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Make scaleSourceToDestinationSurface() idempotent

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Deviation between scaling done during window sizing and renderer
viewport configuration can lead to small errors that create visible
artifacts such as a single pixel pillarbox/letterbox on one side.
This commit is contained in:
Cameron Gutman
2022-10-15 13:12:18 -05:00
parent a860bd8dd5
commit 6771877a84
1 changed files with 2 additions and 4 deletions
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app/streaming/streamutils.cpp
+2 -4
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@@ -17,18 +17,16 @@ Uint32 StreamUtils::getPlatformWindowFlags()
void StreamUtils::scaleSourceToDestinationSurface(SDL_Rect* src, SDL_Rect* dst) void StreamUtils::scaleSourceToDestinationSurface(SDL_Rect* src, SDL_Rect* dst)
{ {
int dstH = dst->w * src->h / src->w; int dstH = SDL_ceilf((float)dst->w * src->h / src->w);
int dstW = dst->h * src->w / src->h; int dstW = SDL_ceilf((float)dst->h * src->w / src->h);
if (dstH > dst->h) { if (dstH > dst->h) {
dst->x += (dst->w - dstW) / 2; dst->x += (dst->w - dstW) / 2;
dst->w = dstW; dst->w = dstW;
SDL_assert(dst->w * src->h / src->w <= dst->h);
} }
else { else {
dst->y += (dst->h - dstH) / 2; dst->y += (dst->h - dstH) / 2;
dst->h = dstH; dst->h = dstH;
SDL_assert(dst->h * src->w / src->h <= dst->w);
} }
} }