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riven_hgr: work on transparent overlays

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This commit is contained in:
Vince Weaver 2024-05-17 16:56:29 -04:00
parent 9704bbd11b
commit c5bcf74f30
3 changed files with 15 additions and 0 deletions
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games/riven_hgr/movie1/overlays/maglev_overlay.png
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games/riven_hgr/movie1/overlays/maglev_overlay_transparent.png Normal file
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15
utils/gr-utils/loadpng.c
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@ -3,6 +3,8 @@
/* It's not interleaved like an actual Apple II */
/* But the top/bottom are pre-packed into a naive 40x24 array */
/* Note there's a hack to treat color 17 (0xf5ff00) as an alias for color 10 */
/* for transparency reasons */
#include <stdio.h>
#include <stdlib.h>
@ -37,6 +39,7 @@ static int convert_color(int color, char *filename) {
case 0xd0dd8d: c=13; break; /* yellow */
case 0x72ffd0: c=14; break; /* aqua */
case 0xffffff: c=15; break; /* white */
case 0xf5ff00: c=10; break; /* transparent */
default:
fprintf(stderr,"Unknown color %x, file %s\n",
color,filename);
@ -237,9 +240,21 @@ int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
if (bit_depth==8) {
/* top color */
a2_color=row_pointers[y][x];
if (a2_color==16) {
a2_color=10;
}
if (a2_color>16) {
fprintf(stderr,"Error color %d\n",a2_color);
}
/* bottom color */
color=row_pointers[y+(yadd/2)][x];
if (color==16) {
color=10;
}
if (color>16) {
fprintf(stderr,"Error color %d\n",color);
}
a2_color|=(color<<4);