Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Fonts/FontRenderer.cpp @ 1808:797633f48a9c
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 20 May 2021 17:28:16 +0200 |
| parents | 9ac2a65d4172 |
| children | 3889ae96d2e9 |
| 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) 2017-2021 Osimis S.A., Belgium |
| 576 | 6 * |
| 7 * This program 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 License |
| 576 | 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 | |
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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 program. If not, see |
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19 * <http://www.gnu.org/licenses/>. |
| 576 | 20 **/ |
| 21 | |
| 22 | |
| 23 #include "FontRenderer.h" | |
| 24 | |
| 25 #include "../Toolbox/DynamicBitmap.h" | |
| 26 | |
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27 #include <OrthancException.h> |
| 576 | 28 |
| 29 | |
| 30 #include <ft2build.h> | |
| 31 #include FT_FREETYPE_H | |
| 32 #include FT_GLYPH_H | |
| 33 | |
| 34 | |
| 35 // https://stackoverflow.com/questions/31161284/how-can-i-get-the-corresponding-error-string-from-an-ft-error-code | |
| 36 static std::string GetErrorMessage(FT_Error err) | |
| 37 { | |
| 38 #undef __FTERRORS_H__ | |
| 39 #define FT_ERRORDEF( e, v, s ) case e: return s; | |
| 40 #define FT_ERROR_START_LIST switch (err) { | |
| 41 #define FT_ERROR_END_LIST } | |
| 42 #include FT_ERRORS_H | |
| 43 return "(Unknown error)"; | |
| 44 } | |
| 45 | |
| 46 | |
| 47 static void CheckError(FT_Error err) | |
| 48 { | |
| 49 if (err != 0) | |
| 50 { | |
| 51 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, | |
| 52 "Error in FreeType: " + GetErrorMessage(err)); | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 | |
| 57 namespace OrthancStone | |
| 58 { | |
| 59 class FontRenderer::PImpl : public boost::noncopyable | |
| 60 { | |
| 61 private: | |
| 62 std::string fontContent_; | |
| 63 FT_Library library_; | |
| 64 FT_Face face_; | |
| 65 | |
| 66 void Clear() | |
| 67 { | |
| 68 if (face_ != NULL) | |
| 69 { | |
| 70 FT_Done_Face(face_); | |
| 71 face_ = NULL; | |
| 72 } | |
| 73 | |
| 74 fontContent_.clear(); | |
| 75 } | |
| 76 | |
| 77 public: | |
| 78 PImpl() : | |
| 79 library_(NULL), | |
| 80 face_(NULL) | |
| 81 { | |
| 82 CheckError(FT_Init_FreeType(&library_)); | |
| 83 } | |
| 84 | |
| 85 | |
| 86 ~PImpl() | |
| 87 { | |
| 88 Clear(); | |
| 89 FT_Done_FreeType(library_); | |
| 90 } | |
| 91 | |
| 92 | |
| 93 void LoadFont(const std::string& fontContent, | |
| 94 unsigned int fontSize) | |
| 95 { | |
| 96 Clear(); | |
| 97 | |
| 98 // It is necessary to make a private copy of the font, as | |
| 99 // Freetype makes the assumption that the buffer containing the | |
| 100 // font is never deleted | |
| 101 fontContent_.assign(fontContent); | |
| 102 | |
| 103 const FT_Byte* data = reinterpret_cast<const FT_Byte*>(fontContent_.c_str()); | |
| 104 | |
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105 CheckError(FT_New_Memory_Face( |
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106 library_, data, static_cast<FT_Long>(fontContent_.size()), 0, &face_)); |
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107 |
| 576 | 108 CheckError(FT_Set_Char_Size(face_, // handle to face object |
| 109 0, // char_width in 1/64th of points | |
| 110 fontSize * 64, // char_height in 1/64th of points | |
| 111 72, // horizontal device resolution | |
| 112 72)); // vertical device resolution | |
| 113 | |
| 114 CheckError(FT_Select_Charmap(face_, FT_ENCODING_UNICODE)); | |
| 115 } | |
| 116 | |
| 117 | |
| 118 Glyph* Render(uint32_t unicode) | |
| 119 { | |
| 120 if (face_ == NULL) | |
| 121 { | |
| 122 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls, | |
| 123 "First call LoadFont()"); | |
| 124 } | |
| 125 else if (FT_Load_Char(face_, unicode, FT_LOAD_RENDER) != 0) | |
| 126 { | |
| 127 // This character is not available | |
| 128 return NULL; | |
| 129 } | |
| 130 else | |
| 131 { | |
| 132 if (face_->glyph->format != FT_GLYPH_FORMAT_BITMAP) | |
| 133 { | |
| 134 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented); | |
| 135 //CheckError(FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 1)); | |
| 136 } | |
| 137 | |
| 138 Orthanc::ImageAccessor bitmap; | |
| 139 bitmap.AssignReadOnly(Orthanc::PixelFormat_Grayscale8, | |
| 140 face_->glyph->bitmap.width, | |
| 141 face_->glyph->bitmap.rows, | |
| 142 face_->glyph->bitmap.pitch, | |
| 143 face_->glyph->bitmap.buffer); | |
| 144 | |
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145 std::unique_ptr<Glyph> glyph( |
| 576 | 146 new Glyph(bitmap.GetWidth(), |
| 147 bitmap.GetHeight(), | |
| 148 face_->glyph->bitmap_left, | |
| 149 -face_->glyph->bitmap_top, // Positive for an upwards vertical distance | |
| 150 face_->glyph->advance.x >> 6, | |
| 151 face_->glyph->metrics.vertAdvance >> 6)); | |
| 152 | |
| 153 glyph->SetPayload(new DynamicBitmap(bitmap)); | |
| 154 | |
| 155 return glyph.release(); | |
| 156 } | |
| 157 } | |
| 158 }; | |
| 159 | |
| 160 | |
| 161 | |
| 162 FontRenderer::FontRenderer() : | |
| 163 pimpl_(new PImpl) | |
| 164 { | |
| 165 } | |
| 166 | |
| 167 | |
| 168 void FontRenderer::LoadFont(const std::string& fontContent, | |
| 169 unsigned int fontSize) | |
| 170 { | |
| 171 pimpl_->LoadFont(fontContent, fontSize); | |
| 172 } | |
| 173 | |
| 174 | |
| 175 Glyph* FontRenderer::Render(uint32_t unicode) | |
| 176 { | |
| 177 return pimpl_->Render(unicode); | |
| 178 } | |
| 179 } |