With PNG-compressed images, you do not provide the mask at all; the mask is derived from the alpha channel on the fly.
用了PNG格式的图像，你不再需要提供mask了。 mask自然而然的由PNG的透明通道提供。
With PNG-compressed images, you do not provide the mask at all; the mask is derived from the alpha channel on the fly.
用了PNG格式的图像，你不再需要提供mask了。 mask自然而然的由PNG的透明通道提供。
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