1 | /*-------------------------------------------------------------------------
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2 | This source file is a part of OGRE
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3 | (Object-oriented Graphics Rendering Engine)
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4 |
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5 | For the latest info, see http://www.ogre3d.org/
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6 |
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7 | Copyright (c) 2000-2005 The OGRE Team
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8 | Also see acknowledgements in Readme.html
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9 |
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10 | This library is free software; you can redistribute it and/or modify it
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11 | under the terms of the GNU Lesser General Public License (LGPL) as
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12 | published by the Free Software Foundation; either version 2.1 of the
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13 | License, or (at your option) any later version.
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14 |
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15 | This library is distributed in the hope that it will be useful, but
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16 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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17 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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18 | License for more details.
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19 |
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20 | You should have received a copy of the GNU Lesser General Public License
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21 | along with this library; if not, write to the Free Software Foundation,
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22 | Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA or go to
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23 | http://www.gnu.org/copyleft/lesser.txt
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24 | -------------------------------------------------------------------------*/
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25 | #include "OgreStableHeaders.h"
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26 |
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27 | #include "OgreFont.h"
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28 | #include "OgreMaterialManager.h"
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29 | #include "OgreTextureManager.h"
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30 | #include "OgreTexture.h"
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31 | #include "OgreResourceGroupManager.h"
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32 | #include "OgreLogManager.h"
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33 | #include "OgreStringConverter.h"
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34 | #include "OgreRenderWindow.h"
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35 | #include "OgreException.h"
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36 | #include "OgreBlendMode.h"
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37 | #include "OgreTextureUnitState.h"
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38 | #include "OgreTechnique.h"
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39 | #include "OgrePass.h"
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40 | #include "OgreMaterial.h"
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41 | #include <ft2build.h>
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42 | #include FT_FREETYPE_H
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43 | #include FT_GLYPH_H
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44 |
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45 |
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46 |
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47 | namespace Ogre
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48 | {
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49 | //---------------------------------------------------------------------
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50 | Font::CmdType Font::msTypeCmd;
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51 | Font::CmdSource Font::msSourceCmd;
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52 | Font::CmdSize Font::msSizeCmd;
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53 | Font::CmdResolution Font::msResolutionCmd;
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54 |
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55 | //---------------------------------------------------------------------
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56 | Font::Font(ResourceManager* creator, const String& name, ResourceHandle handle,
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57 | const String& group, bool isManual, ManualResourceLoader* loader)
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58 | :Resource (creator, name, handle, group, isManual, loader),
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59 | mType(FT_TRUETYPE), mTtfSize(0), mTtfResolution(0), mAntialiasColour(false)
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60 | {
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61 |
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62 | if (createParamDictionary("Font"))
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63 | {
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64 | ParamDictionary* dict = getParamDictionary();
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65 | dict->addParameter(
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66 | ParameterDef("type", "'truetype' or 'image' based font", PT_STRING),
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67 | &msTypeCmd);
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68 | dict->addParameter(
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69 | ParameterDef("source", "Filename of the source of the font.", PT_STRING),
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70 | &msSourceCmd);
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71 | dict->addParameter(
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72 | ParameterDef("size", "True type size", PT_REAL),
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73 | &msSizeCmd);
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74 | dict->addParameter(
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75 | ParameterDef("resolution", "True type resolution", PT_UNSIGNED_INT),
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76 | &msResolutionCmd);
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77 | }
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78 |
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79 | }
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80 | //---------------------------------------------------------------------
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81 | Font::~Font()
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82 | {
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83 | // have to call this here reather than in Resource destructor
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84 | // since calling virtual methods in base destructors causes crash
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85 | unload();
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86 | }
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87 | //---------------------------------------------------------------------
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88 | void Font::setType(FontType ftype)
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89 | {
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90 | mType = ftype;
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91 | }
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92 | //---------------------------------------------------------------------
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93 | FontType Font::getType(void) const
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94 | {
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95 | return mType;
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96 | }
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97 | //---------------------------------------------------------------------
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98 | void Font::setSource(const String& source)
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99 | {
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100 | mSource = source;
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101 | }
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102 | //---------------------------------------------------------------------
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103 | void Font::setTrueTypeSize(Real ttfSize)
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104 | {
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105 | mTtfSize = ttfSize;
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106 | }
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107 | //---------------------------------------------------------------------
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108 | void Font::setTrueTypeResolution(uint ttfResolution)
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109 | {
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110 | mTtfResolution = ttfResolution;
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111 | }
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112 | //---------------------------------------------------------------------
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113 | const String& Font::getSource(void) const
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114 | {
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115 | return mSource;
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116 | }
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117 | //---------------------------------------------------------------------
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118 | Real Font::getTrueTypeSize(void) const
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119 | {
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120 | return mTtfSize;
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121 | }
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122 | //---------------------------------------------------------------------
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123 | uint Font::getTrueTypeResolution(void) const
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124 | {
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125 | return mTtfResolution;
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126 | }
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127 | //---------------------------------------------------------------------
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128 | std::pair< uint, uint > Font::StrBBox( const String & text, Real char_height, RenderWindow & window )
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129 | {
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130 | std::pair< uint, uint > ret( 0, 0 );
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131 | Real vsX, vsY;
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132 | unsigned int w, h;
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133 |
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134 | // These are not used, but are required byt the function calls.
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135 | unsigned int cdepth;
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136 | int left, top;
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137 |
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138 | window.getMetrics( w, h, cdepth, left, top );
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139 |
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140 | for( uint i = 0; i < text.length(); i++ )
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141 | {
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142 | // Calculate view-space width and height of char
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143 | vsY = char_height;
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144 | if (text[i] == ' ') // assume capital A is space width
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145 | vsX = getGlyphAspectRatio( 'A' ) * char_height;
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146 | else
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147 | vsX = getGlyphAspectRatio( text[ i ] ) * char_height;
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148 |
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149 | ret.second += vsX * w;
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150 | if( vsY * h > ret.first || ( i && text[ i - 1 ] == '\n' ) )
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151 | ret.first += vsY * h;
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152 | }
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153 |
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154 | return ret;
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155 | }
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156 | //---------------------------------------------------------------------
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157 | void Font::loadImpl()
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158 | {
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159 | // Create a new material
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160 | mpMaterial = MaterialManager::getSingleton().create(
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161 | "Fonts/" + mName, mGroup);
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162 |
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163 | if (mpMaterial.isNull())
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164 | {
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165 | OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR,
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166 | "Error creating new material!", "Font::load" );
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167 | }
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168 |
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169 | TextureUnitState *texLayer;
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170 | bool blendByAlpha = true;
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171 | if (mType == FT_TRUETYPE)
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172 | {
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173 | createTextureFromFont();
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174 | texLayer = mpMaterial->getTechnique(0)->getPass(0)->getTextureUnitState(0);
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175 | // Always blend by alpha
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176 | blendByAlpha = true;
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177 | }
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178 | else
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179 | {
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180 | // Manually load since we need to load to get alpha
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181 | mTexture = TextureManager::getSingleton().load(mSource, mGroup, TEX_TYPE_2D, 0);
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182 | blendByAlpha = mTexture->hasAlpha();
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183 | texLayer = mpMaterial->getTechnique(0)->getPass(0)->createTextureUnitState(mSource);
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184 | }
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185 | // Clamp to avoid fuzzy edges
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186 | texLayer->setTextureAddressingMode( TextureUnitState::TAM_CLAMP );
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187 | // Allow min/mag filter, but no mip
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188 | texLayer->setTextureFiltering(FO_LINEAR, FO_LINEAR, FO_NONE);
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189 |
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190 |
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191 | // Set up blending
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192 | if (blendByAlpha)
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193 | {
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194 | mpMaterial->setSceneBlending( SBT_TRANSPARENT_ALPHA );
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195 | }
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196 | else
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197 | {
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198 | // Use add if no alpha (assume black background)
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199 | mpMaterial->setSceneBlending(SBT_ADD);
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200 | }
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201 | }
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202 | //---------------------------------------------------------------------
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203 | void Font::unloadImpl()
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204 | {
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205 | // Cascade to the texture we created
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206 | mTexture->unload();
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207 | }
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208 | //---------------------------------------------------------------------
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209 | void Font::createTextureFromFont(void)
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210 | {
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211 |
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212 | // Just create the texture here, and point it at ourselves for when
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213 | // it wants to (re)load for real
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214 | String texName = mName + "Texture";
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215 | // Create, setting isManual to true and passing self as loader
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216 | mTexture = TextureManager::getSingleton().create(
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217 | texName, mGroup, true, this);
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218 | mTexture->setTextureType(TEX_TYPE_2D);
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219 | mTexture->setNumMipmaps(0);
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220 | mTexture->load();
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221 |
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222 | TextureUnitState* t = mpMaterial->getTechnique(0)->getPass(0)->createTextureUnitState( texName );
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223 | // Allow min/mag filter, but no mip
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224 | t->setTextureFiltering(FO_LINEAR, FO_LINEAR, FO_NONE);
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225 |
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226 | }
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227 | //---------------------------------------------------------------------
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228 | void Font::loadResource(Resource* res)
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229 | {
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230 | // ManualResourceLoader implementation - load the texture
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231 | FT_Library ftLibrary;
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232 | // Init freetype
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233 | if( FT_Init_FreeType( &ftLibrary ) )
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234 | OGRE_EXCEPT( Exception::ERR_INTERNAL_ERROR, "Could not init FreeType library!",
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235 | "Font::Font");
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236 |
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237 | uint i, l, m, n;
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238 | int j, k;
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239 |
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240 | FT_Face face;
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241 | // Add a gap between letters vert and horz
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242 | // prevents nasty artefacts when letters are too close together
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243 | uint char_spacer = 5;
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244 |
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245 | // Locate ttf file, load it pre-buffered into memory by wrapping the
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246 | // original DataStream in a MemoryDataStream
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247 | DataStreamPtr dataStreamPtr =
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248 | ResourceGroupManager::getSingleton().openResource(
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249 | mSource, mGroup, true, this);
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250 | MemoryDataStream ttfchunk(dataStreamPtr);
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251 |
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252 | // Load font
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253 | if( FT_New_Memory_Face( ftLibrary, ttfchunk.getPtr(), (FT_Long)ttfchunk.size() , 0, &face ) )
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254 | OGRE_EXCEPT( Exception::ERR_INTERNAL_ERROR,
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255 | "Could not open font face!", "Font::createTextureFromFont" );
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256 |
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257 |
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258 | // Convert our point size to freetype 26.6 fixed point format
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259 | FT_F26Dot6 ftSize = (FT_F26Dot6)(mTtfSize * (1 << 6));
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260 | if( FT_Set_Char_Size( face, ftSize, 0, mTtfResolution, mTtfResolution ) )
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261 | OGRE_EXCEPT( Exception::ERR_INTERNAL_ERROR,
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262 | "Could not set char size!", "Font::createTextureFromFont" );
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263 |
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264 | //FILE *fo_def = stdout;
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265 |
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266 | int max_height = 0, max_width = 0, max_bear = 0;
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267 |
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268 | uint startGlyph = 33;
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269 | uint endGlyph = 167;
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270 |
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271 | // Calculate maximum width, height and bearing
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272 | for( i = startGlyph, l = 0, m = 0, n = 0; i < endGlyph; i++ )
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273 | {
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274 | FT_Load_Char( face, i, FT_LOAD_RENDER );
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275 |
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276 | if( ( 2 * ( face->glyph->bitmap.rows << 6 ) - face->glyph->metrics.horiBearingY ) > max_height )
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277 | max_height = ( 2 * ( face->glyph->bitmap.rows << 6 ) - face->glyph->metrics.horiBearingY );
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278 | if( face->glyph->metrics.horiBearingY > max_bear )
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279 | max_bear = face->glyph->metrics.horiBearingY;
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280 |
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281 | if( (face->glyph->advance.x >> 6 ) + ( face->glyph->metrics.horiBearingX >> 6 ) > max_width)
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282 | max_width = (face->glyph->advance.x >> 6 ) + ( face->glyph->metrics.horiBearingX >> 6 );
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283 | }
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284 |
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285 | // Now work out how big our texture needs to be
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286 | size_t rawSize = (max_width + char_spacer) *
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287 | ((max_height >> 6) + char_spacer) *
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288 | (endGlyph - startGlyph + 1);
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289 |
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290 | size_t tex_side = Math::Sqrt(rawSize);
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291 | // just in case the size might chop a glyph in half, add another glyph width/height
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292 | tex_side += std::max(max_width, (max_height>>6));
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293 | // Now round up to nearest power of two, max out at 4096
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294 | size_t roundUpSize = 0;
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295 | for (i = 0; i < 12 && roundUpSize < tex_side; ++i)
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296 | #if OGRE_COMPILER == OGRE_COMPILER_MSVC && OGRE_ARCH_TYPE == OGRE_ARCHITECTURE_64
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297 | roundUpSize = 1i64 << i;// 64-bit shift otherwise we get a C4334 warning
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298 | #else
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299 | roundUpSize = 1 << i;
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300 | #endif
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301 |
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302 | tex_side = roundUpSize;
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303 | const size_t pixel_bytes = 2;
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304 | size_t data_width = tex_side * pixel_bytes;
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305 |
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306 | LogManager::getSingleton().logMessage("Font " + mName + "using texture size " +
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307 | StringConverter::toString(tex_side) + "x" + StringConverter::toString(tex_side));
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308 |
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309 | uchar* imageData = new uchar[tex_side * tex_side * pixel_bytes];
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310 | // Reset content (White, transparent)
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311 | for (i = 0; i < tex_side * tex_side * pixel_bytes; i += pixel_bytes)
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312 | {
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313 | imageData[i + 0] = 0xFF; // luminance
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314 | imageData[i + 1] = 0x00; // alpha
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315 | }
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316 |
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317 | for( i = startGlyph, l = 0, m = 0, n = 0; i < endGlyph; i++ )
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318 | {
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319 | FT_Error ftResult;
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320 |
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321 | // Load & render glyph
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322 | ftResult = FT_Load_Char( face, i, FT_LOAD_RENDER );
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323 | if (ftResult)
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324 | {
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325 | // problem loading this glyph, continue
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326 | LogManager::getSingleton().logMessage("Info: cannot load character " +
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327 | StringConverter::toString(i) + " in font " + mName);
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328 | continue;
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329 | }
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330 |
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331 | FT_Int advance = (face->glyph->advance.x >> 6 ) + ( face->glyph->metrics.horiBearingX >> 6 );
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332 |
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333 | unsigned char* buffer = face->glyph->bitmap.buffer;
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334 |
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335 | if (!buffer)
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336 | {
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337 | // Yuck, FT didn't detect this but generated a null pointer!
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338 | LogManager::getSingleton().logMessage("Info: Freetype returned null for character " +
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339 | StringConverter::toString(i) + " in font " + mName);
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340 | continue;
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341 | }
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342 |
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343 | int y_bearnig = ( max_bear >> 6 ) - ( face->glyph->metrics.horiBearingY >> 6 );
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344 |
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345 | for( j = 0; j < face->glyph->bitmap.rows; j++ )
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346 | {
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347 | int row = j + m + y_bearnig;
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348 | uchar* pDest = &imageData[(row * data_width) + l * pixel_bytes];
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349 | for( k = 0; k < face->glyph->bitmap.width; k++ )
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350 | {
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351 | if (mAntialiasColour)
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352 | {
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353 | // Use the same greyscale pixel for all components RGBA
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354 | *pDest++= *buffer;
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355 | }
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356 | else
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357 | {
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358 | // Always white whether 'on' or 'off' pixel, since alpha
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359 | // will turn off
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360 | *pDest++= 0xFF;
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361 | }
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362 | // Always use the greyscale value for alpha
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363 | *pDest++= *buffer++; }
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364 | }
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365 |
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366 | this->setGlyphTexCoords( i,
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367 | (Real)l / (Real)tex_side, // u1
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368 | (Real)m / (Real)tex_side, // v1
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369 | (Real)( l + ( face->glyph->advance.x >> 6 ) ) / (Real)tex_side, // u2
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370 | ( m + ( max_height >> 6 ) ) / (Real)tex_side // v2
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371 | );
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372 |
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373 | // Advance a column
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374 | l += (advance + char_spacer);
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375 |
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376 | // If at end of row
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377 | if( tex_side - 1 < l + ( advance ) )
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378 | {
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379 | m += ( max_height >> 6 ) + char_spacer;
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380 | l = n = 0;
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381 | }
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382 | }
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383 |
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384 | DataStreamPtr memStream(
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385 | new MemoryDataStream(imageData, tex_side * tex_side * pixel_bytes, true));
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386 |
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387 | Image img;
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388 | img.loadRawData( memStream, tex_side, tex_side, PF_BYTE_LA );
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389 |
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390 | Texture* tex = static_cast<Texture*>(res);
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391 | tex->loadImage(img);
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392 |
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393 |
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394 | FT_Done_FreeType(ftLibrary);
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395 | }
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396 | //-----------------------------------------------------------------------
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397 | //-----------------------------------------------------------------------
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398 | String Font::CmdType::doGet(const void* target) const
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399 | {
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400 | const Font* f = static_cast<const Font*>(target);
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401 | if (f->getType() == FT_TRUETYPE)
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402 | {
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403 | return "truetype";
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404 | }
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405 | else
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406 | {
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407 | return "image";
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408 | }
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409 | }
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410 | void Font::CmdType::doSet(void* target, const String& val)
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411 | {
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412 | Font* f = static_cast<Font*>(target);
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413 | if (val == "truetype")
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414 | {
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415 | f->setType(FT_TRUETYPE);
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416 | }
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417 | else
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418 | {
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419 | f->setType(FT_IMAGE);
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420 | }
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421 | }
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422 | //-----------------------------------------------------------------------
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423 | String Font::CmdSource::doGet(const void* target) const
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424 | {
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425 | const Font* f = static_cast<const Font*>(target);
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426 | return f->getSource();
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427 | }
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428 | void Font::CmdSource::doSet(void* target, const String& val)
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429 | {
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430 | Font* f = static_cast<Font*>(target);
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431 | f->setSource(val);
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432 | }
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433 | //-----------------------------------------------------------------------
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434 | String Font::CmdSize::doGet(const void* target) const
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435 | {
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436 | const Font* f = static_cast<const Font*>(target);
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437 | return StringConverter::toString(f->getTrueTypeSize());
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438 | }
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439 | void Font::CmdSize::doSet(void* target, const String& val)
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440 | {
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441 | Font* f = static_cast<Font*>(target);
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442 | f->setTrueTypeSize(StringConverter::parseReal(val));
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443 | }
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444 | //-----------------------------------------------------------------------
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445 | String Font::CmdResolution::doGet(const void* target) const
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446 | {
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447 | const Font* f = static_cast<const Font*>(target);
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448 | return StringConverter::toString(f->getTrueTypeResolution());
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449 | }
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450 | void Font::CmdResolution::doSet(void* target, const String& val)
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451 | {
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452 | Font* f = static_cast<Font*>(target);
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453 | f->setTrueTypeResolution(StringConverter::parseUnsignedInt(val));
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454 | }
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455 |
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456 |
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457 | }
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