SDL_ttf显示故障

如何解决SDL_ttf显示故障

我正在尝试在SDL中使用真型字体显示字符串“ hey”，但存在故障。这是应显示的文本（我进行了屏幕录像，因此此镜头的下部只是视频播放器的控件）：

这是一个小故障：

如您所见，字母“ h”的上部缺失。

这是我使用的代码：

#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#include <iostream>
#include <string>

int fatal( std::string m ) {
    std::cout << "Fatal error: " << m << "\n";
    exit(-1);   
}

void drawText(TTF_Font* font,SDL_Renderer* r,std::string message) {
    SDL_Color c = {255,255,255};
    SDL_Surface *temp = TTF_RenderText_Blended( font,message.c_str(),c);
    if ( temp == NULL )
        fatal("Failed to create surface");
    SDL_Texture *txt = SDL_CreateTextureFromSurface( r,temp );
    if ( txt == NULL )
        fatal("Failed to create texture");
    SDL_FreeSurface( temp );
    SDL_Rect src;
    src.x = 0;
    src.y = 0;
    SDL_QueryTexture( txt,NULL,&src.w,&src.h );
    SDL_Rect pos;
    pos.x = 80;
    pos.y = 80;
    pos.w = src.w;
    pos.h = src.h;
    if ( SDL_Rendercopy(r,txt,&src,&pos) != 0)
        fatal("SDL_Rendercopy Failed");
    SDL_DestroyTexture(txt);    
}

extern "C" int main( int argc,char** argv ) {
    SDL_Renderer *renderer;
    SDL_Window *window;
    if ( SDL_Init( SDL_INIT_VIDEO ) != 0 )
        fatal("sdl_init Failed");
    if ( TTF_Init() != 0 )
        fatal("ttf_init Failed");
    if ( SDL_CreateWindowAndRenderer ( 200,200,&window,&renderer ) != 0 )
        fatal("sdl_createwindowandrenderer Failed");
    TTF_Font* font = TTF_OpenFont( "Arial.ttf",30 ); 
    if ( font == NULL ) 
        fatal("Failed to open font");
    SDL_Event e;
    while ( 1 ) {
        if ( SDL_PollEvent(&e) ) {
            if (e.type == SDL_QUIT)
                break;
        }
        // clear back buffer
        SDL_SetRenderDrawColor(renderer,255);
        SDL_RenderClear(renderer);  
        drawText(font,renderer,"hey");
        SDL_RenderPresent(renderer);
    }
    
    return 0;
} 

我使用以下命令在macOS 10.15.6上进行了编译

g++ -std=c++17 textTest.cpp -lSDL2 -lSDL2_ttf