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-rw-r--r--src/display/drawing-group.cpp165
1 files changed, 165 insertions, 0 deletions
diff --git a/src/display/drawing-group.cpp b/src/display/drawing-group.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Group belonging to an SVG drawing element.
+ *//*
+ * Authors:
+ * Krzysztof KosiƄski <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2011 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "display/drawing-group.h"
+#include "display/cairo-utils.h"
+#include "display/drawing-context.h"
+#include "display/drawing-item.h"
+#include "display/drawing-surface.h"
+#include "display/drawing-text.h"
+#include "display/drawing.h"
+#include "style.h"
+
+namespace Inkscape {
+
+DrawingGroup::DrawingGroup(Drawing &drawing)
+ : DrawingItem(drawing)
+ , _child_transform(nullptr)
+{}
+
+DrawingGroup::~DrawingGroup()
+{
+ delete _child_transform; // delete NULL; is safe
+}
+
+/**
+ * Set whether the group returns children from pick calls.
+ * Previously this feature was called "transparent groups".
+ */
+void
+DrawingGroup::setPickChildren(bool p)
+{
+ _pick_children = p;
+}
+
+/**
+ * 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 &new_trans)
+{
+ Geom::Affine current;
+ if (_child_transform) {
+ current = *_child_transform;
+ }
+
+ if (!Geom::are_near(current, new_trans, 1e-18)) {
+ // mark the area where the object was for redraw.
+ _markForRendering();
+ if (new_trans.isIdentity()) {
+ delete _child_transform; // delete NULL; is safe
+ _child_transform = nullptr;
+ } else {
+ _child_transform = new Geom::Affine(new_trans);
+ }
+ _markForUpdate(STATE_ALL, true);
+ }
+}
+
+unsigned
+DrawingGroup::_updateItem(Geom::IntRect const &area, UpdateContext const &ctx, unsigned flags, unsigned reset)
+{
+ unsigned beststate = STATE_ALL;
+ bool outline = _drawing.outline() || _drawing.outlineOverlay();
+
+ UpdateContext child_ctx(ctx);
+ if (_child_transform) {
+ child_ctx.ctm = *_child_transform * ctx.ctm;
+ }
+ for (auto & i : _children) {
+ i.update(area, child_ctx, flags, reset);
+ }
+ if (beststate & STATE_BBOX) {
+ _bbox = Geom::OptIntRect();
+ for (auto & i : _children) {
+ if (i.visible()) {
+ _bbox.unionWith(outline ? i.geometricBounds() : i.visualBounds());
+ }
+ }
+ }
+ return beststate;
+}
+
+unsigned
+DrawingGroup::_renderItem(DrawingContext &dc, Geom::IntRect const &area, unsigned flags, DrawingItem *stop_at)
+{
+ if (stop_at == nullptr) {
+ // normal rendering
+ for (auto &i : _children) {
+ i.setAntialiasing(_antialias);
+ i.render(dc, 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.setAntialiasing(_antialias);
+ i.render(dc, area, flags | RENDER_FILTER_BACKGROUND, stop_at);
+ return RENDER_OK;
+ } else {
+ i.setAntialiasing(_antialias);
+ i.render(dc, area, flags, stop_at);
+ }
+ }
+ }
+ return RENDER_OK;
+}
+
+void
+DrawingGroup::_clipItem(DrawingContext &dc, Geom::IntRect const &area)
+{
+ for (auto & i : _children) {
+ i.setAntialiasing(_antialias);
+ i.clip(dc, 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;
+}
+
+bool
+DrawingGroup::_canClip()
+{
+ return true;
+}
+
+bool is_drawing_group(DrawingItem *item)
+{
+ return dynamic_cast<DrawingGroup *>(item) != nullptr;
+}
+
+} // end 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 :