drawing-pattern.h

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// SPDX-License-Identifier: GPL-2.0-or-later
 * Authors:
 *   Tomasz Boczkowski <penginsbacon@gmail.com>
 *
 * Copyright (C) 2014 Authors
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#ifndef INKSCAPE_DISPLAY_DRAWING_PATTERN_H
#define INKSCAPE_DISPLAY_DRAWING_PATTERN_H
 
#include <mutex>
#include <cairomm/surface.h>
#include "drawing-group.h"
 
using cairo_pattern_t = struct _cairo_pattern;
 
namespace Inkscape {
 
class DrawingPattern
    : public DrawingGroup
{
public:
    DrawingPattern(Drawing &drawing);
    int tag() const override { return tag_of<decltype(*this)>; }
 
    void setPatternToUserTransform(Geom::Affine const &);
 
    void setTileRect(Geom::Rect const &);
 
    void setOverflow(Geom::Affine const &initial_transform, int steps, Geom::Affine const &step_transform);
 
    cairo_pattern_t *renderPattern(RenderContext &rc, Geom::IntRect const &area, float opacity, int device_scale) const;
 
protected:
    ~DrawingPattern() override = default;
 
    unsigned _updateItem(Geom::IntRect const &area, UpdateContext const &ctx, unsigned flags, unsigned reset) override;
 
    void _dropPatternCache() override;
 
    std::unique_ptr<Geom::Affine> _pattern_to_user;
 
    // Set by overflow.
    Geom::Affine _overflow_initial_transform;
    Geom::Affine _overflow_step_transform;
    int _overflow_steps;
 
    Geom::OptRect _tile_rect;
 
    // Set on update.
    Geom::IntPoint _pattern_resolution;
 
    struct Surface
    {
        Surface(Geom::IntRect const &rect, int device_scale);
        Geom::IntRect rect;
        Cairo::RefPtr<Cairo::ImageSurface> surface;
    };
 
    mutable std::mutex mutables;
 
    // Parts of the pattern tile that have been rendered. Read/written on render, cleared on update.
    mutable std::vector<Surface> surfaces;
};
 
} // namespace Inkscape
 
#endif // INKSCAPE_DISPLAY_DRAWING_PATTERN_H
 
/*
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  End:
*/
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