File indexing completed on 2024-04-28 04:33:06

 /*
     SPDX-FileCopyrightText: 2005 Enrico Ros <eros.kde@email.it>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "pagepainter.h"
 
 // qt / kde includes
 #include <QApplication>
 #include <QDebug>
 #include <QIcon>
 #include <QPainter>
 #include <QPalette>
 #include <QPixmap>
 #include <QRect>
 #include <QTransform>
 #include <QVarLengthArray>
 
 // system includes
 #include <math.h>
 
 // local includes
 #include "core/annotations.h"
 #include "core/observer.h"
 #include "core/page.h"
 #include "core/page_p.h"
 #include "core/tile.h"
 #include "core/utils.h"
 #include "debug_ui.h"
 #include "guiutils.h"
 #include "settings.h"
 #include "settings_core.h"
 
 Q_GLOBAL_STATIC_WITH_ARGS(QPixmap, busyPixmap, (QIcon::fromTheme(QLatin1String("okular")).pixmap(48)))
 
 #define TEXTANNOTATION_ICONSIZE 24
 
 inline QPen buildPen(const Okular::Annotation *ann, double width, const QColor &color)
 {
     QColor c = color;
     c.setAlphaF(ann->style().opacity());
     QPen p(QBrush(c), width, ann->style().lineStyle() == Okular::Annotation::Dashed ? Qt::DashLine : Qt::SolidLine, Qt::SquareCap, Qt::MiterJoin);
     return p;
 }
 
 void PagePainter::paintPageOnPainter(QPainter *destPainter, const Okular::Page *page, Okular::DocumentObserver *observer, int flags, int scaledWidth, int scaledHeight, const QRect limits)
 {
     paintCroppedPageOnPainter(destPainter, page, observer, flags, scaledWidth, scaledHeight, limits, Okular::NormalizedRect(0, 0, 1, 1), nullptr);
 }
 
 void PagePainter::paintCroppedPageOnPainter(QPainter *destPainter,
                                             const Okular::Page *page,
                                             Okular::DocumentObserver *observer,
                                             int flags,
                                             int scaledWidth,
                                             int scaledHeight,
                                             const QRect limits,
                                             const Okular::NormalizedRect &crop,
                                             Okular::NormalizedPoint *viewPortPoint)
 {
     qreal dpr = destPainter->device()->devicePixelRatioF();
 
     /* Calculate the cropped geometry of the page */
     QRect scaledCrop = crop.geometry(scaledWidth, scaledHeight);
 
     /* variables prefixed with d are in the device pixels coordinate system, which translates to the rendered output - that means,
      * multiplied with the device pixel ratio of the target PaintDevice */
     const QRect dScaledCrop(QRectF(scaledCrop.x() * dpr, scaledCrop.y() * dpr, scaledCrop.width() * dpr, scaledCrop.height() * dpr).toAlignedRect());
 
     int croppedWidth = scaledCrop.width();
     int croppedHeight = scaledCrop.height();
 
     int dScaledWidth = ceil(scaledWidth * dpr);
     int dScaledHeight = ceil(scaledHeight * dpr);
     const QRect dLimits(QRectF(limits.x() * dpr, limits.y() * dpr, limits.width() * dpr, limits.height() * dpr).toAlignedRect());
 
     QColor paperColor = Qt::white;
     QColor backgroundColor = paperColor;
     if (Okular::SettingsCore::changeColors()) {
         switch (Okular::SettingsCore::renderMode()) {
         case Okular::SettingsCore::EnumRenderMode::Inverted:
         case Okular::SettingsCore::EnumRenderMode::InvertLightness:
         case Okular::SettingsCore::EnumRenderMode::InvertLuma:
         case Okular::SettingsCore::EnumRenderMode::InvertLumaSymmetric:
             backgroundColor = Qt::black;
             break;
         case Okular::SettingsCore::EnumRenderMode::Paper:
             paperColor = Okular::SettingsCore::paperColor();
             backgroundColor = paperColor;
             break;
         case Okular::SettingsCore::EnumRenderMode::Recolor:
             backgroundColor = Okular::Settings::recolorBackground();
             break;
         default:;
         }
     }
     destPainter->fillRect(limits, backgroundColor);
 
     const bool hasTilesManager = page->hasTilesManager(observer);
     QPixmap pixmap;
 
     if (!hasTilesManager) {
         /** 1 - RETRIEVE THE 'PAGE+ID' PIXMAP OR A SIMILAR 'PAGE' ONE **/
         const QPixmap *p = page->_o_nearestPixmap(observer, dScaledWidth, dScaledHeight);
 
         if (p != nullptr) {
             pixmap = *p;
         }
 
         /** 1B - IF NO PIXMAP, DRAW EMPTY PAGE **/
         double pixmapRescaleRatio = !pixmap.isNull() ? dScaledWidth / (double)pixmap.width() : -1;
         long pixmapPixels = !pixmap.isNull() ? (long)pixmap.width() * (long)pixmap.height() : 0;
         if (pixmap.isNull() || pixmapRescaleRatio > 20.0 || pixmapRescaleRatio < 0.25 || (dScaledWidth > pixmap.width() && pixmapPixels > 60000000L)) {
             // draw something on the blank page: the okular icon or a cross (as a fallback)
             if (!busyPixmap()->isNull()) {
                 busyPixmap->setDevicePixelRatio(dpr);
                 destPainter->drawPixmap(QPoint(10, 10), *busyPixmap());
             } else {
                 destPainter->setPen(Qt::gray);
                 destPainter->drawLine(0, 0, croppedWidth - 1, croppedHeight - 1);
                 destPainter->drawLine(0, croppedHeight - 1, croppedWidth - 1, 0);
             }
             return;
         }
     }
 
     /** 2 - FIND OUT WHAT TO PAINT (Flags + Configuration + Presence) **/
     bool canDrawHighlights = (flags & Highlights) && !page->m_highlights.isEmpty();
     bool canDrawTextSelection = (flags & TextSelection) && page->textSelection();
     bool canDrawAnnotations = (flags & Annotations) && !page->m_annotations.isEmpty();
     bool enhanceLinks = (flags & EnhanceLinks) && Okular::Settings::highlightLinks();
     bool enhanceImages = (flags & EnhanceImages) && Okular::Settings::highlightImages();
 
     // vectors containing objects to draw
     // make this a qcolor, rect map, since we don't need
     // to know s_id here! we are only drawing this right?
     QList<QPair<QColor, Okular::NormalizedRect>> *bufferedHighlights = nullptr;
     QList<Okular::Annotation *> *bufferedAnnotations = nullptr;
     QList<Okular::Annotation *> *unbufferedAnnotations = nullptr;
     Okular::Annotation *boundingRectOnlyAnn = nullptr; // Paint the bounding rect of this annotation
     // fill up lists with visible annotation/highlight objects/text selections
     if (canDrawHighlights || canDrawTextSelection || canDrawAnnotations) {
         // precalc normalized 'limits rect' for intersection
         double nXMin = ((double)limits.left() / scaledWidth) + crop.left, nXMax = ((double)limits.right() / scaledWidth) + crop.left, nYMin = ((double)limits.top() / scaledHeight) + crop.top,
                nYMax = ((double)limits.bottom() / scaledHeight) + crop.top;
         // append all highlights inside limits to their list
         if (canDrawHighlights) {
             if (!bufferedHighlights) {
                 bufferedHighlights = new QList<QPair<QColor, Okular::NormalizedRect>>();
             }
             /*            else
                         {*/
 
             Okular::NormalizedRect *limitRect = new Okular::NormalizedRect(nXMin, nYMin, nXMax, nYMax);
             Okular::HighlightAreaRect::const_iterator hIt;
             for (const Okular::HighlightAreaRect *highlight : page->m_highlights) {
                 for (hIt = highlight->constBegin(); hIt != highlight->constEnd(); ++hIt) {
                     if ((*hIt).intersects(limitRect)) {
                         bufferedHighlights->append(qMakePair(highlight->color, *hIt));
                     }
                 }
             }
             delete limitRect;
             //}
         }
         if (canDrawTextSelection) {
             if (!bufferedHighlights) {
                 bufferedHighlights = new QList<QPair<QColor, Okular::NormalizedRect>>();
             }
             /*            else
                         {*/
             Okular::NormalizedRect *limitRect = new Okular::NormalizedRect(nXMin, nYMin, nXMax, nYMax);
             const Okular::RegularAreaRect *textSelection = page->textSelection();
             Okular::HighlightAreaRect::const_iterator hIt = textSelection->constBegin(), hEnd = textSelection->constEnd();
             for (; hIt != hEnd; ++hIt) {
                 if ((*hIt).intersects(limitRect)) {
                     bufferedHighlights->append(qMakePair(page->textSelectionColor(), *hIt));
                 }
             }
             delete limitRect;
             //}
         }
         // append annotations inside limits to the un/buffered list
         if (canDrawAnnotations) {
             for (Okular::Annotation *ann : page->m_annotations) {
                 int flags = ann->flags();
 
                 if (flags & Okular::Annotation::Hidden) {
                     continue;
                 }
 
                 if (flags & Okular::Annotation::ExternallyDrawn) {
                     // ExternallyDrawn annots are never rendered by PagePainter.
                     // Just paint the boundingRect if the annot is moved or resized.
                     if (flags & (Okular::Annotation::BeingMoved | Okular::Annotation::BeingResized)) {
                         boundingRectOnlyAnn = ann;
                     }
                     continue;
                 }
 
                 bool intersects = ann->transformedBoundingRectangle().intersects(nXMin, nYMin, nXMax, nYMax);
                 if (ann->subType() == Okular::Annotation::AText) {
                     Okular::TextAnnotation *ta = static_cast<Okular::TextAnnotation *>(ann);
                     if (ta->textType() == Okular::TextAnnotation::Linked) {
                         Okular::NormalizedRect iconrect(ann->transformedBoundingRectangle().left,
                                                         ann->transformedBoundingRectangle().top,
                                                         ann->transformedBoundingRectangle().left + TEXTANNOTATION_ICONSIZE / page->width(),
                                                         ann->transformedBoundingRectangle().top + TEXTANNOTATION_ICONSIZE / page->height());
                         intersects = iconrect.intersects(nXMin, nYMin, nXMax, nYMax);
                     }
                 }
                 if (intersects) {
                     Okular::Annotation::SubType type = ann->subType();
                     if (type == Okular::Annotation::ALine || type == Okular::Annotation::AHighlight || type == Okular::Annotation::AInk /*|| (type == Annotation::AGeom && ann->style().opacity() < 0.99)*/) {
                         if (!bufferedAnnotations) {
                             bufferedAnnotations = new QList<Okular::Annotation *>();
                         }
                         bufferedAnnotations->append(ann);
                     } else {
                         if (!unbufferedAnnotations) {
                             unbufferedAnnotations = new QList<Okular::Annotation *>();
                         }
                         unbufferedAnnotations->append(ann);
                     }
                 }
             }
         }
         // end of intersections checking
     }
 
     /** 3 - ENABLE BACKBUFFERING IF DIRECT IMAGE MANIPULATION IS NEEDED **/
     bool bufferAccessibility = (flags & Accessibility) && Okular::SettingsCore::changeColors() && (Okular::SettingsCore::renderMode() != Okular::SettingsCore::EnumRenderMode::Paper);
     bool useBackBuffer = bufferAccessibility || bufferedHighlights || bufferedAnnotations || viewPortPoint;
     QPixmap *backPixmap = nullptr;
     QPainter *mixedPainter = nullptr;
     QRect limitsInPixmap = limits.translated(scaledCrop.topLeft());
     QRect dLimitsInPixmap = dLimits.translated(dScaledCrop.topLeft());
 
     // limits within full (scaled but uncropped) pixmap
 
     /** 4A -- REGULAR FLOW. PAINT PIXMAP NORMAL OR RESCALED USING GIVEN QPAINTER **/
     if (!useBackBuffer) {
         if (hasTilesManager) {
             const Okular::NormalizedRect normalizedLimits(limitsInPixmap, scaledWidth, scaledHeight);
             const QList<Okular::Tile> tiles = page->tilesAt(observer, normalizedLimits);
             QList<Okular::Tile>::const_iterator tIt = tiles.constBegin(), tEnd = tiles.constEnd();
             while (tIt != tEnd) {
                 const Okular::Tile &tile = *tIt;
                 QRectF tileRect = tile.rect().geometryF(scaledWidth, scaledHeight).translated(-scaledCrop.topLeft());
                 QRect dTileRect = tile.rect().geometry(dScaledWidth, dScaledHeight).translated(-dScaledCrop.topLeft());
                 QRectF limitsInTile = QRectF(limits) & tileRect;
                 QRect dLimitsInTile = dLimits & dTileRect;
 
                 if (!limitsInTile.isEmpty()) {
                     QPixmap *tilePixmap = tile.pixmap();
 
                     if (tilePixmap->width() == dTileRect.width() && tilePixmap->height() == dTileRect.height()) {
                         destPainter->drawPixmap(limitsInTile, *tilePixmap, dLimitsInTile.translated(-dTileRect.topLeft()));
                     } else {
                         destPainter->drawPixmap(tileRect, *tilePixmap, tilePixmap->rect());
                     }
                 }
                 tIt++;
             }
         } else {
             destPainter->drawPixmap(limits, pixmap.scaled(dScaledWidth, dScaledHeight), dLimitsInPixmap);
         }
 
         // 4A.2. active painter is the one passed to this method
         mixedPainter = destPainter;
     }
     /** 4B -- BUFFERED FLOW. IMAGE PAINTING + OPERATIONS. QPAINTER OVER PIXMAP  **/
     else {
         // the image over which we are going to draw
         QImage backImage = QImage(dLimits.width(), dLimits.height(), QImage::Format_ARGB32_Premultiplied);
         backImage.setDevicePixelRatio(dpr);
         backImage.fill(paperColor);
         QPainter p(&backImage);
 
         if (hasTilesManager) {
             const Okular::NormalizedRect normalizedLimits(limitsInPixmap, scaledWidth, scaledHeight);
             const QList<Okular::Tile> tiles = page->tilesAt(observer, normalizedLimits);
             QList<Okular::Tile>::const_iterator tIt = tiles.constBegin(), tEnd = tiles.constEnd();
             while (tIt != tEnd) {
                 const Okular::Tile &tile = *tIt;
                 QRectF tileRect = tile.rect().geometryF(scaledWidth, scaledHeight).translated(-scaledCrop.topLeft());
                 QRect dTileRect = tile.rect().geometry(dScaledWidth, dScaledHeight).translated(-dScaledCrop.topLeft());
                 QRectF limitsInTile = QRectF(limits) & tileRect;
                 QRect dLimitsInTile = dLimits & dTileRect;
 
                 if (!limitsInTile.isEmpty()) {
                     QPixmap *tilePixmap = tile.pixmap();
 
                     if (tilePixmap->width() == dTileRect.width() && tilePixmap->height() == dTileRect.height()) {
                         p.drawPixmap(limitsInTile.translated(-limits.topLeft()), *tilePixmap, dLimitsInTile.translated(-dTileRect.topLeft()));
                     } else {
                         double xScale = tilePixmap->width() / (double)dTileRect.width();
                         double yScale = tilePixmap->height() / (double)dTileRect.height();
                         QTransform transform(xScale, 0, 0, yScale, 0, 0);
                         p.drawPixmap(limitsInTile.translated(-limits.topLeft()), *tilePixmap, transform.mapRect(dLimitsInTile).translated(-transform.mapRect(dTileRect).topLeft()));
                     }
                 }
                 ++tIt;
             }
         } else {
             // 4B.1. draw the page pixmap: normal or scaled
 
             p.drawPixmap(QRectF(0, 0, limits.width(), limits.height()), pixmap.scaled(dScaledWidth, dScaledHeight), dLimitsInPixmap);
         }
 
         p.end();
 
         // 4B.2. modify pixmap following accessibility settings
         if (bufferAccessibility) {
             switch (Okular::SettingsCore::renderMode()) {
             case Okular::SettingsCore::EnumRenderMode::Inverted:
                 // Invert image pixels using QImage internal function
                 backImage.invertPixels(QImage::InvertRgb);
                 break;
             case Okular::SettingsCore::EnumRenderMode::Recolor:
                 recolor(&backImage, Okular::Settings::recolorForeground(), Okular::Settings::recolorBackground());
                 break;
             case Okular::SettingsCore::EnumRenderMode::BlackWhite:
                 blackWhite(&backImage, Okular::Settings::bWContrast(), Okular::Settings::bWThreshold());
                 break;
             case Okular::SettingsCore::EnumRenderMode::InvertLightness:
                 invertLightness(&backImage);
                 break;
             case Okular::SettingsCore::EnumRenderMode::InvertLuma:
                 invertLuma(&backImage, 0.2126, 0.7152, 0.0722); // sRGB / Rec. 709 luma coefficients
                 break;
             case Okular::SettingsCore::EnumRenderMode::InvertLumaSymmetric:
                 invertLuma(&backImage, 0.3333, 0.3334, 0.3333); // Symmetric coefficients, to keep colors saturated.
                 break;
             case Okular::SettingsCore::EnumRenderMode::HueShiftPositive:
                 hueShiftPositive(&backImage);
                 break;
             case Okular::SettingsCore::EnumRenderMode::HueShiftNegative:
                 hueShiftNegative(&backImage);
                 break;
             }
         }
 
         // 4B.3. highlight rects in page
         if (bufferedHighlights) {
             // draw highlights that are inside the 'limits' paint region
             for (const auto &highlight : std::as_const(*bufferedHighlights)) {
                 const Okular::NormalizedRect &r = highlight.second;
                 // find out the rect to highlight on pixmap
                 QRect highlightRect = r.geometry(scaledWidth, scaledHeight).translated(-scaledCrop.topLeft()).intersected(limits);
                 highlightRect.translate(-limits.left(), -limits.top());
 
                 const QColor highlightColor = highlight.first;
                 QPainter painter(&backImage);
                 painter.setCompositionMode(QPainter::CompositionMode_Multiply);
                 painter.fillRect(highlightRect, highlightColor);
 
                 auto frameColor = highlightColor.darker(150);
                 const QRect frameRect = r.geometry(scaledWidth, scaledHeight).translated(-scaledCrop.topLeft()).translated(-limits.left(), -limits.top());
                 painter.setPen(frameColor);
                 painter.drawRect(frameRect);
             }
         }
 
         // 4B.4. paint annotations [COMPOSITED ONES]
         if (bufferedAnnotations) {
             // Albert: This is quite "heavy" but all the backImage that reach here are QImage::Format_ARGB32_Premultiplied
             // and have to be so that the QPainter::CompositionMode_Multiply works
             // we could also put a
             // backImage = backImage.convertToFormat(QImage::Format_ARGB32_Premultiplied)
             // that would be almost a noop, but we'll leave the assert for now
             Q_ASSERT(backImage.format() == QImage::Format_ARGB32_Premultiplied);
             // precalc constants for normalizing [0,1] page coordinates into normalized [0,1] limit rect coordinates
             double pageScale = (double)croppedWidth / page->width();
             double xOffset = (double)limits.left() / (double)scaledWidth + crop.left, xScale = (double)scaledWidth / (double)limits.width(), yOffset = (double)limits.top() / (double)scaledHeight + crop.top,
                    yScale = (double)scaledHeight / (double)limits.height();
 
             // paint all buffered annotations in the page
             QList<Okular::Annotation *>::const_iterator aIt = bufferedAnnotations->constBegin(), aEnd = bufferedAnnotations->constEnd();
             for (; aIt != aEnd; ++aIt) {
                 Okular::Annotation *a = *aIt;
                 Okular::Annotation::SubType type = a->subType();
                 QColor acolor = a->style().color();
                 if (!acolor.isValid()) {
                     acolor = Qt::yellow;
                 }
                 acolor.setAlphaF(a->style().opacity());
 
                 // draw LineAnnotation MISSING: caption, dash pattern, endings for multipoint lines
                 if (type == Okular::Annotation::ALine) {
                     LineAnnotPainter linepainter {(Okular::LineAnnotation *)a, {page->width(), page->height()}, pageScale, {xScale, 0., 0., yScale, -xOffset * xScale, -yOffset * yScale}};
                     linepainter.draw(backImage);
                 }
                 // draw HighlightAnnotation MISSING: under/strike width, feather, capping
                 else if (type == Okular::Annotation::AHighlight) {
                     // get the annotation
                     Okular::HighlightAnnotation *ha = (Okular::HighlightAnnotation *)a;
                     Okular::HighlightAnnotation::HighlightType type = ha->highlightType();
 
                     // draw each quad of the annotation
                     int quads = ha->highlightQuads().size();
                     for (int q = 0; q < quads; q++) {
                         NormalizedPath path;
                         const Okular::HighlightAnnotation::Quad &quad = ha->highlightQuads()[q];
                         // normalize page point to image
                         for (int i = 0; i < 4; i++) {
                             Okular::NormalizedPoint point;
                             point.x = (quad.transformedPoint(i).x - xOffset) * xScale;
                             point.y = (quad.transformedPoint(i).y - yOffset) * yScale;
                             path.append(point);
                         }
                         // draw the normalized path into image
                         switch (type) {
                         // highlight the whole rect
                         case Okular::HighlightAnnotation::Highlight:
                             drawShapeOnImage(backImage, path, true, Qt::NoPen, acolor, pageScale, Multiply);
                             break;
                         // highlight the bottom part of the rect
                         case Okular::HighlightAnnotation::Squiggly:
                             path[3].x = (path[0].x + path[3].x) / 2.0;
                             path[3].y = (path[0].y + path[3].y) / 2.0;
                             path[2].x = (path[1].x + path[2].x) / 2.0;
                             path[2].y = (path[1].y + path[2].y) / 2.0;
                             drawShapeOnImage(backImage, path, true, Qt::NoPen, acolor, pageScale, Multiply);
                             break;
                         // make a line at 3/4 of the height
                         case Okular::HighlightAnnotation::Underline:
                             path[0].x = (3 * path[0].x + path[3].x) / 4.0;
                             path[0].y = (3 * path[0].y + path[3].y) / 4.0;
                             path[1].x = (3 * path[1].x + path[2].x) / 4.0;
                             path[1].y = (3 * path[1].y + path[2].y) / 4.0;
                             path.pop_back();
                             path.pop_back();
                             drawShapeOnImage(backImage, path, false, QPen(acolor, 2), QBrush(), pageScale);
                             break;
                         // make a line at 1/2 of the height
                         case Okular::HighlightAnnotation::StrikeOut:
                             path[0].x = (path[0].x + path[3].x) / 2.0;
                             path[0].y = (path[0].y + path[3].y) / 2.0;
                             path[1].x = (path[1].x + path[2].x) / 2.0;
                             path[1].y = (path[1].y + path[2].y) / 2.0;
                             path.pop_back();
                             path.pop_back();
                             drawShapeOnImage(backImage, path, false, QPen(acolor, 2), QBrush(), pageScale);
                             break;
                         }
                     }
                 }
                 // draw InkAnnotation MISSING:invar width, PENTRACER
                 else if (type == Okular::Annotation::AInk) {
                     // get the annotation
                     Okular::InkAnnotation *ia = (Okular::InkAnnotation *)a;
 
                     // draw each ink path
                     const QList<QList<Okular::NormalizedPoint>> transformedInkPaths = ia->transformedInkPaths();
 
                     const QPen inkPen = buildPen(a, a->style().width(), acolor);
 
                     for (const QList<Okular::NormalizedPoint> &inkPath : transformedInkPaths) {
                         // normalize page point to image
                         NormalizedPath path;
                         for (const Okular::NormalizedPoint &inkPoint : inkPath) {
                             Okular::NormalizedPoint point;
                             point.x = (inkPoint.x - xOffset) * xScale;
                             point.y = (inkPoint.y - yOffset) * yScale;
                             path.append(point);
                         }
                         // draw the normalized path into image
                         drawShapeOnImage(backImage, path, false, inkPen, QBrush(), pageScale);
                     }
                 }
             } // end current annotation drawing
         }
         if (viewPortPoint) {
             QPainter painter(&backImage);
             painter.translate(-limits.left(), -limits.top());
             painter.setPen(QApplication::palette().color(QPalette::Active, QPalette::Highlight));
             painter.drawLine(0, viewPortPoint->y * scaledHeight + 1, scaledWidth - 1, viewPortPoint->y * scaledHeight + 1);
             // ROTATION CURRENTLY NOT IMPLEMENTED
             /*
                         if( page->rotation() == Okular::Rotation0)
                         {
 
                         }
                         else if(page->rotation() == Okular::Rotation270)
                         {
                             painter.drawLine( viewPortPoint->y * scaledHeight + 1, 0, viewPortPoint->y * scaledHeight + 1, scaledWidth - 1);
                         }
                         else if(page->rotation() == Okular::Rotation180)
                         {
                             painter.drawLine( 0, (1.0 - viewPortPoint->y) * scaledHeight - 1, scaledWidth - 1, (1.0 - viewPortPoint->y) * scaledHeight - 1 );
                         }
                         else if(page->rotation() == Okular::Rotation90) // not right, rotation clock-wise
                         {
                             painter.drawLine( scaledWidth - (viewPortPoint->y * scaledHeight + 1), 0, scaledWidth - (viewPortPoint->y * scaledHeight + 1), scaledWidth - 1);
                         }
             */
         }
 
         // 4B.5. create the back pixmap converting from the local image
         backPixmap = new QPixmap(QPixmap::fromImage(backImage));
         backPixmap->setDevicePixelRatio(dpr);
 
         // 4B.6. create a painter over the pixmap and set it as the active one
         mixedPainter = new QPainter(backPixmap);
         mixedPainter->translate(-limits.left(), -limits.top());
     }
 
     /** 5 -- MIXED FLOW. Draw ANNOTATIONS [OPAQUE ONES] on ACTIVE PAINTER  **/
     if (unbufferedAnnotations) {
         // iterate over annotations and paint AText, AGeom, AStamp
         QList<Okular::Annotation *>::const_iterator aIt = unbufferedAnnotations->constBegin(), aEnd = unbufferedAnnotations->constEnd();
         for (; aIt != aEnd; ++aIt) {
             Okular::Annotation *a = *aIt;
 
             // honor opacity settings on supported types
             unsigned int opacity = (unsigned int)(a->style().color().alpha() * a->style().opacity());
             // skip the annotation drawing if all the annotation is fully
             // transparent, but not with text annotations
             if (opacity <= 0 && a->subType() != Okular::Annotation::AText) {
                 continue;
             }
 
             QColor acolor = a->style().color();
             if (!acolor.isValid()) {
                 acolor = Qt::yellow;
             }
             acolor.setAlpha(opacity);
 
             // Annotation boundary in destPainter coordinates:
             QRect annotBoundary = a->transformedBoundingRectangle().geometry(scaledWidth, scaledHeight).translated(-scaledCrop.topLeft());
             QRect annotRect = annotBoundary.intersected(limits);
             // Visible portion of the annotation at annotBoundary size:
             QRect innerRect = annotRect.translated(-annotBoundary.topLeft());
             QRectF dInnerRect(innerRect.x() * dpr, innerRect.y() * dpr, innerRect.width() * dpr, innerRect.height() * dpr);
 
             Okular::Annotation::SubType type = a->subType();
 
             // draw TextAnnotation
             if (type == Okular::Annotation::AText) {
                 Okular::TextAnnotation *text = (Okular::TextAnnotation *)a;
                 if (text->textType() == Okular::TextAnnotation::InPlace) {
                     QImage image(annotBoundary.size(), QImage::Format_ARGB32);
                     image.fill(acolor.rgba());
                     QPainter painter(&image);
                     painter.setFont(text->textFont());
                     painter.setPen(text->textColor());
                     Qt::AlignmentFlag halign = (text->inplaceAlignment() == 1 ? Qt::AlignHCenter : (text->inplaceAlignment() == 2 ? Qt::AlignRight : Qt::AlignLeft));
                     const double invXScale = (double)page->width() / scaledWidth;
                     const double invYScale = (double)page->height() / scaledHeight;
                     const double borderWidth = text->style().width();
                     painter.scale(1 / invXScale, 1 / invYScale);
                     painter.drawText(
                         borderWidth * invXScale, borderWidth * invYScale, (image.width() - 2 * borderWidth) * invXScale, (image.height() - 2 * borderWidth) * invYScale, Qt::AlignTop | halign | Qt::TextWordWrap, text->contents());
                     painter.resetTransform();
                     // Required as asking for a zero width pen results
                     // in a default width pen (1.0) being created
                     if (borderWidth != 0) {
                         QPen pen(Qt::black, borderWidth);
                         painter.setPen(pen);
                         painter.drawRect(0, 0, image.width() - 1, image.height() - 1);
                     }
                     painter.end();
 
                     mixedPainter->drawImage(annotBoundary.topLeft(), image);
                 } else if (text->textType() == Okular::TextAnnotation::Linked) {
                     // get pixmap, colorize and alpha-blend it
                     QPixmap pixmap = QIcon::fromTheme(text->textIcon().toLower()).pixmap(32);
 
                     QPixmap scaledCroppedPixmap = pixmap.scaled(TEXTANNOTATION_ICONSIZE * dpr, TEXTANNOTATION_ICONSIZE * dpr).copy(dInnerRect.toAlignedRect());
                     scaledCroppedPixmap.setDevicePixelRatio(dpr);
                     QImage scaledCroppedImage = scaledCroppedPixmap.toImage();
 
                     // if the annotation color is valid (ie it was set), then
                     // use it to colorize the icon, otherwise the icon will be
                     // "gray"
                     if (a->style().color().isValid()) {
                         GuiUtils::colorizeImage(scaledCroppedImage, a->style().color(), opacity);
                     }
                     pixmap = QPixmap::fromImage(scaledCroppedImage);
 
                     // draw the mangled image to painter
                     mixedPainter->drawPixmap(annotRect.topLeft(), pixmap);
                 }
 
             }
             // draw StampAnnotation
             else if (type == Okular::Annotation::AStamp) {
                 Okular::StampAnnotation *stamp = (Okular::StampAnnotation *)a;
 
                 // get pixmap and alpha blend it if needed
                 QPixmap pixmap = Okular::AnnotationUtils::loadStamp(stamp->stampIconName(), qMax(annotBoundary.width(), annotBoundary.height()) * dpr);
                 if (!pixmap.isNull()) // should never happen but can happen on huge sizes
                 {
                     // Draw pixmap with opacity:
                     mixedPainter->save();
                     mixedPainter->setOpacity(mixedPainter->opacity() * opacity / 255.0);
 
                     mixedPainter->drawPixmap(annotRect.topLeft(), pixmap.scaled(annotBoundary.width() * dpr, annotBoundary.height() * dpr), dInnerRect.toAlignedRect());
 
                     mixedPainter->restore();
                 }
             }
             // draw GeomAnnotation
             else if (type == Okular::Annotation::AGeom) {
                 Okular::GeomAnnotation *geom = (Okular::GeomAnnotation *)a;
                 // check whether there's anything to draw
                 if (geom->style().width() || geom->geometricalInnerColor().isValid()) {
                     mixedPainter->save();
                     const double width = geom->style().width() * Okular::Utils::realDpi(nullptr).width() / (72.0 * 2.0) * scaledWidth / page->width();
                     QRectF r(.0, .0, annotBoundary.width(), annotBoundary.height());
                     r.adjust(width, width, -width, -width);
                     r.translate(annotBoundary.topLeft());
                     if (geom->geometricalInnerColor().isValid()) {
                         r.adjust(width, width, -width, -width);
                         const QColor color = geom->geometricalInnerColor();
                         mixedPainter->setPen(Qt::NoPen);
                         mixedPainter->setBrush(QColor(color.red(), color.green(), color.blue(), opacity));
                         if (geom->geometricalType() == Okular::GeomAnnotation::InscribedSquare) {
                             mixedPainter->drawRect(r);
                         } else {
                             mixedPainter->drawEllipse(r);
                         }
                         r.adjust(-width, -width, width, width);
                     }
                     if (geom->style().width()) // need to check the original size here..
                     {
                         mixedPainter->setPen(buildPen(a, width * 2, acolor));
                         mixedPainter->setBrush(Qt::NoBrush);
                         if (geom->geometricalType() == Okular::GeomAnnotation::InscribedSquare) {
                             mixedPainter->drawRect(r);
                         } else {
                             mixedPainter->drawEllipse(r);
                         }
                     }
                     mixedPainter->restore();
                 }
             }
 
             // draw extents rectangle
             if (Okular::Settings::debugDrawAnnotationRect()) {
                 mixedPainter->setPen(a->style().color());
                 mixedPainter->drawRect(annotBoundary);
             }
         }
     }
 
     if (boundingRectOnlyAnn) {
         QRect annotBoundary = boundingRectOnlyAnn->transformedBoundingRectangle().geometry(scaledWidth, scaledHeight).translated(-scaledCrop.topLeft());
         mixedPainter->setPen(Qt::DashLine);
         mixedPainter->drawRect(annotBoundary);
     }
 
     /** 6 -- MIXED FLOW. Draw LINKS+IMAGES BORDER on ACTIVE PAINTER  **/
     if (enhanceLinks || enhanceImages) {
         mixedPainter->save();
         mixedPainter->scale(scaledWidth, scaledHeight);
         mixedPainter->translate(-crop.left, -crop.top);
 
         QColor normalColor = QApplication::palette().color(QPalette::Active, QPalette::Highlight);
         // enlarging limits for intersection is like growing the 'rectGeometry' below
         QRect limitsEnlarged = limits;
         limitsEnlarged.adjust(-2, -2, 2, 2);
         // draw rects that are inside the 'limits' paint region as opaque rects
         for (Okular::ObjectRect *rect : page->m_rects) {
             if ((enhanceLinks && rect->objectType() == Okular::ObjectRect::Action) || (enhanceImages && rect->objectType() == Okular::ObjectRect::Image)) {
                 if (limitsEnlarged.intersects(rect->boundingRect(scaledWidth, scaledHeight).translated(-scaledCrop.topLeft()))) {
                     mixedPainter->strokePath(rect->region(), QPen(normalColor, 0));
                 }
             }
         }
         mixedPainter->restore();
     }
 
     /** 7 -- BUFFERED FLOW. Copy BACKPIXMAP on DESTINATION PAINTER **/
     if (useBackBuffer) {
         delete mixedPainter;
         destPainter->drawPixmap(limits.left(), limits.top(), *backPixmap);
         delete backPixmap;
     }
 
     // delete object containers
     delete bufferedHighlights;
     delete bufferedAnnotations;
     delete unbufferedAnnotations;
 }
 
 void PagePainter::recolor(QImage *image, const QColor &foreground, const QColor &background)
 {
     if (image->format() != QImage::Format_ARGB32_Premultiplied) {
         qCWarning(OkularUiDebug) << "Wrong image format! Converting...";
         *image = image->convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
 
     Q_ASSERT(image->format() == QImage::Format_ARGB32_Premultiplied);
 
     const float scaleRed = background.redF() - foreground.redF();
     const float scaleGreen = background.greenF() - foreground.greenF();
     const float scaleBlue = background.blueF() - foreground.blueF();
 
     const int foreground_red = foreground.red();
     const int foreground_green = foreground.green();
     const int foreground_blue = foreground.blue();
 
     QRgb *data = reinterpret_cast<QRgb *>(image->bits());
     const int pixels = image->width() * image->height();
 
     for (int i = 0; i < pixels; ++i) {
         const int lightness = qGray(data[i]);
 
         const float r = scaleRed * lightness + foreground_red;
         const float g = scaleGreen * lightness + foreground_green;
         const float b = scaleBlue * lightness + foreground_blue;
 
         const unsigned a = qAlpha(data[i]);
         data[i] = qRgba(r, g, b, a);
     }
 }
 
 void PagePainter::blackWhite(QImage *image, int contrast, int threshold)
 {
     unsigned int *data = reinterpret_cast<unsigned int *>(image->bits());
     int con = contrast;
     int thr = 255 - threshold;
 
     int pixels = image->width() * image->height();
     for (int i = 0; i < pixels; ++i) {
         // Piecewise linear function of val, through (0, 0), (thr, 128), (255, 255)
         int val = qGray(data[i]);
         if (val > thr) {
             val = 128 + (127 * (val - thr)) / (255 - thr);
         } else if (val < thr) {
             val = (128 * val) / thr;
         }
 
         // Linear contrast stretching through (thr, thr)
         if (con > 2) {
             val = thr + (val - thr) * con / 2;
             val = qBound(0, val, 255);
         }
 
         const unsigned a = qAlpha(data[i]);
         data[i] = qRgba(val, val, val, a);
     }
 }
 
 void PagePainter::invertLightness(QImage *image)
 {
     if (image->format() != QImage::Format_ARGB32_Premultiplied) {
         qCWarning(OkularUiDebug) << "Wrong image format! Converting...";
         *image = image->convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
 
     Q_ASSERT(image->format() == QImage::Format_ARGB32_Premultiplied);
 
     QRgb *data = reinterpret_cast<QRgb *>(image->bits());
     int pixels = image->width() * image->height();
     for (int i = 0; i < pixels; ++i) {
         // Invert lightness of the pixel using the cylindric HSL color model.
         // Algorithm is based on https://en.wikipedia.org/wiki/HSL_and_HSV#HSL_to_RGB (2019-03-17).
         // Important simplifications are that inverting lightness does not change chroma and hue.
         // This means the sector (of the chroma/hue plane) is not changed,
         // so we can use a linear calculation after determining the sector using qMin() and qMax().
         uchar R = qRed(data[i]);
         uchar G = qGreen(data[i]);
         uchar B = qBlue(data[i]);
 
         // Get only the needed HSL components. These are chroma C and the common component m.
         // Get common component m
         uchar m = qMin(R, qMin(G, B));
         // Remove m from color components
         R -= m;
         G -= m;
         B -= m;
         // Get chroma C
         uchar C = qMax(R, qMax(G, B));
 
         // Get common component m' after inverting lightness L.
         // Hint: Lightness L = m + C / 2; L' = 255 - L = 255 - (m + C / 2) => m' = 255 - C - m
         uchar m_ = 255 - C - m;
 
         // Add m' to color compontents
         R += m_;
         G += m_;
         B += m_;
 
         // Save new color
         const unsigned A = qAlpha(data[i]);
         data[i] = qRgba(R, G, B, A);
     }
 }
 
 void PagePainter::invertLuma(QImage *image, float Y_R, float Y_G, float Y_B)
 {
     if (image->format() != QImage::Format_ARGB32_Premultiplied) {
         qCWarning(OkularUiDebug) << "Wrong image format! Converting...";
         *image = image->convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
 
     Q_ASSERT(image->format() == QImage::Format_ARGB32_Premultiplied);
 
     QRgb *data = reinterpret_cast<QRgb *>(image->bits());
     int pixels = image->width() * image->height();
     for (int i = 0; i < pixels; ++i) {
         uchar R = qRed(data[i]);
         uchar G = qGreen(data[i]);
         uchar B = qBlue(data[i]);
 
         invertLumaPixel(R, G, B, Y_R, Y_G, Y_B);
 
         // Save new color
         const unsigned A = qAlpha(data[i]);
         data[i] = qRgba(R, G, B, A);
     }
 }
 
 void PagePainter::invertLumaPixel(uchar &R, uchar &G, uchar &B, float Y_R, float Y_G, float Y_B)
 {
     // Invert luma of the pixel using the bicone HCY color model, stretched to cylindric HSY.
     // Algorithm is based on https://en.wikipedia.org/wiki/HSL_and_HSV#Luma,_chroma_and_hue_to_RGB (2019-03-19).
     // For an illustration see https://experilous.com/1/product/make-it-colorful/ (2019-03-19).
 
     // Special case: The algorithm does not work when hue is undefined.
     if (R == G && G == B) {
         R = 255 - R;
         G = 255 - G;
         B = 255 - B;
         return;
     }
 
     // Get input and output luma Y, Y_inv in range 0..255
     float Y = R * Y_R + G * Y_G + B * Y_B;
     float Y_inv = 255 - Y;
 
     // Get common component m and remove from color components.
     // This moves us to the bottom faces of the HCY bicone, i. e. we get C and X in R, G, B.
     uint_fast8_t m = qMin(R, qMin(G, B));
     R -= m;
     G -= m;
     B -= m;
 
     // We operate in a hue plane of the luma/chroma/hue bicone.
     // The hue plane is a triangle.
     // This bicone is distorted, so we can not simply mirror the triangle.
     // We need to stretch it to a luma/saturation rectangle, so we need to stretch chroma C and the proportional X.
 
     // First, we need to calculate luma Y_full_C for the outer corner of the triangle.
     // Then we can interpolate the max chroma C_max, C_inv_max for our luma Y, Y_inv.
     // Then we calculate C_inv and X_inv by scaling them by the ratio of C_max and C_inv_max.
 
     // Calculate luma Y_full_C (in range equivalent to gray 0..255) for chroma = 1 at this hue.
     // Piecewise linear, with the corners of the bicone at the sum of one or two luma coefficients.
     float Y_full_C;
     if (R >= B && B >= G) {
         Y_full_C = 255 * Y_R + 255 * Y_B * B / R;
     } else if (R >= G && G >= B) {
         Y_full_C = 255 * Y_R + 255 * Y_G * G / R;
     } else if (G >= R && R >= B) {
         Y_full_C = 255 * Y_G + 255 * Y_R * R / G;
     } else if (G >= B && B >= R) {
         Y_full_C = 255 * Y_G + 255 * Y_B * B / G;
     } else if (B >= G && G >= R) {
         Y_full_C = 255 * Y_B + 255 * Y_G * G / B;
     } else {
         Y_full_C = 255 * Y_B + 255 * Y_R * R / B;
     }
 
     // Calculate C_max, C_inv_max, to scale C and X.
     float C_max, C_inv_max;
     if (Y >= Y_full_C) {
         C_max = Y_inv / (255 - Y_full_C);
     } else {
         C_max = Y / Y_full_C;
     }
     if (Y_inv >= Y_full_C) {
         C_inv_max = Y / (255 - Y_full_C);
     } else {
         C_inv_max = Y_inv / Y_full_C;
     }
 
     // Scale C and X. C and X already lie in R, G, B.
     float C_scale = C_inv_max / C_max;
     float R_ = R * C_scale;
     float G_ = G * C_scale;
     float B_ = B * C_scale;
 
     // Calculate missing luma (in range 0..255), to get common component m_inv
     float m_inv = Y_inv - (Y_R * R_ + Y_G * G_ + Y_B * B_);
 
     // Add m_inv to color compontents
     R_ += m_inv;
     G_ += m_inv;
     B_ += m_inv;
 
     // Return colors rounded
     R = R_ + 0.5;
     G = G_ + 0.5;
     B = B_ + 0.5;
 }
 
 void PagePainter::hueShiftPositive(QImage *image)
 {
     if (image->format() != QImage::Format_ARGB32_Premultiplied) {
         qCWarning(OkularUiDebug) << "Wrong image format! Converting...";
         *image = image->convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
 
     Q_ASSERT(image->format() == QImage::Format_ARGB32_Premultiplied);
 
     QRgb *data = reinterpret_cast<QRgb *>(image->bits());
     int pixels = image->width() * image->height();
     for (int i = 0; i < pixels; ++i) {
         uchar R = qRed(data[i]);
         uchar G = qGreen(data[i]);
         uchar B = qBlue(data[i]);
 
         // Save new color
         const unsigned A = qAlpha(data[i]);
         data[i] = qRgba(B, R, G, A);
     }
 }
 
 void PagePainter::hueShiftNegative(QImage *image)
 {
     if (image->format() != QImage::Format_ARGB32_Premultiplied) {
         qCWarning(OkularUiDebug) << "Wrong image format! Converting...";
         *image = image->convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
 
     Q_ASSERT(image->format() == QImage::Format_ARGB32_Premultiplied);
 
     QRgb *data = reinterpret_cast<QRgb *>(image->bits());
     int pixels = image->width() * image->height();
     for (int i = 0; i < pixels; ++i) {
         uchar R = qRed(data[i]);
         uchar G = qGreen(data[i]);
         uchar B = qBlue(data[i]);
 
         // Save new color
         const unsigned A = qAlpha(data[i]);
         data[i] = qRgba(G, B, R, A);
     }
 }
 
 void PagePainter::drawShapeOnImage(QImage &image, const NormalizedPath &normPath, bool closeShape, const QPen &pen, const QBrush &brush, double penWidthMultiplier, RasterOperation op
                                    // float antiAliasRadius
 )
 {
     // safety checks
     int pointsNumber = normPath.size();
     if (pointsNumber < 2) {
         return;
     }
 
     const double dpr = image.devicePixelRatio();
     const double fImageWidth = image.width() / dpr;
     const double fImageHeight = image.height() / dpr;
 
     // stroke outline
     double penWidth = (double)pen.width() * penWidthMultiplier;
     QPainter painter(&image);
     painter.setRenderHint(QPainter::Antialiasing);
     QPen pen2 = pen;
     pen2.setWidthF(penWidth);
     painter.setPen(pen2);
     painter.setBrush(brush);
 
     if (op == Multiply) {
         painter.setCompositionMode(QPainter::CompositionMode_Multiply);
     }
 
     if (brush.style() == Qt::NoBrush) {
         // create a polygon
         QPolygonF poly(closeShape ? pointsNumber + 1 : pointsNumber);
         for (int i = 0; i < pointsNumber; ++i) {
             poly[i] = QPointF(normPath[i].x * fImageWidth, normPath[i].y * fImageHeight);
         }
         if (closeShape) {
             poly[pointsNumber] = poly[0];
         }
 
         painter.drawPolyline(poly);
     } else {
         // create a 'path'
         QPainterPath path;
         path.setFillRule(Qt::WindingFill);
 
         path.moveTo(normPath[0].x * fImageWidth, normPath[0].y * fImageHeight);
         for (int i = 1; i < pointsNumber; i++) {
             path.lineTo(normPath[i].x * fImageWidth, normPath[i].y * fImageHeight);
         }
         if (closeShape) {
             path.closeSubpath();
         }
 
         painter.drawPath(path);
     }
 }
 
 void PagePainter::drawEllipseOnImage(QImage &image, const NormalizedPath &rect, const QPen &pen, const QBrush &brush, double penWidthMultiplier, RasterOperation op)
 {
     const double dpr = image.devicePixelRatio();
     const double fImageWidth = image.width() / dpr;
     const double fImageHeight = image.height() / dpr;
 
     // stroke outline
     const double penWidth = (double)pen.width() * penWidthMultiplier;
     QPainter painter(&image);
     painter.setRenderHint(QPainter::Antialiasing);
     QPen pen2 = pen;
     pen2.setWidthF(penWidth);
     painter.setPen(pen2);
     painter.setBrush(brush);
 
     if (op == Multiply) {
         painter.setCompositionMode(QPainter::CompositionMode_Multiply);
     }
 
     const QPointF &topLeft {rect[0].x * fImageWidth, rect[0].y * fImageHeight};
     const QSizeF &size {(rect[1].x - rect[0].x) * fImageWidth, (rect[1].y - rect[0].y) * fImageHeight};
     const QRectF imgRect {topLeft, size};
     if (brush.style() == Qt::NoBrush) {
         painter.drawArc(imgRect, 0, 16 * 360);
     } else {
         painter.drawEllipse(imgRect);
     }
 }
 
 LineAnnotPainter::LineAnnotPainter(const Okular::LineAnnotation *a, QSizeF pageSize, double pageScale, const QTransform &toNormalizedImage)
     : la {a}
     , pageSize {pageSize}
     , pageScale {pageScale}
     , toNormalizedImage {toNormalizedImage}
     , aspectRatio {pageSize.height() / pageSize.width()}
     , linePen {buildPen(a, a->style().width(), a->style().color())}
 {
     if ((la->lineClosed() || la->transformedLinePoints().count() == 2) && la->lineInnerColor().isValid()) {
         fillBrush = QBrush(la->lineInnerColor());
     }
 }
 
 void LineAnnotPainter::draw(QImage &image) const
 {
     const QList<Okular::NormalizedPoint> transformedLinePoints = la->transformedLinePoints();
     if (transformedLinePoints.count() == 2) {
         const Okular::NormalizedPoint delta {transformedLinePoints.last().x - transformedLinePoints.first().x, transformedLinePoints.first().y - transformedLinePoints.last().y};
         const double angle {atan2(delta.y * aspectRatio, delta.x)};
         const double cosA {cos(-angle)};
         const double sinA {sin(-angle)};
         const QTransform tmpMatrix = QTransform {cosA, sinA / aspectRatio, -sinA, cosA / aspectRatio, transformedLinePoints.first().x, transformedLinePoints.first().y};
         const double deaspectedY {delta.y * aspectRatio};
         const double mainSegmentLength {sqrt(delta.x * delta.x + deaspectedY * deaspectedY)};
         const double lineendSize {std::min(6. * la->style().width() / pageSize.width(), mainSegmentLength / 2.)};
 
         drawShortenedLine(mainSegmentLength, lineendSize, image, tmpMatrix);
         drawLineEnds(mainSegmentLength, lineendSize, image, tmpMatrix);
         drawLeaderLine(0., image, tmpMatrix);
         drawLeaderLine(mainSegmentLength, image, tmpMatrix);
     } else if (transformedLinePoints.count() > 2) {
         drawMainLine(image);
     }
 }
 
 void LineAnnotPainter::drawMainLine(QImage &image) const
 {
     // draw the line as normalized path into image
     PagePainter::drawShapeOnImage(image, transformPath(la->transformedLinePoints(), toNormalizedImage), la->lineClosed(), linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawShortenedLine(double mainSegmentLength, double size, QImage &image, const QTransform &toNormalizedPage) const
 {
     const QTransform combinedTransform {toNormalizedPage * toNormalizedImage};
     const QList<Okular::NormalizedPoint> path {{shortenForArrow(size, la->lineStartStyle()), 0}, {mainSegmentLength - shortenForArrow(size, la->lineEndStyle()), 0}};
     PagePainter::drawShapeOnImage(image, transformPath(path, combinedTransform), la->lineClosed(), linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawLineEnds(double mainSegmentLength, double size, QImage &image, const QTransform &transform) const
 {
     switch (la->lineStartStyle()) {
     case Okular::LineAnnotation::Square:
         drawLineEndSquare(0, -size, transform, image);
         break;
     case Okular::LineAnnotation::Circle:
         drawLineEndCircle(0, -size, transform, image);
         break;
     case Okular::LineAnnotation::Diamond:
         drawLineEndDiamond(0, -size, transform, image);
         break;
     case Okular::LineAnnotation::OpenArrow:
         drawLineEndArrow(0, -size, 1., false, transform, image);
         break;
     case Okular::LineAnnotation::ClosedArrow:
         drawLineEndArrow(0, -size, 1., true, transform, image);
         break;
     case Okular::LineAnnotation::None:
         break;
     case Okular::LineAnnotation::Butt:
         drawLineEndButt(0, size, transform, image);
         break;
     case Okular::LineAnnotation::ROpenArrow:
         drawLineEndArrow(0, size, 1., false, transform, image);
         break;
     case Okular::LineAnnotation::RClosedArrow:
         drawLineEndArrow(0, size, 1., true, transform, image);
         break;
     case Okular::LineAnnotation::Slash:
         drawLineEndSlash(0, -size, transform, image);
         break;
     }
     switch (la->lineEndStyle()) {
     case Okular::LineAnnotation::Square:
         drawLineEndSquare(mainSegmentLength, size, transform, image);
         break;
     case Okular::LineAnnotation::Circle:
         drawLineEndCircle(mainSegmentLength, size, transform, image);
         break;
     case Okular::LineAnnotation::Diamond:
         drawLineEndDiamond(mainSegmentLength, size, transform, image);
         break;
     case Okular::LineAnnotation::OpenArrow:
         drawLineEndArrow(mainSegmentLength, size, 1., false, transform, image);
         break;
     case Okular::LineAnnotation::ClosedArrow:
         drawLineEndArrow(mainSegmentLength, size, 1., true, transform, image);
         break;
     case Okular::LineAnnotation::None:
         break;
     case Okular::LineAnnotation::Butt:
         drawLineEndButt(mainSegmentLength, size, transform, image);
         break;
     case Okular::LineAnnotation::ROpenArrow:
         drawLineEndArrow(mainSegmentLength, size, -1., false, transform, image);
         break;
     case Okular::LineAnnotation::RClosedArrow:
         drawLineEndArrow(mainSegmentLength, size, -1., true, transform, image);
         break;
     case Okular::LineAnnotation::Slash:
         drawLineEndSlash(mainSegmentLength, size, transform, image);
         break;
     }
 }
 
 void LineAnnotPainter::drawLineEndArrow(double xEndPos, double size, double flipX, bool close, const QTransform &toNormalizedPage, QImage &image) const
 {
     const QTransform combinedTransform {toNormalizedPage * toNormalizedImage};
     const QList<Okular::NormalizedPoint> path {
         {xEndPos - size * flipX, size / 2.},
         {xEndPos, 0},
         {xEndPos - size * flipX, -size / 2.},
     };
     PagePainter::drawShapeOnImage(image, transformPath(path, combinedTransform), close, linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawLineEndButt(double xEndPos, double size, const QTransform &toNormalizedPage, QImage &image) const
 {
     const QTransform combinedTransform {toNormalizedPage * toNormalizedImage};
     const double halfSize {size / 2.};
     const QList<Okular::NormalizedPoint> path {
         {xEndPos, halfSize},
         {xEndPos, -halfSize},
     };
     PagePainter::drawShapeOnImage(image, transformPath(path, combinedTransform), true, linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawLineEndCircle(double xEndPos, double size, const QTransform &toNormalizedPage, QImage &image) const
 {
     /* transform the circle midpoint to intermediate normalized coordinates
      * where it's easy to construct the bounding rect of the circle */
     Okular::NormalizedPoint center;
     toNormalizedPage.map(xEndPos - size / 2., 0, &center.x, &center.y);
     const double halfSize {size / 2.};
     const QList<Okular::NormalizedPoint> path {
         {center.x - halfSize, center.y - halfSize / aspectRatio},
         {center.x + halfSize, center.y + halfSize / aspectRatio},
     };
 
     /* then transform bounding rect with toNormalizedImage */
     PagePainter::drawEllipseOnImage(image, transformPath(path, toNormalizedImage), linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawLineEndSquare(double xEndPos, double size, const QTransform &toNormalizedPage, QImage &image) const
 {
     const QTransform combinedTransform {toNormalizedPage * toNormalizedImage};
     const QList<Okular::NormalizedPoint> path {{xEndPos, size / 2.}, {xEndPos - size, size / 2.}, {xEndPos - size, -size / 2.}, {xEndPos, -size / 2.}};
     PagePainter::drawShapeOnImage(image, transformPath(path, combinedTransform), true, linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawLineEndDiamond(double xEndPos, double size, const QTransform &toNormalizedPage, QImage &image) const
 {
     const QTransform combinedTransform {toNormalizedPage * toNormalizedImage};
     const QList<Okular::NormalizedPoint> path {{xEndPos, 0}, {xEndPos - size / 2., size / 2.}, {xEndPos - size, 0}, {xEndPos - size / 2., -size / 2.}};
     PagePainter::drawShapeOnImage(image, transformPath(path, combinedTransform), true, linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawLineEndSlash(double xEndPos, double size, const QTransform &toNormalizedPage, QImage &image) const
 {
     const QTransform combinedTransform {toNormalizedPage * toNormalizedImage};
     const double halfSize {size / 2.};
     const double xOffset {cos(M_PI / 3.) * halfSize};
     const QList<Okular::NormalizedPoint> path {
         {xEndPos - xOffset, halfSize},
         {xEndPos + xOffset, -halfSize},
     };
     PagePainter::drawShapeOnImage(image, transformPath(path, combinedTransform), true, linePen, fillBrush, pageScale);
 }
 
 void LineAnnotPainter::drawLeaderLine(double xEndPos, QImage &image, const QTransform &toNormalizedPage) const
 {
     const QTransform combinedTransform = toNormalizedPage * toNormalizedImage;
     const double ll = aspectRatio * la->lineLeadingForwardPoint() / pageSize.height();
     const double lle = aspectRatio * la->lineLeadingBackwardPoint() / pageSize.height();
     const int sign {ll > 0 ? -1 : 1};
     QList<Okular::NormalizedPoint> path;
 
     if (fabs(ll) > 0) {
         path.append({xEndPos, ll});
         // do we have the extension on the "back"?
         if (fabs(lle) > 0) {
             path.append({xEndPos, sign * lle});
         } else {
             path.append({xEndPos, 0});
         }
     }
     PagePainter::drawShapeOnImage(image, transformPath(path, combinedTransform), false, linePen, fillBrush, pageScale);
 }
 
 double LineAnnotPainter::shortenForArrow(double size, Okular::LineAnnotation::TermStyle endStyle)
 {
     double shortenBy {0};
 
     if (endStyle == Okular::LineAnnotation::Square || endStyle == Okular::LineAnnotation::Circle || endStyle == Okular::LineAnnotation::Diamond || endStyle == Okular::LineAnnotation::ClosedArrow) {
         shortenBy = size;
     }
 
     return shortenBy;
 }
 
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