C++字体库开发之freetype vs harfbuzz sfnt表，字体名称，可变轴八
FT_ULong tableCount = 0;
FT_Error error;
error = FT_Sfnt_Table_Info(face, 0, nullptr, &tableCount);
if (error)
return false;
for (FT_ULong tableIndex = 0; tableIndex < tableCount; ++tableIndex) {
FT_ULong tableTag;
FT_ULong tableLength;
error = FT_Sfnt_Table_Info(face, tableIndex, &tableTag, &tableLength);
if (error)
return false;
FontInfo::Table table{(uint32_t)tableTag, (uint32_t)tableLength};
m_fontInfo.tables.emplace_back(table);
}
字体名称const FT_UInt numNames = FT_Get_Sfnt_Name_Count(face);
FT_SfntName sfntName;
for (FT_UInt i = 0; i < numNames; ++i) {
if (FT_Get_Sfnt_Name(face, i, &sfntName))
continue;
auto name = sfntNameTranscodeUnicode(sfntName);
if (name.empty())
continue;
if (sfntName.name_id > TT_NAME_ID_VARIATIONS_PREFIX)
continue;
FontInfo::Encode encoding{sfntName.language_id, sfntName.platform_id, sfntName.encoding_id};
FontInfo::Name nameStu{name, encoding};
m_fontInfo.nameTables.at(sfntName.name_id).emplace_back(nameStu);
}
可变轴FT_CharMap *charMap = face->charmaps;
std::set<int> encodingSet;
for (int i = 0; i < face->num_charmaps; i++) {
auto cur = charMap[i];
if (encodingSet.count(cur->encoding))
continue;
encodingSet.insert(cur->encoding);
FT_Select_Charmap(face, cur->encoding);
unsigned short langID = FT_Get_CMap_Language_ID(cur);
auto weight = getWeight();
auto width = getWidth();
auto slant = getSlant();
auto variations = getSupportVariations();
FontInfo::Encode anEncode{langID, cur->platform_id, cur->encoding_id};
FontInfo::Axes axes{weight, width, slant, variations, anEncode};
m_fontInfo.axes.emplace_back(axes);
}
harfbuzz sfnt表unsigned int num_tags = 0;
hb_blob_t *blob;
num_tags = hb_face_get_table_tags(m_face, NULL, &num_tags, nullptr);
if (0 == num_tags)
return false;
hb_tag_t *tags = new hb_tag_t[num_tags];
hb_face_get_table_tags(m_face, NULL, &num_tags, tags);
for (unsigned int i = 0; i < num_tags; i++) {
blob = hb_face_reference_table(m_face, tags[i]);
auto tabLen = hb_blob_get_length(blob);
FontInfo::Table table{(uint32_t)tags[i], (uint32_t)tabLen};
m_fontInfo.tables.emplace_back(table);
}
delete[] tags;
字体名称const auto &allLanguages = FontLanguage::getAllLanguages();
std::map<unsigned short, hb_language_t> languages;
for (const auto &lang : allLanguages) {
languages.emplace(lang.first, hb_language_from_string(lang.second.code.c_str(), lang.second.code.size()));
}
char buf[1024] = {
0,
};
for (int i = HB_OT_NAME_ID_COPYRIGHT; i <= HB_OT_NAME_ID_VARIATIONS_PS_PREFIX; ++i) {
for (const auto &lang : languages) {
unsigned int size = 1024;
if (hb_ot_name_get_utf8(m_face, i, lang.second, &size, buf) > 0) {
FontInfo::Encode encoding{lang.first, 2, 0};
FontInfo::Name nameStu{buf, encoding};
m_fontInfo.nameTables.at(i).emplace_back(nameStu);
}
}
}
可变轴auto font = hb_font_create(m_face);
unsigned int length;
const int *coords = hb_font_get_var_coords_normalized(font, &length);
if (!coords)
return;
auto denorm_coord = [](hb_ot_var_axis_info_t *axis, int coord) -> float {
float r = coord / 16384.0;
if (coord < 0)
return axis->default_value + r * (axis->default_value - axis->min_value);
else
return axis->default_value + r * (axis->max_value - axis->default_value);
};
unsigned int n_axes;
hb_ot_var_axis_info_t *axes = new hb_ot_var_axis_info_t[length];
FONTVIEW_CLASS(ShareData<hb_ot_var_axis_info_t>) axisInfo(axes, length);
n_axes = length;
hb_ot_var_get_axis_infos(m_face, 0, &n_axes, axes);
auto weight = getWeight();
auto width = getWidth();
auto slant = getSlant();
FontInfo::Encode anEncode{2057, 2, 0};
for (unsigned int i = 0; i < length; ++i) {
char name[20];
unsigned int namelen = 20;
hb_ot_name_get_utf8(m_face, axes[i].name_id, hb_language_from_string("en", 2), &namelen, name);
FontVariation fontVariation(FontVariation::toUInt32((const char *)name));
fontVariation.cur = denorm_coord(&axes[i], coords[i]);
fontVariation.min = axes[i].min_value;
fontVariation.max = axes[i].max_value;
fontVariation.def = axes[i].default_value;
FontInfo::Axes axes{(size_t)weight, width, slant, {std::move(fontVariation)}, anEncode};
m_fontInfo.axes.emplace_back(axes);
}
hb_font_destroy(font);
参考C++字体库开发之字体列表设计七-CSDN博客
创作不易，小小的支持一下吧！
相关知识
SquareLine Studio 1.3.1 添加中文字体库并生成嵌入式点阵字体
Android 字体库的使用。引入外部字体
微软字体库下载，探索字体的世界
cad字体库大全2485种字体
字体库大全
移动应用中字体库的设计与实现
【花案图形字体和CAD字体库大全哪个好用】花案图形字体和CAD字体库大全对比－ZOL下载
word字体库
字体库管理
前端工程配置字体库
网址: C++字体库开发之freetype vs harfbuzz sfnt表，字体名称，可变轴八 https://m.huajiangbk.com/newsview742078.html
| 上一篇: 花体的编程字体是什么 |
下一篇: 前端开发项目中使用字体库 |
