Improve palette handling in STB backend

ankith26 · slouken · commit 071d724151ef · 2025-08-28T04:28:49.000-07:00
diff --git a/src/IMG_stb.c b/src/IMG_stb.c
@@ -191,6 +191,8 @@ SDL_Surface *IMG_LoadSTB_RW(SDL_RWops *src)
                 SDL_FreeSurface(surface);
                 surface = converted;
             } else if (has_colorkey) {
+                /* remove redundant pixel alpha before setting colorkey */
+                palette->colors[colorkey_index].a = SDL_ALPHA_OPAQUE;
                 SDL_SetColorKey(surface, SDL_TRUE, colorkey_index);
             }
         }

Original file line number	Diff line number	Diff line change
`@@ -191,6 +191,8 @@ SDL_Surface IMG_LoadSTB_RW(SDL_RWops src)`
`191`	`191`	`SDL_FreeSurface(surface);`
`192`	`192`	`surface = converted;`
`193`	`193`	`} else if (has_colorkey) {`
	`194`	`+ /* remove redundant pixel alpha before setting colorkey */`
	`195`	`+ palette->colors[colorkey_index].a = SDL_ALPHA_OPAQUE;`
`194`	`196`	`SDL_SetColorKey(surface, SDL_TRUE, colorkey_index);`
`195`	`197`	`}`
`196`	`198`	`}`