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Added better error handling

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This commit is contained in:
Ano-sys
2026-08-15 22:33:34 +02:00
parent b5361d8e21
commit b315a55dae
1 changed files with 70 additions and 16 deletions
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SimpleImageViewer.c
+67 -13
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@@ -29,9 +29,19 @@ typedef struct{
int h;
} window_size_delta;
static void error_exit(const char* msg){
printf("%s\n", msg);
exit(-1);
}
static void error_continue(const char* msg){
printf("%s\n", msg);
}
Image load_image_pixels_from_file(const char* filepath){
Image image;
image.pixels = stbi_load(filepath, &image.x, &image.y, &image.channels, DESIRED_IMAGE_CHANNELS);
if(!image.pixels) error_exit("Failed to load image from file!");
return image;
}
@@ -44,7 +54,7 @@ SDL_Window* create_window(const char* title, int w, int h){
const SDL_InitFlags init_flags = SDL_INIT_VIDEO | SDL_INIT_EVENTS;
const SDL_WindowFlags window_flags = SDL_WINDOW_BORDERLESS | SDL_WINDOW_RESIZABLE;
SDL_Init(init_flags);
if(!SDL_Init(init_flags)) error_exit("Failed to initialize SDL!");
/* Used when a larger window is wanted, image displaying is dynamically calculated
int display_count;
@@ -63,14 +73,19 @@ SDL_Window* create_window(const char* title, int w, int h){
*/
SDL_Window* window = SDL_CreateWindow(title, w, h, window_flags);
SDL_SetWindowAspectRatio(window, (float)w / (float)h, (float)w / (float)h);
if(!window) error_exit("Failed to create window!");
if(SDL_SetWindowAspectRatio(window, (float)w / (float)h, (float)w / (float)h)) error_continue("Failed to set window aspect ratio! Continueing...");
return window;
}
void populate_image(SDL_Window* window, Image* image){
bool populate_image(SDL_Window* window, Image* image){
SDL_Surface* surface = SDL_GetWindowSurface(window);
image->surface = SDL_CreateSurface(image->x, image->y, SDL_PIXELFORMAT_RGBA32);
if(!image->surface) {
error_continue("Failed to create image surface! Cleaning up and exiting...");
return false;
}
SDL_Rect pixel = { 0, 0, 1, 1 };
@@ -92,15 +107,26 @@ void populate_image(SDL_Window* window, Image* image){
image->pixels[current_pixel_idx + 2],
image->pixels[current_pixel_idx + 3]);
SDL_FillSurfaceRect(image->surface, &pixel, color);
if(!SDL_FillSurfaceRect(image->surface, &pixel, color)) error_continue("Failed to fill surface rectangle! Trying to continue...");
}
}
image->texture = SDL_CreateTextureFromSurface(SDL_GetRenderer(window), image->surface);
if(!image->texture){
error_continue("Failed to create texture from surface! Cleaning up and exiting...");
SDL_DestroySurface(image->surface);
return false;
};
return true;
}
void draw_image(SDL_Window* window, Image* image, float pixel_size_delta, int image_start_x, int image_start_y){
bool draw_image(SDL_Window* window, Image* image, float pixel_size_delta, int image_start_x, int image_start_y){
SDL_Surface* surface = SDL_GetWindowSurface(window);
if(!surface){
error_continue("Failed to get window surface! Cleaning up and exiting...");
return false;
}
float pixel_size = pixel_size_delta;
@@ -111,12 +137,27 @@ void draw_image(SDL_Window* window, Image* image, float pixel_size_delta, int im
SDL_FRect dst = { center_x - (image->x * pixel_size / 2) + image_start_x, center_y - (image->y * pixel_size / 2) + image_start_y, image->x * pixel_size, image->y * pixel_size };
SDL_Renderer* renderer = SDL_GetRenderer(window);
SDL_RenderClear(renderer);
SDL_RenderTexture(renderer, image->texture, NULL, &dst);
SDL_RenderPresent(renderer);
if(!renderer){
error_continue("Failed to get window renderer! Cleaning up and exiting...");
return false;
}
if(!SDL_RenderClear(renderer)){
error_continue("Failed to clear renderer! Cleaning up and exiting...");
return false;
}
if(!SDL_RenderTexture(renderer, image->texture, NULL, &dst)){
error_continue("Failed to render texture! Cleaning up and exiting...");
return false;
}
if(!SDL_RenderPresent(renderer)){
error_continue("Failed to present renderer! Cleaning up and exiting...");
return false;
}
printf("Redraw time: %.3fms\n", (SDL_GetTicksNS() - start) / 1000000.0);
return true;
}
int clamp(const int in, const int low, const int high){
@@ -198,8 +239,8 @@ void loop(SDL_Window* window, Image* image){
if(event.type == SDL_EVENT_MOUSE_MOTION){
if(drag_left_mouse){
int last_x, last_y;
SDL_GetWindowPosition(window, &last_x, &last_y);
SDL_SetWindowPosition(window, last_x + (int)event.motion.x - last_pointer_x, last_y + (int)event.motion.y - last_pointer_y);
if(!SDL_GetWindowPosition(window, &last_x, &last_y)) error_continue("Failed to get window position!");
else if(!SDL_SetWindowPosition(window, last_x + (int)event.motion.x - last_pointer_x, last_y + (int)event.motion.y - last_pointer_y)) error_continue("Failed to set window position!");
}
if(drag_right_mouse){
int image_start_x = (int)event.motion.x - last_pointer_x + image_start_at_drag_x;
@@ -226,7 +267,7 @@ void loop(SDL_Window* window, Image* image){
if(redraw){
redraw = false;
draw_image(window, image, pixel_size_delta, current_image_start_x, current_image_start_y);
if(!draw_image(window, image, pixel_size_delta, current_image_start_x, current_image_start_y)) error_continue("Failed to draw image! Trying to continue...");
}
}
}
@@ -253,19 +294,32 @@ int main(int argc, char** argv){
SDL_Window* window = create_window("SimpleImageViewer", image.x, image.y);
if(!window){
printf("Failed to create window!");
free_image_pixels_buffer(&image);
exit(4);
}
SDL_Surface* surface = SDL_GetWindowSurface(window);
if(!surface){
printf("Failed to get surface!");
SDL_DestroyWindow(window);
free_image_pixels_buffer(&image);
exit(5);
}
populate_image(window, &image);
if(!populate_image(window, &image)){
printf("Failed to populate image!");
free_image_pixels_buffer(&image);
SDL_DestroyWindow(window);
exit(6);
}
free_image_pixels_buffer(&image);
draw_image(window, &image, 1.0f, 0, 0);
if(!draw_image(window, &image, 1.0f, 0, 0)){
printf("Failed to draw image!");
SDL_DestroyWindow(window);
exit(7);
}
loop(window, &image);