summaryrefslogtreecommitdiffstats
path: root/gfx/layers/basic/BasicImages.cpp
blob: ed944720787a34e5fcf585116df2e63f18aa141f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <stdint.h>                     // for uint8_t, uint32_t
#include "BasicLayers.h"                // for BasicLayerManager
#include "ImageContainer.h"             // for PlanarYCbCrImage, etc
#include "ImageTypes.h"                 // for ImageFormat, etc
#include "cairo.h"                      // for cairo_user_data_key_t
#include "gfxASurface.h"                // for gfxASurface, etc
#include "gfxPlatform.h"                // for gfxPlatform, gfxImageFormat
#include "gfxUtils.h"                   // for gfxUtils
#include "mozilla/mozalloc.h"           // for operator delete[], etc
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
#include "nsAutoRef.h"                  // for nsCountedRef
#include "nsCOMPtr.h"                   // for already_AddRefed
#include "nsDebug.h"                    // for NS_ERROR, NS_ASSERTION
#include "nsISupportsImpl.h"            // for Image::Release, etc
#include "nsThreadUtils.h"              // for NS_IsMainThread
#include "mozilla/gfx/Point.h"          // for IntSize
#include "gfx2DGlue.h"
#include "YCbCrUtils.h"                 // for YCbCr conversions

namespace mozilla {
namespace layers {

class BasicPlanarYCbCrImage : public RecyclingPlanarYCbCrImage
{
public:
  BasicPlanarYCbCrImage(const gfx::IntSize& aScaleHint, gfxImageFormat aOffscreenFormat, BufferRecycleBin *aRecycleBin)
    : RecyclingPlanarYCbCrImage(aRecycleBin)
    , mScaleHint(aScaleHint)
    , mStride(0)
    , mDelayedConversion(false)
  {
    SetOffscreenFormat(aOffscreenFormat);
  }

  ~BasicPlanarYCbCrImage()
  {
    if (mDecodedBuffer) {
      // Right now this only happens if the Image was never drawn, otherwise
      // this will have been tossed away at surface destruction.
      mRecycleBin->RecycleBuffer(Move(mDecodedBuffer), mSize.height * mStride);
    }
  }

  virtual bool CopyData(const Data& aData) override;
  virtual void SetDelayedConversion(bool aDelayed) override { mDelayedConversion = aDelayed; }

  already_AddRefed<gfx::SourceSurface> GetAsSourceSurface() override;

  virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
  {
    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
  }

  virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
  {
    size_t size = RecyclingPlanarYCbCrImage::SizeOfExcludingThis(aMallocSizeOf);
    size += aMallocSizeOf(mDecodedBuffer.get());
    return size;
  }

private:
  UniquePtr<uint8_t[]> mDecodedBuffer;
  gfx::IntSize mScaleHint;
  int mStride;
  bool mDelayedConversion;
};

class BasicImageFactory : public ImageFactory
{
public:
  BasicImageFactory() {}

  virtual RefPtr<PlanarYCbCrImage>
  CreatePlanarYCbCrImage(const gfx::IntSize& aScaleHint, BufferRecycleBin* aRecycleBin)
  {
    return new BasicPlanarYCbCrImage(aScaleHint, gfxPlatform::GetPlatform()->GetOffscreenFormat(), aRecycleBin);
  }
};

bool
BasicPlanarYCbCrImage::CopyData(const Data& aData)
{
  RecyclingPlanarYCbCrImage::CopyData(aData);

  if (mDelayedConversion) {
    return false;
  }

  // Do some sanity checks to prevent integer overflow
  if (aData.mYSize.width > PlanarYCbCrImage::MAX_DIMENSION ||
      aData.mYSize.height > PlanarYCbCrImage::MAX_DIMENSION) {
    NS_ERROR("Illegal image source width or height");
    return false;
  }

  gfx::SurfaceFormat format = gfx::ImageFormatToSurfaceFormat(GetOffscreenFormat());

  gfx::IntSize size(mScaleHint);
  gfx::GetYCbCrToRGBDestFormatAndSize(aData, format, size);
  if (size.width > PlanarYCbCrImage::MAX_DIMENSION ||
      size.height > PlanarYCbCrImage::MAX_DIMENSION) {
    NS_ERROR("Illegal image dest width or height");
    return false;
  }

  gfxImageFormat iFormat = gfx::SurfaceFormatToImageFormat(format);
  mStride = gfxASurface::FormatStrideForWidth(iFormat, size.width);
  mDecodedBuffer = AllocateBuffer(size.height * mStride);
  if (!mDecodedBuffer) {
    // out of memory
    return false;
  }

  gfx::ConvertYCbCrToRGB(aData, format, size, mDecodedBuffer.get(), mStride);
  SetOffscreenFormat(iFormat);
  mSize = size;

  return true;
}

already_AddRefed<gfx::SourceSurface>
BasicPlanarYCbCrImage::GetAsSourceSurface()
{
  NS_ASSERTION(NS_IsMainThread(), "Must be main thread");

  if (mSourceSurface) {
    RefPtr<gfx::SourceSurface> surface(mSourceSurface);
    return surface.forget();
  }

  if (!mDecodedBuffer) {
    return PlanarYCbCrImage::GetAsSourceSurface();
  }

  gfxImageFormat format = GetOffscreenFormat();

  RefPtr<gfx::SourceSurface> surface;
  {
    // Create a DrawTarget so that we can own the data inside mDecodeBuffer.
    // We create the target out of mDecodedBuffer, and get a snapshot from it.
    // The draw target is destroyed on scope exit and the surface owns the data.
    RefPtr<gfx::DrawTarget> drawTarget
      = gfxPlatform::CreateDrawTargetForData(mDecodedBuffer.get(),
                                             mSize,
                                             mStride,
                                             gfx::ImageFormatToSurfaceFormat(format));
    if (!drawTarget) {
      return nullptr;
    }

    surface = drawTarget->Snapshot();
  }

  mRecycleBin->RecycleBuffer(Move(mDecodedBuffer), mSize.height * mStride);

  mSourceSurface = surface;
  return surface.forget();
}


ImageFactory*
BasicLayerManager::GetImageFactory()
{
  if (!mFactory) {
    mFactory = new BasicImageFactory();
  }

  return mFactory.get();
}

} // namespace layers
} // namespace mozilla