1 files changed, 111 insertions, 0 deletions
diff --git a/src/display/sp-canvas-util.cpp b/src/display/sp-canvas-util.cpp
new file mode 100644
index 0000000..dee7d8d
--- /dev/null
+++ b/src/display/sp-canvas-util.cpp
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Helper stuff for SPCanvas
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 1999-2002 authors
+ * Copyright (C) 2001-2002 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+
+#include <2geom/affine.h>
+#include "sp-canvas-util.h"
+#include "sp-canvas-item.h"
+#include "sp-canvas.h"
+
+void sp_canvas_update_bbox(SPCanvasItem *item, int x1, int y1, int x2, int y2)
+{
+    item->canvas->requestRedraw((int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
+    item->x1 = x1;
+    item->y1 = y1;
+    item->x2 = x2;
+    item->y2 = y2;
+    item->canvas->requestRedraw((int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
+}
+
+void
+sp_canvas_item_reset_bounds (SPCanvasItem *item)
+{
+    item->x1 = 0.0;
+    item->y1 = 0.0;
+    item->x2 = 0.0;
+    item->y2 = 0.0;
+}
+
+void sp_canvas_prepare_buffer(SPCanvasBuf *)
+{
+}
+
+Geom::Affine sp_canvas_item_i2p_affine (SPCanvasItem * item)
+{
+    g_assert (item != nullptr); /* this may be overly zealous - it is
+                              * plausible that this gets called
+                              * with item == 0. */
+
+    return item->xform;
+}
+
+Geom::Affine  sp_canvas_item_i2i_affine (SPCanvasItem * from, SPCanvasItem * to)
+{
+    g_assert (from != nullptr);
+    g_assert (to != nullptr);
+
+    return sp_canvas_item_i2w_affine(from) * sp_canvas_item_i2w_affine(to).inverse();
+}
+
+void sp_canvas_item_set_i2w_affine (SPCanvasItem * item,  Geom::Affine const &i2w)
+{
+    g_assert (item != nullptr);
+
+    sp_canvas_item_affine_absolute(item, i2w * sp_canvas_item_i2w_affine(item->parent).inverse());
+}
+
+void sp_canvas_item_move_to_z (SPCanvasItem * item, gint z)
+{
+    g_assert (item != nullptr);
+    
+    if (z == 0)
+        return sp_canvas_item_lower_to_bottom(item);
+
+    gint current_z = sp_canvas_item_order (item);
+
+    if (current_z == -1) // not found in its parent
+        return;
+
+    if (z == current_z)
+        return;
+
+    if (z > current_z) {
+        sp_canvas_item_raise (item, z - current_z);
+    } else {
+        sp_canvas_item_lower (item, current_z - z);
+    }
+}
+
+gint
+sp_canvas_item_compare_z (SPCanvasItem * a, SPCanvasItem * b)
+{
+    gint const o_a = sp_canvas_item_order (a);
+    gint const o_b = sp_canvas_item_order (b);
+
+    if (o_a > o_b) return -1;
+    if (o_a < o_b) return 1;
+
+    return 0;
+}
+
+/*
+  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 :