Partial swap implementation for surfaceless

content/browser/compositor/gpu_surfaceless_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_surfaceless_browser_compositor_output_surface.h"
 
 #include "cc/output/compositor_frame.h"
 #include "content/browser/compositor/buffer_queue.h"
 #include "content/browser/compositor/reflector_impl.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace content {
 
 GpuSurfacelessBrowserCompositorOutputSurface::
     GpuSurfacelessBrowserCompositorOutputSurface(
         const scoped_refptr<ContextProviderCommandBuffer>& context,
         int surface_id,
         IDMap<BrowserCompositorOutputSurface>* output_surface_map,
         const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
         scoped_ptr<cc::OverlayCandidateValidator> overlay_candidate_validator,
+        GLHelper* gl_helper,
         unsigned internalformat)
     : GpuBrowserCompositorOutputSurface(context,
                                         surface_id,
                                         output_surface_map,
                                         vsync_manager,
                                         overlay_candidate_validator.Pass()),
-      internalformat_(internalformat) {
+      internalformat_(internalformat),
+      gl_helper_(gl_helper) {
 }
 
 GpuSurfacelessBrowserCompositorOutputSurface::
     ~GpuSurfacelessBrowserCompositorOutputSurface() {
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
   DCHECK(output_surface_);
 
+  output_surface_->SwapBuffers(frame->gl_frame_data->sub_buffer_rect);
+  // Disable the sub-buffer processing path on the parent classes, because we
+  // have handled it here.
+  frame->gl_frame_data->sub_buffer_rect = gfx::Rect(frame->gl_frame_data->size);
+
   const gfx::Size& size = frame->gl_frame_data->size;
   context_provider_->ContextGL()->ScheduleOverlayPlaneCHROMIUM(
       0,
       GL_OVERLAY_TRANSFORM_NONE_CHROMIUM,
       output_surface_->current_texture_id(),
       0,
       0,
       size.width(),
       size.height(),
       0,
       0,
       1.0f,
       1.0f);
-  output_surface_->SwapBuffers();
   GpuBrowserCompositorOutputSurface::SwapBuffers(frame);
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::OnSwapBuffersComplete() {
   DCHECK(output_surface_);
   output_surface_->PageFlipComplete();
   GpuBrowserCompositorOutputSurface::OnSwapBuffersComplete();
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::BindFramebuffer() {
   DCHECK(output_surface_);
   output_surface_->BindFramebuffer();
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::Reshape(
     const gfx::Size& size,
     float scale_factor) {
   GpuBrowserCompositorOutputSurface::Reshape(size, scale_factor);
   DCHECK(output_surface_);
   output_surface_->Reshape(SurfaceSize(), scale_factor);
 }
 
 bool GpuSurfacelessBrowserCompositorOutputSurface::BindToClient(
     cc::OutputSurfaceClient* client) {
   if (!GpuBrowserCompositorOutputSurface::BindToClient(client))
     return false;
-  output_surface_.reset(new BufferQueue(context_provider_, internalformat_));
+  output_surface_.reset(
+      new BufferQueue(context_provider_, gl_helper_, internalformat_));
   return output_surface_->Initialize();
 }
 
 }  // namespace content