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

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

1 files changed, 37 insertions, 0 deletions

diff --git a/src/display/dither-lock.h b/src/display/dither-lock.h
new file mode 100644
index 0000000..975b91f
--- /dev/null
+++ b/src/display/dither-lock.h
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_DISPLAY_DITHER_LOCK_H
+#define INKSCAPE_DISPLAY_DITHER_LOCK_H
+
+#include "drawing-context.h"
+#include "cairo-utils.h"
+
+namespace Inkscape {
+
+/// RAII object for temporarily turning dithering on.
+class DitherLock
+{
+public:
+    DitherLock(DrawingContext &dc, bool on)
+        : _cr(dc.rawTarget())
+        , _on(on)
+    {
+        if (_on) {
+            ink_cairo_set_dither(_cr, true);
+        }
+    }
+
+    ~DitherLock()
+    {
+        if (_on) {
+            ink_cairo_set_dither(_cr, false);
+        }
+    }
+
+private:
+    cairo_surface_t *_cr;
+    bool _on;
+};
+
+} // namespace Inkscape
+
+#endif // INKSCAPE_DISPLAY_DITHER_LOCK_H