gfx/2d/ImageScaling.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef _MOZILLA_GFX_IMAGESCALING_H
   8 #define _MOZILLA_GFX_IMAGESCALING_H
   9
  10 #include "Types.h"
  11
  12 #include <vector>
  13 #include "Point.h"
  14
  15 namespace mozilla {
  16 namespace gfx {
  17
  18 class ImageHalfScaler {
  19  public:
  20   ImageHalfScaler(uint8_t* aData, int32_t aStride, const IntSize& aSize)
  21       : mOrigData(aData),
  22         mOrigStride(aStride),
  23         mOrigSize(aSize),
  24         mDataStorage(nullptr),
  25         mData(nullptr),
  26         mStride(0) {}
  27
  28   ~ImageHalfScaler() { delete[] mDataStorage; }
  29
  30   void ScaleForSize(const IntSize& aSize);
  31
  32   uint8_t* GetScaledData() const { return mData; }
  33   IntSize GetSize() const { return mSize; }
  34   uint32_t GetStride() const { return mStride; }
  35
  36  private:
  37   void HalfImage2D(uint8_t* aSource, int32_t aSourceStride,
  38                    const IntSize& aSourceSize, uint8_t* aDest,
  39                    uint32_t aDestStride);
  40   void HalfImageVertical(uint8_t* aSource, int32_t aSourceStride,
  41                          const IntSize& aSourceSize, uint8_t* aDest,
  42                          uint32_t aDestStride);
  43   void HalfImageHorizontal(uint8_t* aSource, int32_t aSourceStride,
  44                            const IntSize& aSourceSize, uint8_t* aDest,
  45                            uint32_t aDestStride);
  46
  47   // This is our SSE2 scaling function. Our destination must always be 16-byte
  48   // aligned and use a 16-byte aligned stride.
  49   void HalfImage2D_SSE2(uint8_t* aSource, int32_t aSourceStride,
  50                         const IntSize& aSourceSize, uint8_t* aDest,
  51                         uint32_t aDestStride);
  52   void HalfImageVertical_SSE2(uint8_t* aSource, int32_t aSourceStride,
  53                               const IntSize& aSourceSize, uint8_t* aDest,
  54                               uint32_t aDestStride);
  55   void HalfImageHorizontal_SSE2(uint8_t* aSource, int32_t aSourceStride,
  56                                 const IntSize& aSourceSize, uint8_t* aDest,
  57                                 uint32_t aDestStride);
  58
  59   void HalfImage2D_C(uint8_t* aSource, int32_t aSourceStride,
  60                      const IntSize& aSourceSize, uint8_t* aDest,
  61                      uint32_t aDestStride);
  62   void HalfImageVertical_C(uint8_t* aSource, int32_t aSourceStride,
  63                            const IntSize& aSourceSize, uint8_t* aDest,
  64                            uint32_t aDestStride);
  65   void HalfImageHorizontal_C(uint8_t* aSource, int32_t aSourceStride,
  66                              const IntSize& aSourceSize, uint8_t* aDest,
  67                              uint32_t aDestStride);
  68
  69   uint8_t* mOrigData;
  70   int32_t mOrigStride;
  71   IntSize mOrigSize;
  72
  73   uint8_t* mDataStorage;
  74   // Guaranteed 16-byte aligned
  75   uint8_t* mData;
  76   IntSize mSize;
  77   // Guaranteed 16-byte aligned
  78   uint32_t mStride;
  79 };
  80
  81 }  // namespace gfx
  82 }  // namespace mozilla
  83
  84 #endif