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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* @file
* Canvas belonging to SVG pattern.
*//*
* 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 {
/**
* @brief Drawing tree node used for rendering paints.
*
* DrawingPattern is used for rendering patterns and hatches.
*
* It renders its children to a cairo_pattern_t structure that can be
* applied as source for fill or stroke operations.
*/
class DrawingPattern
: public DrawingGroup
{
public:
DrawingPattern(Drawing &drawing);
int tag() const override { return tag_of<decltype(*this)>; }
/**
* Set the transformation from pattern to user coordinate systems.
* @see SPPattern description for explanation of coordinate systems.
*/
void setPatternToUserTransform(Geom::Affine const &);
/**
* Set the tile rect position and dimensions in content coordinate system
*/
void setTileRect(Geom::Rect const &);
/**
* Turn on overflow rendering.
*
* Overflow is implemented as repeated rendering of pattern contents. In every step
* a translation transform is applied.
*/
void setOverflow(Geom::Affine const &initial_transform, int steps, Geom::Affine const &step_transform);
/**
* Render the pattern.
*
* Returns cairo_pattern_t structure that can be set as source surface.
*/
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
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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