为 LightGame 提供素材转换工具和转换后的头文件

tools/pack_sprite_atlas.py

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+"""
+将多个独立 sprite PNG 按 JSON 配置打包为 sprite atlas，生成 C++ header。
+
+用法:
+    python tools/pack_sprite_atlas.py config.json output.h
+
+JSON 格式:
+{
+    "atlas_width": 512,
+    "atlas_height": 512,
+    "sprites": [
+        { "name": "player_idle_0", "file": "player_idle_0.png" },
+        { "name": "player_idle_1", "file": "player_idle_1.png" },
+        ...
+    ]
+}
+
+- atlas_width / atlas_height: 输出 atlas 尺寸
+- sprites: 按顺序排列的 sprite 列表
+- 每个 sprite 保持原始尺寸，从左到右、从上到下排列
+- 生成的 header 包含每个 sprite 的子矩形信息
+"""
+
+import json
+import os
+import sys
+
+from PIL import Image
+
+
+def pack(config_path: str, output_path: str):
+    config_dir = os.path.dirname(os.path.abspath(config_path))
+
+    with open(config_path, "r", encoding="utf-8") as f:
+        cfg = json.load(f)
+
+    atlas_w = cfg["atlas_width"]
+    atlas_h = cfg["atlas_height"]
+    sprites = cfg["sprites"]
+
+    atlas = Image.new("RGBA", (atlas_w, atlas_h), (0, 0, 0, 0))
+
+    regions = []
+    cursor_x = 0
+    cursor_y = 0
+    row_height = 0
+
+    for s in sprites:
+        png_path = os.path.join(config_dir, s["file"])
+        img = Image.open(png_path).convert("RGBA")
+        w, h = img.size
+
+        if cursor_x + w > atlas_w:
+            cursor_x = 0
+            cursor_y += row_height
+            row_height = 0
+
+        if cursor_y + h > atlas_h:
+            print(f"错误: atlas 空间不足，sprite '{s['name']}' 放不下")
+            sys.exit(1)
+
+        atlas.paste(img, (cursor_x, cursor_y))
+        regions.append({
+            "name": s["name"],
+            "x": cursor_x,
+            "y": cursor_y,
+            "w": w,
+            "h": h,
+        })
+
+        cursor_x += w
+        row_height = max(row_height, h)
+
+    var_name = os.path.splitext(os.path.basename(output_path))[0]
+
+    pixels = list(atlas.getdata())
+    packed = []
+    for r, g, b, a in pixels:
+        packed.append(
+            ((r >> 3) << 11)
+            | ((g >> 3) << 6)
+            | ((b >> 3) << 1)
+            | (1 if a else 0)
+        )
+
+    with open(output_path, "w", encoding="utf-8") as f:
+        f.write("// Auto-generated by tools/pack_sprite_atlas.py\n")
+        f.write(f"#pragma once\n#include <cstdint>\n#include \"Image.h\"\n#include \"Sprite.h\"\n\n")
+        f.write(f"namespace {var_name} {{\n\n")
+        f.write(f"static const int32_t atlas_width = {atlas_w};\n")
+        f.write(f"static const int32_t atlas_height = {atlas_h};\n\n")
+        f.write(f"static const uint16_t atlas_pixels[] = {{\n")
+
+        for i in range(0, len(packed), 16):
+            chunk = packed[i : i + 16]
+            line = ", ".join(f"0x{p:04X}" for p in chunk)
+            f.write(f"    {line},\n")
+
+        f.write("};\n\n")
+        f.write(f"static const RenderData::Image atlas_image(atlas_pixels, atlas_width, atlas_height);\n\n")
+
+        for r in regions:
+            f.write(f"static const RenderData::Sprite spr_{r['name']}("
+                    f"&atlas_image, {r['x']}, {r['y']}, {r['w']}, {r['h']});\n")
+
+        f.write(f"\n}} // namespace {var_name}\n")
+
+    print(f"已生成: {output_path}")
+    print(f"  atlas: {atlas_w}x{atlas_h}, {len(regions)} sprites")
+    for r in regions:
+        print(f"    {r['name']}: ({r['x']},{r['y']}) {r['w']}x{r['h']}")
+
+
+def main():
+    if len(sys.argv) < 3:
+        print(f"用法: {sys.argv[0]} config.json output.h")
+        sys.exit(1)
+
+    pack(sys.argv[1], sys.argv[2])
+
+
+if __name__ == "__main__":
+    main()