mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
synced 2026-09-29 18:28:19 +03:00
43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
// srcのsurfaceの一部をdstに飽和加算
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "portab.h"
|
|
#include "system.h"
|
|
#include "surface.h"
|
|
#include "ngraph.h"
|
|
#include "ags.h"
|
|
|
|
void gr_blend_screen(surface_t *dst, int dx, int dy, surface_t *src, int sx, int sy, int width, int height) {
|
|
if (!gr_clip(src, &sx, &sy, &width, &height, dst, &dx, &dy)) return;
|
|
|
|
uint8_t *sp = GETOFFSET_PIXEL(src, sx, sy);
|
|
uint8_t *dp = GETOFFSET_PIXEL(dst, dx, dy);
|
|
|
|
switch(dst->depth) {
|
|
case 16:
|
|
for (int y = 0; y < height; y++) {
|
|
uint16_t *yls = (uint16_t *)(sp + y * src->bytes_per_line);
|
|
uint16_t *yld = (uint16_t *)(dp + y * dst->bytes_per_line);
|
|
for (int x = 0; x < width; x++) {
|
|
*yld = SUTURADD16(*yls, *yld);
|
|
yls++; yld++;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 32:
|
|
case 24:
|
|
for (int y = 0; y < height; y++) {
|
|
uint32_t *yls = (uint32_t *)(sp + y * src->bytes_per_line);
|
|
uint32_t *yld = (uint32_t *)(dp + y * dst->bytes_per_line);
|
|
for (int x = 0; x < width; x++) {
|
|
*yld = SUTURADD24(*yls, *yld);
|
|
yls++; yld++;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|