mus: Get the gpu memory buffer from the window server.

services/ui/ws/gpu_service_proxy.cc

 // Copyright 2016 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 "services/ui/ws/gpu_service_proxy.h"
 
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
+#include "gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h"
+#include "mojo/public/cpp/system/buffer.h"
+#include "mojo/public/cpp/system/platform_handle.h"
 #include "services/service_manager/public/cpp/connection.h"
 #include "services/ui/ws/gpu_service_proxy_delegate.h"
 #include "services/ui/ws/mus_gpu_memory_buffer_manager.h"
+#include "ui/gfx/buffer_format_util.h"
 
 namespace ui {
 namespace ws {
 
 namespace {
 
 const int32_t kInternalGpuChannelClientId = 1;
 const uint64_t kInternalGpuChannelClientTracingId = 1;
 
 }  // namespace
@@ skipping 66 matching lines @@
       client_id, client_tracing_id, is_gpu_host,
       base::Bind(&GpuServiceProxy::OnGpuChannelEstablished,
                  base::Unretained(this), callback, client_id));
 }
 
 void GpuServiceProxy::CreateGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
-    uint64_t surface_id,
     const mojom::GpuService::CreateGpuMemoryBufferCallback& callback) {
-  NOTIMPLEMENTED();
+  // TODO(sad): Check to see if native gpu memory buffer can be used first.
+  if (!gpu::GpuMemoryBufferImplSharedMemory::IsUsageSupported(usage) ||
+      !gpu::GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(size,
+                                                                  format)) {
+    callback.Run(gfx::GpuMemoryBufferHandle());
+    return;
+  }
+
+  size_t bytes = 0;
+  if (!gfx::BufferSizeForBufferFormatChecked(size, format, &bytes)) {
+    callback.Run(gfx::GpuMemoryBufferHandle());
+    return;
+  }
+
+  mojo::ScopedSharedBufferHandle mojo_handle =
+      mojo::SharedBufferHandle::Create(bytes);
+  if (!mojo_handle.is_valid()) {
+    callback.Run(gfx::GpuMemoryBufferHandle());
+    return;
+  }
+
+  base::SharedMemoryHandle shm_handle;
+  size_t shm_size;
+  bool readonly;
+  MojoResult result = mojo::UnwrapSharedMemoryHandle(
+      std::move(mojo_handle), &shm_handle, &shm_size, &readonly);
+  if (result != MOJO_RESULT_OK) {
+    callback.Run(gfx::GpuMemoryBufferHandle());
+    return;
+  }
+  DCHECK_EQ(shm_size, bytes);
+  DCHECK(!readonly);
+  const int stride = base::checked_cast<int>(
+      gfx::RowSizeForBufferFormat(size.width(), format, 0));
+
+  gfx::GpuMemoryBufferHandle gmb_handle;
+  gmb_handle.type = gfx::SHARED_MEMORY_BUFFER;
+  gmb_handle.id = id;
+  gmb_handle.handle = shm_handle;
+  gmb_handle.offset = 0;
+  gmb_handle.stride = stride;
+  callback.Run(gmb_handle);
 }
 
 void GpuServiceProxy::DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                              const gpu::SyncToken& sync_token) {

[reveman, 2016/11/08 19:46:45]

fyi: this sync_token is only needed for macos and I'm hoping we can remove it
soon

-  NOTIMPLEMENTED();
+  //  NOTIMPLEMENTED();
 }
 
 bool GpuServiceProxy::IsMainThread() {
   return main_thread_task_runner_->BelongsToCurrentThread();
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 GpuServiceProxy::GetIOThreadTaskRunner() {
   return io_thread_->task_runner();
 }
 
 std::unique_ptr<base::SharedMemory> GpuServiceProxy::AllocateSharedMemory(
     size_t size) {
   std::unique_ptr<base::SharedMemory> shm(new base::SharedMemory());
   if (!shm->CreateAnonymous(size))
     shm.reset();
   return shm;
 }
 
 }  // namespace ws
 }  // namespace ui