This change adds continuous painting mode to the compositor, which makes it easier to detect how certain DOMNodes and CSSStyles affect painting performance. If active it calls setNeedsDisplay() on every Layer in every frame.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11450022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@174105 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 22 insertions, 0 deletions

diff --git a/cc/layer_tree_host.cc b/cc/layer_tree_host.cc
index 4a228f4..91276de 100644
--- a/cc/layer_tree_host.cc
+++ b/cc/layer_tree_host.cc
@@ -221,6 +221,28 @@ void LayerTreeHost::acquireLayerTextures()
     m_proxy->acquireLayerTextures();
 }
 
+void LayerTreeHost::didBeginFrame()
+{
+    m_client->didBeginFrame();
+
+    if (m_debugState.continuousPainting)
+        setNeedsDisplayOnAllLayersRecursive(m_rootLayer.get());
+}
+
+void LayerTreeHost::setNeedsDisplayOnAllLayersRecursive(Layer* layer)
+{
+    if (!layer)
+        return;
+
+    layer->setNeedsDisplay();
+
+    setNeedsDisplayOnAllLayersRecursive(layer->maskLayer());
+    setNeedsDisplayOnAllLayersRecursive(layer->replicaLayer());
+
+    for (size_t childIndex = 0; childIndex < layer->children().size(); ++childIndex)
+        setNeedsDisplayOnAllLayersRecursive(layer->children()[childIndex].get());
+}
+
 void LayerTreeHost::updateAnimations(base::TimeTicks frameBeginTime)
 {
     m_animating = true;