perf: 优化合图功能

src/types/upng-js.d.ts

@@ -0,0 +1,54 @@
+declare module "upng-js" {
+  /**
+   * Encode RGBA image data to PNG
+   * @param imgs Array of ArrayBuffer containing RGBA data
+   * @param w Width of the image
+   * @param h Height of the image
+   * @param cnum Number of colors (0 = lossless, 256 = 8-bit quantization)
+   * @param dels Optional delays for APNG frames
+   * @returns ArrayBuffer containing PNG data
+   */
+  export function encode(
+    imgs: ArrayBuffer[],
+    w: number,
+    h: number,
+    cnum: number,
+    dels?: number[]
+  ): ArrayBuffer;
+
+  /**
+   * Decode PNG to RGBA image data
+   * @param buffer PNG data
+   * @returns Decoded image info
+   */
+  export function decode(buffer: ArrayBuffer): {
+    width: number;
+    height: number;
+    depth: number;
+    ctype: number;
+    frames: Array<{
+      rect: { x: number; y: number; width: number; height: number };
+      delay: number;
+      dispose: number;
+      blend: number;
+    }>;
+    tabs: Record<string, unknown>;
+    data: Uint8Array;
+  };
+
+  /**
+   * Convert decoded PNG to RGBA format
+   * @param img Decoded image from decode()
+   * @param frameIndex Frame index for APNG (default 0)
+   * @returns Uint8Array of RGBA data
+   */
+  export function toRGBA8(img: ReturnType<typeof decode>, frameIndex?: number): Uint8Array[];
+
+  const UPNG: {
+    encode: typeof encode;
+    decode: typeof decode;
+    toRGBA8: typeof toRGBA8;
+  };
+
+  export default UPNG;
+}