cc: Fix resource eviction with impl-side painting.

cc/layer_tree_host_impl.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 "cc/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 118 matching lines @@
 }
 
 LayerTreeHostImpl::LayerTreeHostImpl(const LayerTreeSettings& settings, LayerTreeHostImplClient* client, Proxy* proxy)
     : m_client(client)
     , m_proxy(proxy)
     , m_scrollDeltaIsInViewportSpace(false)
     , m_settings(settings)
     , m_debugState(settings.initialDebugState)
     , m_deviceScaleFactor(1)
     , m_visible(true)
-    , m_contentsTexturesPurged(false)
     , m_managedMemoryPolicy(PrioritizedResourceManager::defaultMemoryAllocationLimit(),
                             ManagedMemoryPolicy::CUTOFF_ALLOW_EVERYTHING,
                             0,
                             ManagedMemoryPolicy::CUTOFF_ALLOW_NOTHING)
     , m_needsUpdateDrawProperties(false)
     , m_pinchGestureActive(false)
     , m_fpsCounter(FrameRateCounter::create(m_proxy->hasImplThread()))
     , m_paintTimeCounter(PaintTimeCounter::create())
     , m_debugRectHistory(DebugRectHistory::create())
     , m_numImplThreadScrolls(0)
@@ skipping 62 matching lines @@
         return false;
     }
     if (deviceViewportSize().IsEmpty()) {
         TRACE_EVENT_INSTANT0("cc", "LayerTreeHostImpl::canDraw empty viewport");
         return false;
     }
     if (!m_renderer) {
         TRACE_EVENT_INSTANT0("cc", "LayerTreeHostImpl::canDraw no renderer");
         return false;
     }
-    if (m_contentsTexturesPurged) {
+    if (m_activeTree->ContentsTexturesPurged()) {
         TRACE_EVENT_INSTANT0("cc", "LayerTreeHostImpl::canDraw contents textures purged");
         return false;
     }
     return true;
 }
 
 OutputSurface* LayerTreeHostImpl::outputSurface() const
 {
     return m_outputSurface.get();
 }
@@ skipping 458 matching lines @@
     return true;
 }
 
 void LayerTreeHostImpl::enforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy)
 {
     bool evictedResources = m_client->reduceContentsTextureMemoryOnImplThread(
         m_visible ? policy.bytesLimitWhenVisible : policy.bytesLimitWhenNotVisible,
         ManagedMemoryPolicy::priorityCutoffToValue(
             m_visible ? policy.priorityCutoffWhenVisible : policy.priorityCutoffWhenNotVisible));
     if (evictedResources) {
-        setContentsTexturesPurged();
+        DCHECK(!m_pendingTree);
+        m_activeTree->SetContentsTexturesPurged();
         m_client->setNeedsCommitOnImplThread();
         m_client->onCanDrawStateChanged(canDraw());
     }
     m_client->sendManagedMemoryStats();
 
     if (m_tileManager) {
       GlobalStateThatImpactsTilePriority new_state(m_tileManager->GlobalState());
       new_state.memory_limit_in_bytes = m_visible ? policy.bytesLimitWhenVisible : policy.bytesLimitWhenNotVisible;
       new_state.memory_limit_policy = ManagedMemoryPolicy::priorityCutoffToTileMemoryLimitPolicy(
           m_visible ? policy.priorityCutoffWhenVisible : policy.priorityCutoffWhenNotVisible);
@@ skipping 309 matching lines @@
     m_outputSurface = outputSurface.Pass();
 
     if (!m_visible)
         m_renderer->setVisible(m_visible);
 
     m_client->onCanDrawStateChanged(canDraw());
 
     return true;
 }
 
-void LayerTreeHostImpl::setContentsTexturesPurged()
-{
-    m_contentsTexturesPurged = true;
-    m_client->onCanDrawStateChanged(canDraw());
-}
-
-void LayerTreeHostImpl::resetContentsTexturesPurged()
-{
-    m_contentsTexturesPurged = false;
-    m_client->onCanDrawStateChanged(canDraw());
-}
-
 void LayerTreeHostImpl::setViewportSize(const gfx::Size& layoutViewportSize, const gfx::Size& deviceViewportSize)
 {
     if (layoutViewportSize == m_layoutViewportSize && deviceViewportSize == m_deviceViewportSize)
         return;
 
     m_layoutViewportSize = layoutViewportSize;
     m_deviceViewportSize = deviceViewportSize;
 
     m_pinchZoomViewport.set_layout_viewport_size(layoutViewportSize);
 
@@ skipping 625 matching lines @@
     LayerImpl* layer = getNonCompositedContentLayerRecursive(tree->RootLayer());
     return layer ? layer->getPicture() : skia::RefPtr<SkPicture>();
 }
 
 void LayerTreeHostImpl::savePaintTime(const base::TimeDelta& totalPaintTime)
 {
     m_paintTimeCounter->SavePaintTime(totalPaintTime);
 }
 
 }  // namespace cc