Decode images only up to a maximum size #884
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Decoding very large images may lead to memory warnings or even crashes. This pull request introduces a new property
maxImageSizeonSDImageCachethat is used for all image decoding operations.[UImage +decodedImageWithImage:maxSize:]will detect if the undecoded image's size exceeds the maximum size, and scale it down, respecting the aspect ratio. Only if the image is downscaled, the context's interpolation quality is adjustedCGContextSetInterpolationQuality(context, kCGInterpolationHigh)to prevent staggering (see http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/)