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