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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <font/FeatureCollector.hxx>
#include <font/OpenTypeFeatureDefinitionList.hxx>
#include <hb-ot.h>
#include <hb-graphite2.h>
namespace vcl::font
{
bool FeatureCollector::collectGraphite()
{
gr_face* grFace = hb_graphite2_face_get_gr_face(m_pHbFace);
if (grFace == nullptr)
return false;
gr_uint16 nUILanguage = gr_uint16(m_eLanguageType);
gr_uint16 nNumberOfFeatures = gr_face_n_fref(grFace);
gr_feature_val* pfeatureValues
= gr_face_featureval_for_lang(grFace, 0); // shame we don't know which lang
for (gr_uint16 i = 0; i < nNumberOfFeatures; ++i)
{
const gr_feature_ref* pFeatureRef = gr_face_fref(grFace, i);
gr_uint32 nFeatureCode = gr_fref_id(pFeatureRef);
if (nFeatureCode == 0) // illegal feature code - skip
continue;
gr_uint16 nValue = gr_fref_feature_value(pFeatureRef, pfeatureValues);
gr_uint32 nLabelLength = 0;
void* pLabel = gr_fref_label(pFeatureRef, &nUILanguage, gr_utf8, &nLabelLength);
OUString sLabel(OUString::createFromAscii(static_cast<char*>(pLabel)));
gr_label_destroy(pLabel);
std::vector<vcl::font::FeatureParameter> aParameters;
gr_uint16 nNumberOfValues = gr_fref_n_values(pFeatureRef);
if (nNumberOfValues > 0)
{
for (gr_uint16 j = 0; j < nNumberOfValues; ++j)
{
gr_uint32 nValueLabelLength = 0;
void* pValueLabel = gr_fref_value_label(pFeatureRef, j, &nUILanguage, gr_utf8,
&nValueLabelLength);
OUString sValueLabel(OUString::createFromAscii(static_cast<char*>(pValueLabel)));
gr_uint16 nParamValue = gr_fref_value(pFeatureRef, j);
aParameters.emplace_back(sal_uInt32(nParamValue), sValueLabel);
gr_label_destroy(pValueLabel);
}
auto eFeatureParameterType = vcl::font::FeatureParameterType::ENUM;
// Check if the parameters are boolean
if (aParameters.size() == 2
&& (aParameters[0].getDescription() == "True"
|| aParameters[0].getDescription() == "False"))
{
eFeatureParameterType = vcl::font::FeatureParameterType::BOOL;
aParameters.clear();
}
m_rFontFeatures.emplace_back(
FeatureID{ nFeatureCode, HB_OT_TAG_DEFAULT_SCRIPT, HB_OT_TAG_DEFAULT_LANGUAGE },
vcl::font::FeatureType::Graphite);
vcl::font::Feature& rFeature = m_rFontFeatures.back();
rFeature.m_aDefinition = vcl::font::FeatureDefinition(
nFeatureCode, sLabel, eFeatureParameterType, aParameters, sal_uInt32(nValue));
}
}
gr_featureval_destroy(pfeatureValues);
return true;
}
void FeatureCollector::collectForLanguage(hb_tag_t aTableTag, sal_uInt32 nScript,
hb_tag_t aScriptTag, sal_uInt32 nLanguage,
hb_tag_t aLanguageTag)
{
unsigned int nFeatureCount = hb_ot_layout_language_get_feature_tags(
m_pHbFace, aTableTag, nScript, nLanguage, 0, nullptr, nullptr);
std::vector<hb_tag_t> aFeatureTags(nFeatureCount);
hb_ot_layout_language_get_feature_tags(m_pHbFace, aTableTag, nScript, nLanguage, 0,
&nFeatureCount, aFeatureTags.data());
aFeatureTags.resize(nFeatureCount);
for (hb_tag_t aFeatureTag : aFeatureTags)
{
if (OpenTypeFeatureDefinitionList::get().isRequired(aFeatureTag))
continue;
m_rFontFeatures.emplace_back();
vcl::font::Feature& rFeature = m_rFontFeatures.back();
rFeature.m_aID = { aFeatureTag, aScriptTag, aLanguageTag };
FeatureDefinition aDefinition
= OpenTypeFeatureDefinitionList::get().getDefinition(aFeatureTag);
if (aDefinition)
{
rFeature.m_aDefinition = aDefinition;
}
}
}
void FeatureCollector::collectForScript(hb_tag_t aTableTag, sal_uInt32 nScript, hb_tag_t aScriptTag)
{
collectForLanguage(aTableTag, nScript, aScriptTag, HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
HB_OT_TAG_DEFAULT_LANGUAGE);
unsigned int nLanguageCount
= hb_ot_layout_script_get_language_tags(m_pHbFace, aTableTag, nScript, 0, nullptr, nullptr);
std::vector<hb_tag_t> aLanguageTags(nLanguageCount);
hb_ot_layout_script_get_language_tags(m_pHbFace, aTableTag, nScript, 0, &nLanguageCount,
aLanguageTags.data());
aLanguageTags.resize(nLanguageCount);
for (sal_uInt32 nLanguage = 0; nLanguage < sal_uInt32(nLanguageCount); ++nLanguage)
collectForLanguage(aTableTag, nScript, aScriptTag, nLanguage, aLanguageTags[nLanguage]);
}
void FeatureCollector::collectForTable(hb_tag_t aTableTag)
{
unsigned int nScriptCount
= hb_ot_layout_table_get_script_tags(m_pHbFace, aTableTag, 0, nullptr, nullptr);
std::vector<hb_tag_t> aScriptTags(nScriptCount);
hb_ot_layout_table_get_script_tags(m_pHbFace, aTableTag, 0, &nScriptCount, aScriptTags.data());
aScriptTags.resize(nScriptCount);
for (sal_uInt32 nScript = 0; nScript < sal_uInt32(nScriptCount); ++nScript)
collectForScript(aTableTag, nScript, aScriptTags[nScript]);
}
bool FeatureCollector::collect()
{
gr_face* grFace = hb_graphite2_face_get_gr_face(m_pHbFace);
if (grFace)
{
return collectGraphite();
}
else
{
collectForTable(HB_OT_TAG_GSUB); // substitution
collectForTable(HB_OT_TAG_GPOS); // positioning
return true;
}
}
} // end namespace vcl::font
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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