Source code

Revision control

Other Tools

Line Code
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "SurfacePipe.h"

#include <algorithm>  // for min

#include "Decoder.h"

namespace mozilla {
namespace image {

using namespace gfx;

using std::min;

Maybe<SurfaceInvalidRect> AbstractSurfaceSink::TakeInvalidRect() {
  if (mInvalidRect.IsEmpty()) {
    return Nothing();
  }

  SurfaceInvalidRect invalidRect;
  invalidRect.mInputSpaceRect = invalidRect.mOutputSpaceRect = mInvalidRect;

  // Forget about the invalid rect we're returning.
  mInvalidRect = IntRect();

  return Some(invalidRect);
}

uint8_t* AbstractSurfaceSink::DoResetToFirstRow() {
  mRow = 0;
  return GetRowPointer();
}

uint8_t* AbstractSurfaceSink::DoAdvanceRow() {
  if (mRow >= uint32_t(InputSize().height)) {
    return nullptr;
  }

  // If we're vertically flipping the output, we need to flip the invalid rect.
  // Since we're dealing with an axis-aligned rect, only the y coordinate needs
  // to change.
  int32_t invalidY = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
  mInvalidRect.UnionRect(mInvalidRect,
                         IntRect(0, invalidY, InputSize().width, 1));

  mRow = min(uint32_t(InputSize().height), mRow + 1);

  return mRow < uint32_t(InputSize().height) ? GetRowPointer() : nullptr;
}

nsresult SurfaceSink::Configure(const SurfaceConfig& aConfig) {
  // For non-paletted surfaces, the surface size is just the output size.
  IntSize surfaceSize = aConfig.mOutputSize;

  // Non-paletted surfaces should not have frame rects, so we just pass
  // AllocateFrame() a frame rect which covers the entire surface.
  IntRect frameRect(0, 0, surfaceSize.width, surfaceSize.height);

  // Allocate the frame.
  // XXX(seth): Once every Decoder subclass uses SurfacePipe, we probably want
  // to allocate the frame directly here and get rid of Decoder::AllocateFrame
  // altogether.
  nsresult rv = aConfig.mDecoder->AllocateFrame(
      surfaceSize, frameRect, aConfig.mFormat,
      /* aPaletteDepth */ 0, aConfig.mAnimParams);
  if (NS_FAILED(rv)) {
    return rv;
  }

  mImageData = aConfig.mDecoder->mImageData;
  mImageDataLength = aConfig.mDecoder->mImageDataLength;
  mFlipVertically = aConfig.mFlipVertically;

  MOZ_ASSERT(mImageData);
  MOZ_ASSERT(
      mImageDataLength ==
      uint32_t(surfaceSize.width * surfaceSize.height * sizeof(uint32_t)));

  ConfigureFilter(surfaceSize, sizeof(uint32_t));
  return NS_OK;
}

uint8_t* SurfaceSink::GetRowPointer() const {
  // If we're flipping vertically, reverse the order in which we traverse the
  // rows.
  uint32_t row = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;

  uint8_t* rowPtr = mImageData + row * InputSize().width * sizeof(uint32_t);

  MOZ_ASSERT(rowPtr >= mImageData);
  MOZ_ASSERT(rowPtr < mImageData + mImageDataLength);
  MOZ_ASSERT(rowPtr + InputSize().width * sizeof(uint32_t) <=
             mImageData + mImageDataLength);

  return rowPtr;
}

nsresult PalettedSurfaceSink::Configure(const PalettedSurfaceConfig& aConfig) {
  MOZ_ASSERT(aConfig.mFormat == SurfaceFormat::B8G8R8A8);

  // For paletted surfaces, the surface size is the size of the frame rect.
  IntSize surfaceSize = aConfig.mFrameRect.Size();

  // Allocate the frame.
  // XXX(seth): Once every Decoder subclass uses SurfacePipe, we probably want
  // to allocate the frame directly here and get rid of Decoder::AllocateFrame
  // altogether.
  nsresult rv = aConfig.mDecoder->AllocateFrame(
      aConfig.mOutputSize, aConfig.mFrameRect, aConfig.mFormat,
      aConfig.mPaletteDepth, aConfig.mAnimParams);
  if (NS_FAILED(rv)) {
    return rv;
  }

  mImageData = aConfig.mDecoder->mImageData;
  mImageDataLength = aConfig.mDecoder->mImageDataLength;
  mFlipVertically = aConfig.mFlipVertically;
  mFrameRect = aConfig.mFrameRect;

  MOZ_ASSERT(mImageData);
  MOZ_ASSERT(
      mImageDataLength ==
      uint32_t(mFrameRect.Width() * mFrameRect.Height() * sizeof(uint8_t)));

  ConfigureFilter(surfaceSize, sizeof(uint8_t));
  return NS_OK;
}

uint8_t* PalettedSurfaceSink::GetRowPointer() const {
  // If we're flipping vertically, reverse the order in which we traverse the
  // rows.
  uint32_t row = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;

  uint8_t* rowPtr = mImageData + row * InputSize().width * sizeof(uint8_t);

  MOZ_ASSERT(rowPtr >= mImageData);
  MOZ_ASSERT(rowPtr < mImageData + mImageDataLength);
  MOZ_ASSERT(rowPtr + InputSize().width * sizeof(uint8_t) <=
             mImageData + mImageDataLength);

  return rowPtr;
}

}  // namespace image
}  // namespace mozilla