src/third_party/WebKit/Source/core/svg/graphics/filters/SVGFEImage.cpp

   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  * 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->repaintRectInLocalCoordinates());
  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