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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:24:48 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:24:48 +0000
commitcca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch)
tree146f39ded1c938019e1ed42d30923c2ac9e86789 /src/object/sp-paint-server.h
parentInitial commit. (diff)
downloadinkscape-upstream.tar.xz
inkscape-upstream.zip
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/object/sp-paint-server.h')
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1 files changed, 104 insertions, 0 deletions
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SP_PAINT_SERVER_H
+#define SEEN_SP_PAINT_SERVER_H
+
+/*
+ * Base class for gradients and patterns
+ *
+ * Author:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ * Copyright (C) 2010 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cairo.h>
+#include <2geom/rect.h>
+#include <sigc++/slot.h>
+#include "sp-object.h"
+
+namespace Inkscape {
+
+class Drawing;
+class DrawingPattern;
+
+}
+
+class SPPaintServer : public SPObject {
+public:
+ SPPaintServer();
+ ~SPPaintServer() override;
+
+ bool isSwatch() const;
+ virtual bool isValid() const;
+
+ //There are two ways to render a paint. The simple one is to create cairo_pattern_t structure
+ //on demand by pattern_new method. It is used for gradients. The other one is to add elements
+ //representing PaintServer in NR tree. It is used by hatches and patterns.
+ //Either pattern new or all three methods show, hide, setBBox need to be implemented
+ virtual Inkscape::DrawingPattern *show(Inkscape::Drawing &drawing, unsigned int key, Geom::OptRect bbox); // TODO check passing bbox by value. Looks suspicious.
+ virtual void hide(unsigned int key);
+ virtual void setBBox(unsigned int key, Geom::OptRect const &bbox);
+
+ virtual cairo_pattern_t* pattern_new(cairo_t *ct, Geom::OptRect const &bbox, double opacity);
+
+protected:
+ bool swatch;
+};
+
+/**
+ * Returns the first of {src, src-\>ref-\>getObject(),
+ * src-\>ref-\>getObject()-\>ref-\>getObject(),...}
+ * for which \a match is true, or NULL if none found.
+ *
+ * The raison d'ĂȘtre of this routine is that it correctly handles cycles in the href chain (e.g., if
+ * a gradient gives itself as its href, or if each of two gradients gives the other as its href).
+ *
+ * \pre SP_IS_GRADIENT(src).
+ */
+template <class PaintServer>
+PaintServer *chase_hrefs(PaintServer *src, sigc::slot<bool, PaintServer const *> match) {
+ /* Use a pair of pointers for detecting loops: p1 advances half as fast as p2. If there is a
+ loop, then once p1 has entered the loop, we'll detect it the next time the distance between
+ p1 and p2 is a multiple of the loop size. */
+ PaintServer *p1 = src, *p2 = src;
+ bool do1 = false;
+ for (;;) {
+ if (match(p2)) {
+ return p2;
+ }
+
+ p2 = p2->ref->getObject();
+ if (!p2) {
+ return p2;
+ }
+ if (do1) {
+ p1 = p1->ref->getObject();
+ }
+ do1 = !do1;
+
+ if ( p2 == p1 ) {
+ /* We've been here before, so return NULL to indicate that no matching gradient found
+ * in the chain. */
+ return nullptr;
+ }
+ }
+}
+
+MAKE_SP_OBJECT_TYPECHECK_FUNCTIONS(SP_IS_PAINT_SERVER, SPPaintServer)
+
+#endif // SEEN_SP_PAINT_SERVER_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 :