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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 "core/css/CSSCanvasValue.h"
     28 
     29 #include "core/rendering/RenderObject.h"
     30 #include "wtf/text/StringBuilder.h"
     31 
     32 namespace WebCore {
     33 
     34 CSSCanvasValue::~CSSCanvasValue()
     35 {
     36     if (m_element)
     37         m_element->removeObserver(&m_canvasObserver);
     38 }
     39 
     40 String CSSCanvasValue::customCssText() const
     41 {
     42     StringBuilder result;
     43     result.appendLiteral("-webkit-canvas(");
     44     result.append(m_name);
     45     result.append(')');
     46     return result.toString();
     47 }
     48 
     49 void CSSCanvasValue::canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect)
     50 {
     51     IntRect imageChangeRect = enclosingIntRect(changedRect);
     52     RenderObjectSizeCountMap::const_iterator end = clients().end();
     53     for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
     54         const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this), &imageChangeRect);
     55 }
     56 
     57 void CSSCanvasValue::canvasResized(HTMLCanvasElement*)
     58 {
     59     RenderObjectSizeCountMap::const_iterator end = clients().end();
     60     for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
     61         const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this));
     62 }
     63 
     64 void CSSCanvasValue::canvasDestroyed(HTMLCanvasElement* element)
     65 {
     66     ASSERT_UNUSED(element, element == m_element);
     67     m_element = 0;
     68 }
     69 
     70 IntSize CSSCanvasValue::fixedSize(const RenderObject* renderer)
     71 {
     72     if (HTMLCanvasElement* elt = element(renderer->document()))
     73         return IntSize(elt->width(), elt->height());
     74     return IntSize();
     75 }
     76 
     77 HTMLCanvasElement* CSSCanvasValue::element(Document* document)
     78 {
     79      if (!m_element) {
     80         m_element = document->getCSSCanvasElement(m_name);
     81         if (!m_element)
     82             return 0;
     83         m_element->addObserver(&m_canvasObserver);
     84     }
     85     return m_element;
     86 }
     87 
     88 PassRefPtr<Image> CSSCanvasValue::image(RenderObject* renderer, const IntSize& /*size*/)
     89 {
     90     ASSERT(clients().contains(renderer));
     91     HTMLCanvasElement* elt = element(renderer->document());
     92     if (!elt || !elt->buffer())
     93         return 0;
     94     return elt->copiedImage();
     95 }
     96 
     97 bool CSSCanvasValue::equals(const CSSCanvasValue& other) const
     98 {
     99     return m_name == other.m_name;
    100 }
    101 
    102 } // namespace WebCore
    103