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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 <i18nlangtag/languagetag.hxx>
#include <font/OpenTypeFeatureStrings.hrc>
#include <svdata.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_rLanguageTag.getLanguageType());
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(nFeatureCode, vcl::font::FeatureType::Graphite);
vcl::font::Feature& rFeature = m_rFontFeatures.back();
rFeature.m_aDefinition
= vcl::font::FeatureDefinition(nFeatureCode, sLabel, eFeatureParameterType,
std::move(aParameters), int32_t(nValue));
}
}
gr_featureval_destroy(pfeatureValues);
return true;
}
void FeatureCollector::collectForTable(hb_tag_t aTableTag)
{
unsigned int nFeatureCount
= hb_ot_layout_table_get_feature_tags(m_pHbFace, aTableTag, 0, nullptr, nullptr);
std::vector<hb_tag_t> aFeatureTags(nFeatureCount);
hb_ot_layout_table_get_feature_tags(m_pHbFace, aTableTag, 0, &nFeatureCount,
aFeatureTags.data());
aFeatureTags.resize(nFeatureCount);
for (hb_tag_t aFeatureTag : aFeatureTags)
{
if (OpenTypeFeatureDefinitionList().isRequired(aFeatureTag))
continue;
m_rFontFeatures.emplace_back();
vcl::font::Feature& rFeature = m_rFontFeatures.back();
rFeature.m_nCode = aFeatureTag;
FeatureDefinition aDefinition = OpenTypeFeatureDefinitionList().getDefinition(rFeature);
std::vector<vcl::font::FeatureParameter> aParameters{
{ 0, VclResId(STR_FONT_FEATURE_PARAM_NONE) }
};
unsigned int nFeatureIdx;
if (hb_ot_layout_language_find_feature(m_pHbFace, aTableTag, 0,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX, aFeatureTag,
&nFeatureIdx))
{
// ssXX and cvXX can have name ID defined for them, check for
// them and use as appropriate.
hb_ot_name_id_t aLabelID;
hb_ot_name_id_t aFirstParameterID;
unsigned nNamedParameters;
if (hb_ot_layout_feature_get_name_ids(m_pHbFace, aTableTag, nFeatureIdx, &aLabelID,
nullptr, nullptr, &nNamedParameters,
&aFirstParameterID))
{
OUString sLabel = m_pFace->GetName(NameID(aLabelID), m_rLanguageTag);
if (!sLabel.isEmpty())
aDefinition = vcl::font::FeatureDefinition(aFeatureTag, sLabel);
// cvXX features can have parameters name IDs, check for
// them and populate feature parameters as appropriate.
for (unsigned i = 0; i < nNamedParameters; i++)
{
hb_ot_name_id_t aNameID = aFirstParameterID + i;
OUString sName = m_pFace->GetName(NameID(aNameID), m_rLanguageTag);
if (!sName.isEmpty())
aParameters.emplace_back(uint32_t(i + 1), sName);
else
aParameters.emplace_back(uint32_t(i + 1), OUString::number(i + 1));
}
}
unsigned int nAlternates = 0;
if (aTableTag == HB_OT_TAG_GSUB)
{
// Collect lookups in this feature, and input glyphs for each
// lookup, and calculate the max number of alternates they have.
unsigned int nLookups = hb_ot_layout_feature_get_lookups(
m_pHbFace, aTableTag, nFeatureIdx, 0, nullptr, nullptr);
std::vector<unsigned int> aLookups(nLookups);
hb_ot_layout_feature_get_lookups(m_pHbFace, aTableTag, nFeatureIdx, 0, &nLookups,
aLookups.data());
hb_set_t* pGlyphs = hb_set_create();
for (unsigned int nLookupIdx : aLookups)
{
hb_set_clear(pGlyphs);
hb_ot_layout_lookup_collect_glyphs(m_pHbFace, aTableTag, nLookupIdx, nullptr,
pGlyphs, nullptr, nullptr);
hb_codepoint_t nGlyphIdx = HB_SET_VALUE_INVALID;
while (hb_set_next(pGlyphs, &nGlyphIdx))
{
nAlternates
= std::max(nAlternates,
hb_ot_layout_lookup_get_glyph_alternates(
m_pHbFace, nLookupIdx, nGlyphIdx, 0, nullptr, nullptr));
}
}
hb_set_destroy(pGlyphs);
}
// Append the alternates to the feature parameters, keeping any
// existing ones calculated from cvXX features above.
for (unsigned int i = aParameters.size() - 1; i < nAlternates; i++)
aParameters.emplace_back(uint32_t(i + 1), OUString::number(i + 1));
if (aParameters.size() > 1)
{
aDefinition = vcl::font::FeatureDefinition(
aFeatureTag, aDefinition.getDescription(),
vcl::font::FeatureParameterType::ENUM, std::move(aParameters), 0);
}
}
if (aDefinition)
rFeature.m_aDefinition = aDefinition;
}
}
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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