Add GpuMemoryBuffer support for DXGI handles.

gpu/ipc/service/gpu_memory_buffer_factory_win.cc

+// Copyright 2017 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 "gpu/ipc/service/gpu_memory_buffer_factory_win.h"
+
+#include "ui/gl/gl_image_dxgi.h"
+
+namespace gpu {
+
+GpuMemoryBufferFactoryWin::GpuMemoryBufferFactoryWin() {}
+
+GpuMemoryBufferFactoryWin::~GpuMemoryBufferFactoryWin() {}
+
+gfx::GpuMemoryBufferHandle GpuMemoryBufferFactoryWin::CreateGpuMemoryBuffer(
+    gfx::GpuMemoryBufferId id,
+    const gfx::Size& size,
+    gfx::BufferFormat format,
+    gfx::BufferUsage usage,
+    int client_id,
+    SurfaceHandle surface_handle) {
+  NOTIMPLEMENTED();
+  return gfx::GpuMemoryBufferHandle();
+}
+
+void GpuMemoryBufferFactoryWin::DestroyGpuMemoryBuffer(
+    gfx::GpuMemoryBufferId id,
+    int client_id) {
+  // The buffer is deleted when all references to the handle are destroyed.
+}
+
+ImageFactory* GpuMemoryBufferFactoryWin::AsImageFactory() {
+  return this;
+}
+
+// Overridden from ImageFactory:
+scoped_refptr<gl::GLImage>
+GpuMemoryBufferFactoryWin::CreateImageForGpuMemoryBuffer(
+    const gfx::GpuMemoryBufferHandle& handle,
+    const gfx::Size& size,
+    gfx::BufferFormat format,
+    unsigned internalformat,
+    int client_id,
+    SurfaceHandle surface_handle) {
+  if (handle.type != gfx::DXGI_HANDLE)

[reveman, 2017/07/12 15:04:14]

DCHECK_EQ(handle.type, gfx::DXGI_HANDLE)?

+    return nullptr;
+  base::win::ScopedHandle raw_handle(handle.handle.GetHandle());

[reveman, 2017/07/12 15:04:14]

optional nit: s/raw_handle/scoped_handle/ or maybe just avoid the temporary
variable and base::win::ScopedHandle(handle.handle.GetHandle()) below in ctor
call

+  scoped_refptr<gl::GLImageDXGIHandle> image(new gl::GLImageDXGIHandle(

[dcheng, 2017/07/12 08:46:19]

Nit: auto image = base::MakeRefCounted<gl::GLImageDXGIHandle>(...);

+      size, std::move(raw_handle), handle.array_level));
+  if (!image->Initialize())
+    return nullptr;
+  return image;
+}
+
+scoped_refptr<gl::GLImage> GpuMemoryBufferFactoryWin::CreateAnonymousImage(
+    const gfx::Size& size,
+    gfx::BufferFormat format,
+    unsigned internalformat) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+unsigned GpuMemoryBufferFactoryWin::RequiredTextureType() {
+  return 0;
+}
+
+bool GpuMemoryBufferFactoryWin::SupportsFormatRGB() {
+  return false;
+}
+
+}  // namespace gpu