git.maemo.org Git - mardrone/blob - mardrone/ARDrone_SDK_Version_1_8_20110726/ARDroneLib/VLIB/P264/p264_merge.c

   1 #include <VLIB/P264/p264_merge.h>
   2
   3 // merge scaled residual data from iTransform and prediction data already located in the output picture
   4 void p264_merge_4x4 (int16_t* residual,uint8_t* picture, uint32_t x, uint32_t y, uint32_t linesize)
   5 {
   6   uint32_t i;
   7   int16_t pixel;
   8   picture += y*linesize+x;
   9   for (i=0;i<4;i++)
  10   {
  11     pixel = (int16_t)(((int16_t)*picture) + (((*residual++)+32)>>6));
  12     if (pixel > 0xFF)
  13       *picture++ = 0xFF;
  14     else if (pixel < 0)
  15       *picture++ = 0;
  16     else
  17       *picture++ = pixel;
  18     pixel = (int16_t)(((int16_t)*picture) + (((*residual++)+32)>>6));
  19     if (pixel > 0xFF)
  20       *picture++ = 0xFF;
  21     else if (pixel < 0)
  22       *picture++ = 0;
  23     else
  24       *picture++ = pixel;
  25     pixel = (int16_t)(((int16_t)*picture) + (((*residual++)+32)>>6));
  26     if (pixel > 0xFF)
  27       *picture++ = 0xFF;
  28     else if (pixel < 0)
  29       *picture++ = 0;
  30     else
  31       *picture++ = pixel;
  32     pixel = (int16_t)(((int16_t)*picture) + (((*residual++)+32)>>6));
  33     if (pixel > 0xFF)
  34       *picture = 0xFF;
  35     else if (pixel < 0)
  36       *picture = 0;
  37     else
  38       *picture = pixel;
  39     // jump to next line
  40     picture += linesize-3;
  41   }
  42 }