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minigui:自定義字型檔案的安裝位置(install location for custom font)

我們的基於minigui的嵌入式系統專案中使用了True Type字型,原以以為只要把字型檔案應用程式所在路徑下的字型資料夾(res/font)下就可以了,但實際執行時報錯了:

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!

上面的錯誤看出,minigui在初始化的時候還是去/usr/local/share/minigui/res/font下去找字型了。為了確認minigui初始化字型時的邏輯,查看了程式碼,下面是libminigui-3.2.0/src/font/devfont.c中的init_or_term_specifical_fonts函式的片段:

        /*add devfont*/
        if ((memres = (MEM_RES*)LoadResource (font_file, RES_TYPE_MEM_RES, 0))) {
            AddDevFont (font_name,
memres->data, FALSE); added_num ++; } else { // 呼叫sysres_get_system_res_path獲取minigui系統資源路徑,組成字型資源路徑font_path // 沒有嘗試從usr_res_path或pwd_res_path去尋找, // usr_res_path,pwd_res_path是libminigui-3.2.0/src/sysres/resmgr.c中定義的巨集 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++; // 嘗試從當前路徑下font資料夾尋找, // 因為在MiniGUI.cfg中字型定義一般是這樣的fontfile0=font/Courier-rr-8-13.vbf else if ((AddDevFont (font_name, font_file, TRUE)) == TRUE) added_num++; }

結論

minigui初始化字型時只會先在系統資源路徑下尋找,然後在當前路徑的font(不是res/font)資料夾下尋找。
所以如果你不想改minigui的原始碼,就把自己的字型檔案檔案放在/usr/local/share/minigui/res/font好了