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使用 fontconfig 进行字体查询
source link: https://blog.lilydjwg.me/2011/10/23/use-fontconfig-to-query-font.30393.html
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使用 fontconfig 进行字体查询
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Vayn想知道如何判断一个字体是否支持中文，我也对字体的种种特性好奇，于是我再一次淹没在文档之中。先是翻了半天Pango的文档，各种字体相关的函数，还找到个pango_has_char函数。不过我没能弄明白怎么它需要的参数类型PangoFcFont怎么弄。后来查到这个函数需要底层支持，于是我直接找到 fontconfig 去了。
fontconfig 的文档不怎么样，虽然后来发现它提供了manpages、PDF、HTML、TXT等格式，但我依旧没能从文档中弄明白如何得到一个字体的信息。看了 fc-query 的源代码才知道，原来FcPattern既用来作输入，也用来作输出。查询字体时它是查询条件，而返回时它就是字体信息。
/* ===================================================================== ** 判断某个字符是否存在于指定的字体（文件）中* ===================================================================== */#include<stdio.h>#include<string.h>#include<fontconfig/fontconfig.h>/* --------------------------------------------------------------------- */int main(int argc, char **argv){int ret = 0;FcChar8* file = (FcChar8*)"/home/lilydjwg/.fonts/迷你简启体.ttf";FcPattern* pat;FcCharSet* cs;FcChar32 ch;int count;FcBlanks* blanks = FcConfigGetBlanks(NULL);pat = FcFreeTypeQuery((FcChar8 *)file, 0, blanks, &count);if(FcPatternGetCharSet(pat, FC_CHARSET, 0, &cs) != FcResultMatch){fprintf(stderr, "no match\n");ret = -1;goto cleanup;}FcUtf8ToUcs4((FcChar8*)"简", &ch, 3);if(FcCharSetHasChar(cs, ch)){puts("Yes");}else{puts("No");}cleanup:FcPatternDestroy(pat);return ret;}/* ===================================================================== ** vim modeline ** vim:se fdm=expr foldexpr=getline(v\:lnum)=~'^\\S.*{'?'>1'\:1: ** ===================================================================== *//* ===================================================================== ** 判断某个字符是否存在于指定的字体（条件匹配）中* ===================================================================== */#include<stdio.h>#include<fontconfig/fontconfig.h>/* --------------------------------------------------------------------- */int main(int argc, char **argv){FcFontSet* fs = NULL;FcPattern* pat = NULL;FcObjectSet* os = NULL;FcChar8* strpat = (FcChar8*)":lang=zh";pat = FcNameParse(strpat);os = FcObjectSetBuild(FC_FAMILY, FC_CHARSET, FC_FILE, (char *)0);fs = FcFontList(0, pat, os);if(os)FcObjectSetDestroy(os);os = NULL;FcPatternDestroy(pat);pat = NULL;if(!fs || fs->nfont <= 0)goto nofont;FcChar8 *family;FcChar8 *file;FcCharSet* cs;FcChar32 ch;FcUtf8ToUcs4((FcChar8*)"这", &ch, 3);int i;for(i=0; i<fs->nfont; i++){if(FcPatternGetCharSet(fs->fonts[i], FC_CHARSET, 0, &cs) != FcResultMatch){fprintf(stderr, "no match\n");FcPatternPrint(fs->fonts[i]);goto nofont;}if(FcPatternGetString(fs->fonts[i], FC_FAMILY, 1, &family) != FcResultMatch)if(FcPatternGetString(fs->fonts[i], FC_FAMILY, 0, &family) != FcResultMatch)goto nofont;printf("[%d] %s ", i, (char *)family);if(FcPatternGetString(fs->fonts[i], FC_FILE, 0, &file) != FcResultMatch)goto nofont;printf("(%s): ", (char *)file);if(FcCharSetHasChar(cs, ch)){puts("Yes");}else{puts("No");}}FcFontSetDestroy(fs);return 0;nofont:return 1;}/* ===================================================================== */Category: Linux | Tags: fontconfig C代码 | Read Count: 10580
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