File indexing completed on 2024-05-12 15:56:39

 /* This file is part of the KDE project
  * SPDX-FileCopyrightText: 2011 Jan Hambrecht <jaham@gmx.net>
  *
  * SPDX-License-Identifier: LGPL-2.0-or-later
  */
 
 #include "KoClipPath.h"
 #include "KoPathShape.h"
 #include "KoShapeGroup.h"
 
 #include <QTransform>
 #include <QPainterPath>
 #include <QPainter>
 #include <QVarLengthArray>
 #include <QSharedData>
 
 #include <kis_algebra_2d.h>
 
 
 QTransform scaleToPercent(const QSizeF &size)
 {
     const qreal w = qMax(static_cast<qreal>(1e-5), size.width());
     const qreal h = qMax(static_cast<qreal>(1e-5), size.height());
     return QTransform().scale(1.0/w, 1.0/h);
 }
 
 QTransform scaleFromPercent(const QSizeF &size)
 {
     const qreal w = qMax(static_cast<qreal>(1e-5), size.width());
     const qreal h = qMax(static_cast<qreal>(1e-5), size.height());
     return QTransform().scale(w/1.0, h/1.0);
 }
 
 class Q_DECL_HIDDEN KoClipPath::Private : public QSharedData
 {
 public:
     Private()
         : QSharedData()
     {}
 
     Private(const Private &rhs)
         : QSharedData()
         , clipPath(rhs.clipPath)
         , clipRule(rhs.clipRule)
         , coordinates(rhs.coordinates)
         , initialTransformToShape(rhs.initialTransformToShape)
         , initialShapeSize(rhs.initialShapeSize)
     {
         Q_FOREACH (KoShape *shape, rhs.shapes) {
             KoShape *clonedShape = shape->cloneShape();
             KIS_ASSERT_RECOVER(clonedShape) { continue; }
 
             shapes.append(clonedShape);
         }
     }
 
     ~Private()
     {
         qDeleteAll(shapes);
         shapes.clear();
     }
 
     void collectShapePath(QPainterPath *result, const KoShape *shape) {
         if (const KoPathShape *pathShape = dynamic_cast<const KoPathShape*>(shape)) {
             // different shapes add up to the final path using Windind Fill rule (acc. to SVG 1.1)
             QTransform t = pathShape->absoluteTransformation();
             result->addPath(t.map(pathShape->outline()));
         } else if (const KoShapeGroup *groupShape = dynamic_cast<const KoShapeGroup*>(shape)) {
             QList<KoShape*> shapes = groupShape->shapes();
             std::sort(shapes.begin(), shapes.end(), KoShape::compareShapeZIndex);
 
             Q_FOREACH (const KoShape *child, shapes) {
                 collectShapePath(result, child);
             }
         }
     }
 
 
     void compileClipPath()
     {
         QList<KoShape*> clipShapes = this->shapes;
         if (clipShapes.isEmpty())
             return;
 
         clipPath = QPainterPath();
         clipPath.setFillRule(Qt::WindingFill);
 
         std::sort(clipShapes.begin(), clipShapes.end(), KoShape::compareShapeZIndex);
 
         Q_FOREACH (KoShape *path, clipShapes) {
             if (!path) continue;
 
             collectShapePath(&clipPath, path);
         }
     }
 
     QList<KoShape*> shapes;
     QPainterPath clipPath; ///< the compiled clip path in shape coordinates of the clipped shape
     Qt::FillRule clipRule = Qt::WindingFill;
     KoFlake::CoordinateSystem coordinates = KoFlake::ObjectBoundingBox;
     QTransform initialTransformToShape; ///< initial transformation to shape coordinates of the clipped shape
     QSizeF initialShapeSize; ///< initial size of clipped shape
 };
 
 KoClipPath::KoClipPath(QList<KoShape*> clipShapes, KoFlake::CoordinateSystem coordinates)
    : d(new Private())
 {
     d->shapes = clipShapes;
     d->coordinates = coordinates;
     d->compileClipPath();
 }
 
 KoClipPath::~KoClipPath()
 {
 }
 
 KoClipPath::KoClipPath(const KoClipPath &rhs)
     : d(new Private(*rhs.d))
 {
 }
 
 KoClipPath &KoClipPath::operator=(const KoClipPath &rhs)
 {
     d = rhs.d;
     return *this;
 }
 
 KoClipPath *KoClipPath::clone() const
 {
     return new KoClipPath(*this);
 }
 
 void KoClipPath::setClipRule(Qt::FillRule clipRule)
 {
     d->clipRule = clipRule;
 }
 
 Qt::FillRule KoClipPath::clipRule() const
 {
     return d->clipRule;
 }
 
 KoFlake::CoordinateSystem KoClipPath::coordinates() const
 {
     return d->coordinates;
 }
 
 void KoClipPath::applyClipping(KoShape *shape, QPainter &painter)
 {
     if (shape->clipPath()) {
         QPainterPath path = shape->clipPath()->path();
 
         if (shape->clipPath()->coordinates() == KoFlake::ObjectBoundingBox) {
             const QRectF shapeLocalBoundingRect = shape->outline().boundingRect();
             path = KisAlgebra2D::mapToRect(shapeLocalBoundingRect).map(path);
         }
 
         if (!path.isEmpty()) {
             painter.setClipPath(path, Qt::IntersectClip);
         }
     }
 }
 
 QPainterPath KoClipPath::path() const
 {
     return d->clipPath;
 }
 
 QPainterPath KoClipPath::pathForSize(const QSizeF &size) const
 {
     return scaleFromPercent(size).map(d->clipPath);
 }
 
 QList<KoPathShape*> KoClipPath::clipPathShapes() const
 {
     // TODO: deprecate this method!
 
     QList<KoPathShape*> shapes;
 
     Q_FOREACH (KoShape *shape, d->shapes) {
         KoPathShape *pathShape = dynamic_cast<KoPathShape*>(shape);
         if (pathShape) {
             shapes << pathShape;
         }
     }
 
     return shapes;
 }
 
 QList<KoShape *> KoClipPath::clipShapes() const
 {
     return d->shapes;
 }
 
 QTransform KoClipPath::clipDataTransformation(KoShape *clippedShape) const
 {
     if (!clippedShape)
         return d->initialTransformToShape;
 
     // the current transformation of the clipped shape
     QTransform currentShapeTransform = clippedShape->absoluteTransformation();
 
     // calculate the transformation which represents any resizing of the clipped shape
     const QSizeF currentShapeSize = clippedShape->outline().boundingRect().size();
     const qreal sx = currentShapeSize.width() / d->initialShapeSize.width();
     const qreal sy = currentShapeSize.height() / d->initialShapeSize.height();
     QTransform scaleTransform = QTransform().scale(sx, sy);
 
     // 1. transform to initial clipped shape coordinates
     // 2. apply resizing transformation
     // 3. convert to current clipped shape document coordinates
     return d->initialTransformToShape * scaleTransform * currentShapeTransform;
 }