third_party/WebKit/Source/core/layout/LayoutHTMLCanvas.cpp

   1 /*
   2  * Copyright (C) 2004, 2006, 2007 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/layout/LayoutHTMLCanvas.h"
  28
  29 #include "core/frame/FrameView.h"
  30 #include "core/frame/LocalFrame.h"
  31 #include "core/html/HTMLCanvasElement.h"
  32 #include "core/layout/LayoutView.h"
  33 #include "core/page/Page.h"
  34 #include "core/paint/HTMLCanvasPainter.h"
  35
  36 namespace blink {
  37
  38 using namespace HTMLNames;
  39
  40 LayoutHTMLCanvas::LayoutHTMLCanvas(HTMLCanvasElement* element)
  41     : LayoutReplaced(element, LayoutSize(element->size()))
  42 {
  43     view()->frameView()->setIsVisuallyNonEmpty();
  44 }
  45
  46 DeprecatedPaintLayerType LayoutHTMLCanvas::layerTypeRequired() const
  47 {
  48     return NormalDeprecatedPaintLayer;
  49 }
  50
  51 void LayoutHTMLCanvas::paintReplaced(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
  52 {
  53     HTMLCanvasPainter(*this).paintReplaced(paintInfo, paintOffset);
  54 }
  55
  56 void LayoutHTMLCanvas::canvasSizeChanged()
  57 {
  58     IntSize canvasSize = toHTMLCanvasElement(node())->size();
  59     LayoutSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
  60
  61     if (zoomedSize == intrinsicSize())
  62         return;
  63
  64     setIntrinsicSize(zoomedSize);
  65
  66     if (!parent())
  67         return;
  68
  69     if (!preferredLogicalWidthsDirty())
  70         setPreferredLogicalWidthsDirty();
  71
  72     LayoutSize oldSize = size();
  73     updateLogicalWidth();
  74     updateLogicalHeight();
  75     if (oldSize == size())
  76         return;
  77
  78     if (!selfNeedsLayout())
  79         setNeedsLayout(LayoutInvalidationReason::SizeChanged);
  80 }
  81
  82 PaintInvalidationReason LayoutHTMLCanvas::invalidatePaintIfNeeded(PaintInvalidationState& paintInvalidationState, const LayoutBoxModelObject& paintInvalidationContainer)
  83 {
  84     PaintInvalidationReason reason = LayoutBox::invalidatePaintIfNeeded(paintInvalidationState, paintInvalidationContainer);
  85     HTMLCanvasElement* element = toHTMLCanvasElement(node());
  86     if (element->isDirty()) {
  87         element->doDeferredPaintInvalidation();
  88         if (reason < PaintInvalidationRectangle)
  89             reason = PaintInvalidationRectangle;
  90     }
  91     return reason;
  92 }
  93
  94 CompositingReasons LayoutHTMLCanvas::additionalCompositingReasons() const
  95 {
  96     if (toHTMLCanvasElement(node())->shouldBeDirectComposited())
  97         return CompositingReasonCanvas;
  98     return CompositingReasonNone;
  99 }
 100
 101 void LayoutHTMLCanvas::styleDidChange(StyleDifference diff, const ComputedStyle* oldStyle)
 102 {
 103     LayoutReplaced::styleDidChange(diff, oldStyle);
 104     toHTMLCanvasElement(node())->styleDidChange(oldStyle, styleRef());
 105 }
 106
 107 } // namespace blink