1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/gfx/ozone/dri/dri_surface.h"
6
7#include <errno.h>
8#include <sys/mman.h>
9#include <sys/types.h>
10#include <xf86drm.h>
11
12#include "base/logging.h"
13#include "third_party/skia/include/core/SkBitmap.h"
14#include "third_party/skia/include/core/SkBitmapDevice.h"
15#include "third_party/skia/include/core/SkCanvas.h"
16#include "ui/gfx/ozone/dri/dri_skbitmap.h"
17#include "ui/gfx/ozone/dri/hardware_display_controller.h"
18#include "ui/gfx/skia_util.h"
19
20namespace gfx {
21
22namespace {
23
24// Extends the SkBitmapDevice to allow setting the SkPixelRef. We use the setter
25// to change the SkPixelRef such that the device always points to the
26// backbuffer.
27class CustomSkBitmapDevice : public SkBitmapDevice {
28 public:
29  CustomSkBitmapDevice(const SkBitmap& bitmap) : SkBitmapDevice(bitmap) {}
30  virtual ~CustomSkBitmapDevice() {}
31
32  void SetPixelRef(SkPixelRef* pixel_ref) { setPixelRef(pixel_ref, 0); }
33
34 private:
35  DISALLOW_COPY_AND_ASSIGN(CustomSkBitmapDevice);
36};
37
38}  // namespace
39
40////////////////////////////////////////////////////////////////////////////////
41// DriSurface implementation
42
43DriSurface::DriSurface(
44    HardwareDisplayController* controller)
45    : controller_(controller),
46      bitmaps_(),
47      front_buffer_(0) {
48}
49
50DriSurface::~DriSurface() {
51}
52
53bool DriSurface::Initialize() {
54  for (int i = 0; i < 2; ++i) {
55    bitmaps_[i].reset(CreateBuffer());
56    // TODO(dnicoara) Should select the configuration based on what the
57    // underlying system supports.
58    bitmaps_[i]->setConfig(SkBitmap::kARGB_8888_Config,
59                           controller_->get_mode().hdisplay,
60                           controller_->get_mode().vdisplay);
61
62    if (!bitmaps_[i]->Initialize()) {
63      return false;
64    }
65  }
66
67  skia_device_ = skia::AdoptRef(
68      new CustomSkBitmapDevice(*bitmaps_[front_buffer_ ^ 1].get()));
69  skia_canvas_ = skia::AdoptRef(new SkCanvas(skia_device_.get()));
70
71  return true;
72}
73
74uint32_t DriSurface::GetFramebufferId() const {
75  CHECK(bitmaps_[0].get() && bitmaps_[1].get());
76  return bitmaps_[front_buffer_ ^ 1]->get_framebuffer();
77}
78
79// This call is made after the hardware just started displaying our back buffer.
80// We need to update our pointer reference and synchronize the two buffers.
81void DriSurface::SwapBuffers() {
82  CHECK(bitmaps_[0].get() && bitmaps_[1].get());
83
84  // Update our front buffer pointer.
85  front_buffer_ ^= 1;
86
87  // Unlocking will unset the pixel pointer, so it won't be pointing to the old
88  // PixelRef.
89  skia_device_->accessBitmap(false).unlockPixels();
90  // Update the backing pixels for the bitmap device.
91  static_cast<CustomSkBitmapDevice*>(skia_device_.get())->SetPixelRef(
92      bitmaps_[front_buffer_ ^ 1]->pixelRef());
93  // Locking the pixels will set the pixel pointer based on the PixelRef value.
94  skia_device_->accessBitmap(false).lockPixels();
95
96  SkIRect device_damage;
97  skia_canvas_->getClipDeviceBounds(&device_damage);
98  SkRect damage = SkRect::Make(device_damage);
99
100  skia_canvas_->drawBitmapRectToRect(*bitmaps_[front_buffer_].get(),
101                                     &damage,
102                                     damage);
103}
104
105SkCanvas* DriSurface::GetDrawableForWidget() {
106  return skia_canvas_.get();
107}
108
109DriSkBitmap* DriSurface::CreateBuffer() {
110  return new DriSkBitmap(controller_->get_fd());
111}
112
113}  // namespace gfx
114