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pixels fix

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This commit is contained in:
p.kosyh 2011-04-28 14:21:08 +00:00
parent 70ce0b0b7e
commit e714eea84b
1 changed files with 13 additions and 3 deletions
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16
src/sdl-instead/graphics.c
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@ -604,7 +604,9 @@ int gfx_get_pixel(img_t src, int x, int y, color_t *color)
bpp = 1; /* hack? */
ptr = (Uint8*)img->pixels;
ptr += (y * img->w + x) * bpp;
ptr += img->pitch * y;
ptr += x * bpp;
memcpy(&col, ptr, bpp);
SDL_UnlockSurface(img);
@ -641,7 +643,8 @@ int gfx_set_pixel(img_t src, int x, int y, color_t color)
bpp = 1; /* hack? */
ptr = (Uint8*)img->pixels;
ptr += (y * img->w + x) * bpp;
ptr += img->pitch * y;
ptr += x * bpp;
col = SDL_MapRGBA(img->format, color.r, color.g, color.b, color.a);
memcpy(ptr, &col, bpp);
@ -672,8 +675,9 @@ img_t gfx_alpha_img(img_t src, int alpha)
SDL_SetAlpha(img, SDL_SRCALPHA, SDL_ALPHA_OPAQUE);
if (SDL_LockSurface(img) == 0) {
int w = img->w;
ptr = (Uint8*)img->pixels;
size = img->w * img->h;
size = img->w * img->h;
while (size --) {
Uint8 r, g, b, a;
memcpy(&col, ptr, bpp);
@ -681,6 +685,12 @@ img_t gfx_alpha_img(img_t src, int alpha)
col = SDL_MapRGBA(img->format, r, g, b, a * alpha / 255);
memcpy(ptr, &col, bpp);
ptr += bpp;
w --;
if (!w) {
w = img->w;
ptr += img->pitch;
ptr -= w * bpp;
}
}
SDL_UnlockSurface(img);
}