gpu: Add CHROMIUM_image support to in-process command buffer.

gpu/command_buffer/service/image_factory.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 "gpu/command_buffer/service/image_factory.h"
+
+#include "ui/gl/gl_bindings.h"
+
+namespace gpu {
+
+// static
+gfx::GpuMemoryBuffer::Format ImageFactory::ImageFormatToGpuMemoryBufferFormat(
+    unsigned internalformat) {
+  switch (internalformat) {
+    case GL_RGB:
+      return gfx::GpuMemoryBuffer::RGBX_8888;
+    case GL_RGBA:
+      return gfx::GpuMemoryBuffer::RGBA_8888;
+    default:
+      NOTREACHED();
+      return gfx::GpuMemoryBuffer::RGBA_8888;
+  }
+}
+
+// static
+gfx::GpuMemoryBuffer::Usage ImageFactory::ImageUsageToGpuMemoryBufferUsage(
+    unsigned usage) {
+  switch (usage) {
+    case GL_MAP_CHROMIUM:
+      return gfx::GpuMemoryBuffer::MAP;
+    case GL_SCANOUT_CHROMIUM:
+      return gfx::GpuMemoryBuffer::SCANOUT;
+    default:
+      NOTREACHED();
+      return gfx::GpuMemoryBuffer::MAP;
+  }
+}
+
+// static
+bool ImageFactory::IsImageFormatCompatibleWithGpuMemoryBufferFormat(
+    unsigned internalformat,
+    gfx::GpuMemoryBuffer::Format format) {
+  switch (internalformat) {
+    case GL_RGB:
+      switch (format) {
+        case gfx::GpuMemoryBuffer::RGBX_8888:
+          return true;
+        case gfx::GpuMemoryBuffer::RGBA_8888:
+        case gfx::GpuMemoryBuffer::BGRA_8888:
+          return false;
+      }
+      NOTREACHED();
+      return false;
+    case GL_RGBA:
+      switch (format) {
+        case gfx::GpuMemoryBuffer::RGBX_8888:
+          return false;
+        case gfx::GpuMemoryBuffer::RGBA_8888:
+        case gfx::GpuMemoryBuffer::BGRA_8888:
+          return true;
+      }
+      NOTREACHED();
+      return false;
+    default:
+      NOTREACHED();
+      return false;
+  }
+}
+
+}  // namespace gpu