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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 "SkTileImageFilter.h"
     26 
     27 #include "platform/graphics/GraphicsContext.h"
     28 #include "platform/graphics/Pattern.h"
     29 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
     30 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
     31 #include "platform/text/TextStream.h"
     32 #include "platform/transforms/AffineTransform.h"
     33 #include "third_party/skia/include/core/SkDevice.h"
     34 
     35 namespace blink {
     36 
     37 FETile::FETile(Filter* filter)
     38     : FilterEffect(filter)
     39 {
     40 }
     41 
     42 PassRefPtr<FETile> FETile::create(Filter* filter)
     43 {
     44     return adoptRef(new FETile(filter));
     45 }
     46 
     47 FloatRect FETile::mapPaintRect(const FloatRect& rect, bool forward)
     48 {
     49     return forward ? maxEffectRect() : inputEffect(0)->maxEffectRect();
     50 }
     51 
     52 void FETile::applySoftware()
     53 {
     54     FilterEffect* in = inputEffect(0);
     55 
     56     ImageBuffer* resultImage = createImageBufferResult();
     57     if (!resultImage)
     58         return;
     59 
     60     setIsAlphaImage(in->isAlphaImage());
     61 
     62     // Source input needs more attention. It has the size of the filterRegion but gives the
     63     // size of the cutted sourceImage back. This is part of the specification and optimization.
     64     FloatRect tileRect = in->maxEffectRect();
     65     FloatPoint inMaxEffectLocation = tileRect.location();
     66     FloatPoint maxEffectLocation = maxEffectRect().location();
     67     if (in->filterEffectType() == FilterEffectTypeSourceInput) {
     68         Filter* filter = this->filter();
     69         tileRect = filter->absoluteFilterRegion();
     70     }
     71 
     72     OwnPtr<ImageBufferSurface> surface;
     73     IntSize intTileSize = roundedIntSize(tileRect.size());
     74     surface = adoptPtr(new UnacceleratedImageBufferSurface(intTileSize));
     75     OwnPtr<ImageBuffer> tileImage = ImageBuffer::create(surface.release());
     76     if (!tileImage)
     77         return;
     78 
     79     GraphicsContext* tileImageContext = tileImage->context();
     80     tileImageContext->scale(intTileSize.width() / tileRect.width(), intTileSize.height() / tileRect.height());
     81     tileImageContext->translate(-inMaxEffectLocation.x(), -inMaxEffectLocation.y());
     82 
     83     if (ImageBuffer* tileImageBuffer = in->asImageBuffer())
     84         tileImageContext->drawImageBuffer(tileImageBuffer, IntRect(in->absolutePaintRect().location(), tileImageBuffer->size()));
     85 
     86     RefPtr<Pattern> pattern = Pattern::createBitmapPattern(tileImage->copyImage(CopyBackingStore));
     87 
     88     AffineTransform patternTransform;
     89     patternTransform.translate(inMaxEffectLocation.x() - maxEffectLocation.x(), inMaxEffectLocation.y() - maxEffectLocation.y());
     90     pattern->setPatternSpaceTransform(patternTransform);
     91     GraphicsContext* filterContext = resultImage->context();
     92     filterContext->setFillPattern(pattern);
     93     filterContext->fillRect(FloatRect(FloatPoint(), absolutePaintRect().size()));
     94 }
     95 
     96 static FloatRect getRect(FilterEffect* effect)
     97 {
     98     FloatRect result = effect->filter()->filterRegion();
     99     FloatRect boundaries = effect->effectBoundaries();
    100     if (effect->hasX())
    101         result.setX(boundaries.x());
    102     if (effect->hasY())
    103         result.setY(boundaries.y());
    104     if (effect->hasWidth())
    105         result.setWidth(boundaries.width());
    106     if (effect->hasHeight())
    107         result.setHeight(boundaries.height());
    108     return result;
    109 }
    110 
    111 PassRefPtr<SkImageFilter> FETile::createImageFilter(SkiaImageFilterBuilder* builder)
    112 {
    113     RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
    114     FloatRect srcRect = inputEffect(0) ? getRect(inputEffect(0)) : filter()->filterRegion();
    115     FloatRect dstRect = getRect(this);
    116     return adoptRef(SkTileImageFilter::Create(srcRect, dstRect, input.get()));
    117 }
    118 
    119 TextStream& FETile::externalRepresentation(TextStream& ts, int indent) const
    120 {
    121     writeIndent(ts, indent);
    122     ts << "[feTile";
    123     FilterEffect::externalRepresentation(ts);
    124     ts << "]\n";
    125     inputEffect(0)->externalRepresentation(ts, indent + 1);
    126 
    127     return ts;
    128 }
    129 
    130 } // namespace blink
    131