gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc

+// Copyright 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 "content/common/gpu/client/gpu_memory_buffer_impl_io_surface.h"
+
+#include "base/logging.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/io_surface_support_mac.h"
+
+namespace content {
+
+GpuMemoryBufferImplIOSurface::GpuMemoryBufferImplIOSurface(
+    gfx::Size size, unsigned internalformat)
+    : GpuMemoryBufferImpl(size, internalformat),
+      io_surface_support_(IOSurfaceSupport::Initialize()) {
+  CHECK(io_surface_support_);
+}
+
+GpuMemoryBufferImplIOSurface::~GpuMemoryBufferImplIOSurface() {
+}
+
+// static
+bool GpuMemoryBufferImplIOSurface::IsFormatSupported(unsigned internalformat) {
+  switch (internalformat) {
+    case GL_BGRA8_EXT:
+      return true;
+    default:
+      return false;
+  }
+}
+
+// static
+uint32 GpuMemoryBufferImplIOSurface::PixelFormat(unsigned internalformat) {
+  switch (internalformat) {
+    case GL_BGRA8_EXT:
+      return 'BGRA';
+    default:
+      NOTREACHED();
+      return 0;
+  }
+}
+
+bool GpuMemoryBufferImplIOSurface::Initialize(
+    gfx::GpuMemoryBufferHandle handle) {
+  io_surface_.reset(io_surface_support_->IOSurfaceLookup(handle.io_surface_id));
+  if (!io_surface_) {
+    VLOG(1) << "IOSurface lookup failed";
+    return false;
+  }
+
+  return true;
+}
+
+void GpuMemoryBufferImplIOSurface::Map(AccessMode mode, void** vaddr) {
+  DCHECK(!mapped_);
+  io_surface_support_->IOSurfaceLock(io_surface_, 0, NULL);
+  *vaddr = io_surface_support_->IOSurfaceGetBaseAddress(io_surface_);
+  mapped_ = true;
+}
+
+void GpuMemoryBufferImplIOSurface::Unmap() {
+  DCHECK(mapped_);
+  io_surface_support_->IOSurfaceUnlock(io_surface_, 0, NULL);
+  mapped_ = false;
+}
+
+uint32 GpuMemoryBufferImplIOSurface::GetStride() const {
+  return io_surface_support_->IOSurfaceGetBytesPerRow(io_surface_);
+}
+
+gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
+  gfx::GpuMemoryBufferHandle handle;
+  handle.type = gfx::IO_SURFACE_BUFFER;
+  handle.io_surface_id = io_surface_support_->IOSurfaceGetID(io_surface_);
+  return handle;
+}
+
+}  // namespace content