fg_blend_stripe

fg_blend_stripe.c

static inline uint32_t ov_clip_uintp2(int32_t val, uint32_t a)
{
    if (val > 0) {
        int32_t mask  = (1 << a) - 1;
        int32_t overflow = !!(val & (~mask));
        return ((-overflow) & mask) | (val & mask);
    } else {
        return 0;
    }
    #if 0
    return OVMIN(OVMAX(0, val), (1 << a) - 1);
    #endif
}

void fg_blend_stripe(int16_t *dstSampleOffsetY, int16_t *srcSampleOffsetY, int32_t *grainStripe, uint32_t widthComp, uint32_t blockHeight, uint8_t bitDepth)
{
  uint32_t  k, l;
  int32_t   grainSample;

  for (l = 0; l < blockHeight; l++) /* y direction */
  {
    for (k = 0; k < widthComp; k++) /* x direction */
    {
        grainSample   =   grainStripe[k + (l*widthComp)];
        grainSample   <<=  (bitDepth - 8);
        dstSampleOffsetY[k + (l*widthComp)] = (int16_t) ov_clip_uintp2(grainSample + srcSampleOffsetY[k + (l*widthComp)], bitDepth);
    }
  }
  return;
}