Support stream textures with the synchronous compositor

content/browser/android/in_process/synchronous_compositor_impl.cc

 // Copyright 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 "content/browser/android/in_process/synchronous_compositor_impl.h"
 
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/lock.h"
 #include "cc/input/input_handler.h"
 #include "cc/input/layer_scroll_offset_delegate.h"
 #include "content/browser/android/in_process/synchronous_input_event_filter.h"
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 #include "content/public/browser/android/synchronous_compositor_client.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/renderer/android/synchronous_compositor_factory.h"
+#include "content/renderer/media/android/stream_texture_factory_android_synchronous_impl.h"
+#include "gpu/command_buffer/client/gl_in_process_context.h"
+#include "gpu/command_buffer/service/stream_texture_manager_in_process_android.h"
+#include "ui/gl/android/surface_texture_bridge.h"
 #include "ui/gl/gl_surface.h"
 #include "webkit/common/gpu/context_provider_in_process.h"
+#include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 namespace content {
 
 namespace {
 
+using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
+
 int GetInProcessRendererId() {
   content::RenderProcessHost::iterator it =
       content::RenderProcessHost::AllHostsIterator();
   if (it.IsAtEnd()) {
     // There should always be one RPH in single process mode.
     NOTREACHED();
     return 0;
   }
 
   int id = it.GetCurrentValue()->GetID();
   it.Advance();
   DCHECK(it.IsAtEnd());  // Not multiprocess compatible.
   return id;
 }
 
+class VideoContextProvider
+    : public StreamTextureFactorySynchronousImpl::ContextProvider {
+ public:
+  VideoContextProvider(
+      const scoped_refptr<cc::ContextProvider>& context_provider,
+      gpu::GLInProcessContext* gl_in_process_context)
+      : context_provider_(context_provider),
+        gl_in_process_context_(gl_in_process_context) {}
+
+  virtual scoped_refptr<gfx::SurfaceTextureBridge> GetSurfaceTexture(
+      uint32 stream_id) OVERRIDE {
+    return gl_in_process_context_->GetSurfaceTexture(stream_id);
+  }
+
+  virtual WebKit::WebGraphicsContext3D* Context3d() OVERRIDE {
+    return context_provider_->Context3d();
+  }
+
+ private:
+  scoped_refptr<cc::ContextProvider> context_provider_;
+  gpu::GLInProcessContext* gl_in_process_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoContextProvider);
+};
+
 class SynchronousCompositorFactoryImpl : public SynchronousCompositorFactory {
  public:
-  SynchronousCompositorFactoryImpl() {
+  SynchronousCompositorFactoryImpl()
+      : offscreen_context_as_gl_in_process_context_(NULL) {
     SynchronousCompositorFactory::SetInstance(this);
   }
 
   // SynchronousCompositorFactory
   virtual scoped_refptr<base::MessageLoopProxy>
       GetCompositorMessageLoop() OVERRIDE {
     return BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI);
   }
 
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(
       int routing_id) OVERRIDE {
     scoped_ptr<SynchronousCompositorOutputSurface> output_surface(
         new SynchronousCompositorOutputSurface(routing_id));
     return output_surface.PassAs<cc::OutputSurface>();
   }
 
   virtual InputHandlerManagerClient* GetInputHandlerManagerClient() OVERRIDE {
     return synchronous_input_event_filter();
   }
 
   SynchronousInputEventFilter* synchronous_input_event_filter() {
     return &synchronous_input_event_filter_;
   }
 
+  scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl>
+  CreateOffscreenContext() {
+    if (!gfx::GLSurface::InitializeOneOff())
+      return scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl>();
+
+    const char* allowed_extensions = "*";

[boliu, 2013/08/20 21:33:49]

Leave a comment about deduping this code.

[no sievers, 2013/08/20 21:59:58]

Well, ideally we wouldn't have one thing (GLInProcessContext) wrapped in another
thing (WGC3D) wrapped in another thing (ContextProvider).
Ideally, we'd just not be using WGC3D in content/ anymore.

+    const gfx::GpuPreference gpu_preference = gfx::PreferDiscreteGpu;
+
+    WebKit::WebGraphicsContext3D::Attributes attributes;
+    attributes.antialias = false;
+    attributes.shareResources = true;
+    attributes.noAutomaticFlushes = true;
+
+    gpu::GLInProcessContextAttribs in_process_attribs;
+    WebGraphicsContext3DInProcessCommandBufferImpl::ConvertAttributes(
+        attributes, &in_process_attribs);
+    scoped_ptr<gpu::GLInProcessContext> context(
+        gpu::GLInProcessContext::CreateContext(true,
+                                               NULL,
+                                               gfx::Size(1, 1),
+                                               attributes.shareResources,
+                                               allowed_extensions,
+                                               in_process_attribs,
+                                               gpu_preference));
+
+    offscreen_context_as_gl_in_process_context_ = context.get();
+    if (!context.get())
+      return scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl>();
+
+    return scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl>(
+        WebGraphicsContext3DInProcessCommandBufferImpl::WrapContext(
+            context.Pass(), attributes));
+  }
+
   virtual scoped_refptr<cc::ContextProvider>
   GetOffscreenContextProviderForMainThread() OVERRIDE {
     if (!offscreen_context_for_main_thread_.get() ||
         offscreen_context_for_main_thread_->DestroyedOnMainThread()) {
       offscreen_context_for_main_thread_ =
-          webkit::gpu::ContextProviderInProcess::CreateOffscreen();
+          webkit::gpu::ContextProviderInProcess::Create(base::Bind(
+              &SynchronousCompositorFactoryImpl::CreateOffscreenContext,
+              base::Unretained(this)));
       if (offscreen_context_for_main_thread_.get() &&
-          !offscreen_context_for_main_thread_->BindToCurrentThread())
+          !offscreen_context_for_main_thread_->BindToCurrentThread()) {
         offscreen_context_for_main_thread_ = NULL;
+        offscreen_context_as_gl_in_process_context_ = NULL;
+      }
     }
     return offscreen_context_for_main_thread_;
   }
 
   // This is called on both renderer main thread (offscreen context creation
   // path shared between cross-process and in-process platforms) and renderer
   // compositor impl thread (InitializeHwDraw) in order to support Android
   // WebView synchronously enable and disable hardware mode multiple times in
   // the same task. This is ok because in-process WGC3D creation may happen on
   // any thread and is lightweight.
   virtual scoped_refptr<cc::ContextProvider>
       GetOffscreenContextProviderForCompositorThread() OVERRIDE {
     base::AutoLock lock(offscreen_context_for_compositor_thread_creation_lock_);
     if (!offscreen_context_for_compositor_thread_.get() ||
         offscreen_context_for_compositor_thread_->DestroyedOnMainThread()) {
       offscreen_context_for_compositor_thread_ =
           webkit::gpu::ContextProviderInProcess::CreateOffscreen();
     }
     return offscreen_context_for_compositor_thread_;
   }
 
+  virtual scoped_ptr<StreamTextureFactory> CreateStreamTextureFactory(
+      int view_id) OVERRIDE {
+    scoped_refptr<VideoContextProvider> context_provider =
+        new VideoContextProvider(offscreen_context_for_main_thread_,
+                                 offscreen_context_as_gl_in_process_context_);
+    return make_scoped_ptr(new StreamTextureFactorySynchronousImpl(
+                               context_provider.get(), view_id))
+        .PassAs<StreamTextureFactory>();
+  }
+
  private:
   SynchronousInputEventFilter synchronous_input_event_filter_;
 
   // Only guards construction of |offscreen_context_for_compositor_thread_|,
   // not usage.
   base::Lock offscreen_context_for_compositor_thread_creation_lock_;
   scoped_refptr<cc::ContextProvider> offscreen_context_for_main_thread_;
+  gpu::GLInProcessContext* offscreen_context_as_gl_in_process_context_;

[boliu, 2013/08/20 21:33:49]

Indicate with var name or a comment that this is a pointer into
|offscreen_context_for_main_thread_| and that's why it's safe.

[no sievers, 2013/08/20 21:59:58]

Done.

   scoped_refptr<cc::ContextProvider> offscreen_context_for_compositor_thread_;
 };
 
 base::LazyInstance<SynchronousCompositorFactoryImpl>::Leaky g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(SynchronousCompositorImpl);
 
@@ skipping 172 matching lines @@
     g_factory.Get();  // Ensure it's initialized.
     SynchronousCompositorImpl::CreateForWebContents(contents);
   }
   if (SynchronousCompositorImpl* instance =
       SynchronousCompositorImpl::FromWebContents(contents)) {
     instance->SetClient(client);
   }
 }
 
 }  // namespace content