/*
* compute image line size and bytes per pixel
* from bits per pixel and width
*/
int bmpComputePitch(int bpp, Uint32 width, Uint32 *pitch, BOOL does_round)
{
int linesize;
int bytespp = 1;
if(bpp == 1)
linesize = PIX2BYTES (width);
else if(bpp <= 4)
linesize = PIX2BYTES (width << 2);
else if (bpp <= 8)
linesize = width;
else if(bpp <= 16) {
linesize = width * 2;
bytespp = 2;
} else if(bpp <= 24) {
linesize = width * 3;
bytespp = 3;
} else {
linesize = width * 4;
bytespp = 4;
}
/* rows are DWORD right aligned */
if (does_round)
*pitch = (linesize + 3) & -4;
else
*pitch = linesize;
return bytespp;
}
/*
* compute image line size and bytes per pixel
* from bits per pixel and width
*/
void
GdComputeImagePitch(int bpp, int width, int *pitch, int *bytesperpixel)
{
int linesize;
int bytespp = 1;
if(bpp == 1)
linesize = PIX2BYTES(width);
else if(bpp <= 4)
linesize = PIX2BYTES(width<<2);
else if(bpp <= 8)
linesize = width;
else if(bpp <= 16) {
linesize = width * 2;
bytespp = 2;
} else if(bpp <= 24) {
linesize = width * 3;
bytespp = 3;
} else {
linesize = width * 4;
bytespp = 4;
}
/* rows are DWORD right aligned*/
*pitch = (linesize + 3) & ~3;
*bytesperpixel = bytespp;
}
