gpu: Move image creation part of GpuMemoryBufferFactory interface to gpu namespace.

This moves the image creation part of the GpuMemoryBufferFactory
interface to a new ImageFactory interface in the gpu namespace. This
is necessary for in-process command buffer to be able to create
images.

This also moves some utility functions from CommandBufferProxy to
this new ImageFactory interface so they can be reused by the
in-process command buffer code.

BUG=423533

Review URL: https://codereview.chromium.org/659883003

Cr-Commit-Position: refs/heads/master@{#301732}

3 files changed, 132 insertions, 0 deletions

diff --git a/gpu/command_buffer/service/BUILD.gn b/gpu/command_buffer/service/BUILD.gn
index 3b2b782..8293fbc 100644
--- a/gpu/command_buffer/service/BUILD.gn
+++ b/gpu/command_buffer/service/BUILD.gn
@@ -69,6 +69,8 @@ source_set("service") {
     "gpu_tracer.h",
     "id_manager.h",
     "id_manager.cc",
+    "image_factory.cc",
+    "image_factory.h",
     "image_manager.cc",
     "image_manager.h",
     "in_process_command_buffer.cc",
diff --git a/gpu/command_buffer/service/image_factory.cc b/gpu/command_buffer/service/image_factory.cc
new file mode 100644
index 0000000..0b740d8
--- /dev/null
+++ b/gpu/command_buffer/service/image_factory.cc
@@ -0,0 +1,76 @@
+// 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 {
+
+ImageFactory::ImageFactory() {
+}
+
+ImageFactory::~ImageFactory() {
+}
+
+// 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
diff --git a/gpu/command_buffer/service/image_factory.h b/gpu/command_buffer/service/image_factory.h
new file mode 100644
index 0000000..40dd15a0e
--- /dev/null
+++ b/gpu/command_buffer/service/image_factory.h
@@ -0,0 +1,54 @@
+// 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.
+
+#ifndef GPU_COMMAND_BUFFER_SERVICE_IMAGE_FACTORY_H_
+#define GPU_COMMAND_BUFFER_SERVICE_IMAGE_FACTORY_H_
+
+#include "base/memory/ref_counted.h"
+#include "gpu/gpu_export.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/gpu_memory_buffer.h"
+
+namespace gfx {
+class GLImage;
+}
+
+namespace gpu {
+
+class GPU_EXPORT ImageFactory {
+ public:
+  ImageFactory();
+
+  // Returns a valid GpuMemoryBuffer format given a valid internalformat as
+  // defined by CHROMIUM_gpu_memory_buffer_image.
+  static gfx::GpuMemoryBuffer::Format ImageFormatToGpuMemoryBufferFormat(
+      unsigned internalformat);
+
+  // Returns a valid GpuMemoryBuffer usage given a valid usage as defined by
+  // CHROMIUM_gpu_memory_buffer_image.
+  static gfx::GpuMemoryBuffer::Usage ImageUsageToGpuMemoryBufferUsage(
+      unsigned usage);
+
+  // Returns true if |internalformat| is compatible with |format|.
+  static bool IsImageFormatCompatibleWithGpuMemoryBufferFormat(
+      unsigned internalformat,
+      gfx::GpuMemoryBuffer::Format format);
+
+  // Creates a GLImage instance for GPU memory buffer identified by |handle|.
+  // |client_id| should be set to the client requesting the creation of instance
+  // and can be used by factory implementation to verify access rights.
+  virtual scoped_refptr<gfx::GLImage> CreateImageForGpuMemoryBuffer(
+      const gfx::GpuMemoryBufferHandle& handle,
+      const gfx::Size& size,
+      gfx::GpuMemoryBuffer::Format format,
+      unsigned internalformat,
+      int client_id) = 0;
+
+ protected:
+  virtual ~ImageFactory();
+};
+
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_IMAGE_FACTORY_H_