1/*
2 * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
3 *               2008 Dirk Schulze <krit@webkit.org>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28
29#if ENABLE(SVG)
30#include "SVGPaintServerPattern.h"
31
32#include "AffineTransform.h"
33#include "GraphicsContext.h"
34#include "Image.h"
35#include "ImageBuffer.h"
36#include "Pattern.h"
37#include "RenderObject.h"
38#include "SVGPatternElement.h"
39#include "SVGRenderTreeAsText.h"
40
41using namespace std;
42
43namespace WebCore {
44
45SVGPaintServerPattern::SVGPaintServerPattern(const SVGPatternElement* owner)
46    : m_ownerElement(owner)
47    , m_pattern(0)
48{
49    ASSERT(owner);
50}
51
52SVGPaintServerPattern::~SVGPaintServerPattern()
53{
54}
55
56FloatRect SVGPaintServerPattern::patternBoundaries() const
57{
58    return m_patternBoundaries;
59}
60
61void SVGPaintServerPattern::setPatternBoundaries(const FloatRect& rect)
62{
63    m_patternBoundaries = rect;
64}
65
66ImageBuffer* SVGPaintServerPattern::tile() const
67{
68    return m_tile.get();
69}
70
71void SVGPaintServerPattern::setTile(PassOwnPtr<ImageBuffer> tile)
72{
73    m_tile = tile;
74}
75
76AffineTransform SVGPaintServerPattern::patternTransform() const
77{
78    return m_patternTransform;
79}
80
81void SVGPaintServerPattern::setPatternTransform(const AffineTransform& transform)
82{
83    m_patternTransform = transform;
84}
85
86TextStream& SVGPaintServerPattern::externalRepresentation(TextStream& ts) const
87{
88    // Gradients/patterns aren't setup, until they are used for painting. Work around that fact.
89    m_ownerElement->buildPattern(FloatRect(0.0f, 0.0f, 1.0f, 1.0f));
90
91    ts << "[type=PATTERN]"
92        << " [bbox=" << patternBoundaries() << "]";
93    if (!patternTransform().isIdentity())
94        ts << " [pattern transform=" << patternTransform() << "]";
95    return ts;
96}
97
98bool SVGPaintServerPattern::setup(GraphicsContext*& context, const RenderObject* object, const RenderStyle* style, SVGPaintTargetType type, bool isPaintingText) const
99{
100    FloatRect targetRect = object->objectBoundingBox();
101
102    const SVGRenderStyle* svgStyle = style->svgStyle();
103    bool isFilled = (type & ApplyToFillTargetType) && svgStyle->hasFill();
104    bool isStroked = (type & ApplyToStrokeTargetType) && svgStyle->hasStroke();
105
106    ASSERT((isFilled && !isStroked) || (!isFilled && isStroked));
107
108    m_ownerElement->buildPattern(targetRect);
109    if (!tile())
110        return false;
111
112    context->save();
113
114    ASSERT(!m_pattern);
115
116    IntRect tileRect = tile()->image()->rect();
117    if (tileRect.width() > patternBoundaries().width() || tileRect.height() > patternBoundaries().height()) {
118        // Draw the first cell of the pattern manually to support overflow="visible" on all platforms.
119        int tileWidth = static_cast<int>(patternBoundaries().width() + 0.5f);
120        int tileHeight = static_cast<int>(patternBoundaries().height() + 0.5f);
121        OwnPtr<ImageBuffer> tileImage = ImageBuffer::create(IntSize(tileWidth, tileHeight));
122
123        GraphicsContext* tileImageContext = tileImage->context();
124
125        int numY = static_cast<int>(ceilf(tileRect.height() / tileHeight)) + 1;
126        int numX = static_cast<int>(ceilf(tileRect.width() / tileWidth)) + 1;
127
128        tileImageContext->save();
129        tileImageContext->translate(-patternBoundaries().width() * numX, -patternBoundaries().height() * numY);
130        for (int i = numY; i > 0; i--) {
131            tileImageContext->translate(0, patternBoundaries().height());
132            for (int j = numX; j > 0; j--) {
133                tileImageContext->translate(patternBoundaries().width(), 0);
134                tileImageContext->drawImage(tile()->image(), style->colorSpace(), tileRect, tileRect);
135            }
136            tileImageContext->translate(-patternBoundaries().width() * numX, 0);
137        }
138        tileImageContext->restore();
139
140        m_pattern = Pattern::create(tileImage->image(), true, true);
141    }
142    else
143        m_pattern = Pattern::create(tile()->image(), true, true);
144
145    if (isFilled) {
146        context->setAlpha(svgStyle->fillOpacity());
147        context->setFillPattern(m_pattern);
148        context->setFillRule(svgStyle->fillRule());
149    }
150    if (isStroked) {
151        context->setAlpha(svgStyle->strokeOpacity());
152        context->setStrokePattern(m_pattern);
153        applyStrokeStyleToContext(context, style, object);
154    }
155
156    AffineTransform matrix;
157    matrix.translate(patternBoundaries().x(), patternBoundaries().y());
158    matrix.multiply(patternTransform());
159    m_pattern->setPatternSpaceTransform(matrix);
160
161    if (isPaintingText) {
162        context->setTextDrawingMode(isFilled ? cTextFill : cTextStroke);
163#if PLATFORM(CG)
164        if (isFilled)
165            context->applyFillPattern();
166        else
167            context->applyStrokePattern();
168#endif
169    }
170
171    return true;
172}
173
174void SVGPaintServerPattern::teardown(GraphicsContext*& context, const RenderObject*, SVGPaintTargetType, bool) const
175{
176    m_pattern = 0;
177
178    context->restore();
179}
180
181} // namespace WebCore
182
183#endif
184