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| | | + (BOOL)CGImageContainsAlpha:(_Nonnull CGImageRef)cgImage; |
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| | | |
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| | | /** |
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| | | Detect whether the CGImage is lazy and not-yet decoded. (lazy means, only when the caller access the underlying bitmap buffer via provider like `CGDataProviderCopyData` or `CGDataProviderRetainBytePtr`, the decoder will allocate memory, it's a lazy allocation) |
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| | | The implementation use the Core Graphics internal to check whether the CGImage is `CGImageProvider` based, or `CGDataProvider` based. The `CGDataProvider` based is treated as non-lazy. |
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| | | */ |
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| | | + (BOOL)CGImageIsLazy:(_Nonnull CGImageRef)cgImage; |
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| | | |
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| | | /** |
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| | | Create a decoded CGImage by the provided CGImage. This follows The Create Rule and you are response to call release after usage. |
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| | | It will detect whether image contains alpha channel, then create a new bitmap context with the same size of image, and draw it. This can ensure that the image do not need extra decoding after been set to the imageView. |
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| | | @note This actually call `CGImageCreateDecoded:orientation:` with the Up orientation. |
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