[Image] Fix invalid CGContext when one dimension of destination Image size == 0 #2278
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When an image has a known width, but a height of 0 (which can happen if `flex: 1` is set on the `Image` element), `RCTDownloadManager` attempts to scale it to an invalid size, which results in a `NULL` `CGContextRef` and some scary warnings from UIKit: ``` <Error>: CGContextTranslateCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. ``` This adds a check for zero width or height to the `RCTClipRect` function. If either dimension is zero, it is calculated based on the aspect ratio of the source image. This ensures that we don't try to create an invalid `CGContextRef`, and that images with an unknown dimension are still scaled, blended, etc.
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Addresses #1534
When an image has a known width, but a height of 0 (which can happen if
flex: 1is set on theImageelement),RCTDownloadManagerattempts to scale it to an invalid size, which results in aNULLCGContextRefand some scary warnings from UIKit:This adds a check for zero width or height to the
RCTClipRectfunction. If either dimension is zero, it is calculated based on the aspect ratio of the source image. This ensures that we don't try to create an invalidCGContextRef, and that images with an unknown dimension are still scaled, blended, etc.