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fix in pixel logic

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This commit is contained in:
p.kosyh 2011-04-28 12:17:10 +00:00
parent 4e1e162bca
commit d1a21ba58e
1 changed files with 39 additions and 15 deletions
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54
src/sdl-instead/graphics.c
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@ -585,8 +585,9 @@ img_t gfx_display_alpha(img_t src)
int gfx_get_pixel(img_t src, int x, int y, color_t *color)
{
Uint8 r, g, b, a;
Uint32 col;
Uint32 *ptr;
Uint32 col = 0;
Uint8 *ptr;
int bpp;
SDL_Surface *img = Surf(src);
if (!img)
return -1;
@ -596,9 +597,16 @@ int gfx_get_pixel(img_t src, int x, int y, color_t *color)
if (SDL_LockSurface(img))
return -1;
ptr = (Uint32*)img->pixels;
ptr += y * img->w + x;
col = *ptr;
if (img->format)
bpp = img->format->BytesPerPixel;
else
bpp = 1; /* hack? */
ptr = (Uint8*)img->pixels;
ptr += (y * img->w + x) * bpp;
memcpy(&col, ptr, bpp);
SDL_UnlockSurface(img);
if (color)
SDL_GetRGBA(col, img->format, &r, &g, &b, &a);
@ -614,8 +622,9 @@ int gfx_get_pixel(img_t src, int x, int y, color_t *color)
int gfx_set_pixel(img_t src, int x, int y, color_t color)
{
int bpp;
Uint32 col;
Uint32 *ptr;
Uint8 *ptr;
SDL_Surface *img = Surf(src);
if (!img)
return -1;
@ -625,20 +634,28 @@ int gfx_set_pixel(img_t src, int x, int y, color_t color)
if (SDL_LockSurface(img))
return -1;
ptr = (Uint32*)img->pixels;
ptr += y * img->w + x;
if (img->format)
bpp = img->format->BytesPerPixel;
else
bpp = 1; /* hack? */
ptr = (Uint8*)img->pixels;
ptr += (y * img->w + x) * bpp;
col = SDL_MapRGBA(img->format, color.r, color.g, color.b, color.a);
*ptr = col;
memcpy(ptr, &col, bpp);
SDL_UnlockSurface(img);
return 0;
}
img_t gfx_alpha_img(img_t src, int alpha)
{
Uint32 *ptr;
Uint8 *ptr;
Uint32 col;
int size;
int bpp;
SDL_Surface *img;
if (screen)
img = SDL_DisplayFormatAlpha((SDL_Surface*)src);
@ -646,17 +663,24 @@ img_t gfx_alpha_img(img_t src, int alpha)
img = gfx_new(Surf(src)->w, Surf(src)->h);
if (!img)
return NULL;
if (img->format)
bpp = img->format->BytesPerPixel;
else
bpp = 1;
SDL_SetAlpha(img, SDL_SRCALPHA, SDL_ALPHA_OPAQUE);
if (SDL_LockSurface(img) == 0) {
ptr = (Uint32*)img->pixels;
ptr = (Uint8*)img->pixels;
size = img->w * img->h;
while (size --) {
Uint8 r, g, b, a;
col = *ptr;
memcpy(&col, ptr, bpp);
SDL_GetRGBA(col, img->format, &r, &g, &b, &a);
col = SDL_MapRGBA(img->format, r, g, b, a * alpha / 255);
*ptr = col;
ptr ++;
memcpy(ptr, &col, bpp);
ptr += bpp;
}
SDL_UnlockSurface(img);
}