Source/core/platform/graphics/filters/custom/CustomFilterOperation.cpp

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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#include "config.h"

#include "core/platform/graphics/filters/custom/CustomFilterOperation.h"

#include "core/platform/graphics/filters/FilterOperation.h"
#include "core/platform/graphics/filters/custom/CustomFilterParameter.h"
#include "core/platform/graphics/filters/custom/CustomFilterProgram.h"

namespace WebCore {

CustomFilterOperation::CustomFilterOperation(PassRefPtr<CustomFilterProgram> program, const CustomFilterParameterList& sortedParameters, unsigned meshRows, unsigned meshColumns, CustomFilterMeshType meshType)
    : FilterOperation(CUSTOM)
    , m_program(program)
    , m_parameters(sortedParameters)
    , m_meshRows(meshRows)
    , m_meshColumns(meshColumns)
    , m_meshType(meshType)
{
    // Make sure that the parameters are alwyas sorted by name. We use that to merge two CustomFilterOperations in animations.
    ASSERT(m_parameters.checkAlphabeticalOrder());
}

CustomFilterOperation::~CustomFilterOperation()
{
}

PassRefPtr<FilterOperation> CustomFilterOperation::blend(const FilterOperation* from, double progress, bool blendToPassthrough)
{
    // FIXME: There's no way to decide what is the "passthrough filter" for shaders using the current CSS Syntax.
    // https://bugs.webkit.org/show_bug.cgi?id=84903
    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=16861
    if (blendToPassthrough || !from || !from->isSameType(*this))
        return this;

    const CustomFilterOperation* fromOp = static_cast<const CustomFilterOperation*>(from);
    if (m_program.get() != fromOp->m_program.get()
        || m_meshRows != fromOp->m_meshRows
        || m_meshColumns != fromOp->m_meshColumns
        || m_meshType != fromOp->m_meshType)
        return this;

    CustomFilterParameterList animatedParameters;
    m_parameters.blend(fromOp->m_parameters, progress, animatedParameters);
    return CustomFilterOperation::create(m_program, animatedParameters, m_meshRows, m_meshColumns, m_meshType);
}

} // namespace WebCore