1 files changed, 87 insertions, 0 deletions
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 :