YUV2RGB

YUV2RGB.cpp

static inline uint32_t YUV2RGB(int nY, int nU, int nV) {
  nY -= 16;
  nU -= 128;
  nV -= 128;
  if (nY < 0) nY = 0;

  // This is the floating point equivalent. We do the conversion in integer
  // because some Android devices do not have floating point in hardware.
  // nR = (int)(1.164 * nY + 1.596 * nV);
  // nG = (int)(1.164 * nY - 0.813 * nV - 0.391 * nU);
  // nB = (int)(1.164 * nY + 2.018 * nU);

  int nR = (int)(1192 * nY + 1634 * nV);
  int nG = (int)(1192 * nY - 833 * nV - 400 * nU);
  int nB = (int)(1192 * nY + 2066 * nU);

  nR = MIN(kMaxChannelValue, MAX(0, nR));
  nG = MIN(kMaxChannelValue, MAX(0, nG));
  nB = MIN(kMaxChannelValue, MAX(0, nB));

  nR = (nR >> 10) & 0xff;
  nG = (nG >> 10) & 0xff;
  nB = (nB >> 10) & 0xff;

  return 0xff000000 | (nR << 16) | (nG << 8) | nB;
}