gecko-dev/gfx/2d/SourceSurfaceRawData.cpp

/* -*- 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 "SourceSurfaceRawData.h"

#include "DataSurfaceHelpers.h"
#include "Logging.h"
#include "mozilla/Types.h"  // for decltype

namespace mozilla {
namespace gfx {

void SourceSurfaceRawData::InitWrappingData(
    uint8_t* aData, const IntSize& aSize, int32_t aStride,
    SurfaceFormat aFormat, Factory::SourceSurfaceDeallocator aDeallocator,
    void* aClosure) {
  mRawData = aData;
  mSize = aSize;
  mStride = aStride;
  mFormat = aFormat;

  if (aDeallocator) {
    mOwnData = true;
  }
  mDeallocator = aDeallocator;
  mClosure = aClosure;
}

void SourceSurfaceRawData::GuaranteePersistance() {
  if (mOwnData) {
    return;
  }

  MOZ_ASSERT(!mDeallocator);
  uint8_t* oldData = mRawData;
  mRawData = new uint8_t[mStride * mSize.height];

  memcpy(mRawData, oldData, mStride * mSize.height);
  mOwnData = true;
}

void SourceSurfaceRawData::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
                                               SizeOfInfo& aInfo) const {
  aInfo.AddType(SurfaceType::DATA);
  if (mDeallocator) {
    aInfo.mUnknownBytes = mStride * mSize.height;
  } else if (mOwnData) {
    aInfo.mHeapBytes = mStride * mSize.height;
  }
}

bool SourceSurfaceAlignedRawData::Init(const IntSize& aSize,
                                       SurfaceFormat aFormat, bool aClearMem,
                                       uint8_t aClearValue, int32_t aStride) {
  mFormat = aFormat;
  mStride = aStride ? aStride
                    : GetAlignedStride<16>(aSize.width, BytesPerPixel(aFormat));

  size_t bufLen = BufferSizeFromStrideAndHeight(mStride, aSize.height);
  if (bufLen > 0) {
    bool zeroMem = aClearMem && !aClearValue;
    static_assert(sizeof(decltype(mArray[0])) == 1,
                  "mArray.Realloc() takes an object count, so its objects must "
                  "be 1-byte sized if we use bufLen");

    // AlignedArray uses cmalloc to zero mem for a fast path.
    mArray.Realloc(/* actually an object count */ bufLen, zeroMem);
    mSize = aSize;

    if (mArray && aClearMem && aClearValue) {
      memset(mArray, aClearValue, mStride * aSize.height);
    }
  } else {
    mArray.Dealloc();
    mSize.SizeTo(0, 0);
  }

  return mArray != nullptr;
}

void SourceSurfaceAlignedRawData::SizeOfExcludingThis(
    MallocSizeOf aMallocSizeOf, SizeOfInfo& aInfo) const {
  aInfo.AddType(SurfaceType::DATA_ALIGNED);
  aInfo.mHeapBytes = mArray.HeapSizeOfExcludingThis(aMallocSizeOf);
}

}  // namespace gfx
}  // namespace mozilla