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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 "SkPictureImageFilter.h"
     30 #include "core/rendering/RenderObject.h"
     31 #include "core/rendering/svg/SVGRenderingContext.h"
     32 #include "core/svg/SVGElement.h"
     33 #include "core/svg/SVGURIReference.h"
     34 #include "platform/graphics/DisplayList.h"
     35 #include "platform/graphics/GraphicsContext.h"
     36 #include "platform/graphics/filters/Filter.h"
     37 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
     38 #include "platform/text/TextStream.h"
     39 #include "platform/transforms/AffineTransform.h"
     40 
     41 namespace blink {
     42 
     43 FEImage::FEImage(Filter* filter, PassRefPtr<Image> image, PassRefPtr<SVGPreserveAspectRatio> preserveAspectRatio)
     44     : FilterEffect(filter)
     45     , m_image(image)
     46     , m_treeScope(0)
     47     , m_preserveAspectRatio(preserveAspectRatio)
     48 {
     49 }
     50 
     51 FEImage::FEImage(Filter* filter, TreeScope& treeScope, const String& href, PassRefPtr<SVGPreserveAspectRatio> preserveAspectRatio)
     52     : FilterEffect(filter)
     53     , m_treeScope(&treeScope)
     54     , m_href(href)
     55     , m_preserveAspectRatio(preserveAspectRatio)
     56 {
     57 }
     58 
     59 PassRefPtr<FEImage> FEImage::createWithImage(Filter* filter, PassRefPtr<Image> image, PassRefPtr<SVGPreserveAspectRatio> preserveAspectRatio)
     60 {
     61     return adoptRef(new FEImage(filter, image, preserveAspectRatio));
     62 }
     63 
     64 PassRefPtr<FEImage> FEImage::createWithIRIReference(Filter* filter, TreeScope& treeScope, const String& href, PassRefPtr<SVGPreserveAspectRatio> preserveAspectRatio)
     65 {
     66     return adoptRef(new FEImage(filter, treeScope, href, preserveAspectRatio));
     67 }
     68 
     69 static FloatRect getRendererRepaintRect(RenderObject* renderer)
     70 {
     71     return renderer->localToParentTransform().mapRect(
     72         renderer->paintInvalidationRectInLocalCoordinates());
     73 }
     74 
     75 AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest)
     76 {
     77     AffineTransform transform;
     78     transform.translate(dest.x() - source.x(), dest.y() - source.y());
     79     transform.scale(dest.width() / source.width(), dest.height() / source.height());
     80     return transform;
     81 }
     82 
     83 FloatRect FEImage::determineAbsolutePaintRect(const FloatRect& originalRequestedRect)
     84 {
     85     RenderObject* renderer = referencedRenderer();
     86     if (!m_image && !renderer)
     87         return FloatRect();
     88 
     89     FloatRect requestedRect = originalRequestedRect;
     90     if (clipsToBounds())
     91         requestedRect.intersect(maxEffectRect());
     92 
     93     FloatRect destRect = filter()->mapLocalRectToAbsoluteRect(filterPrimitiveSubregion());
     94     FloatRect srcRect;
     95     if (renderer) {
     96         srcRect = getRendererRepaintRect(renderer);
     97         SVGElement* contextNode = toSVGElement(renderer->node());
     98 
     99         if (contextNode->hasRelativeLengths()) {
    100             // FIXME: This fixes relative lengths but breaks non-relative ones (see crbug/260709).
    101             SVGLengthContext lengthContext(contextNode);
    102             FloatSize viewportSize;
    103             if (lengthContext.determineViewport(viewportSize)) {
    104                 srcRect = makeMapBetweenRects(FloatRect(FloatPoint(), viewportSize), destRect).mapRect(srcRect);
    105             }
    106         } else {
    107             srcRect = filter()->mapLocalRectToAbsoluteRect(srcRect);
    108             srcRect.move(destRect.x(), destRect.y());
    109         }
    110         destRect.intersect(srcRect);
    111     } else {
    112         srcRect = FloatRect(FloatPoint(), m_image->size());
    113         m_preserveAspectRatio->transformRect(destRect, srcRect);
    114     }
    115 
    116     destRect.intersect(requestedRect);
    117     addAbsolutePaintRect(destRect);
    118     return destRect;
    119 }
    120 
    121 RenderObject* FEImage::referencedRenderer() const
    122 {
    123     if (!m_treeScope)
    124         return 0;
    125     Element* hrefElement = SVGURIReference::targetElementFromIRIString(m_href, *m_treeScope);
    126     if (!hrefElement || !hrefElement->isSVGElement())
    127         return 0;
    128     return hrefElement->renderer();
    129 }
    130 
    131 void FEImage::applySoftware()
    132 {
    133     RenderObject* renderer = referencedRenderer();
    134     if (!m_image && !renderer)
    135         return;
    136 
    137     ImageBuffer* resultImage = createImageBufferResult();
    138     if (!resultImage)
    139         return;
    140     IntPoint paintLocation = absolutePaintRect().location();
    141     resultImage->context()->translate(-paintLocation.x(), -paintLocation.y());
    142 
    143     // FEImage results are always in ColorSpaceDeviceRGB
    144     setResultColorSpace(ColorSpaceDeviceRGB);
    145 
    146     FloatRect destRect = filter()->mapLocalRectToAbsoluteRect(filterPrimitiveSubregion());
    147     FloatRect srcRect;
    148 
    149     if (!renderer) {
    150         srcRect = FloatRect(FloatPoint(), m_image->size());
    151         m_preserveAspectRatio->transformRect(destRect, srcRect);
    152 
    153         resultImage->context()->drawImage(m_image.get(), destRect, srcRect);
    154         return;
    155     }
    156 
    157     SVGElement* contextNode = toSVGElement(renderer->node());
    158     if (contextNode->hasRelativeLengths()) {
    159         // FIXME: This fixes relative lengths but breaks non-relative ones (see crbug/260709).
    160         SVGLengthContext lengthContext(contextNode);
    161         FloatSize viewportSize;
    162 
    163         // If we're referencing an element with percentage units, eg. <rect with="30%"> those values were resolved against the viewport.
    164         // Build up a transformation that maps from the viewport space to the filter primitive subregion.
    165         if (lengthContext.determineViewport(viewportSize))
    166             resultImage->context()->concatCTM(makeMapBetweenRects(FloatRect(FloatPoint(), viewportSize), destRect));
    167     } else {
    168         resultImage->context()->translate(destRect.x(), destRect.y());
    169         resultImage->context()->concatCTM(filter()->absoluteTransform());
    170     }
    171 
    172     AffineTransform contentTransformation;
    173     SVGRenderingContext::renderSubtree(resultImage->context(), renderer, contentTransformation);
    174 }
    175 
    176 TextStream& FEImage::externalRepresentation(TextStream& ts, int indent) const
    177 {
    178     IntSize imageSize;
    179     if (m_image)
    180         imageSize = m_image->size();
    181     else if (RenderObject* renderer = referencedRenderer())
    182         imageSize = enclosingIntRect(getRendererRepaintRect(renderer)).size();
    183     writeIndent(ts, indent);
    184     ts << "[feImage";
    185     FilterEffect::externalRepresentation(ts);
    186     ts << " image-size=\"" << imageSize.width() << "x" << imageSize.height() << "\"]\n";
    187     // FIXME: should this dump also object returned by SVGFEImage::image() ?
    188     return ts;
    189 }
    190 
    191 PassRefPtr<SkImageFilter> FEImage::createImageFilterForRenderer(RenderObject* renderer, SkiaImageFilterBuilder* builder)
    192 {
    193     FloatRect dstRect = filterPrimitiveSubregion();
    194 
    195     AffineTransform transform;
    196     SVGElement* contextNode = toSVGElement(renderer->node());
    197 
    198     if (contextNode->hasRelativeLengths()) {
    199         SVGLengthContext lengthContext(contextNode);
    200         FloatSize viewportSize;
    201 
    202         // If we're referencing an element with percentage units, eg. <rect with="30%"> those values were resolved against the viewport.
    203         // Build up a transformation that maps from the viewport space to the filter primitive subregion.
    204         if (lengthContext.determineViewport(viewportSize))
    205             transform = makeMapBetweenRects(FloatRect(FloatPoint(), viewportSize), dstRect);
    206     } else {
    207         transform.translate(dstRect.x(), dstRect.y());
    208     }
    209 
    210     GraphicsContext* context = builder->context();
    211     if (!context)
    212         return adoptRef(SkBitmapSource::Create(SkBitmap()));
    213     AffineTransform contentTransformation;
    214     FloatRect bounds(FloatPoint(), dstRect.size());
    215     context->save();
    216     context->beginRecording(bounds);
    217     context->concatCTM(transform);
    218     SVGRenderingContext::renderSubtree(context, renderer, contentTransformation);
    219     RefPtr<DisplayList> displayList = context->endRecording();
    220     context->restore();
    221     RefPtr<SkImageFilter> result = adoptRef(SkPictureImageFilter::Create(displayList->picture(), dstRect));
    222     return result.release();
    223 }
    224 
    225 PassRefPtr<SkImageFilter> FEImage::createImageFilter(SkiaImageFilterBuilder* builder)
    226 {
    227     RenderObject* renderer = referencedRenderer();
    228     if (!m_image && !renderer)
    229         return adoptRef(SkBitmapSource::Create(SkBitmap()));
    230 
    231     setOperatingColorSpace(ColorSpaceDeviceRGB);
    232 
    233     if (renderer)
    234         return createImageFilterForRenderer(renderer, builder);
    235 
    236     FloatRect srcRect = FloatRect(FloatPoint(), m_image->size());
    237     FloatRect dstRect = filterPrimitiveSubregion();
    238 
    239     // FIXME: CSS image filters currently do not seem to set filter primitive
    240     // subregion correctly if unspecified. So default to srcRect size if so.
    241     if (dstRect.isEmpty())
    242         dstRect = srcRect;
    243 
    244     m_preserveAspectRatio->transformRect(dstRect, srcRect);
    245 
    246     if (!m_image->nativeImageForCurrentFrame())
    247         return adoptRef(SkBitmapSource::Create(SkBitmap()));
    248 
    249     RefPtr<SkImageFilter> result = adoptRef(SkBitmapSource::Create(m_image->nativeImageForCurrentFrame()->bitmap(), srcRect, dstRect));
    250     return result.release();
    251 }
    252 
    253 } // namespace blink
    254