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Support 1-bit alpha on surfaces passed to SDL_WM_SetIcon() (thanks Glenn!)

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40542
This commit is contained in:
Sam Lantinga 2002-11-17 17:55:45 +00:00
parent bb1c6662b5
commit 4135293105
1 changed files with 16 additions and 6 deletions
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22
src/video/SDL_video.c
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@ -1640,8 +1640,9 @@ void SDL_WM_GetCaption (char **title, char **icon)
}
}
/* Utility function used by SDL_WM_SetIcon() */
static void CreateMaskFromColorKey(SDL_Surface *icon, Uint8 *mask)
/* Utility function used by SDL_WM_SetIcon();
* flags & 1 for color key, flags & 2 for alpha channel. */
static void CreateMaskFromColorKeyOrAlpha(SDL_Surface *icon, Uint8 *mask, int flags)
{
int x, y;
Uint32 colorkey;
@ -1667,9 +1668,12 @@ static void CreateMaskFromColorKey(SDL_Surface *icon, Uint8 *mask)
pixels = (Uint16 *)icon->pixels +
y*icon->pitch/2;
for ( x=0; x<icon->w; ++x ) {
if ( *pixels++ == colorkey ) {
if ( (flags & 1) && *pixels == colorkey ) {
SET_MASKBIT(icon, x, y, mask);
} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
SET_MASKBIT(icon, x, y, mask);
}
pixels++;
}
}
}
@ -1680,9 +1684,12 @@ static void CreateMaskFromColorKey(SDL_Surface *icon, Uint8 *mask)
pixels = (Uint32 *)icon->pixels +
y*icon->pitch/4;
for ( x=0; x<icon->w; ++x ) {
if ( *pixels++ == colorkey ) {
if ( (flags & 1) && *pixels == colorkey ) {
SET_MASKBIT(icon, x, y, mask);
} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
SET_MASKBIT(icon, x, y, mask);
}
pixels++;
}
}
}
@ -1702,13 +1709,16 @@ void SDL_WM_SetIcon (SDL_Surface *icon, Uint8 *mask)
/* Generate a mask if necessary, and create the icon! */
if ( mask == NULL ) {
int mask_len = icon->h*(icon->w+7)/8;
int flags = 0;
mask = (Uint8 *)malloc(mask_len);
if ( mask == NULL ) {
return;
}
memset(mask, ~0, mask_len);
if ( icon->flags & SDL_SRCCOLORKEY ) {
CreateMaskFromColorKey(icon, mask);
if ( icon->flags & SDL_SRCCOLORKEY ) flags |= 1;
if ( icon->flags & SDL_SRCALPHA ) flags |= 2;
if( flags ) {
CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
}
video->SetIcon(video, icon, mask);
free(mask);