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-rw-r--r--src/ui/widget/font-variations.cpp182
1 files changed, 182 insertions, 0 deletions
diff --git a/src/ui/widget/font-variations.cpp b/src/ui/widget/font-variations.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author:
+ * Felipe CorrĂȘa da Silva Sanches <juca@members.fsf.org>
+ * Tavmjong Bah <tavmjong@free.fr>
+ *
+ * Copyright (C) 2018 Felipe CorrĂȘa da Silva Sanches, Tavmong Bah
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <iostream>
+#include <iomanip>
+
+#include <gtkmm.h>
+#include <glibmm/i18n.h>
+
+#include <libnrtype/font-instance.h>
+
+#include "font-variations.h"
+
+// For updating from selection
+#include "desktop.h"
+#include "object/sp-text.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+FontVariationAxis::FontVariationAxis (Glib::ustring name, OTVarAxis& axis)
+ : name (name)
+{
+
+ // std::cout << "FontVariationAxis::FontVariationAxis:: "
+ // << " name: " << name
+ // << " min: " << axis.minimum
+ // << " def: " << axis.def
+ // << " max: " << axis.maximum
+ // << " val: " << axis.set_val << std::endl;
+
+ label = Gtk::manage( new Gtk::Label( name ) );
+ add( *label );
+
+ precision = 2 - int( log10(axis.maximum - axis.minimum));
+ if (precision < 0) precision = 0;
+
+ scale = Gtk::manage( new Gtk::Scale() );
+ scale->set_range (axis.minimum, axis.maximum);
+ scale->set_value (axis.set_val);
+ scale->set_digits (precision);
+ scale->set_hexpand(true);
+ add( *scale );
+
+ def = axis.def; // Default value
+}
+
+
+// ------------------------------------------------------------- //
+
+FontVariations::FontVariations () :
+ Gtk::Grid ()
+{
+ // std::cout << "FontVariations::FontVariations" << std::endl;
+ set_orientation( Gtk::ORIENTATION_VERTICAL );
+ set_name ("FontVariations");
+ size_group = Gtk::SizeGroup::create(Gtk::SIZE_GROUP_HORIZONTAL);
+ show_all_children();
+}
+
+
+// Update GUI based on query.
+void
+FontVariations::update (const Glib::ustring& font_spec) {
+
+ font_instance* res = font_factory::Default()->FaceFromFontSpecification (font_spec.c_str());
+
+ auto children = get_children();
+ for (auto child: children) {
+ remove ( *child );
+ }
+ axes.clear();
+
+ for (auto a: res->openTypeVarAxes) {
+ // std::cout << "Creating axis: " << a.first << std::endl;
+ FontVariationAxis* axis = Gtk::manage( new FontVariationAxis( a.first, a.second ));
+ axes.push_back( axis );
+ add( *axis );
+ size_group->add_widget( *(axis->get_label()) ); // Keep labels the same width
+ axis->get_scale()->signal_value_changed().connect(
+ sigc::mem_fun(*this, &FontVariations::on_variations_change)
+ );
+ }
+
+ show_all_children();
+}
+
+void
+FontVariations::fill_css( SPCSSAttr *css ) {
+
+ // Eventually will want to favor using 'font-weight', etc. but at the moment these
+ // can't handle "fractional" values. See CSS Fonts Module Level 4.
+ sp_repr_css_set_property(css, "font-variation-settings", get_css_string().c_str());
+}
+
+Glib::ustring
+FontVariations::get_css_string() {
+
+ Glib::ustring css_string;
+
+ for (auto axis: axes) {
+ Glib::ustring name = axis->get_name();
+
+ // Translate the "named" axes. (Additional names in 'stat' table, may need to handle them.)
+ if (name == "Width") name = "wdth"; // 'font-stretch'
+ if (name == "Weight") name = "wght"; // 'font-weight'
+ if (name == "OpticalSize") name = "opsz"; // 'font-optical-sizing' Can trigger glyph substitution.
+ if (name == "Slant") name = "slnt"; // 'font-style'
+ if (name == "Italic") name = "ital"; // 'font-style' Toggles from Roman to Italic.
+
+ std::stringstream value;
+ value << std::fixed << std::setprecision(axis->get_precision()) << axis->get_value();
+ css_string += "'" + name + "' " + value.str() + "', ";
+ }
+
+ return css_string;
+}
+
+Glib::ustring
+FontVariations::get_pango_string() {
+
+ Glib::ustring pango_string;
+
+ if (!axes.empty()) {
+
+ pango_string += "@";
+
+ for (auto axis: axes) {
+ if (axis->get_value() == axis->get_def()) continue;
+ Glib::ustring name = axis->get_name();
+
+ // Translate the "named" axes. (Additional names in 'stat' table, may need to handle them.)
+ if (name == "Width") name = "wdth"; // 'font-stretch'
+ if (name == "Weight") name = "wght"; // 'font-weight'
+ if (name == "OpticalSize") name = "opsz"; // 'font-optical-sizing' Can trigger glyph substitution.
+ if (name == "Slant") name = "slnt"; // 'font-style'
+ if (name == "Italic") name = "ital"; // 'font-style' Toggles from Roman to Italic.
+
+ std::stringstream value;
+ value << std::fixed << std::setprecision(axis->get_precision()) << axis->get_value();
+ pango_string += name + "=" + value.str() + ",";
+ }
+
+ pango_string.erase (pango_string.size() - 1); // Erase last ',' or '@'
+ }
+
+ return pango_string;
+}
+
+void
+FontVariations::on_variations_change() {
+ // std::cout << "FontVariations::on_variations_change: " << get_css_string() << std::endl;;
+ signal_changed.emit ();
+}
+
+bool FontVariations::variations_present() const {
+ return !axes.empty();
+}
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+/*
+ 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:fileencoding=utf-8 :