Function cups_raster_write

cups/raster-stream.c:1769–1894

 */

static ssize_t				/* O - Number of bytes written */
cups_raster_write(
    cups_raster_t       *r,		/* I - Raster stream */
    const unsigned char *pixels)	/* I - Pixel data to write */
{
  const unsigned char	*start,		/* Start of sequence */
			*ptr,		/* Current pointer in sequence */
			*pend,		/* End of raster buffer */
			*plast;		/* Pointer to last pixel */
  unsigned char		*wptr;		/* Pointer into write buffer */
  unsigned		bpp,		/* Bytes per pixel */
			count;		/* Count */
  _cups_copyfunc_t	cf;		/* Copy function */


  DEBUG_printf(("3cups_raster_write(r=%p, pixels=%p)", (void *)r, (void *)pixels));

 /*
  * Determine whether we need to swap bytes...
  */

  if (r->swapped && (r->header.cupsBitsPerColor == 16 || r->header.cupsBitsPerPixel == 12 || r->header.cupsBitsPerPixel == 16))
  {
    DEBUG_puts("4cups_raster_write: Swapping bytes when writing.");
    cf = (_cups_copyfunc_t)cups_swap_copy;
  }
  else
    cf = (_cups_copyfunc_t)memcpy;

  /*
  * Allocate a write buffer as needed...
  */

  count = r->header.cupsBytesPerLine * 2;
  if (count < 65536)
    count = 65536;

  if ((size_t)count > r->bufsize)
  {
    if (r->buffer)
      wptr = realloc(r->buffer, count);
    else
      wptr = malloc(count);

    if (!wptr)
    {
      DEBUG_printf(("4cups_raster_write: Unable to allocate " CUPS_LLFMT " bytes for raster buffer: %s", CUPS_LLCAST count, strerror(errno)));
      return (-1);
    }

    r->buffer  = wptr;
    r->bufsize = count;
  }

 /*
  * Write the row repeat count...
  */