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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 blink {
     33 
     34 CSSCanvasValue::~CSSCanvasValue()
     35 {
     36 #if !ENABLE(OILPAN)
     37     if (m_element)
     38         m_element->removeObserver(m_canvasObserver.get());
     39 #endif
     40 }
     41 
     42 String CSSCanvasValue::customCSSText() const
     43 {
     44     StringBuilder result;
     45     result.appendLiteral("-webkit-canvas(");
     46     result.append(m_name);
     47     result.append(')');
     48     return result.toString();
     49 }
     50 
     51 void CSSCanvasValue::canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect)
     52 {
     53     IntRect imageChangeRect = enclosingIntRect(changedRect);
     54     RenderObjectSizeCountMap::const_iterator end = clients().end();
     55     for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
     56         const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this), &imageChangeRect);
     57 }
     58 
     59 void CSSCanvasValue::canvasResized(HTMLCanvasElement*)
     60 {
     61     RenderObjectSizeCountMap::const_iterator end = clients().end();
     62     for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
     63         const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this));
     64 }
     65 
     66 #if !ENABLE(OILPAN)
     67 void CSSCanvasValue::canvasDestroyed(HTMLCanvasElement* element)
     68 {
     69     ASSERT_UNUSED(element, element == m_element);
     70     m_element = nullptr;
     71 }
     72 #endif
     73 
     74 IntSize CSSCanvasValue::fixedSize(const RenderObject* renderer)
     75 {
     76     if (HTMLCanvasElement* elt = element(&renderer->document()))
     77         return IntSize(elt->width(), elt->height());
     78     return IntSize();
     79 }
     80 
     81 HTMLCanvasElement* CSSCanvasValue::element(Document* document)
     82 {
     83      if (!m_element) {
     84         m_element = &document->getCSSCanvasElement(m_name);
     85         m_element->addObserver(m_canvasObserver.get());
     86     }
     87     return m_element;
     88 }
     89 
     90 PassRefPtr<Image> CSSCanvasValue::image(RenderObject* renderer, const IntSize& /*size*/)
     91 {
     92     ASSERT(clients().contains(renderer));
     93     HTMLCanvasElement* elt = element(&renderer->document());
     94     if (!elt || !elt->buffer())
     95         return nullptr;
     96     return elt->copiedImage();
     97 }
     98 
     99 bool CSSCanvasValue::equals(const CSSCanvasValue& other) const
    100 {
    101     return m_name == other.m_name;
    102 }
    103 
    104 void CSSCanvasValue::traceAfterDispatch(Visitor* visitor)
    105 {
    106     visitor->trace(m_canvasObserver);
    107     visitor->trace(m_element);
    108     CSSImageGeneratorValue::traceAfterDispatch(visitor);
    109 }
    110 
    111 } // namespace blink
    112