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#include <stdio.h>
#include <SDL2/SDL.h>
SDL_Texture* imv_load_image(SDL_Renderer *r, const char* path);
double clamp(double v, double min, double max) {
if(v < min)
return min;
if(v > max)
return max;
return v;
}
int main(int argc, char** argv)
{
if(argc < 2) {
fprintf(stderr, "Usage: %s <image_file> <...>\n", argv[0]);
exit(1);
}
if(SDL_Init(SDL_INIT_VIDEO) != 0) {
fprintf(stderr, "SDL Failed to Init: %s\n", SDL_GetError());
exit(1);
}
const int width = 1280;
const int height = 720;
SDL_Window *window = SDL_CreateWindow(
"imv",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
width, height,
SDL_WINDOW_RESIZABLE);
SDL_Renderer *renderer =
SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
const char** paths = (const char**)&argv[1];
const int num_paths = argc - 1;
int cur_path = -1;
int next_path = 0;
SDL_Texture *img = NULL;
struct {
double scale;
int x, y;
} view = {1,0,0};
int quit = 0;
int redraw = 1;
while(!quit) {
SDL_Event e;
while(!quit && SDL_PollEvent(&e)) {
switch(e.type) {
case SDL_QUIT:
quit = 1;
break;
case SDL_KEYDOWN:
switch (e.key.keysym.sym) {
case SDLK_q:
quit = 1;
break;
case SDLK_RIGHT:
next_path = (next_path + 1) % num_paths;
break;
case SDLK_LEFT:
next_path -= 1;
if(next_path < 0)
next_path = num_paths - 1;
break;
case SDLK_UP:
view.scale = clamp(view.scale + 0.1, 1, 10);
redraw = 1;
break;
case SDLK_DOWN:
view.scale = clamp(view.scale - 0.1, 1, 10);
redraw = 1;
break;
}
break;
case SDL_MOUSEWHEEL:
view.scale = clamp(view.scale + (0.1 * e.wheel.y), 1, 10);
redraw = 1;
break;
case SDL_MOUSEMOTION:
if(e.motion.state & SDL_BUTTON_LMASK) {
view.x += e.motion.xrel;
view.y += e.motion.yrel;
redraw = 1;
}
break;
case SDL_WINDOWEVENT:
redraw = 1;
break;
}
}
if(quit) {
break;
}
if(next_path != cur_path) {
cur_path = next_path;
fprintf(stdout, "current image: %s\n", paths[cur_path]);
if(img) {
SDL_DestroyTexture(img);
img = NULL;
}
img = imv_load_image(renderer, paths[cur_path]);
view.scale = 1;
view.x = 0;
view.y = 0;
redraw = 1;
}
if(redraw) {
SDL_RenderClear(renderer);
if(img) {
int img_w, img_h, img_access;
unsigned int img_format;
SDL_QueryTexture(img, &img_format, &img_access, &img_w, &img_h);
SDL_Rect view_area = {
view.x,
view.y,
img_w * view.scale,
img_h * view.scale
};
SDL_RenderCopy(renderer, img, NULL, &view_area);
}
SDL_RenderPresent(renderer);
redraw = 0;
}
SDL_Delay(10);
}
if(img) {
SDL_DestroyTexture(img);
img = NULL;
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
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