image/SurfacePipe.cpp
author Jeff Gilbert <jgilbert@mozilla.com>
Thu, 11 Oct 2018 17:18:12 -0700
changeset 442674 b7e7638dbfd10f04f0eea8f9d886266abe791378
parent 420273 87a0a6e103d8151d0e40929580545e3fbcc6b490
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1399501 - !MakeCurrent() should clear the current context. - r=kvark Make MarkDestroyed call MakeCurrent(force=true) to clear the current context also. Differential Revision: https://phabricator.services.mozilla.com/D9289

/* -*- 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