21575 2008-10-13 12:26:29 -0700 Cairo's ImageBuffer::getImageData() does not handle alpha=0 case correctly 2009-02-03 11:51:55 -0800 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) Mac OS X 10.5 RESOLVED FIXED P2 Normal --- 1 eroman webkit-unassigned krit oliver oldest_to_newest 95191 0 eroman 2008-10-13 12:26:29 -0700 Cairo buffer data is stored in ARGB, and the following loop in ImageBufferCairo.cpp converts it to RGBA: if (unsigned int alpha = (*pixel & 0xff000000) >> 24) { destRows[basex] = (*pixel & 0x00ff0000) >> 16; destRows[basex + 1] = (*pixel & 0x0000ff00) >> 8; destRows[basex + 2] = (*pixel & 0x000000ff); destRows[basex + 3] = alpha; } else reinterpret_cast<uint32_t*>(destRows + basex)[0] = pixel[0]; The else clause looks suspicious, as it is assigning a ARGB value to where RGBA is expected. So instead of RGB0 you get 0RGB. 95193 1 eroman 2008-10-13 12:29:16 -0700 There is also concern of endianness with how color components are extracted from uint32. 95195 2 krit 2008-10-13 12:31:39 -0700 Need to respect premultiplied colors: destRows[basex] = ((*pixel & 0x00ff0000) >> 16) * 255 / alpha; destRows[basex + 1] = ((*pixel & 0x0000ff00) >> 8) * 255 / alpha; destRows[basex + 2] = ((*pixel & 0x000000ff)) * 255 / alpha; destRows[basex + 3] = alpha; (the same on putImageData) 95223 3 24331 krit 2008-10-13 15:46:52 -0700 Created attachment 24331 imageData This corrects the bugs and adds support for premultiplied colors. Todo: make it endian-save 96961 4 24743 krit 2008-10-29 03:25:29 -0700 Created attachment 24743 canvas-getImageData.html output This is the output of canvas-getImageData.html after applying the patch. Like you can see many tests fail, because alpha channel is 1 "degree" lower than it should be. And perhaps thats why the other colors are wrong too. Because we use the alpha to get premultiplied colors. 97062 5 24758 krit 2008-10-29 15:55:19 -0700 Created attachment 24758 color's given to GraphicsContext I checked the color that are given to GraphicsContext. I added the original alpha value on fist column and the second column includes the alpha multiplied with 255. As you can see (if you compare the values of the first list with the values of the second list): cairo gives the right values back (for the alpha channel). That means first: There is something wrong in Color.cpp and second: it shouldn't work on Cg either. 107839 6 27216 krit 2009-01-31 07:19:33 -0800 Created attachment 27216 imageData respects pre-multiplied colors This fixes the pre-multiplied colors bug, as well as the alpha=0 case. It reads the colors, given to the context, correctly but fails on the canvas-getImageData test. But the fact, that the context gets the wrong color and getImageData reads exactly this color-settings, tells that getImageData works correctly. (see https://bugs.webkit.org/show_bug.cgi?id=22150) You can see the results of the test on the second attachment and the alpha of the colors, given to the context and therefor to the ImageBuffer, on the third attachement. You'll see, that the alpha channel is identical. (Haven't added all colors, but the result is the same) This patch passes canvas-putImageData. I talked about platform dependencies on IRC (#cairo). And they assure me, that this code is already endian safe. 107957 7 27216 zecke 2009-02-02 06:08:32 -0800 Comment on attachment 27216 imageData respects pre-multiplied colors Looks good. The +254 needs some thinking but I see where you got this code from (ImageBufferCG.cpp) 108136 8 krit 2009-02-03 11:51:55 -0800 landed in r40542 24331 2008-10-13 15:46:52 -0700 2009-01-31 07:19:33 -0800 imageData imageData.patch text/plain 2101 krit SW5kZXg6IFdlYkNvcmUvcGxhdGZvcm0vZ3JhcGhpY3MvY2Fpcm8vSW1hZ2VCdWZmZXJDYWlyby5j cHAKPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PQotLS0gV2ViQ29yZS9wbGF0Zm9ybS9ncmFwaGljcy9jYWlyby9JbWFnZUJ1 ZmZlckNhaXJvLmNwcAkocmV2aXNpb24gMzc1NjMpCisrKyBXZWJDb3JlL3BsYXRmb3JtL2dyYXBo aWNzL2NhaXJvL0ltYWdlQnVmZmVyQ2Fpcm8uY3BwCSh3b3JraW5nIGNvcHkpCkBAIC0xMzcsMTIg KzEzNywxNiBAQCBQYXNzUmVmUHRyPEltYWdlRGF0YT4gSW1hZ2VCdWZmZXI6OmdldEltCiAgICAg ICAgICAgICB1aW50MzJfdCAqcGl4ZWwgPSAodWludDMyX3QgKikgcm93ICsgeCArIG9yaWdpbng7 CiAgICAgICAgICAgICBpbnQgYmFzZXggPSB4ICogNDsKICAgICAgICAgICAgIGlmICh1bnNpZ25l ZCBpbnQgYWxwaGEgPSAoKnBpeGVsICYgMHhmZjAwMDAwMCkgPj4gMjQpIHsKKyAgICAgICAgICAg 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