Connect Sky and Ganesh in SkyShell

sky/shell/gpu/rasterizer.cc

 // Copyright 2015 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 "sky/shell/gpu/rasterizer.h"
 
 #include "sky/shell/gpu/ganesh_context.h"
 #include "sky/shell/gpu/ganesh_surface.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_share_group.h"
 #include "ui/gl/gl_surface.h"
 
 namespace sky {
 namespace shell {
 namespace {
 
 gfx::Size GetSize(SkPicture* picture) {
   const SkRect& rect = picture->cullRect();
   return gfx::Size(rect.width(), rect.height());
 }
 
 }  // namespace
 
-Rasterizer::Rasterizer() : weak_factory_(this) {
+Rasterizer::Rasterizer()
+    : share_group_(new gfx::GLShareGroup()), weak_factory_(this) {
 }
 
 Rasterizer::~Rasterizer() {
 }
 
 base::WeakPtr<Rasterizer> Rasterizer::GetWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }
 
 void Rasterizer::OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) {
-  share_group_ = make_scoped_refptr(new gfx::GLShareGroup());
   surface_ = gfx::GLSurface::CreateViewGLSurface(widget);
   CHECK(surface_) << "GLSurface required.";
-  CHECK(CreateGLContext()) << "GLContext required.";
 }
 
 void Rasterizer::Draw(skia::RefPtr<SkPicture> picture) {
-  // TODO(abarth): We should handle losing the GL context.
+  if (!surface_)
+    return;
+
+  EnsureGLContext();
   CHECK(context_->MakeCurrent(surface_.get()));
   EnsureGaneshSurface(GetSize(picture.get()));
 
   SkCanvas* canvas = ganesh_surface_->canvas();
   canvas->drawPicture(picture.get());
   canvas->flush();
 
   surface_->SwapBuffers();
 }
 
 void Rasterizer::OnOutputSurfaceDestroyed() {
+  ganesh_surface_.reset();
+  ganesh_context_.reset();
+  context_ = nullptr;
+  surface_ = nullptr;
 }
 
-bool Rasterizer::CreateGLContext() {
+void Rasterizer::EnsureGLContext() {
+  if (context_)
+    return;
   context_ = gfx::GLContext::CreateGLContext(share_group_.get(), surface_.get(),
                                              gfx::PreferIntegratedGpu);
-  if (!context_)
-    return false;
+  CHECK(context_) << "GLContext required.";
+  CHECK(context_->MakeCurrent(surface_.get()));
   ganesh_context_.reset(new GaneshContext(context_.get()));
-  return true;
 }
 
 void Rasterizer::EnsureGaneshSurface(const gfx::Size& size) {
   if (!ganesh_surface_ || ganesh_surface_->size() != size)
     ganesh_surface_.reset(new GaneshSurface(ganesh_context_.get(), size));
 }
 
 }  // namespace shell
 }  // namespace sky