1 files changed, 303 insertions, 0 deletions
diff --git a/src/object/sp-clippath.cpp b/src/object/sp-clippath.cpp
new file mode 100644
index 0000000..31c9c1d
--- /dev/null
+++ b/src/object/sp-clippath.cpp
@@ -0,0 +1,303 @@
+// 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"
+
+static SPClipPathView*      sp_clippath_view_new_prepend(SPClipPathView *list, unsigned int key, Inkscape::DrawingItem *arenaitem);
+static SPClipPathView*      sp_clippath_view_list_remove(SPClipPathView *list, SPClipPathView *view);
+
+SPClipPath::SPClipPath() : SPObjectGroup() {
+    this->clipPathUnits_set = FALSE;
+    this->clipPathUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
+
+    this->display = nullptr;
+}
+
+SPClipPath::~SPClipPath() = default;
+
+void SPClipPath::build(SPDocument* doc, Inkscape::XML::Node* repr) {
+    SPObjectGroup::build(doc, repr);
+
+    this->readAttr(SPAttr::STYLE);
+    this->readAttr(SPAttr::CLIPPATHUNITS);
+
+    /* Register ourselves */
+    doc->addResource("clipPath", this);
+}
+
+void SPClipPath::release() {
+    if (this->document) {
+        // Unregister ourselves
+        this->document->removeResource("clipPath", this);
+    }
+
+    while (this->display) {
+        /* We simply unref and let item manage this in handler */
+        this->display = sp_clippath_view_list_remove(this->display, this->display);
+    }
+
+    SPObjectGroup::release();
+}
+
+void SPClipPath::set(SPAttr key, const gchar* value) {
+    switch (key) {
+        case SPAttr::CLIPPATHUNITS:
+            this->clipPathUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
+            this->clipPathUnits_set = FALSE;
+            
+            if (value) {
+                if (!strcmp(value, "userSpaceOnUse")) {
+                    this->clipPathUnits_set = TRUE;
+                } else if (!strcmp(value, "objectBoundingBox")) {
+                    this->clipPathUnits = SP_CONTENT_UNITS_OBJECTBOUNDINGBOX;
+                    this->clipPathUnits_set = TRUE;
+                }
+            }
+            
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+        default:
+            if (SP_ATTRIBUTE_IS_CSS(key)) {
+                this->style->clear(key);
+                this->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) {
+    /* Invoke SPObjectGroup implementation */
+	SPObjectGroup::child_added(child, ref);
+
+    /* Show new object */
+    SPObject *ochild = this->document->getObjectByRepr(child);
+
+    if (SP_IS_ITEM(ochild)) {
+        for (SPClipPathView *v = this->display; v != nullptr; v = v->next) {
+            Inkscape::DrawingItem *ac = SP_ITEM(ochild)->invoke_show(v->arenaitem->drawing(), v->key, SP_ITEM_REFERENCE_FLAGS);
+
+            if (ac) {
+                v->arenaitem->prependChild(ac);
+            }
+        }
+    }
+}
+
+void SPClipPath::update(SPCtx* ctx, unsigned int flags) {
+    if (flags & SP_OBJECT_MODIFIED_FLAG) {
+        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
+    }
+
+    flags &= SP_OBJECT_MODIFIED_CASCADE;
+
+    std::vector<SPObject *> l;
+    for (auto& child: children) {
+        sp_object_ref(&child);
+        l.push_back(&child);
+    }
+
+    for (auto child:l) {
+        if (flags || (child->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            child->updateDisplay(ctx, flags);
+        }
+
+        sp_object_unref(child);
+    }
+
+    for (SPClipPathView *v = this->display; v != nullptr; v = v->next) {
+        Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);
+
+        if (this->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX && v->bbox) {
+            Geom::Affine t = Geom::Scale(v->bbox->dimensions());
+            t.setTranslation(v->bbox->min());
+            g->setChildTransform(t);
+        } else {
+            g->setChildTransform(Geom::identity());
+        }
+    }
+}
+
+void SPClipPath::modified(unsigned int flags) {
+    if (flags & SP_OBJECT_MODIFIED_FLAG) {
+        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
+    }
+
+    flags &= SP_OBJECT_MODIFIED_CASCADE;
+
+    std::vector<SPObject *> l;
+    for (auto& child: children) {
+        sp_object_ref(&child);
+        l.push_back(&child);
+    }
+
+    for (auto child:l) {
+        if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            child->emitModified(flags);
+        }
+        sp_object_unref(child);
+    }
+}
+
+Inkscape::XML::Node* SPClipPath::write(Inkscape::XML::Document* xml_doc, Inkscape::XML::Node* repr, guint 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 int key) {
+    Inkscape::DrawingGroup *ai = new Inkscape::DrawingGroup(drawing);
+    display = sp_clippath_view_new_prepend(display, key, ai);
+
+    for (auto& child: children) {
+        if (SP_IS_ITEM(&child)) {
+            Inkscape::DrawingItem *ac = SP_ITEM(&child)->invoke_show(drawing, key, SP_ITEM_REFERENCE_FLAGS);
+
+            if (ac) {
+                /* The order is not important in clippath */
+                ai->appendChild(ac);
+            }
+        }
+    }
+
+    if (clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX && display->bbox) {
+        Geom::Affine t = Geom::Scale(display->bbox->dimensions());
+        t.setTranslation(display->bbox->min());
+        ai->setChildTransform(t);
+    }
+
+    ai->setStyle(this->style);
+
+    return ai;
+}
+
+void SPClipPath::hide(unsigned int key) {
+    for (auto& child: children) {
+        if (SP_IS_ITEM(&child)) {
+            SP_ITEM(&child)->invoke_hide(key);
+        }
+    }
+    for (SPClipPathView *v = display; v != nullptr; v = v->next) {
+        if (v->key == key) {
+            /* We simply unref and let item to manage this in handler */
+            display = sp_clippath_view_list_remove(display, v);
+            return;
+        }
+    }
+}
+
+void SPClipPath::setBBox(unsigned int key, Geom::OptRect const &bbox) {
+    for (SPClipPathView *v = display; v != nullptr; v = v->next) {
+        if (v->key == key) {
+            v->bbox = bbox;
+            break;
+        }
+    }
+}
+
+Geom::OptRect SPClipPath::geometricBounds(Geom::Affine const &transform) {
+    Geom::OptRect bbox;
+    for (auto& i: children) {
+        if (SP_IS_ITEM(&i)) {
+            Geom::OptRect tmp = SP_ITEM(&i)->geometricBounds(SP_ITEM(&i)->transform * transform);
+            bbox.unionWith(tmp);
+        }
+    }
+    return bbox;
+}
+
+/* ClipPath views */
+
+SPClipPathView *
+sp_clippath_view_new_prepend(SPClipPathView *list, unsigned int key, Inkscape::DrawingItem *arenaitem)
+{
+    SPClipPathView *new_path_view = g_new(SPClipPathView, 1);
+
+    new_path_view->next = list;
+    new_path_view->key = key;
+    new_path_view->arenaitem = arenaitem;
+    new_path_view->bbox = Geom::OptRect();
+
+    return new_path_view;
+}
+
+SPClipPathView *
+sp_clippath_view_list_remove(SPClipPathView *list, SPClipPathView *view)
+{
+    if (view == list) {
+        list = list->next;
+    } else {
+        SPClipPathView *prev;
+        prev = list;
+        while (prev->next != view) prev = prev->next;
+        prev->next = view->next;
+    }
+
+    delete view->arenaitem;
+    g_free(view);
+
+    return list;
+}
+
+// Create a mask element (using passed elements), add it to <defs>
+const gchar *SPClipPath::create (std::vector<Inkscape::XML::Node*> &reprs, SPDocument *document)
+{
+    Inkscape::XML::Node *defsrepr = document->getDefs()->getRepr();
+
+    Inkscape::XML::Document *xml_doc = document->getReprDoc();
+    Inkscape::XML::Node *repr = xml_doc->createElement("svg:clipPath");
+    repr->setAttribute("clipPathUnits", "userSpaceOnUse");
+
+    defsrepr->appendChild(repr);
+    const gchar *id = repr->attribute("id");
+    SPObject *clip_path_object = document->getObjectById(id);
+
+    for (auto node : reprs) {
+        clip_path_object->appendChildRepr(node);
+    }
+
+    Inkscape::GC::release(repr);
+    return id;
+}
+
+/*
+  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 :