1 /****************************************************************************
2 **
3 ** Copyright (C) 2018 The Qt Company Ltd.
4 ** Contact: https://www.qt.io/licensing/
5 **
6 ** This file is part of the tools applications of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:GPL-EXCEPT$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and The Qt Company. For licensing terms
14 ** and conditions see https://www.qt.io/terms-conditions. For further
15 ** information use the contact form at https://www.qt.io/contact-us.
16 **
17 ** GNU General Public License Usage
18 ** Alternatively, this file may be used under the terms of the GNU
19 ** General Public License version 3 as published by the Free Software
20 ** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
21 ** included in the packaging of this file. Please review the following
22 ** information to ensure the GNU General Public License requirements will
23 ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
24 **
25 ** $QT_END_LICENSE$
26 **
27 ****************************************************************************/
28 
29 #ifndef DISTANCEFIELDMODELWORKER_H
30 #define DISTANCEFIELDMODELWORKER_H
31 
32 #include <QObject>
33 #include <QRawFont>
34 #include <QtGui/private/qtextengine_p.h>
35 
36 QT_BEGIN_NAMESPACE
37 
38 struct CmapSubtable0;
39 struct CmapSubtable4;
40 struct CmapSubtable6;
41 struct CmapSubtable10;
42 struct CmapSubtable12;
43 class DistanceFieldModelWorker : public QObject
44 {
45     Q_OBJECT
46 public:
47     explicit DistanceFieldModelWorker(QObject *parent = nullptr);
48 
49     Q_INVOKABLE void generateOneDistanceField();
50     Q_INVOKABLE void loadFont(const QString &fileName);
51 
52     void readCmapSubtable(const CmapSubtable0 *subtable, const void *end);
53     void readCmapSubtable(const CmapSubtable4 *subtable, const void *end);
54     void readCmapSubtable(const CmapSubtable6 *subtable, const void *end);
55     void readCmapSubtable(const CmapSubtable10 *subtable, const void *end);
56     void readCmapSubtable(const CmapSubtable12 *subtable, const void *end);
57 
58 signals:
59     void fontLoaded(quint16 glyphCount, bool doubleResolution, qreal pixelSize);
60     void fontGenerated();
61     void distanceFieldGenerated(const QImage &distanceField,
62                                 const QPainterPath &path,
63                                 glyph_t glyphId,
64                                 quint32 cmapAssignment);
65     void error(const QString &errorString);
66 
67 private:
68     void readGlyphCount();
69     void readCmap();
70 
71     QRawFont m_font;
72     quint16 m_glyphCount;
73     quint16 m_nextGlyphId;
74     bool m_doubleGlyphResolution;
75     QHash<glyph_t, quint32> m_cmapping;
76 };
77 
78 QT_END_NAMESPACE
79 
80 #endif // DISTANCEFIELDMODELWORKER_H
81