C++ FcPatternGetString函数代码示例

	std::string FontConfig::match_font(const std::string &typeface_name, const FontDescription &desc) const
	{
		FcPattern * fc_pattern = nullptr;
		FcPattern * fc_match = nullptr;
		try
		{
			int weight = static_cast<int>(desc.get_weight());

			// Build font matching pattern.
			fc_pattern = FcPatternBuild(nullptr,
				FC_FAMILY, FcTypeString, typeface_name.c_str(),
				FC_PIXEL_SIZE, FcTypeDouble, (double)std::abs(desc.get_height()),
				FC_WEIGHT, FcTypeInteger, (weight > 0) ? (int)(weight * (FC_WEIGHT_HEAVY / 900.0)) : FC_WEIGHT_NORMAL,
				FC_SLANT, FcTypeInteger, (desc.get_style() == clan::FontStyle::italic) ? FC_SLANT_ITALIC : ((desc.get_style() == clan::FontStyle::oblique) ? FC_SLANT_OBLIQUE : FC_SLANT_ROMAN),
				FC_SPACING, FcTypeInteger, FC_PROPORTIONAL,
				(char*) nullptr
				);
			if (!fc_pattern)
			{
				throw Exception("CL_FontConfig: Building FontConfig pattern failed.");
			}

			// Execute any needed param substitutions required by the system config.
			if (FcTrue != FcConfigSubstitute(fc_config, fc_pattern, FcMatchPattern))
			{
				throw Exception("CL_FontConfig: Font config substitutions failed.");
			}

			// Supply default values for underspecified font patterns. Never fails.
			FcDefaultSubstitute(fc_pattern);

			// Find best match for pattern and extract filename.
			FcResult match_result; // Doesn't appear to be actually updated.
			fc_match = FcFontMatch(fc_config, fc_pattern, &match_result);
			FcChar8 * fc_font_file_path = nullptr;
			if (FcResultMatch != FcPatternGetString(fc_match, FC_FILE, 0, &fc_font_file_path))
			{
				throw Exception("CL_FontConfig: Could not resolve font pattern to a font file.");
			}

			// Release resources and return results.
			std::string cl_font_file_path((char*)fc_font_file_path);
			FcPatternDestroy(fc_match);
			FcPatternDestroy(fc_pattern);
			return cl_font_file_path;
		}
		catch (...)
		{
			// If any exceptions thrown, ensure fontconfig resources are released.
			if (fc_match) FcPatternDestroy(fc_match);
			if (fc_pattern) FcPatternDestroy(fc_pattern);
			throw;
		}
	}

FontFileLister::CollectionResult FontConfigFontFileLister::GetFontPaths(std::string const& facename, int bold, bool italic, std::set<wxUniChar> const& characters) {
	CollectionResult ret;

	std::string family(facename);
	if (family[0] == '@')
		family.erase(0, 1);
	boost::to_lower(family);

	int weight = bold == 0 ? 80 :
	             bold == 1 ? 200 :
	                         bold;
	int slant  = italic ? 110 : 0;

	// Create a fontconfig pattern to match the desired weight/slant
	agi::scoped_holder<FcPattern*> pat(FcPatternCreate(), FcPatternDestroy);
	if (!pat) return ret;

	FcPatternAddBool(pat, FC_OUTLINE, true);
	FcPatternAddInteger(pat, FC_SLANT, slant);
	FcPatternAddInteger(pat, FC_WEIGHT, weight);

	FcDefaultSubstitute(pat);
	if (!FcConfigSubstitute(config, pat, FcMatchPattern)) return ret;

	// Create a font set with only correctly named fonts
	// This is needed because the patterns returned by font matching only
	// include the first family and fullname, so we can't always verify that
	// we got the actual font we were asking for after the fact
	agi::scoped_holder<FcFontSet*> fset(FcFontSetCreate(), FcFontSetDestroy);
	find_font(FcConfigGetFonts(config, FcSetApplication), fset, family);
	find_font(FcConfigGetFonts(config, FcSetSystem), fset, family);

	// Get the best match from fontconfig
	FcResult result;
	FcFontSet *sets[] = { (FcFontSet*)fset };
	agi::scoped_holder<FcPattern*> match(FcFontSetMatch(config, sets, 1, pat, &result), FcPatternDestroy);
	if (!match)
		return ret;

	FcChar8 *file;
	if(FcPatternGetString(match, FC_FILE, 0, &file) != FcResultMatch)
		return ret;

	FcCharSet *charset;
	if (FcPatternGetCharSet(match, FC_CHARSET, 0, &charset) == FcResultMatch) {
		for (wxUniChar chr : characters) {
			if (!FcCharSetHasChar(charset, chr))
				ret.missing += chr;
		}
	}

	ret.paths.emplace_back((const char *)file);
	return ret;
}

std::string
XeTeXFontMgr_FC::getPlatformFontDesc(PlatformFontRef font) const
{
    std::string path;
    FcChar8* s;
    if (FcPatternGetString(font, FC_FILE, 0, (FcChar8**)&s) == FcResultMatch)
        path = (char*)s;
    else
        path = "[unknown]";
    return path;
}

// This method just need to bypass the cache as we could register our alternative font.
// This is a pity but is required to have asian fonts working.
PassRefPtr<SimpleFontData> FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
{
    // Avoid copying FontPlatformData.
    RefPtr<FontPlatformData> primaryFontPlatformData = font.primaryFont()->m_font;

    // Check if the cache was already filled.
    if (fallbacks.contains(&font)) {
        ASSERT(primaryFontPlatformData->m_fallbacks);
        FontFallbackCache::iterator it = fallbacks.find(&font);
        return it->second;
    }

    if (!primaryFontPlatformData->m_fallbacks) {
        FcResult fresult;
        primaryFontPlatformData->m_fallbacks = FcFontSort(NULL, primaryFontPlatformData->m_pattern, FcTrue, NULL, &fresult);
    }

    FcFontSet* fs = primaryFontPlatformData->m_fallbacks;
    
    for (int i = 0; i < fs->nfont; i++) {
        FcPattern* fin = FcFontRenderPrepare(0, primaryFontPlatformData->m_pattern, fs->fonts[i]);

        FcChar8* fc_filename;
        if (FcPatternGetString(fin, FC_FILE, 0, &fc_filename) != FcResultMatch)
            continue;

        char* filename = (char *) fc_filename; // Use C cast as FcChar is a fontconfig type.

        int id;
        if (FcPatternGetInteger(fin, FC_INDEX, 0, &id) != FcResultMatch)
            continue;

        FT_Face face;
        if (FT_Error error = FT_New_Face(FontPlatformData::m_library, filename, id, &face)) {
            printf("FT_New_Face failed for filename = %s with FT_Error = %d\n", filename, error);
            continue;
        }

        // FIXME: is it really necessary ?
        FT_Set_Pixel_Sizes(face, 0, static_cast<uint> (font.fontDescription().computedSize()));

        RefPtr<FontPlatformData> platformData = adoptRef(new FontPlatformData(face, font.fontDescription().computedPixelSize(), false, false));
        platformData->m_pattern = fin;

        if (platformData->containsCharacters(characters, length)) {
            RefPtr<SimpleFontData> fontData = adoptRef(new SimpleFontData(platformData.get()));
            fallbacks.add(&font, fontData);
            return fontData;
        }
    }
    // Fallback: use the font in the main cache.
    RefPtr<SimpleFontData> fontData = getCachedFontData(font.fontDescription(), font.family().family());
    return fontData;
}

static void family_info(const FcPattern *pattern, family_info_t *fi)
{
  FcChar8 *str;

  fi->fontformat[0] = '\0';
  fi->capability[0] = '\0';
  fi->foundry[0] = '\0';
  
  if (FcPatternGetString(pattern, FC_FONTFORMAT, 0, &str) == FcResultMatch)
    snprintf(fi->fontformat, FONTFORMAT_MAX, "%s", str);


  if (FcPatternGetString(pattern, FC_CAPABILITY, 0, &str) == FcResultMatch)
    snprintf(fi->capability, CAPABILITY_MAX, "%s", str);

  if (FcPatternGetString(pattern, FC_FOUNDRY, 0, &str) == FcResultMatch)
    if (strcmp((char *)str, "unknown") != 0)
      snprintf(fi->foundry, FOUNDRY_MAX, "%s", str);

  return;
}

FcResult fcinfo_get_translated_string(const FcPattern *pattern, 
                                      const char *object, 
                                      const FcChar8 *lang, FcChar8 **s)
{
  FcChar8 *l;
  int n;
  FcResult r;
  const char *lang_object;

  if (strcmp(object, FC_FAMILY) == 0)
    lang_object = FC_FAMILYLANG;
  else if (strcmp(object, FC_STYLE) == 0)
    lang_object = FC_STYLELANG;
  else if (strcmp(object, FC_FULLNAME))
    lang_object = FC_FULLNAMELANG;
  else
  {
    fprintf(stderr, "fcinfo_get_translated_string():"
                    " no translatable string\n");
    exit (1);
  }

  if (FcPatternGetString(pattern, lang_object, 0, &l) != FcResultMatch)
  {
    /* no *_LANG element */
    return FcPatternGetString(pattern, object, 0, s);
  }

  n = 0;
  while ((r = FcPatternGetString(pattern, lang_object, n, &l)) == FcResultMatch)
    if (FcStrCmp(l, lang) == 0)
      break;
    else
      n++;
    
  if (r != FcResultMatch)
    n = 0; /* no lang found */
  
  return FcPatternGetString(pattern, object, n, s);
}

void Rcairo_set_font(int i, const char *fcname){
	FcFontSet	*fs;
	FcPattern   *pat, *match;
	FcResult	result;
	FcChar8	*file;
	int j;

	if (Rcairo_fonts[i].face != NULL){
		cairo_font_face_destroy(Rcairo_fonts[i].face);
		Rcairo_fonts[i].face = NULL;
	}

	pat = FcNameParse((FcChar8 *)fcname);
	if (!pat){
		error("Problem with font config library in Rcairo_set_font\n");
		return;
	}
	FcConfigSubstitute (0, pat, FcMatchPattern);
	FcDefaultSubstitute (pat);

	fs = FcFontSetCreate ();
	match = FcFontMatch (0, pat, &result);
	FcPatternDestroy (pat);
	if (match) {
		FcFontSetAdd (fs, match);
	} else {
		error("No font found in Rcairo_set_font");
		FcFontSetDestroy (fs);
		return;
	}

	/* should be at least one font face in fontset */
	if (fs) {

		for (j = 0; j < fs->nfont; j++) {

			/* Need to make sure a real font file exists */
			if (FcPatternGetString (fs->fonts[j], FC_FILE, 0, &file) == FcResultMatch){
				Rcairo_fonts[i].face = Rcairo_set_font_face(i,(const char *)file);
				break;
			}
		}
		FcFontSetDestroy (fs);
		Rcairo_fonts[i].updated = 1;
	} else {
		error("No font found Rcairo_set_font");
	}

}

const std::string find_font(const char* name) {
	std::string font_file;
	FcConfig* config = FcInitLoadConfigAndFonts();
	FcPattern* pattern = FcNameParse((const FcChar8*) (name));
	FcConfigSubstitute(config, pattern, FcMatchPattern);
	FcDefaultSubstitute(pattern);
	FcPattern* font = FcFontMatch(config, pattern, NULL);
	if (font) {
		FcChar8* file = NULL;
		if (FcPatternGetString(font, FC_FILE, 0, &file) == FcResultMatch)
			font_file = std::string((char*) file);
		FcPatternDestroy(font);
	}
	FcPatternDestroy(pattern);
	return font_file;
}

/**
 * \brief Case-insensitive match ASS/SSA font family against full name. (also
 * known as "name for humans")
 *
 * \param lib library instance
 * \param priv fontconfig instance
 * \param family font fullname
 * \param bold weight attribute
 * \param italic italic attribute
 * \return font set
 */
static FcFontSet *
match_fullname(ASS_Library *lib, FCInstance *priv, const char *family,
               unsigned bold, unsigned italic)
{
    FcFontSet *sets[2];
    FcFontSet *result = FcFontSetCreate();
    int nsets = 0;
    int i, fi;

    if (!result)
        return NULL;

    if ((sets[nsets] = FcConfigGetFonts(priv->config, FcSetSystem)))
        nsets++;
    if ((sets[nsets] = FcConfigGetFonts(priv->config, FcSetApplication)))
        nsets++;

    // Run over font sets and patterns and try to match against full name
    for (i = 0; i < nsets; i++) {
        FcFontSet *set = sets[i];
        for (fi = 0; fi < set->nfont; fi++) {
            FcPattern *pat = set->fonts[fi];
            char *fullname;
            int pi = 0, at;
            FcBool ol;
            while (FcPatternGetString(pat, FC_FULLNAME, pi++,
                   (FcChar8 **) &fullname) == FcResultMatch) {
                if (FcPatternGetBool(pat, FC_OUTLINE, 0, &ol) != FcResultMatch
                    || ol != FcTrue)
                    continue;
                if (FcPatternGetInteger(pat, FC_SLANT, 0, &at) != FcResultMatch
                    || at < italic)
                    continue;
                if (FcPatternGetInteger(pat, FC_WEIGHT, 0, &at) != FcResultMatch
                    || at < bold)
                    continue;
                if (strcasecmp(fullname, family) == 0) {
                    FcFontSetAdd(result, FcPatternDuplicate(pat));
                    break;
                }
            }
        }
    }

    return result;
}

static const char * claro_ft2_get_family(claro_font_pattern_t * pattern)
{
    FcPattern * fc_pattern;
    FcResult res;
    FcChar8 * family;

    g_return_val_if_fail(pattern != NULL, NULL);

    fc_pattern = (FcPattern *)pattern->native;

    res = FcPatternGetString (fc_pattern, FC_FAMILY, 0, &family);

    if(res != FcResultMatch)
        return NULL;
    else
        return (const char *)family;
}

/**
 * using fontconfig for just getting the font file name by a wanted font name and style.
 */
char *get_font_filename(const char *family, const char *style) {
	//initialize fontconfig
	if (!FcInit()) {
		throw util::Error{MSG(err) << "Failed to initialize fontconfig."};
	}

	//FcPattern *font_pattern = FcNameParse((const unsigned char *)"DejaVu Serif:style=Book");
	FcPattern *font_pattern = FcPatternBuild(nullptr, FC_FAMILY, FcTypeString, family, nullptr);
	FcPatternBuild(font_pattern, FC_STYLE, FcTypeString, style, nullptr);

	//debug output: display above pattern as parsable string.
	FcChar8 *query_string = FcNameUnparse(font_pattern);
	log::log(MSG(info) << "Font queried: " << query_string);
	free(query_string);

	//tell fontconfig to find the best match
	FcResult font_match_result;
	FcPattern *font_match = FcFontMatch(nullptr, font_pattern, &font_match_result);

	/*
	//debug output: display matching font pattern as parsable string
	FcChar8 *match_string = FcNameUnparse(font_match);
	log::dbg2("resulting font: %s", match_string);
	free(match_string);
	*/

	//get attibute FC_FILE (= filename) of best-matched font
	FcChar8 *font_filename_tmp;
	if (FcPatternGetString(font_match, FC_FILE, 0, &font_filename_tmp) != FcResultMatch) {
		throw util::Error(MSG(err) << "Fontconfig could not provide font " << family << " " << style);
	}

	//copy the font filename because it will be freed when the pattern is destroyed.
	char *font_filename = util::copy((const char *)font_filename_tmp);

	log::log(MSG(info) << "Font file: " << font_filename);

	//deinitialize fontconfig.
	FcPatternDestroy(font_match);
	FcPatternDestroy(font_pattern);
	FcFini();

	return font_filename;
}

/** Find a font file from its family name.
 * @param font_config fontconfig instance
 * @param font_name name of the font
 * @return full path to the font file
 */
gchar* find_font_file (FcConfig* font_config, const gchar* font_name) {
	const FcChar8* name;
	FcPattern* search_pattern;
	FcPattern* font;
	FcChar8* file;
	gchar* path;
	FcObjectSet* font_properties;
	FcFontSet* fonts;
	int i;

	if (font_config == NULL) {
		g_warning("Font config not loaded.");
		return NULL;
	}
	
	path = NULL;
	name = font_name;

	search_pattern = FcPatternCreate ();
	FcPatternAddString (search_pattern, FC_FAMILY, name);
	FcPatternAddBool (search_pattern, FC_SCALABLE, FcTrue);
	FcPatternAddInteger (search_pattern, FC_WEIGHT, FC_WEIGHT_MEDIUM);
	FcPatternAddInteger (search_pattern, FC_SLANT, FC_SLANT_ROMAN);
		
	font_properties = FcObjectSetBuild (FC_FILE, NULL);
	fonts = FcFontList (font_config, search_pattern, font_properties);
	
	if (fonts->nfont > 0) {
		for (i = 0; i < fonts->nfont; i++) {
			font = fonts->fonts[i];
			
			if (FcPatternGetString(font, FC_FILE, 0, &file) == FcResultMatch) {
				path = g_strdup ((gchar*) file);
				break;
			}
		}
		FcPatternDestroy (font);
	}

	FcPatternDestroy (search_pattern);
	
	return path;
}

const SimpleFontData* FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
{
    FcResult fresult;
    // Avoid copying FontPlatformData.
    FontPlatformData* prim = const_cast<FontPlatformData*>(&font.primaryFont()->m_font);

    if (!prim->m_fallbacks)
        prim->m_fallbacks = FcFontSort(NULL, prim->m_pattern, FcTrue, NULL, &fresult);

    FcFontSet* fs = prim->m_fallbacks;
    
    FT_Library library = FontPlatformData::m_library;

    FcChar8* fc_filename;
    char* filename;
    int id;
    FT_Face face;
    for (int i = 0; i < fs->nfont; i++) {
        FcPattern* fin = FcFontRenderPrepare(0, prim->m_pattern, fs->fonts[i]);

        if (FcPatternGetString(fin, FC_FILE, 0, &fc_filename) != FcResultMatch)
            continue;

        filename = (char *) fc_filename; // Use C cast as FcChar is a fontconfig type.

        if (FcPatternGetInteger(fin, FC_INDEX, 0, &id) != FcResultMatch)
            continue;

        if (FT_Error error = FT_New_Face(library, filename, id, &face))
            continue;

        // FIXME: is it really necessary ?
        FT_Set_Pixel_Sizes(face, 0, static_cast<uint> (font.fontDescription().computedSize()));

        FontPlatformData alternateFont(face, font.fontDescription().computedPixelSize(), false, false);
        // FIXME: FT_Done_Face(face); we should clean the face correctly the FT_Face but we can't do that here...
        alternateFont.m_pattern = fin;
        SimpleFontData* sfd = getCachedFontData(&alternateFont);
        if (sfd->containsCharacters(characters, length))
            return sfd;
    }
    return 0;
}

Vector<String> FontCache::systemFontFamilies()
{
    RefPtr<FcPattern> scalablesOnlyPattern = adoptRef(FcPatternCreate());
    FcPatternAddBool(scalablesOnlyPattern.get(), FC_SCALABLE, FcTrue);

    FcUniquePtr<FcObjectSet> familiesOnly(FcObjectSetBuild(FC_FAMILY, nullptr));
    FcUniquePtr<FcFontSet> fontSet(FcFontList(nullptr, scalablesOnlyPattern.get(), familiesOnly.get()));

    Vector<String> fontFamilies;
    for (int i = 0; i < fontSet->nfont; i++) {
        FcPattern* pattern = fontSet->fonts[i];
        FcChar8* family = nullptr;
        FcPatternGetString(pattern, FC_FAMILY, 0, &family);
        if (family)
            fontFamilies.appendVector(patternToFamilies(*pattern));
    }

    return fontFamilies;
}

FcStrSet *fcinfo_fontformats(const FcPattern *filter)
{
  FcFontSet *fontset;
  FcStrSet *result;
  FcChar8 *format;
  int f;

  FcInit();
  fontset = fcinfo(NULL, filter, FcFalse, 1, FC_FONTFORMAT);

  result = FcStrSetCreate();
  for (f = 0; f < fontset->nfont; f++)
  {
    assert(FcPatternGetString(fontset->fonts[f], FC_FONTFORMAT, 0, &format)
             == FcResultMatch);
    FcStrSetAdd(result, format);
  }

  return result;
}