| 1 | /***************************************************************************** |
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| 2 | * |
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| 3 | * This file is part of Mapnik (c++ mapping toolkit) |
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| 4 | * |
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| 5 | * Copyright (C) 2006 Artem Pavlenko |
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| 6 | * |
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| 7 | * This library is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * This library is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with this library; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | * |
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| 21 | *****************************************************************************/ |
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| 22 | |
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| 23 | //$Id$ |
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| 24 | |
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| 25 | #ifndef FONT_ENGINE_FREETYPE_HPP |
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| 26 | #define FONT_ENGINE_FREETYPE_HPP |
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| 27 | // mapnik |
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| 28 | #include <mapnik/color.hpp> |
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| 29 | #include <mapnik/utils.hpp> |
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| 30 | #include <mapnik/ctrans.hpp> |
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| 31 | #include <mapnik/geometry.hpp> |
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| 32 | #include <mapnik/text_path.hpp> |
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| 33 | #include <mapnik/font_set.hpp> |
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| 34 | |
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| 35 | // freetype2 |
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| 36 | extern "C" |
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| 37 | { |
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| 38 | #include <ft2build.h> |
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| 39 | #include FT_FREETYPE_H |
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| 40 | #include FT_GLYPH_H |
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| 41 | } |
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| 42 | |
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| 43 | // boost |
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| 44 | #include <boost/shared_ptr.hpp> |
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| 45 | #include <boost/utility.hpp> |
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| 46 | #include <boost/ptr_container/ptr_vector.hpp> |
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| 47 | #include <boost/thread/mutex.hpp> |
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| 48 | |
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| 49 | // stl |
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| 50 | #include <string> |
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| 51 | #include <vector> |
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| 52 | #include <map> |
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| 53 | #include <iostream> |
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| 54 | |
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| 55 | // icu |
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| 56 | #include <unicode/ubidi.h> |
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| 57 | #include <unicode/ushape.h> |
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| 58 | |
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| 59 | namespace mapnik |
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| 60 | { |
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| 61 | class font_face; |
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| 62 | |
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| 63 | typedef boost::shared_ptr<font_face> face_ptr; |
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| 64 | |
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| 65 | class MAPNIK_DECL font_glyph : private boost::noncopyable |
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| 66 | { |
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| 67 | public: |
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| 68 | font_glyph(face_ptr face, unsigned index) |
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| 69 | : face_(face), index_(index) {} |
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| 70 | |
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| 71 | face_ptr get_face() const |
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| 72 | { |
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| 73 | return face_; |
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| 74 | } |
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| 75 | |
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| 76 | unsigned get_index() const |
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| 77 | { |
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| 78 | return index_; |
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| 79 | } |
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| 80 | private: |
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| 81 | face_ptr face_; |
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| 82 | unsigned index_; |
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| 83 | }; |
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| 84 | |
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| 85 | typedef boost::shared_ptr<font_glyph> glyph_ptr; |
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| 86 | |
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| 87 | class font_face : boost::noncopyable |
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| 88 | { |
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| 89 | public: |
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| 90 | font_face(FT_Face face) |
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| 91 | : face_(face) {} |
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| 92 | |
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| 93 | std::string family_name() const |
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| 94 | { |
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| 95 | return std::string(face_->family_name); |
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| 96 | } |
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| 97 | |
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| 98 | std::string style_name() const |
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| 99 | { |
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| 100 | return std::string(face_->style_name); |
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| 101 | } |
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| 102 | |
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| 103 | FT_GlyphSlot glyph() const |
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| 104 | { |
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| 105 | return face_->glyph; |
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| 106 | } |
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| 107 | |
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| 108 | FT_Face get_face() const |
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| 109 | { |
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| 110 | return face_; |
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| 111 | } |
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| 112 | |
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| 113 | unsigned get_char(unsigned c) const |
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| 114 | { |
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| 115 | return FT_Get_Char_Index(face_, c); |
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| 116 | } |
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| 117 | |
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| 118 | bool set_pixel_sizes(unsigned size) |
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| 119 | { |
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| 120 | if (! FT_Set_Pixel_Sizes( face_, 0, size )) |
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| 121 | return true; |
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| 122 | |
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| 123 | return false; |
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| 124 | } |
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| 125 | |
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| 126 | ~font_face() |
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| 127 | { |
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| 128 | #ifdef MAPNIK_DEBUG |
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| 129 | std::clog << "~font_face: Clean up face \"" << family_name() |
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| 130 | << " " << style_name() << "\"" << std::endl; |
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| 131 | #endif |
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| 132 | FT_Done_Face(face_); |
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| 133 | } |
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| 134 | |
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| 135 | private: |
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| 136 | FT_Face face_; |
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| 137 | }; |
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| 138 | |
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| 139 | class MAPNIK_DECL font_face_set : private boost::noncopyable |
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| 140 | { |
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| 141 | public: |
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| 142 | typedef std::pair<unsigned,unsigned> dimension_t; |
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| 143 | |
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| 144 | font_face_set(void) |
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| 145 | : faces_() {} |
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| 146 | |
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| 147 | void add(face_ptr face) |
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| 148 | { |
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| 149 | faces_.push_back(face); |
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| 150 | } |
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| 151 | |
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| 152 | unsigned size() const |
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| 153 | { |
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| 154 | return faces_.size(); |
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| 155 | } |
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| 156 | |
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| 157 | glyph_ptr get_glyph(unsigned c) const |
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| 158 | { |
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| 159 | for (std::vector<face_ptr>::const_iterator face = faces_.begin(); face != faces_.end(); ++face) |
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| 160 | { |
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| 161 | FT_UInt g = (*face)->get_char(c); |
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| 162 | |
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| 163 | if (g) return glyph_ptr(new font_glyph(*face, g)); |
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| 164 | } |
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| 165 | |
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| 166 | // Final fallback to empty square if nothing better in any font |
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| 167 | return glyph_ptr(new font_glyph(*faces_.begin(), 0)); |
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| 168 | } |
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| 169 | |
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| 170 | dimension_t character_dimensions(const unsigned c) |
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| 171 | { |
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| 172 | FT_Matrix matrix; |
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| 173 | FT_Vector pen; |
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| 174 | FT_Error error; |
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| 175 | |
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| 176 | pen.x = 0; |
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| 177 | pen.y = 0; |
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| 178 | |
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| 179 | FT_BBox glyph_bbox; |
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| 180 | FT_Glyph image; |
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| 181 | |
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| 182 | glyph_ptr glyph = get_glyph(c); |
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| 183 | FT_Face face = glyph->get_face()->get_face(); |
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| 184 | |
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| 185 | matrix.xx = (FT_Fixed)( 1 * 0x10000L ); |
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| 186 | matrix.xy = (FT_Fixed)( 0 * 0x10000L ); |
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| 187 | matrix.yx = (FT_Fixed)( 0 * 0x10000L ); |
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| 188 | matrix.yy = (FT_Fixed)( 1 * 0x10000L ); |
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| 189 | |
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| 190 | FT_Set_Transform(face, &matrix, &pen); |
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| 191 | |
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| 192 | error = FT_Load_Glyph (face, glyph->get_index(), FT_LOAD_NO_HINTING); |
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| 193 | if ( error ) |
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| 194 | return dimension_t(0, 0); |
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| 195 | |
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| 196 | error = FT_Get_Glyph(face->glyph, &image); |
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| 197 | if ( error ) |
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| 198 | return dimension_t(0, 0); |
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| 199 | |
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| 200 | FT_Glyph_Get_CBox(image, ft_glyph_bbox_pixels, &glyph_bbox); |
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| 201 | FT_Done_Glyph(image); |
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| 202 | |
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| 203 | unsigned tempx = face->glyph->advance.x >> 6; |
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| 204 | unsigned tempy = glyph_bbox.yMax - glyph_bbox.yMin; |
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| 205 | |
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| 206 | //std::clog << "glyph: " << glyph_index << " x: " << tempx << " y: " << tempy << std::endl; |
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| 207 | |
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| 208 | return dimension_t(tempx, tempy); |
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| 209 | } |
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| 210 | |
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| 211 | void get_string_info(string_info & info) |
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| 212 | { |
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| 213 | unsigned width = 0; |
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| 214 | unsigned height = 0; |
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| 215 | UErrorCode err = U_ZERO_ERROR; |
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| 216 | UnicodeString const& ustr = info.get_string(); |
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| 217 | const UChar * text = ustr.getBuffer(); |
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| 218 | UBiDi * bidi = ubidi_openSized(ustr.length(),0,&err); |
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| 219 | |
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| 220 | if (U_SUCCESS(err)) |
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| 221 | { |
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| 222 | ubidi_setPara(bidi,text,ustr.length(), UBIDI_DEFAULT_LTR,0,&err); |
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| 223 | |
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| 224 | if (U_SUCCESS(err)) |
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| 225 | { |
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| 226 | int32_t count = ubidi_countRuns(bidi,&err); |
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| 227 | int32_t logicalStart; |
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| 228 | int32_t length; |
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| 229 | |
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| 230 | for (int32_t i=0; i< count;++i) |
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| 231 | { |
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| 232 | if (UBIDI_LTR == ubidi_getVisualRun(bidi,i,&logicalStart,&length)) |
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| 233 | { |
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| 234 | do { |
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| 235 | UChar ch = text[logicalStart++]; |
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| 236 | dimension_t char_dim = character_dimensions(ch); |
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| 237 | info.add_info(ch, char_dim.first, char_dim.second); |
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| 238 | width += char_dim.first; |
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| 239 | height = char_dim.second > height ? char_dim.second : height; |
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| 240 | |
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| 241 | } while (--length > 0); |
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| 242 | } |
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| 243 | else |
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| 244 | { |
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| 245 | logicalStart += length; |
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| 246 | |
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| 247 | int32_t j=0,i=length; |
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| 248 | UnicodeString arabic; |
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| 249 | UChar * buf = arabic.getBuffer(length); |
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| 250 | do { |
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| 251 | UChar ch = text[--logicalStart]; |
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| 252 | buf[j++] = ch; |
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| 253 | } while (--i > 0); |
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| 254 | |
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| 255 | arabic.releaseBuffer(length); |
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| 256 | if ( *arabic.getBuffer() >= 0x0600 && *arabic.getBuffer() <= 0x06ff) |
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| 257 | { |
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| 258 | UnicodeString shaped; |
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| 259 | u_shapeArabic(arabic.getBuffer(),arabic.length(),shaped.getBuffer(arabic.length()),arabic.length(), |
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| 260 | U_SHAPE_LETTERS_SHAPE|U_SHAPE_LENGTH_FIXED_SPACES_NEAR| |
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| 261 | U_SHAPE_TEXT_DIRECTION_VISUAL_LTR |
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| 262 | ,&err); |
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| 263 | |
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| 264 | shaped.releaseBuffer(arabic.length()); |
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| 265 | |
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| 266 | if (U_SUCCESS(err)) |
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| 267 | { |
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| 268 | for (int j=0;j<shaped.length();++j) |
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| 269 | { |
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| 270 | dimension_t char_dim = character_dimensions(shaped[j]); |
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| 271 | info.add_info(shaped[j], char_dim.first, char_dim.second); |
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| 272 | width += char_dim.first; |
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| 273 | height = char_dim.second > height ? char_dim.second : height; |
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| 274 | } |
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| 275 | } |
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| 276 | } else { |
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| 277 | // Non-Arabic RTL |
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| 278 | for (int j=0;j<arabic.length();++j) |
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| 279 | { |
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| 280 | dimension_t char_dim = character_dimensions(arabic[j]); |
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| 281 | info.add_info(arabic[j], char_dim.first, char_dim.second); |
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| 282 | width += char_dim.first; |
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| 283 | height = char_dim.second > height ? char_dim.second : height; |
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| 284 | } |
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| 285 | } |
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| 286 | } |
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| 287 | } |
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| 288 | } |
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| 289 | ubidi_close(bidi); |
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| 290 | } |
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| 291 | |
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| 292 | info.set_dimensions(width, height); |
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| 293 | } |
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| 294 | |
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| 295 | void set_pixel_sizes(unsigned size) |
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| 296 | { |
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| 297 | for (std::vector<face_ptr>::iterator face = faces_.begin(); face != faces_.end(); ++face) |
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| 298 | { |
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| 299 | (*face)->set_pixel_sizes(size); |
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| 300 | } |
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| 301 | } |
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| 302 | private: |
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| 303 | std::vector<face_ptr> faces_; |
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| 304 | }; |
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| 305 | |
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| 306 | typedef boost::shared_ptr<font_face_set> face_set_ptr; |
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| 307 | |
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| 308 | class MAPNIK_DECL freetype_engine |
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| 309 | { |
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| 310 | public: |
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| 311 | static bool register_font(std::string const& file_name); |
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| 312 | static std::vector<std::string> face_names (); |
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| 313 | face_ptr create_face(std::string const& family_name); |
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| 314 | virtual ~freetype_engine(); |
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| 315 | freetype_engine(); |
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| 316 | private: |
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| 317 | FT_Library library_; |
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| 318 | static boost::mutex mutex_; |
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| 319 | static std::map<std::string,std::string> name2file_; |
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| 320 | }; |
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| 321 | |
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| 322 | template <typename T> |
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| 323 | class MAPNIK_DECL face_manager : private boost::noncopyable |
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| 324 | { |
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| 325 | typedef T font_engine_type; |
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| 326 | typedef std::map<std::string,face_ptr> faces; |
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| 327 | |
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| 328 | public: |
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| 329 | face_manager(T & engine) |
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| 330 | : engine_(engine) {} |
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| 331 | |
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| 332 | face_ptr get_face(std::string const& name) |
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| 333 | { |
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| 334 | typename faces::iterator itr; |
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| 335 | itr = faces_.find(name); |
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| 336 | if (itr != faces_.end()) |
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| 337 | { |
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| 338 | return itr->second; |
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| 339 | } |
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| 340 | else |
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| 341 | { |
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| 342 | face_ptr face = engine_.create_face(name); |
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| 343 | if (face) |
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| 344 | { |
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| 345 | faces_.insert(make_pair(name,face)); |
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| 346 | } |
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| 347 | return face; |
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| 348 | } |
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| 349 | } |
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| 350 | |
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| 351 | face_set_ptr get_face_set(std::string const& name) |
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| 352 | { |
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| 353 | face_set_ptr face_set(new font_face_set); |
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| 354 | if (face_ptr face = get_face(name)) |
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| 355 | { |
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| 356 | face_set->add(face); |
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| 357 | } |
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| 358 | return face_set; |
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| 359 | } |
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| 360 | |
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| 361 | face_set_ptr get_face_set(font_set const& fset) |
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| 362 | { |
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| 363 | std::vector<std::string> const& names = fset.get_face_names(); |
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| 364 | face_set_ptr face_set(new font_face_set); |
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| 365 | for (std::vector<std::string>::const_iterator name = names.begin(); name != names.end(); ++name) |
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| 366 | { |
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| 367 | if (face_ptr face = get_face(*name)) |
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| 368 | { |
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| 369 | face_set->add(face); |
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| 370 | } |
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| 371 | } |
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| 372 | return face_set; |
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| 373 | } |
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| 374 | private: |
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| 375 | faces faces_; |
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| 376 | font_engine_type & engine_; |
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| 377 | }; |
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| 378 | |
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| 379 | template <typename T> |
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| 380 | struct text_renderer : private boost::noncopyable |
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| 381 | { |
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| 382 | struct glyph_t : boost::noncopyable |
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| 383 | { |
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| 384 | FT_Glyph image; |
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| 385 | glyph_t(FT_Glyph image_) : image(image_) {} |
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| 386 | ~glyph_t () { FT_Done_Glyph(image);} |
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| 387 | }; |
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| 388 | |
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| 389 | typedef boost::ptr_vector<glyph_t> glyphs_t; |
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| 390 | typedef T pixmap_type; |
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| 391 | |
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| 392 | text_renderer (pixmap_type & pixmap, face_set_ptr faces) |
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| 393 | : pixmap_(pixmap), |
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| 394 | faces_(faces), |
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| 395 | fill_(0,0,0), |
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| 396 | halo_fill_(255,255,255), |
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| 397 | halo_radius_(0), |
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| 398 | opacity_(1.0) {} |
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| 399 | |
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| 400 | void set_pixel_size(unsigned size) |
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| 401 | { |
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| 402 | faces_->set_pixel_sizes(size); |
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| 403 | } |
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| 404 | |
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| 405 | void set_fill(mapnik::color const& fill) |
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| 406 | { |
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| 407 | fill_=fill; |
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| 408 | } |
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| 409 | |
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| 410 | void set_halo_fill(mapnik::color const& halo) |
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| 411 | { |
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| 412 | halo_fill_=halo; |
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| 413 | } |
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| 414 | |
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| 415 | void set_halo_radius( int radius=1) |
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| 416 | { |
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| 417 | halo_radius_=radius; |
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| 418 | } |
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| 419 | |
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| 420 | void set_opacity( double opacity=1.0) |
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| 421 | { |
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| 422 | opacity_=opacity; |
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| 423 | } |
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| 424 | |
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| 425 | box2d<double> prepare_glyphs(text_path *path) |
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| 426 | { |
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| 427 | //clear glyphs |
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| 428 | glyphs_.clear(); |
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| 429 | |
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| 430 | FT_Matrix matrix; |
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| 431 | FT_Vector pen; |
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| 432 | FT_Error error; |
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| 433 | |
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| 434 | FT_BBox bbox; |
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| 435 | bbox.xMin = bbox.yMin = 32000; // Initialize these so we can tell if we |
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| 436 | bbox.xMax = bbox.yMax = -32000; // properly grew the bbox later |
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| 437 | |
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| 438 | for (int i = 0; i < path->num_nodes(); i++) |
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| 439 | { |
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| 440 | int c; |
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| 441 | double x, y, angle; |
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| 442 | |
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| 443 | path->vertex(&c, &x, &y, &angle); |
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| 444 | |
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| 445 | #ifdef MAPNIK_DEBUG |
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| 446 | // TODO Enable when we have support for setting verbosity |
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| 447 | //std::clog << "prepare_glyphs: " << c << "," << x << |
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| 448 | // "," << y << "," << angle << std::endl; |
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| 449 | #endif |
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| 450 | |
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| 451 | FT_BBox glyph_bbox; |
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| 452 | FT_Glyph image; |
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| 453 | |
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| 454 | pen.x = int(x * 64); |
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| 455 | pen.y = int(y * 64); |
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| 456 | |
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| 457 | glyph_ptr glyph = faces_->get_glyph(unsigned(c)); |
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| 458 | FT_Face face = glyph->get_face()->get_face(); |
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| 459 | |
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| 460 | matrix.xx = (FT_Fixed)( cos( angle ) * 0x10000L ); |
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| 461 | matrix.xy = (FT_Fixed)(-sin( angle ) * 0x10000L ); |
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| 462 | matrix.yx = (FT_Fixed)( sin( angle ) * 0x10000L ); |
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| 463 | matrix.yy = (FT_Fixed)( cos( angle ) * 0x10000L ); |
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| 464 | |
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| 465 | FT_Set_Transform(face, &matrix, &pen); |
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| 466 | |
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| 467 | error = FT_Load_Glyph(face, glyph->get_index(), FT_LOAD_NO_HINTING); |
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| 468 | if ( error ) |
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| 469 | continue; |
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| 470 | |
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| 471 | error = FT_Get_Glyph(face->glyph, &image); |
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| 472 | if ( error ) |
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| 473 | continue; |
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| 474 | |
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| 475 | FT_Glyph_Get_CBox(image,ft_glyph_bbox_pixels, &glyph_bbox); |
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| 476 | if (glyph_bbox.xMin < bbox.xMin) |
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| 477 | bbox.xMin = glyph_bbox.xMin; |
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| 478 | if (glyph_bbox.yMin < bbox.yMin) |
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| 479 | bbox.yMin = glyph_bbox.yMin; |
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| 480 | if (glyph_bbox.xMax > bbox.xMax) |
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| 481 | bbox.xMax = glyph_bbox.xMax; |
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| 482 | if (glyph_bbox.yMax > bbox.yMax) |
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| 483 | bbox.yMax = glyph_bbox.yMax; |
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| 484 | |
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| 485 | // Check if we properly grew the bbox |
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| 486 | if ( bbox.xMin > bbox.xMax ) |
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| 487 | { |
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| 488 | bbox.xMin = 0; |
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| 489 | bbox.yMin = 0; |
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| 490 | bbox.xMax = 0; |
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| 491 | bbox.yMax = 0; |
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| 492 | } |
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| 493 | |
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| 494 | // take ownership of the glyph |
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| 495 | glyphs_.push_back(new glyph_t(image)); |
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| 496 | } |
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| 497 | |
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| 498 | return box2d<double>(bbox.xMin, bbox.yMin, bbox.xMax, bbox.yMax); |
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| 499 | } |
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| 500 | |
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| 501 | void render(double x0, double y0) |
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| 502 | { |
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| 503 | FT_Error error; |
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| 504 | FT_Vector start; |
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| 505 | unsigned height = pixmap_.height(); |
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| 506 | |
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| 507 | start.x = static_cast<FT_Pos>(x0 * (1 << 6)); |
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| 508 | start.y = static_cast<FT_Pos>((height - y0) * (1 << 6)); |
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| 509 | |
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| 510 | // now render transformed glyphs |
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| 511 | typename glyphs_t::iterator pos; |
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| 512 | |
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| 513 | //make sure we've got reasonable values. |
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| 514 | if (halo_radius_ > 0 && halo_radius_ < 256) |
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| 515 | { |
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| 516 | //render halo |
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| 517 | for ( pos = glyphs_.begin(); pos != glyphs_.end();++pos) |
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| 518 | { |
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| 519 | FT_Glyph_Transform(pos->image,0,&start); |
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| 520 | |
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| 521 | error = FT_Glyph_To_Bitmap( &(pos->image),FT_RENDER_MODE_NORMAL,0,1); |
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| 522 | if ( ! error ) |
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| 523 | { |
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| 524 | |
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| 525 | FT_BitmapGlyph bit = (FT_BitmapGlyph)pos->image; |
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| 526 | render_halo(&bit->bitmap, halo_fill_.rgba(), |
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| 527 | bit->left, |
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| 528 | height - bit->top,halo_radius_); |
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| 529 | } |
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| 530 | } |
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| 531 | } |
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| 532 | //render actual text |
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| 533 | for ( pos = glyphs_.begin(); pos != glyphs_.end();++pos) |
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| 534 | { |
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| 535 | |
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| 536 | FT_Glyph_Transform(pos->image,0,&start); |
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| 537 | |
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| 538 | error = FT_Glyph_To_Bitmap( &(pos->image),FT_RENDER_MODE_NORMAL,0,1); |
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| 539 | if ( ! error ) |
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| 540 | { |
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| 541 | |
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| 542 | FT_BitmapGlyph bit = (FT_BitmapGlyph)pos->image; |
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| 543 | render_bitmap(&bit->bitmap, fill_.rgba(), |
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| 544 | bit->left, |
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| 545 | height - bit->top); |
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| 546 | } |
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| 547 | } |
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| 548 | } |
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| 549 | |
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| 550 | private: |
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| 551 | |
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| 552 | void render_halo(FT_Bitmap *bitmap,unsigned rgba,int x,int y,int radius) |
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| 553 | { |
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| 554 | int x_max=x+bitmap->width; |
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| 555 | int y_max=y+bitmap->rows; |
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| 556 | int i,p,j,q; |
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| 557 | |
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| 558 | for (i=x,p=0;i<x_max;++i,++p) |
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| 559 | { |
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| 560 | for (j=y,q=0;j<y_max;++j,++q) |
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| 561 | { |
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| 562 | int gray = bitmap->buffer[q*bitmap->width+p]; |
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| 563 | if (gray) |
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| 564 | { |
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| 565 | for (int n=-halo_radius_; n <=halo_radius_; ++n) |
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| 566 | for (int m=-halo_radius_;m <= halo_radius_; ++m) |
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| 567 | pixmap_.blendPixel2(i+m,j+n,rgba,gray,opacity_); |
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| 568 | } |
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| 569 | } |
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| 570 | } |
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| 571 | } |
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| 572 | |
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| 573 | void render_bitmap(FT_Bitmap *bitmap,unsigned rgba,int x,int y) |
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| 574 | { |
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| 575 | int x_max=x+bitmap->width; |
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| 576 | int y_max=y+bitmap->rows; |
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| 577 | int i,p,j,q; |
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| 578 | |
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| 579 | for (i=x,p=0;i<x_max;++i,++p) |
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| 580 | { |
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| 581 | for (j=y,q=0;j<y_max;++j,++q) |
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| 582 | { |
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| 583 | int gray=bitmap->buffer[q*bitmap->width+p]; |
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| 584 | if (gray) |
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| 585 | { |
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| 586 | pixmap_.blendPixel2(i,j,rgba,gray,opacity_); |
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| 587 | } |
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| 588 | } |
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| 589 | } |
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| 590 | } |
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| 591 | |
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| 592 | pixmap_type & pixmap_; |
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| 593 | face_set_ptr faces_; |
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| 594 | mapnik::color fill_; |
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| 595 | mapnik::color halo_fill_; |
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| 596 | int halo_radius_; |
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| 597 | unsigned text_ratio_; |
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| 598 | unsigned wrap_width_; |
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| 599 | glyphs_t glyphs_; |
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| 600 | double opacity_; |
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| 601 | }; |
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| 602 | } |
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| 603 | |
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| 604 | #endif // FONT_ENGINE_FREETYPE_HPP |
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