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Fixed bug with converting colorkey surface to texture

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403246
This commit is contained in:
Sam Lantinga 2008-11-25 02:12:19 +00:00
parent f341bd32dd
commit de690ebe5d
2 changed files with 70 additions and 0 deletions
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66
src/video/SDL_surface.c
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@ -269,6 +269,72 @@ SDL_SetColorKey(SDL_Surface * surface, Uint32 flag, Uint32 key)
return 0;
}
/* This is a fairly slow function to switch from colorkey to alpha */
void
SDL_ConvertColorkeyToAlpha(SDL_Surface *surface)
{
int x, y;
if (!surface) {
return;
}
if (!(surface->map->info.flags & SDL_COPY_COLORKEY) ||
!surface->format->Amask) {
return;
}
SDL_LockSurface(surface);
switch (surface->format->BytesPerPixel) {
case 2:
{
Uint16 *row, *spot;
Uint16 ckey = (Uint16)surface->map->info.colorkey;
Uint16 mask = (Uint16)(~surface->format->Amask);
row = (Uint16 *)surface->pixels;
for (y = surface->h; y--; ) {
spot = row;
for (x = surface->w; x--; ) {
if (*spot == ckey) {
*spot &= mask;
}
++spot;
}
row += surface->pitch / 2;
}
}
break;
case 3:
/* FIXME */
break;
case 4:
{
Uint32 *row, *spot;
Uint32 ckey = surface->map->info.colorkey;
Uint32 mask = ~surface->format->Amask;
row = (Uint32 *)surface->pixels;
for (y = surface->h; y--; ) {
spot = row;
for (x = surface->w; x--; ) {
if (*spot == ckey) {
*spot &= mask;
}
++spot;
}
row += surface->pitch / 4;
}
}
break;
}
SDL_UnlockSurface(surface);
SDL_SetColorKey(surface, 0, 0);
}
int
SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
{