154 lines
4.3 KiB
C++
154 lines
4.3 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2017 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/text/face.hpp>
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#include <mapnik/debug.hpp>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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extern "C"
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{
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#include FT_GLYPH_H
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#include FT_TRUETYPE_TABLES_H
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}
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#pragma GCC diagnostic pop
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namespace mapnik
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{
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font_face::font_face(FT_Face face)
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: face_(face),
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color_font_(init_color_font())
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{
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}
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bool font_face::init_color_font()
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{
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static const uint32_t tag = FT_MAKE_TAG('C', 'B', 'D', 'T');
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unsigned long length = 0;
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FT_Load_Sfnt_Table(face_, tag, 0, nullptr, &length);
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return length > 0;
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}
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bool font_face::set_character_sizes(double size)
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{
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return (FT_Set_Char_Size(face_, 0, static_cast<FT_F26Dot6>(size * (1 << 6)), 0, 0) == 0);
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}
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bool font_face::set_unscaled_character_sizes()
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{
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FT_F26Dot6 char_height = face_->units_per_EM > 0 ? face_->units_per_EM : 2048.0;
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return (FT_Set_Char_Size(face_, 0, char_height, 0, 0) == 0);
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}
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bool font_face::glyph_dimensions(glyph_info & glyph) const
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{
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FT_Vector pen;
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pen.x = 0;
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pen.y = 0;
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if (color_font_) FT_Select_Size(face_, 0);
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FT_Set_Transform(face_, 0, &pen);
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FT_Int32 load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING;
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if (color_font_) load_flags |= FT_LOAD_COLOR ;
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if (FT_Load_Glyph(face_, glyph.glyph_index, load_flags))
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{
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MAPNIK_LOG_ERROR(font_face) << "FT_Load_Glyph failed :( index=" << glyph.glyph_index << " " << load_flags
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<< " " << face_->family_name << " " << face_->style_name ;
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return false;
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}
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FT_Glyph image;
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if (FT_Get_Glyph(face_->glyph, &image))
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{
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MAPNIK_LOG_ERROR(font_face) << "FT_Get_Glyph failed";
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return false;
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}
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FT_BBox glyph_bbox;
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FT_Glyph_Get_CBox(image, FT_GLYPH_BBOX_TRUNCATE, &glyph_bbox);
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FT_Done_Glyph(image);
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glyph.unscaled_ymin = glyph_bbox.yMin;
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glyph.unscaled_ymax = glyph_bbox.yMax;
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glyph.unscaled_advance = face_->glyph->advance.x;
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glyph.unscaled_line_height = face_->size->metrics.height;
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if (color_font_)
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{
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double scale_multiplier = 2048.0 / (face_->size->metrics.height);
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glyph.unscaled_ymin *= scale_multiplier;
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glyph.unscaled_ymax *= scale_multiplier;
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glyph.unscaled_advance *= scale_multiplier;
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}
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return true;
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}
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font_face::~font_face()
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{
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MAPNIK_LOG_DEBUG(font_face) <<
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"font_face: Clean up face \"" << family_name() <<
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" " << style_name() << "\"";
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FT_Done_Face(face_);
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}
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/******************************************************************************/
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void font_face_set::add(face_ptr face)
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{
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faces_.push_back(face);
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}
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void font_face_set::set_character_sizes(double _size)
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{
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for (face_ptr const& face : faces_)
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{
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face->set_character_sizes(_size);
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}
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}
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void font_face_set::set_unscaled_character_sizes()
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{
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for (face_ptr const& face : faces_)
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{
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face->set_unscaled_character_sizes();
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}
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}
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/******************************************************************************/
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void stroker::init(double radius)
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{
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FT_Stroker_Set(s_, static_cast<FT_Fixed>(radius * (1<<6)),
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FT_STROKER_LINECAP_ROUND,
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FT_STROKER_LINEJOIN_ROUND,
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0);
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}
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stroker::~stroker()
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{
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MAPNIK_LOG_DEBUG(font_engine_freetype) << "stroker: Destroy stroker=" << s_;
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FT_Stroker_Done(s_);
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}
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}//ns mapnik
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