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Ax ScaleSurfaceSlow() in favor of ScaleSurface()

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ScaleSurfaceSlow() uses DrawPixel() instead of SDL_FillRect() to scale a
given surface, which is slow and inefficient, and makes it less likely
that the game could be moved to SDL_Render.

Unfortunately, it has this weird -1,-1 offset, but that will be fixed in
the next commit.
This commit is contained in:
Misa
2020-08-04 13:09:13 -07:00
committed by Ethan Lee
parent 57dca99a4e
commit 5f776faba7
3 changed files with 2 additions and 35 deletions
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32
desktop_version/src/GraphicsUtil.cpp
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@@ -171,38 +171,6 @@ SDL_Surface * ScaleSurface( SDL_Surface *_surface, int Width, int Height, SDL_Su
return _ret;
}
SDL_Surface * ScaleSurfaceSlow( SDL_Surface *_surface, int Width, int Height)
{
if(!_surface || !Width || !Height)
return 0;
SDL_Surface *_ret;
_ret = SDL_CreateRGBSurface(_surface->flags, Width, Height, _surface->format->BitsPerPixel,
_surface->format->Rmask, _surface->format->Gmask, _surface->format->Bmask, _surface->format->Amask);
if(_ret == NULL)
{
return NULL;
}
float _stretch_factor_x = (static_cast<double>(Width) / static_cast<double>(_surface->w)), _stretch_factor_y = (static_cast<double>(Height) / static_cast<double>(_surface->h));
for(Sint32 y = 0; y < _surface->h; y++)
for(Sint32 x = 0; x < _surface->w; x++)
for(Sint32 o_y = 0; o_y < _stretch_factor_y; ++o_y)
for(Sint32 o_x = 0; o_x < _stretch_factor_x; ++o_x)
DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
// DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
//static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(_surface, x, y));
return _ret;
}
SDL_Surface * FlipSurfaceHorizontal(SDL_Surface* _src)
{
SDL_Surface * ret = SDL_CreateRGBSurface(_src->flags, _src->w, _src->h, _src->format->BitsPerPixel,