kis_outline_generator.h

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/*
 *  SPDX-FileCopyrightText: 2004 Boudewijn Rempt <boud@valdyas.org>
 *  SPDX-FileCopyrightText: 2007, 2010 Sven Langkamp <sven.langkamp@gmail.com>
 *
 *  Outline algorithm based of the limn of fontutils
 *  SPDX-FileCopyrightText: 1992 Karl Berry <karl@cs.umb.edu>
 *  SPDX-FileCopyrightText: 1992 Kathryn Hargreaves <letters@cs.umb.edu>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef KIS_OUTLINE_GENERATOR_H
#define KIS_OUTLINE_GENERATOR_H
 
#include <QPolygon>
 
#include "kritaimage_export.h"
#include "kis_types.h"
#include <kis_random_accessor_ng.h>
class KoColorSpace;
 
 
class KRITAIMAGE_EXPORT KisOutlineGenerator
{
public:
 
    KisOutlineGenerator(const KoColorSpace* cs, quint8 defaultOpacity);
 
    QVector<QPolygon> outline(quint8* buffer, qint32 xOffset, qint32 yOffset, qint32 width, qint32 height);
 
    QVector<QPolygon> outline(const KisPaintDevice *buffer, qint32 xOffset, qint32 yOffset, qint32 width, qint32 height);
 
 
    void setSimpleOutline(bool simple);
 
private:
 
 
private:
 
    enum EdgeType {
        TopEdge = 1, LeftEdge = 2, BottomEdge = 3, RightEdge = 0, NoEdge = 4
    };
 
    template <class StorageStrategy>
    QVector<QPolygon> outlineImpl(typename StorageStrategy::StorageType buffer,
                                  qint32 xOffset, qint32 yOffset,
                                  qint32 width, qint32 height);
 
    template <class StorageStrategy>
    bool isOutlineEdge(StorageStrategy &storage, EdgeType edge, qint32 x, qint32 y, qint32 bufWidth, qint32 bufHeight);
 
    template <class StorageStrategy>
    void nextOutlineEdge(StorageStrategy &storage, EdgeType *edge, qint32 *row, qint32 *col, qint32 width, qint32 height);
 
    EdgeType nextEdge(EdgeType edge) {
        return edge == NoEdge ? edge : static_cast<EdgeType>((edge + 1) % 4);
    }
 
    void appendCoordinate(QPolygon * path, int x, int y, EdgeType edge, EdgeType prevEdge);
 
private:
 
    const KoColorSpace* m_cs;
    quint8 m_defaultOpacity;
    bool m_simple;
 
    KisRandomConstAccessorSP m_accessor;
};
 
#endif // KIS_OUTLINE_GENERATOR_H