graphicslayer.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"

#if USE(ACCELERATED_COMPOSITING)

#include "GraphicsLayer.h"

#include "FloatPoint.h"
#include "RotateTransformOperation.h"
#include "TextStream.h"

namespace WebCore {

void GraphicsLayer::FloatValue::set(float key, float value, const TimingFunction* timingFunction)
{
    m_key = key;
    m_value = value;
    if (timingFunction != m_timingFunction) {
        if (timingFunction)
            m_timingFunction.set(new TimingFunction(*timingFunction));
        else
            m_timingFunction.clear();
    }
}

void GraphicsLayer::TransformValue::set(float key, const TransformOperations* value, const TimingFunction* timingFunction)
{
    m_key = key;
    if (value != m_value) {
        if (value)
            m_value.set(new TransformOperations(*value));
        else
            m_value.clear();
    }
    if (timingFunction != m_timingFunction) {
        if (timingFunction)
            m_timingFunction.set(new TimingFunction(*timingFunction));
        else
            m_timingFunction.clear();
    }
}

void GraphicsLayer::FloatValueList::insert(float key, float value, const TimingFunction* timingFunction)
{
    for (size_t i = 0; i < m_values.size(); ++i) {
        FloatValue& curFloatValue = m_values[i];
        if (curFloatValue.key() == key) {
            curFloatValue.set(key, value, timingFunction);
            return;
        }
        if (curFloatValue.key() > key) {
            // insert before
            m_values.insert(i, FloatValue(key, value, timingFunction));
            return;
        }
    }
    
    // append
    m_values.append(FloatValue(key, value, timingFunction));
}

void GraphicsLayer::TransformValueList::insert(float key, const TransformOperations* value, const TimingFunction* timingFunction)
{
    for (size_t i = 0; i < m_values.size(); ++i) {
        TransformValue& curTransValue = m_values[i];
        if (curTransValue.key() == key) {
            curTransValue.set(key, value, timingFunction);
            return;
        }
        if (curTransValue.key() > key) {
            // insert before
            m_values.insert(i, TransformValue(key, value, timingFunction));
            return;
        }
    }
    
    // append
    m_values.append(TransformValue(key, value, timingFunction));
}

// An "invalid" list is one whose functions don't match, and therefore has to be animated as a Matrix
// The hasBigRotation flag will always return false if isValid is false. Otherwise hasBigRotation is 
// true if the rotation between any two keyframes is >= 180 degrees.
void GraphicsLayer::TransformValueList::makeFunctionList(FunctionList& list, bool& isValid, bool& hasBigRotation) const
{
    list.clear();
    isValid = false;
    hasBigRotation = false;
    
    if (m_values.size() < 2)
        return;
    
    // empty transforms match anything, so find the first non-empty entry as the reference
    size_t firstIndex = 0;
    for ( ; firstIndex < m_values.size(); ++firstIndex) {
        if (m_values[firstIndex].value()->operations().size() > 0)
            break;
    }
    
    if (firstIndex >= m_values.size())
        return;
        
    const TransformOperations* firstVal = m_values[firstIndex].value();
    
    // see if the keyframes are valid
    for (size_t i = firstIndex + 1; i < m_values.size(); ++i) {
        const TransformOperations* val = m_values[i].value();
        
        // a null transform matches anything
        if (val->operations().isEmpty())
            continue;
            
        if (firstVal->operations().size() != val->operations().size())
            return;
            
        for (size_t j = 0; j < firstVal->operations().size(); ++j) {
            if (!firstVal->operations().at(j)->isSameType(*val->operations().at(j)))
                return;
        }
    }

    // keyframes are valid, fill in the list
    isValid = true;
    
    double lastRotAngle = 0.0;
    double maxRotAngle = -1.0;
        
    list.resize(firstVal->operations().size());
    for (size_t j = 0; j < firstVal->operations().size(); ++j) {
        TransformOperation::OperationType type = firstVal->operations().at(j)->getOperationType();
        list[j] = type;
        
        // if this is a rotation entry, we need to see if any angle differences are >= 180 deg
        if (type == TransformOperation::ROTATE_X ||
            type == TransformOperation::ROTATE_Y ||
            type == TransformOperation::ROTATE_Z ||
            type == TransformOperation::ROTATE_3D) {
            lastRotAngle = static_cast<RotateTransformOperation*>(firstVal->operations().at(j).get())->angle();
            
            if (maxRotAngle < 0)
                maxRotAngle = fabs(lastRotAngle);
            
            for (size_t i = firstIndex + 1; i < m_values.size(); ++i) {
                const TransformOperations* val = m_values[i].value();
                double rotAngle = val->operations().isEmpty() ? 0 : (static_cast<RotateTransformOperation*>(val->operations().at(j).get())->angle());
                double diffAngle = fabs(rotAngle - lastRotAngle);
                if (diffAngle > maxRotAngle)
                    maxRotAngle = diffAngle;
                lastRotAngle = rotAngle;
            }
        }
    }
    
    hasBigRotation = maxRotAngle >= 180.0;
}

GraphicsLayer::GraphicsLayer(GraphicsLayerClient* client)
    : m_client(client)
    , m_anchorPoint(0.5f, 0.5f, 0)
    , m_opacity(1)
#ifndef NDEBUG
    , m_zPosition(0)
#endif
    , m_backgroundColorSet(false)
    , m_contentsOpaque(false)
    , m_preserves3D(false)
    , m_backfaceVisibility(true)
    , m_usingTiledLayer(false)
    , m_masksToBounds(false)
    , m_drawsContent(false)
    , m_paintingPhase(GraphicsLayerPaintAllMask)
    , m_parent(0)
#ifndef NDEBUG
    , m_repaintCount(0)
#endif
{
}

GraphicsLayer::~GraphicsLayer()
{
    removeAllAnimations();    

    removeAllChildren();
    removeFromParent();
}

void GraphicsLayer::addChild(GraphicsLayer* childLayer)
{
    ASSERT(childLayer != this);
    
    if (childLayer->parent())
        childLayer->removeFromParent();

    childLayer->setParent(this);
    m_children.append(childLayer);
}

void GraphicsLayer::addChildAtIndex(GraphicsLayer* childLayer, int index)
{
    ASSERT(childLayer != this);

    if (childLayer->parent())
        childLayer->removeFromParent();

    childLayer->setParent(this);
    m_children.insert(index, childLayer);
}

void GraphicsLayer::addChildBelow(GraphicsLayer* childLayer, GraphicsLayer* sibling)
{
    ASSERT(childLayer != this);
    childLayer->removeFromParent();

    bool found = false;
    for (unsigned i = 0; i < m_children.size(); i++) {
        if (sibling == m_children[i]) {
            m_children.insert(i, childLayer);
            found = true;
            break;
        }
    }

    childLayer->setParent(this);

    if (!found)
        m_children.append(childLayer);
}

void GraphicsLayer::addChildAbove(GraphicsLayer* childLayer, GraphicsLayer* sibling)
{
    childLayer->removeFromParent();
    ASSERT(childLayer != this);

    bool found = false;
    for (unsigned i = 0; i < m_children.size(); i++) {
        if (sibling == m_children[i]) {
            m_children.insert(i+1, childLayer);
            found = true;
            break;
        }
    }

    childLayer->setParent(this);

    if (!found)
        m_children.append(childLayer);
}

bool GraphicsLayer::replaceChild(GraphicsLayer* oldChild, GraphicsLayer* newChild)