Segmentation fault in c

I am trying to convert an image to grayscale using SDL and c. When compiling in compiler it doesn’t give me any errors. However, if I try to build the code in the terminal, I get - segmentation fault (core dumped)? I am quite new to C and haven’t managed to find a mistake in my code. Any suggestions would be greatly appreciated.

[code]int main(int argc, char* argv[])

//Declaring pointers
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Event event;
SDL_Texture *texture;
int i, quit;
Uint32 *pixels;

/* Check command line usage */
if ( ! argv[1] ) {
fprintf(stderr, "Give an image file: %s
", argv[0]);
}

//Initializing window and renderer
SDL_Init(SDL_INIT_VIDEO);

//Creating a window
if (SDL_CreateWindowAndRenderer(640, 480, SDL_WINDOW_RESIZABLE, &window, &renderer))
{
printf("Couldn’t open the window: %s
", SDL_GetError());
}

//Option to display in fullscreen
//Taken from Compting fro Graphics lesson, imagine.c file
for ( i=1; argv[i]; i++) {
if ( strcmp(argv[i], “-fullscreen”) == 0 ) {
continue;
}
}
//Code from imagine.c ends

//Load an image
SDL_Surface * image = IMG_Load(argv[i]);
if (!image)
{
fprintf(stderr, "Couldn’t load the image %s: %s
", argv[i], SDL_GetError());
}

//Create texture from image
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, image->w, image->h);
if (!texture)
{
printf("Couldn’t create texture from image: %s
", SDL_GetError());
}

//Convert surface to ARGB8888 format
image = SDL_ConvertSurfaceFormat(image, SDL_PIXELFORMAT_ARGB8888, 0);

//Surface pixels from void to *Uint32
pixels = (Uint32 *)image->pixels;

quit = 0;
while (!quit) {
SDL_UpdateTexture(texture, NULL, image->pixels, image->w *sizeof(Uint32));
SDL_WaitEvent(&event); {
switch (event.type) {
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {

            //Going through y axis
            for (int y = 0; y < image->h; y++)
            {
                //Going through x axis
                for (int x = 0; x < image->w; x++)
                {
                    //Converting to grayscale
                    Uint32 pixel = pixels[y * image->w + x];

                    Uint8 r = pixel >> 16 & 0xFF;
                    Uint8 g = pixel >> 8 & 0xFF;
                    Uint8 b = pixel & 0xFF;

                    Uint8 v = 0.212671f * r + 0.715160f * g + 0.072169f * b;

                    pixel = (0xFF << 24) | (v << 16) | (v << 8) | v;
                    pixels[y * image->w +x] = pixel;
                }
                case SDLK_LEFT:
                if ( i > 1 ) {
                    i -= 2;
                    quit = 1;
                    }
                    break;
                    case SDLK_RIGHT:
                    if ( argv[i+1] ) {
                        quit = 1;
                    }
                    break;
                    case SDLK_ESCAPE:
                    case SDLK_q:
                        argv[i+1] = NULL;
                    /* Drop through to done */
                    case SDLK_SPACE:
                    case SDLK_TAB:
                    quit = 1;
                    break;
                    default:
                    break;
                }
                break;
                case SDL_MOUSEBUTTONDOWN:
                quit = 1;
                break;
                case SDL_QUIT:
                argv[i+1] = NULL;
                quit = 1;
                break;
                break;
        }
    }
    //Show the image
    SDL_RenderCopy(renderer, texture, NULL, NULL);
    SDL_RenderPresent(renderer);
}
SDL_DestroyTexture(texture);
SDL_FreeSurface(image);

}
//Quit SDL
SDL_Quit();
return (0);[/code]

you should ask this on a C oriented forum

or here https://discourse.libsdl.org/ … the forum for the library you’re using :slight_smile:

There seems to be a sudden rash of questions for non Xojo related languages… Is some other forum sending people here as a joke or something? Not that there are not people here that COULD answer these queries, but they are way off topic for this forum

A side effect to the Xojo massive advertising campaign I can see everywhere I go ?

It was posted under “Off Topic” after all :slight_smile:

notice how all the “off topic” postings requesting help for non-Xojo langauges result in a one time post, and the “user” then vanishes? They probably post somewhere else about how “unhelpful” this site was … :smiley:

Anybody spaced enough to ask questions about C in a Xojo forum is off to strange start anyway …