How to resize Window to loaded Image? - c

Question

Is there a way that to resize the window in SDL to fit the loaded image size? currently when you resize it copies what was behind the window.
This is my Load Image Function:
void userImage(SDL_Surface *surface, SDL_Window *window)
{
SDL_Surface *userLoadImage;
char FileLocation[200];
printf( "Please Enter the file location:\n" );
fgets(FileLocation, 200, stdin );
fflush(stdin);
FileLocation[strcspn(FileLocation,"\n")]=0;
char *const picturePath = FileLocation;
userLoadImage = IMG_Load( picturePath );
int width = userLoadImage->w; //Get the width
int height = userLoadImage ->h; //Get the height
printf("image width = %d\n", width);
printf("image width = %d\n", height);
SDL_BlitSurface(userLoadImage, NULL, surface, NULL);
SDL_SetWindowSize( window, width, height);
}

Answer 1

This is the way I fixed it: All i changed was to reassign the window to the surface 'surface = SDL_GetWindowSurface(window);'
void userImage(SDL_Surface *surface, SDL_Window *window)
{
SDL_Surface *userLoadImage;
char FileLocation[200];
printf( "Please Enter the file location:\n" );
fgets(FileLocation, 200, stdin );
fflush(stdin);
FileLocation[strcspn(FileLocation,"\n")]=0;
char *const picturePath = FileLocation;
userLoadImage = IMG_Load( picturePath );
int width = userLoadImage->w; //Get the width
int height = userLoadImage ->h; //Get the height
SDL_SetWindowSize( window, width, height);
surface = SDL_GetWindowSurface(window);
SDL_BlitSurface(userLoadImage, NULL, surface, NULL);
}

Answer 2

Here is an SDL method for scaling a surface that may do what you are looking for:
SDL_Surface* SDL_ScaleSurface(SDL_Surface *Surface, Uint16 Width, Uint16 Height)
{
for(Sint32 y = 0; y < Surface->h; y++) //Run across all Y pixels.
for(Sint32 x = 0; x < Surface->w; x++) //Run across all X pixels.
for(Sint32 o_y = 0; o_y < _stretch_factor_y; ++o_y) //Draw _stretch_factor_y pixels for each Y pixel.
for(Sint32 o_x = 0; o_x < _stretch_factor_x; ++o_x) //Draw _stretch_factor_x pixels for each X pixel.
DrawPixel(_ret, static_cast<Sint32>(_stretch_factor_x * x) + o_x,
static_cast<Sint32>(_stretch_factor_y * y) + o_y, ReadPixel(Surface, x, y));
}
The example, and much more is on this page.