mapnik/src/text/face.cpp
2017-09-13 10:14:46 +01:00

154 lines
4.3 KiB
C++

/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2017 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/text/face.hpp>
#include <mapnik/debug.hpp>
#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
extern "C"
{
#include FT_GLYPH_H
#include FT_TRUETYPE_TABLES_H
}
#pragma GCC diagnostic pop
namespace mapnik
{
font_face::font_face(FT_Face face)
: face_(face),
color_font_(init_color_font())
{
}
bool font_face::init_color_font()
{
static const uint32_t tag = FT_MAKE_TAG('C', 'B', 'D', 'T');
unsigned long length = 0;
FT_Load_Sfnt_Table(face_, tag, 0, nullptr, &length);
return length > 0;
}
bool font_face::set_character_sizes(double size)
{
return (FT_Set_Char_Size(face_, 0, static_cast<FT_F26Dot6>(size * (1 << 6)), 0, 0) == 0);
}
bool font_face::set_unscaled_character_sizes()
{
FT_F26Dot6 char_height = face_->units_per_EM > 0 ? face_->units_per_EM : 2048.0;
return (FT_Set_Char_Size(face_, 0, char_height, 0, 0) == 0);
}
bool font_face::glyph_dimensions(glyph_info & glyph) const
{
FT_Vector pen;
pen.x = 0;
pen.y = 0;
if (color_font_) FT_Select_Size(face_, 0);
FT_Set_Transform(face_, 0, &pen);
FT_Int32 load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING;
if (color_font_) load_flags |= FT_LOAD_COLOR ;
if (FT_Load_Glyph(face_, glyph.glyph_index, load_flags))
{
MAPNIK_LOG_ERROR(font_face) << "FT_Load_Glyph failed :( index=" << glyph.glyph_index << " " << load_flags
<< " " << face_->family_name << " " << face_->style_name ;
return false;
}
FT_Glyph image;
if (FT_Get_Glyph(face_->glyph, &image))
{
MAPNIK_LOG_ERROR(font_face) << "FT_Get_Glyph failed";
return false;
}
FT_BBox glyph_bbox;
FT_Glyph_Get_CBox(image, FT_GLYPH_BBOX_TRUNCATE, &glyph_bbox);
FT_Done_Glyph(image);
glyph.unscaled_ymin = glyph_bbox.yMin;
glyph.unscaled_ymax = glyph_bbox.yMax;
glyph.unscaled_advance = face_->glyph->advance.x;
glyph.unscaled_line_height = face_->size->metrics.height;
if (color_font_)
{
double scale_multiplier = 2048.0 / (face_->size->metrics.height);
glyph.unscaled_ymin *= scale_multiplier;
glyph.unscaled_ymax *= scale_multiplier;
glyph.unscaled_advance *= scale_multiplier;
}
return true;
}
font_face::~font_face()
{
MAPNIK_LOG_DEBUG(font_face) <<
"font_face: Clean up face \"" << family_name() <<
" " << style_name() << "\"";
FT_Done_Face(face_);
}
/******************************************************************************/
void font_face_set::add(face_ptr face)
{
faces_.push_back(face);
}
void font_face_set::set_character_sizes(double _size)
{
for (face_ptr const& face : faces_)
{
face->set_character_sizes(_size);
}
}
void font_face_set::set_unscaled_character_sizes()
{
for (face_ptr const& face : faces_)
{
face->set_unscaled_character_sizes();
}
}
/******************************************************************************/
void stroker::init(double radius)
{
FT_Stroker_Set(s_, static_cast<FT_Fixed>(radius * (1<<6)),
FT_STROKER_LINECAP_ROUND,
FT_STROKER_LINEJOIN_ROUND,
0);
}
stroker::~stroker()
{
MAPNIK_LOG_DEBUG(font_engine_freetype) << "stroker: Destroy stroker=" << s_;
FT_Stroker_Done(s_);
}
}//ns mapnik