1 files changed, 393 insertions, 0 deletions

diff --git a/src/object/sp-root.cpp b/src/object/sp-root.cpp
new file mode 100644
index 0000000..fd0c93c
--- /dev/null
+++ b/src/object/sp-root.cpp
@@ -0,0 +1,393 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * SVG \<svg\> implementation.
+ */
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <string>
+#include <2geom/transforms.h>
+
+#include "attributes.h"
+#include "print.h"
+#include "document.h"
+#include "inkscape-version.h"
+#include "sp-defs.h"
+#include "sp-namedview.h"
+#include "sp-root.h"
+#include "sp-use.h"
+#include "display/drawing-group.h"
+#include "svg/svg.h"
+#include "xml/repr.h"
+#include "util/units.h"
+
+SPRoot::SPRoot() : SPGroup(), SPViewBox()
+{
+    this->onload = nullptr;
+
+    static Inkscape::Version const zero_version(0, 0);
+
+    sp_version_from_string(SVG_VERSION, &this->original.svg);
+    this->version.svg = zero_version;
+    this->original.svg = zero_version;
+    this->version.inkscape = zero_version;
+    this->original.inkscape = zero_version;
+
+    this->unset_x_and_y();
+    this->width.unset(SVGLength::PERCENT, 1.0, 1.0);
+    this->height.unset(SVGLength::PERCENT, 1.0, 1.0);
+
+    this->defs = nullptr;
+}
+
+SPRoot::~SPRoot()
+= default;
+
+void SPRoot::unset_x_and_y()
+{
+    this->x.unset(SVGLength::PERCENT, 0.0, 0.0); // Ignored for root SVG element
+    this->y.unset(SVGLength::PERCENT, 0.0, 0.0);
+}
+
+void SPRoot::build(SPDocument *document, Inkscape::XML::Node *repr)
+{
+    //XML Tree being used directly here while it shouldn't be.
+    if (!this->getRepr()->attribute("version")) {
+        repr->setAttribute("version", SVG_VERSION);
+    }
+
+    this->readAttr(SPAttr::VERSION);
+    this->readAttr(SPAttr::INKSCAPE_VERSION);
+    /* It is important to parse these here, so objects will have viewport build-time */
+    this->readAttr(SPAttr::X);
+    this->readAttr(SPAttr::Y);
+    this->readAttr(SPAttr::WIDTH);
+    this->readAttr(SPAttr::HEIGHT);
+    this->readAttr(SPAttr::VIEWBOX);
+    this->readAttr(SPAttr::PRESERVEASPECTRATIO);
+    this->readAttr(SPAttr::ONLOAD);
+
+    SPGroup::build(document, repr);
+
+    // Search for first <defs> node
+    for (auto& o: children) {
+        if (SP_IS_DEFS(&o)) {
+            this->defs = SP_DEFS(&o);
+            break;
+        }
+    }
+
+    // clear transform, if any was read in - SVG does not allow transform= on <svg>
+    this->transform = Geom::identity();
+}
+
+void SPRoot::release()
+{
+    this->defs = nullptr;
+
+    SPGroup::release();
+}
+
+
+void SPRoot::set(SPAttr key, const gchar *value)
+{
+    switch (key) {
+    case SPAttr::VERSION:
+        if (!sp_version_from_string(value, &this->version.svg)) {
+            this->version.svg = this->original.svg;
+        }
+        break;
+
+    case SPAttr::INKSCAPE_VERSION:
+        if (!sp_version_from_string(value, &this->version.inkscape)) {
+            this->version.inkscape = this->original.inkscape;
+        }
+        break;
+
+    case SPAttr::X:
+        /* Valid for non-root SVG elements; ex, em not handled correctly. */
+        if (!this->x.read(value)) {
+            this->x.unset(SVGLength::PERCENT, 0.0, 0.0);
+        }
+
+        /* fixme: I am almost sure these do not require viewport flag (Lauris) */
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::Y:
+        /* Valid for non-root SVG elements; ex, em not handled correctly. */
+        if (!this->y.read(value)) {
+            this->y.unset(SVGLength::PERCENT, 0.0, 0.0);
+        }
+
+        /* fixme: I am almost sure these do not require viewport flag (Lauris) */
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::WIDTH:
+        if (!this->width.read(value) || !(this->width.computed > 0.0)) {
+            this->width.unset(SVGLength::PERCENT, 1.0, 1.0);
+        }
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::HEIGHT:
+        if (!this->height.read(value) || !(this->height.computed > 0.0)) {
+            this->height.unset(SVGLength::PERCENT, 1.0, 1.0);
+        }
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::VIEWBOX:
+        set_viewBox( value );
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::PRESERVEASPECTRATIO:
+        set_preserveAspectRatio( value );
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::ONLOAD:
+        this->onload = (char *) value;
+        break;
+
+    default:
+        /* Pass the set event to the parent */
+        SPGroup::set(key, value);
+        break;
+    }
+}
+
+void SPRoot::child_added(Inkscape::XML::Node *child, Inkscape::XML::Node *ref)
+{
+    SPGroup::child_added(child, ref);
+
+    SPObject *co = this->document->getObjectByRepr(child);
+    // NOTE: some XML nodes do not have corresponding SP objects,
+    // for instance inkscape:clipboard used in the clipboard code.
+    // See LP bug #1227827
+    //g_assert (co != NULL || !strcmp("comment", child->name())); // comment repr node has no object
+
+    if (co && SP_IS_DEFS(co)) {
+        // We search for first <defs> node - it is not beautiful, but works
+        for (auto& c: children) {
+            if (SP_IS_DEFS(&c)) {
+                this->defs = SP_DEFS(&c);
+                break;
+            }
+        }
+    }
+}
+
+void SPRoot::remove_child(Inkscape::XML::Node *child)
+{
+    if (this->defs && (this->defs->getRepr() == child)) {
+        SPObject *iter = nullptr;
+
+        // We search for first remaining <defs> node - it is not beautiful, but works
+        for (auto& child: children) {
+            iter = &child;
+            if (SP_IS_DEFS(iter) && (SPDefs *)iter != this->defs) {
+                this->defs = (SPDefs *)iter;
+                break;
+            }
+        }
+
+        if (!iter) {
+            /* we should probably create a new <defs> here? */
+            this->defs = nullptr;
+        }
+    }
+
+    SPGroup::remove_child(child);
+}
+
+void SPRoot::setRootDimensions()
+{
+    /*
+     * This is the root SVG element:
+     *
+     * x, y, width, and height apply to positioning the SVG element inside a parent.
+     * For the root SVG in Inkscape there is no parent, thus special rules apply:
+     *   If width, height not set, width = 100%, height = 100% (as always).
+     *   If width and height are in percent, they are percent of viewBox width/height.
+     *   If width, height, and viewBox are not set... pick "random" width/height.
+     *   x, y are ignored.
+     *   initial viewport = (0 0 width height)
+     */
+    if( this->viewBox_set ) {
+
+        if( this->width._set ) {
+            // Check if this is necessary
+            if (this->width.unit == SVGLength::PERCENT) {
+                this->width.computed  = this->width.value  * this->viewBox.width();
+            }
+        } else {
+            this->width.set( SVGLength::PX, this->viewBox.width(),  this->viewBox.width()  );
+        }
+
+        if( this->height._set ) {
+            if (this->height.unit == SVGLength::PERCENT) {
+                this->height.computed = this->height.value * this->viewBox.height();
+            }
+        } else {
+            this->height.set(SVGLength::PX, this->viewBox.height(), this->viewBox.height() );
+        }
+
+    } else {
+
+        if( !this->width._set || this->width.unit == SVGLength::PERCENT) {
+            this->width.set(  SVGLength::PX, 300,  300 ); // CSS/SVG default
+        }
+
+        if( !this->height._set || this->height.unit == SVGLength::PERCENT) {
+            this->height.set( SVGLength::PX, 150,  150 ); // CSS/SVG default
+        }
+    }
+
+    // Ignore x, y values for root element
+    this->unset_x_and_y();
+}
+
+void SPRoot::update(SPCtx *ctx, guint flags)
+{
+    SPItemCtx const *ictx = (SPItemCtx const *) ctx;
+
+    if( !this->parent ) {
+        this->setRootDimensions();
+    }
+
+    // Calculate x, y, width, height from parent/initial viewport
+    this->calcDimsFromParentViewport(ictx, false, cloned ? dynamic_cast<SPUse const *>(parent) : nullptr);
+
+    // std::cout << "SPRoot::update: final:"
+    //           << " x: " << x.computed
+    //           << " y: " << y.computed
+    //           << " width: " << width.computed
+    //           << " height: " << height.computed << std::endl;
+
+    // Calculate new viewport
+    SPItemCtx rctx = *ictx;
+    rctx.viewport = Geom::Rect::from_xywh( this->x.computed, this->y.computed,
+                                           this->width.computed, this->height.computed );
+    rctx = get_rctx( &rctx, Inkscape::Util::Quantity::convert(1, this->document->getDisplayUnit(), "px") );
+
+    /* And invoke parent method */
+    SPGroup::update((SPCtx *) &rctx, flags);
+
+    /* As last step set additional transform of drawing group */
+    for (SPItemView *v = this->display; v != nullptr; v = v->next) {
+        Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);
+        g->setChildTransform(this->c2p);
+    }
+}
+
+void SPRoot::modified(unsigned int flags)
+{
+    SPGroup::modified(flags);
+
+    if (!this->parent && (flags & SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+        // Size of viewport has changed.
+        document->getNamedView()->updateViewPort();
+    }
+}
+
+
+Inkscape::XML::Node *SPRoot::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)
+{
+    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+        repr = xml_doc->createElement("svg:svg");
+    }
+
+    /* Only update version string on successful write to file. This is handled by 'file_save()'.
+     * if (flags & SP_OBJECT_WRITE_EXT) {
+     *   repr->setAttribute("inkscape:version", Inkscape::version_string);
+     * }
+     */
+
+    if (!repr->attribute("version")) {
+        gchar *myversion = sp_version_to_string(this->version.svg);
+        repr->setAttribute("version", myversion);
+        g_free(myversion);
+    }
+
+    if (fabs(this->x.computed) > 1e-9) {
+        repr->setAttributeSvgDouble("x", this->x.computed);
+    }
+
+    if (fabs(this->y.computed) > 1e-9) {
+        repr->setAttributeSvgDouble("y", this->y.computed);
+    }
+
+    /* Unlike all other SPObject, here we want to preserve absolute units too (and only here,
+     * according to the recommendation in http://www.w3.org/TR/SVG11/coords.html#Units).
+     */
+    repr->setAttribute("width", sp_svg_length_write_with_units(this->width));
+    repr->setAttribute("height", sp_svg_length_write_with_units(this->height));
+
+    this->write_viewBox(repr);
+    this->write_preserveAspectRatio(repr);
+
+    SPGroup::write(xml_doc, repr, flags);
+
+    return repr;
+}
+
+Inkscape::DrawingItem *SPRoot::show(Inkscape::Drawing &drawing, unsigned int key, unsigned int flags)
+{
+    Inkscape::DrawingItem *ai = SPGroup::show(drawing, key, flags);
+
+    if (ai) {
+        Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(ai);
+        g->setChildTransform(this->c2p);
+    }
+
+    // Uncomment to print out XML tree
+    // getRepr()->recursivePrintTree(0);
+
+    // Uncomment to print out SP Object tree
+    // recursivePrintTree(0);
+
+    // Uncomment to print out Display Item tree
+    // ai->recursivePrintTree(0);
+
+    return ai;
+}
+
+void SPRoot::print(SPPrintContext *ctx)
+{
+    ctx->bind(this->c2p, 1.0);
+
+    SPGroup::print(ctx);
+
+    ctx->release();
+}
+
+const char *SPRoot::typeName() const {
+    return "image";
+}
+
+const char *SPRoot::displayName() const {
+    return "SVG";  // Do not translate
+}
+
+/*
+  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 :