src/pdfio.c
void
l_pdfSetG4ImageMask(l_int32  flag)
{
    var_WRITE_G4_IMAGE_MASK = flag;
}
/*!
 *  l_pdfSetG4ImageMask()
 *
 *      Input:  flag (1 for writing g4 data as fg only through a mask;
 *                    0 for writing fg and bg)
 *      Return: void
 *
 *  Notes:
 *      (1) The default is for writing only the fg (through the mask).
 *          That way when you write a 1 bpp image, the bg is transparent,
 *          so any previously written image remains visible behind it.
 */
l_pdfSetG4ImageMask()
Input:  flag (1 for writing g4 data as fg only through a mask;
0 for writing fg and bg)
Return: void

(1) The default is for writing only the fg (through the mask).
That way when you write a 1 bpp image, the bg is transparent,
so any previously written image remains visible behind it.
l_pdfSetG4ImageMask () Input : flag ( 1 for writing g4 data as fg only through a mask ; 0 for writing fg and bg ) Return : void ( 1 ) The default is for writing only the fg ( through the mask ) . That way when you write a 1 bpp image the bg is transparent so any previously written image remains visible behind it .
void
l_pdfSetG4ImageMask(l_int32  flag)
{
    var_WRITE_G4_IMAGE_MASK = flag;
}
void l_pdfSetG4ImageMask ( l_int32 flag ) { var_WRITE_G4_IMAGE_MASK = flag ; }
l_pdfSetG4ImageMask()
      Input:  flag (1 for writing g4 data as fg only through a mask;
                    0 for writing fg and bg)
      Return: void
l_pdfSetG4ImageMask () Input : flag ( 1 for writing g4 data as fg only through a mask ; 0 for writing fg and bg ) Return : void