Mark layers that can use LCD text based on layer transform and opacity.

cc/tiled_layer_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "cc/tiled_layer.h"
 
 #include "cc/bitmap_content_layer_updater.h"
 #include "cc/layer_painter.h"
@@ skipping 1409 matching lines @@
 
     // With a huge memory limit, all layers should update and push their textures.
     root->invalidateContentRect(rootRect);
     child->invalidateContentRect(childRect);
     child2->invalidateContentRect(child2Rect);
     layerTreeHost->updateLayers(
         *m_queue.get(), std::numeric_limits<size_t>::max());
     {
         updateTextures();
         EXPECT_EQ(6, root->fakeLayerUpdater()->updateCount());
-        EXPECT_EQ(3, child->fakeLayerUpdater()->updateCount());
-        EXPECT_EQ(3, child2->fakeLayerUpdater()->updateCount());
+        EXPECT_EQ(4, child->fakeLayerUpdater()->updateCount());

[danakj, 2012/11/07 18:15:00]

Why did this happen?

[alokp, 2012/11/08 22:34:07]

Because now we call setCanUseLCDText during updateLayers, which in turn might
reset tile textures and hence change the update count. I also noticed that there
were more unit-test failures on Android because many tests assume
NoBorderTexels. In the new patch, I workaround this problem by overriding
setCanUseLCDText for FakeTiledLayer.

+        EXPECT_EQ(4, child2->fakeLayerUpdater()->updateCount());
         EXPECT_FALSE(m_queue->hasMoreUpdates());
 
         root->fakeLayerUpdater()->clearUpdateCount();
         child->fakeLayerUpdater()->clearUpdateCount();
         child2->fakeLayerUpdater()->clearUpdateCount();
 
         ScopedFakeTiledLayerImpl rootImpl(root->id());
         ScopedFakeTiledLayerImpl childImpl(child->id());
         ScopedFakeTiledLayerImpl child2Impl(child2->id());
         layerPushPropertiesTo(root.get(), rootImpl.get());
@@ skipping 179 matching lines @@
     updateTextures();
 
     // Invalidate the entire layer in layer space. When painting, the rect given to webkit should match the layer's bounds.
     layer->setNeedsDisplayRect(layerRect);
     layer->update(*m_queue.get(), 0, m_stats);
 
     EXPECT_RECT_EQ(layerRect, layer->trackingLayerPainter()->paintedRect());
 }
 
 }  // anonymous namespace