Send compositor frame IPC with metadata.

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"
 #include "cc/append_quads_data.h"
+#include "cc/compositor_frame_metadata.h"
 #include "cc/damage_tracker.h"
 #include "cc/debug_rect_history.h"
 #include "cc/delay_based_time_source.h"
 #include "cc/font_atlas.h"
 #include "cc/frame_rate_counter.h"
 #include "cc/gl_renderer.h"
 #include "cc/heads_up_display_layer_impl.h"
 #include "cc/layer_iterator.h"
 #include "cc/layer_tree_host.h"
 #include "cc/layer_tree_host_common.h"
@@ skipping 670 matching lines @@
     m_client->setNeedsCommitOnImplThread();
 }
 
 void LayerTreeHostImpl::onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds)
 {
     base::TimeTicks timebase = base::TimeTicks::FromInternalValue(monotonicTimebase * base::Time::kMicrosecondsPerSecond);
     base::TimeDelta interval = base::TimeDelta::FromMicroseconds(intervalInSeconds * base::Time::kMicrosecondsPerSecond);
     m_client->onVSyncParametersChanged(timebase, interval);
 }
 
+CompositorFrameMetadata LayerTreeHostImpl::makeCompositorFrameMetadata() const
+{
+    CompositorFrameMetadata metadata;
+    metadata.rootScrollOffset = m_rootScrollLayerImpl->scrollOffset() + m_rootScrollLayerImpl->scrollDelta() + m_pinchZoomViewport.scrollDelta();
+    metadata.pageScaleFactor = m_pinchZoomViewport.totalPageScaleFactor();
+    metadata.viewportSize = m_pinchZoomViewport.bounds().size();
+    metadata.rootLayerSize = m_rootScrollLayerImpl->bounds();
+    metadata.minPageScaleFactor = m_pinchZoomViewport.minPageScaleFactor();
+    metadata.maxPageScaleFactor = m_pinchZoomViewport.maxPageScaleFactor();
+    if (!m_settings.pageScalePinchZoomEnabled) {
+        metadata.rootScrollOffset.Scale(1 / m_pinchZoomViewport.pageScaleFactor());
+        metadata.rootLayerSize.Scale(1 / m_pinchZoomViewport.pageScaleFactor());
+    }
+
+    return metadata;
+}
+
 void LayerTreeHostImpl::drawLayers(const FrameData& frame)
 {
     TRACE_EVENT0("cc", "LayerTreeHostImpl::drawLayers");
     DCHECK(canDraw());
     DCHECK(!frame.renderPasses.empty());
 
     // FIXME: use the frame begin time from the overall compositor scheduler.
     // This value is currently inaccessible because it is up in Chromium's
     // RenderWidget.
     m_fpsCounter->markBeginningOfFrame(base::TimeTicks::Now());
@@ skipping 793 matching lines @@
     ScrollbarAnimationController* scrollbarController = layer->scrollbarAnimationController();
     double monotonicTime = (time - base::TimeTicks()).InSecondsF();
     if (scrollbarController && scrollbarController->animate(monotonicTime))
         m_client->setNeedsRedrawOnImplThread();
 
     for (size_t i = 0; i < layer->children().size(); ++i)
         animateScrollbarsRecursive(layer->children()[i], time);
 }
 
 }  // namespace cc