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
Starting with bug 391583 we detect whether a png image has any transparency during decode. I don't think this is worth doing anymore. We choose the format of image based on the png header, that should be sufficient for the performance improvement we desire from opaque images. This gets us faster image decoding. --HG-- extra : rebase_source : 7233c03e9e4fd0987f3e7c12d5d0e27520ebddae