cc: Partial tile update for one-copy raster.

cc/raster/zero_copy_tile_task_worker_pool.cc

 // Copyright 2013 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/raster/zero_copy_tile_task_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/debug/traced_value.h"
 #include "cc/raster/raster_buffer.h"
 #include "cc/resources/resource.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace cc {
 namespace {
 
 class RasterBufferImpl : public RasterBuffer {
  public:
   RasterBufferImpl(ResourceProvider* resource_provider,
                    const Resource* resource)
       : lock_(resource_provider, resource->id()), resource_(resource) {}
 
   // Overridden from RasterBuffer:
   void Playback(const RasterSource* raster_source,
                 const gfx::Rect& rect,
                 float scale) override {
-    gfx::GpuMemoryBuffer* gpu_memory_buffer = lock_.GetGpuMemoryBuffer();
-    if (!gpu_memory_buffer)
-      return;
-
+    if (!lock_.gpu_memory_buffer()) {
+      bool persistent = false;  // No partial tile support here.
+      if (!lock_.AllocateGpuMemoryBuffer(persistent))
+        return;
+    }
+    gfx::GpuMemoryBuffer* gpu_memory_buffer = lock_.gpu_memory_buffer();
     void* data = NULL;
     bool rv = gpu_memory_buffer->Map(&data);
     DCHECK(rv);
     int stride;
     gpu_memory_buffer->GetStride(&stride);
     TileTaskWorkerPool::PlaybackToMemory(data, resource_->format(),
                                          resource_->size(), stride,
-                                         raster_source, rect, scale);
+                                         raster_source, rect, rect, scale);
     gpu_memory_buffer->Unmap();
   }
 
  private:
   ResourceProvider::ScopedWriteLockGpuMemoryBuffer lock_;
   const Resource* resource_;
 
   DISALLOW_COPY_AND_ASSIGN(RasterBufferImpl);
 };
 
@@ skipping 117 matching lines @@
     task->RunReplyOnOriginThread();
   }
   completed_tasks_.clear();
 }
 
 ResourceFormat ZeroCopyTileTaskWorkerPool::GetResourceFormat() {
   return resource_provider_->best_texture_format();
 }
 
 scoped_ptr<RasterBuffer> ZeroCopyTileTaskWorkerPool::AcquireBufferForRaster(
-    const Resource* resource) {
+    const TileTaskData& data) {
   return make_scoped_ptr<RasterBuffer>(
-      new RasterBufferImpl(resource_provider_, resource));
+      new RasterBufferImpl(resource_provider_, data.resource));
 }
 
 void ZeroCopyTileTaskWorkerPool::ReleaseBufferForRaster(
     scoped_ptr<RasterBuffer> buffer) {
   // Nothing to do here. RasterBufferImpl destructor cleans up after itself.
 }
 
 void ZeroCopyTileTaskWorkerPool::OnTaskSetFinished(TaskSet task_set) {
   TRACE_EVENT1("cc", "ZeroCopyTileTaskWorkerPool::OnTaskSetFinished",
                "task_set", task_set);
@@ skipping 15 matching lines @@
       new base::trace_event::TracedValue();
 
   state->BeginArray("tasks_pending");
   for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set)
     state->AppendBoolean(tasks_pending_[task_set]);
   state->EndArray();
   return state;
 }
 
 }  // namespace cc