#include <SDL.h>
#include <SDL_image.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include "kiss.h"

char *title = "SDL 05 - Optimized Surface Loading and Soft Stretching";
SDL_Window *window;
SDL_Surface *screen;
SDL_Surface *image;

int
init_sdl(void)
{
   int status = -1;
   int x = SDL_WINDOWPOS_UNDEFINED;
   int y = SDL_WINDOWPOS_UNDEFINED;
   int width = 1200;
   int height = 549;
   int flags = 0;       // SDL_WINDOW_FULLSCREEN_DESKTOP

   SDL_INIT(SDL_INIT_VIDEO);
   IMG_INIT(IMG_INIT_PNG);
   window = SDL_CREATEWINDOW(title, x, y, width, height, flags);
   screen = SDL_GETWINDOWSURFACE(window);
   status = 0;
error:
   return status;
}

#define INIT_SDL(...) SDL_ZERO(init_sdl, __VA_ARGS__)

void
close_sdl(void)
{
   SDL_DestroyWindow(window);
   SDL_Quit();
}

int
draw(void)
{
   int status = -1;
   uint32_t colour = SDL_MapRGB(screen->format, 0xFF, 0x7F, 0x3F);
   SDL_Rect dstrect = { 0, 0, screen->w, screen->h };
   SDL_FILLRECT(screen, NULL, colour);
   SDL_BLITSCALED(image, NULL, screen, &dstrect);
   SDL_UPDATEWINDOWSURFACE(window);
   status = 0;
error:
   return status;
}

#define DRAW(...) SDL_ZERO(draw, __VA_ARGS__)

SDL_Surface *
load_image(char *path, SDL_Surface *screen)
{
   SDL_Surface *surface2 = NULL;
   SDL_Surface *surface = NULL;
   surface = IMG_LOAD(path);
   surface2 = SDL_CONVERTSURFACE(surface, screen->format, 0);
error:
   SDL_FreeSurface(surface);
   return surface2;
}

#define LOAD_IMAGE(...) SDL_CHK(load_image, __VA_ARGS__)

int
main(void)
{
   int exit_status = EXIT_FAILURE;
   bool quit = 0;
   SDL_Event e;

   INIT_SDL();

   image = LOAD_IMAGE("logo.png", screen);
   DRAW();

   while (!quit)
     {
        SDL_WAITEVENT(&e);
        if (e.type == SDL_QUIT)
          quit = 1;
     }

   exit_status = EXIT_SUCCESS;
error:
   SDL_FreeSurface(image);
   close_sdl();
   exit(exit_status);
}