49005bf892
blink skips all pending commands during picture recording if it is drawing an opaque full-frame geometry or image. This may improve performance for some edge cases. To recognize an opaque full-frame drawing should be cheap enough. Otherwise, the overhead will offset the improvement. Unfortunately, data from perf for content_shell on Nexus7 shows that SkDeferredCanvas::isFullFrame is far from cheap. Table below shows that how much isFullFrame() costs in the whole render process. benchmark percentage my local benchmark(draw 1000 sprites) 4.1% speedReading 2.8% FishIETank(1000 fishes) 1.5% GUIMark3 Bitmap 2.0% By contrast, real recording (SkGPipeCanvas::drawBitmapRectToRect) and real rasterization (GrDrawTarget::drawRect) cost ~4% and ~6% in the whole render process respectively. Apparently, SkDeferredCanvas::isFullFrame() is nontrivial. getDeviceSize() is the main contributor to this hotspot. The change simply save the canvasSize and reuse it among drawings if it is not a fresh frame. This change cut off ~65% (or improved ~2 times) of isFullFrame(). telemetry smoothness canvas_tough_test didn't show obvious improvement or regression. BUG=411166 Committed: https://skia.googlesource.com/skia/+/8e45c3777d886ba3fe239bb549d06b0693692152 R=junov@chromium.org, tomhudson@google.com, reed@google.com Author: yunchao.he@intel.com Review URL: https://codereview.chromium.org/545813002 |
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| .. | ||
| animator | ||
| config | ||
| core | ||
| device/xps | ||
| effects | ||
| gpu | ||
| images | ||
| pathops | ||
| pipe | ||
| ports | ||
| record | ||
| svg | ||
| utils | ||
| views | ||
| xml | ||