I'm using the sdl library, but it dosent support scale / resize surface, so i downloaded the
SDL_image 1.2 & SDL_gfx Library. My function/code works, but the image appear in bad / low
quality.
Let say i got a image which is 100X100, if i scale down to 95X95 or scale up to 110X110 the
quality appear very low, but if i leave it at 100X100 which is the same size it appear in
good quality. Images most appear in good quality, if scaled down, but ... it dosent
my code is:
int drawImage(SDL_Surface* display, const char * filename, int x, int y, int xx, int yy , const double newwidth, const double newheight, int transparent = NULL)
{
SDL_Surface *image;
SDL_Surface *temp;
temp = IMG_Load(filename); if (temp == NULL) { printf("Unable to load image: %s\n", SDL_GetError()); return 1; }
image = SDL_DisplayFormat(temp); SDL_FreeSurface(temp);
// Zoom function uses doubles for rates of scaling, rather than
// exact size values. This is how we get around that:
double zoomx = newwidth / (float)image->w;
double zoomy = newheight / (float)image->h;
// This function assumes no smoothing, so that any colorkeys wont bleed.
SDL_Surface* sized = zoomSurface( image, zoomx, zoomy, SMOOTHING_OFF );
// If the original had an alpha color key, give it to the new one.
if( image->flags & SDL_SRCCOLORKEY )
{
// Acquire the original Key
Uint32 colorkey = image->format->colorkey;
// Set to the new image
SDL_SetColorKey( sized, SDL_SRCCOLORKEY, colorkey );
}
// The original picture is no longer needed.
SDL_FreeSurface( image );
// Set it instead to the new image.
image = sized;
SDL_Rect src, dest;
src.x = xx; src.y = yy; src.w = image->w; src.h = image->h; // size
dest.x = x; dest.y = y; dest.w = image->w; dest.h = image->h;
if(transparent == true )
{
//Set the color as transparent
SDL_SetColorKey(image,SDL_SRCCOLORKEY|SDL_RLEACCEL,SDL_MapRGB(image->format,0x0,0x0,0x0));
}
else {
}
SDL_BlitSurface(image, &src, display, &dest);
return true;
}
drawImage(display, "Image.png", 50, 100, NULL, NULL, 100, 100,true);
