gpu: Add IOSurface backed GpuMemoryBuffer implementation.

ui/gl/gl_image_io_surface.cc

+// Copyright (c) 2013 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 "ui/gl/gl_image_io_surface.h"
+
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/io_surface_support_mac.h"
+
+namespace gfx {
+
+GLImageIOSurface::GLImageIOSurface(gfx::Size size)
+    : io_surface_support_(IOSurfaceSupport::Initialize()),
+      size_(size) {
+  CHECK(io_surface_support_);
+}
+
+GLImageIOSurface::~GLImageIOSurface() {
+  Destroy();
+}
+
+bool GLImageIOSurface::Initialize(gfx::GpuMemoryBufferHandle buffer) {
+  io_surface_.reset(io_surface_support_->IOSurfaceLookup(buffer.io_surface_id));
+  if (!io_surface_) {
+    LOG(ERROR) << "IOSurface lookup failed";
+    return false;
+  }
+
+  return true;
+}
+
+void GLImageIOSurface::Destroy() {
+}
+
+gfx::Size GLImageIOSurface::GetSize() {
+  return size_;
+}
+
+bool GLImageIOSurface::BindTexImage(unsigned target) {
+  if (target != GL_TEXTURE_RECTANGLE_ARB) {
+    // This might be supported in the future. For now, perform strict
+    // validation so we know what's going on.
+    LOG(ERROR) << "IOSurface requires TEXTURE_RECTANGLE_ARB target";
+    return false;
+  }
+
+  CGLContextObj cgl_context = static_cast<CGLContextObj>(
+      GLContext::GetCurrent()->GetHandle());
+
+  DCHECK(io_surface_);
+  CGLError cgl_error = io_surface_support_->CGLTexImageIOSurface2D(
+      cgl_context,
+      target,
+      GL_RGBA,
+      size_.width(),
+      size_.height(),
+      GL_BGRA,
+      GL_UNSIGNED_INT_8_8_8_8_REV,
+      io_surface_.get(),
+      0);
+  if (cgl_error != kCGLNoError) {
+    LOG(ERROR) << "Error in CGLTexImageIOSurface2D";
+    return false;
+  }
+
+  return true;
+}
+
+void GLImageIOSurface::ReleaseTexImage(unsigned target) {
+}
+
+void GLImageIOSurface::WillUseTexImage() {
+}
+
+void GLImageIOSurface::DidUseTexImage() {
+}
+
+}  // namespace gfx