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/*
* Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
* Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc.
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
* Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
* Copyright (C) 2011 University of Szeged
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "third_party/blink/renderer/core/layout/svg/layout_svg_path.h"
#include "third_party/blink/renderer/core/layout/svg/layout_svg_resource_marker.h"
#include "third_party/blink/renderer/core/layout/svg/svg_resources.h"
#include "third_party/blink/renderer/core/svg/svg_geometry_element.h"
namespace blink {
namespace {
bool SupportsMarkers(const SVGGeometryElement& element) {
return element.HasTagName(svg_names::kLineTag) ||
element.HasTagName(svg_names::kPathTag) ||
element.HasTagName(svg_names::kPolygonTag) ||
element.HasTagName(svg_names::kPolylineTag);
}
} // namespace
LayoutSVGPath::LayoutSVGPath(SVGGeometryElement* node)
// <line> elements have no joins and thus needn't care about miters.
: LayoutSVGShape(node, IsA<SVGLineElement>(node) ? kNoMiters : kComplex) {
DCHECK(SupportsMarkers(*node));
}
LayoutSVGPath::~LayoutSVGPath() = default;
void LayoutSVGPath::StyleDidChange(StyleDifference diff,
const ComputedStyle* old_style) {
NOT_DESTROYED();
LayoutSVGShape::StyleDidChange(diff, old_style);
SVGResources::UpdateMarkers(*GetElement(), old_style, StyleRef());
}
void LayoutSVGPath::WillBeDestroyed() {
NOT_DESTROYED();
SVGResources::ClearMarkers(*GetElement(), Style());
LayoutSVGShape::WillBeDestroyed();
}
void LayoutSVGPath::UpdateShapeFromElement() {
NOT_DESTROYED();
LayoutSVGShape::UpdateShapeFromElement();
UpdateMarkers();
}
const StylePath* LayoutSVGPath::GetStylePath() const {
NOT_DESTROYED();
if (!IsA<SVGPathElement>(*GetElement()))
return nullptr;
return StyleRef().D();
}
void LayoutSVGPath::UpdateMarkers() {
NOT_DESTROYED();
marker_positions_.clear();
const ComputedStyle& style = StyleRef();
if (!style.HasMarkers())
return;
SVGElementResourceClient* client = SVGResources::GetClient(*this);
if (!client)
return;
auto* marker_start = GetSVGResourceAsType<LayoutSVGResourceMarker>(
*client, style.MarkerStartResource());
auto* marker_mid = GetSVGResourceAsType<LayoutSVGResourceMarker>(
*client, style.MarkerMidResource());
auto* marker_end = GetSVGResourceAsType<LayoutSVGResourceMarker>(
*client, style.MarkerEndResource());
if (!(marker_start || marker_mid || marker_end))
return;
SVGMarkerDataBuilder builder(marker_positions_);
if (const StylePath* style_path = GetStylePath())
builder.Build(style_path->ByteStream());
else
builder.Build(GetPath());
if (marker_positions_.IsEmpty())
return;
const float stroke_width = StrokeWidthForMarkerUnits();
FloatRect boundaries;
for (const auto& position : marker_positions_) {
if (LayoutSVGResourceMarker* marker =
position.SelectMarker(marker_start, marker_mid, marker_end)) {
boundaries.Unite(marker->MarkerBoundaries(
marker->MarkerTransformation(position, stroke_width)));
}
}
stroke_bounding_box_.Unite(boundaries);
}
} // namespace blink
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