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      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
      3  *
      4  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
      5  *
      6  * Other contributors:
      7  *   Robert O'Callahan <roc+@cs.cmu.edu>
      8  *   David Baron <dbaron (at) fas.harvard.edu>
      9  *   Christian Biesinger <cbiesinger (at) web.de>
     10  *   Randall Jesup <rjesup (at) wgate.com>
     11  *   Roland Mainz <roland.mainz (at) informatik.med.uni-giessen.de>
     12  *   Josh Soref <timeless (at) mac.com>
     13  *   Boris Zbarsky <bzbarsky (at) mit.edu>
     14  *
     15  * This library is free software; you can redistribute it and/or
     16  * modify it under the terms of the GNU Lesser General Public
     17  * License as published by the Free Software Foundation; either
     18  * version 2.1 of the License, or (at your option) any later version.
     19  *
     20  * This library is distributed in the hope that it will be useful,
     21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     23  * Lesser General Public License for more details.
     24  *
     25  * You should have received a copy of the GNU Lesser General Public
     26  * License along with this library; if not, write to the Free Software
     27  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     28  *
     29  * Alternatively, the contents of this file may be used under the terms
     30  * of either the Mozilla Public License Version 1.1, found at
     31  * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
     32  * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
     33  * (the "GPL"), in which case the provisions of the MPL or the GPL are
     34  * applicable instead of those above.  If you wish to allow use of your
     35  * version of this file only under the terms of one of those two
     36  * licenses (the MPL or the GPL) and not to allow others to use your
     37  * version of this file under the LGPL, indicate your decision by
     38  * deletingthe provisions above and replace them with the notice and
     39  * other provisions required by the MPL or the GPL, as the case may be.
     40  * If you do not delete the provisions above, a recipient may use your
     41  * version of this file under any of the LGPL, the MPL or the GPL.
     42  */
     43 
     44 #include "config.h"
     45 #include "core/rendering/RenderLayerReflectionInfo.h"
     46 
     47 #include "core/frame/UseCounter.h"
     48 #include "core/rendering/RenderLayer.h"
     49 #include "core/rendering/RenderReplica.h"
     50 #include "core/rendering/style/RenderStyle.h"
     51 #include "platform/transforms/ScaleTransformOperation.h"
     52 #include "platform/transforms/TranslateTransformOperation.h"
     53 
     54 #include "wtf/RefPtr.h"
     55 
     56 namespace blink {
     57 
     58 RenderLayerReflectionInfo::RenderLayerReflectionInfo(RenderBox& renderer)
     59     : m_box(renderer)
     60     , m_isPaintingInsideReflection(false)
     61 {
     62     UseCounter::count(box().document(), UseCounter::Reflection);
     63 
     64     m_reflection = RenderReplica::createAnonymous(&box().document());
     65     m_reflection->setParent(m_box); // We create a 1-way connection.
     66 }
     67 
     68 void RenderLayerReflectionInfo::destroy()
     69 {
     70     if (!m_reflection->documentBeingDestroyed())
     71         m_reflection->removeLayers(box().layer());
     72 
     73     m_reflection->setParent(0);
     74     m_reflection->destroy();
     75     m_reflection = nullptr;
     76 }
     77 
     78 void RenderLayerReflectionInfo::trace(Visitor* visitor)
     79 {
     80     visitor->trace(m_box);
     81     visitor->trace(m_reflection);
     82 }
     83 
     84 RenderLayer* RenderLayerReflectionInfo::reflectionLayer() const
     85 {
     86     return m_reflection->layer();
     87 }
     88 
     89 void RenderLayerReflectionInfo::updateAfterStyleChange(const RenderStyle* oldStyle)
     90 {
     91     RefPtr<RenderStyle> newStyle = RenderStyle::create();
     92     newStyle->inheritFrom(box().style());
     93 
     94     // Map in our transform.
     95     TransformOperations transform;
     96     switch (box().style()->boxReflect()->direction()) {
     97     case ReflectionBelow:
     98         transform.operations().append(TranslateTransformOperation::create(Length(0, Fixed),
     99             Length(100., Percent), TransformOperation::Translate));
    100         transform.operations().append(TranslateTransformOperation::create(Length(0, Fixed),
    101             box().style()->boxReflect()->offset(), TransformOperation::Translate));
    102         transform.operations().append(ScaleTransformOperation::create(1.0, -1.0, ScaleTransformOperation::Scale));
    103         break;
    104 
    105     case ReflectionAbove:
    106         transform.operations().append(ScaleTransformOperation::create(1.0, -1.0, ScaleTransformOperation::Scale));
    107         transform.operations().append(TranslateTransformOperation::create(Length(0, Fixed),
    108             Length(100., Percent), TransformOperation::Translate));
    109         transform.operations().append(TranslateTransformOperation::create(Length(0, Fixed),
    110             box().style()->boxReflect()->offset(), TransformOperation::Translate));
    111         break;
    112 
    113     case ReflectionRight:
    114         transform.operations().append(TranslateTransformOperation::create(Length(100., Percent),
    115             Length(0, Fixed), TransformOperation::Translate));
    116         transform.operations().append(TranslateTransformOperation::create(
    117             box().style()->boxReflect()->offset(), Length(0, Fixed), TransformOperation::Translate));
    118         transform.operations().append(ScaleTransformOperation::create(-1.0, 1.0, ScaleTransformOperation::Scale));
    119         break;
    120 
    121     case ReflectionLeft:
    122         transform.operations().append(ScaleTransformOperation::create(-1.0, 1.0, ScaleTransformOperation::Scale));
    123         transform.operations().append(TranslateTransformOperation::create(Length(100., Percent),
    124             Length(0, Fixed), TransformOperation::Translate));
    125         transform.operations().append(TranslateTransformOperation::create(
    126             box().style()->boxReflect()->offset(), Length(0, Fixed), TransformOperation::Translate));
    127         break;
    128     }
    129     newStyle->setTransform(transform);
    130 
    131     // Map in our mask.
    132     newStyle->setMaskBoxImage(box().style()->boxReflect()->mask());
    133 
    134     m_reflection->setStyle(newStyle.release());
    135 }
    136 
    137 void RenderLayerReflectionInfo::paint(GraphicsContext* context, const LayerPaintingInfo& paintingInfo, PaintLayerFlags flags)
    138 {
    139     if (m_isPaintingInsideReflection)
    140         return;
    141 
    142     // Mark that we are now inside replica painting.
    143     m_isPaintingInsideReflection = true;
    144     reflectionLayer()->paintLayer(context, paintingInfo, flags);
    145     m_isPaintingInsideReflection = false;
    146 }
    147 
    148 String RenderLayerReflectionInfo::debugName() const
    149 {
    150     return box().debugName() + " (reflection)";
    151 }
    152 
    153 } // namespace blink
    154