ppdfviewer, basic, bits and string view

c/files/files3/main.c

@@ -1,8 +1,18 @@
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_error.h>
+#include <SDL2/SDL_events.h>
+#include <SDL2/SDL_log.h>
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_video.h>
+#include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+void render_image(SDL_Renderer *ref_renderer, unsigned char *data,
+                  unsigned long w, unsigned long h);
+
 int main(int argc, char *argv[]) {
     if (argc < 2) {
         fprintf(stderr, "Argumentos invalidos\n");
@@ -79,7 +89,78 @@ int main(int argc, char *argv[]) {
         fclose(pfile);
     }
 
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        perror("SLD_Init");
+        free(data);
+        fclose(pfile);
+        return 1;
+    }
+
+    SDL_Window *window =
+        SDL_CreateWindow("Visor de imagenes", SDL_WINDOWPOS_CENTERED,
+                         SDL_WINDOWPOS_CENTERED, w, h, SDL_WINDOW_SHOWN);
+
+    if (window == NULL) {
+        SDL_Log("SLD_WINDOW: %s", SDL_GetError());
+        SDL_Quit();
+        free(data);
+        fclose(pfile);
+        return 1;
+    }
+
+    SDL_Renderer *renderer = SDL_CreateRenderer(
+        window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+
+    if (!renderer) {
+        SDL_Log("No se pudo crear el renderizador: %s", SDL_GetError());
+        SDL_DestroyWindow(window);
+        SDL_Quit();
+        free(data);
+        fclose(pfile);
+        return 1;
+    }
+
+    bool running = true;
+    SDL_Event ev;
+    while (running) {
+        while (SDL_PollEvent(&ev)) {
+            if (ev.type == SDL_QUIT) {
+                running = 0; // Si hacen clic en la "X", salimos
+            }
+            if (ev.type == SDL_KEYDOWN) {
+                // Si presionan Escape, salimos
+                if (ev.key.keysym.sym == SDLK_ESCAPE) {
+                    running = 0;
+                }
+            }
+        }
+
+        SDL_RenderClear(renderer);
+        render_image(renderer, data, w, h);
+        SDL_RenderPresent(renderer);
+    }
+
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+
     free(data);
     fclose(pfile);
     return 0;
 }
+
+void render_image(SDL_Renderer *ref_renderer, unsigned char *rdata,
+                  unsigned long int w, unsigned long h) {
+
+    unsigned long offset = 0;
+    for (unsigned long cury = 0; cury < h; cury++) {
+        for (unsigned long curx = 0; curx < w; curx++) {
+            uint8_t r = *(rdata + offset++);
+            uint8_t g = *(rdata + offset++);
+            uint8_t b = *(rdata + offset++);
+
+            SDL_SetRenderDrawColor(ref_renderer, r, g, b, 255);
+            SDL_RenderDrawPoint(ref_renderer, curx, cury);
+        }
+    }
+}