sdl2 window shape test.

shape.c

// https://github.com/libsdl-org/SDL/issues/8791
//strip down version for testing image
// use sdl2 default image bmp test.
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include "SDL.h"
#include <SDL_image.h>
#include "SDL_shape.h"

#define SHAPED_WINDOW_X         150
#define SHAPED_WINDOW_Y         150
#define SHAPED_WINDOW_DIMENSION 640

#undef main

int main(int argc, char **argv)
{

    SDL_Window *window;
    SDL_Renderer *renderer;
    SDL_Color black = { 0, 0, 0, 0xff };
    SDL_Color white = { 255, 255, 255, 0xff };
    SDL_Event event;
    int should_exit = 0;
    int button_down;

    SDL_Init( SDL_INIT_VIDEO );

    window = SDL_CreateShapedWindow("SDL_Shape test",
                                    SHAPED_WINDOW_X, SHAPED_WINDOW_Y,
                                    SHAPED_WINDOW_DIMENSION, SHAPED_WINDOW_DIMENSION,
                                    0);

    //window = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SHAPED_WINDOW_X, SHAPED_WINDOW_Y, SDL_WINDOW_SHOWN );

    SDL_Surface * shape = SDL_LoadBMP("content/p01_shape24.bmp");

    SDL_WindowShapeParams wsp;
    wsp.binarizationCutoff = 255;
    wsp.colorKey = black;

    SDL_WindowShapeMode swsm;
    swsm.mode = ShapeModeColorKey;
    swsm.parameters = wsp;  

    SDL_SetWindowShape(window, shape,  &swsm);
    //SDL_SetWindowShape(window, shape, NULL);

    renderer = SDL_CreateRenderer(window, -1, 0);


  

    should_exit = 0;
    button_down = 0;


    while (should_exit == 0) {
      while (SDL_PollEvent(&event)) {
        switch (event.type)
        		{
        			case SDL_QUIT:
        				should_exit = 1;
        				break;
              case SDL_KEYUP:
                 if (event.key.keysym.scancode == SDL_SCANCODE_ESCAPE) {
                    should_exit = 1;
                }
              break;
        		}
      }
      SDL_RenderPresent(renderer);
  }

  SDL_DestroyRenderer(renderer);
  //Destroy window
    SDL_DestroyWindow( window );
  /* Call SDL_VideoQuit() before quitting. */
    SDL_VideoQuit();
    printf("CLOSE");

    return 0;
}