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-rw-r--r--src/display/drawing-pattern.h87
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diff --git a/src/display/drawing-pattern.h b/src/display/drawing-pattern.h
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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 SEEN_INKSCAPE_DISPLAY_DRAWING_PATTERN_H
+#define SEEN_INKSCAPE_DISPLAY_DRAWING_PATTERN_H
+
+#include "display/drawing-group.h"
+
+typedef struct _cairo_pattern cairo_pattern_t;
+
+namespace Inkscape {
+
+/**
+ * @brief Drawing tree node used for rendering paints.
+ *
+ * DrawingPattern is used for rendering patterns and hatches.
+ *
+ * It renders it's 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, bool debug = false);
+ ~DrawingPattern() override;
+
+ /**
+ * Set the transformation from pattern to user coordinate systems.
+ * @see SPPattern description for explanation of coordinate systems.
+ */
+ void setPatternToUserTransform(Geom::Affine const &new_trans);
+ /**
+ * Set the tile rect position and dimensions in content coordinate system
+ */
+ void setTileRect(Geom::Rect const &tile_rect);
+ /**
+ * 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 initial_transform, int steps, Geom::Affine step_transform);
+ /**
+ * Render the pattern.
+ *
+ * Returns caito_pattern_t structure that can be set as source surface.
+ */
+ cairo_pattern_t *renderPattern(float opacity);
+protected:
+ unsigned _updateItem(Geom::IntRect const &area, UpdateContext const &ctx,
+ unsigned flags, unsigned reset) override;
+
+ Geom::Affine *_pattern_to_user;
+ Geom::Affine _overflow_initial_transform;
+ Geom::Affine _overflow_step_transform;
+ int _overflow_steps;
+ Geom::OptRect _tile_rect;
+ bool _debug;
+ Geom::IntPoint _pattern_resolution;
+};
+
+bool is_drawing_group(DrawingItem *item);
+
+} // end namespace Inkscape
+
+#endif // !SEEN_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 :