程式語言 - Simple DirectMedia Layer (SDL) - v2.0 - C/C++ - Open Font

參考資訊：
https://wiki.libsdl.org/FrontPage

main.c

#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
#include <SDL_ttf.h>
 
int main(int argc, char **argv)
{
    const int w = 320;
    const int h = 240;
    const int bpp = 16;
    SDL_Window *window = NULL;
    SDL_Surface *screen = NULL;
    SDL_Texture *texture = NULL;
    SDL_Renderer *renderer = NULL;

    SDL_Init(SDL_INIT_VIDEO);
    window = SDL_CreateWindow("main", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
    screen = SDL_CreateRGBSurface(0, w, h, bpp, 0, 0, 0, 0);
    texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB565, SDL_TEXTUREACCESS_STREAMING, w, h);

    TTF_Init();
    TTF_Font *font = TTF_OpenFont("font.ttf", 30);
    SDL_FillRect(screen, &screen->clip_rect, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00));

    int ww = 0, hh = 0;
    SDL_Color col = {0, 255, 0};
    SDL_Rect rt = {0, 100, 0, 0};
    const char *cc = "司徒的教學網站";

    TTF_SizeUTF8(font, cc, &ww, &hh);
    rt.x = (w - ww) / 2;
    SDL_Surface *msg = TTF_RenderUTF8_Solid(font, cc, col);
    SDL_BlitSurface(msg, NULL, screen, &rt);
    SDL_FreeSurface(msg);

    SDL_UpdateTexture(texture, NULL, screen->pixels, screen->pitch);
    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, texture, NULL, NULL);
    SDL_RenderPresent(renderer);

    SDL_Delay(3000);

    TTF_CloseFont(font);
    TTF_Quit();
    SDL_FreeSurface(screen);
    SDL_DestroyTexture(texture);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}

編譯、執行

$ gcc main.c -o main -lSDL2 -lSDL2_ttf -I/usr/include/SDL2
$ ./main