Mercurial > hg > orthanc-stone
view OrthancStone/Sources/Fonts/FontRenderer.cpp @ 1995:f2a094fa8c33
updated TODO
author | Sebastien Jodogne <s.jodogne@gmail.com> |
---|---|
date | Tue, 01 Nov 2022 19:04:34 +0100 |
parents | 7053b8a0aaec |
children | 07964689cb0b |
line wrap: on
line source
/** * Stone of Orthanc * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2022 Osimis S.A., Belgium * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium * * This program 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 3 of * the License, or (at your option) any later version. * * This program 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 program. If not, see * <http://www.gnu.org/licenses/>. **/ #include "FontRenderer.h" #include "../Toolbox/DynamicBitmap.h" #include <OrthancException.h> #include <ft2build.h> #include FT_FREETYPE_H #include FT_GLYPH_H // https://stackoverflow.com/questions/31161284/how-can-i-get-the-corresponding-error-string-from-an-ft-error-code static std::string GetErrorMessage(FT_Error err) { #undef __FTERRORS_H__ #define FT_ERRORDEF( e, v, s ) case e: return s; #define FT_ERROR_START_LIST switch (err) { #define FT_ERROR_END_LIST } #include FT_ERRORS_H return "(Unknown error)"; } static void CheckError(FT_Error err) { if (err != 0) { throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, "Error in FreeType: " + GetErrorMessage(err)); } } namespace OrthancStone { class FontRenderer::PImpl : public boost::noncopyable { private: std::string fontContent_; FT_Library library_; FT_Face face_; void Clear() { if (face_ != NULL) { FT_Done_Face(face_); face_ = NULL; } fontContent_.clear(); } public: PImpl() : library_(NULL), face_(NULL) { CheckError(FT_Init_FreeType(&library_)); } ~PImpl() { Clear(); FT_Done_FreeType(library_); } void LoadFont(const std::string& fontContent, unsigned int fontSize) { Clear(); // It is necessary to make a private copy of the font, as // Freetype makes the assumption that the buffer containing the // font is never deleted fontContent_.assign(fontContent); const FT_Byte* data = reinterpret_cast<const FT_Byte*>(fontContent_.c_str()); CheckError(FT_New_Memory_Face( library_, data, static_cast<FT_Long>(fontContent_.size()), 0, &face_)); CheckError(FT_Set_Char_Size(face_, // handle to face object 0, // char_width in 1/64th of points fontSize * 64, // char_height in 1/64th of points 72, // horizontal device resolution 72)); // vertical device resolution CheckError(FT_Select_Charmap(face_, FT_ENCODING_UNICODE)); } Glyph* Render(uint32_t unicode) { if (face_ == NULL) { throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls, "First call LoadFont()"); } else if (FT_Load_Char(face_, unicode, FT_LOAD_RENDER) != 0) { // This character is not available return NULL; } else { if (face_->glyph->format != FT_GLYPH_FORMAT_BITMAP) { throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented); //CheckError(FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 1)); } Orthanc::ImageAccessor bitmap; bitmap.AssignReadOnly(Orthanc::PixelFormat_Grayscale8, face_->glyph->bitmap.width, face_->glyph->bitmap.rows, face_->glyph->bitmap.pitch, face_->glyph->bitmap.buffer); std::unique_ptr<Glyph> glyph( new Glyph(bitmap.GetWidth(), bitmap.GetHeight(), face_->glyph->bitmap_left, -face_->glyph->bitmap_top, // Positive for an upwards vertical distance face_->glyph->advance.x >> 6, face_->glyph->metrics.vertAdvance >> 6)); glyph->SetPayload(new DynamicBitmap(bitmap)); return glyph.release(); } } }; FontRenderer::FontRenderer() : pimpl_(new PImpl) { } void FontRenderer::LoadFont(const std::string& fontContent, unsigned int fontSize) { pimpl_->LoadFont(fontContent, fontSize); } Glyph* FontRenderer::Render(uint32_t unicode) { return pimpl_->Render(unicode); } }