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add shrinking for shadows

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This commit is contained in:
Tim Felgentreff 2022-04-26 21:27:26 +02:00
parent 148fc8a037
commit 84606ed541
1 changed files with 33 additions and 8 deletions

41
src/video/graphic.cpp
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@ -1165,23 +1165,48 @@ void CGraphic::MakeShadow(int xOffset, int yOffset)
Surface = alphaSurface;
if (SurfaceFlip) {
VideoPaletteListRemove(SurfaceFlip);
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);
alphaSurface = SDL_CreateRGBSurface(0, SurfaceFlip->w, SurfaceFlip->h, 32, RMASK, GMASK, BMASK, AMASK);
SDL_BlitSurface(SurfaceFlip, NULL, alphaSurface, NULL);
SDL_SetSurfaceAlphaMod(alphaSurface, 80);
SDL_SetSurfaceColorMod(alphaSurface, 0, 0, 0);
SDL_FreeSurface(SurfaceFlip);
SurfaceFlip = alphaSurfaceFlip;
SurfaceFlip = alphaSurface;
}
// Apply shearing effect. same angle for Surface and SurfaceFlip!
// The sun shines from the same angle on to both normal and flipped sprites :)
// BEGIN HACK: XXX: FIXME: positive yOffset is used for fliers for now, these should not get shearing.
// We need to find a better way to communicate that. The rest of the code already supports shearing
// in both directions for y.
yOffset = std::min(0, yOffset);
// END HACK
// Apply shearing effect. same angle for Surface and SurfaceFlip!
// The sun shines from the same angle on to both normal and flipped sprites :)
// 1. Shrink each frame in y-direction based on the x offset
alphaSurface = SDL_CreateRGBSurface(0, Surface->w, Surface->h, 32, RMASK, GMASK, BMASK, AMASK);
for (int f = 0; f < NumFrames; f++) {
int frameX = frame_map[f].x;
int frameY = frame_map[f].y;
const SDL_Rect srcRect = { frameX, frameY, Width, Height };
SDL_Rect dstRect = { frameX, frameY + std::abs(xOffset) / 2, Width, Height - (std::abs(xOffset) - std::abs(xOffset) / 2) };
SDL_BlitScaled(Surface, &srcRect, alphaSurface, &dstRect);
}
SDL_FreeSurface(Surface);
Surface = alphaSurface;
if (SurfaceFlip) {
alphaSurface = SDL_CreateRGBSurface(0, SurfaceFlip->w, SurfaceFlip->h, 32, RMASK, GMASK, BMASK, AMASK);
for (int f = 0; f < NumFrames; f++) {
int frameX = frameFlip_map[f].x;
int frameY = frameFlip_map[f].y;
const SDL_Rect srcRect = { frameX, frameY, Width, Height };
SDL_Rect dstRect = { frameX, frameY + std::abs(xOffset) / 2, Width, Height - (std::abs(xOffset) - std::abs(xOffset) / 2) };
SDL_BlitScaled(SurfaceFlip, &srcRect, alphaSurface, &dstRect);
}
SDL_FreeSurface(SurfaceFlip);
SurfaceFlip = alphaSurface;
}
// 2. Apply shearing
if (yOffset || xOffset) {
SDL_LockSurface(Surface);
uint32_t* pixels = (uint32_t *)Surface->pixels;