/* -*- 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/. */

#ifndef _MOZILLA_GFX_IMAGESCALING_H

#define _MOZILLA_GFX_IMAGESCALING_H

#include "Types.h"

#include <vector>

#include "Point.h"

namespace mozilla {

namespace gfx {

class ImageHalfScaler

{

public:

  ImageHalfScaler(uint8_t *aData, int32_t aStride, const IntSize &aSize)

    : mOrigData(aData), mOrigStride(aStride), mOrigSize(aSize)

    , mDataStorage(nullptr)

    , mData(nullptr)

    , mStride(0)

  {

  }

  ~ImageHalfScaler()

  {

    delete [] mDataStorage;

  }

  void ScaleForSize(const IntSize &aSize);

  uint8_t *GetScaledData() const { return mData; }

  IntSize GetSize() const { return mSize; }

  uint32_t GetStride() const { return mStride; }

private:

  void HalfImage2D(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                   uint8_t *aDest, uint32_t aDestStride);

  void HalfImageVertical(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                         uint8_t *aDest, uint32_t aDestStride);

  void HalfImageHorizontal(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                           uint8_t *aDest, uint32_t aDestStride);

  // This is our SSE2 scaling function. Our destination must always be 16-byte

  // aligned and use a 16-byte aligned stride.

  void HalfImage2D_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                        uint8_t *aDest, uint32_t aDestStride);

  void HalfImageVertical_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                              uint8_t *aDest, uint32_t aDestStride);

  void HalfImageHorizontal_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                                uint8_t *aDest, uint32_t aDestStride);

  void HalfImage2D_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                     uint8_t *aDest, uint32_t aDestStride);

  void HalfImageVertical_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                           uint8_t *aDest, uint32_t aDestStride);

  void HalfImageHorizontal_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

                             uint8_t *aDest, uint32_t aDestStride);

  uint8_t *mOrigData;

  int32_t mOrigStride;

  IntSize mOrigSize;

  uint8_t *mDataStorage;

  // Guaranteed 16-byte aligned

  uint8_t *mData;

  IntSize mSize;

  // Guaranteed 16-byte aligned

  uint32_t mStride;

};

} // namespace gfx

} // namespace mozilla

#endif