diff options
| author | vangelis@chromium.org <vangelis@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2013-11-07 08:02:03 +0000 |
|---|---|---|
| committer | vangelis@chromium.org <vangelis@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2013-11-07 08:02:03 +0000 |
| commit | 864b846301f7e59f964a988a14c0eb11ee856adb (patch) | |
| tree | e2a09b17b484b3f7bafc5e997a24409bf453110f /cc/resources | |
| parent | 5248357eff4759ec3f905b9fa271ba9496259f92 (diff) | |
| download | chromium_src-864b846301f7e59f964a988a14c0eb11ee856adb.zip chromium_src-864b846301f7e59f964a988a14c0eb11ee856adb.tar.gz chromium_src-864b846301f7e59f964a988a14c0eb11ee856adb.tar.bz2 | |
Limit pixels that get cleared to repaint area.
Since we now keep the canvas around in the ContentLayerUpdater, we often
end up getting small invalidations that paint on a large canvas. In those
cases, instead of clearing the entire canvas to transparent, clear only the
portion that will be repainted.
BUG=313494
Review URL: https://codereview.chromium.org/61403003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233539 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'cc/resources')
| -rw-r--r-- | cc/resources/content_layer_updater.cc | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/cc/resources/content_layer_updater.cc b/cc/resources/content_layer_updater.cc index 92cabf2..e3f87a4 100644 --- a/cc/resources/content_layer_updater.cc +++ b/cc/resources/content_layer_updater.cc @@ -62,12 +62,14 @@ void ContentLayerUpdater::PaintContents(SkCanvas* canvas, SkRect layer_sk_rect = SkRect::MakeXYWH( layer_rect.x(), layer_rect.y(), layer_rect.width(), layer_rect.height()); + canvas->clipRect(layer_sk_rect); + // If the layer has opaque contents then there is no need to // clear the canvas before painting. - if (!layer_is_opaque_) - canvas->clear(SK_ColorTRANSPARENT); - - canvas->clipRect(layer_sk_rect); + if (!layer_is_opaque_) { + TRACE_EVENT0("cc", "Clear"); + canvas->drawColor(SK_ColorTRANSPARENT, SkXfermode::kSrc_Mode); + } gfx::RectF opaque_layer_rect; painter_->Paint(canvas, layer_rect, &opaque_layer_rect); |