/* -*- 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