Draw the offscreen texture to reflector's surface without extra copy

content/browser/compositor/gpu_browser_compositor_output_surface.cc

 // Copyright 2014 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 "content/browser/compositor/gpu_browser_compositor_output_surface.h"
 
 #include "cc/output/compositor_frame.h"
 #include "cc/output/output_surface_client.h"
 #include "content/browser/compositor/browser_compositor_overlay_candidate_validator.h"
 #include "content/browser/compositor/reflector_impl.h"
+#include "content/browser/compositor/reflector_texture.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
-#include "content/public/browser/browser_thread.h"
 #include "gpu/command_buffer/client/context_support.h"
-#include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace content {
 
 GpuBrowserCompositorOutputSurface::GpuBrowserCompositorOutputSurface(
     const scoped_refptr<ContextProviderCommandBuffer>& context,
     const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
     scoped_ptr<BrowserCompositorOverlayCandidateValidator>
         overlay_candidate_validator)
     : BrowserCompositorOutputSurface(context,
                                      vsync_manager,
@@ skipping 27 matching lines @@
   if (!BrowserCompositorOutputSurface::BindToClient(client))
     return false;
 
   GetCommandBufferProxy()->SetSwapBuffersCompletionCallback(
       swap_buffers_completion_callback_.callback());
   GetCommandBufferProxy()->SetUpdateVSyncParametersCallback(
       update_vsync_parameters_callback_.callback());
   return true;
 }
 
+void GpuBrowserCompositorOutputSurface::OnReflectorChanged() {
+  if (!reflector_) {
+    reflector_texture_.reset();
+  } else {
+    reflector_texture_.reset(new ReflectorTexture(context_provider()));
+    reflector_->OnSourceTextureMailboxUpdated(reflector_texture_->mailbox());
+  }
+}
+
 void GpuBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
   DCHECK(frame->gl_frame_data);
 
   GetCommandBufferProxy()->SetLatencyInfo(frame->metadata.latency_info);
 
   if (reflector_) {
     if (frame->gl_frame_data->sub_buffer_rect ==
-        gfx::Rect(frame->gl_frame_data->size))
+        gfx::Rect(frame->gl_frame_data->size)) {
+      reflector_texture_->CopyTextureFullImage(SurfaceSize());
       reflector_->OnSourceSwapBuffers();
-    else
-      reflector_->OnSourcePostSubBuffer(frame->gl_frame_data->sub_buffer_rect);
+    } else {
+      const gfx::Rect& rect = frame->gl_frame_data->sub_buffer_rect;
+      reflector_texture_->CopyTextureSubImage(rect);
+      reflector_->OnSourcePostSubBuffer(rect);
+    }
   }
 
   if (frame->gl_frame_data->sub_buffer_rect ==
       gfx::Rect(frame->gl_frame_data->size)) {
     context_provider_->ContextSupport()->Swap();
   } else {
     context_provider_->ContextSupport()->PartialSwapBuffers(
         frame->gl_frame_data->sub_buffer_rect);
   }
 
@@ skipping 49 matching lines @@
   }
 }
 
 bool GpuBrowserCompositorOutputSurface::
     SurfaceShouldNotShowFramesAfterSuspendForRecycle() const {
   return should_show_frames_state_ != SHOULD_SHOW_FRAMES;
 }
 #endif
 
 }  // namespace content