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// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* TODO: insert short description here
*//*
* Authors: see git history
*
* Copyright (C) 2018 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef SEEN_OPENTYPEUTIL_H
#define SEEN_OPENTYPEUTIL_H
#ifndef USE_PANGO_WIN32
#include <map>
#include <memory>
#include <ft2build.h>
#include FT_FREETYPE_H
#include <glibmm/ustring.h>
/*
* A set of utilities to extract data from OpenType fonts.
*
* Isolates dependencies on FreeType, Harfbuzz, and Pango.
* All three provide variable amounts of access to data.
*/
struct hb_font_t;
// OpenType substitution
class OTSubstitution {
public:
OTSubstitution() = default;;
Glib::ustring before;
Glib::ustring input;
Glib::ustring after;
Glib::ustring output;
};
// An OpenType fvar axis.
class OTVarAxis {
public:
OTVarAxis()
: minimum(0)
, def(500) // Default
, maximum(1000)
, set_val(500)
, index(-1) {};
OTVarAxis(double _minimum, double _def, double _maximum, double _set_val, int _index)
: minimum(_minimum)
, def(_def) // Default
, maximum(_maximum)
, set_val(_set_val)
, index (_index) {};
double minimum;
double def;
double maximum;
double set_val;
int index; // Index in OpenType file (since we use a map).
};
// A particular instance of a variable font.
// A map indexed by axis name with value.
class OTVarInstance {
std::map<Glib::ustring, double> axes;
};
inline double FTFixedToDouble (FT_Fixed value) {
return static_cast<FT_Int32>(value) / 65536.0;
}
inline FT_Fixed FTDoubleToFixed (double value) {
return static_cast<FT_Fixed>(value * 65536);
}
namespace Inkscape { class Pixbuf; }
struct SVGTableEntry
{
std::string svg;
std::unique_ptr<Inkscape::Pixbuf const> pixbuf;
~SVGTableEntry();
};
// This would be better if one had std::vector<OTSubstitution> instead of OTSubstitution where each
// entry corresponded to one substitution (e.g. ff -> ff) but Harfbuzz at the moment cannot return
// individual substitutions. See Harfbuzz issue #673.
void readOpenTypeGsubTable (hb_font_t* hb_font,
std::map<Glib::ustring, OTSubstitution >& tables);
void readOpenTypeFvarAxes (const FT_Face ft_face,
std::map<Glib::ustring, OTVarAxis>& axes);
void readOpenTypeFvarNamed (const FT_Face ft_face,
std::map<Glib::ustring, OTVarInstance>& named);
void readOpenTypeSVGTable (hb_font_t* hb_font,
std::map<int, SVGTableEntry>& glyphs);
#endif /* !USE_PANGO_WIND32 */
#endif /* !SEEN_OPENTYPEUTIL_H */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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