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use 32-bit alpha for fancy shadows

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This commit is contained in:
Tim Felgentreff 2022-04-10 07:40:32 +02:00
parent 2927109feb
commit 72d87848d3
1 changed files with 12 additions and 8 deletions

20
src/video/graphic.cpp
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@ -1063,16 +1063,20 @@ static inline void dither(SDL_Surface *Surface) {
void CGraphic::MakeShadow()
{
if (Surface->format->BytesPerPixel == 1) {
SDL_Color colors[256];
// Set all colors in the palette to black and use dithering for alpha
memset(colors, 0, sizeof(colors));
SDL_SetPaletteColors(Surface->format->palette, colors, 0, 256);
dither(Surface);
SDL_Surface *alphaSurface = SDL_CreateRGBSurface(0, Surface->w, Surface->h, 32, RMASK, GMASK, BMASK, AMASK);
SDL_BlitSurface(Surface, NULL, alphaSurface, NULL);
SDL_SetSurfaceAlphaMod(alphaSurface, 80);
SDL_SetSurfaceColorMod(alphaSurface, 0, 0, 0);
SDL_FreeSurface(Surface);
Surface = alphaSurface;
if (SurfaceFlip) {
SDL_SetPaletteColors(SurfaceFlip->format->palette, colors, 0, 256);
dither(Surface);
SDL_Surface *alphaSurfaceFlip = SDL_CreateRGBSurface(0, SurfaceFlip->w, SurfaceFlip->h, 32, RMASK, GMASK, BMASK, AMASK);
SDL_BlitSurface(SurfaceFlip, NULL, alphaSurfaceFlip, NULL);
SDL_SetSurfaceAlphaMod(alphaSurfaceFlip, 80);
SDL_SetSurfaceColorMod(alphaSurfaceFlip, 0, 0, 0);
SDL_FreeSurface(SurfaceFlip);
SurfaceFlip = alphaSurfaceFlip;
}
}
}