掌機 - Miyoo Mini Plus - C/C++ - SDL v2.0 - Open Font from Memory


main.c

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#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
#include <SDL_ttf.h>
   
#include "hex_font.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();
    SDL_RWops *rw = SDL_RWFromMem(hex_font, sizeof(hex_font));
    TTF_Font *font = TTF_OpenFontRW(rw, 1, 30);
    SDL_FillRect(screen, &screen->clip_rect, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00));
  
    SDL_Color col = {0, 255, 0};
    SDL_Rect rt = {50, 100, 0, 0};
    SDL_Surface *msg = TTF_RenderUTF8_Solid(font, "Miyoo Handheld", 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(30000);
  
    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 

$ bin2header font.ttf hex_font > hex_font.h
$ /opt/mini/bin/arm-linux-gnueabihf-gcc \
    -I/opt/mini/arm-buildroot-linux-gnueabihf/sysroot/usr/include/SDL2 \
    -lSDL2 -lSDL2_gfx -lSDL2_image -lSDL2_ttf -lSDL2_mixer -lGLESv2 \
    main.c -o main

# kill -STOP `pidof MainUI`
# LD_LIBRARY_PATH=.:/config/lib:/customer/lib ./main
# kill -CONT `pidof MainUI`