text: /*
   * Colorspace conversion defines
   * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
   *
   * 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
   */
  
  /**
   * @file libavcodec/colorspace.h
   * Various defines for YUV<->RGB conversion
   */
  
  #ifndef AVCODEC_COLORSPACE_H
  #define AVCODEC_COLORSPACE_H
  
  #define SCALEBITS 10
  #define ONE_HALF  (1 << (SCALEBITS - 1))
  #define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
  
  #define YUV_TO_RGB1_CCIR(cb1, cr1)\
  {\
      cb = (cb1) - 128;\
      cr = (cr1) - 128;\
      r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
      g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
              ONE_HALF;\
      b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
  }
  
  #define YUV_TO_RGB2_CCIR(r, g, b, y1)\
  {\
      y = ((y1) - 16) * FIX(255.0/219.0);\
      r = cm[(y + r_add) >> SCALEBITS];\
      g = cm[(y + g_add) >> SCALEBITS];\
      b = cm[(y + b_add) >> SCALEBITS];\
  }
  
  #define YUV_TO_RGB1(cb1, cr1)\
  {\
      cb = (cb1) - 128;\
      cr = (cr1) - 128;\
      r_add = FIX(1.40200) * cr + ONE_HALF;\
      g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\
      b_add = FIX(1.77200) * cb + ONE_HALF;\
  }
  
  #define YUV_TO_RGB2(r, g, b, y1)\
  {\
      y = (y1) << SCALEBITS;\
      r = cm[(y + r_add) >> SCALEBITS];\
      g = cm[(y + g_add) >> SCALEBITS];\
      b = cm[(y + b_add) >> SCALEBITS];\
  }
  
  #define Y_CCIR_TO_JPEG(y)\
   cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]
  
  #define Y_JPEG_TO_CCIR(y)\
   (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
  
  #define C_CCIR_TO_JPEG(y)\
   cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]
  
  /* NOTE: the clamp is really necessary! */
  static inline int C_JPEG_TO_CCIR(int y) {
      y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS);
      if (y < 16)
          y = 16;
      return y;
  }
  
  
  #define RGB_TO_Y(r, g, b) \
  ((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \
    FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS)
  
  #define RGB_TO_U(r1, g1, b1, shift)\
  (((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +         \
       FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  
  #define RGB_TO_V(r1, g1, b1, shift)\
  (((FIX(0.50000) * r1 - FIX(0.41869) * g1 -           \
     FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  
  #define RGB_TO_Y_CCIR(r, g, b) \
  ((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
    FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
  
  #define RGB_TO_U_CCIR(r1, g1, b1, shift)\
  (((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 +         \
       FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  
  #define RGB_TO_V_CCIR(r1, g1, b1, shift)\
  (((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 -           \
     FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  
  #endif /* AVCODEC_COLORSPACE_H */
  