Support removal of DRI platform

ui/gfx/ozone/impl/dri_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 "ui/gfx/ozone/impl/dri_surface.h"
-
-#include <errno.h>
-#include <sys/mman.h>
-#include <sys/types.h>
-#include <xf86drm.h>
-
-#include "base/logging.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/core/SkBitmapDevice.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-#include "ui/gfx/ozone/impl/dri_skbitmap.h"
-#include "ui/gfx/ozone/impl/hardware_display_controller.h"
-#include "ui/gfx/skia_util.h"
-
-namespace gfx {
-
-namespace {
-
-// Extends the SkBitmapDevice to allow setting the SkPixelRef. We use the setter
-// to change the SkPixelRef such that the device always points to the
-// backbuffer.
-class CustomSkBitmapDevice : public SkBitmapDevice {
- public:
-  CustomSkBitmapDevice(const SkBitmap& bitmap) : SkBitmapDevice(bitmap) {}
-  virtual ~CustomSkBitmapDevice() {}
-
-  void SetPixelRef(SkPixelRef* pixel_ref) { setPixelRef(pixel_ref, 0); }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CustomSkBitmapDevice);
-};
-
-}  // namespace
-
-////////////////////////////////////////////////////////////////////////////////
-// DriSurface implementation
-
-DriSurface::DriSurface(
-    HardwareDisplayController* controller)
-    : controller_(controller),
-      bitmaps_(),
-      front_buffer_(0) {
-}
-
-DriSurface::~DriSurface() {
-}
-
-bool DriSurface::Initialize() {
-  for (int i = 0; i < 2; ++i) {
-    bitmaps_[i].reset(CreateBuffer());
-    // TODO(dnicoara) Should select the configuration based on what the
-    // underlying system supports.
-    bitmaps_[i]->setConfig(SkBitmap::kARGB_8888_Config,
-                           controller_->get_mode().hdisplay,
-                           controller_->get_mode().vdisplay);
-
-    if (!bitmaps_[i]->Initialize()) {
-      return false;
-    }
-  }
-
-  skia_device_ = skia::AdoptRef(
-      new CustomSkBitmapDevice(*bitmaps_[front_buffer_ ^ 1].get()));
-  skia_canvas_ = skia::AdoptRef(new SkCanvas(skia_device_.get()));
-
-  return true;
-}
-
-uint32_t DriSurface::GetFramebufferId() const {
-  CHECK(bitmaps_[0].get() && bitmaps_[1].get());
-  return bitmaps_[front_buffer_ ^ 1]->get_framebuffer();
-}
-
-// This call is made after the hardware just started displaying our back buffer.
-// We need to update our pointer reference and synchronize the two buffers.
-void DriSurface::SwapBuffers() {
-  CHECK(bitmaps_[0].get() && bitmaps_[1].get());
-
-  // Update our front buffer pointer.
-  front_buffer_ ^= 1;
-
-  // Unlocking will unset the pixel pointer, so it won't be pointing to the old
-  // PixelRef.
-  skia_device_->accessBitmap(false).unlockPixels();
-  // Update the backing pixels for the bitmap device.
-  static_cast<CustomSkBitmapDevice*>(skia_device_.get())->SetPixelRef(
-      bitmaps_[front_buffer_ ^ 1]->pixelRef());
-  // Locking the pixels will set the pixel pointer based on the PixelRef value.
-  skia_device_->accessBitmap(false).lockPixels();
-
-  SkIRect device_damage;
-  skia_canvas_->getClipDeviceBounds(&device_damage);
-  SkRect damage = SkRect::Make(device_damage);
-
-  skia_canvas_->drawBitmapRectToRect(*bitmaps_[front_buffer_].get(),
-                                     &damage,
-                                     damage);
-}
-
-SkCanvas* DriSurface::GetDrawableForWidget() {
-  return skia_canvas_.get();
-}
-
-DriSkBitmap* DriSurface::CreateBuffer() {
-  return new DriSkBitmap(controller_->get_fd());
-}
-
-}  // namespace gfx