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