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SMasks are greyscale images that get used as alpha channel for a different image. JPEGs in PDFs are stored as streams with /DCTDecode filters, and we have a separate code path for loading those in the PDF renderer. That code path just calls our JPEG decoder, which creates bitmaps with format BGRx8888. So when we process an SMask for such a bitmap, we have to change the bitmap's format to BGRA8888 in addition to setting alpha values on all pixels.