#include <cstdint>

extern int RGB_LOW_BITS_MASK;

void Scanlines (uint8_t *srcPtr, uint32_t srcPitch, uint8_t *,
                uint8_t *dstPtr, uint32_t dstPitch, int width, int height)
{
  uint8_t *nextLine, *finish;

  nextLine = dstPtr + dstPitch;

  do {
    uint32_t *bP = (uint32_t *) srcPtr;
    uint32_t *dP = (uint32_t *) dstPtr;
    uint32_t *nL = (uint32_t *) nextLine;
    uint32_t currentPixel;
    uint32_t nextPixel;

    finish = (uint8_t *) bP + ((width+2) << 1);
    nextPixel = *bP++;

    do {
      currentPixel = nextPixel;
      nextPixel = *bP++;
      uint32_t colorA, colorB;

#ifdef WORDS_BIGENDIAN
      colorA = currentPixel >> 16;
      colorB = currentPixel & 0xffff;
#else
      colorA = currentPixel & 0xffff;
      colorB = currentPixel >> 16;
#endif

      *(dP) = colorA | colorA<<16;
      *(nL) = 0;

#ifdef WORDS_BIGENDIAN
      colorA = nextPixel >> 16;
#else
      colorA = nextPixel & 0xffff;
#endif

      *(dP + 1) = colorB | (colorB << 16);
      *(nL + 1) = 0;

      dP += 2;
      nL += 2;
    } while ((uint8_t *) bP < finish);

    srcPtr += srcPitch;
    dstPtr += dstPitch << 1;
    nextLine += dstPitch << 1;
  }
  while (--height);
}

void Scanlines32(uint8_t *srcPtr, uint32_t srcPitch, uint8_t * /* deltaPtr */,
                 uint8_t *dstPtr, uint32_t dstPitch, int width, int height)
{
  uint8_t *nextLine, *finish;

  nextLine = dstPtr + dstPitch;

  do {
    uint32_t *bP = (uint32_t *) srcPtr;
    uint32_t *dP = (uint32_t *) dstPtr;
    uint32_t *nL = (uint32_t *) nextLine;
    uint32_t currentPixel;
    uint32_t nextPixel;

    finish = (uint8_t *) bP + ((width+1) << 2);
    nextPixel = *bP++;

    do {
      currentPixel = nextPixel;
      nextPixel = *bP++;

      uint32_t colorA, colorB;

      colorA = currentPixel;
      colorB = nextPixel;

      *(dP) = colorA;
      *(dP+1) = colorA;
      *(nL) = 0;
      *(nL+1) = 0;

      *(dP + 2) = colorB;
      *(dP + 3) = colorB;
      *(nL+2) = 0;
      *(nL+3) = 0;

      nextPixel = *bP++;

      dP += 4;
      nL += 4;
    } while ((uint8_t *) bP < finish);

    srcPtr += srcPitch;
    dstPtr += dstPitch << 1;
    nextLine += dstPitch << 1;
  }
  while (--height);
}

void ScanlinesTV(uint8_t *srcPtr, uint32_t srcPitch, uint8_t * /* deltaPtr */,
                 uint8_t *dstPtr, uint32_t dstPitch, int width, int height)
{
  uint8_t *nextLine, *finish;
  uint32_t colorMask = ~(RGB_LOW_BITS_MASK | (RGB_LOW_BITS_MASK << 16));

  nextLine = dstPtr + dstPitch;

  do {
    uint32_t *bP = (uint32_t *) srcPtr;
    uint32_t *dP = (uint32_t *) dstPtr;
    uint32_t *nL = (uint32_t *) nextLine;
    uint32_t currentPixel;
    uint32_t nextPixel;

    finish = (uint8_t *) bP + ((width+2) << 1);
    nextPixel = *bP++;

    do {
      currentPixel = nextPixel;
      nextPixel = *bP++;

      uint32_t colorA, colorB;

#ifdef WORDS_BIGENDIAN
      colorA = currentPixel >> 16;
      colorB = currentPixel & 0xFFFF;
#else
      colorA = currentPixel & 0xFFFF;
      colorB = currentPixel >> 16;
#endif

      *(dP) = colorA = colorA | ((((colorA & colorMask) >> 1) +
                                  ((colorB & colorMask) >> 1))) << 16;
      colorA = ((colorA & colorMask) >> 1);
      colorA += ((colorA & colorMask) >> 1);
      *(nL) = colorA;

      colorA = nextPixel & 0xFFFF;

      *(dP + 1) = colorB = colorB | ((((colorA & colorMask) >> 1) +
                                      ((colorB & colorMask) >> 1))) << 16;
      colorB = ((colorB & colorMask) >> 1);
      colorB += ((colorB & colorMask) >> 1);

      *(nL + 1) = colorB;

      dP += 2;
      nL += 2;
    } while ((uint8_t *) bP < finish);

    srcPtr += srcPitch;
    dstPtr += dstPitch << 1;
    nextLine += dstPitch << 1;
  }
  while (--height);
}

void ScanlinesTV32(uint8_t *srcPtr, uint32_t srcPitch, uint8_t * /* deltaPtr */,
                   uint8_t *dstPtr, uint32_t dstPitch, int width, int height)
{
  uint8_t *nextLine, *finish;
  uint32_t colorMask = ~RGB_LOW_BITS_MASK;

  nextLine = dstPtr + dstPitch;

  do {
    uint32_t *bP = (uint32_t *) srcPtr;
    uint32_t *dP = (uint32_t *) dstPtr;
    uint32_t *nL = (uint32_t *) nextLine;
    uint32_t currentPixel;
    uint32_t nextPixel;

    finish = (uint8_t *) bP + ((width+1) << 2);
    nextPixel = *bP++;

    do {
      currentPixel = nextPixel;
      nextPixel = *bP++;

      uint32_t colorA, colorB, temp;

      colorA = currentPixel;
      colorB = nextPixel;

      *(dP) = colorA;
      *(dP+1) = temp = ((colorA & colorMask) >> 1) +
        ((colorB & colorMask) >> 1);
      temp = ((temp & colorMask) >> 1);
      temp += ((temp & colorMask) >> 1);
      colorA = ((colorA & colorMask) >> 1);
      colorA += ((colorA & colorMask) >> 1);

      *(nL) = colorA;
      *(nL+1) = temp;

      dP += 2;
      nL += 2;
    } while ((uint8_t *) bP < finish);

    srcPtr += srcPitch;
    dstPtr += dstPitch << 1;
    nextLine += dstPitch << 1;
  }
  while (--height);
}
