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      1 /*
      2  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob (at) gmail.com>
      3  * Copyright (C) 2009 Dirk Schulze <krit (at) webkit.org>
      4  * Copyright (C) 2013 Google Inc. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 #include "platform/graphics/filters/FETile.h"
     24 
     25 #include "SkFlattenableBuffers.h"
     26 #include "SkTileImageFilter.h"
     27 
     28 #include "platform/graphics/GraphicsContext.h"
     29 #include "platform/graphics/Pattern.h"
     30 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
     31 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
     32 #include "platform/text/TextStream.h"
     33 #include "platform/transforms/AffineTransform.h"
     34 #include "third_party/skia/include/core/SkDevice.h"
     35 
     36 namespace WebCore {
     37 
     38 FETile::FETile(Filter* filter)
     39     : FilterEffect(filter)
     40 {
     41 }
     42 
     43 PassRefPtr<FETile> FETile::create(Filter* filter)
     44 {
     45     return adoptRef(new FETile(filter));
     46 }
     47 
     48 FloatRect FETile::mapPaintRect(const FloatRect& rect, bool forward)
     49 {
     50     return forward ? maxEffectRect() : inputEffect(0)->maxEffectRect();
     51 }
     52 
     53 void FETile::applySoftware()
     54 {
     55     FilterEffect* in = inputEffect(0);
     56 
     57     ImageBuffer* resultImage = createImageBufferResult();
     58     if (!resultImage)
     59         return;
     60 
     61     setIsAlphaImage(in->isAlphaImage());
     62 
     63     // Source input needs more attention. It has the size of the filterRegion but gives the
     64     // size of the cutted sourceImage back. This is part of the specification and optimization.
     65     FloatRect tileRect = in->maxEffectRect();
     66     FloatPoint inMaxEffectLocation = tileRect.location();
     67     FloatPoint maxEffectLocation = maxEffectRect().location();
     68     if (in->filterEffectType() == FilterEffectTypeSourceInput) {
     69         Filter* filter = this->filter();
     70         tileRect = filter->absoluteFilterRegion();
     71     }
     72 
     73     OwnPtr<ImageBufferSurface> surface;
     74     IntSize intTileSize = roundedIntSize(tileRect.size());
     75     surface = adoptPtr(new UnacceleratedImageBufferSurface(intTileSize));
     76     OwnPtr<ImageBuffer> tileImage = ImageBuffer::create(surface.release());
     77     if (!tileImage)
     78         return;
     79 
     80     GraphicsContext* tileImageContext = tileImage->context();
     81     tileImageContext->scale(intTileSize.width() / tileRect.width(), intTileSize.height() / tileRect.height());
     82     tileImageContext->translate(-inMaxEffectLocation.x(), -inMaxEffectLocation.y());
     83 
     84     if (ImageBuffer* tileImageBuffer = in->asImageBuffer())
     85         tileImageContext->drawImageBuffer(tileImageBuffer, IntRect(in->absolutePaintRect().location(), tileImageBuffer->size()));
     86 
     87     RefPtr<Pattern> pattern = Pattern::create(tileImage->copyImage(CopyBackingStore), true, true);
     88 
     89     AffineTransform patternTransform;
     90     patternTransform.translate(inMaxEffectLocation.x() - maxEffectLocation.x(), inMaxEffectLocation.y() - maxEffectLocation.y());
     91     pattern->setPatternSpaceTransform(patternTransform);
     92     GraphicsContext* filterContext = resultImage->context();
     93     filterContext->setFillPattern(pattern);
     94     filterContext->fillRect(FloatRect(FloatPoint(), absolutePaintRect().size()));
     95 }
     96 
     97 static FloatRect getRect(FilterEffect* effect)
     98 {
     99     FloatRect result = effect->filter()->filterRegion();
    100     FloatRect boundaries = effect->effectBoundaries();
    101     if (effect->hasX())
    102         result.setX(boundaries.x());
    103     if (effect->hasY())
    104         result.setY(boundaries.y());
    105     if (effect->hasWidth())
    106         result.setWidth(boundaries.width());
    107     if (effect->hasHeight())
    108         result.setHeight(boundaries.height());
    109     return result;
    110 }
    111 
    112 PassRefPtr<SkImageFilter> FETile::createImageFilter(SkiaImageFilterBuilder* builder)
    113 {
    114     RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
    115     FloatRect srcRect = inputEffect(0) ? getRect(inputEffect(0)) : filter()->filterRegion();
    116     FloatRect dstRect = getRect(this);
    117     return adoptRef(SkTileImageFilter::Create(srcRect, dstRect, input.get()));
    118 }
    119 
    120 TextStream& FETile::externalRepresentation(TextStream& ts, int indent) const
    121 {
    122     writeIndent(ts, indent);
    123     ts << "[feTile";
    124     FilterEffect::externalRepresentation(ts);
    125     ts << "]\n";
    126     inputEffect(0)->externalRepresentation(ts, indent + 1);
    127 
    128     return ts;
    129 }
    130 
    131 } // namespace WebCore
    132