Pull gpu service/client shared memory buffer code to GpuMemoryBufferSupport

gpu/ipc/common/gpu_memory_buffer_support.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 "gpu/ipc/common/gpu_memory_buffer_support.h"
+
+#include "base/logging.h"
+#include "build/build_config.h"
+
+#if defined(USE_OZONE)
+#include "ui/ozone/public/client_native_pixmap_factory.h"
+#endif
+
+namespace gpu {
+
+gfx::GpuMemoryBufferType GetNativeGpuMemoryBufferType() {
+#if defined(OS_MACOSX)
+  return gfx::IO_SURFACE_BUFFER;
+#endif
+#if defined(OS_ANDROID)

[dcheng, 2016/03/23 23:42:12]

elif? Or are these not mutually exclusive?

[Fady Samuel, 2016/03/23 23:49:54]

They are mutually exclusive. Done.

+  return gfx::SURFACE_TEXTURE_BUFFER;
+#endif
+#if defined(USE_OZONE)
+  return gfx::OZONE_NATIVE_PIXMAP;
+#endif
+  return gfx::EMPTY_BUFFER;
+}
+
+bool IsNativeGpuMemoryBufferConfigurationSupported(gfx::BufferFormat format,
+                                                   gfx::BufferUsage usage) {
+#if defined(OS_MACOSX)
+  switch (usage) {
+    case gfx::BufferUsage::GPU_READ:
+    case gfx::BufferUsage::SCANOUT:
+      return format == gfx::BufferFormat::BGRA_8888 ||
+             format == gfx::BufferFormat::RGBA_8888;
+    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
+    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
+      return format == gfx::BufferFormat::R_8 ||
+             format == gfx::BufferFormat::BGRA_8888 ||
+             format == gfx::BufferFormat::UYVY_422 ||
+             format == gfx::BufferFormat::YUV_420_BIPLANAR;
+  }
+  NOTREACHED();
+  return false;
+#endif

[dcheng, 2016/03/23 23:42:12]

Similar comment here about #elif

[Fady Samuel, 2016/03/23 23:49:54]

Done.

+
+#if defined(OS_ANDROID)
+  switch (usage) {
+    case gfx::BufferUsage::GPU_READ:
+    case gfx::BufferUsage::SCANOUT:
+    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
+      return false;
+    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
+      return format == gfx::BufferFormat::RGBA_8888;
+  }
+  NOTREACHED();
+  return false;
+#endif
+
+#if defined(USE_OZONE)
+  if (!ui::ClientNativePixmapFactory::GetInstance()) {
+    // unittests don't have to set ClientNativePixmapFactory.
+    return false;
+  }
+  return ui::ClientNativePixmapFactory::GetInstance()->IsConfigurationSupported(
+      format, usage);
+#endif
+
+  NOTREACHED();
+  return false;
+}
+
+}  // namespace gpu