Using SDL_FillRect() for Effective Buffer Management

1#include <SDL.h>
2
3int main(int argc, char** argv) {
4  SDL_Init(SDL_INIT_VIDEO);
5  SDL_Window* window = SDL_CreateWindow(
6    "Fill Rect Example",
7    SDL_WINDOWPOS_UNDEFINED,
8    SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);
9
10  SDL_Surface* surface = SDL_GetWindowSurface(
11    window);
12
13  while (true) {
14    // Define rectangle size and position
15    SDL_Rect rect = {10, 10, 200, 200};
16
17    // Fill rectangle with red
18    SDL_FillRect(surface, &rect, SDL_MapRGB(
19      surface->format, 0xFF, 0x00, 0x00));
20
21    // Update the front buffer with the back
22    // buffer content
23    SDL_UpdateWindowSurface(window);
24  }
25
26  SDL_DestroyWindow(window);
27  SDL_Quit();
28  return 0;
29}