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Add BlitSurfaceTinted()

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This will be used to change the color of existing textures while
preserving their lightness values.
This commit is contained in:
Misa 2020-06-29 15:05:57 -07:00 committed by Ethan Lee
parent ebd381c228
commit 584f73f0a4
2 changed files with 72 additions and 0 deletions
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70
desktop_version/src/GraphicsUtil.cpp
View file

@ -312,6 +312,76 @@ void BlitSurfaceColoured(
SDL_FreeSurface(tempsurface);
}
void BlitSurfaceTinted(
SDL_Surface* _src,
SDL_Rect* _srcRect,
SDL_Surface* _dest,
SDL_Rect* _destRect,
colourTransform& ct
) {
SDL_Rect *tempRect = _destRect;
const SDL_PixelFormat& fmt = *(_src->format);
SDL_Surface* tempsurface = SDL_CreateRGBSurface(
SDL_SWSURFACE,
_src->w,
_src->h,
fmt.BitsPerPixel,
fmt.Rmask,
fmt.Gmask,
fmt.Bmask,
fmt.Amask
);
for (int x = 0; x < tempsurface->w; x++) {
for (int y = 0; y < tempsurface->h; y++) {
Uint32 pixel = ReadPixel(_src, x, y);
Uint8 pixred = (pixel & _src->format->Rmask) >> 16;
Uint8 pixgreen = (pixel & _src->format->Gmask) >> 8;
Uint8 pixblue = (pixel & _src->format->Bmask) >> 0;
double temp_pixred = pixred * 0.299;
double temp_pixgreen = pixgreen * 0.587;
double temp_pixblue = pixblue * 0.114;
double gray = floor((temp_pixred + temp_pixgreen + temp_pixblue + 0.5));
Uint8 ctred = (ct.colour & graphics.backBuffer->format->Rmask) >> 16;
Uint8 ctgreen = (ct.colour & graphics.backBuffer->format->Gmask) >> 8;
Uint8 ctblue = (ct.colour & graphics.backBuffer->format->Bmask) >> 0;
temp_pixred = gray * ctred / 255.0;
temp_pixgreen = gray * ctgreen / 255.0;
temp_pixblue = gray * ctblue / 255.0;
if (temp_pixred > 255)
temp_pixred = 255;
if (temp_pixgreen > 255)
temp_pixgreen = 255;
if (temp_pixblue > 255)
temp_pixblue = 255;
pixred = temp_pixred;
pixgreen = temp_pixgreen;
pixblue = temp_pixblue;
Uint32 Alpha = pixel & fmt.Amask;
Uint32 result = (pixred << 16) + (pixgreen << 8) + (pixblue << 0);
Uint32 CTAlpha = ct.colour & fmt.Amask;
float div1 = ((Alpha >> 24) / 255.0f);
float div2 = ((CTAlpha >> 24) / 255.0f);
Uint32 UseAlpha = (div1 * div2) * 255.0f;
DrawPixel(tempsurface, x, y, result | (UseAlpha << 24));
}
}
SDL_BlitSurface(tempsurface, _srcRect, _dest, tempRect);
SDL_FreeSurface(tempsurface);
}
int scrollamount = 0;
bool isscrolling = 0;

2
desktop_version/src/GraphicsUtil.h
View file

@ -25,6 +25,8 @@ void BlitSurfaceStandard( SDL_Surface* _src, SDL_Rect* _srcRect, SDL_Surface* _d
void BlitSurfaceColoured( SDL_Surface* _src, SDL_Rect* _srcRect, SDL_Surface* _dest, SDL_Rect* _destRect, colourTransform& ct );
void BlitSurfaceTinted( SDL_Surface* _src, SDL_Rect* _srcRect, SDL_Surface* _dest, SDL_Rect* _destRect, colourTransform& ct );
void FillRect( SDL_Surface* surface, const int x, const int y, const int w, const int h, const int r, int g, int b );
void FillRect( SDL_Surface* surface, const int r, int g, int b );