编译 freetype、sdl、sdl

编译 freetype、sdl、sdl_ttf

/*
* three lib
*/
    /* 字符串生成位图 */
    http://www.libsdl.org/projects/SDL_ttf/release/
    http://www.libsdl.org/download-1.2.php
    https://freetype.org/

/* Freetype 2.13.0 */
./configure CC=aarch64-v01c01-linux-gnu-gcc --build=aarch64 --host=aarch64-v01c01-linux-gnu --enable-shared=no --enable-static=yes --with-zlib=no --prefix=/home/share/work/osd/three-lib/freetype/ --exec-prefix=/home/share/work/osd/three-lib/freetype

/* SDL 2.30.3 */
./configure CC=aarch64-v01c01-linux-gnu-gcc --build=aarch64 --host=aarch64-v01c01-linux-gnu --enable-shared=no --enable-static=yes --enable-video-wayland=no --enable-pulseaudio=no --prefix=/home/share/work/osd/three-lib/sdl/ --exec-prefix=/home/share/work/osd/three-lib/sdl

/* SDL_tff 2.22.0 */
./configure CC=aarch64-v01c01-linux-gnu-gcc --build=aarch64 --host=aarch64-v01c01-linux-gnu --enable-shared=no --enable-static=yes --prefix=/home/share/work/osd/three-lib/sdl_ttf/ --exec-prefix=/home/share/work/osd/three-lib/sdl_ttf --with-sdl-prefix=/home/share/work/osd/three-lib/sdl --with-sdl-exec-prefix=/home/share/work/osd/three-lib/sdl --with-ft-prefix=/home/share/work/osd/three-lib/freetype/ --with-ft-exec-prefix=/home/share/work/osd/three-lib/freetype

例子：

#include <stdio.h>
#include <time.h>
#include "SDL.h"
#include "SDL_ttf.h"

int main(int argc, const char *argv[])
{
    char * pstr = "2024-06-04 18:00:29";
    SDL_PixelFormat *fmt;
    TTF_Font *font;
    SDL_Surface *text, *temp;

    if (TTF_Init() < 0 )
    {
        fprintf(stderr, "Couldn't initialize TTF: %s\n",SDL_GetError());
        SDL_Quit();
    }

    font = TTF_OpenFont("Roboto-Regular.ttf", 48);
    if ( font == NULL )
    {
        fprintf(stderr, "Couldn't load %d pt font from %s: %s\n", 48, "ptsize", SDL_GetError());
    }

SDL_Color forecol = { 0xff, 0xff, 0xff, 0xff };
text = TTF_RenderUTF8_Solid(font, pstr, forecol);

    fmt = (SDL_PixelFormat*)malloc(sizeof(SDL_PixelFormat));
    memset(fmt,0,sizeof(SDL_PixelFormat));
    fmt->BitsPerPixel = 16;
    fmt->BytesPerPixel = 2;
    //fmt->colorkey = 0xffffffff;
    //fmt->alpha = 0xff;

temp = SDL_ConvertSurface(text, fmt, 0);
SDL_SaveBMP(temp, "save.bmp");

    SDL_FreeSurface(text);
    SDL_FreeSurface(temp);
    TTF_CloseFont(font);
    TTF_Quit();

return 0;
}

例子编译：

    /* test */
    /* gcc 依赖库是从右往左 */
    aarch64-v01c01-linux-gnu-gcc -o osd_test test.c -I/home/share/work/osd/three-lib/sdl/include/SDL2 -I/home/share/work/osd/three-lib/sdl_ttf/include/SDL2 -L/home/share/work/osd/three-lib/freetype/lib -L/home/share/work/osd/three-lib/sdl/lib -L/home/share/work/osd/three-lib/sdl_ttf/lib -lfreetype -lSDL2 -lSDL2_ttf -lpthread -lm

效果：