1/*
2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2010 Dirk Schulze <krit@webkit.org>
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB.  If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23#include "config.h"
24
25#if ENABLE(FILTERS)
26#include "SVGFEImage.h"
27
28#include "AffineTransform.h"
29#include "Filter.h"
30#include "GraphicsContext.h"
31#include "RenderElement.h"
32#include "RenderTreeAsText.h"
33#include "SVGElement.h"
34#include "SVGPreserveAspectRatio.h"
35#include "SVGRenderingContext.h"
36#include "SVGURIReference.h"
37#include "TextStream.h"
38
39namespace WebCore {
40
41FEImage::FEImage(Filter* filter, PassRefPtr<Image> image, const SVGPreserveAspectRatio& preserveAspectRatio)
42    : FilterEffect(filter)
43    , m_image(image)
44    , m_document(0)
45    , m_preserveAspectRatio(preserveAspectRatio)
46{
47}
48
49FEImage::FEImage(Filter* filter, Document& document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
50    : FilterEffect(filter)
51    , m_document(&document)
52    , m_href(href)
53    , m_preserveAspectRatio(preserveAspectRatio)
54{
55}
56
57PassRefPtr<FEImage> FEImage::createWithImage(Filter* filter, PassRefPtr<Image> image, const SVGPreserveAspectRatio& preserveAspectRatio)
58{
59    return adoptRef(new FEImage(filter, image, preserveAspectRatio));
60}
61
62PassRefPtr<FEImage> FEImage::createWithIRIReference(Filter* filter, Document& document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
63{
64    return adoptRef(new FEImage(filter, document, href, preserveAspectRatio));
65}
66
67void FEImage::determineAbsolutePaintRect()
68{
69    FloatRect paintRect = filter().absoluteTransform().mapRect(filterPrimitiveSubregion());
70    FloatRect srcRect;
71    if (m_image) {
72        srcRect.setSize(m_image->size());
73        m_preserveAspectRatio.transformRect(paintRect, srcRect);
74    } else if (RenderElement* renderer = referencedRenderer())
75        srcRect = filter().absoluteTransform().mapRect(renderer->repaintRectInLocalCoordinates());
76
77    if (clipsToBounds())
78        paintRect.intersect(maxEffectRect());
79    else
80        paintRect.unite(maxEffectRect());
81    setAbsolutePaintRect(enclosingIntRect(paintRect));
82}
83
84RenderElement* FEImage::referencedRenderer() const
85{
86    if (!m_document)
87        return 0;
88    Element* hrefElement = SVGURIReference::targetElementFromIRIString(m_href, *m_document);
89    if (!hrefElement || !hrefElement->isSVGElement())
90        return 0;
91    return hrefElement->renderer();
92}
93
94void FEImage::platformApplySoftware()
95{
96    RenderElement* renderer = referencedRenderer();
97    if (!m_image && !renderer)
98        return;
99
100    ImageBuffer* resultImage = createImageBufferResult();
101    if (!resultImage)
102        return;
103
104    FloatRect destRect = filter().absoluteTransform().mapRect(filterPrimitiveSubregion());
105
106    FloatRect srcRect;
107    if (renderer)
108        srcRect = filter().absoluteTransform().mapRect(renderer->repaintRectInLocalCoordinates());
109    else {
110        srcRect = FloatRect(FloatPoint(), m_image->size());
111        m_preserveAspectRatio.transformRect(destRect, srcRect);
112    }
113
114    IntPoint paintLocation = absolutePaintRect().location();
115    destRect.move(-paintLocation.x(), -paintLocation.y());
116
117    // FEImage results are always in ColorSpaceDeviceRGB
118    setResultColorSpace(ColorSpaceDeviceRGB);
119
120    if (renderer) {
121        const AffineTransform& absoluteTransform = filter().absoluteTransform();
122        resultImage->context()->concatCTM(absoluteTransform);
123
124        SVGElement* contextNode = toSVGElement(renderer->element());
125        if (contextNode->hasRelativeLengths()) {
126            SVGLengthContext lengthContext(contextNode);
127            FloatSize viewportSize;
128
129            // If we're referencing an element with percentage units, eg. <rect with="30%"> those values were resolved against the viewport.
130            // Build up a transformation that maps from the viewport space to the filter primitive subregion.
131            if (lengthContext.determineViewport(viewportSize))
132                resultImage->context()->concatCTM(makeMapBetweenRects(FloatRect(FloatPoint(), viewportSize), destRect));
133        }
134
135        AffineTransform contentTransformation;
136        SVGRenderingContext::renderSubtreeToImageBuffer(resultImage, *renderer, contentTransformation);
137        return;
138    }
139
140    resultImage->context()->drawImage(m_image.get(), ColorSpaceDeviceRGB, destRect, srcRect);
141}
142
143void FEImage::dump()
144{
145}
146
147TextStream& FEImage::externalRepresentation(TextStream& ts, int indent) const
148{
149    FloatSize imageSize;
150    if (m_image)
151        imageSize = m_image->size();
152    else if (RenderObject* renderer = referencedRenderer())
153        imageSize = enclosingIntRect(renderer->repaintRectInLocalCoordinates()).size();
154    writeIndent(ts, indent);
155    ts << "[feImage";
156    FilterEffect::externalRepresentation(ts);
157    ts << " image-size=\"" << imageSize.width() << "x" << imageSize.height() << "\"]\n";
158    // FIXME: should this dump also object returned by SVGFEImage::image() ?
159    return ts;
160}
161
162} // namespace WebCore
163
164#endif // ENABLE(FILTERS)
165