89246 2012-06-15 14:29:32 -0700 [Cairo] do not multiply/demultiply colors when alpha is 255 2012-10-25 13:09:19 -0700 1 1 1 Unclassified WebKit Platform 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED Performance P2 Normal --- 0 a.renevier a.renevier abarth darin dbates d-r igor.oliveira laszlo.gombos mrobinson simon.fraser thorton webkit.review.bot oldest_to_newest 650510 0 a.renevier 2012-06-15 14:29:32 -0700 Hi, currently, when computing color from premultiplied ARGB, and vice/versa (colorFromPremultipliedARGB and premultipliedARGBFromColor functions), the computation is performed if alpha is non 0. But if alpha is 255, computation is the identity computation. So we can avoid this computation in the case alpha is 255. 650517 1 147901 a.renevier 2012-06-15 14:34:17 -0700 Created attachment 147901 patch proposal 654683 2 148836 a.renevier 2012-06-21 10:45:48 -0700 Created attachment 148836 updated patch on top of 89138 654685 3 simon.fraser 2012-06-21 10:47:32 -0700 Is this a measurable perf win on a specific test? 654692 4 a.renevier 2012-06-21 10:53:41 -0700 (In reply to comment #3) > Is this a measurable perf win on a specific test? http://renevier.net/misc/webkit_89246.html tested with GtkLauncher getImageData goes from 275ms to 136ms when alpha is 255 goes from 255ms to 261ms when alpha is 128 putImageData goes from 165ms to 82ms when alpha is 255 goes from 160ms to 165ms when alpha is 128 So, we loose about 3% or 5% speed when there is transparency (may be because of the extra condition check?), but we are twice as fast when there is no transparency. 659775 5 abarth 2012-06-28 13:42:51 -0700 Seems reasonable, but I don't know how to weigh 3-5% loss in the transparent case against the speed win in the opaque case. It's likely someone other than me should review this patch. 660803 6 a.renevier 2012-06-29 14:55:16 -0700 CCing darin as he has reviewed patches in Color.cpp 680672 7 a.renevier 2012-07-27 08:20:39 -0700 Does someone known who could be a good reviewer for this patch ? 680783 8 simon.fraser 2012-07-27 10:28:52 -0700 (In reply to comment #5) > Seems reasonable, but I don't know how to weigh 3-5% loss in the transparent case against the speed win in the opaque case. It's likely someone other than me should review this patch. I don't either. Some perf data from PLT or pages on the web might help. 681012 9 148836 darin 2012-07-27 13:08:37 -0700 Comment on attachment 148836 updated patch on top of 89138 We should only add this code if the speedup is measurable. 681013 10 darin 2012-07-27 13:09:04 -0700 (In reply to comment #9) > We should only add this code if the speedup is measurable. Oh, I see, it was measured. 681018 11 148836 darin 2012-07-27 13:11:35 -0700 Comment on attachment 148836 updated patch on top of 89138 View in context: https://bugs.webkit.org/attachment.cgi?id=148836&action=review > Source/WebCore/platform/graphics/Color.cpp:403 > - if (unsigned alpha = (pixelColor & 0xFF000000) >> 24) { > + unsigned alpha = (pixelColor & 0xFF000000) >> 24; > + if (alpha && alpha != 255) { Some compilers might make more efficient code if we write this kind of crazy code: unsigned char alpha = pixelColor >> 24; if (alpha + 1 < 2) Might be worth testing if that’s faster. > Source/WebCore/platform/graphics/Color.cpp:420 > - if (unsigned alpha = color.alpha()) { > + unsigned alpha = color.alpha(); > + if (alpha && alpha != 255) { Similarly: unsigned char alpha = color.alpha(); if (alpha + 1 < 2) 681019 12 148836 darin 2012-07-27 13:12:17 -0700 Comment on attachment 148836 updated patch on top of 89138 If the code is used in such a tight loop, maybe these functions should be inlined, or done with vector operations on systems that support them. 681153 13 a.renevier 2012-07-27 15:26:44 -0700 (In reply to comment #11) > (From update of attachment 148836 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=148836&action=review > > > Source/WebCore/platform/graphics/Color.cpp:403 > > - if (unsigned alpha = (pixelColor & 0xFF000000) >> 24) { > > + unsigned alpha = (pixelColor & 0xFF000000) >> 24; > > + if (alpha && alpha != 255) { > > Some compilers might make more efficient code if we write this kind of crazy code: > > unsigned char alpha = pixelColor >> 24; > if (alpha + 1 < 2) > > Might be worth testing if that’s faster. Actually, it's much faster. getImageData and putImageData take now 120ms and 85ms to execute with alpha 128. So, it's nearly twice faster. It tried to set red(), green(), blue() and alpha() methods inline, but there was no performance change. I didn't try yet to use vectors. 681218 14 a.renevier 2012-07-27 16:16:48 -0700 (In reply to comment #13) > Actually, it's much faster. > getImageData and putImageData take now 120ms and 85ms to execute with alpha 128. So, it's nearly twice faster. > Sorry, I was totally mistaken. Actually, there is no performance win with that change. 685563 15 a.renevier 2012-08-02 10:42:21 -0700 Actually, I discovered that skipping the calls to premultipliedARGBFromColor/colorFromPremultipliedARGB, and performing the computation inside the loop is much faster. This optimization is already performed in webkitVideoSinkRender: http://trac.webkit.org/browser/trunk/Source/WebCore/platform/graphics/gstreamer/VideoSinkGStreamer.cpp?rev=124472#L212 This makes getImageData 10% faster, and putImageData 30% faster. Then, if I don't perform the multiply/demultiply when alpha is 255, it's still 3%/5% slower with transparency. But with the 10%/30% previous win, overall, there is no case with performance loss. 685565 16 156120 a.renevier 2012-08-02 10:43:52 -0700 Created attachment 156120 new patch proposal 685567 17 a.renevier 2012-08-02 10:45:16 -0700 With the new patch, on http://renevier.net/misc/webkit_89246.html getImageData goes from 275ms to 62ms when alpha is 255 goes from 255ms to 235ms when alpha is 128 putImageData goes from 165ms to 55ms when alpha is 255 goes from 160ms to 115ms when alpha is 128 (tested with GtkLauncher) 745065 18 156120 kenneth 2012-10-18 01:06:11 -0700 Comment on attachment 156120 new patch proposal View in context: https://bugs.webkit.org/attachment.cgi?id=156120&action=review > Source/WebCore/ChangeLog:9 > + Do not use colorFromPremultipliedARGB in getImageData nor > + premultipliedARGBFromColor in putByteArray. Avoiding object creation Qt has a lot of such optimizations, worth have a look, though some might have moved into Qt itself > Source/WebCore/platform/graphics/cairo/ImageBufferCairo.cpp:180 > + // We don't use Color::colorFromPremultipliedARGB() here because > + // one function call per pixel is just too expensive: > + // On standard 200x400 canvas for example, 80000 calls each time. // Avoid calling Color::colorFromPremultipliedARGB() per pixel for performance reasons. 749939 19 170453 a.renevier 2012-10-24 12:48:18 -0700 Created attachment 170453 Patch updated patch: better comment wording 750084 20 170453 webkit.review.bot 2012-10-24 15:01:25 -0700 Comment on attachment 170453 Patch Rejecting attachment 170453 from commit-queue. Failed to run "['/mnt/git/webkit-commit-queue/Tools/Scripts/webkit-patch', '--status-host=queues.webkit.org', '-..." exit_code: 2 Last 500 characters of output: ngeLog CONFLICT (content): Merge conflict in Source/WebCore/ChangeLog Failed to merge in the changes. Patch failed at 0001 [EFL][WK2] Get rid of Ewk_View private C API (Part 1) When you have resolved this problem run "git rebase --continue". If you would prefer to skip this patch, instead run "git rebase --skip". To restore the original branch and stop rebasing run "git rebase --abort". rebase refs/remotes/origin/master: command returned error: 1 Died at Tools/Scripts/update-webkit line 154. Full output: http://queues.webkit.org/results/14553357 751089 21 a.renevier 2012-10-25 12:02:36 -0700 (In reply to comment #20) > (From update of attachment 170453 [details]) > Rejecting attachment 170453 [details] from commit-queue. > > Failed to run "['/mnt/git/webkit-commit-queue/Tools/Scripts/webkit-patch', '--status-host=queues.webkit.org', '-..." exit_code: 2 > > Last 500 characters of output: > ngeLog > CONFLICT (content): Merge conflict in Source/WebCore/ChangeLog > Failed to merge in the changes. > Patch failed at 0001 [EFL][WK2] Get rid of Ewk_View private C API (Part 1) > > When you have resolved this problem run "git rebase --continue". > If you would prefer to skip this patch, instead run "git rebase --skip". > To restore the original branch and stop rebasing run "git rebase --abort". > > rebase refs/remotes/origin/master: command returned error: 1 > > Died at Tools/Scripts/update-webkit line 154. > > Full output: http://queues.webkit.org/results/14553357 I don't really understand why it failed here. 751148 22 170453 webkit.review.bot 2012-10-25 13:09:14 -0700 Comment on attachment 170453 Patch Clearing flags on attachment: 170453 Committed r132522: <http://trac.webkit.org/changeset/132522> 751149 23 webkit.review.bot 2012-10-25 13:09:19 -0700 All reviewed patches have been landed. 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