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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2005 Eric Seidel <eric (at) webkit.org>
      5  * Copyright (C) 2010 Dirk Schulze <krit (at) webkit.org>
      6  * Copyright (C) 2013 Google Inc. All rights reserved.
      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 #include "core/svg/graphics/filters/SVGFEImage.h"
     27 
     28 #include "SkBitmapSource.h"
     29 #include "core/rendering/RenderObject.h"
     30 #include "core/rendering/svg/SVGRenderingContext.h"
     31 #include "core/svg/SVGElement.h"
     32 #include "core/svg/SVGURIReference.h"
     33 #include "platform/graphics/GraphicsContext.h"
     34 #include "platform/graphics/filters/Filter.h"
     35 #include "platform/text/TextStream.h"
     36 #include "platform/transforms/AffineTransform.h"
     37 
     38 namespace WebCore {
     39 
     40 FEImage::FEImage(Filter* filter, PassRefPtr<Image> image, const SVGPreserveAspectRatio& preserveAspectRatio)
     41     : FilterEffect(filter)
     42     , m_image(image)
     43     , m_document(0)
     44     , m_preserveAspectRatio(preserveAspectRatio)
     45 {
     46 }
     47 
     48 FEImage::FEImage(Filter* filter, Document& document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
     49     : FilterEffect(filter)
     50     , m_document(&document)
     51     , m_href(href)
     52     , m_preserveAspectRatio(preserveAspectRatio)
     53 {
     54 }
     55 
     56 PassRefPtr<FEImage> FEImage::createWithImage(Filter* filter, PassRefPtr<Image> image, const SVGPreserveAspectRatio& preserveAspectRatio)
     57 {
     58     return adoptRef(new FEImage(filter, image, preserveAspectRatio));
     59 }
     60 
     61 PassRefPtr<FEImage> FEImage::createWithIRIReference(Filter* filter, Document& document, const String& href, const SVGPreserveAspectRatio& preserveAspectRatio)
     62 {
     63     return adoptRef(new FEImage(filter, document, href, preserveAspectRatio));
     64 }
     65 
     66 void FEImage::determineAbsolutePaintRect()
     67 {
     68     FloatRect paintRect = filter()->absoluteTransform().mapRect(filterPrimitiveSubregion());
     69     FloatRect srcRect;
     70     if (m_image) {
     71         srcRect.setSize(m_image->size());
     72         m_preserveAspectRatio.transformRect(paintRect, srcRect);
     73     } else if (RenderObject* renderer = referencedRenderer())
     74         srcRect = filter()->absoluteTransform().mapRect(renderer->repaintRectInLocalCoordinates());
     75 
     76     if (clipsToBounds())
     77         paintRect.intersect(maxEffectRect());
     78     else
     79         paintRect.unite(maxEffectRect());
     80     setAbsolutePaintRect(enclosingIntRect(paintRect));
     81 }
     82 
     83 RenderObject* FEImage::referencedRenderer() const
     84 {
     85     if (!m_document)
     86         return 0;
     87     Element* hrefElement = SVGURIReference::targetElementFromIRIString(m_href, *m_document);
     88     if (!hrefElement || !hrefElement->isSVGElement())
     89         return 0;
     90     return hrefElement->renderer();
     91 }
     92 
     93 void FEImage::applySoftware()
     94 {
     95     RenderObject* renderer = referencedRenderer();
     96     if (!m_image && !renderer)
     97         return;
     98 
     99     ImageBuffer* resultImage = createImageBufferResult();
    100     if (!resultImage)
    101         return;
    102 
    103     FloatRect destRect = filter()->absoluteTransform().mapRect(filterPrimitiveSubregion());
    104 
    105     FloatRect srcRect;
    106     if (renderer)
    107         srcRect = filter()->absoluteTransform().mapRect(renderer->repaintRectInLocalCoordinates());
    108     else {
    109         srcRect = FloatRect(FloatPoint(), m_image->size());
    110         m_preserveAspectRatio.transformRect(destRect, srcRect);
    111     }
    112 
    113     IntPoint paintLocation = absolutePaintRect().location();
    114     destRect.move(-paintLocation.x(), -paintLocation.y());
    115 
    116     // FEImage results are always in ColorSpaceDeviceRGB
    117     setResultColorSpace(ColorSpaceDeviceRGB);
    118 
    119     if (renderer) {
    120         SVGElement* contextNode = toSVGElement(renderer->node());
    121         if (contextNode->hasRelativeLengths()) {
    122             SVGLengthContext lengthContext(contextNode);
    123             FloatSize viewportSize;
    124 
    125             // If we're referencing an element with percentage units, eg. <rect with="30%"> those values were resolved against the viewport.
    126             // Build up a transformation that maps from the viewport space to the filter primitive subregion.
    127             if (lengthContext.determineViewport(viewportSize))
    128                 resultImage->context()->concatCTM(makeMapBetweenRects(FloatRect(FloatPoint(), viewportSize), destRect));
    129         } else {
    130             const AffineTransform& absoluteTransform = filter()->absoluteTransform();
    131             resultImage->context()->concatCTM(absoluteTransform);
    132         }
    133 
    134         AffineTransform contentTransformation;
    135         SVGRenderingContext::renderSubtree(resultImage->context(), renderer, contentTransformation);
    136         return;
    137     }
    138 
    139     resultImage->context()->drawImage(m_image.get(), destRect, srcRect);
    140 }
    141 
    142 TextStream& FEImage::externalRepresentation(TextStream& ts, int indent) const
    143 {
    144     IntSize imageSize;
    145     if (m_image)
    146         imageSize = m_image->size();
    147     else if (RenderObject* renderer = referencedRenderer())
    148         imageSize = enclosingIntRect(renderer->repaintRectInLocalCoordinates()).size();
    149     writeIndent(ts, indent);
    150     ts << "[feImage";
    151     FilterEffect::externalRepresentation(ts);
    152     ts << " image-size=\"" << imageSize.width() << "x" << imageSize.height() << "\"]\n";
    153     // FIXME: should this dump also object returned by SVGFEImage::image() ?
    154     return ts;
    155 }
    156 
    157 PassRefPtr<SkImageFilter> FEImage::createImageFilter(SkiaImageFilterBuilder* builder)
    158 {
    159     if (!m_image)
    160         return 0;
    161 
    162     if (!m_image->nativeImageForCurrentFrame())
    163         return 0;
    164 
    165     return adoptRef(new SkBitmapSource(m_image->nativeImageForCurrentFrame()->bitmap()));
    166 }
    167 
    168 } // namespace WebCore
    169