Source/platform/graphics/filters/custom/CustomFilterParameterList.cpp

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDER "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 THE COPYRIGHT HOLDER 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
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#include "config.h"
#include "platform/graphics/filters/custom/CustomFilterParameterList.h"

#include "platform/graphics/filters/custom/CustomFilterParameter.h"
#include "wtf/text/StringHash.h"

namespace WebCore {

CustomFilterParameterList::CustomFilterParameterList()
{
}

CustomFilterParameterList::CustomFilterParameterList(size_t size)
    : m_parameters(size)
{
}

bool CustomFilterParameterList::operator==(const CustomFilterParameterList& other) const
{
    if (size() != other.size())
        return false;
    for (size_t i = 0; i < size(); ++i) {
        if (at(i).get() != other.at(i).get()
            && *at(i).get() != *other.at(i).get())
            return false;
    }
    return true;
}

#ifndef NDEBUG
bool CustomFilterParameterList::checkAlphabeticalOrder() const
{
    for (unsigned i = 1; i < size(); ++i) {
        // Break for equal or not-sorted parameters.
        if (!codePointCompareLessThan(at(i - 1)->name(), at(i)->name()))
            return false;
    }
    return true;
}
#endif

void CustomFilterParameterList::blend(const CustomFilterParameterList& fromList,
    double progress, CustomFilterParameterList& resultList) const
{
#ifndef NDEBUG
    // This method expects both lists to be sorted by parameter name and the result list is also sorted.
    ASSERT(checkAlphabeticalOrder());
    ASSERT(fromList.checkAlphabeticalOrder());
#endif
    size_t fromListIndex = 0, toListIndex = 0;
    while (fromListIndex < fromList.size() && toListIndex < size()) {
        CustomFilterParameter* paramFrom = fromList.at(fromListIndex).get();
        CustomFilterParameter* paramTo = at(toListIndex).get();
        if (paramFrom->name() == paramTo->name()) {
            resultList.append(paramTo->blend(paramFrom, progress));
            ++fromListIndex;
            ++toListIndex;
            continue;
        }
        if (codePointCompareLessThan(paramFrom->name(), paramTo->name())) {
            resultList.append(paramFrom);
            ++fromListIndex;
            continue;
        }
        resultList.append(paramTo);
        ++toListIndex;
    }
    for (; fromListIndex < fromList.size(); ++fromListIndex)
        resultList.append(fromList.at(fromListIndex));
    for (; toListIndex < size(); ++toListIndex)
        resultList.append(at(toListIndex));
#ifndef NDEBUG
    ASSERT(resultList.checkAlphabeticalOrder());
#endif
}

static bool sortParametersByNameComparator(const RefPtr<CustomFilterParameter>& a, const RefPtr<CustomFilterParameter>& b)
{
    return codePointCompareLessThan(a->name(), b->name());
}

void CustomFilterParameterList::sortParametersByName()
{
    std::sort(m_parameters.begin(), m_parameters.end(), sortParametersByNameComparator);
}

} // namespace WebCore