cc: Route offscreen context creation for compositor to the browser.

ui/compositor/offscreen_context.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 "ui/compositor/offscreen_context.h"
+
+#include "third_party/skia/include/gpu/GrContext.h"
+#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
+#include "ui/compositor/compositor.h"
+
+namespace ui {
+
+OffscreenContext::OffscreenContext(
+    ContextFactory* context_factory,
+    OffscreenContextClient* client)
+    : context_factory_(context_factory),
+      client_(client) {
+}
+
+OffscreenContext::~OffscreenContext() {
+  if (context3d_)
+    context3d_->setMemoryAllocationChangedCallbackCHROMIUM(NULL);
+  if (gr_context_)
+    gr_context_->contextDestroyed();
+}
+
+WebKit::WebGraphicsContext3D* OffscreenContext::Context3d() {
+  if (context3d_)
+    return context3d_.get();
+
+  context3d_.reset(context_factory_->CreateOffscreenContext());
+  if (context3d_ &&
+      (!context3d_->makeContextCurrent() ||
+       context3d_->getGraphicsResetStatusARB()))
+    context3d_.reset();
+
+  DidCreateContext(!!context3d_);
+  if (!context3d_)
+    return NULL;
+
+  context3d_->setContextLostCallback(this);
+  return context3d_.get();
+}
+
+static void BindWebGraphicsContext3DGLContextCallback(
+    const GrGLInterface* interface) {
+  reinterpret_cast<WebKit::WebGraphicsContext3D*>(
+      interface->fCallbackData)->makeContextCurrent();
+}
+
+GrContext* OffscreenContext::GrContext() {
+  if (gr_context_)
+    return gr_context_.get();
+  if (!context3d_)
+    return NULL;
+
+  skia::RefPtr<GrGLInterface> interface = skia::AdoptRef(
+      context3d_->createGrGLInterface());
+  interface->fCallback = BindWebGraphicsContext3DGLContextCallback;
+  interface->fCallbackData =
+      reinterpret_cast<GrGLInterfaceCallbackData>(context3d_.get());
+
+  gr_context_ = skia::AdoptRef(GrContext::Create(
+      kOpenGL_Shaders_GrEngine,
+      reinterpret_cast<GrPlatform3DContext>(interface.get())));
+  if (!gr_context_)
+    return NULL;
+
+  gr_context_->setTextureCacheLimits(
+      kMaxGaneshTextureCacheCount, kMaxGaneshTextureCacheBytes);
+  return gr_context_.get();
+}
+
+void OffscreenContext::DidCreateContext(bool success) {
+  client_->DidCreateContext(this, success);
+}
+
+void OffscreenContext::onContextLost() {
+  if (context3d_) {
+    context3d_->setMemoryAllocationChangedCallbackCHROMIUM(NULL);
+  }
+  scoped_ptr<WebKit::WebGraphicsContext3D> context3d = context3d_.Pass();
+
+  skia::RefPtr<class GrContext> gr_context = gr_context_;
+  if (gr_context_) {
+    gr_context_->contextDestroyed();
+    gr_context_.clear();
+  }
+
+  client_->DidLoseContext(this);
+}
+
+}  // namespace ui