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reworked screen update emulation to support ranges

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This commit is contained in:
HW
2011-12-08 23:43:37 +01:00
parent ac010ea325
commit 41aa17082b
1 changed files with 18 additions and 15 deletions
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33
einkfb.c
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@@ -153,23 +153,26 @@ static int einkUpdate(lua_State *L) {
if(SDL_MUSTLOCK(fb->screen) && (SDL_LockSurface(fb->screen) < 0)) {
return luaL_error(L, "can't lock surface.");
}
uint32_t *sfptr = (uint32_t*)fb->screen->pixels;
uint8_t *fbptr = (uint8_t*)fb->buf->data;
int x1 = luaL_optint(L, 3, 0);
int y1 = luaL_optint(L, 4, 0);
int w = luaL_optint(L, 5, fb->vinfo.xres);
int h = luaL_optint(L, 6, fb->vinfo.yres);
int c = fb->finfo.smem_len;
int x, y;
while(c--) {
*sfptr = SDL_MapRGB(fb->screen->format,
255 - (*fbptr & 0xF0),
255 - (*fbptr & 0xF0),
255 - (*fbptr & 0xF0));
sfptr++;
*sfptr = SDL_MapRGB(fb->screen->format,
255 - ((*fbptr & 0x0F) << 4),
255 - ((*fbptr & 0x0F) << 4),
255 - ((*fbptr & 0x0F) << 4));
sfptr++;
fbptr++;
for(y = y1; y < y1+h; y++) {
uint32_t *sfptr = (uint32_t*)(fb->screen->pixels + y*fb->screen->pitch);
for(x = x1; x < x1+w; x+=2) {
uint8_t value = fb->buf->data[y*fb->buf->pitch + x/2];
sfptr[x] = SDL_MapRGB(fb->screen->format,
255 - (value & 0xF0),
255 - (value & 0xF0),
255 - (value & 0xF0));
sfptr[x+1] = SDL_MapRGB(fb->screen->format,
255 - ((value & 0x0F) << 4),
255 - ((value & 0x0F) << 4),
255 - ((value & 0x0F) << 4));
}
}
if(SDL_MUSTLOCK(fb->screen)) SDL_UnlockSurface(fb->screen);
SDL_Flip(fb->screen);