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      1 /*
      2  * Copyright (C) 2008, 2009, 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "GeneratedImage.h"
     28 
     29 #include "FloatRect.h"
     30 #include "GraphicsContext.h"
     31 #include "ImageBuffer.h"
     32 
     33 using namespace std;
     34 
     35 namespace WebCore {
     36 
     37 void GeneratedImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace, CompositeOperator compositeOp)
     38 {
     39     context->save();
     40     context->setCompositeOperation(compositeOp);
     41     context->clip(dstRect);
     42     context->translate(dstRect.x(), dstRect.y());
     43     if (dstRect.size() != srcRect.size())
     44         context->scale(FloatSize(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height()));
     45     context->translate(-srcRect.x(), -srcRect.y());
     46     context->fillRect(FloatRect(FloatPoint(), m_size), *m_generator.get());
     47     context->restore();
     48 }
     49 
     50 void GeneratedImage::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const AffineTransform& patternTransform,
     51                                  const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator compositeOp, const FloatRect& destRect)
     52 {
     53     // Allow the generator to provide visually-equivalent tiling parameters for better performance.
     54     IntSize adjustedSize = m_size;
     55     FloatRect adjustedSrcRect = srcRect;
     56     m_generator->adjustParametersForTiledDrawing(adjustedSize, adjustedSrcRect);
     57 
     58     // Create a BitmapImage and call drawPattern on it.
     59     OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(adjustedSize);
     60     if (!imageBuffer)
     61         return;
     62 
     63     // Fill with the gradient.
     64     GraphicsContext* graphicsContext = imageBuffer->context();
     65     graphicsContext->fillRect(FloatRect(FloatPoint(), adjustedSize), *m_generator.get());
     66 
     67     // Tile the image buffer into the context.
     68     imageBuffer->drawPattern(context, adjustedSrcRect, patternTransform, phase, styleColorSpace, compositeOp, destRect);
     69 }
     70 
     71 }
     72