/* save_hicolour:
* Core save routine for 15/16 bpp images, by Martijn Versteegh.
*/
static int save_hicolour(png_structp png_ptr, BITMAP *bmp, int depth)
{
unsigned char *row, *p;
int i, j, c;
row = malloc(bmp->w * 3);
if (!row)
return 0;
for (i=0; i<bmp->h; i++) {
p = row;
for (j = 0; j < bmp->w; j++) {
c = getpixel(bmp, j, i);
if (depth == 15) {
*p++ = getr15(c);
*p++ = getg15(c);
*p++ = getb15(c);
}
else {
*p++ = getr16(c);
*p++ = getg16(c);
*p++ = getb16(c);
}
}
png_write_row(png_ptr, row);
}
free(row);
return 1;
}
/* save_rgb:
* Core save routine for 15/16/24 bpp images (original by Martijn Versteegh).
*/
static int save_rgb(png_structp png_ptr, BITMAP *bmp)
{
AL_CONST int depth = bitmap_color_depth(bmp);
unsigned char *rowdata;
int y, x;
ASSERT(depth == 15 || depth == 16 || depth == 24);
rowdata = (unsigned char *)malloc(bmp->w * 3);
if (!rowdata)
return 0;
for (y=0; y<bmp->h; y++) {
unsigned char *p = rowdata;
if (depth == 15) {
for (x = 0; x < bmp->w; x++) {
int c = getpixel(bmp, x, y);
*p++ = getr15(c);
*p++ = getg15(c);
*p++ = getb15(c);
}
}
else if (depth == 16) {
for (x = 0; x < bmp->w; x++) {
int c = getpixel(bmp, x, y);
*p++ = getr16(c);
*p++ = getg16(c);
*p++ = getb16(c);
}
}
else { /* depth == 24 */
for (x = 0; x < bmp->w; x++) {
int c = getpixel(bmp, x, y);
*p++ = getr24(c);
*p++ = getg24(c);
*p++ = getb24(c);
}
}
png_write_row(png_ptr, rowdata);
}
free(rowdata);
return 1;
}
/* getb_depth:
* Extracts the blue component (ranging 0-255) from a pixel in the format
* being used by the specified color depth.
*/
int getb_depth(int color_depth, int c)
{
switch (color_depth) {
case 8:
return getb8(c);
case 15:
return getb15(c);
case 16:
return getb16(c);
case 24:
return getb24(c);
case 32:
return getb32(c);
}
return 0;
}