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      1 /*
      2  * Copyright (C) 2008 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 COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "CSSImageGeneratorValue.h"
     28 
     29 #include "Image.h"
     30 #include "IntSize.h"
     31 #include "IntSizeHash.h"
     32 #include "PlatformString.h"
     33 #include "RenderObject.h"
     34 #include "StyleGeneratedImage.h"
     35 
     36 namespace WebCore {
     37 
     38 CSSImageGeneratorValue::CSSImageGeneratorValue()
     39 : m_accessedImage(false)
     40 {
     41 }
     42 
     43 CSSImageGeneratorValue::~CSSImageGeneratorValue()
     44 {
     45 }
     46 
     47 void CSSImageGeneratorValue::addClient(RenderObject* renderer, const IntSize& size)
     48 {
     49     ref();
     50     if (!size.isEmpty())
     51         m_sizes.add(size);
     52 
     53     RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);
     54     if (it == m_clients.end())
     55         m_clients.add(renderer, SizeCountPair(size, 1));
     56     else {
     57         SizeCountPair& sizeCount = it->second;
     58         ++sizeCount.second;
     59     }
     60 }
     61 
     62 void CSSImageGeneratorValue::removeClient(RenderObject* renderer)
     63 {
     64     RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);
     65     ASSERT(it != m_clients.end());
     66 
     67     SizeCountPair& sizeCount = it->second;
     68     IntSize size = sizeCount.first;
     69     if (!size.isEmpty()) {
     70         m_sizes.remove(size);
     71         if (!m_sizes.contains(size))
     72             m_images.remove(size);
     73     }
     74 
     75     if (!--sizeCount.second)
     76         m_clients.remove(renderer);
     77 
     78     deref();
     79 }
     80 
     81 Image* CSSImageGeneratorValue::getImage(RenderObject* renderer, const IntSize& size)
     82 {
     83     RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);
     84     ASSERT(it != m_clients.end());
     85 
     86     SizeCountPair& sizeCount = it->second;
     87     IntSize oldSize = sizeCount.first;
     88     if (oldSize != size) {
     89         // If renderer is the only client, make sure we don't delete this.
     90         RefPtr<CSSImageGeneratorValue> protect(this);
     91         removeClient(renderer);
     92         addClient(renderer, size);
     93     }
     94 
     95     // Don't generate an image for empty sizes.
     96     if (size.isEmpty())
     97         return 0;
     98 
     99     // Look up the image in our cache.
    100     return m_images.get(size).get();
    101 }
    102 
    103 void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)
    104 {
    105     m_images.add(size, image);
    106 }
    107 
    108 StyleGeneratedImage* CSSImageGeneratorValue::generatedImage()
    109 {
    110     if (!m_accessedImage) {
    111         m_accessedImage = true;
    112         m_image = StyleGeneratedImage::create(this, isFixedSize());
    113     }
    114     return m_image.get();
    115 }
    116 
    117 } // namespace WebCore
    118