1 files changed, 337 insertions, 0 deletions
diff --git a/src/object/sp-mask.cpp b/src/object/sp-mask.cpp
new file mode 100644
index 0000000..9c99776
--- /dev/null
+++ b/src/object/sp-mask.cpp
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <mask> implementation
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2003 authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <string>
+#include <2geom/transforms.h>
+
+#include "display/drawing.h"
+#include "display/drawing-group.h"
+#include "xml/repr.h"
+
+#include "enums.h"
+#include "attributes.h"
+#include "document.h"
+#include "style.h"
+#include "attributes.h"
+
+#include "sp-defs.h"
+#include "sp-item.h"
+#include "sp-mask.h"
+
+SPMaskView *sp_mask_view_new_prepend (SPMaskView *list, unsigned int key, Inkscape::DrawingItem *arenaitem);
+SPMaskView *sp_mask_view_list_remove (SPMaskView *list, SPMaskView *view);
+
+SPMask::SPMask() : SPObjectGroup() {
+	this->maskUnits_set = FALSE;
+	this->maskUnits = SP_CONTENT_UNITS_OBJECTBOUNDINGBOX;
+
+	this->maskContentUnits_set = FALSE;
+	this->maskContentUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
+
+	this->display = nullptr;
+}
+
+SPMask::~SPMask() = default;
+
+void SPMask::build(SPDocument* doc, Inkscape::XML::Node* repr) {
+	SPObjectGroup::build(doc, repr);
+
+	this->readAttr(SPAttr::MASKUNITS);
+	this->readAttr(SPAttr::MASKCONTENTUNITS);
+	this->readAttr(SPAttr::STYLE);
+
+	/* Register ourselves */
+	doc->addResource("mask", this);
+}
+
+void SPMask::release() {
+    if (this->document) {
+        // Unregister ourselves
+        this->document->removeResource("mask", this);
+    }
+
+    while (this->display) {
+        // We simply unref and let item manage this in handler
+        this->display = sp_mask_view_list_remove(this->display, this->display);
+    }
+
+    SPObjectGroup::release();
+}
+
+void SPMask::set(SPAttr key, const gchar* value) {
+	switch (key) {
+	case SPAttr::MASKUNITS:
+		this->maskUnits = SP_CONTENT_UNITS_OBJECTBOUNDINGBOX;
+		this->maskUnits_set = FALSE;
+		
+		if (value) {
+			if (!strcmp (value, "userSpaceOnUse")) {
+				this->maskUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
+				this->maskUnits_set = TRUE;
+			} else if (!strcmp (value, "objectBoundingBox")) {
+				this->maskUnits_set = TRUE;
+			}
+		}
+		
+		this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+		break;
+	case SPAttr::MASKCONTENTUNITS:
+		this->maskContentUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
+		this->maskContentUnits_set = FALSE;
+		
+		if (value) {
+			if (!strcmp (value, "userSpaceOnUse")) {
+				this->maskContentUnits_set = TRUE;
+			} else if (!strcmp (value, "objectBoundingBox")) {
+				this->maskContentUnits = SP_CONTENT_UNITS_OBJECTBOUNDINGBOX;
+				this->maskContentUnits_set = TRUE;
+			}
+		}
+		
+		this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+		break;
+	default:
+		SPObjectGroup::set(key, value);
+		break;
+	}
+}
+
+Geom::OptRect 
+SPMask::geometricBounds(Geom::Affine const &transform) {
+    Geom::OptRect bbox;
+
+    for (auto& i: children) {
+        if (SP_IS_ITEM(&i)) {
+            Geom::OptRect tmp = SP_ITEM(&i)->geometricBounds(Geom::Affine(SP_ITEM(&i)->transform) * transform);
+            bbox.unionWith(tmp);
+        }
+    }
+
+    return bbox;
+}
+
+Geom::OptRect 
+SPMask::visualBounds(Geom::Affine const &transform) {
+    Geom::OptRect bbox;
+    for (auto& i: children) {
+        if (SP_IS_ITEM(&i)) {
+            Geom::OptRect tmp = SP_ITEM(&i)->visualBounds(SP_ITEM(&i)->transform * transform);
+            bbox.unionWith(tmp);
+        }
+    }
+
+    return bbox;
+}
+
+void SPMask::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 (SPMaskView *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) {
+			    // @fixme must take position into account
+			    v->arenaitem->prependChild(ac);
+			}
+		}
+	}
+}
+
+
+void SPMask::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 *> children = this->childList(true);
+
+    for (auto child : children) {
+        if (flags || (child->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            child->updateDisplay(ctx, flags);
+        }
+        
+        sp_object_unref(child);
+    }
+
+    for (SPMaskView *v = this->display; v != nullptr; v = v->next) {
+        Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);
+        
+        if (this->maskContentUnits == 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 SPMask::modified(unsigned int flags) {
+    if (flags & SP_OBJECT_MODIFIED_FLAG) {
+        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
+    }
+	
+    flags &= SP_OBJECT_MODIFIED_CASCADE;
+
+    std::vector<SPObject *> children = this->childList(true);
+
+    for (auto child : children) {
+        if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            child->emitModified(flags);
+        }
+        
+        sp_object_unref(child);
+    }
+}
+
+Inkscape::XML::Node* SPMask::write(Inkscape::XML::Document* xml_doc, Inkscape::XML::Node* repr, guint flags) {
+	if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+		repr = xml_doc->createElement("svg:mask");
+	}
+
+	SPObjectGroup::write(xml_doc, repr, flags);
+
+	return repr;
+}
+
+// Create a mask element (using passed elements), add it to <defs>
+const gchar *
+sp_mask_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:mask");
+    repr->setAttribute("maskUnits", "userSpaceOnUse");
+    
+    defsrepr->appendChild(repr);
+    const gchar *mask_id = repr->attribute("id");
+    SPObject *mask_object = document->getObjectById(mask_id);
+    
+    for (auto node : reprs) {
+        mask_object->appendChildRepr(node);
+    }
+
+    if (repr != defsrepr->lastChild())
+        defsrepr->changeOrder(repr, defsrepr->lastChild()); // workaround for bug 989084
+    
+    Inkscape::GC::release(repr);
+    return mask_id;
+}
+
+Inkscape::DrawingItem *SPMask::sp_mask_show(Inkscape::Drawing &drawing, unsigned int key) {
+	g_return_val_if_fail (SP_IS_MASK (this), NULL);
+
+	Inkscape::DrawingGroup *ai = new Inkscape::DrawingGroup(drawing);
+	this->display = sp_mask_view_new_prepend (this->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) {
+				ai->appendChild(ac);
+			}
+		}
+	}
+
+	if (this->maskContentUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX && this->display->bbox) {
+	    Geom::Affine t = Geom::Scale(this->display->bbox->dimensions());
+	    t.setTranslation(this->display->bbox->min());
+	    ai->setChildTransform(t);
+	}
+
+	return ai;
+}
+
+void SPMask::sp_mask_hide(unsigned int key) {
+	g_return_if_fail (SP_IS_MASK (this));
+
+	for (auto& child: children) {
+		if (SP_IS_ITEM (&child)) {
+			SP_ITEM(&child)->invoke_hide (key);
+		}
+	}
+
+	for (SPMaskView *v = this->display; v != nullptr; v = v->next) {
+		if (v->key == key) {
+			/* We simply unref and let item to manage this in handler */
+			this->display = sp_mask_view_list_remove (this->display, v);
+			return;
+		}
+	}
+
+	g_assert_not_reached ();
+}
+
+void SPMask::sp_mask_set_bbox(unsigned int key, Geom::OptRect const &bbox) {
+	for (SPMaskView *v = this->display; v != nullptr; v = v->next) {
+		if (v->key == key) {
+		    v->bbox = bbox;
+		    break;
+		}
+	}
+}
+
+/* Mask views */
+
+SPMaskView *
+sp_mask_view_new_prepend (SPMaskView *list, unsigned int key, Inkscape::DrawingItem *arenaitem)
+{
+	SPMaskView *new_mask_view = g_new (SPMaskView, 1);
+
+	new_mask_view->next = list;
+	new_mask_view->key = key;
+	new_mask_view->arenaitem = arenaitem;
+	new_mask_view->bbox = Geom::OptRect();
+
+	return new_mask_view;
+}
+
+SPMaskView *
+sp_mask_view_list_remove (SPMaskView *list, SPMaskView *view)
+{
+	if (view == list) {
+		list = list->next;
+	} else {
+		SPMaskView *prev;
+		prev = list;
+		while (prev->next != view) prev = prev->next;
+		prev->next = view->next;
+	}
+
+	delete view->arenaitem;
+	g_free (view);
+
+	return list;
+}
+
+/*
+  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 :