SDL2.0_03_SDL_image Library

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扩展库SDL_Image，运行的时候需要把zlib1.dll，libjpeg-9.dll，libpng16-16.dll一同拷到目录里，不然不会报错，但就是运行没显示结果。

代码是在上一课的基础上略加修改的。

#include <iostream>#include <windows.h>#include <string>using namespace std;#include <SDL.h>#include <SDL_image.h>const int SCREEN_WIDTH = 640;const int SCREEN_HEIGHT = 480;SDL_Window *win = nullptr;SDL_Renderer *ren = nullptr;SDL_Texture * LoadImage(string file) {SDL_Texture *tex = nullptr;tex = IMG_LoadTexture(ren, file.c_str());if (tex == nullptr) {cout << "Fail to load image in function LoadImage()!" << endl;}return tex;}void ApplySurface(int x, int y, SDL_Texture *tex, SDL_Renderer *ren){SDL_Rect pos;pos.x = x;pos.y = y;SDL_QueryTexture(tex, NULL, NULL, &pos.w, &pos.h);SDL_RenderCopy(ren, tex, NULL, &pos);}int main(int argc, char** argv){if (SDL_Init(SDL_INIT_EVERYTHING) == -1) {cout << SDL_GetError() << endl;return 0;}win = SDL_CreateWindow("02:", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_RESIZABLE);if (win == nullptr) {cout << SDL_GetError() << endl;return 0;}ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);if (ren == nullptr) {cout << SDL_GetError() << endl;return 0;}SDL_Texture *bg = LoadImage("f:/material/giantShadowFlash.jpg");SDL_Texture *fg = LoadImage("F:/material/bubble.png");if (bg == nullptr || fg == nullptr) {cout << "Could not load one of the images!" << endl;return 0;}SDL_RenderClear(ren);int bw, bh;SDL_QueryTexture(bg, NULL, NULL, &bw, &bh);ApplySurface(0, 0, bg, ren);ApplySurface(bw, 0, bg, ren);ApplySurface(0, bh, bg, ren);ApplySurface(bw, bh, bg, ren);SDL_QueryTexture(fg, NULL, NULL, &bw, &bh);ApplySurface(SCREEN_WIDTH / 2 - bw / 2, SCREEN_HEIGHT / 2 - bh / 2, fg, ren);SDL_RenderPresent(ren);SDL_Delay(2000);SDL_DestroyTexture(bg);SDL_DestroyTexture(fg);SDL_DestroyRenderer(ren);SDL_DestroyWindow(win);SDL_Quit();cout << "Success!" << endl;return 0;}

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