SDL2 显示图片

参考：https://blog.csdn.net/qq_31024569/article/details/77896974

 

完整代码如下:

//Using SDL and standard IO
#include <SDL2/SDL.h>
#include <stdio.h>

//Screen dimension constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

//Starts up SDL and creates window
bool init();

//Loads media
bool loadMedia();

//Frees media and shuts down SDL
void close();

//The window we'll be rendering to
SDL_Window* gWindow = NULL;
 
//The surface contained by the window
SDL_Surface* gScreenSurface = NULL;

//The image we will load and show on the screen
SDL_Surface* gHelloWorld = NULL;

bool init()
{
 //Initialization flag
 bool success = true;

 //Initialize SDL
 if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
 {
  printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
  success = false;
 }
 else
 {
  //Create window
  gWindow = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
  if( gWindow == NULL )
  {
   printf( "Window could not be created! SDL_Error: %s\n", SDL_GetError() );
   success = false;
  }
  else
  {
   //Get window surface
   gScreenSurface = SDL_GetWindowSurface( gWindow );
  }
 }

 return success;
}

bool loadMedia()
{
 //Loading success flag
 bool success = true;

 //Load splash image
 gHelloWorld = SDL_LoadBMP( "hello_world.bmp" );
 if( gHelloWorld == NULL )
 {
  printf( "Unable to load image %s! SDL Error: %s\n", "02_getting_an_image_on_the_screen/hello_world.bmp", SDL_GetError() );
  success = false;
 }

 return success;
}

void close()
{
 //Deallocate surface
 SDL_FreeSurface( gHelloWorld );
 gHelloWorld = NULL;

 //Destroy window
 SDL_DestroyWindow( gWindow );
 gWindow = NULL;

 //Quit SDL subsystems
 SDL_Quit();
}

int main( int argc, char* args[] )
{
 //Start up SDL and create window
 if( !init() )
 {
  printf( "Failed to initialize!\n" );
 }
 else
 {
  //Load media
  if( !loadMedia() )
  {
   printf( "Failed to load media!\n" );
  }
  else
  {
   //Apply the image
   SDL_BlitSurface( gHelloWorld, NULL, gScreenSurface, NULL );
   
   //Update the surface
   SDL_UpdateWindowSurface( gWindow );

   //Wait two seconds
   SDL_Delay( 2000 );
  }
 }

 //Free resources and close SDL
 close();

 return 0;
}