1 files changed, 291 insertions, 0 deletions
diff --git a/src/object/sp-clippath.cpp b/src/object/sp-clippath.cpp
new file mode 100644
index 0000000..1d741e5
--- /dev/null
+++ b/src/object/sp-clippath.cpp
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <clipPath> implementation
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2001-2002 authors
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <string>
+
+#include "xml/repr.h"
+
+#include "enums.h"
+#include "attributes.h"
+#include "document.h"
+#include "style.h"
+
+#include <2geom/transforms.h>
+
+#include "sp-clippath.h"
+#include "sp-item.h"
+#include "sp-defs.h"
+
+#include "display/drawing-item.h"
+#include "display/drawing-group.h"
+
+SPClipPath::SPClipPath()
+{
+    clipPathUnits_set = false;
+    clipPathUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
+}
+
+SPClipPath::~SPClipPath() = default;
+
+void SPClipPath::build(SPDocument *doc, Inkscape::XML::Node *repr)
+{
+    SPObjectGroup::build(doc, repr);
+
+    readAttr(SPAttr::STYLE);
+    readAttr(SPAttr::CLIPPATHUNITS);
+
+    doc->addResource("clipPath", this);
+}
+
+void SPClipPath::release()
+{
+    if (document) {
+        document->removeResource("clipPath", this);
+    }
+
+    views.clear();
+
+    SPObjectGroup::release();
+}
+
+void SPClipPath::set(SPAttr key, char const *value)
+{
+    switch (key) {
+        case SPAttr::CLIPPATHUNITS:
+            clipPathUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
+            clipPathUnits_set = false;
+            
+            if (value) {
+                if (!std::strcmp(value, "userSpaceOnUse")) {
+                    clipPathUnits_set = true;
+                } else if (!std::strcmp(value, "objectBoundingBox")) {
+                    clipPathUnits = SP_CONTENT_UNITS_OBJECTBOUNDINGBOX;
+                    clipPathUnits_set = true;
+                }
+            }
+            
+            requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        default:
+            if (SP_ATTRIBUTE_IS_CSS(key)) {
+                style->clear(key);
+                requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
+            } else {
+                SPObjectGroup::set(key, value);
+            }
+            break;
+    }
+}
+
+void SPClipPath::child_added(Inkscape::XML::Node *child, Inkscape::XML::Node *ref)
+{
+    SPObjectGroup::child_added(child, ref);
+
+    if (auto item = cast<SPItem>(document->getObjectByRepr(child))) {
+        for (auto &v : views) {
+            auto ac = item->invoke_show(v.drawingitem->drawing(), v.key, SP_ITEM_REFERENCE_FLAGS);
+            if (ac) {
+                v.drawingitem->prependChild(ac);
+            }
+        }
+    }
+}
+
+void SPClipPath::update(SPCtx *ctx, unsigned flags)
+{
+    auto const cflags = cascade_flags(flags);
+
+    for (auto c : childList(true)) {
+        if (cflags || (c->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            c->updateDisplay(ctx, cflags);
+        }
+        sp_object_unref(c);
+    }
+
+    for (auto &v : views) {
+        update_view(v);
+    }
+}
+
+void SPClipPath::update_view(View &v)
+{
+    if (clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX && v.bbox) {
+        v.drawingitem->setChildTransform(Geom::Scale(v.bbox->dimensions()) * Geom::Translate(v.bbox->min()));
+    } else {
+        v.drawingitem->setChildTransform(Geom::identity());
+    }
+}
+
+void SPClipPath::modified(unsigned flags)
+{
+    auto const cflags = cascade_flags(flags);
+
+    for (auto c : childList(true)) {
+        if (cflags || (c->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            c->emitModified(cflags);
+        }
+        sp_object_unref(c);
+    }
+}
+
+Inkscape::XML::Node *SPClipPath::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, unsigned flags)
+{
+    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+        repr = xml_doc->createElement("svg:clipPath");
+    }
+
+    SPObjectGroup::write(xml_doc, repr, flags);
+
+    return repr;
+}
+
+Inkscape::DrawingItem *SPClipPath::show(Inkscape::Drawing &drawing, unsigned key, Geom::OptRect const &bbox)
+{
+    views.emplace_back(make_drawingitem<Inkscape::DrawingGroup>(drawing), bbox, key);
+    auto &v = views.back();
+    auto root = v.drawingitem.get();
+
+    for (auto &child : children) {
+        if (auto item = cast<SPItem>(&child)) {
+            auto ac = item->invoke_show(drawing, key, SP_ITEM_REFERENCE_FLAGS);
+            if (ac) {
+                // The order is not important in clippath.
+                root->appendChild(ac);
+            }
+        }
+    }
+
+    root->setStyle(style);
+
+    update_view(v);
+
+    return root;
+}
+
+void SPClipPath::hide(unsigned key)
+{
+    for (auto &child : children) {
+        if (auto item = cast<SPItem>(&child)) {
+            item->invoke_hide(key);
+        }
+    }
+
+    auto it = std::find_if(views.begin(), views.end(), [=] (auto &v) {
+        return v.key == key;
+    });
+
+    if (it == views.end()) {
+        return;
+    }
+
+    views.erase(it);
+}
+
+void SPClipPath::setBBox(unsigned key, Geom::OptRect const &bbox)
+{
+    auto it = std::find_if(views.begin(), views.end(), [=] (auto &v) {
+        return v.key == key;
+    });
+    assert(it != views.end());
+    auto &v = *it;
+
+    v.bbox = bbox;
+    update_view(v);
+}
+
+Geom::OptRect SPClipPath::geometricBounds(Geom::Affine const &transform) const
+{
+    Geom::OptRect bbox;
+    for (auto &child : children) {
+        if (auto item = cast<SPItem>(&child)) {
+            bbox.unionWith(item->geometricBounds(item->transform * transform));
+        }
+    }
+    return bbox;
+}
+
+// Create a mask element (using passed elements), add it to <defs>
+char const *SPClipPath::create(std::vector<Inkscape::XML::Node*> &reprs, SPDocument *document)
+{
+    auto defsrepr = document->getDefs()->getRepr();
+
+    auto xml_doc = document->getReprDoc();
+    auto repr = xml_doc->createElement("svg:clipPath");
+    repr->setAttribute("clipPathUnits", "userSpaceOnUse");
+
+    defsrepr->appendChild(repr);
+    auto id = repr->attribute("id");
+    auto clip_path_object = document->getObjectById(id);
+
+    for (auto node : reprs) {
+        clip_path_object->appendChildRepr(node);
+    }
+
+    Inkscape::GC::release(repr);
+    return id;
+}
+
+SPClipPath::View::View(DrawingItemPtr<Inkscape::DrawingGroup> drawingitem, Geom::OptRect const &bbox, unsigned key)
+    : drawingitem(std::move(drawingitem))
+    , bbox(bbox)
+    , key(key) {}
+
+bool SPClipPathReference::_acceptObject(SPObject *obj) const
+{
+    if (!is<SPClipPath>(obj)) {
+        return false;
+    }
+
+    if (URIReference::_acceptObject(obj)) {
+        return true;
+    }
+
+    auto const owner = getOwner();
+    //XML Tree being used directly here while it shouldn't be...
+    auto const owner_repr = owner->getRepr();
+    //XML Tree being used directly here while it shouldn't be...
+    auto const obj_repr = obj->getRepr();
+    char const *owner_name = "";
+    char const *owner_clippath = "";
+    char const *obj_name = "";
+    char const *obj_id = "";
+    if (owner_repr) {
+        owner_name = owner_repr->name();
+        owner_clippath = owner_repr->attribute("clippath");
+    }
+    if (obj_repr) {
+        obj_name = obj_repr->name();
+        obj_id = obj_repr->attribute("id");
+    }
+    std::printf("WARNING: Ignoring recursive clippath reference "
+                "<%s clippath=\"%s\"> in <%s id=\"%s\">",
+                owner_name, owner_clippath,
+                obj_name, obj_id);
+
+    return false;
+}
+
+/*
+  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 :