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1289 lines
39 KiB
C++
1289 lines
39 KiB
C++
/*
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* OGLFT: A library for drawing text with OpenGL using the FreeType library
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* Copyright (C) 2002 lignum Computing, Inc. <oglft@lignumcomputing.com>
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* $Id: OGLFT.cpp,v 1.11 2003/10/01 14:21:18 allen Exp $
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <string.h>
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#include <cmath>
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#include <iomanip>
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#include <iostream>
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#include <utility>
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#include "OGLFT.h"
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int wstrlen(const wchar_t * s)
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{
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int r = 0;
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while (*s++) r++;
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return r;
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}
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namespace OGLFT
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{
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FT_Library ft_library;
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bool Init_FT(void)
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{
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FT_Error error = FT_Init_FreeType(&ft_library);
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if(error != 0) std::cerr << "[OGLFT] Could not initialize the FreeType library." << std::endl;
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return (error == 0);
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}
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bool Uninit_FT(void)
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{
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FT_Error error = FT_Done_FreeType(ft_library);
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if(error != 0) std::cerr << "[OGLFT] Could not terminate the FreeType library." << std::endl;
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return (error == 0);
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}
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// Load a new face
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Face::Face (const char* filename, float point_size, FT_UInt resolution)
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: point_size_(point_size), resolution_(resolution)
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{
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valid_ = true;
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FT_Face ft_face;
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FT_Error error = FT_New_Face(ft_library, filename, 0, &ft_face);
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if(error != 0)
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{
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valid_ = false;
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return;
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}
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// As of FreeType 2.1: only a UNICODE charmap is automatically activated.
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// If no charmap is activated automatically, just use the first one.
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if(ft_face->charmap == 0 && ft_face->num_charmaps > 0) FT_Select_Charmap(ft_face, ft_face->charmaps[0]->encoding);
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faces_.push_back(FaceData(ft_face));
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init();
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}
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// Go with a face that the user has already opened.
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Face::Face (FT_Face face, float point_size, FT_UInt resolution)
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: point_size_(point_size), resolution_(resolution)
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{
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valid_ = true;
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// As of FreeType 2.1: only a UNICODE charmap is automatically activated.
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// If no charmap is activated automatically, just use the first one.
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if(face->charmap == 0 && face->num_charmaps > 0) FT_Select_Charmap(face, face->charmaps[0]->encoding);
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faces_.push_back(FaceData(face, false));
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init();
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}
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// Standard initialization behavior once the font file is opened.
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void Face::init (void)
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{
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// By default, each glyph is compiled into a display list the first
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// time it is encountered
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compile_mode_ = COMPILE;
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// By default, all drawing is wrapped with push/pop matrix so that the
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// MODELVIEW matrix is not modified. If advance_ is set, then subsequent
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// drawings follow from the advance of the last glyph rendered.
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advance_ = false;
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// Initialize the default colors
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foreground_color_[R] = 0.; foreground_color_[G] = 0.; foreground_color_[B] = 0.; foreground_color_[A] = 1.;
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background_color_[R] = 1.; background_color_[G] = 1.; background_color_[B] = 1.; background_color_[A] = 0.;
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// The default positioning of the text is at the origin of the first glyph
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horizontal_justification_ = ORIGIN;
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vertical_justification_ = BASELINE;
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// By default, strings are rendered in their nominal direction
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string_rotation_ = 0;
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// setCharacterRotationReference calls the virtual function clearCaches()
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// so it is up to a subclass to set the real default
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rotation_reference_glyph_ = 0;
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rotation_reference_face_ = 0;
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rotation_offset_y_ = 0.;
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}
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Face::~Face (void)
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{
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for(unsigned int i=0; i<faces_.size(); i++)
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if(faces_[i].free_on_exit_)
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FT_Done_Face(faces_[i].face_);
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}
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// Add another Face to select characters from
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bool Face::addAuxiliaryFace (const char* filename)
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{
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FT_Face ft_face;
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FT_Error error = FT_New_Face(ft_library, filename, 0, &ft_face);
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if(error != 0) return false;
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faces_.push_back(FaceData(ft_face));
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setCharSize();
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return true;
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}
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// Add another Face to select characters from
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bool Face::addAuxiliaryFace (FT_Face face)
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{
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faces_.push_back(FaceData(face, false));
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setCharSize();
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return true;
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}
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// Note: Changing the point size also clears the display list cache
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void Face::setPointSize (float point_size)
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{
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if(point_size != point_size_)
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{
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point_size_ = point_size;
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clearCaches();
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setCharSize();
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}
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}
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// Note: Changing the resolution also clears the display list cache
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void Face::setResolution (FT_UInt resolution)
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{
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if(resolution != resolution_)
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{
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resolution_ = resolution;
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clearCaches();
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setCharSize();
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}
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}
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// Note: Changing the background color also clears the display list cache.
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void Face::setBackgroundColor (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha)
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{
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if(background_color_[R] != red||background_color_[G] != green||background_color_[B] != blue||background_color_[A] != alpha)
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{
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background_color_[R] = red;
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background_color_[G] = green;
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background_color_[B] = blue;
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background_color_[A] = alpha;
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}
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}
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// Note: Changing the foreground color also clears the display list cache.
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void Face::setForegroundColor (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha)
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{
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if(foreground_color_[R] != red||foreground_color_[G] != green||foreground_color_[B] != blue||foreground_color_[A] != alpha)
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{
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foreground_color_[R] = red;
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foreground_color_[G] = green;
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foreground_color_[B] = blue;
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foreground_color_[A] = alpha;
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}
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}
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// Note: Changing the foreground color also clears the display list cache.
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void Face::setForegroundColor (const GLfloat foreground_color[4])
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{
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foreground_color_[R] = foreground_color[R];
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foreground_color_[G] = foreground_color[G];
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foreground_color_[B] = foreground_color[B];
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foreground_color_[A] = foreground_color[A];
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}
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// Note: Changing the background color also clears the display list cache.
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void Face::setBackgroundColor (const GLfloat background_color[4])
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{
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background_color_[R] = background_color[R];
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background_color_[G] = background_color[G];
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background_color_[B] = background_color[B];
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background_color_[A] = background_color[A];
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}
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// Note: Changing the string rotation angle clears the display list cache
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void Face::setStringRotation (GLfloat string_rotation)
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{
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if(string_rotation != string_rotation_)
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{
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string_rotation_ = string_rotation;
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clearCaches();
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// Note that this affects ALL glyphs accessed through
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// the Face, both the vector and the raster glyphs. Very nice!
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if (string_rotation_ != 0)
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{
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float angle;
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if (string_rotation_<0)
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angle = 360.0f - fmod(fabs(string_rotation_), 360.f);
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else
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angle = fmod(string_rotation_, 360.f);
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FT_Matrix rotation_matrix;
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FT_Vector sinus;
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FT_Vector_Unit(&sinus, (FT_Angle)(angle * 0x10000L));
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rotation_matrix.xx = sinus.x;
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rotation_matrix.xy = -sinus.y;
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rotation_matrix.yx = sinus.y;
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rotation_matrix.yy = sinus.x;
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for(unsigned int i=0; i<faces_.size(); i++) FT_Set_Transform(faces_[i].face_, &rotation_matrix, 0);
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}
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else for(unsigned int i=0; i<faces_.size(); i++) FT_Set_Transform(faces_[i].face_, 0, 0);
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}
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}
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// Note: Changing the rotation reference character clears the display list cache.
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void Face::setCharacterRotationReference (unsigned char c)
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{
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unsigned int f;
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FT_UInt glyph_index = 0;
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for(f=0; f<faces_.size(); f++)
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{
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glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
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if(glyph_index != 0) break;
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}
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if(f<faces_.size() && glyph_index != rotation_reference_glyph_)
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{
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FT_Error error = FT_Load_Glyph(faces_[f].face_, glyph_index, FT_LOAD_DEFAULT);
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if(error != 0) return;
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rotation_reference_glyph_ = glyph_index;
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rotation_reference_face_ = faces_[f].face_;
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setRotationOffset();
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clearCaches();
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}
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}
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BBox Face::measure (const char* s)
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{
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BBox bbox;
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char c;
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if((c = *s++) != 0)
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{
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bbox = measure((unsigned char)c);
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for(c = *s; c != 0; c = *++s)
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{
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BBox char_bbox = measure((unsigned char)c);
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bbox += char_bbox;
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}
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}
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// make sure the origin is at 0,0
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if (bbox.x_min_ != 0)
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{
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bbox.x_max_ -= bbox.x_min_;
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bbox.x_min_ = 0;
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}
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if (bbox.y_min_ != 0)
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{
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bbox.y_max_ -= bbox.y_min_;
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bbox.y_min_ = 0;
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}
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return bbox;
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}
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BBox Face::measureRaw (const char* s)
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{
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BBox bbox;
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for(char c = *s; c != 0; c = *++s)
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{
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BBox char_bbox;
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unsigned int f;
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FT_UInt glyph_index = 0;
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for(f=0; f<faces_.size(); f++)
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{
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glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
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if(glyph_index != 0) break;
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}
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if(glyph_index == 0) continue;
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FT_Error error = FT_Load_Glyph(faces_[f].face_, glyph_index, FT_LOAD_DEFAULT);
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if(error != 0) continue;
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FT_Glyph glyph;
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error = FT_Get_Glyph(faces_[f].face_->glyph, &glyph);
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if(error != 0) continue;
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FT_BBox ft_bbox;
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FT_Glyph_Get_CBox(glyph, ft_glyph_bbox_unscaled, &ft_bbox);
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FT_Done_Glyph(glyph);
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char_bbox = ft_bbox;
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char_bbox.advance_ = faces_[f].face_->glyph->advance;
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bbox += char_bbox;
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}
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return bbox;
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}
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BBox Face::measure (const wchar_t* s)
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{
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BBox bbox;
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int i;
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if(wstrlen(s) > 0)
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{
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bbox = measure(s[0]);
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for(i = 1; i < wstrlen(s); i++)
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{
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BBox char_bbox = measure(s[i]);
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bbox += char_bbox;
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}
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}
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// make sure the origin is at 0,0
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if (bbox.x_min_ != 0)
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{
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bbox.x_max_ -= bbox.x_min_;
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bbox.x_min_ = 0;
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}
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if (bbox.y_min_ != 0)
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{
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bbox.y_max_ -= bbox.y_min_;
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bbox.y_min_ = 0;
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}
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return bbox;
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}
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BBox Face::measureRaw (const wchar_t* s)
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{
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BBox bbox;
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int i;
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for(i = 0; i < wstrlen(s); i++)
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{
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BBox char_bbox;
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unsigned int f;
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FT_UInt glyph_index = 0;
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for(f=0; f<faces_.size(); f++)
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{
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glyph_index = FT_Get_Char_Index(faces_[f].face_, s[i]);
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if(glyph_index != 0) break;
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}
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if(glyph_index == 0)
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{
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continue;
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}
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FT_Error error = FT_Load_Glyph(faces_[f].face_, glyph_index, FT_LOAD_DEFAULT);
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if(error != 0) continue;
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FT_Glyph glyph;
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error = FT_Get_Glyph(faces_[f].face_->glyph, &glyph);
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if(error != 0) continue;
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FT_BBox ft_bbox;
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FT_Glyph_Get_CBox(glyph, ft_glyph_bbox_unscaled, &ft_bbox);
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FT_Done_Glyph(glyph);
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char_bbox = ft_bbox;
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char_bbox.advance_ = faces_[f].face_->glyph->advance;
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bbox += char_bbox;
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}
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return bbox;
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}
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// Measure the bounding box as if the (latin1) string were not rotated
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BBox Face::measure_nominal (const char* s)
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{
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if(string_rotation_ == 0.) return measure(s);
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for(unsigned int f=0; f<faces_.size(); f++) FT_Set_Transform(faces_[f].face_, 0, 0);
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BBox bbox = measure(s);
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float angle;
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if(string_rotation_<0.)
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angle = 360.0f - fmod(fabs(string_rotation_), 360.f);
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else
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angle = fmod(string_rotation_, 360.f);
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FT_Matrix rotation_matrix;
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FT_Vector sinus;
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FT_Vector_Unit(&sinus, (FT_Angle)(angle * 0x10000L));
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rotation_matrix.xx = sinus.x;
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rotation_matrix.xy = -sinus.y;
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rotation_matrix.yx = sinus.y;
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rotation_matrix.yy = sinus.x;
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for(unsigned int f=0; f<faces_.size(); f++) FT_Set_Transform(faces_[f].face_, &rotation_matrix, 0);
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return bbox;
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}
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// Measure the bounding box as if the (UNICODE) string were not rotated
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BBox Face::measure_nominal (const wchar_t* s)
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{
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if(string_rotation_ == 0.)return measure(s);
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for(unsigned int f=0; f<faces_.size(); f++)FT_Set_Transform(faces_[f].face_, 0, 0);
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BBox bbox = measure(s);
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float angle;
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if(string_rotation_<0.0)
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angle = 360.0f - fmod(fabs(string_rotation_), 360.f);
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else
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angle = fmod(string_rotation_, 360.f);
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FT_Matrix rotation_matrix;
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FT_Vector sinus;
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FT_Vector_Unit(&sinus, (FT_Angle)(angle * 0x10000L));
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rotation_matrix.xx = sinus.x;
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rotation_matrix.xy = -sinus.y;
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rotation_matrix.yx = sinus.y;
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rotation_matrix.yy = sinus.x;
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for(unsigned int f=0; f<faces_.size(); f++)FT_Set_Transform(faces_[f].face_, &rotation_matrix, 0);
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return bbox;
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}
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// Compile a (latin1) character glyph into a display list and cache
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// it for later
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GLuint Face::compile (unsigned char c)
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{
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// See if we've done it already
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GDLCI fgi = glyph_dlists_.find(c);
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if(fgi != glyph_dlists_.end())return fgi->second;
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unsigned int f;
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FT_UInt glyph_index = 0;
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for(f=0; f<faces_.size(); f++)
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{
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glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
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if(glyph_index != 0) break;
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}
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if(glyph_index == 0)return 0;
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GLuint dlist = compileGlyph(faces_[f].face_, glyph_index);
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glyph_dlists_[ c ] = dlist;
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return dlist;
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}
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// Compile a (UNICODE) character glyph into a display list and cache
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// it for later
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GLuint Face::compile (const wchar_t c)
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{
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// See if we've done it already
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GDLCI fgi = glyph_dlists_.find(c);
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if(fgi != glyph_dlists_.end())return fgi->second;
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unsigned int f;
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FT_UInt glyph_index = 0;
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for(f=0; f<faces_.size(); f++)
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{
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glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
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if(glyph_index != 0) break;
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}
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if(glyph_index == 0)return 0;
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GLuint dlist = compileGlyph(faces_[f].face_, glyph_index);
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glyph_dlists_[ c ] = dlist;
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return dlist;
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}
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// Assume the MODELVIEW matrix is already set and draw the (latin1)
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// string. Note: this routine now ignores almost all settings:
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// including the position (both modelview and raster), color,
|
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// justification and advance settings. Consider this to be the raw
|
|
// drawing routine for which you are responsible for most of the
|
|
// setup.
|
|
void Face::draw (const char* s)
|
|
{
|
|
DLCI character_display_list = character_display_lists_.begin();
|
|
|
|
for(char c = *s; c != 0; c = *++s)
|
|
{
|
|
if(character_display_list != character_display_lists_.end())
|
|
{
|
|
glCallList(*character_display_list);
|
|
character_display_list++;
|
|
}
|
|
draw((unsigned char)c);
|
|
}
|
|
}
|
|
|
|
// Assume the MODELVIEW matrix is already set and draw the (UNICODE)
|
|
// string. Note: this routine now ignores almost all settings:
|
|
// including the position (both modelview and raster), color,
|
|
// justification and advance settings. Consider this to be the raw
|
|
// drawing routine for which you are responsible for most of the
|
|
// setup.
|
|
void Face::draw (const wchar_t* s)
|
|
{
|
|
DLCI character_display_list = character_display_lists_.begin();
|
|
int i;
|
|
|
|
for(i = 0; i < wstrlen(s); i++)
|
|
{
|
|
if(character_display_list != character_display_lists_.end())
|
|
{
|
|
glCallList(*character_display_list);
|
|
character_display_list++;
|
|
}
|
|
draw(s[i]);
|
|
}
|
|
}
|
|
|
|
// Assume the MODELVIEW matrix is already setup and draw the
|
|
// (latin1) character.
|
|
void Face::draw (unsigned char c)
|
|
{
|
|
// See if we've done it already
|
|
GDLCI fgi = glyph_dlists_.find(c);
|
|
|
|
if(fgi != glyph_dlists_.end())
|
|
{
|
|
glCallList(fgi->second);
|
|
return;
|
|
}
|
|
|
|
unsigned int f;
|
|
FT_UInt glyph_index = 0;
|
|
|
|
for(f=0; f<faces_.size(); f++)
|
|
{
|
|
glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
|
|
if(glyph_index != 0) break;
|
|
}
|
|
|
|
if(glyph_index == 0) return;
|
|
|
|
if(compile_mode_ == COMPILE)
|
|
{
|
|
GLuint dlist = compile(c);
|
|
glCallList(dlist);
|
|
}
|
|
else renderGlyph(faces_[f].face_, glyph_index);
|
|
}
|
|
|
|
// Assume the MODELVIEW matrix is already setup and draw the
|
|
// (UNICODE) character.
|
|
|
|
void Face::draw (const wchar_t c)
|
|
{
|
|
// See if we've done it already
|
|
GDLCI fgi = glyph_dlists_.find(c);
|
|
|
|
if(fgi != glyph_dlists_.end())
|
|
{
|
|
glCallList(fgi->second);
|
|
return;
|
|
}
|
|
|
|
unsigned int f;
|
|
FT_UInt glyph_index = 0;
|
|
|
|
for(f=0; f<faces_.size(); f++)
|
|
{
|
|
glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
|
|
if(glyph_index != 0) break;
|
|
}
|
|
|
|
if(glyph_index == 0) return;
|
|
|
|
if(compile_mode_ == COMPILE)
|
|
{
|
|
GLuint dlist = compile(c);
|
|
glCallList(dlist);
|
|
}
|
|
else renderGlyph(faces_[f].face_, glyph_index);
|
|
}
|
|
|
|
// Draw the (latin1) character at the given position. The MODELVIEW
|
|
// matrix is modified by the glyph advance.
|
|
void Face::draw (GLfloat x, GLfloat y, unsigned char c)
|
|
{
|
|
glTranslatef(x, y, 0.);
|
|
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B], foreground_color_[A]);
|
|
|
|
glRasterPos3i(0, 0, 0);
|
|
|
|
draw(c);
|
|
}
|
|
|
|
// Draw the (latin1) character at the given position. The MODELVIEW
|
|
// matrix is modified by the glyph advance.
|
|
void Face::draw (GLfloat x, GLfloat y, GLfloat z, unsigned char c)
|
|
{
|
|
glTranslatef(x, y, z);
|
|
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B], foreground_color_[A]);
|
|
|
|
glRasterPos3i(0, 0, 0);
|
|
|
|
draw(c);
|
|
}
|
|
|
|
// Draw the (UNICODE) character at the given position. The MODELVIEW
|
|
// matrix is modified by the glyph advance.
|
|
void Face::draw (GLfloat x, GLfloat y, wchar_t c)
|
|
{
|
|
glTranslatef(x, y, 0.);
|
|
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B],
|
|
foreground_color_[A]);
|
|
|
|
glRasterPos3i(0, 0, 0);
|
|
|
|
draw(c);
|
|
}
|
|
|
|
// Draw the (UNICODE) character at the given position. The MODELVIEW
|
|
// matrix is modified by the glyph advance.
|
|
void Face::draw (GLfloat x, GLfloat y, GLfloat z, wchar_t c)
|
|
{
|
|
glTranslatef(x, y, z);
|
|
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B], foreground_color_[A]);
|
|
|
|
glRasterPos3i(0, 0, 0);
|
|
|
|
draw(c);
|
|
}
|
|
|
|
|
|
// Draw the (latin1) string at the given position.
|
|
void Face::draw (GLfloat x, GLfloat y, const char* s, float *sizebox)
|
|
{
|
|
// sizebox is xmin,ymin, xmax,ymax
|
|
if(!advance_) glPushMatrix();
|
|
|
|
if(horizontal_justification_ != ORIGIN || vertical_justification_ != BASELINE)
|
|
{
|
|
glPushMatrix();
|
|
|
|
GLfloat dx = 0, dy = 0;
|
|
|
|
switch (horizontal_justification_)
|
|
{
|
|
case LEFT: dx = -sizebox[0] + 1; break;
|
|
case CENTER: dx = -(sizebox[0] + sizebox[2])/ 2.0f; break;
|
|
case RIGHT: dx = -sizebox[2] - 1; break;
|
|
default: break;
|
|
}
|
|
switch (vertical_justification_)
|
|
{
|
|
case BOTTOM: dy = -sizebox[1] + 1; break;
|
|
case MIDDLE: dy = -(sizebox[1] + sizebox[3])/ 2.0f; break;
|
|
case TOP: dy = -sizebox[3] - 1; break;
|
|
default: break;
|
|
}
|
|
|
|
// There is probably a less expensive way to compute this
|
|
glRotatef(string_rotation_, 0., 0., 1.);
|
|
glTranslatef(dx, dy, 0);
|
|
glRotatef(-string_rotation_, 0., 0., 1.);
|
|
}
|
|
|
|
glTranslatef(x, y, 0.);
|
|
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B], foreground_color_[A]);
|
|
|
|
glRasterPos3i(0, 0, 0);
|
|
|
|
draw(s);
|
|
|
|
if(horizontal_justification_ != ORIGIN || vertical_justification_ != BASELINE) glPopMatrix();
|
|
|
|
if(!advance_) glPopMatrix();
|
|
}
|
|
|
|
// Draw the (latin1) string at the given position.
|
|
void Face::draw (GLfloat x, GLfloat y, GLfloat z, const char* s)
|
|
{
|
|
if(!advance_) glPushMatrix();
|
|
|
|
if(horizontal_justification_ != ORIGIN || vertical_justification_ != BASELINE)
|
|
{
|
|
glPushMatrix();
|
|
|
|
BBox bbox = measure_nominal(s);
|
|
|
|
GLfloat dx = 0, dy = 0;
|
|
|
|
switch (horizontal_justification_)
|
|
{
|
|
case LEFT: dx = -bbox.x_min_; break;
|
|
case CENTER: dx = -(bbox.x_min_ + bbox.x_max_)/ 2.0f; break;
|
|
case RIGHT: dx = -bbox.x_max_; break;
|
|
default: break;
|
|
}
|
|
switch (vertical_justification_)
|
|
{
|
|
case BOTTOM: dy = -bbox.y_min_; break;
|
|
case MIDDLE: dy = -(bbox.y_min_ + bbox.y_max_)/ 2.0f; break;
|
|
case TOP: dy = -bbox.y_max_; break;
|
|
default: break;
|
|
}
|
|
|
|
// There is probably a less expensive way to compute this
|
|
glRotatef(string_rotation_, 0., 0., 1.);
|
|
glTranslatef(dx, dy, 0);
|
|
glRotatef(-string_rotation_, 0., 0., 1.);
|
|
}
|
|
|
|
glTranslatef(x, y, z);
|
|
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B], foreground_color_[A]);
|
|
|
|
glRasterPos3i(0, 0, 0);
|
|
|
|
draw(s);
|
|
|
|
if(horizontal_justification_ != ORIGIN || vertical_justification_ != BASELINE) glPopMatrix();
|
|
|
|
if(!advance_) glPopMatrix();
|
|
}
|
|
|
|
// Draw the (UNICODE) string at the given position.
|
|
void Face::draw (GLfloat x, GLfloat y, const wchar_t* s)
|
|
{
|
|
if(!advance_)
|
|
glPushMatrix();
|
|
|
|
if(horizontal_justification_!=ORIGIN||vertical_justification_!=BASELINE)
|
|
{
|
|
glPushMatrix();
|
|
|
|
BBox bbox = measure_nominal(s);
|
|
|
|
GLfloat dx = 0, dy = 0;
|
|
|
|
switch (horizontal_justification_)
|
|
{
|
|
case LEFT:
|
|
dx = -bbox.x_min_; break;
|
|
case CENTER:
|
|
dx = -(bbox.x_min_ + bbox.x_max_)/ 2.0f; break;
|
|
case RIGHT:
|
|
dx = -bbox.x_max_; break;
|
|
default:
|
|
break;
|
|
}
|
|
switch (vertical_justification_)
|
|
{
|
|
case BOTTOM:
|
|
dy = -bbox.y_min_; break;
|
|
case MIDDLE:
|
|
dy = -(bbox.y_min_ + bbox.y_max_)/ 2.0f; break;
|
|
case TOP:
|
|
dy = -bbox.y_max_; break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// There is probably a less expensive way to compute this
|
|
glRotatef(string_rotation_, 0., 0., 1.);
|
|
glTranslatef(dx, dy, 0);
|
|
glRotatef(-string_rotation_, 0., 0., 1.);
|
|
}
|
|
|
|
glTranslatef(x, y, 0.);
|
|
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B],
|
|
foreground_color_[A]);
|
|
|
|
glRasterPos3i(0, 0, 0);
|
|
|
|
draw(s);
|
|
|
|
if(horizontal_justification_ != ORIGIN ||
|
|
vertical_justification_ != BASELINE)
|
|
glPopMatrix();
|
|
|
|
if(!advance_)
|
|
glPopMatrix();
|
|
}
|
|
|
|
// Draw the (UNICODE) string at the given position.
|
|
void Face::draw (GLfloat x, GLfloat y, GLfloat z, const wchar_t* s)
|
|
{
|
|
if(!advance_) glPushMatrix();
|
|
|
|
if(horizontal_justification_!= ORIGIN||vertical_justification_!= BASELINE)
|
|
{
|
|
glPushMatrix();
|
|
|
|
// In 3D, we need to exert more care in the computation of the
|
|
// bounding box of the text. NOTE: Needs to be fixed up for
|
|
// polygonal faces, too...
|
|
|
|
BBox bbox;
|
|
// Code from measure_nominal, but changed to use measureRaw instead
|
|
if(string_rotation_ == 0.) bbox = measureRaw(s);
|
|
else
|
|
{
|
|
for(unsigned int f=0; f<faces_.size(); f++)
|
|
FT_Set_Transform(faces_[f].face_, 0, 0);
|
|
|
|
bbox = measureRaw(s);
|
|
|
|
float angle;
|
|
if(string_rotation_<0.0)
|
|
angle = 360.0f - fmod(fabs(string_rotation_), 360.f);
|
|
else
|
|
angle = fmod(string_rotation_, 360.f);
|
|
|
|
FT_Matrix rotation_matrix;
|
|
FT_Vector sinus;
|
|
|
|
FT_Vector_Unit(&sinus, (FT_Angle)(angle * 0x10000L));
|
|
|
|
rotation_matrix.xx = sinus.x;
|
|
rotation_matrix.xy = -sinus.y;
|
|
rotation_matrix.yx = sinus.y;
|
|
rotation_matrix.yy = sinus.x;
|
|
|
|
for(unsigned int f=0; f<faces_.size(); f++)
|
|
FT_Set_Transform(faces_[f].face_, &rotation_matrix, 0);
|
|
}
|
|
|
|
GLfloat dx = 0, dy = 0;
|
|
|
|
switch (horizontal_justification_)
|
|
{
|
|
case LEFT:
|
|
dx = bbox.x_min_; break;
|
|
case CENTER:
|
|
dx = (bbox.x_min_ + bbox.x_max_)/ 2; break;
|
|
case RIGHT:
|
|
dx = bbox.x_max_; break;
|
|
default:
|
|
break;
|
|
}
|
|
switch (vertical_justification_)
|
|
{
|
|
case BOTTOM:
|
|
dy = bbox.y_min_; break;
|
|
case MIDDLE:
|
|
dy = (bbox.y_min_ + bbox.y_max_)/2; break;
|
|
case TOP:
|
|
dy = bbox.y_max_; break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
GLint viewport[4];
|
|
GLdouble modelview[16], projection[16];
|
|
|
|
glGetIntegerv(GL_VIEWPORT, viewport);
|
|
glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
|
|
glGetDoublev(GL_PROJECTION_MATRIX, projection);
|
|
|
|
GLdouble x0, y0, z0;
|
|
gluUnProject(0, 0, 0, modelview, projection, viewport, &x0, &y0, &z0);
|
|
|
|
GLdouble dx_m, dy_m, dz_m;
|
|
gluUnProject(dx, dy, 0., modelview, projection, viewport,&dx_m,&dy_m,&dz_m);
|
|
|
|
glTranslated(x0-dx_m, y0-dy_m, z0-dz_m);
|
|
}
|
|
|
|
glTranslatef(x, y, z);
|
|
glColor4f(foreground_color_[R], foreground_color_[G], foreground_color_[B], foreground_color_[A]);
|
|
glRasterPos3i(0, 0, 0);
|
|
draw(s);
|
|
|
|
if(horizontal_justification_!=ORIGIN||vertical_justification_!= BASELINE)
|
|
glPopMatrix();
|
|
|
|
if(!advance_)
|
|
glPopMatrix();
|
|
}
|
|
|
|
Raster::Raster (const char* filename, float point_size, FT_UInt resolution)
|
|
: Face(filename, point_size, resolution)
|
|
{
|
|
if(!isValid()) return;
|
|
|
|
init();
|
|
}
|
|
|
|
Raster::Raster (FT_Face face, float point_size, FT_UInt resolution)
|
|
: Face(face, point_size, resolution)
|
|
{
|
|
init();
|
|
}
|
|
|
|
void Raster::init (void)
|
|
{
|
|
character_rotation_z_ = 0;
|
|
setCharSize();
|
|
setCharacterRotationReference('o');
|
|
}
|
|
|
|
Raster::~Raster (void)
|
|
{
|
|
clearCaches();
|
|
}
|
|
|
|
void Raster::setCharacterRotationZ (GLfloat character_rotation_z)
|
|
{
|
|
if(character_rotation_z != character_rotation_z_)
|
|
{
|
|
character_rotation_z_ = character_rotation_z;
|
|
clearCaches();
|
|
}
|
|
}
|
|
|
|
double Raster::height (void)const
|
|
{
|
|
if(faces_[0].face_->height > 0) return faces_[0].face_->height / 64.;
|
|
else return faces_[0].face_->size->metrics.y_ppem;
|
|
}
|
|
|
|
BBox Raster::measure (unsigned char c)
|
|
{
|
|
BBox bbox;
|
|
|
|
// For starters, just get the unscaled glyph bounding box
|
|
unsigned int f;
|
|
FT_UInt glyph_index = 0;
|
|
|
|
for(f=0; f<faces_.size(); f++)
|
|
{
|
|
glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
|
|
if(glyph_index != 0) break;
|
|
}
|
|
|
|
if(glyph_index == 0) return bbox;
|
|
|
|
FT_Error error = FT_Load_Glyph(faces_[f].face_, glyph_index, FT_LOAD_DEFAULT);
|
|
if(error != 0) return bbox;
|
|
|
|
FT_Glyph glyph;
|
|
error = FT_Get_Glyph(faces_[f].face_->glyph, &glyph);
|
|
if(error != 0) return bbox;
|
|
|
|
FT_BBox ft_bbox;
|
|
FT_Glyph_Get_CBox(glyph, ft_glyph_bbox_unscaled, &ft_bbox);
|
|
|
|
FT_Done_Glyph(glyph);
|
|
|
|
bbox = ft_bbox;
|
|
bbox.advance_ = faces_[f].face_->glyph->advance;
|
|
|
|
// In order to be accurate regarding the placement of text not
|
|
// aligned at the glyph's origin (CENTER/MIDDLE), the bounding box
|
|
// of the raster format has to be projected back into the
|
|
// view's coordinates
|
|
GLint viewport[4];
|
|
GLdouble modelview[16], projection[16];
|
|
|
|
glGetIntegerv(GL_VIEWPORT, viewport);
|
|
glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
|
|
glGetDoublev(GL_PROJECTION_MATRIX, projection);
|
|
|
|
// Well, first we have to get the Origin, since that is the basis
|
|
// of the bounding box
|
|
GLdouble x0, y0, z0;
|
|
gluUnProject(0., 0., 0., modelview, projection, viewport, &x0, &y0, &z0);
|
|
|
|
GLdouble x, y, z;
|
|
gluUnProject(bbox.x_min_, bbox.y_min_, 0., modelview, projection, viewport, &x, &y, &z);
|
|
bbox.x_min_ = (float) (x - x0);
|
|
bbox.y_min_ = (float) (y - y0);
|
|
|
|
gluUnProject(bbox.x_max_, bbox.y_max_, 0., modelview, projection, viewport, &x, &y, &z);
|
|
bbox.x_max_ = (float) (x - x0);
|
|
bbox.y_max_ = (float) (y - y0);
|
|
|
|
gluUnProject(bbox.advance_.dx_, bbox.advance_.dy_, 0., modelview, projection, viewport, &x, &y, &z);
|
|
bbox.advance_.dx_ = (float) (x - x0);
|
|
bbox.advance_.dy_ = (float) (y - y0);
|
|
|
|
return bbox;
|
|
}
|
|
|
|
BBox Raster::measure (wchar_t c)
|
|
{
|
|
BBox bbox;
|
|
|
|
// For starters, just get the unscaled glyph bounding box
|
|
unsigned int f;
|
|
FT_UInt glyph_index = 0;
|
|
|
|
for(f=0; f<faces_.size(); f++)
|
|
{
|
|
glyph_index = FT_Get_Char_Index(faces_[f].face_, c);
|
|
if(glyph_index != 0) break;
|
|
}
|
|
|
|
if(glyph_index == 0) return bbox;
|
|
|
|
FT_Error error = FT_Load_Glyph(faces_[f].face_, glyph_index,
|
|
FT_LOAD_DEFAULT);
|
|
if(error != 0) return bbox;
|
|
|
|
FT_Glyph glyph;
|
|
error = FT_Get_Glyph(faces_[f].face_->glyph, &glyph);
|
|
if(error != 0) return bbox;
|
|
|
|
FT_BBox ft_bbox;
|
|
FT_Glyph_Get_CBox(glyph, ft_glyph_bbox_unscaled, &ft_bbox);
|
|
|
|
FT_Done_Glyph(glyph);
|
|
|
|
bbox = ft_bbox;
|
|
bbox.advance_ = faces_[f].face_->glyph->advance;
|
|
|
|
// In order to be accurate regarding the placement of text not
|
|
// aligned at the glyph's origin (CENTER/MIDDLE), the bounding box
|
|
// of the raster format has to be projected back into the
|
|
// view's coordinates
|
|
GLint viewport[4];
|
|
GLdouble modelview[16], projection[16];
|
|
|
|
glGetIntegerv(GL_VIEWPORT, viewport);
|
|
glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
|
|
glGetDoublev(GL_PROJECTION_MATRIX, projection);
|
|
|
|
// Well, first we have to get the Origin, since that is the basis
|
|
// of the bounding box
|
|
GLdouble x0, y0, z0;
|
|
gluUnProject(0., 0., 0., modelview, projection, viewport, &x0, &y0, &z0);
|
|
|
|
GLdouble x, y, z;
|
|
gluUnProject(bbox.x_min_, bbox.y_min_, 0., modelview, projection, viewport, &x, &y, &z);
|
|
bbox.x_min_ = (float) (x - x0);
|
|
bbox.y_min_ = (float) (y - y0);
|
|
|
|
gluUnProject(bbox.x_max_, bbox.y_max_, 0., modelview, projection, viewport, &x, &y, &z);
|
|
bbox.x_max_ = (float) (x - x0);
|
|
bbox.y_max_ = (float) (y - y0);
|
|
|
|
gluUnProject(bbox.advance_.dx_, bbox.advance_.dy_, 0., modelview, projection, viewport, &x, &y, &z);
|
|
bbox.advance_.dx_ = (float) (x - x0);
|
|
bbox.advance_.dy_ = (float) (y - y0);
|
|
|
|
return bbox;
|
|
}
|
|
|
|
GLuint Raster::compileGlyph (FT_Face face, FT_UInt glyph_index)
|
|
{
|
|
GLuint dlist = glGenLists(1);
|
|
glNewList(dlist, GL_COMPILE);
|
|
|
|
renderGlyph(face, glyph_index);
|
|
|
|
glEndList();
|
|
|
|
return dlist;
|
|
}
|
|
|
|
void Raster::setCharSize (void)
|
|
{
|
|
FT_Error error;
|
|
for(unsigned int i=0; i<faces_.size(); i++)
|
|
{
|
|
error = FT_Set_Char_Size(faces_[i].face_,(FT_F26Dot6)(point_size_ * 64),(FT_F26Dot6)(point_size_ * 64),resolution_,resolution_);
|
|
if(error != 0) return;
|
|
}
|
|
|
|
if(rotation_reference_glyph_ != 0) setRotationOffset();
|
|
}
|
|
|
|
void Raster::setRotationOffset (void)
|
|
{
|
|
FT_Error error = FT_Load_Glyph(rotation_reference_face_, rotation_reference_glyph_, FT_LOAD_RENDER);
|
|
|
|
if(error != 0) return;
|
|
|
|
rotation_offset_y_ = rotation_reference_face_->glyph->bitmap.rows / 2.0f;
|
|
}
|
|
|
|
void Raster::clearCaches (void)
|
|
{
|
|
GDLI fgi = glyph_dlists_.begin();
|
|
|
|
for(; fgi != glyph_dlists_.end(); ++fgi)
|
|
{
|
|
glDeleteLists(fgi->second, 1);
|
|
}
|
|
|
|
glyph_dlists_.clear();
|
|
}
|
|
|
|
Monochrome::Monochrome (const char* filename, float point_size, FT_UInt resolution)
|
|
: Raster(filename, point_size, resolution)
|
|
{
|
|
return;
|
|
}
|
|
|
|
Monochrome::Monochrome (FT_Face face, float point_size, FT_UInt resolution)
|
|
: Raster(face, point_size, resolution)
|
|
{
|
|
return;
|
|
}
|
|
|
|
Monochrome::~Monochrome (void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
GLubyte* Monochrome::invertBitmap (const FT_Bitmap& bitmap)
|
|
{
|
|
// In FreeType 2.0.9, the pitch of bitmaps was rounded up to an
|
|
// even number. In general, this disagrees with what we had been
|
|
// using for OpenGL.
|
|
int width = bitmap.width / 8 + ((bitmap.width & 7)> 0 ? 1 : 0);
|
|
|
|
GLubyte* inverse = new GLubyte[ bitmap.rows * width ];
|
|
GLubyte* inverse_ptr = inverse;
|
|
|
|
for(unsigned int r=0; r<bitmap.rows; r++)
|
|
{
|
|
GLubyte* bitmap_ptr = &bitmap.buffer[bitmap.pitch * (bitmap.rows - r - 1)];
|
|
|
|
memmove(inverse_ptr, bitmap_ptr, width);
|
|
inverse_ptr += width;
|
|
bitmap_ptr += width;
|
|
}
|
|
|
|
return inverse;
|
|
}
|
|
|
|
void Monochrome::renderGlyph (FT_Face face, FT_UInt glyph_index)
|
|
{
|
|
// Start by retrieving the glyph's data.
|
|
FT_Error error = FT_Load_Glyph(face, glyph_index, FT_LOAD_DEFAULT);
|
|
|
|
if(error != 0) return;
|
|
|
|
FT_Glyph original_glyph;
|
|
FT_Glyph glyph;
|
|
|
|
error = FT_Get_Glyph(face->glyph, &original_glyph);
|
|
|
|
if(error != 0) return;
|
|
|
|
error = FT_Glyph_Copy(original_glyph, &glyph);
|
|
|
|
FT_Done_Glyph(original_glyph);
|
|
|
|
if(error != 0) return;
|
|
|
|
// If the individual characters are rotated (as distinct from string
|
|
// rotation), then apply that extra rotation here. This is equivalent
|
|
// to the sequence
|
|
// glTranslate(x_center,y_center);
|
|
// glRotate(angle);
|
|
// glTranslate(-x_center,-y_center);
|
|
// which is used for the polygonal styles. The deal with the raster
|
|
// styles is that you must retain the advance from the string rotation
|
|
// so that the glyphs are laid out properly. So, we make a copy of
|
|
// the string rotated glyph, and then rotate that and add back an
|
|
// additional offset to (in effect) restore the proper origin and
|
|
// advance of the glyph.
|
|
|
|
if(character_rotation_z_ != 0.)
|
|
{
|
|
FT_Matrix rotation_matrix;
|
|
FT_Vector sinus;
|
|
|
|
FT_Vector_Unit(&sinus, (FT_Angle)(character_rotation_z_ * 0x10000L));
|
|
|
|
rotation_matrix.xx = sinus.x;
|
|
rotation_matrix.xy = -sinus.y;
|
|
rotation_matrix.yx = sinus.y;
|
|
rotation_matrix.yy = sinus.x;
|
|
|
|
FT_Vector original_offset, rotation_offset;
|
|
|
|
original_offset.x = (face->glyph->metrics.width / 2 + face->glyph->metrics.horiBearingX)/ 64 * 0x10000L;
|
|
original_offset.y = (FT_Pos)(rotation_offset_y_ * 0x10000L);
|
|
|
|
rotation_offset = original_offset;
|
|
|
|
FT_Vector_Rotate(&rotation_offset, (FT_Angle)(character_rotation_z_ * 0x10000L));
|
|
|
|
rotation_offset.x = original_offset.x - rotation_offset.x;
|
|
rotation_offset.y = original_offset.y - rotation_offset.y;
|
|
|
|
rotation_offset.x /= 1024;
|
|
rotation_offset.y /= 1024;
|
|
|
|
error = FT_Glyph_Transform(glyph, &rotation_matrix, &rotation_offset);
|
|
}
|
|
|
|
error = FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_MONO, 0, 1);
|
|
|
|
if(error != 0)
|
|
{
|
|
FT_Done_Glyph(glyph);
|
|
return;
|
|
}
|
|
|
|
FT_BitmapGlyph bitmap_glyph = (FT_BitmapGlyph) glyph;
|
|
|
|
// Evidently, in FreeType2, you can only get "upside-down" bitmaps and
|
|
// OpenGL won't invert a bitmap with PixelZoom, so we have to invert the
|
|
// glyph's bitmap ourselves.
|
|
|
|
GLubyte* inverted_bitmap = invertBitmap(bitmap_glyph->bitmap);
|
|
|
|
glBitmap(bitmap_glyph->bitmap.width, bitmap_glyph->bitmap.rows,
|
|
(GLfloat) -bitmap_glyph->left,
|
|
(GLfloat) (bitmap_glyph->bitmap.rows - bitmap_glyph->top),
|
|
face->glyph->advance.x / 64.0f,
|
|
face->glyph->advance.y / 64.0f,
|
|
inverted_bitmap);
|
|
|
|
FT_Done_Glyph(glyph);
|
|
|
|
delete[] inverted_bitmap;
|
|
}
|
|
|
|
} // close OGLFT namespace
|
|
|