17284 2008-02-10 08:49:34 -0800 [CAIRO] Introduce single-pixel image optimizations 2009-03-11 10:48:00 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) All All RESOLVED FIXED Cairo, Gtk P2 Minor --- 1 alp webkit-unassigned oldest_to_newest 70054 0 alp 2008-02-10 08:49:34 -0800 Single-pixel optimizations are not yet implemented and can be useful for speeding up pathological cases like single-pixel GIFs used as padding. While at it, we can consider borrowing some of the techniques recently developed by these guys: https://bugzilla.mozilla.org/show_bug.cgi?id=371867 https://bugzilla.mozilla.org/show_bug.cgi?id=415854 111871 1 28192 krit 2009-03-02 12:11:44 -0800 Created attachment 28192 single pixel optimization implementation of checkForSolidColor for Cairo after Adam Treat s patch: r41358. 111889 2 28192 eric 2009-03-02 13:21:30 -0800 Comment on attachment 28192 single pixel optimization I don't really know enough about Cairo to know if your color extraction code is correct. I think I would have abstracted it into a nice little static function though: uint32_t* pixel = reinterpret_cast<uint32_t*>(data); 208 int alpha, red, green, blue; 209 210 if (alpha = (*pixel & 0xff000000) >> 24) { 211 red = ((*pixel & 0x00ff0000) >> 16) * 255 / alpha; 212 green = ((*pixel & 0x0000ff00) >> 8) * 255 / alpha; 213 blue = (*pixel & 0x000000ff) * 255 / alpha; 214 } else { 215 red = (*pixel & 0x00ff0000) >> 16; 216 green = (*pixel & 0x0000ff00) >> 8; 217 blue = (*pixel & 0x000000ff); 218 } Color color = colorFromCairoPixel(*pixel); I think someone who knows more about Cairo should comment before I can mark this r+. Also... is (*pixel & 0xff000000) >> 24) the cleanest way to get the alpha out of a cairo pixel? Talk about ugly, error-prone math... I think actually I'm going to r- for the way you grab colors out of the pixel. Even if that's the only way, we should make those static inlines so that they're not so error prone. 111994 3 28221 krit 2009-03-03 08:30:23 -0800 Created attachment 28221 single pixel optimization with CairoColor I talked to eseidel in IRC and he mentioned to add a new typedef or somthing like that to avoid failured and make the code reading better. I added a new color schema to Cairo: CairoColor. CairoColor attends to premultiplying and every other calculation. I added some small callers to have access to the color values of a pixel. You can easily get the unpremutiplied colors of a pixel or set them by adding unpremultiplied colors. We just support image surfaces with 32bit for now. There are asserts before every direct manipulation of surfaces. But I don't see a problem to support other surfaces in the future if wanted. 112258 4 28279 krit 2009-03-04 12:11:11 -0800 Created attachment 28279 single pixel optimization with CairoColor this patch doesn't add a new class but uses Color.cpp instead. 112377 5 28302 krit 2009-03-05 08:33:29 -0800 Created attachment 28302 single pixel optimization with Color just added two calls to premultiply or unpremultiply the color of a pixel to Color.cpp. 112422 6 28302 eric 2009-03-05 12:25:57 -0800 Comment on attachment 28302 single pixel optimization with Color halves, not halfes 148 Color colorFromPremultipliedARGB(RGBA32); should use unsigned, not RGBA32 This looks good. It would be nice if someone could check your pixel math before you land. Like Oliver? 113031 7 krit 2009-03-10 11:48:12 -0700 landed in r41561. 113197 8 pam 2009-03-11 10:48:00 -0700 Marking fixed so it drops out of the commit queue. 28192 2009-03-02 12:11:44 -0800 2009-03-03 08:30:23 -0800 single pixel optimization cairo-singlePixel.patch text/plain 2626 krit SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiA0MTM2MikKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMTYgQEAKKzIwMDktMDMtMDIgIERpcmsgU2NodWx6ZSAgPGtyaXRAd2Via2l0Lm9y Zz4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBJbXBs ZW1lbnQgdGhlIENhaXJvIHZlcnNpb24gb2YgdGhlIGNoZWNrRm9yU29saWRDb2xvcigpIG1ldGhv ZC4gVGhpcyBoYWxmZXMgdGhlCisgICAgICAgIHRpbWUgdG8gZHJhdy4KKworICAgICAgICBbQ0FJ Uk9dIEludHJvZHVjZSBzaW5nbGUtcGl4ZWwgaW1hZ2Ugb3B0aW1pemF0aW9ucworICAgICAgICBo dHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTcyODQKKworICAgICAgICAq 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