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