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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  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #include "config.h"
     22 
     23 #if ENABLE(FILTERS)
     24 #include "FETile.h"
     25 
     26 #include "AffineTransform.h"
     27 #include "Filter.h"
     28 #include "GraphicsContext.h"
     29 #include "Pattern.h"
     30 #include "RenderTreeAsText.h"
     31 #include "SVGImageBufferTools.h"
     32 #include "TextStream.h"
     33 
     34 namespace WebCore {
     35 
     36 FETile::FETile(Filter* filter)
     37     : FilterEffect(filter)
     38 {
     39 }
     40 
     41 PassRefPtr<FETile> FETile::create(Filter* filter)
     42 {
     43     return adoptRef(new FETile(filter));
     44 }
     45 
     46 void FETile::apply()
     47 {
     48 // FIXME: See bug 47315. This is a hack to work around a compile failure, but is incorrect behavior otherwise.
     49 #if ENABLE(SVG)
     50     if (hasResult())
     51         return;
     52     FilterEffect* in = inputEffect(0);
     53     in->apply();
     54     if (!in->hasResult())
     55         return;
     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->filterRegion();
     71         tileRect.scale(filter->filterResolution().width(), filter->filterResolution().height());
     72     }
     73 
     74     OwnPtr<ImageBuffer> tileImage;
     75     if (!SVGImageBufferTools::createImageBuffer(tileRect, tileRect, tileImage, ColorSpaceDeviceRGB))
     76         return;
     77 
     78     GraphicsContext* tileImageContext = tileImage->context();
     79     tileImageContext->translate(-inMaxEffectLocation.x(), -inMaxEffectLocation.y());
     80     tileImageContext->drawImageBuffer(in->asImageBuffer(), ColorSpaceDeviceRGB, in->absolutePaintRect().location());
     81 
     82     RefPtr<Pattern> pattern = Pattern::create(tileImage->copyImage(), true, true);
     83 
     84     AffineTransform patternTransform;
     85     patternTransform.translate(inMaxEffectLocation.x() - maxEffectLocation.x(), inMaxEffectLocation.y() - maxEffectLocation.y());
     86     pattern->setPatternSpaceTransform(patternTransform);
     87     GraphicsContext* filterContext = resultImage->context();
     88     filterContext->setFillPattern(pattern);
     89     filterContext->fillRect(FloatRect(FloatPoint(), absolutePaintRect().size()));
     90 #endif
     91 }
     92 
     93 void FETile::dump()
     94 {
     95 }
     96 
     97 TextStream& FETile::externalRepresentation(TextStream& ts, int indent) const
     98 {
     99     writeIndent(ts, indent);
    100     ts << "[feTile";
    101     FilterEffect::externalRepresentation(ts);
    102     ts << "]\n";
    103     inputEffect(0)->externalRepresentation(ts, indent + 1);
    104 
    105     return ts;
    106 }
    107 
    108 } // namespace WebCore
    109 
    110 #endif // ENABLE(FILTERS)
    111