函数 doPremultiplyAlpha

doPremultiplyAlpha(
    device: GPUDevice,
    tex: WebGPUInternalTex,
    xOffset: number,
    yOffset: number,
    width: number,
    height: number,
): void
对贴图中的像素做预乘处理
参数
- device: GPUDevice
  A GPUDevice
- tex: WebGPUInternalTex
  The texture to premultiply Alpha
- xOffset: number
  horizon offset
- yOffset: number
  vertical offset
- width: number
- height: number
返回 void
- 定义于 src/layaAir/laya/RenderDriver/WebGPUDriver/RenderDevice/Utils/PreMultiplyAlpha.ts:169