minigui:自定义字体文件的安装位置(install location for custom font)

Myth丶恋晨 2022-05-13 17:12 55阅读 0赞

我们的基于minigui的嵌入式系统项目中使用了True Type字体，原以以为只要把字体文件应用程序所在路径下的字体文件夹(`res/font`)下就可以了，但实际运行时报错了：

NEWGAL>PCXVFB: /usr/local/bin/gvfb 12695 miniStudio Emulator 240x320-16bpp.rgb565 
    FONT>FT2: another error code means that the font file 
                    ... could not be opened or read. or simply that it is                broken ... 
     FONT>DevFont: error in loading font ttf-simkai-rrncnn-0-0-ISO8859-1,GB2312,UTF-8 from /usr/local/share/minigui/res//font/simkai.ttf file.
    FONT>FT2: another error code means that the font file 
                    ... could not be opened or read. or simply that it is                broken ... 
     FONT>DevFont: error in loading font ttf-simkai-rrncnn-0-0-ISO8859-1,GB2312,UTF-8 from font/simkai.ttf file.
    NEWGDI>InitGDI: Can not initialize fonts defined in section truetypefonts!

上面的错误看出，minigui在初始化的时候还是去`/usr/local/share/minigui/res/font`下去找字体了。为了确认minigui初始化字体时的逻辑，查看了代码,下面是`libminigui-3.2.0/src/font/devfont.c`中的`init_or_term_specifical_fonts`函数的片段：

/*add devfont*/
            if ((memres = (MEM_RES*)LoadResource (font_file, RES_TYPE_MEM_RES, 0))) {
        
                AddDevFont (font_name, memres->data, FALSE);
                added_num ++;
            }
            else {
        
                // 调用sysres_get_system_res_path获取minigui系统资源路径,组成字体资源路径font_path
                // 没有尝试从usr_res_path或pwd_res_path去寻找,
                // usr_res_path,pwd_res_path是libminigui-3.2.0/src/sysres/resmgr.c中定义的宏
                if ((0 == mg_path_joint(font_path, MAX_PATH + 1, sysres_get_system_res_path(), font_file)) 
                        && ((AddDevFont (font_name, font_path, TRUE)) == TRUE))
                    added_num++;
                // 尝试从当前路径下font文件夹寻找，
                // 因为在MiniGUI.cfg中字体定义一般是这样的fontfile0=font/Courier-rr-8-13.vbf
                else if ((AddDevFont (font_name, font_file, TRUE)) == TRUE)
                    added_num++;
            }

# 结论 #

minigui初始化字体时只会先在系统资源路径下寻找，然后在当前路径的`font`(不是`res/font`)文件夹下寻找。  
所以如果你不想改minigui的源码，就把自己的字体文件文件放在`/usr/local/share/minigui/res/font`好了