Adding upstream version 1.3+ds.upstream/1.3+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/src/display/control/canvas-item-context.h b/src/display/control/canvas-item-context.h
new file mode 100644
index 0000000..117110a
--- /dev/null
+++ b/src/display/control/canvas-item-context.h
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * The context in which a single CanvasItem tree exists. Holds the root node and common state.
+ */
+#ifndef SEEN_CANVAS_ITEM_CONTEXT_H
+#define SEEN_CANVAS_ITEM_CONTEXT_H
+
+#include <2geom/affine.h>
+#include "util/funclog.h"
+
+namespace Inkscape {
+
+namespace UI::Widget { class Canvas; }
+class CanvasItemGroup;
+
+class CanvasItemContext
+{
+public:
+    CanvasItemContext(UI::Widget::Canvas *canvas);
+    CanvasItemContext(CanvasItemContext const &) = delete;
+    CanvasItemContext &operator=(CanvasItemContext const &) = delete;
+    ~CanvasItemContext();
+
+    // Structure
+    UI::Widget::Canvas *canvas() const { return _canvas; }
+    CanvasItemGroup *root() const { return _root; }
+
+    // Geometry
+    Geom::Affine const &affine() const { return _affine; }
+    void setAffine(Geom::Affine const &affine) { _affine = affine; }
+
+    // Snapshotting
+    void snapshot();
+    void unsnapshot();
+    bool snapshotted() const { return _snapshotted; }
+
+    template<typename F>
+    void defer(F &&f) { _snapshotted ? _funclog.emplace(std::forward<F>(f)) : f(); }
+
+private:
+    // Structure
+    UI::Widget::Canvas *_canvas;
+    CanvasItemGroup *_root;
+
+    // Geometry
+    Geom::Affine _affine;
+
+    // Snapshotting
+    char _cacheline_separator[127];
+
+    bool _snapshotted = false;
+    Util::FuncLog _funclog;
+};
+
+} // namespace Inkscape
+
+#endif // SEEN_CANVAS_ITEM_CONTEXT_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 :