cc: Adding support for RGBA_4444 tile textures

cc/resources/raster_worker_pool.cc

Index: cc/resources/raster_worker_pool.cc
diff --git a/cc/resources/raster_worker_pool.cc b/cc/resources/raster_worker_pool.cc
index aced03fcec6c8eb3c5e413d5213f8b635e3b756a..11228895c28419b586e5658fdee6a9ef61a9f717 100644
--- a/cc/resources/raster_worker_pool.cc
+++ b/cc/resources/raster_worker_pool.cc
@@ -48,7 +48,8 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
                            int source_frame_number,
                            RenderingStatsInstrumentation* rendering_stats,
                            const RasterWorkerPool::RasterTask::Reply& reply,
-                           TaskVector* dependencies)
+                           TaskVector* dependencies,
+                           bool use_16bit_tiles)
       : internal::RasterWorkerPoolTask(resource, dependencies),
         picture_pile_(picture_pile),
         content_rect_(content_rect),
@@ -60,7 +61,8 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
         tile_id_(tile_id),
         source_frame_number_(source_frame_number),
         rendering_stats_(rendering_stats),
-        reply_(reply) {}
+        reply_(reply),
+        use_16bit_tiles_(use_16bit_tiles) {}
 
   void RunAnalysisOnThread(unsigned thread_index) {
     TRACE_EVENT1("cc",
@@ -89,7 +91,8 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
     analysis_.is_solid_color &= kUseColorEstimator;
   }
 
-  bool RunRasterOnThread(SkDevice* device, unsigned thread_index) {
+  bool RunRasterOnThread(unsigned thread_index,
+                         void* buffer, gfx::Size size) {
     TRACE_EVENT2(
         benchmark_instrumentation::kCategory,
         benchmark_instrumentation::kRunRasterOnThread,
@@ -102,7 +105,6 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
         devtools_instrumentation::kRasterTask, layer_id_);
 
     DCHECK(picture_pile_.get());
-    DCHECK(device);
 
     if (analysis_.is_solid_color)
       return false;
@@ -110,8 +112,14 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
     PicturePileImpl* picture_clone =
         picture_pile_->GetCloneForDrawingOnThread(thread_index);
 
-    SkCanvas canvas(device);
+    SkBitmap bitmap_32;
+    bitmap_32.setConfig(SkBitmap::kARGB_8888_Config,
+                        size.width(),
+                        size.height());
+    bitmap_32.allocPixels();
+    SkDevice device_32(bitmap_32);
 
+    SkCanvas canvas(&device_32);
     skia::RefPtr<SkDrawFilter> draw_filter;
     switch (raster_mode_) {
       case LOW_QUALITY_RASTER_MODE:
@@ -149,14 +157,23 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
       picture_clone->RasterToBitmap(
           &canvas, content_rect_, contents_scale_, NULL);
     }
+
+    if (use_16bit_tiles_) {
+      LOG(ERROR) << "KAANB: copying over to 16-bits";
+      SkBitmap bitmap_16;
+      bitmap_16.setPixels(buffer);
+      bitmap_32.copyTo(&bitmap_16, SkBitmap::kARGB_4444_Config);
+    }
+
     return true;
   }
 
   // Overridden from internal::RasterWorkerPoolTask:
-  virtual bool RunOnWorkerThread(SkDevice* device, unsigned thread_index)
+  virtual bool RunOnWorkerThread(unsigned thread_index,
+                                 void* buffer, gfx::Size size)
       OVERRIDE {
     RunAnalysisOnThread(thread_index);
-    return RunRasterOnThread(device, thread_index);
+    return RunRasterOnThread(thread_index, buffer, size);
   }
   virtual void CompleteOnOriginThread() OVERRIDE {
     reply_.Run(analysis_, !HasFinishedRunning() || WasCanceled());
@@ -189,6 +206,7 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
   int source_frame_number_;
   RenderingStatsInstrumentation* rendering_stats_;
   const RasterWorkerPool::RasterTask::Reply reply_;
+  bool use_16bit_tiles_;
 
   DISALLOW_COPY_AND_ASSIGN(RasterWorkerPoolTaskImpl);
 };
@@ -379,7 +397,8 @@ RasterWorkerPool::RasterTask RasterWorkerPool::CreateRasterTask(
     int source_frame_number,
     RenderingStatsInstrumentation* rendering_stats,
     const RasterTask::Reply& reply,
-    Task::Set* dependencies) {
+    Task::Set* dependencies,
+    bool use_16bit_tiles) {
   return RasterTask(
       new RasterWorkerPoolTaskImpl(resource,
                                    picture_pile,
@@ -393,7 +412,8 @@ RasterWorkerPool::RasterTask RasterWorkerPool::CreateRasterTask(
                                    source_frame_number,
                                    rendering_stats,
                                    reply,
-                                   &dependencies->tasks_));
+                                   &dependencies->tasks_,
+                                   use_16bit_tiles));
 }
 
 // static