aura: Allow in process ContextProvider to hold onscreen contexts.

webkit/common/gpu/context_provider_in_process.cc

 // Copyright (c) 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 "webkit/common/gpu/context_provider_in_process.h"
 
+#include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "webkit/common/gpu/grcontext_for_webgraphicscontext3d.h"
 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 namespace webkit {
 namespace gpu {
 
 class ContextProviderInProcess::LostContextCallbackProxy
     : public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback {
  public:
@@ skipping 29 matching lines @@
 
   virtual void onMemoryAllocationChanged(
       WebKit::WebGraphicsMemoryAllocation alloc) {
     provider_->OnMemoryAllocationChanged(!!alloc.gpuResourceSizeInBytes);
   }
 
  private:
   ContextProviderInProcess* provider_;
 };
 
+// static
+scoped_refptr<ContextProviderInProcess> ContextProviderInProcess::Create(
+    const CreateCallback& create_callback) {
+  scoped_refptr<ContextProviderInProcess> provider =
+      new ContextProviderInProcess;
+  if (!provider->InitializeOnMainThread(create_callback))
+    return NULL;
+  return provider;
+}
+
+static scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl>
+CreateOffscreenContext() {
+  WebKit::WebGraphicsContext3D::Attributes attributes;
+  attributes.depth = false;
+  attributes.stencil = true;
+  attributes.antialias = false;
+  attributes.shareResources = true;
+  attributes.noAutomaticFlushes = true;
+
+  return WebGraphicsContext3DInProcessCommandBufferImpl::CreateOffscreenContext(
+      attributes).Pass();
+}
+
+// static
+scoped_refptr<ContextProviderInProcess>
+ContextProviderInProcess::CreateOffscreen() {
+  return Create(base::Bind(&CreateOffscreenContext));
+}
+
 ContextProviderInProcess::ContextProviderInProcess()
     : destroyed_(false) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   context_thread_checker_.DetachFromThread();
 }
 
 ContextProviderInProcess::~ContextProviderInProcess() {
   DCHECK(main_thread_checker_.CalledOnValidThread() ||
          context_thread_checker_.CalledOnValidThread());
 }
 
-bool ContextProviderInProcess::InitializeOnMainThread() {
+bool ContextProviderInProcess::InitializeOnMainThread(
+    const CreateCallback& create_callback) {
   DCHECK(!context3d_);
   DCHECK(main_thread_checker_.CalledOnValidThread());
+  DCHECK(!create_callback.is_null());
 
-  WebKit::WebGraphicsContext3D::Attributes attributes;
-  attributes.depth = false;
-  attributes.stencil = true;
-  attributes.antialias = false;
-  attributes.shareResources = true;
-  attributes.noAutomaticFlushes = true;
-
-  using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
-  context3d_ =
-      WebGraphicsContext3DInProcessCommandBufferImpl::CreateOffscreenContext(
-          attributes);
-
+  context3d_ = create_callback.Run();
   return context3d_;
 }
 
 bool ContextProviderInProcess::BindToCurrentThread() {
   DCHECK(context3d_);
 
   // This is called on the thread the context will be used.
   DCHECK(context_thread_checker_.CalledOnValidThread());
 
   if (lost_context_callback_proxy_)
@@ skipping 66 matching lines @@
 
 void ContextProviderInProcess::OnMemoryAllocationChanged(
     bool nonzero_allocation) {
   DCHECK(context_thread_checker_.CalledOnValidThread());
   if (gr_context_)
     gr_context_->SetMemoryLimit(nonzero_allocation);
 }
 
 }  // namespace gpu
 }  // namespace webkit