kc3-lang/angle

2021-10-28T11:01:12

Fix Blitting in Metal backend. The Metal backend was clipping in integer space. If the src and dst are not the same size, say src is 3 wide and dst is 4 wide, and src starts at -1, then src will be clipped by one making the src 2 wide. It got 1/3 smaller so the dst get 1/3 smaller making it 2.666 pixels wide. The dst then needs to be expanded to pixels so 3 wide. But, that means the src also needs to be expanded 0.3333 * 3(originalSrcWidth) / 4(originalDstWidth) so its new left edge is -0.245 which is not an integer. Bug: angleproject:6598 Change-Id: I2faa966b18b457f474a3e7f6844ef64bfa66dbe8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3251683 Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Kyle Piddington <kpiddington@apple.com> Commit-Queue: Gregg Tavares <gman@chromium.org>