initial commit

README.md

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+# Simple image viewer for `.ppm` types of images
+
+[Source code](iv.c)
+
+## Build with
+
+```bash
+gcc -Wall -Wextra -g -o iv iv.c `sdl2-config --cflags --libs`
+```
+
+## Run with 
+
+```
+cat image.ppm | ./iv
+```
+
+### Dependencies
+
+* `sdl2`

iv.c

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+#include <SDL2/SDL_events.h>
+#include <SDL2/SDL_pixels.h>
+#include <SDL2/SDL_rect.h>
+#include <SDL2/SDL_stdinc.h>
+#include <SDL2/SDL_surface.h>
+#include <SDL2/SDL_timer.h>
+#include <SDL2/SDL_video.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <SDL2/SDL.h>
+
+int main()
+{
+  FILE *in = stdin;
+  char *pthroway = calloc(1000, sizeof(char));
+  // read first line (specifier P3 or P6 - ignore here)
+  fgets(pthroway, 1000, in);
+  // read second line (comment)
+  fgets(pthroway, 1000, in);
+  // read third line (dimensions: width / height)
+  char *pdimensions = calloc(1000, sizeof(char));
+  fgets(pdimensions, 1000, in);
+  free(pthroway);
+
+  int width = -1;
+  int height = -1;
+  sscanf(pdimensions, "%d %d\n", &width, &height);
+  free(pdimensions);
+
+  printf("width=%d, height=%d\n", width, height);
+
+  SDL_Window * pwindow = SDL_CreateWindow("Image Viewer", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, 0);
+  SDL_Surface *psurface = SDL_GetWindowSurface(pwindow);
+
+
+  SDL_Rect pixel = (SDL_Rect){0, 0, 1, 1};
+  Uint32 color = 0;
+  for (int y = 0; y < height; y++) {
+    for (int x = 0; x < width; x++) {
+      Uint8 r, g, b;
+      r = (char) getchar();
+      g = (char) getchar();
+      b = (char) getchar();
+      color = SDL_MapRGB(psurface->format, r, g, b);
+      pixel.x = x;
+      pixel.y = y;
+      SDL_FillRect(psurface, &pixel, color);
+    }
+  }
+  SDL_UpdateWindowSurface(pwindow);
+
+  int app_running = 1;
+  while (app_running) {
+    SDL_Event event;
+    while (SDL_PollEvent(&event)) {
+      if (event.type == SDL_QUIT) {
+        app_running = 0;
+      }
+    }
+    SDL_Delay(100);
+  }
+
+  return EXIT_SUCCESS;
+}