WebCore/css/CSSImageGeneratorValue.cpp

   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         removeClient(renderer);
  90         addClient(renderer, size);
  91     }
  92
  93     // Don't generate an image for empty sizes.
  94     if (size.isEmpty())
  95         return 0;
  96
  97     // Look up the image in our cache.
  98     return m_images.get(size).get();
  99 }
 100
 101 void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)
 102 {
 103     m_images.add(size, image);
 104 }
 105
 106 StyleGeneratedImage* CSSImageGeneratorValue::generatedImage()
 107 {
 108     if (!m_accessedImage) {
 109         m_accessedImage = true;
 110         m_image = StyleGeneratedImage::create(this, isFixedSize());
 111     }
 112     return m_image.get();
 113 }
 114
 115 } // namespace WebCore