1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtGui module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 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 Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 39 40 #ifndef QPAINTENGINE_ALPHA_P_H 41 #define QPAINTENGINE_ALPHA_P_H 42 43 // 44 // W A R N I N G 45 // ------------- 46 // 47 // This file is not part of the Qt API. It exists for the convenience 48 // of other Qt classes. This header file may change from version to 49 // version without notice, or even be removed. 50 // 51 // We mean it. 52 // 53 54 #include <QtPrintSupport/private/qtprintsupportglobal_p.h> 55 56 #ifndef QT_NO_PRINTER 57 #include "private/qpaintengine_p.h" 58 #include <QtPrintSupport/qtprintsupportglobal.h> 59 60 QT_BEGIN_NAMESPACE 61 62 class QAlphaPaintEnginePrivate; 63 64 class Q_PRINTSUPPORT_EXPORT QAlphaPaintEngine : public QPaintEngine 65 { 66 Q_DECLARE_PRIVATE(QAlphaPaintEngine) 67 public: 68 ~QAlphaPaintEngine(); 69 70 bool begin(QPaintDevice *pdev) override; 71 bool end() override; 72 73 void updateState(const QPaintEngineState &state) override; 74 75 void drawPath(const QPainterPath &path) override; 76 77 void drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode) override; 78 79 void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr) override; 80 void drawTextItem(const QPointF &p, const QTextItem &textItem) override; 81 void drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &s) override; 82 83 protected: 84 QAlphaPaintEngine(QAlphaPaintEnginePrivate &data, PaintEngineFeatures devcaps = { }); 85 QRegion alphaClipping() const; 86 bool continueCall() const; 87 void flushAndInit(bool init = true); 88 void cleanUp(); 89 }; 90 91 class QAlphaPaintEnginePrivate : public QPaintEnginePrivate 92 { 93 Q_DECLARE_PUBLIC(QAlphaPaintEngine) 94 public: 95 QAlphaPaintEnginePrivate(); 96 ~QAlphaPaintEnginePrivate(); 97 98 int m_pass; 99 QPicture *m_pic; 100 QPaintEngine *m_picengine; 101 QPainter *m_picpainter; 102 103 QPaintEngine::PaintEngineFeatures m_savedcaps; 104 QPaintDevice *m_pdev; 105 106 QRegion m_alphargn; 107 QRegion m_cliprgn; 108 mutable QRegion m_cachedDirtyRgn; 109 mutable int m_numberOfCachedRects; 110 QVector<QRect> m_dirtyRects; 111 112 bool m_hasalpha; 113 bool m_alphaPen; 114 bool m_alphaBrush; 115 bool m_alphaOpacity; 116 bool m_advancedPen; 117 bool m_advancedBrush; 118 bool m_complexTransform; 119 bool m_emulateProjectiveTransforms; 120 bool m_continueCall; 121 122 QTransform m_transform; 123 QPen m_pen; 124 125 void addAlphaRect(const QRectF &rect); addDirtyRect(const QRectF & rect)126 void addDirtyRect(const QRectF &rect) { m_dirtyRects.append(rect.toAlignedRect()); } 127 bool canSeeTroughBackground(bool somethingInRectHasAlpha, const QRectF &rect) const; 128 129 QRectF addPenWidth(const QPainterPath &path); 130 void drawAlphaImage(const QRectF &rect); 131 QRect toRect(const QRectF &rect) const; 132 bool fullyContained(const QRectF &rect) const; 133 134 void resetState(QPainter *p); 135 }; 136 137 QT_END_NAMESPACE 138 139 #endif // QT_NO_PRINTER 140 141 #endif // QPAINTENGINE_ALPHA_P_H 142