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湛江百度seo公司,福州搜索引擎优化公司,淄博周村网站建设方案,济宁网站建设服务加载BMP 1.使用SDL_init初始化SDL库 2.使用SDL_CreateWindow创建一个窗口 3.使用SDL_GetWindowSurface获取创建窗口的surface 4.使用SDL_LoadBMP加载一张BMP图片 5.使用SDL_BlitSurface将加载的bmp surface拷贝到窗口的surface 6.使用SDL_UpdateWindowSurface更新到窗口 …加载BMP 1.使用SDL_init初始化SDL库 2.使用SDL_CreateWindow创建一个窗口 3.使用SDL_GetWindowSurface获取创建窗口的surface 4.使用SDL_LoadBMP加载一张BMP图片 5.使用SDL_BlitSurface将加载的bmp surface拷贝到窗口的surface 6.使用SDL_UpdateWindowSurface更新到窗口 7.使用SDL_FreeSurface释放申请的空间 8.使用SDL_DestroyWindow销毁窗口 9.使用SDL_Quit释放SDL库 以下时完整代码 #include iostream #include sdl.hconst int SCREEN_WIDTH 640; const int SCREEN_HEIGHT 480;SDL_Window* gWindow nullptr; SDL_Surface* gScreenSurface nullptr; SDL_Surface* gHelloWorld nullptr;bool init() {bool success true;if (SDL_Init(SDL_INIT_VIDEO) 0){printf(SDL could not initialize!SDL Error:%s\n, SDL_GetError());success false;}else{//create windowgWindow SDL_CreateWindow(SDL tutorial, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);if (gWindow nullptr){printf(window could not created!SDL_Error:%s\n, SDL_GetError());success false;}else{//get window surfacegScreenSurface SDL_GetWindowSurface(gWindow);}}return success; }bool loadMedia() {//loading success flagbool success true;//load splash imagegHelloWorld SDL_LoadBMP(../BMP2.bmp);if (gWindow nullptr){printf(unable to load image!SDL_ERROR%s\n,SDL_GetError());success false;}return success; }void close() {SDL_FreeSurface(gHelloWorld);gHelloWorld NULL;SDL_DestroyWindow(gWindow);gWindow NULL;SDL_Quit();}int main(int argc, char* args[]) {if (!init()){printf(failed to initialize!\n);}else{//load mediaif (!loadMedia()){printf(failed to load media!\n);}else{SDL_BlitSurface(gHelloWorld, nullptr, gScreenSurface, nullptr);//update the surfaceSDL_UpdateWindowSurface(gWindow);SDL_Event e;bool quit false;while (quit false){while (SDL_PollEvent(e)){if (e.type SDL_QUIT)quit true;}}}}close();return 0; } 加载PNG 由于默认的SDL库只能加载BMP格式的图片如果需要加载png等其他格式的图片需要下载一个扩展库SDL_image​​​​​​ 这里我们下载SDL2_image-devel-2.6.3-VC.zipSDL_image​​​​​​ 加载步骤与加载BMP步骤差不多这里需要注意以下几点 1.需要使用IMG_Init初始化iamge库 2. 使用IMG_Load加载png图片之前使用SDL_LoadBMP加载BMP 3.使用IMG_Quit释放image库 以下是完整代码 #include iostream #include sdl.h #include sdl_image.h #include stringusing namespace std;const int SCREEN_WIDTH 640; const int SCREEN_HEIGHT 480;SDL_Surface* loadSurface(std::string path);SDL_Window* gWindow nullptr;SDL_Surface* gScreenSurface nullptr;SDL_Surface* gPNGSurface nullptr;bool init() {bool success true;//initialize SDLif (SDL_Init(SDL_INIT_VIDEO) 0){printf(SDL_ERROR:%s\n, SDL_GetError());success false;}else{//create windowgWindow SDL_CreateWindow(SDL load PNG, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );if (gWindow nullptr){printf(SDL_ERROR:%s\n, SDL_GetError());success false;}else{//initialize PNG loadingint imgFlag IMG_INIT_PNG;if (!(IMG_Init(imgFlag) imgFlag)){printf(SDL_IMAGE could not initialize!SDL_IMAGE ERROR: %s\n, IMG_GetError());success false;}else{//get window surfacegScreenSurface SDL_GetWindowSurface(gWindow);}}}return success; }SDL_Surface* loadSurface(string path) {SDL_Surface* optimizedSurface nullptr;//load image at specified pathSDL_Surface* loadSurface IMG_Load(path.c_str());if (loadSurface nullptr){printf(load image error: %s\n, IMG_GetError());}else{//convert surface to screen formatoptimizedSurface SDL_ConvertSurface(loadSurface, gScreenSurface-format, 0);if (optimizedSurface nullptr){printf(unable to optimize image: %s\n, SDL_GetError());}//get rid of old loaded surfaceSDL_FreeSurface(loadSurface);}return optimizedSurface; }bool loadMedia() {//Loading success flagbool success true;//Load PNG surfacegPNGSurface loadSurface(../picture/loaded.png);if (gPNGSurface NULL){printf(Failed to load PNG image!\n);success false;}return success; }void close() {SDL_FreeSurface(gPNGSurface);gPNGSurface nullptr;SDL_DestroyWindow(gWindow);gWindow nullptr;IMG_Quit();SDL_Quit(); }int main(int argc, char* argv[]) {if (!init()){printf(Failed to initialize!\n);}else{//Load mediaif (!loadMedia()){printf(Failed to load media!\n);}else{//Main loop flagbool quit false;//Event handlerSDL_Event e;//While application is runningwhile (!quit){//Handle events on queuewhile (SDL_PollEvent(e) ! 0){//User requests quitif (e.type SDL_QUIT){quit true;}}//Apply the PNG imageSDL_BlitSurface(gPNGSurface, NULL, gScreenSurface, NULL);//Update the surfaceSDL_UpdateWindowSurface(gWindow);}}}//Free resources and close SDLclose();return 0; }