KSane

ksaneviewer.cpp
1/*
2 * SPDX-FileCopyrightText: 2008 Kare Sars <kare dot sars at iki dot fi>
3 * SPDX-FileCopyrightText: 2014 Gregor Mitsch : port to KDE5 frameworks
4 *
5 * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
6 */
7
8#include "ksaneviewer.h"
9
10#include "selectionitem.h"
11#include "hiderectitem.h"
12
13#include <QGraphicsPixmapItem>
14#include <QGraphicsScene>
15#include <QGraphicsRectItem>
16#include <QScrollBar>
17#include <QAction>
18#include <QList>
19#include <QVector>
20#include <QIcon>
21
22#include <KLocalizedString>
23
24#include <math.h>
25
26namespace KSaneIface
27{
28
29struct KSaneViewer::Private {
30 QGraphicsScene *scene;
31 SelectionItem *selection;
32 QImage *img;
33
34 QList<SelectionItem *> selectionList;
35 SelectionItem::Intersects change;
36
37 QPointF lastSPoint;
38 int m_left_last_x;
39 int m_left_last_y;
40
41 QAction *zoomInAction;
42 QAction *zoomOutAction;
43 QAction *zoomSelAction;
44 QAction *zoom2FitAction;
45 QAction *clrSelAction;
46
47 HideRectItem *hideLeft;
48 HideRectItem *hideRight;
49 HideRectItem *hideTop;
50 HideRectItem *hideBottom;
51 HideRectItem *hideArea;
52
53 bool multiSelectionEnabled = true;
54
55 int wheelDelta = 0;
56
57 int currentImageWidth;
58 int currentImageHeight;
59
60 QGraphicsPolygonItem * border;
61};
62
63KSaneViewer::KSaneViewer(QImage *img, QWidget *parent) : QGraphicsView(parent), d(new Private)
64{
65 d->img = img;
66
67 setMouseTracking(true);
68
69 // Init the scene
70 d->scene = new QGraphicsScene(this);
71 const auto dpr = img->devicePixelRatio();
72
73 d->currentImageWidth = img->width();
74 d->currentImageHeight = img->height();
75
76 d->scene->setSceneRect(0, 0, d->currentImageWidth / dpr, d->currentImageHeight / dpr);
77 setScene(d->scene);
78
79 d->selection = new SelectionItem(QRectF());
80 d->selection->setZValue(10);
81 d->selection->setSaved(false);
82 d->selection->setMaxRight(d->currentImageWidth);
83 d->selection->setMaxBottom(d->currentImageHeight);
84 d->selection->setRect(d->scene->sceneRect());
85 d->selection->setVisible(false);
86
87 d->hideTop = new HideRectItem;
88 d->hideBottom = new HideRectItem;
89 d->hideRight = new HideRectItem;
90 d->hideLeft = new HideRectItem;
91 d->hideArea = new HideRectItem;
92 d->hideArea->setOpacity(0.6);
93
94 d->scene->addItem(d->selection);
95 d->scene->addItem(d->hideLeft);
96 d->scene->addItem(d->hideRight);
97 d->scene->addItem(d->hideTop);
98 d->scene->addItem(d->hideBottom);
99 d->scene->addItem(d->hideArea);
100
101 QPolygonF polygon(QRectF(QPointF(0,0),QSizeF(d->currentImageWidth, d->currentImageHeight)));
102 QPen pen(Qt::gray, 0, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);
103 d->border = d->scene->addPolygon(polygon, pen);
104
105 d->change = SelectionItem::None;
106 d->selectionList.clear();
107
108 // create context menu
109 d->zoomInAction = new QAction(QIcon::fromTheme(QLatin1String("zoom-in")), i18n("Zoom In"), this);
110 connect(d->zoomInAction, &QAction::triggered, this, &KSaneViewer::zoomIn);
111
112 d->zoomOutAction = new QAction(QIcon::fromTheme(QLatin1String("zoom-out")), i18n("Zoom Out"), this);
113 connect(d->zoomOutAction, &QAction::triggered, this, &KSaneViewer::zoomOut);
114
115 d->zoomSelAction = new QAction(QIcon::fromTheme(QLatin1String("zoom-fit-best")), i18n("Zoom to Selection"), this);
116 connect(d->zoomSelAction, &QAction::triggered, this, &KSaneViewer::zoomSel);
117
118 d->zoom2FitAction = new QAction(QIcon::fromTheme(QLatin1String("document-preview")), i18n("Zoom to Fit"), this);
119 connect(d->zoom2FitAction, &QAction::triggered, this, &KSaneViewer::zoom2Fit);
120
121 d->clrSelAction = new QAction(QIcon::fromTheme(QLatin1String("edit-clear")), i18n("Clear Selections"), this);
122 connect(d->clrSelAction, &QAction::triggered, this, &KSaneViewer::clearSelections);
123
124 addAction(d->zoomInAction);
125 addAction(d->zoomOutAction);
126 addAction(d->zoomSelAction);
127 addAction(d->zoom2FitAction);
128 addAction(d->clrSelAction);
129 setContextMenuPolicy(Qt::ActionsContextMenu);
130
131 setFrameShape(QFrame::NoFrame);
132}
133
134// ------------------------------------------------------------------------
135void KSaneViewer::drawBackground(QPainter *painter, const QRectF &rect)
136{
137 painter->fillRect(rect, QWidget::palette().color(QPalette::Window));
138 QRectF r = rect & sceneRect();
139 const qreal dpr = d->img->devicePixelRatio();
140 QRectF srcRect = QRectF(r.topLeft() * dpr, r.size() * dpr);
141 painter->drawImage(r, *d->img, srcRect);
142 d->border->setPolygon(QPolygonF(QRectF(QPointF(0,0),QSizeF(d->currentImageWidth, d->currentImageHeight))));
143}
144
145// ------------------------------------------------------------------------
146KSaneViewer::~KSaneViewer()
147{
148 // first remove any old saved selections
149 clearSavedSelections();
150
151 delete d;
152}
153
154// ------------------------------------------------------------------------
155int KSaneViewer::currentImageHeight() const
156{
157 return d->currentImageHeight;
158}
159
160// ------------------------------------------------------------------------
161int KSaneViewer::currentImageWidth() const
162{
163 return d->currentImageWidth;
164}
165
166// ------------------------------------------------------------------------
167void KSaneViewer::setQImage(QImage *img)
168{
169 if (img == nullptr) {
170 return;
171 }
172
173 // remove selections
174 clearSelections();
175
176 // clear zoom
177 resetTransform();
178
179 const auto dpr = img->devicePixelRatio();
180
181 d->currentImageWidth = img->width();
182 d->currentImageHeight = img->height();
183
184 d->scene->setSceneRect(0, 0, d->currentImageWidth / dpr, d->currentImageHeight / dpr);
185 d->selection->setMaxRight(d->currentImageWidth);
186 d->selection->setMaxBottom(d->currentImageHeight);
187
188 d->selection->setDevicePixelRatio(dpr);
189 d->hideTop->setDevicePixelRatio(dpr);
190 d->hideBottom->setDevicePixelRatio(dpr);
191 d->hideRight->setDevicePixelRatio(dpr);
192 d->hideLeft->setDevicePixelRatio(dpr);
193 d->hideArea->setDevicePixelRatio(dpr);
194
195 d->img = img;
196}
197
198// ------------------------------------------------------------------------
199void KSaneViewer::updateImage()
200{
201 setCacheMode(QGraphicsView::CacheNone);
202 repaint();
203 setCacheMode(QGraphicsView::CacheBackground);
204}
205
206// ------------------------------------------------------------------------
207void KSaneViewer::zoomIn()
208{
209 scale(1.3, 1.3);
210 d->selection->saveZoom(transform().m11());
211 for (int i = 0; i < d->selectionList.size(); ++i) {
212 d->selectionList[i]->saveZoom(transform().m11());
213 }
214}
215
216// ------------------------------------------------------------------------
217void KSaneViewer::zoomOut()
218{
219 scale(1.0 / 1.3, 1.0 / 1.3);
220 d->selection->saveZoom(transform().m11());
221 for (int i = 0; i < d->selectionList.size(); ++i) {
222 d->selectionList[i]->saveZoom(transform().m11());
223 }
224}
225
226// ------------------------------------------------------------------------
227void KSaneViewer::zoomSel()
228{
229 if (d->selection->isVisible()) {
230 fitInView(d->selection->boundingRect() , Qt::KeepAspectRatio);
231 d->selection->saveZoom(transform().m11());
232 for (int i = 0; i < d->selectionList.size(); ++i) {
233 d->selectionList[i]->saveZoom(transform().m11());
234 }
235 } else {
236 zoom2Fit();
237 }
238}
239
240// ------------------------------------------------------------------------
241void KSaneViewer::zoom2Fit()
242{
243 fitInView(d->img->rect(), Qt::KeepAspectRatio);
244 d->selection->saveZoom(transform().m11());
245 for (int i = 0; i < d->selectionList.size(); ++i) {
246 d->selectionList[i]->saveZoom(transform().m11());
247 }
248}
249
250// ------------------------------------------------------------------------
251void KSaneViewer::setTLX(float ratio)
252{
253 if (!d->selection->isVisible()) {
254 return; // only correct the selection if it is visible
255 }
256 QRectF rect = d->selection->rect();
257 rect.setLeft(ratio * d->img->width());
258 d->selection->setRect(rect);
259 updateSelVisibility();
260}
261
262// ------------------------------------------------------------------------
263void KSaneViewer::setTLY(float ratio)
264{
265 if (!d->selection->isVisible()) {
266 return; // only correct the selection if it is visible
267 }
268 QRectF rect = d->selection->rect();
269 rect.setTop(ratio * d->img->height());
270 d->selection->setRect(rect);
271 updateSelVisibility();
272}
273
274// ------------------------------------------------------------------------
275void KSaneViewer::setBRX(float ratio)
276{
277 if (!d->selection->isVisible()) {
278 return; // only correct the selection if it is visible
279 }
280 QRectF rect = d->selection->rect();
281 rect.setRight(ratio * d->img->width());
282 d->selection->setRect(rect);
283 updateSelVisibility();
284}
285
286// ------------------------------------------------------------------------
287void KSaneViewer::setBRY(float ratio)
288{
289 if (!d->selection->isVisible()) {
290 return; // only correct the selection if it is visible
291 }
292 QRectF rect = d->selection->rect();
293 rect.setBottom(ratio * d->img->height());
294 d->selection->setRect(rect);
295 updateSelVisibility();
296}
297
298// ------------------------------------------------------------------------
299void KSaneViewer::setSelection(float tl_x, float tl_y, float br_x, float br_y)
300{
301 QRectF rect;
302 rect.setCoords(tl_x * d->img->width(),
303 tl_y * d->img->height(),
304 br_x * d->img->width(),
305 br_y * d->img->height());
306
307 d->selection->setRect(rect);
308 updateSelVisibility();
309}
310
311// ------------------------------------------------------------------------
312void KSaneViewer::setHighlightArea(float tl_x, float tl_y, float br_x, float br_y)
313{
314 QRectF rect;
315
316 // Left reason for rect: setCoords(x1,y1,x2,y2) != setRect(x1,x2, width, height)
317 rect.setCoords(0, 0, tl_x * d->img->width(), d->img->height());
318 d->hideLeft->setRect(rect);
319
320 // Right
321 rect.setCoords(br_x * d->img->width(),
322 0,
323 d->img->width(),
324 d->img->height());
325 d->hideRight->setRect(rect);
326
327 // Top
328 rect.setCoords(tl_x * d->img->width(),
329 0,
330 br_x * d->img->width(),
331 tl_y * d->img->height());
332 d->hideTop->setRect(rect);
333
334 // Bottom
335 rect.setCoords(tl_x * d->img->width(),
336 br_y * d->img->height(),
337 br_x * d->img->width(),
338 d->img->height());
339 d->hideBottom->setRect(rect);
340
341 // hide area
342 rect.setCoords(tl_x * d->img->width(), tl_y * d->img->height(),
343 br_x * d->img->width(), br_y * d->img->height());
344
345 d->hideArea->setRect(rect);
346
347 d->hideLeft->show();
348 d->hideRight->show();
349 d->hideTop->show();
350 d->hideBottom->show();
351 // the hide area is hidden until setHighlightShown is called.
352 d->hideArea->hide();
353}
354
355// ------------------------------------------------------------------------
356void KSaneViewer::setHighlightShown(int percentage, QColor hideColor)
357{
358 if (percentage >= 100) {
359 d->hideArea->hide();
360 return;
361 }
362
363 d->hideArea->setBrush(hideColor);
364
365 qreal diff = d->hideBottom->rect().top() - d->hideTop->rect().bottom();
366 diff -= (diff * percentage) / 100;
367
368 QRectF rect = d->hideArea->rect();
369 rect.setTop(d->hideBottom->rect().top() - diff);
370
371 d->hideArea->setRect(rect);
372
373 d->hideArea->show();
374}
375
376// ------------------------------------------------------------------------
377void KSaneViewer::updateHighlight()
378{
379 if (d->selection->isVisible()) {
380 QRectF rect;
381 // Left
382 rect.setCoords(0, 0, d->selection->rect().left(), d->img->height());
383 d->hideLeft->setRect(rect);
384
385 // Right
386 rect.setCoords(d->selection->rect().right(),
387 0,
388 d->img->width(),
389 d->img->height());
390 d->hideRight->setRect(rect);
391
392 // Top
393 rect.setCoords(d->selection->rect().left(),
394 0,
395 d->selection->rect().right(),
396 d->selection->rect().top());
397 d->hideTop->setRect(rect);
398
399 // Bottom
400 rect.setCoords(d->selection->rect().left(),
401 d->selection->rect().bottom(),
402 d->selection->rect().right(),
403 d->img->height());
404 d->hideBottom->setRect(rect);
405
406 d->hideLeft->show();
407 d->hideRight->show();
408 d->hideTop->show();
409 d->hideBottom->show();
410 d->hideArea->hide();
411 } else {
412 d->hideLeft->hide();
413 d->hideRight->hide();
414 d->hideTop->hide();
415 d->hideBottom->hide();
416 d->hideArea->hide();
417 }
418}
419
420// ------------------------------------------------------------------------
421void KSaneViewer::clearHighlight()
422{
423 d->hideLeft->hide();
424 d->hideRight->hide();
425 d->hideTop->hide();
426 d->hideBottom->hide();
427 d->hideArea->hide();
428}
429
430// ------------------------------------------------------------------------
431void KSaneViewer::updateSelVisibility()
432{
433 if ((d->selection->rect().width() > 0.001) &&
434 (d->selection->rect().height() > 0.001) &&
435 ((d->img->width() - d->selection->rect().width() > 0.1) ||
436 (d->img->height() - d->selection->rect().height() > 0.1))) {
437 d->selection->setVisible(true);
438 } else {
439 d->selection->setVisible(false);
440 }
441 updateHighlight();
442}
443
444// ---- Return the saved selection list size + 1 if the selection is visible -
445int KSaneViewer::selListSize()
446{
447 if (d->selection->isVisible()) {
448 return (d->selectionList.size() + 1);
449 } else {
450 return d->selectionList.size();
451 }
452}
453
454// ---- First return the "saved" selection sthen the active selection -----------
455bool KSaneViewer::selectionAt(int index, float &tl_x, float &tl_y, float &br_x, float &br_y)
456{
457 if ((index < 0) || (index > d->selectionList.size())) {
458 activeSelection(tl_x, tl_y, br_x, br_y);
459 return false;
460 }
461 if (index == d->selectionList.size()) {
462 return activeSelection(tl_x, tl_y, br_x, br_y);
463 }
464
465 tl_x = d->selectionList[index]->rect().left() / d->img->width();
466 tl_y = d->selectionList[index]->rect().top() / d->img->height();
467 br_x = d->selectionList[index]->rect().right() / d->img->width();
468 br_y = d->selectionList[index]->rect().bottom() / d->img->height();
469 return true;
470}
471
472// ------------------------------------------------------------------------
473bool KSaneViewer::activeSelection(float &tl_x, float &tl_y, float &br_x, float &br_y)
474{
475 if (!d->selection->isVisible()) {
476 tl_x = 0.0;
477 tl_y = 0.0;
478 br_x = 1.0;
479 br_y = 1.0;
480 return true;
481 }
482
483 tl_x = d->selection->rect().left() / d->img->width();
484 tl_y = d->selection->rect().top() / d->img->height();
485 br_x = d->selection->rect().right() / d->img->width();
486 br_y = d->selection->rect().bottom() / d->img->height();
487
488 if ((tl_x == br_x) || (tl_y == br_y)) {
489 tl_x = 0.0;
490 tl_y = 0.0;
491 br_x = 1.0;
492 br_y = 1.0;
493 return false; // just precaution
494 }
495 return true;
496}
497
498// ------------------------------------------------------------------------
499void KSaneViewer::clearActiveSelection()
500{
501 d->selection->setRect(QRectF(0, 0, 0, 0));
502 d->selection->intersects(QPointF(100, 100)); // don't show the add sign
503 d->selection->setVisible(false);
504}
505
506// ------------------------------------------------------------------------
507void KSaneViewer::clearSavedSelections()
508{
509 // first remove any old saved selections
510 SelectionItem *tmp;
511 while (!d->selectionList.isEmpty()) {
512 tmp = d->selectionList.takeFirst();
513 d->scene->removeItem(tmp);
514 delete tmp;
515 }
516}
517
518// ------------------------------------------------------------------------
519void KSaneViewer::clearSelections()
520{
521 clearActiveSelection();
522 clearSavedSelections();
523 updateSelVisibility();
524}
525
526// ------------------------------------------------------------------------
527void KSaneViewer::setMultiselectionEnabled(bool enabled)
528{
529 d->multiSelectionEnabled = enabled;
530 clearSelections();
531 d->selection->setAddButtonEnabled(enabled);
532}
533
534
535// ------------------------------------------------------------------------
536void KSaneViewer::wheelEvent(QWheelEvent *e)
537{
538 if (e->modifiers() == Qt::ControlModifier) {
539 d->wheelDelta += e->angleDelta().y();
540
541 while (d->wheelDelta >= QWheelEvent::DefaultDeltasPerStep) {
542 zoomIn();
543 d->wheelDelta -= QWheelEvent::DefaultDeltasPerStep;
544 }
545
546 while (d->wheelDelta <= -QWheelEvent::DefaultDeltasPerStep) {
547 zoomOut();
548 d->wheelDelta += QWheelEvent::DefaultDeltasPerStep;
549 }
550 } else {
551 QGraphicsView::wheelEvent(e);
552 }
553}
554
555// ------------------------------------------------------------------------
556void KSaneViewer::mousePressEvent(QMouseEvent *e)
557{
558 if (e->button() == Qt::LeftButton) {
559 d->m_left_last_x = e->x();
560 d->m_left_last_y = e->y();
561 QPointF scenePoint = scenePos(e) * d->selection->devicePixelRatio();
562 d->lastSPoint = scenePoint;
563 if (e->modifiers() != Qt::ControlModifier) {
564 if (!d->selection->isVisible()) {
565 d->selection->setVisible(true);
566 d->selection->setRect(QRectF(scenePoint, QSizeF(0, 0)));
567 d->selection->intersects(scenePoint); // just to disable add/remove
568 d->change = SelectionItem::BottomRight;
569 } else if (d->selection->intersects(scenePoint) == SelectionItem::None) {
570 d->selection->setRect(QRectF(scenePoint, QSizeF(0, 0)));
571 d->change = SelectionItem::BottomRight;
572 }
573 updateHighlight();
574 }
575 }
576 QGraphicsView::mousePressEvent(e);
577}
578
579// ------------------------------------------------------------------------
580void KSaneViewer::mouseReleaseEvent(QMouseEvent *e)
581{
582 bool removed = false;
583 if (e->button() == Qt::LeftButton) {
584 if ((d->selection->rect().width() < 0.001) ||
585 (d->selection->rect().height() < 0.001)) {
586 Q_EMIT newSelection(0.0, 0.0, 1.0, 1.0);
587 clearActiveSelection();
588 }
589
590 QPointF scenePoint = scenePos(e) * d->selection->devicePixelRatio();
591 for (int i = 0; i < d->selectionList.size(); i++) {
592 if (d->selectionList[i]->intersects(scenePoint) == SelectionItem::AddRemove) {
593 d->scene->removeItem(d->selectionList[i]);
594 SelectionItem *tmp = d->selectionList[i];
595 d->selectionList.removeAt(i);
596 d->selection->setVisible(true);
597 d->selection->setRect(tmp->rect());
598 d->selection->intersects(scenePoint); // just to enable add/remove
599 delete tmp;
600 removed = true;
601 break;
602 }
603 }
604 if (!removed && (d->selection->intersects(scenePoint) == SelectionItem::AddRemove)) {
605 // add the current selection
606 SelectionItem *tmp = new SelectionItem(d->selection->rect());
607 tmp->setDevicePixelRatio(d->img->devicePixelRatio());
608 d->selectionList.push_back(tmp);
609 d->selectionList.back()->setSaved(true);
610 d->selectionList.back()->saveZoom(transform().m11());
611 d->scene->addItem(d->selectionList.back());
612 d->selectionList.back()->setZValue(9);
613 d->selectionList.back()->intersects(scenePoint);
614
615 // clear the old one
616 Q_EMIT newSelection(0.0, 0.0, 1.0, 1.0);
617 clearActiveSelection();
618 }
619 }
620
621 if ((e->modifiers() != Qt::ControlModifier) &&
622 (d->selection->isVisible()) &&
623 (d->img->width() > 0.001) &&
624 (d->img->height() > 0.001)) {
625 float tlx = d->selection->rect().left() / d->img->width();
626 float tly = d->selection->rect().top() / d->img->height();
627 float brx = d->selection->rect().right() / d->img->width();
628 float bry = d->selection->rect().bottom() / d->img->height();
629
630 Q_EMIT newSelection(tlx, tly, brx, bry);
631 }
632 updateHighlight();
633 QGraphicsView::mouseReleaseEvent(e);
634}
635
636// ------------------------------------------------------------------------
637void KSaneViewer::mouseMoveEvent(QMouseEvent *e)
638{
639 QPointF scenePoint = scenePos(e) * d->selection->devicePixelRatio();
640
641 if (e->buttons()&Qt::LeftButton) {
642 if (e->modifiers() == Qt::ControlModifier) {
643 int dx = e->x() - d->m_left_last_x;
644 int dy = e->y() - d->m_left_last_y;
645 verticalScrollBar()->setValue(verticalScrollBar()->value() - dy);
646 horizontalScrollBar()->setValue(horizontalScrollBar()->value() - dx);
647 d->m_left_last_x = e->x();
648 d->m_left_last_y = e->y();
649 } else {
650 ensureVisible(QRectF(scenePoint, QSizeF(0, 0)), 1, 1);
651 QRectF rect = d->selection->rect();
652 switch (d->change) {
653 case SelectionItem::None:
654 // should not be here :)
655 break;
656 case SelectionItem::Top:
657 if (scenePoint.y() < rect.bottom()) {
658 rect.setTop(scenePoint.y());
659 } else {
660 d->change = SelectionItem::Bottom;
661 rect.setBottom(scenePoint.y());
662 }
663 break;
664 case SelectionItem::TopRight:
665 if (scenePoint.x() > rect.left()) {
666 rect.setRight(scenePoint.x());
667 } else {
668 rect.setLeft(scenePoint.x());
669 d->change = SelectionItem::TopLeft;
670 }
671 if (scenePoint.y() < rect.bottom()) {
672 rect.setTop(scenePoint.y());
673 } else {
674 rect.setBottom(scenePoint.y());
675 d->change = SelectionItem::BottomLeft;
676 } // FIXME arrow
677 break;
678 case SelectionItem::Right:
679 if (scenePoint.x() > rect.left()) {
680 rect.setRight(scenePoint.x());
681 } else {
682 rect.setLeft(scenePoint.x());
683 d->change = SelectionItem::Left;
684 }
685 break;
686 case SelectionItem::BottomRight:
687 if (scenePoint.x() > rect.left()) {
688 rect.setRight(scenePoint.x());
689 } else {
690 rect.setLeft(scenePoint.x());
691 d->change = SelectionItem::BottomLeft;
692 }
693 if (scenePoint.y() > rect.top()) {
694 rect.setBottom(scenePoint.y());
695 } else {
696 rect.setTop(scenePoint.y());
697 d->change = SelectionItem::TopRight;
698 } // FIXME arrow
699 break;
700 case SelectionItem::Bottom:
701 if (scenePoint.y() > rect.top()) {
702 rect.setBottom(scenePoint.y());
703 } else {
704 d->change = SelectionItem::Top;
705 rect.setTop(scenePoint.y());
706 }
707 break;
708 case SelectionItem::BottomLeft:
709 if (scenePoint.x() < rect.right()) {
710 rect.setLeft(scenePoint.x());
711 } else {
712 rect.setRight(scenePoint.x());
713 d->change = SelectionItem::BottomRight;
714 }
715 if (scenePoint.y() > rect.top()) {
716 rect.setBottom(scenePoint.y());
717 } else {
718 rect.setTop(scenePoint.y());
719 d->change = SelectionItem::TopLeft;
720 } // FIXME arrow
721 break;
722 case SelectionItem::Left:
723 if (scenePoint.x() < rect.right()) {
724 rect.setLeft(scenePoint.x());
725 } else {
726 rect.setRight(scenePoint.x());
727 d->change = SelectionItem::Right;
728 }
729 break;
730 case SelectionItem::TopLeft:
731 if (scenePoint.x() < rect.right()) {
732 rect.setLeft(scenePoint.x());
733 } else {
734 rect.setRight(scenePoint.x());
735 d->change = SelectionItem::TopRight;
736 }
737 if (scenePoint.y() < rect.bottom()) {
738 rect.setTop(scenePoint.y());
739 } else {
740 rect.setBottom(scenePoint.y());
741 d->change = SelectionItem::BottomLeft;
742 }// FIXME arrow
743 break;
744 case SelectionItem::Move:
745 rect.translate(d->selection->fixTranslation(scenePoint - d->lastSPoint));
746 break;
747 case SelectionItem::AddRemove:
748 // do nothing
749 break;
750 }
751 d->selection->setRect(rect);
752 }
753 } else if (d->selection->isVisible()) {
754 d->change = d->selection->intersects(scenePoint);
755
756 switch (d->change) {
757 case SelectionItem::None:
758 viewport()->setCursor(Qt::CrossCursor);
759 break;
760 case SelectionItem::Top:
761 viewport()->setCursor(Qt::SizeVerCursor);
762 break;
763 case SelectionItem::TopRight:
764 viewport()->setCursor(Qt::SizeBDiagCursor);
765 break;
766 case SelectionItem::Right:
767 viewport()->setCursor(Qt::SizeHorCursor);
768 break;
769 case SelectionItem::BottomRight:
770 viewport()->setCursor(Qt::SizeFDiagCursor);
771 break;
772 case SelectionItem::Bottom:
773 viewport()->setCursor(Qt::SizeVerCursor);
774 break;
775 case SelectionItem::BottomLeft:
776 viewport()->setCursor(Qt::SizeBDiagCursor);
777 break;
778 case SelectionItem::Left:
779 viewport()->setCursor(Qt::SizeHorCursor);
780 break;
781 case SelectionItem::TopLeft:
782 viewport()->setCursor(Qt::SizeFDiagCursor);
783 break;
784 case SelectionItem::Move:
785 viewport()->setCursor(Qt::SizeAllCursor);
786 break;
787 case SelectionItem::AddRemove:
788 viewport()->setCursor(Qt::ArrowCursor);
789 break;
790 }
791 } else {
792 viewport()->setCursor(Qt::CrossCursor);
793 }
794
795 // now check the selection list
796 for (int i = 0; i < d->selectionList.size(); i++) {
797 if (d->selectionList[i]->intersects(scenePoint) == SelectionItem::AddRemove) {
798 viewport()->setCursor(Qt::ArrowCursor);
799 }
800 }
801
802 d->lastSPoint = scenePoint;
803 updateHighlight();
804 QGraphicsView::mouseMoveEvent(e);
805}
806
807// The change trigger before adding to the sum
808static const int DIFF_TRIGGER = 8;
809
810// The selection start/stop level trigger
811static const int SUM_TRIGGER = 4;
812
813// The selection start/stop level trigger for the floating average
814static const int AVERAGE_TRIGGER = 7;
815
816// The selection start/stop margin
817static const int SEL_MARGIN = 3;
818
819// Maximum number of allowed selections (this could be a settable variable)
820static const int MAX_NUM_SELECTIONS = 8;
821
822// floating average 'div' must be one less than 'count'
823static const int AVERAGE_COUNT = 50;
824static const int AVERAGE_MULT = 49;
825
826// Minimum selection area compared to the whole image
827static const float MIN_AREA_SIZE = 0.01;
828// ------------------------------------------------------------------------
829void KSaneViewer::findSelections(float area)
830{
831 // Reduce the size of the image to decrease noise and calculation time
832 float multiplier = sqrt(area / (d->img->height() * d->img->width()));
833
834 int width = (int)(d->img->width() * multiplier);
835 int height = (int)(d->img->height() * multiplier);
836
837 QImage img = d->img->scaled(width, height, Qt::KeepAspectRatio);
838 height = img.height(); // the size was probably not exact
839 width = img.width();
840
841 QVector<qint64> colSums(width + SEL_MARGIN + 1);
842 qint64 rowSum;
843 colSums.fill(0);
844 int pix;
845 int diff;
846 int hSelStart = -1;
847 int hSelEnd = -1;
848 int hSelMargin = 0;
849 int wSelStart = -1;
850 int wSelEnd = -1;
851 int wSelMargin = 0;
852
853 for (int h = 1; h < height; h++) {
854 rowSum = 0;
855 if (h < height - 1) {
856 // Special case for the left most pixel
857 pix = qGray(img.pixel(0, h));
858 diff = qAbs(pix - qGray(img.pixel(1, h)));
859 diff += qAbs(pix - qGray(img.pixel(0, h - 1)));
860 diff += qAbs(pix - qGray(img.pixel(0, h + 1)));
861 if (diff > DIFF_TRIGGER) {
862 colSums[0] += diff;
863 rowSum += diff;
864 }
865
866 // Special case for the right most pixel
867 pix = qGray(img.pixel(width - 1, h));
868 diff = qAbs(pix - qGray(img.pixel(width - 2, h)));
869 diff += qAbs(pix - qGray(img.pixel(width - 1, h - 1)));
870 diff += qAbs(pix - qGray(img.pixel(width - 1, h + 1)));
871 if (diff > DIFF_TRIGGER) {
872 colSums[width - 1] += diff;
873 rowSum += diff;
874 }
875
876 for (int w = 1; w < (width - 1); w++) {
877 pix = qGray(img.pixel(w, h));
878 diff = 0;
879 // how much does the pixel differ from the surrounding
880 diff += qAbs(pix - qGray(img.pixel(w - 1, h)));
881 diff += qAbs(pix - qGray(img.pixel(w + 1, h)));
882 diff += qAbs(pix - qGray(img.pixel(w, h - 1)));
883 diff += qAbs(pix - qGray(img.pixel(w, h + 1)));
884 if (diff > DIFF_TRIGGER) {
885 colSums[w] += diff;
886 rowSum += diff;
887 }
888 }
889 }
890
891 if ((rowSum / width) > SUM_TRIGGER) {
892 if (hSelStart < 0) {
893 if (hSelMargin < SEL_MARGIN) {
894 hSelMargin++;
895 }
896 if (hSelMargin == SEL_MARGIN) {
897 hSelStart = h - SEL_MARGIN + 1;
898 }
899 }
900 } else {
901 if (hSelStart >= 0) {
902 if (hSelMargin > 0) {
903 hSelMargin--;
904 }
905 }
906 if ((hSelStart > -1) && ((hSelMargin == 0) || (h == height - 1))) {
907 if (h == height - 1) {
908 hSelEnd = h - hSelMargin;
909 } else {
910 hSelEnd = h - SEL_MARGIN;
911 }
912 // We have the end of the vertical selection
913 // now figure out the horizontal part of the selection
914 for (int w = 0; w <= width; w++) { // colSums[width] will be 0
915 if ((colSums[w] / (h - hSelStart)) > SUM_TRIGGER) {
916 if (wSelStart < 0) {
917 if (wSelMargin < SEL_MARGIN) {
918 wSelMargin++;
919 }
920 if (wSelMargin == SEL_MARGIN) {
921 wSelStart = w - SEL_MARGIN + 1;
922 }
923 }
924 } else {
925 if (wSelStart >= 0) {
926 if (wSelMargin > 0) {
927 wSelMargin--;
928 }
929 }
930 if ((wSelStart >= 0) && ((wSelMargin == 0) || (w == width))) {
931 if (w == width) {
932 wSelEnd = width;
933 } else {
934 wSelEnd = w - SEL_MARGIN + 1;
935 }
936
937 // we have the end of a horizontal selection
938 if ((wSelEnd - wSelStart) < width) {
939 // skip selections that span the whole width
940 // calculate the coordinates in the original size
941 int x1 = wSelStart / multiplier;
942 int y1 = hSelStart / multiplier;
943 int x2 = wSelEnd / multiplier;
944 int y2 = hSelEnd / multiplier;
945 float selArea = (float)(wSelEnd - wSelStart) * (float)(hSelEnd - hSelStart);
946 if (selArea > (area * MIN_AREA_SIZE)) {
947 SelectionItem *tmp = new SelectionItem(QRect(QPoint(x1, y1), QPoint(x2, y2)));
948 tmp->setDevicePixelRatio(d->img->devicePixelRatio());
949 d->selectionList.push_back(tmp);
950 d->selectionList.back()->setSaved(true);
951 d->selectionList.back()->saveZoom(transform().m11());
952 d->scene->addItem(d->selectionList.back());
953 d->selectionList.back()->setZValue(9);
954 }
955 }
956 wSelStart = -1;
957 wSelEnd = -1;
958 (void)hSelEnd; // clang static analyzer report hSelEnd is never used.
959 wSelMargin = 0;
960 }
961 }
962 }
963 hSelStart = -1;
964 hSelEnd = -1;
965 hSelMargin = 0;
966 colSums.fill(0);
967 }
968 }
969 }
970
971 if (d->selectionList.size() > MAX_NUM_SELECTIONS) {
972 // smaller area or should we give up??
973 clearSavedSelections();
974 //findSelections(area/2);
975 // instead of trying to find probably broken selections just give up
976 // and do not force broken selections on the user.
977 } else {
978 // 1/multiplier is the error margin caused by the resolution reduction
979 refineSelections(qRound(1 / multiplier));
980 // check that the selections are big enough
981 float minArea = d->img->height() * d->img->width() * MIN_AREA_SIZE;
982
983 int i = 0;
984 while (i < d->selectionList.size()) {
985 if ((d->selectionList[i]->rect().width() * d->selectionList[i]->rect().height()) < minArea) {
986 d->scene->removeItem(d->selectionList[i]);
987 d->selectionList.removeAt(i);
988 } else {
989 i++;
990 }
991 }
992 }
993}
994
995QSize KSaneViewer::sizeHint() const
996{
997 return QSize(250, 300); // a sensible size for a scan preview
998}
999
1000void KSaneViewer::refineSelections(int pixelMargin)
1001{
1002 // The end result
1003 int hSelStart;
1004 int hSelEnd;
1005 int wSelStart;
1006 int wSelEnd;
1007
1008 for (int i = 0; i < d->selectionList.size(); i++) {
1009 QRectF selRect = d->selectionList.at(i)->rect();
1010
1011 // original values
1012 hSelStart = (int)selRect.top();
1013 hSelEnd = (int)selRect.bottom();
1014 wSelStart = (int)selRect.left();
1015 wSelEnd = (int)selRect.right();
1016
1017 // Top
1018 // Too long iteration should not be a problem since the loop should be interrupted by the limit
1019 hSelStart = refineRow(hSelStart - pixelMargin, hSelEnd, wSelStart, wSelEnd);
1020
1021 // Bottom (from the bottom up wards)
1022 hSelEnd = refineRow(hSelEnd + pixelMargin, hSelStart, wSelStart, wSelEnd);
1023
1024 // Left
1025 wSelStart = refineColumn(wSelStart - pixelMargin, wSelEnd, hSelStart, hSelEnd);
1026
1027 // Right
1028 wSelEnd = refineColumn(wSelEnd + pixelMargin, wSelStart, hSelStart, hSelEnd);
1029
1030 // Now update the selection
1031 d->selectionList.at(i)->setRect(QRectF(QPointF(wSelStart, hSelStart), QPointF(wSelEnd, hSelEnd)));
1032 }
1033}
1034
1035int KSaneViewer::refineRow(int fromRow, int toRow, int colStart, int colEnd)
1036{
1037 int pix;
1038 int diff;
1039 float rowTrigger;
1040 int row;
1041 int addSub = (fromRow < toRow) ? 1 : -1;
1042
1043 colStart -= 2; //add some margin
1044 colEnd += 2; //add some margin
1045
1046 if (colStart < 1) {
1047 colStart = 1;
1048 }
1049 if (colEnd >= d->img->width() - 1) {
1050 colEnd = d->img->width() - 2;
1051 }
1052
1053 if (fromRow < 1) {
1054 fromRow = 1;
1055 }
1056 if (fromRow >= d->img->height() - 1) {
1057 fromRow = d->img->height() - 2;
1058 }
1059
1060 if (toRow < 1) {
1061 toRow = 1;
1062 }
1063 if (toRow >= d->img->height() - 1) {
1064 toRow = d->img->height() - 2;
1065 }
1066
1067 row = fromRow;
1068 while (row != toRow) {
1069 rowTrigger = 0;
1070 for (int w = colStart; w < colEnd; w++) {
1071 diff = 0;
1072 pix = qGray(d->img->pixel(w, row));
1073 // how much does the pixel differ from the surrounding
1074 diff += qAbs(pix - qGray(d->img->pixel(w - 1, row)));
1075 diff += qAbs(pix - qGray(d->img->pixel(w + 1, row)));
1076 diff += qAbs(pix - qGray(d->img->pixel(w, row - 1)));
1077 diff += qAbs(pix - qGray(d->img->pixel(w, row + 1)));
1078 if (diff <= DIFF_TRIGGER) {
1079 diff = 0;
1080 }
1081
1082 rowTrigger = ((rowTrigger * AVERAGE_MULT) + diff) / AVERAGE_COUNT;
1083
1084 if (rowTrigger > AVERAGE_TRIGGER) {
1085 break;
1086 }
1087 }
1088
1089 if (rowTrigger > AVERAGE_TRIGGER) {
1090 // row == 1 _probably_ means that the selection should start from 0
1091 // but that can not be detected if we start from 1 => include one extra column
1092 if (row == 1) {
1093 row = 0;
1094 }
1095 if (row == (d->img->width() - 2)) {
1096 row = d->img->width();
1097 }
1098 return row;
1099 }
1100 row += addSub;
1101 }
1102 return row;
1103}
1104
1105int KSaneViewer::refineColumn(int fromCol, int toCol, int rowStart, int rowEnd)
1106{
1107 int pix;
1108 int diff;
1109 float colTrigger;
1110 int col;
1111 int count;
1112 int addSub = (fromCol < toCol) ? 1 : -1;
1113
1114 rowStart -= 2; //add some margin
1115 rowEnd += 2; //add some margin
1116
1117 if (rowStart < 1) {
1118 rowStart = 1;
1119 }
1120 if (rowEnd >= d->img->height() - 1) {
1121 rowEnd = d->img->height() - 2;
1122 }
1123
1124 if (fromCol < 1) {
1125 fromCol = 1;
1126 }
1127 if (fromCol >= d->img->width() - 1) {
1128 fromCol = d->img->width() - 2;
1129 }
1130
1131 if (toCol < 1) {
1132 toCol = 1;
1133 }
1134 if (toCol >= d->img->width() - 1) {
1135 toCol = d->img->width() - 2;
1136 }
1137
1138 col = fromCol;
1139 while (col != toCol) {
1140 colTrigger = 0;
1141 count = 0;
1142 for (int row = rowStart; row < rowEnd; row++) {
1143 count++;
1144 diff = 0;
1145 pix = qGray(d->img->pixel(col, row));
1146 // how much does the pixel differ from the surrounding
1147 diff += qAbs(pix - qGray(d->img->pixel(col - 1, row)));
1148 diff += qAbs(pix - qGray(d->img->pixel(col + 1, row)));
1149 diff += qAbs(pix - qGray(d->img->pixel(col, row - 1)));
1150 diff += qAbs(pix - qGray(d->img->pixel(col, row + 1)));
1151 if (diff <= DIFF_TRIGGER) {
1152 diff = 0;
1153 }
1154
1155 colTrigger = ((colTrigger * AVERAGE_MULT) + diff) / AVERAGE_COUNT;
1156
1157 if (colTrigger > AVERAGE_TRIGGER) {
1158 break;
1159 }
1160 }
1161
1162 if (colTrigger > AVERAGE_TRIGGER) {
1163 // col == 1 _probably_ means that the selection should start from 0
1164 // but that can not be detected if we start from 1 => include one extra column
1165 if (col == 1) {
1166 col = 0;
1167 }
1168 if (col == (d->img->width() - 2)) {
1169 col = d->img->width();
1170 }
1171 return col;
1172 }
1173 col += addSub;
1174 }
1175 return col;
1176}
1177
1178QPointF KSaneViewer::scenePos(QMouseEvent *e) const
1179{
1180 // QGraphicsView::mapToScene() maps only QPoints, but in highdpi mode we want
1181 // to deal with non-rounded coordinates, that's why QPainterPath wrapper is used.
1182 // QMouseEvent::localPos() currently returns a rounded QPointF
1183 // (https://codereview.qt-project.org/259785), so we have to extract a fractional
1184 // part from QMouseEvent::screenPos().
1185 const QPointF screenPos = e->screenPos();
1186 QPointF delta = screenPos - screenPos.toPoint();
1187 return mapToScene(QPainterPath(e->pos() + delta)).currentPosition();
1188}
1189
1190} // NameSpace KSaneIface
1191
1192#include "moc_ksaneviewer.cpp"
i18n
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