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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtGui module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 #ifndef QFONTENGINE_FT_P_H |
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42 #define QFONTENGINE_FT_P_H |
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43 // |
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44 // W A R N I N G |
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45 // ------------- |
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46 // |
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47 // This file is not part of the Qt API. It exists purely as an |
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48 // implementation detail. This header file may change from version to |
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49 // version without notice, or even be removed. |
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50 // |
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51 // We mean it. |
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52 // |
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53 |
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54 #include "qfontengine_p.h" |
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55 |
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56 #ifndef QT_NO_FREETYPE |
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57 |
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58 #include <ft2build.h> |
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59 #include FT_FREETYPE_H |
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60 |
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61 #if defined(Q_WS_X11) |
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62 #include <private/qt_x11_p.h> |
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63 #endif |
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64 |
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65 #include <unistd.h> |
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66 |
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67 #ifndef QT_NO_FONTCONFIG |
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68 #include <fontconfig/fontconfig.h> |
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69 #endif |
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70 |
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71 #include <qmutex.h> |
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72 |
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73 #include <harfbuzz-shaper.h> |
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74 |
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75 QT_BEGIN_NAMESPACE |
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76 |
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77 /* |
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78 * This struct represents one font file on disk (like Arial.ttf) and is shared between all the font engines |
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79 * that show this font file (at different pixel sizes). |
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80 */ |
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81 struct QFreetypeFace |
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82 { |
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83 void computeSize(const QFontDef &fontDef, int *xsize, int *ysize, bool *outline_drawing); |
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84 QFontEngine::Properties properties() const; |
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85 bool getSfntTable(uint tag, uchar *buffer, uint *length) const; |
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86 |
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87 static QFreetypeFace *getFace(const QFontEngine::FaceId &face_id); |
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88 void release(const QFontEngine::FaceId &face_id); |
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89 |
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90 // locks the struct for usage. Any read/write operations require locking. |
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91 void lock() |
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92 { |
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93 _lock.lock(); |
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94 } |
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95 void unlock() |
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96 { |
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97 _lock.unlock(); |
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98 } |
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99 |
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100 FT_Face face; |
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101 HB_Face hbFace; |
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102 #ifndef QT_NO_FONTCONFIG |
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103 FcCharSet *charset; |
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104 #endif |
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105 int xsize; // 26.6 |
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106 int ysize; // 26.6 |
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107 FT_Matrix matrix; |
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108 FT_CharMap unicode_map; |
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109 FT_CharMap symbol_map; |
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110 |
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111 enum { cmapCacheSize = 0x200 }; |
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112 glyph_t cmapCache[cmapCacheSize]; |
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113 |
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114 int fsType() const; |
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115 |
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116 HB_Error getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints); |
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117 |
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118 static void addGlyphToPath(FT_Face face, FT_GlyphSlot g, const QFixedPoint &point, QPainterPath *path, FT_Fixed x_scale, FT_Fixed y_scale); |
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119 static void addBitmapToPath(FT_GlyphSlot slot, const QFixedPoint &point, QPainterPath *path, bool = false); |
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120 |
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121 private: |
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122 friend class QScopedPointerDeleter<QFreetypeFace>; |
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123 QFreetypeFace() : _lock(QMutex::Recursive) {} |
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124 ~QFreetypeFace() {} |
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125 QAtomicInt ref; |
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126 QMutex _lock; |
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127 QByteArray fontData; |
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128 }; |
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129 |
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130 class Q_GUI_EXPORT QFontEngineFT : public QFontEngine |
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131 { |
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132 public: |
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133 enum GlyphFormat { |
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134 Format_None, |
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135 Format_Render = Format_None, |
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136 Format_Mono, |
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137 Format_A8, |
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138 Format_A32 |
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139 }; |
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140 |
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141 /* we don't cache glyphs that are too large anyway, so we can make this struct rather small */ |
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142 struct Glyph { |
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143 ~Glyph(); |
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144 short linearAdvance; |
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145 unsigned char width; |
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146 unsigned char height; |
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147 signed char x; |
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148 signed char y; |
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149 signed char advance; |
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150 signed char format; |
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151 uchar *data; |
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152 unsigned int uploadedToServer : 1; |
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153 }; |
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154 |
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155 enum SubpixelAntialiasingType { |
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156 Subpixel_None, |
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157 Subpixel_RGB, |
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158 Subpixel_BGR, |
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159 Subpixel_VRGB, |
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160 Subpixel_VBGR |
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161 }; |
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162 |
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163 #if defined(Q_WS_X11) && !defined(QT_NO_XRENDER) |
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164 typedef XGlyphInfo GlyphInfo; |
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165 #else |
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166 struct GlyphInfo { |
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167 unsigned short width; |
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168 unsigned short height; |
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169 short x; |
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170 short y; |
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171 short xOff; |
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172 short yOff; |
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173 }; |
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174 #endif |
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175 |
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176 struct QGlyphSet |
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177 { |
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178 QGlyphSet(); |
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179 ~QGlyphSet(); |
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180 FT_Matrix transformationMatrix; |
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181 unsigned long id; // server sided id, GlyphSet for X11 |
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182 bool outline_drawing; |
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183 mutable QHash<int, Glyph *> glyph_data; // maps from glyph index to glyph data |
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184 }; |
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185 |
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186 virtual QFontEngine::FaceId faceId() const; |
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187 virtual QFontEngine::Properties properties() const; |
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188 virtual QFixed emSquareSize() const; |
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189 |
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190 virtual bool getSfntTableData(uint tag, uchar *buffer, uint *length) const; |
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191 virtual int synthesized() const; |
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192 |
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193 virtual QFixed ascent() const; |
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194 virtual QFixed descent() const; |
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195 virtual QFixed leading() const; |
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196 virtual QFixed xHeight() const; |
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197 virtual QFixed averageCharWidth() const; |
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198 |
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199 virtual qreal maxCharWidth() const; |
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200 virtual qreal minLeftBearing() const; |
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201 virtual qreal minRightBearing() const; |
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202 virtual QFixed lineThickness() const; |
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203 virtual QFixed underlinePosition() const; |
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204 |
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205 void doKerning(QGlyphLayout *, QTextEngine::ShaperFlags) const; |
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206 |
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207 inline virtual Type type() const |
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208 { return QFontEngine::Freetype; } |
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209 inline virtual const char *name() const |
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210 { return "freetype"; } |
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211 |
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212 virtual void getUnscaledGlyph(glyph_t glyph, QPainterPath *path, glyph_metrics_t *metrics); |
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213 |
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214 virtual bool canRender(const QChar *string, int len); |
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215 |
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216 virtual void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs, |
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217 QPainterPath *path, QTextItem::RenderFlags flags); |
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218 virtual void addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, |
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219 QPainterPath *path, QTextItem::RenderFlags flags); |
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220 |
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221 virtual bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, |
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222 QTextEngine::ShaperFlags flags) const; |
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223 |
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224 virtual glyph_metrics_t boundingBox(const QGlyphLayout &glyphs); |
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225 virtual glyph_metrics_t boundingBox(glyph_t glyph); |
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226 virtual glyph_metrics_t boundingBox(glyph_t glyph, const QTransform &matrix); |
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227 |
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228 virtual void recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const; |
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229 virtual QImage alphaMapForGlyph(glyph_t); |
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230 virtual QImage alphaRGBMapForGlyph(glyph_t, int margin, const QTransform &t); |
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231 virtual void removeGlyphFromCache(glyph_t glyph); |
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232 |
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233 virtual int glyphCount() const; |
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234 |
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235 enum Scaling { |
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236 Scaled, |
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237 Unscaled |
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238 }; |
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239 FT_Face lockFace(Scaling scale = Scaled) const; |
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240 void unlockFace() const; |
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241 |
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242 FT_Face non_locked_face() const; |
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243 |
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244 inline bool drawAntialiased() const { return antialias; } |
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245 inline bool invalid() const { return xsize == 0 && ysize == 0; } |
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246 inline bool isBitmapFont() const { return defaultFormat == Format_Mono; } |
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247 |
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248 inline Glyph *loadGlyph(uint glyph, GlyphFormat format = Format_None, bool fetchMetricsOnly = false) const |
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249 { return loadGlyph(&defaultGlyphSet, glyph, format, fetchMetricsOnly); } |
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250 Glyph *loadGlyph(QGlyphSet *set, uint glyph, GlyphFormat = Format_None, bool fetchMetricsOnly = false) const; |
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251 |
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252 QGlyphSet *defaultGlyphs() { return &defaultGlyphSet; } |
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253 GlyphFormat defaultGlyphFormat() const { return defaultFormat; } |
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254 |
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255 inline Glyph *cachedGlyph(glyph_t g) const { return defaultGlyphSet.glyph_data.value(g); } |
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256 |
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257 QGlyphSet *loadTransformedGlyphSet(const QTransform &matrix); |
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258 bool loadGlyphs(QGlyphSet *gs, glyph_t *glyphs, int num_glyphs, GlyphFormat format = Format_Render); |
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259 |
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260 #if defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN) |
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261 virtual void draw(QPaintEngine * /*p*/, qreal /*x*/, qreal /*y*/, const QTextItemInt & /*si*/) {} |
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262 #endif |
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263 |
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264 QFontEngineFT(const QFontDef &fd); |
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265 virtual ~QFontEngineFT(); |
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266 |
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267 bool init(FaceId faceId, bool antiaalias, GlyphFormat defaultFormat = Format_None); |
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268 |
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269 virtual HB_Error getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints); |
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270 |
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271 protected: |
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272 |
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273 void freeGlyphSets(); |
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274 |
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275 virtual bool uploadGlyphToServer(QGlyphSet *set, uint glyphid, Glyph *g, GlyphInfo *info, int glyphDataSize) const; |
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276 virtual unsigned long allocateServerGlyphSet(); |
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277 virtual void freeServerGlyphSet(unsigned long id); |
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278 |
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279 QFreetypeFace *freetype; |
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280 int default_load_flags; |
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281 |
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282 enum HintStyle { |
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283 HintNone, |
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284 HintLight, |
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285 HintMedium, |
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286 HintFull |
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287 }; |
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288 |
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289 HintStyle default_hint_style; |
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290 |
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291 bool antialias; |
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292 bool transform; |
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293 SubpixelAntialiasingType subpixelType; |
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294 int lcdFilterType; |
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295 bool canUploadGlyphsToServer; |
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296 bool embeddedbitmap; |
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297 |
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298 private: |
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299 QFontEngineFT::Glyph *loadGlyphMetrics(QGlyphSet *set, uint glyph) const; |
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300 |
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301 GlyphFormat defaultFormat; |
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302 FT_Matrix matrix; |
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303 |
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304 QList<QGlyphSet> transformedGlyphSets; |
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305 mutable QGlyphSet defaultGlyphSet; |
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306 |
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307 QFontEngine::FaceId face_id; |
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308 |
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309 int xsize; |
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310 int ysize; |
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311 |
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312 mutable QFixed lbearing; |
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313 mutable QFixed rbearing; |
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314 QFixed line_thickness; |
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315 QFixed underline_position; |
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316 |
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317 FT_Size_Metrics metrics; |
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318 mutable bool kerning_pairs_loaded; |
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319 }; |
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320 |
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321 QT_END_NAMESPACE |
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322 |
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323 #endif // QT_NO_FREETYPE |
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324 |
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325 #endif // QFONTENGINE_FT_P_H |