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These rights are described in The Qt Company LGPL Exception 28 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29 ** 30 ** GNU General Public License Usage 31 ** Alternatively, this file may be used under the terms of the GNU 32 ** General Public License version 3.0 as published by the Free Software 33 ** Foundation and appearing in the file LICENSE.GPL included in the 34 ** packaging of this file. Please review the following information to 35 ** ensure the GNU General Public License version 3.0 requirements will be 36 ** met: http://www.gnu.org/copyleft/gpl.html. 37 ** 38 ** $QT_END_LICENSE$ 39 ** 40 ****************************************************************************/ 41 42 #ifndef QFONTENGINE_QPA_P_H 43 #define QFONTENGINE_QPA_P_H 44 45 // 46 // W A R N I N G 47 // ------------- 48 // 49 // This file is not part of the Qt API. It exists purely as an 50 // implementation detail. This header file may change from version to 51 // version without notice, or even be removed. 52 // 53 // We mean it. 54 // 55 #include <QtCore/qconfig.h> 56 #include <QtCore/qglobal.h> 57 #include <QtCore/qendian.h> 58 #include <QtCore/QBuffer> 59 60 #include "qfontengine_p.h" 61 62 #include <QtCore/QFile> 63 64 QT_BEGIN_HEADER 65 66 QT_BEGIN_NAMESPACE 67 68 class QFontEngine; 69 class QFreetypeFace; 70 class QBuffer; 71 72 class Q_GUI_EXPORT QFontEngineQPA : public QFontEngine 73 { 74 public: 75 // if you add new tags please make sure to update the tables in 76 // qpfutil.cpp and tools/makeqpf/qpf2.cpp 77 enum HeaderTag { 78 Tag_FontName, // 0 string 79 Tag_FileName, // 1 string 80 Tag_FileIndex, // 2 quint32 81 Tag_FontRevision, // 3 quint32 82 Tag_FreeText, // 4 string 83 Tag_Ascent, // 5 QFixed 84 Tag_Descent, // 6 QFixed 85 Tag_Leading, // 7 QFixed 86 Tag_XHeight, // 8 QFixed 87 Tag_AverageCharWidth, // 9 QFixed 88 Tag_MaxCharWidth, // 10 QFixed 89 Tag_LineThickness, // 11 QFixed 90 Tag_MinLeftBearing, // 12 QFixed 91 Tag_MinRightBearing, // 13 QFixed 92 Tag_UnderlinePosition, // 14 QFixed 93 Tag_GlyphFormat, // 15 quint8 94 Tag_PixelSize, // 16 quint8 95 Tag_Weight, // 17 quint8 96 Tag_Style, // 18 quint8 97 Tag_EndOfHeader, // 19 string 98 Tag_WritingSystems, // 20 bitfield 99 100 NumTags 101 }; 102 103 enum TagType { 104 StringType, 105 FixedType, 106 UInt8Type, 107 UInt32Type, 108 BitFieldType 109 }; 110 111 struct Tag 112 { 113 quint16 tag; 114 quint16 size; 115 }; 116 117 enum GlyphFormat { 118 BitmapGlyphs = 1, 119 AlphamapGlyphs = 8 120 }; 121 122 enum { 123 CurrentMajorVersion = 2, 124 CurrentMinorVersion = 0 125 }; 126 127 // The CMap is identical to the TrueType CMap table format 128 // The GMap table is a normal array with the total number of 129 // covered glyphs in the TrueType font 130 enum BlockTag { 131 CMapBlock, 132 GMapBlock, 133 GlyphBlock 134 }; 135 136 struct Q_PACKED Header 137 { 138 char magic[4]; // 'QPF2' 139 quint32 lock; // values: 0 = unlocked, 0xffffffff = read-only, otherwise qws client id of locking process 140 quint8 majorVersion; 141 quint8 minorVersion; 142 quint16 dataSize; 143 }; 144 145 struct Q_PACKED Block 146 { 147 quint16 tag; 148 quint16 pad; 149 quint32 dataSize; 150 }; 151 152 struct Q_PACKED Glyph 153 { 154 quint8 width; 155 quint8 height; 156 quint8 bytesPerLine; 157 qint8 x; 158 qint8 y; 159 qint8 advance; 160 }; 161 162 QFontEngineQPA(const QFontDef &def, const QByteArray &data); 163 ~QFontEngineQPA(); 164 faceId()165 FaceId faceId() const { return face_id; } 166 bool getSfntTableData(uint tag, uchar *buffer, uint *length) const; 167 168 bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const; 169 void recalcAdvances(QGlyphLayout *, QTextEngine::ShaperFlags) const; 170 171 void addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags); 172 QImage alphaMapForGlyph(glyph_t t); 173 174 glyph_metrics_t boundingBox(const QGlyphLayout &glyphs); 175 glyph_metrics_t boundingBox(glyph_t glyph); 176 177 QFixed ascent() const; 178 QFixed descent() const; 179 QFixed leading() const; 180 qreal maxCharWidth() const; 181 qreal minLeftBearing() const; 182 qreal minRightBearing() const; 183 QFixed underlinePosition() const; 184 QFixed lineThickness() const; 185 186 Type type() const; 187 188 bool canRender(const QChar *string, int len); name()189 inline const char *name() const { return "QPF2"; } 190 glyphCount()191 virtual int glyphCount() const { return glyphMapEntries; } 192 193 bool isValid() const; 194 195 const Glyph *findGlyph(glyph_t g) const; 196 197 static bool verifyHeader(const uchar *data, int size); 198 static QVariant extractHeaderField(const uchar *data, HeaderTag tag); 199 200 private: 201 202 const uchar *fontData; 203 int dataSize; 204 const uchar *externalCMap; 205 quint32 cmapOffset; 206 int cmapSize; 207 quint32 glyphMapOffset; 208 quint32 glyphMapEntries; 209 quint32 glyphDataOffset; 210 quint32 glyphDataSize; 211 QString internalFileName; 212 QString encodedFileName; 213 bool readOnly; 214 215 FaceId face_id; 216 QByteArray freetypeCMapTable; 217 mutable bool kerning_pairs_loaded; 218 }; 219 220 struct QPAGenerator 221 { QPAGeneratorQPAGenerator222 QPAGenerator(QBuffer *device, QFontEngine *engine) 223 : dev(device), fe(engine) {} 224 225 void generate(); 226 void writeHeader(); 227 void writeGMap(); 228 void writeBlock(QFontEngineQPA::BlockTag tag, const QByteArray &data); 229 230 void writeTaggedString(QFontEngineQPA::HeaderTag tag, const QByteArray &string); 231 void writeTaggedUInt32(QFontEngineQPA::HeaderTag tag, quint32 value); 232 void writeTaggedUInt8(QFontEngineQPA::HeaderTag tag, quint8 value); 233 void writeTaggedQFixed(QFontEngineQPA::HeaderTag tag, QFixed value); 234 writeUInt16QPAGenerator235 void writeUInt16(quint16 value) { value = qToBigEndian(value); dev->write((const char *)&value, sizeof(value)); } writeUInt32QPAGenerator236 void writeUInt32(quint32 value) { value = qToBigEndian(value); dev->write((const char *)&value, sizeof(value)); } writeUInt8QPAGenerator237 void writeUInt8(quint8 value) { dev->write((const char *)&value, sizeof(value)); } writeInt8QPAGenerator238 void writeInt8(qint8 value) { dev->write((const char *)&value, sizeof(value)); } 239 align4QPAGenerator240 void align4() { while (dev->pos() & 3) { dev->putChar('\0'); } } 241 242 QBuffer *dev; 243 QFontEngine *fe; 244 }; 245 246 class QFontEngineMultiQPA : public QFontEngineMulti 247 { 248 public: 249 QFontEngineMultiQPA(QFontEngine *fe, int script, const QStringList &fallbacks); 250 251 void loadEngine(int at); 252 253 private: 254 QStringList fallbackFamilies; 255 int script; 256 }; 257 258 QT_END_NAMESPACE 259 260 QT_END_HEADER 261 262 #endif // QFONTENGINE_QPA_P_H 263