[692] | 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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