qpaintengine_alpha.cpp

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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**-
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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-
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35**-
36** $QT_END_LICENSE$-
37**-
38****************************************************************************/-
39-
40#include <qglobal.h>-
41-
42#ifndef QT_NO_PRINTER-
43#include <qdebug.h>-
44#include "private/qpaintengine_alpha_p.h"-
45-
46#include "private/qpainter_p.h"-
47#include "private/qpicture_p.h"-
48#include "private/qfont_p.h"-
49#include "QtGui/qpicture.h"-
50-
51QT_BEGIN_NAMESPACE-
52-
53QAlphaPaintEngine::QAlphaPaintEngine(QAlphaPaintEnginePrivate &data, PaintEngineFeatures devcaps)-
54 : QPaintEngine(data, devcaps)-
55{-
56-
57}-
58-
59QAlphaPaintEngine::~QAlphaPaintEngine()-
60{-
61-
62}-
63-
64bool QAlphaPaintEngine::begin(QPaintDevice *pdev)-
65{-
66 Q_D(QAlphaPaintEngine);-
67-
68 d->m_continueCall = true;-
69 if (d->m_pass != 0) {-
70 return true;-
71 }-
72-
73 d->m_savedcaps = gccaps;-
74 d->m_pdev = pdev;-
75-
76 d->m_alphaPen = false;-
77 d->m_alphaBrush = false;-
78 d->m_alphaOpacity = false;-
79 d->m_hasalpha = false;-
80 d->m_advancedPen = false;-
81 d->m_advancedBrush = false;-
82 d->m_complexTransform = false;-
83 d->m_emulateProjectiveTransforms = false;-
84-
85 // clear alpha region-
86 d->m_alphargn = QRegion();-
87 d->m_cliprgn = QRegion();-
88 d->m_pen = QPen();-
89 d->m_transform = QTransform();-
90-
91 flushAndInit();-
92-
93 return true;-
94}-
95-
96bool QAlphaPaintEngine::end()-
97{-
98 Q_D(QAlphaPaintEngine);-
99-
100 d->m_continueCall = true;-
101 if (d->m_pass != 0) {-
102 return true;-
103 }-
104-
105 flushAndInit(false);-
106 return true;-
107}-
108-
109void QAlphaPaintEngine::updateState(const QPaintEngineState &state)-
110{-
111 Q_D(QAlphaPaintEngine);-
112-
113 DirtyFlags flags = state.state();-
114 if (flags & QPaintEngine::DirtyTransform) {-
115 d->m_transform = state.transform();-
116 d->m_complexTransform = (d->m_transform.type() > QTransform::TxScale);-
117 d->m_emulateProjectiveTransforms = !(d->m_savedcaps & QPaintEngine::PerspectiveTransform)-
118 && !(d->m_savedcaps & QPaintEngine::AlphaBlend)-
119 && (d->m_transform.type() >= QTransform::TxProject);-
120 }-
121 if (flags & QPaintEngine::DirtyPen) {-
122 d->m_pen = state.pen();-
123 if (d->m_pen.style() == Qt::NoPen) {-
124 d->m_advancedPen = false;-
125 d->m_alphaPen = false;-
126 } else {-
127 d->m_advancedPen = (d->m_pen.brush().style() != Qt::SolidPattern);-
128 d->m_alphaPen = !d->m_pen.brush().isOpaque();-
129 }-
130 }-
131-
132 if (d->m_pass != 0) {-
133 d->m_continueCall = true;-
134 return;-
135 }-
136 d->m_continueCall = false;-
137-
138 if (flags & QPaintEngine::DirtyOpacity) {-
139 d->m_alphaOpacity = (state.opacity() != 1.0f);-
140 }-
141-
142 if (flags & QPaintEngine::DirtyBrush) {-
143 if (state.brush().style() == Qt::NoBrush) {-
144 d->m_advancedBrush = false;-
145 d->m_alphaBrush = false;-
146 } else {-
147 d->m_advancedBrush = (state.brush().style() != Qt::SolidPattern);-
148 d->m_alphaBrush = !state.brush().isOpaque();-
149 }-
150 }-
151-
152-
153 d->m_hasalpha = d->m_alphaOpacity || d->m_alphaBrush || d->m_alphaPen;-
154-
155 if (d->m_picengine) {-
156 const QPainter *p = painter();-
157 d->m_picpainter->setPen(p->pen());-
158 d->m_picpainter->setBrush(p->brush());-
159 d->m_picpainter->setBrushOrigin(p->brushOrigin());-
160 d->m_picpainter->setFont(p->font());-
161 d->m_picpainter->setOpacity(p->opacity());-
162 d->m_picpainter->setTransform(p->combinedTransform());-
163 d->m_picengine->updateState(state);-
164 }-
165}-
166-
167void QAlphaPaintEngine::drawPath(const QPainterPath &path)-
168{-
169 Q_D(QAlphaPaintEngine);-
170-
171 QRectF tr = d->addPenWidth(path);-
172-
173 if (d->m_pass == 0) {-
174 d->m_continueCall = false;-
175 if (d->canSeeTroughBackground(d->m_hasalpha, tr) || d->m_advancedPen || d->m_advancedBrush-
176 || d->m_emulateProjectiveTransforms)-
177 {-
178 d->addAlphaRect(tr);-
179 }-
180-
181 d->addDirtyRect(tr);-
182-
183 if (d->m_picengine)-
184 d->m_picengine->drawPath(path);-
185 } else {-
186 d->m_continueCall = !d->fullyContained(tr);-
187 }-
188}-
189-
190void QAlphaPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)-
191{-
192 Q_D(QAlphaPaintEngine);-
193-
194 QPolygonF poly;-
195 poly.reserve(pointCount);-
196 for (int i = 0; i < pointCount; ++i)-
197 poly.append(points[i]);-
198-
199 QPainterPath path;-
200 path.addPolygon(poly);-
201 QRectF tr = d->addPenWidth(path);-
202-
203 if (d->m_pass == 0) {-
204 d->m_continueCall = false;-
205 if (d->canSeeTroughBackground(d->m_hasalpha, tr) || d->m_advancedPen || d->m_advancedBrush-
206 || d->m_emulateProjectiveTransforms)-
207 {-
208 d->addAlphaRect(tr);-
209 }-
210-
211 d->addDirtyRect(tr);-
212-
213 if (d->m_picengine)-
214 d->m_picengine->drawPolygon(points, pointCount, mode);-
215 } else {-
216 d->m_continueCall = !d->fullyContained(tr);-
217 }-
218}-
219-
220void QAlphaPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr)-
221{-
222 Q_D(QAlphaPaintEngine);-
223-
224 QRectF tr = d->m_transform.mapRect(r);-
225 if (d->m_pass == 0) {-
226 d->m_continueCall = false;-
227 if (d->canSeeTroughBackground(pm.hasAlpha() || d->m_alphaOpacity, tr) || d->m_complexTransform || pm.isQBitmap()) {-
228 d->addAlphaRect(tr);-
229 }-
230-
231 d->addDirtyRect(tr);-
232-
233 if (d->m_picengine)-
234 d->m_picengine->drawPixmap(r, pm, sr);-
235-
236 } else {-
237 d->m_continueCall = !d->fullyContained(tr);-
238 }-
239}-
240-
241void QAlphaPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)-
242{-
243 Q_D(QAlphaPaintEngine);-
244-
245 QRectF tr(p.x(), p.y() - textItem.ascent(), textItem.width() + 5, textItem.ascent() + textItem.descent() + 5);-
246 tr = d->m_transform.mapRect(tr);-
247-
248 if (d->m_pass == 0) {-
249 d->m_continueCall = false;-
250 if (d->canSeeTroughBackground(d->m_alphaPen || d->m_alphaOpacity, tr) || d->m_advancedPen) {-
251 d->addAlphaRect(tr);-
252 }-
253-
254 d->addDirtyRect(tr);-
255-
256 if (d->m_picengine) {-
257 d->m_picengine->drawTextItem(p, textItem);-
258 }-
259 } else {-
260 d->m_continueCall = !d->fullyContained(tr);-
261 }-
262}-
263-
264void QAlphaPaintEngine::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &s)-
265{-
266 Q_D(QAlphaPaintEngine);-
267-
268 QRectF brect = d->m_transform.mapRect(r);-
269-
270 if (d->m_pass == 0) {-
271 d->m_continueCall = false;-
272 if (d->canSeeTroughBackground(pixmap.hasAlpha() || d->m_alphaOpacity, brect) || d->m_complexTransform || pixmap.isQBitmap()) {-
273 d->addAlphaRect(brect);-
274 }-
275-
276 d->addDirtyRect(brect);-
277-
278 if (d->m_picengine)-
279 d->m_picengine->drawTiledPixmap(r, pixmap, s);-
280 } else {-
281 d->m_continueCall = !d->fullyContained(brect);-
282 }-
283}-
284-
285QRegion QAlphaPaintEngine::alphaClipping() const-
286{-
287 Q_D(const QAlphaPaintEngine);-
288 return d->m_cliprgn;-
289}-
290-
291bool QAlphaPaintEngine::continueCall() const-
292{-
293 Q_D(const QAlphaPaintEngine);-
294 return d->m_continueCall;-
295}-
296-
297void QAlphaPaintEngine::flushAndInit(bool init)-
298{-
299 Q_D(QAlphaPaintEngine);-
300 Q_ASSERT(d->m_pass == 0);-
301-
302 if (d->m_pic) {
d->m_picDescription
TRUEnever evaluated
FALSEnever evaluated
0
303 d->m_picpainter->end();-
304-
305 // set clip region-
306 d->m_alphargn = d->m_alphargn.intersected(QRect(0, 0, d->m_pdev->width(), d->m_pdev->height()));-
307-
308 // just use the bounding rect if it's a complex region..-
309 QVector<QRect> rects = d->m_alphargn.rects();-
310 if (rects.size() > 10) {
rects.size() > 10Description
TRUEnever evaluated
FALSEnever evaluated
0
311 QRect br = d->m_alphargn.boundingRect();-
312 d->m_alphargn = QRegion(br);-
313 rects.clear();-
314 rects.append(br);-
315 }
never executed: end of block
0
316-
317 d->m_cliprgn = d->m_alphargn;-
318-
319 // now replay the QPicture-
320 ++d->m_pass; // we are now doing pass #2-
321-
322 // reset states-
323 gccaps = d->m_savedcaps;-
324-
325 painter()->save();-
326 d->resetState(painter());-
327-
328 // make sure the output from QPicture is unscaled-
329 QTransform mtx;-
330 mtx.scale(1.0f / (qreal(d->m_pdev->logicalDpiX()) / qreal(qt_defaultDpiX())),-
331 1.0f / (qreal(d->m_pdev->logicalDpiY()) / qreal(qt_defaultDpiY())));-
332 painter()->setTransform(mtx);-
333 painter()->drawPicture(0, 0, *d->m_pic);-
334-
335 d->m_cliprgn = QRegion();-
336 d->resetState(painter());-
337-
338 // fill in the alpha images-
339 for (int i=0; i<const auto &rect : qAsConst(rects.size(); ++i)))-
340 d->drawAlphaImage(rects.at(i));rect);
never executed: d->drawAlphaImage(rect);
0
341-
342 d->m_alphargn = QRegion();-
343-
344 painter()->restore();-
345-
346 --d->m_pass; // pass #2 finished-
347-
348 cleanUp();-
349 }
never executed: end of block
0
350-
351 if (init) {
initDescription
TRUEnever evaluated
FALSEnever evaluated
0
352 gccaps = PaintEngineFeatures(AllFeatures & ~QPaintEngine::ObjectBoundingModeGradients);-
353-
354 d->m_pic = new QPicture();-
355 d->m_pic->d_ptr->in_memory_only = true;-
356 d->m_picpainter = new QPainter(d->m_pic);-
357 d->m_picengine = d->m_picpainter->paintEngine();-
358-
359 // When newPage() is called and the m_picpainter is recreated-
360 // we have to copy the current state of the original printer-
361 // painter back to the m_picpainter-
362 d->m_picpainter->setPen(painter()->pen());-
363 d->m_picpainter->setBrush(painter()->brush());-
364 d->m_picpainter->setBrushOrigin(painter()->brushOrigin());-
365 d->m_picpainter->setFont(painter()->font());-
366 d->m_picpainter->setOpacity(painter()->opacity());-
367 d->m_picpainter->setTransform(painter()->combinedTransform());-
368 d->m_picengine->syncState();-
369 QPainterState &state = *d->m_picpainter->d_func()->state;-
370 QPainter *oldPainter = state.painter;-
371 state = *painter()->d_func()->state;-
372 state.painter = oldPainter;-
373 }
never executed: end of block
0
374}
never executed: end of block
0
375-
376void QAlphaPaintEngine::cleanUp()-
377{-
378 Q_D(QAlphaPaintEngine);-
379-
380 delete d->m_picpainter;-
381 delete d->m_pic;-
382-
383 d->m_picpainter = 0;-
384 d->m_pic = 0;-
385 d->m_picengine = 0;-
386}-
387-
388QAlphaPaintEnginePrivate::QAlphaPaintEnginePrivate()-
389 : m_pass(0),-
390 m_pic(0),-
391 m_picengine(0),-
392 m_picpainter(0),-
393 m_numberOfCachedRects(0),-
394 m_hasalpha(false),-
395 m_alphaPen(false),-
396 m_alphaBrush(false),-
397 m_alphaOpacity(false),-
398 m_advancedPen(false),-
399 m_advancedBrush(false),-
400 m_complexTransform(false)-
401{-
402-
403}-
404-
405QAlphaPaintEnginePrivate::~QAlphaPaintEnginePrivate()-
406{-
407 delete m_picpainter;-
408 delete m_pic;-
409}-
410-
411QRectF QAlphaPaintEnginePrivate::addPenWidth(const QPainterPath &path)-
412{-
413 Q_Q(QAlphaPaintEngine);-
414-
415 QPainterPath tmp = path;-
416-
417 if (m_pen.style() == Qt::NoPen)-
418 return (path.controlPointRect() * m_transform).boundingRect();-
419 bool cosmetic = qt_pen_is_cosmetic(m_pen, q->state->renderHints());-
420 if (cosmetic)-
421 tmp = path * m_transform;-
422-
423 QPainterPathStroker stroker;-
424 if (m_pen.widthF() == 0.0f)-
425 stroker.setWidth(1.0);-
426 else-
427 stroker.setWidth(m_pen.widthF());-
428 stroker.setJoinStyle(m_pen.joinStyle());-
429 stroker.setCapStyle(m_pen.capStyle());-
430 tmp = stroker.createStroke(tmp);-
431 if (cosmetic)-
432 return tmp.controlPointRect();-
433-
434 return (tmp.controlPointRect() * m_transform).boundingRect();-
435}-
436-
437void QAlphaPaintEnginePrivate::addAlphaRect(const QRectF &rect)-
438{-
439 m_alphargn |= rect.toAlignedRect();-
440}-
441-
442bool QAlphaPaintEnginePrivate::canSeeTroughBackground(bool somethingInRectHasAlpha, const QRectF &rect) const-
443{-
444 if (somethingInRectHasAlpha) {-
445 if (m_dirtyRects.count() != m_numberOfCachedRects) {-
446 m_cachedDirtyRgn.setRects(m_dirtyRects.constData(), m_dirtyRects.count());-
447 m_numberOfCachedRects = m_dirtyRects.count();-
448 }-
449 return m_cachedDirtyRgn.intersects(rect.toAlignedRect());-
450 }-
451 return false;-
452}-
453-
454void QAlphaPaintEnginePrivate::drawAlphaImage(const QRectF &rect)-
455{-
456 Q_Q(QAlphaPaintEngine);-
457-
458 qreal dpiX = qMax(m_pdev->logicalDpiX(), 300);-
459 qreal dpiY = qMax(m_pdev->logicalDpiY(), 300);-
460 qreal xscale = (dpiX / m_pdev->logicalDpiX());-
461 qreal yscale = (dpiY / m_pdev->logicalDpiY());-
462-
463 QTransform picscale;-
464 picscale.scale(xscale, yscale);-
465-
466 const int tileSize = 2048;-
467 QSize size((int(rect.width() * xscale)), int(rect.height() * yscale));-
468 int divw = (size.width() / tileSize);-
469 int divh = (size.height() / tileSize);-
470 divw += 1;-
471 divh += 1;-
472-
473 int incx = int(rect.width() / divw);-
474 int incy = int(rect.height() / divh);-
475-
476 for (int y=0; y<divh; ++y) {-
477 int ypos = int((incy * y) + rect.y());-
478 int height = int((y == (divh - 1)) ? (rect.height() - (incy * y)) : incy) + 1;-
479-
480 for (int x=0; x<divw; ++x) {-
481 int xpos = int((incx * x) + rect.x());-
482 int width = int((x == (divw - 1)) ? (rect.width() - (incx * x)) : incx) + 1;-
483-
484 QSize imgsize((int)(width * xscale), (int)(height * yscale));-
485 QImage img(imgsize, QImage::Format_RGB32);-
486 img.fill(0xffffffff);-
487-
488 QPainter imgpainter(&img);-
489 imgpainter.setTransform(picscale);-
490 QPointF picpos(qreal(-xpos), qreal(-ypos));-
491 imgpainter.drawPicture(picpos, *m_pic);-
492 imgpainter.end();-
493-
494 q->painter()->setTransform(QTransform());-
495 QRect r(xpos, ypos, width, height);-
496 q->painter()->drawImage(r, img);-
497 }-
498 }-
499}-
500-
501bool QAlphaPaintEnginePrivate::fullyContained(const QRectF &rect) const-
502{-
503 QRegion r(rect.toAlignedRect());-
504 return (m_cliprgn.intersected(r) == r);-
505}-
506-
507void QAlphaPaintEnginePrivate::resetState(QPainter *p)-
508{-
509 p->setPen(QPen());-
510 p->setBrush(QBrush());-
511 p->setBrushOrigin(0,0);-
512 p->setBackground(QBrush());-
513 p->setFont(QFont());-
514 p->setTransform(QTransform());-
515 // The view transform is already recorded and included in the-
516 // picture we're about to replay. If we don't turn if off,-
517 // the view matrix will be applied twice.-
518 p->setViewTransformEnabled(false);-
519 p->setClipRegion(QRegion(), Qt::NoClip);-
520 p->setClipPath(QPainterPath(), Qt::NoClip);-
521 p->setClipping(false);-
522 p->setOpacity(1.0f);-
523}-
524-
525-
526QT_END_NAMESPACE-
527-
528#endif // QT_NO_PRINTER-
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