘制或改变字形。"""
+    channels = reference.convert("RGB").split()
+    lightness = ImageChops.darker(ImageChops.darker(*channels[:2]), channels[2])
+    alpha = lightness.point(
+        lambda value: max(0, min(255, round(
+            (value - WHITE_THRESHOLD) * 255 / WHITE_RANGE
+        )))
+    )
+    image = Image.new("RGBA", reference.size, WHITE)
+    image.putalpha(alpha)
+    return image
+
+
+def centered(canvas, mark):
+    """将标识按可见边界居中，不包含字体基线额外留白。"""
+    origin = ((canvas.width - mark.width) // 2, (canvas.height - mark.height) // 2)
+    canvas.alpha_composite(mark, origin)
+    return canvas
+
+
+def scaled_wordmark(mark, width):
+    """等比缩放字标，所有输出共用同一字形。"""
+    height = round(mark.height * width / mark.width)
+    return mark.resize((width, height), RESAMPLE)
+
+
+def splash_icon(master, size):
+    """仅启动图烘焙圆角；桌面图标保留系统负责的裁切。"""
+    image = master.resize((size, size), RESAMPLE).convert("RGBA")
+    mask = Image.new("L", (MASTER_SIZE, MASTER_SIZE))
+    radius = MASTER_SIZE * SPLASH_RADIUS / SPLASH_SIZE
+    ImageDraw.Draw(mask).rounded_rectangle(
+        (0, 0, MASTER_SIZE - 1, MASTER_SIZE - 1), radius=radius, fill=255
+    )
+    image.putalpha(mask.resize((size, size), RESAMPLE))
+    return image
+
+
+def save(image, target):
+    """写入明确路径的生成资源，不清理或删除目录。"""
+    target.parent.mkdir(parents=True, exist_ok=True)
+    image.save(target, optimize=True)
+
+
+def ios_assets(master):
+    """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。"""
+    app_icons = IOS / "AppIcon.appiconset"
+    manifest = json.loads((app_icons / "Contents.json").read_text())
+    for entry in manifest["images"]:
+        points = float(entry["size"].split("x")[0])
+        scale = int(entry["scale"].removesuffix("x"))
+        pixels = round(points * scale)
+        save(master.resize((pixels, pixels), RESAMPLE), app_icons / entry["filename"])
+    for scale in (1, 2, 3):
+        suffix = "" if scale == 1 else f"@{scale}x"
+        size = tuple(value * scale for value in LAUNCH_SIZE)
+        image = Image.open(LAUNCH_REFERENCE).convert("RGB").resize(size, RESAMPLE)
+        save(image, IOS / f"LaunchImage.imageset/LaunchImage{suffix}.png")
+
+
+def android_assets(master, foreground):
+    """覆盖现有密度资源，并为 Android 12 提供独立安全区标识。"""
+    for density, scale in DENSITIES.items():
+        pixels = round(LEGACY_SIZE * scale)
+        save(
+            master.resize((pixels, pixels), RESAMPLE),
+            ANDROID / f"mipmap-{density}/ic_launcher.png",
+        )
+        pixels = round(FOREGROUND_SIZE * scale)
+        save(
+            foreground.resize((pixels, pixels), RESAMPLE),
+            ANDROID / f"drawable-{density}/ic_launcher_foreground.png",
+        )
+        save(
+            Image.new("RGB", (pixels, pixels), BRAND_RED),
+            ANDROID / f"mipmap-{density}/ic_launcher_background.png",
+        )
+        mark = splash_icon(master, round(SPLASH_SIZE * scale))
+        save(mark, ANDROID / f"drawable-{density}/splash_screen.png")
+        size = round(ANDROID12_SIZE * scale)
+        image = centered(Image.new("RGBA", (size, size), CLEAR), mark)
+        save(image, ANDROID / f"drawable-{density}/android12splash.png")
+
+
+def main():
+    """直接复用确认的原始图标和开屏，输出平台所需尺寸。"""
+    reference = Image.open(REFERENCE).convert("RGB")
+    master = reference.resize((MASTER_SIZE, MASTER_SIZE), RESAMPLE)
+    mark = wordmark(reference)
+    foreground = mark.resize((MASTER_SIZE, MASTER_SIZE), RESAMPLE)
+    save(master, ASSETS / "ymb.png")
+    save(foreground, ASSETS / "ymb_foreground.png")
+    placeholder = centered(
+        Image.new("RGBA", PLACEHOLDER_SIZE, CLEAR),
+        scaled_wordmark(mark.crop(mark.getbbox()), PLACEHOLDER_SIZE[0]),
+    )
+    save(placeholder, ASSETS / "splash_logo.png")
+    icon = splash_icon(master, SPLASH_SIZE * 4)
+    size = ANDROID12_SIZE * 4
+    save(
+        centered(Image.new("RGBA", (size, size), CLEAR), icon),
+        ASSETS / "ymb_android12.png",
+    )
+    ios_assets(master)
+    android_assets(master, foreground)
+    print("Generated ymb assets: master 1024, iOS catalog, Android 5 densities.")
+
+
+if __name__ == "__main__":
+    main()