text: /*
   * Copyright (c) 2013 Paul B Mahol
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #ifndef AVFILTER_BLEND_H
  #define AVFILTER_BLEND_H
  
  #include "libavutil/eval.h"
  #include "avfilter.h"
  
  enum BlendMode {
      BLEND_UNSET = -1,
      BLEND_NORMAL,
      BLEND_ADDITION,
      BLEND_AND,
      BLEND_AVERAGE,
      BLEND_BURN,
      BLEND_DARKEN,
      BLEND_DIFFERENCE,
      BLEND_DIFFERENCE128,
      BLEND_DIVIDE,
      BLEND_DODGE,
      BLEND_EXCLUSION,
      BLEND_HARDLIGHT,
      BLEND_LIGHTEN,
      BLEND_MULTIPLY,
      BLEND_NEGATION,
      BLEND_OR,
      BLEND_OVERLAY,
      BLEND_PHOENIX,
      BLEND_PINLIGHT,
      BLEND_REFLECT,
      BLEND_SCREEN,
      BLEND_SOFTLIGHT,
      BLEND_SUBTRACT,
      BLEND_VIVIDLIGHT,
      BLEND_XOR,
      BLEND_HARDMIX,
      BLEND_LINEARLIGHT,
      BLEND_GLOW,
      BLEND_ADDITION128,
      BLEND_MULTIPLY128,
      BLEND_HEAT,
      BLEND_FREEZE,
      BLEND_EXTREMITY,
      BLEND_NB
  };
  
  typedef struct FilterParams {
      enum BlendMode mode;
      double opacity;
      AVExpr *e;
      char *expr_str;
      void (*blend)(const uint8_t *top, ptrdiff_t top_linesize,
                    const uint8_t *bottom, ptrdiff_t bottom_linesize,
                    uint8_t *dst, ptrdiff_t dst_linesize,
                    ptrdiff_t width, ptrdiff_t height,
                    struct FilterParams *param, double *values, int starty);
  } FilterParams;
  
  void ff_blend_init(FilterParams *param, int is_16bit);
  void ff_blend_init_x86(FilterParams *param, int is_16bit);
  
  #endif /* AVFILTER_BLEND_H */
  