content: Out-of-process GPU service support for SurfaceTexture backed GpuMemoryBuffers.

content/common/gpu/gpu_memory_buffer_factory_surface_texture.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/common/gpu/gpu_memory_buffer_factory_surface_texture.h"
+
+#include "content/common/android/surface_texture_manager.h"
+#include "ui/gl/android/surface_texture.h"
+#include "ui/gl/gl_image_surface_texture.h"
+
+namespace content {
+
+GpuMemoryBufferFactorySurfaceTexture::GpuMemoryBufferFactorySurfaceTexture() {
+}
+
+GpuMemoryBufferFactorySurfaceTexture::~GpuMemoryBufferFactorySurfaceTexture() {
+}
+
+gfx::GpuMemoryBufferHandle
+GpuMemoryBufferFactorySurfaceTexture::CreateGpuMemoryBuffer(
+    const gfx::GpuMemoryBufferId& id,
+    const gfx::Size& size,
+    unsigned internalformat) {
+  // Note: this needs to be 0 as the surface texture implemenation will take
+  // ownership of the texture and call glDeleteTextures when the GPU service
+  // attaches the surface texture to a real texture id. glDeleteTextures
+  // silently ignores 0.
+  const int kDummyTextureId = 0;
+  scoped_refptr<gfx::SurfaceTexture> surface_texture =
+      gfx::SurfaceTexture::Create(kDummyTextureId);
+  if (!surface_texture)
+    return gfx::GpuMemoryBufferHandle();
+
+  SurfaceTextureManager::GetInstance()->RegisterSurfaceTexture(
+      id.primary_id, id.secondary_id, surface_texture.get());
+
+  SurfaceTextureMapKey key(id.primary_id, id.secondary_id);
+  DCHECK(surface_textures_.find(key) == surface_textures_.end());

[no sievers, 2014/10/06 22:28:27]

nit: maybe LOG(ERROR) since a misbehaving client could actually trigger this?
And maybe fail and return?

[reveman, 2014/10/07 01:00:21]

Only the browser process can use IPC that will cause this interface to be used.
The browser is misbehaving if this DCHECK is triggered.

[no sievers, 2014/10/07 22:12:44]

Ok, if it's a request from the renderer, the browser will have generated
primary_id in GpuMemoryBufferImplSurfaceTexture::AllocateForChildProcess().

+  surface_textures_[key] = surface_texture;
+
+  gfx::GpuMemoryBufferHandle handle;
+  handle.type = gfx::SURFACE_TEXTURE_BUFFER;
+  handle.global_id = id;
+  return handle;
+}
+
+void GpuMemoryBufferFactorySurfaceTexture::DestroyGpuMemoryBuffer(
+    const gfx::GpuMemoryBufferId& id) {
+  SurfaceTextureMapKey key(id.primary_id, id.secondary_id);
+  SurfaceTextureMap::iterator it = surface_textures_.find(key);
+  if (it != surface_textures_.end())
+    surface_textures_.erase(it);
+
+  SurfaceTextureManager::GetInstance()->UnregisterSurfaceTexture(
+      id.primary_id, id.secondary_id);
+}
+
+scoped_refptr<gfx::GLImage>
+GpuMemoryBufferFactorySurfaceTexture::CreateImageForGpuMemoryBuffer(
+    const gfx::GpuMemoryBufferId& id,
+    const gfx::Size& size,
+    unsigned internalformat) {
+  SurfaceTextureMapKey key(id.primary_id, id.secondary_id);
+  SurfaceTextureMap::iterator it = surface_textures_.find(key);
+  if (it == surface_textures_.end())
+    return scoped_refptr<gfx::GLImage>();
+
+  scoped_refptr<gfx::GLImageSurfaceTexture> image(
+      new gfx::GLImageSurfaceTexture(size));
+  if (!image->Initialize(it->second.get()))
+    return scoped_refptr<gfx::GLImage>();
+
+  return image;
+}
+
+}  // namespace content