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/* libs/graphics/ports/SkFontHost_fontconfig_direct.cpp
**
** Copyright 2009, Google Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "SkFontHost_fontconfig_direct.h"
#include <unistd.h>
#include <fcntl.h>
#include <fontconfig/fontconfig.h>
FontConfigDirect::FontConfigDirect()
: next_file_id_(0) {
FcInit();
}
// -----------------------------------------------------------------------------
// Normally we only return exactly the font asked for. In last-resort cases,
// the request is for one of the basic font names "Sans", "Serif" or
// "Monospace". This function tells you whether a given request is for such a
// fallback.
// -----------------------------------------------------------------------------
static bool IsFallbackFontAllowed(const std::string& family)
{
return family == "Sans" ||
family == "Serif" ||
family == "Monospace";
}
bool FontConfigDirect::Match(std::string* result_family,
unsigned* result_fileid,
bool fileid_valid, unsigned fileid,
const std::string& family, int is_bold,
int is_italic) {
SkAutoMutexAcquire ac(mutex_);
FcPattern* pattern = FcPatternCreate();
FcValue fcvalue;
if (fileid_valid) {
const std::map<unsigned, std::string>::const_iterator
i = fileid_to_filename_.find(fileid);
if (i == fileid_to_filename_.end()) {
FcPatternDestroy(pattern);
return false;
}
fcvalue.type = FcTypeString;
fcvalue.u.s = (FcChar8*) i->second.c_str();
FcPatternAdd(pattern, FC_FILE, fcvalue, 0);
}
if (!family.empty()) {
fcvalue.type = FcTypeString;
fcvalue.u.s = (FcChar8*) family.c_str();
FcPatternAdd(pattern, FC_FAMILY, fcvalue, 0);
}
if (is_bold > 0) {
fcvalue.type = FcTypeInteger;
fcvalue.u.i = is_bold ? FC_WEIGHT_BOLD : FC_WEIGHT_NORMAL;
FcPatternAdd(pattern, FC_WEIGHT, fcvalue, 0);
}
if (is_italic > 0) {
fcvalue.type = FcTypeInteger;
fcvalue.u.i = is_italic ? FC_SLANT_ITALIC : FC_SLANT_ROMAN;
FcPatternAdd(pattern, FC_SLANT, fcvalue, 0);
}
FcConfigSubstitute(0, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
// Font matching:
// CSS often specifies a fallback list of families:
// font-family: a, b, c, serif;
// However, fontconfig will always do its best to find *a* font when asked
// for something so we need a way to tell if the match which it has found is
// "good enough" for us. Otherwise, we can return NULL which gets piped up
// and lets WebKit know to try the next CSS family name. However, fontconfig
// configs allow substitutions (mapping "Arial -> Helvetica" etc) and we
// wish to support that.
//
// Thus, if a specific family is requested we set @family_requested. Then we
// record two strings: the family name after config processing and the
// family name after resolving. If the two are equal, it's a good match.
//
// So consider the case where a user has mapped Arial to Helvetica in their
// config.
// requested family: "Arial"
// post_config_family: "Helvetica"
// post_match_family: "Helvetica"
// -> good match
//
// and for a missing font:
// requested family: "Monaco"
// post_config_family: "Monaco"
// post_match_family: "Times New Roman"
// -> BAD match
//
// However, we special-case fallback fonts; see IsFallbackFontAllowed().
FcChar8* post_config_family;
FcPatternGetString(pattern, FC_FAMILY, 0, &post_config_family);
FcResult result;
FcPattern* match = FcFontMatch(0, pattern, &result);
if (!match) {
FcPatternDestroy(pattern);
return false;
}
FcChar8* post_match_family;
FcPatternGetString(match, FC_FAMILY, 0, &post_match_family);
const bool family_names_match =
family.empty() ?
true :
strcasecmp((char *)post_config_family, (char *)post_match_family) == 0;
FcPatternDestroy(pattern);
if (!family_names_match && !IsFallbackFontAllowed(family)) {
FcPatternDestroy(match);
return false;
}
FcChar8* c_filename;
if (FcPatternGetString(match, FC_FILE, 0, &c_filename) != FcResultMatch) {
FcPatternDestroy(match);
return NULL;
}
const std::string filename((char *) c_filename);
unsigned out_fileid;
if (fileid_valid) {
out_fileid = fileid;
} else {
const std::map<std::string, unsigned>::const_iterator
i = filename_to_fileid_.find(filename);
if (i == filename_to_fileid_.end()) {
out_fileid = next_file_id_++;
filename_to_fileid_[filename] = out_fileid;
fileid_to_filename_[out_fileid] = filename;
} else {
out_fileid = i->second;
}
}
if (*result_fileid)
*result_fileid = out_fileid;
FcChar8* c_family;
if (FcPatternGetString(match, FC_FAMILY, 0, &c_family)) {
FcPatternDestroy(match);
return NULL;
}
if (result_family)
*result_family = (char *) c_family;
return true;
}
int FontConfigDirect::Open(unsigned fileid) {
SkAutoMutexAcquire ac(mutex_);
const std::map<unsigned, std::string>::const_iterator
i = fileid_to_filename_.find(fileid);
if (i == fileid_to_filename_.end())
return -1;
return open(i->second.c_str(), O_RDONLY);
}
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