Mercurial > hg > orthanc-stone
annotate Framework/Fonts/FontRenderer.cpp @ 1455:30deba7bc8e2
simplifying include_directories
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 11 Jun 2020 20:54:01 +0200 |
| parents | 8a0a62189f46 |
| children | 28c64c246312 |
| rev | line source |
|---|---|
| 576 | 1 /** |
| 2 * Stone of Orthanc | |
| 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
| 4 * Department, University Hospital of Liege, Belgium | |
|
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium |
| 576 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
| 8 * modify it under the terms of the GNU Affero General Public License | |
| 9 * as published by the Free Software Foundation, either version 3 of | |
| 10 * the License, or (at your option) any later version. | |
| 11 * | |
| 12 * This program is distributed in the hope that it will be useful, but | |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 * Affero General Public License for more details. | |
| 16 * | |
| 17 * You should have received a copy of the GNU Affero General Public License | |
| 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 **/ | |
| 20 | |
| 21 | |
| 22 #include "FontRenderer.h" | |
| 23 | |
| 24 #include "../Toolbox/DynamicBitmap.h" | |
| 25 | |
|
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26 #include <OrthancException.h> |
| 576 | 27 |
| 28 | |
| 29 #include <ft2build.h> | |
| 30 #include FT_FREETYPE_H | |
| 31 #include FT_GLYPH_H | |
| 32 | |
| 33 | |
| 34 // https://stackoverflow.com/questions/31161284/how-can-i-get-the-corresponding-error-string-from-an-ft-error-code | |
| 35 static std::string GetErrorMessage(FT_Error err) | |
| 36 { | |
| 37 #undef __FTERRORS_H__ | |
| 38 #define FT_ERRORDEF( e, v, s ) case e: return s; | |
| 39 #define FT_ERROR_START_LIST switch (err) { | |
| 40 #define FT_ERROR_END_LIST } | |
| 41 #include FT_ERRORS_H | |
| 42 return "(Unknown error)"; | |
| 43 } | |
| 44 | |
| 45 | |
| 46 static void CheckError(FT_Error err) | |
| 47 { | |
| 48 if (err != 0) | |
| 49 { | |
| 50 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, | |
| 51 "Error in FreeType: " + GetErrorMessage(err)); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 | |
| 56 namespace OrthancStone | |
| 57 { | |
| 58 class FontRenderer::PImpl : public boost::noncopyable | |
| 59 { | |
| 60 private: | |
| 61 std::string fontContent_; | |
| 62 FT_Library library_; | |
| 63 FT_Face face_; | |
| 64 | |
| 65 void Clear() | |
| 66 { | |
| 67 if (face_ != NULL) | |
| 68 { | |
| 69 FT_Done_Face(face_); | |
| 70 face_ = NULL; | |
| 71 } | |
| 72 | |
| 73 fontContent_.clear(); | |
| 74 } | |
| 75 | |
| 76 public: | |
| 77 PImpl() : | |
| 78 library_(NULL), | |
| 79 face_(NULL) | |
| 80 { | |
| 81 CheckError(FT_Init_FreeType(&library_)); | |
| 82 } | |
| 83 | |
| 84 | |
| 85 ~PImpl() | |
| 86 { | |
| 87 Clear(); | |
| 88 FT_Done_FreeType(library_); | |
| 89 } | |
| 90 | |
| 91 | |
| 92 void LoadFont(const std::string& fontContent, | |
| 93 unsigned int fontSize) | |
| 94 { | |
| 95 Clear(); | |
| 96 | |
| 97 // It is necessary to make a private copy of the font, as | |
| 98 // Freetype makes the assumption that the buffer containing the | |
| 99 // font is never deleted | |
| 100 fontContent_.assign(fontContent); | |
| 101 | |
| 102 const FT_Byte* data = reinterpret_cast<const FT_Byte*>(fontContent_.c_str()); | |
| 103 | |
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104 CheckError(FT_New_Memory_Face( |
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105 library_, data, static_cast<FT_Long>(fontContent_.size()), 0, &face_)); |
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106 |
| 576 | 107 CheckError(FT_Set_Char_Size(face_, // handle to face object |
| 108 0, // char_width in 1/64th of points | |
| 109 fontSize * 64, // char_height in 1/64th of points | |
| 110 72, // horizontal device resolution | |
| 111 72)); // vertical device resolution | |
| 112 | |
| 113 CheckError(FT_Select_Charmap(face_, FT_ENCODING_UNICODE)); | |
| 114 } | |
| 115 | |
| 116 | |
| 117 Glyph* Render(uint32_t unicode) | |
| 118 { | |
| 119 if (face_ == NULL) | |
| 120 { | |
| 121 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls, | |
| 122 "First call LoadFont()"); | |
| 123 } | |
| 124 else if (FT_Load_Char(face_, unicode, FT_LOAD_RENDER) != 0) | |
| 125 { | |
| 126 // This character is not available | |
| 127 return NULL; | |
| 128 } | |
| 129 else | |
| 130 { | |
| 131 if (face_->glyph->format != FT_GLYPH_FORMAT_BITMAP) | |
| 132 { | |
| 133 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented); | |
| 134 //CheckError(FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 1)); | |
| 135 } | |
| 136 | |
| 137 Orthanc::ImageAccessor bitmap; | |
| 138 bitmap.AssignReadOnly(Orthanc::PixelFormat_Grayscale8, | |
| 139 face_->glyph->bitmap.width, | |
| 140 face_->glyph->bitmap.rows, | |
| 141 face_->glyph->bitmap.pitch, | |
| 142 face_->glyph->bitmap.buffer); | |
| 143 | |
|
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144 std::unique_ptr<Glyph> glyph( |
| 576 | 145 new Glyph(bitmap.GetWidth(), |
| 146 bitmap.GetHeight(), | |
| 147 face_->glyph->bitmap_left, | |
| 148 -face_->glyph->bitmap_top, // Positive for an upwards vertical distance | |
| 149 face_->glyph->advance.x >> 6, | |
| 150 face_->glyph->metrics.vertAdvance >> 6)); | |
| 151 | |
| 152 glyph->SetPayload(new DynamicBitmap(bitmap)); | |
| 153 | |
| 154 return glyph.release(); | |
| 155 } | |
| 156 } | |
| 157 }; | |
| 158 | |
| 159 | |
| 160 | |
| 161 FontRenderer::FontRenderer() : | |
| 162 pimpl_(new PImpl) | |
| 163 { | |
| 164 } | |
| 165 | |
| 166 | |
| 167 void FontRenderer::LoadFont(const std::string& fontContent, | |
| 168 unsigned int fontSize) | |
| 169 { | |
| 170 pimpl_->LoadFont(fontContent, fontSize); | |
| 171 } | |
| 172 | |
| 173 | |
| 174 void FontRenderer::LoadFont(Orthanc::EmbeddedResources::FileResourceId resource, | |
| 175 unsigned int fontSize) | |
| 176 { | |
| 177 std::string content; | |
| 178 Orthanc::EmbeddedResources::GetFileResource(content, resource); | |
| 179 LoadFont(content, fontSize); | |
| 180 } | |
| 181 | |
| 182 | |
| 183 Glyph* FontRenderer::Render(uint32_t unicode) | |
| 184 { | |
| 185 return pimpl_->Render(unicode); | |
| 186 } | |
| 187 } |