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#include <stdio.h>
#include <SDL2/SDL.h>
SDL_Texture* imv_load_image(SDL_Renderer *r, const char* path);
struct {
double scale;
int x, y;
int redraw;
} g_view = {1,0,0,1};
void reset_view()
{
g_view.scale = 1;
g_view.x = 0;
g_view.y = 0;
g_view.redraw = 1;
}
void move_view(int x, int y)
{
g_view.x += x;
g_view.y += y;
g_view.redraw = 1;
}
void zoom_view(int amount)
{
g_view.scale += amount * 0.1;
if(g_view.scale > 10)
g_view.scale = 10;
else if (g_view.scale < 1)
g_view.scale = 1;
g_view.redraw = 1;
}
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;
int quit = 0;
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:
zoom_view(1);
break;
case SDLK_DOWN:
zoom_view(-1);
break;
}
break;
case SDL_MOUSEWHEEL:
zoom_view(e.wheel.y);
break;
case SDL_MOUSEMOTION:
if(e.motion.state & SDL_BUTTON_LMASK) {
move_view(e.motion.xrel, e.motion.yrel);
}
break;
case SDL_WINDOWEVENT:
g_view.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]);
reset_view();
}
if(g_view.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 g_view_area = {
g_view.x,
g_view.y,
img_w * g_view.scale,
img_h * g_view.scale
};
SDL_RenderCopy(renderer, img, NULL, &g_view_area);
}
SDL_RenderPresent(renderer);
g_view.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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