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Surface: Work around bug in SDL that loses per-surface alpha.

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A bug in SDL_ConvertSurface() leaves the per-surface alpha undefined when
converting from RGBA to RGBA. This can cause problems if the surface is
later converted to a format without an alpha channel, such as the display
format.
This commit is contained in:
Maarten ter Huurne 2011-06-05 05:27:28 +02:00
parent 36260e999d
commit 2394a075d7
1 changed files with 5 additions and 0 deletions
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5
src/surface.cpp
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@ -81,6 +81,11 @@ Surface::Surface(SDL_Surface *raw_, bool freeWhenDone_)
Surface::Surface(Surface *s) {
raw = SDL_ConvertSurface(s->raw, s->raw->format, SDL_SWSURFACE);
// Note: A bug in SDL_ConvertSurface() leaves the per-surface alpha
// undefined when converting from RGBA to RGBA. This can cause
// problems if the surface is later converted to a format without
// an alpha channel, such as the display format.
raw->format->alpha = s->raw->format->alpha;
freeWhenDone = true;
halfW = raw->w/2;
halfH = raw->h/2;