1/*
2 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
3 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
4 * Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
5 * Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
6 * Copyright (C) 2009 Google, Inc.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB.  If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 */
23
24#include "config.h"
25
26#if ENABLE(SVG)
27#include "SVGMarkerLayoutInfo.h"
28
29#include "RenderSVGResourceMarker.h"
30
31namespace WebCore {
32
33SVGMarkerLayoutInfo::SVGMarkerLayoutInfo()
34    : m_midMarker(0)
35    , m_elementIndex(0)
36    , m_strokeWidth(0)
37{
38}
39
40SVGMarkerLayoutInfo::~SVGMarkerLayoutInfo()
41{
42}
43
44static inline void processStartAndMidMarkers(void* infoPtr, const PathElement* element)
45{
46    SVGMarkerLayoutInfo& info = *reinterpret_cast<SVGMarkerLayoutInfo*>(infoPtr);
47    SVGMarkerData& markerData = info.markerData();
48    int& elementIndex = info.elementIndex();
49
50    // First update the outslope for the previous element
51    markerData.updateOutslope(element->points[0]);
52
53    // Draw the marker for the previous element
54    RenderSVGResourceMarker* marker = markerData.marker();
55    if (elementIndex > 0 && marker)
56        info.addLayoutedMarker(marker, markerData.origin(), markerData.currentAngle());
57
58    // Update our marker data for this element
59    markerData.updateMarkerDataForPathElement(element);
60
61    // After drawing the start marker, switch to drawing mid markers
62    if (elementIndex == 1)
63        markerData.updateTypeAndMarker(SVGMarkerData::Mid, info.midMarker());
64
65    ++elementIndex;
66}
67
68FloatRect SVGMarkerLayoutInfo::calculateBoundaries(RenderSVGResourceMarker* startMarker, RenderSVGResourceMarker* midMarker, RenderSVGResourceMarker* endMarker, float strokeWidth, const Path& path)
69{
70    m_layout.clear();
71    m_midMarker = midMarker;
72    m_strokeWidth = strokeWidth;
73    m_elementIndex = 0;
74    m_markerData = SVGMarkerData(SVGMarkerData::Start, startMarker);
75    path.apply(this, processStartAndMidMarkers);
76
77    if (endMarker) {
78        m_markerData.updateTypeAndMarker(SVGMarkerData::End, endMarker);
79        addLayoutedMarker(endMarker, m_markerData.origin(), m_markerData.currentAngle());
80    }
81
82    if (m_layout.isEmpty())
83        return FloatRect();
84
85    Vector<MarkerLayout>::iterator it = m_layout.begin();
86    Vector<MarkerLayout>::iterator end = m_layout.end();
87
88    FloatRect bounds;
89    for (; it != end; ++it) {
90        MarkerLayout& layout = *it;
91
92        RenderSVGResourceMarker* markerContent = layout.marker;
93        ASSERT(markerContent);
94
95        bounds.unite(markerContent->markerBoundaries(layout.matrix));
96    }
97
98    return bounds;
99}
100
101void SVGMarkerLayoutInfo::clear()
102{
103    m_midMarker = 0;
104    m_elementIndex = 0;
105    m_strokeWidth = 0;
106    m_markerData.updateTypeAndMarker(SVGMarkerData::Unknown, 0);
107    m_layout.clear();
108}
109
110void SVGMarkerLayoutInfo::drawMarkers(PaintInfo& paintInfo)
111{
112    if (m_layout.isEmpty())
113        return;
114
115    Vector<MarkerLayout>::iterator it = m_layout.begin();
116    Vector<MarkerLayout>::iterator end = m_layout.end();
117
118    for (; it != end; ++it) {
119        MarkerLayout& layout = *it;
120        layout.marker->draw(paintInfo, layout.matrix);
121    }
122}
123
124void SVGMarkerLayoutInfo::addLayoutedMarker(RenderSVGResourceMarker* marker, const FloatPoint& origin, float angle)
125{
126    ASSERT(marker);
127    m_layout.append(MarkerLayout(marker, marker->markerTransformation(origin, angle, m_strokeWidth)));
128}
129
130}
131
132#endif // ENABLE(SVG)
133