gfx/2d/ConvolutionFilter.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_CONVOLUTION_FILTER_H_
   8 #define MOZILLA_GFX_CONVOLUTION_FILTER_H_
   9
  10 #include "mozilla/UniquePtr.h"
  11
  12 namespace skia {
  13 class SkConvolutionFilter1D;
  14 }
  15
  16 namespace mozilla {
  17 namespace gfx {
  18
  19 class ConvolutionFilter final {
  20  public:
  21   ConvolutionFilter();
  22   ~ConvolutionFilter();
  23
  24   int32_t MaxFilter() const;
  25   int32_t NumValues() const;
  26
  27   bool GetFilterOffsetAndLength(int32_t aRowIndex, int32_t* aResultOffset,
  28                                 int32_t* aResultLength);
  29
  30   void ConvolveHorizontally(const uint8_t* aSrc, uint8_t* aDst, bool aHasAlpha);
  31   void ConvolveVertically(uint8_t* const* aSrc, uint8_t* aDst,
  32                           int32_t aRowIndex, int32_t aRowSize, bool aHasAlpha);
  33
  34   enum class ResizeMethod { BOX, LANCZOS3 };
  35
  36   bool ComputeResizeFilter(ResizeMethod aResizeMethod, int32_t aSrcSize,
  37                            int32_t aDstSize);
  38
  39   static inline size_t PadBytesForSIMD(size_t aBytes) {
  40     return (aBytes + 31) & ~31;
  41   }
  42
  43   const skia::SkConvolutionFilter1D& GetSkiaFilter() const {
  44     return *mFilter.get();
  45   }
  46
  47  private:
  48   UniquePtr<skia::SkConvolutionFilter1D> mFilter;
  49 };
  50
  51 }  // namespace gfx
  52 }  // namespace mozilla
  53
  54 #endif /* MOZILLA_GFX_CONVOLUTION_FILTER_H_ */