1 files changed, 70 insertions, 0 deletions
diff --git a/src/ui/widget/canvas/util.cpp b/src/ui/widget/canvas/util.cpp
new file mode 100644
index 0000000..3d9d59b
--- /dev/null
+++ b/src/ui/widget/canvas/util.cpp
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include "ui/util.h"
+#include "helper/geom.h"
+#include "util.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+void region_to_path(Cairo::RefPtr<Cairo::Context> const &cr, Cairo::RefPtr<Cairo::Region> const &reg)
+{
+    for (int i = 0; i < reg->get_num_rectangles(); i++) {
+        auto rect = reg->get_rectangle(i);
+        cr->rectangle(rect.x, rect.y, rect.width, rect.height);
+    }
+}
+
+Cairo::RefPtr<Cairo::Region> shrink_region(Cairo::RefPtr<Cairo::Region> const &reg, int d, int t)
+{
+    // Find the bounding rect, expanded by 1 in all directions.
+    auto rect = geom_to_cairo(expandedBy(cairo_to_geom(reg->get_extents()), 1));
+
+    // Take the complement of the region within the rect.
+    auto reg2 = Cairo::Region::create(rect);
+    reg2->subtract(reg);
+
+    // Increase the width and height of every rectangle by d.
+    auto reg3 = Cairo::Region::create();
+    for (int i = 0; i < reg2->get_num_rectangles(); i++) {
+        auto rect = reg2->get_rectangle(i);
+        rect.x += t;
+        rect.y += t;
+        rect.width += d;
+        rect.height += d;
+        reg3->do_union(rect);
+    }
+
+    // Take the complement of the region within the rect.
+    reg2 = Cairo::Region::create(rect);
+    reg2->subtract(reg3);
+
+    return reg2;
+}
+
+std::array<float, 3> checkerboard_darken(std::array<float, 3> const &rgb, float amount)
+{
+    std::array<float, 3> hsl;
+    SPColor::rgb_to_hsl_floatv(&hsl[0], rgb[0], rgb[1], rgb[2]);
+    hsl[2] += (hsl[2] < 0.08 ? 0.08 : -0.08) * amount;
+
+    std::array<float, 3> rgb2;
+    SPColor::hsl_to_rgb_floatv(&rgb2[0], hsl[0], hsl[1], hsl[2]);
+
+    return rgb2;
+}
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  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 :