1 files changed, 131 insertions, 0 deletions
diff --git a/src/display/drawing-group.cpp b/src/display/drawing-group.cpp
new file mode 100644
index 0000000..12cbf29
--- /dev/null
+++ b/src/display/drawing-group.cpp
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Group belonging to an SVG drawing element.
+ *//*
+ * Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2011 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "drawing-group.h"
+#include "cairo-utils.h"
+#include "drawing-context.h"
+#include "drawing-surface.h"
+#include "drawing-text.h"
+#include "drawing.h"
+#include "style.h"
+
+namespace Inkscape {
+
+DrawingGroup::DrawingGroup(Drawing &drawing)
+    : DrawingItem(drawing) {}
+
+/**
+ * Set whether the group returns children from pick calls.
+ * Previously this feature was called "transparent groups".
+ */
+void DrawingGroup::setPickChildren(bool pick_children)
+{
+    defer([=] {
+        _pick_children = pick_children;
+    });
+}
+
+/**
+ * Set additional transform for the group.
+ * This is applied after the normal transform and mainly useful for
+ * markers, clipping paths, etc.
+ */
+void DrawingGroup::setChildTransform(Geom::Affine const &transform)
+{
+    defer([=] {
+        auto constexpr EPS = 1e-18;
+        auto current = _child_transform ? *_child_transform : Geom::identity();
+        if (Geom::are_near(transform, current, EPS)) return;
+        _markForRendering();
+        _child_transform = transform.isIdentity(EPS) ? nullptr : std::make_unique<Geom::Affine>(transform);
+        _markForUpdate(STATE_ALL, true);
+    });
+}
+
+unsigned DrawingGroup::_updateItem(Geom::IntRect const &area, UpdateContext const &ctx, unsigned flags, unsigned reset)
+{
+    bool outline = _drawing.renderMode() == RenderMode::OUTLINE || _drawing.outlineOverlay();
+
+    UpdateContext child_ctx(ctx);
+    if (_child_transform) {
+        child_ctx.ctm = *_child_transform * ctx.ctm;
+    }
+
+    _bbox = {};
+
+    for (auto &c : _children) {
+        c.update(area, child_ctx, flags, reset);
+        if (c.visible()) {
+            _bbox.unionWith(outline ? c.bbox() : c.drawbox());
+        }
+        _update_complexity += c.getUpdateComplexity();
+        _contains_unisolated_blend |= c.unisolatedBlend();
+    }
+
+    return STATE_ALL;
+}
+
+unsigned DrawingGroup::_renderItem(DrawingContext &dc, RenderContext &rc, Geom::IntRect const &area, unsigned flags, DrawingItem const *stop_at) const
+{
+    if (!stop_at) {
+        // normal rendering
+        for (auto &i : _children) {
+            i.render(dc, rc, area, flags, stop_at);
+        }
+    } else {
+        // background rendering
+        for (auto &i : _children) {
+            if (&i == stop_at) {
+                return RENDER_OK; // do not render the stop_at item at all
+            }
+            if (i.isAncestorOf(stop_at)) {
+                // render its ancestors without masks, opacity or filters
+                i.render(dc, rc, area, flags | RENDER_FILTER_BACKGROUND, stop_at);
+                return RENDER_OK;
+            } else {
+                i.render(dc, rc, area, flags, stop_at);
+            }
+        }
+    }
+    return RENDER_OK;
+}
+
+void DrawingGroup::_clipItem(DrawingContext &dc, RenderContext &rc, Geom::IntRect const &area) const
+{
+    for (auto &i : _children) {
+        i.clip(dc, rc, area);
+    }
+}
+
+DrawingItem *DrawingGroup::_pickItem(Geom::Point const &p, double delta, unsigned flags)
+{
+    for (auto &i : _children) {
+        DrawingItem *picked = i.pick(p, delta, flags);
+        if (picked) {
+            return _pick_children ? picked : this;
+        }
+    }
+    return nullptr;
+}
+
+} // 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:fileencoding=utf-8:textwidth=99 :