74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
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/*
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Copyright (C) 2014 Paul Davis, Robin Gareus
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <algorithm>
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#include <gdk/gdk.h>
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#include <pangomm/layout.h>
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#include "gtkmm2ext/emscale.h"
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#include "i18n.h"
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using namespace Gtkmm2ext;
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std::map<std::string,EmScale> EmScale::_emscales;
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EmScale::EmScale (const Pango::FontDescription& fd)
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: _font (fd)
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, _char_pixel_width (-1)
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, _char_pixel_height (-1)
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, _char_avg_pixel_width (-1)
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{
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}
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void
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EmScale::recalc_char_pixel_geometry ()
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{
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if (_char_pixel_height > 0 && _char_pixel_width > 0) {
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return;
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}
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Glib::RefPtr<Pango::Context> pc = Glib::wrap (gdk_pango_context_get_for_screen (gdk_screen_get_default()));
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Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (pc);
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layout->set_font_description (_font);
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int w, h;
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std::string x = _("ABCDEFGHIJLKMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
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layout->set_text (x);
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layout->get_pixel_size (w, h);
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_char_pixel_height = std::max(4, h);
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// number of actual chars in the string (not bytes)
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// Glib to the rescue.
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Glib::ustring gx(x);
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_char_avg_pixel_width = w / (float)gx.size();
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_char_pixel_width = std::max(4, (int) ceil (_char_avg_pixel_width));
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}
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EmScale&
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EmScale::by_font (const Pango::FontDescription& fd)
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{
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std::map<std::string,EmScale>::iterator i = _emscales.find (fd.to_string());
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if (i == _emscales.end()) {
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i = _emscales.insert (std::make_pair (fd.to_string(), EmScale (fd))).first;
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}
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return i->second;
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}
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