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/*
* Copyright (C) 2011-2019 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 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.
*/
#pragma once
#include "CompositeOperation.h"
#include "IntPoint.h"
#include "IterationCompositeOperation.h"
#include "LayoutPoint.h"
namespace WebCore {
struct BlendingContext {
double progress { 0 };
bool isDiscrete { false };
CompositeOperation compositeOperation { CompositeOperation::Replace };
IterationCompositeOperation iterationCompositeOperation { IterationCompositeOperation::Replace };
double currentIteration { 0 };
BlendingContext(double progress = 0, bool isDiscrete = false, CompositeOperation compositeOperation = CompositeOperation::Replace, IterationCompositeOperation iterationCompositeOperation = IterationCompositeOperation::Replace, double currentIteration = 0)
: progress(progress)
, isDiscrete(isDiscrete)
, compositeOperation(compositeOperation)
, iterationCompositeOperation(iterationCompositeOperation)
, currentIteration(currentIteration)
{
}
bool isReplace() const
{
return compositeOperation == CompositeOperation::Replace && iterationCompositeOperation == IterationCompositeOperation::Replace;
}
void normalizeProgress()
{
// https://drafts.csswg.org/web-animations-1/#discrete
// The property's values cannot be meaningfully combined, thus it is not additive and
// interpolation swaps from Va to Vb at 50% (p=0.5).
if (isDiscrete) {
progress = progress < 0.5 ? 0 : 1;
compositeOperation = CompositeOperation::Replace;
}
}
};
inline int blend(int from, int to, const BlendingContext& context)
{
if (context.iterationCompositeOperation == IterationCompositeOperation::Accumulate && context.currentIteration) {
auto iterationIncrement = static_cast<int>(context.currentIteration * static_cast<double>(to));
from += iterationIncrement;
to += iterationIncrement;
}
if (context.compositeOperation == CompositeOperation::Replace)
return static_cast<int>(roundTowardsPositiveInfinity(from + (static_cast<double>(to) - from) * context.progress));
return static_cast<int>(roundTowardsPositiveInfinity(static_cast<double>(from) + static_cast<double>(from) + static_cast<double>(to - from) * context.progress));
}
inline unsigned blend(unsigned from, unsigned to, const BlendingContext& context)
{
if (context.iterationCompositeOperation == IterationCompositeOperation::Accumulate && context.currentIteration) {
auto iterationIncrement = static_cast<unsigned>(context.currentIteration * static_cast<double>(to));
from += iterationIncrement;
to += iterationIncrement;
}
if (context.compositeOperation == CompositeOperation::Replace)
return static_cast<unsigned>(lround(from + (static_cast<double>(to) - from) * context.progress));
return static_cast<unsigned>(lround(from + from + (static_cast<double>(to) - from) * context.progress));
}
inline double blend(double from, double to, const BlendingContext& context)
{
if (context.iterationCompositeOperation == IterationCompositeOperation::Accumulate && context.currentIteration) {
auto iterationIncrement = context.currentIteration * to;
from += iterationIncrement;
to += iterationIncrement;
}
if (context.compositeOperation == CompositeOperation::Replace)
return from + (to - from) * context.progress;
return from + from + (to - from) * context.progress;
}
inline float blend(float from, float to, const BlendingContext& context)
{
if (context.iterationCompositeOperation == IterationCompositeOperation::Accumulate && context.currentIteration) {
auto iterationIncrement = static_cast<float>(context.currentIteration * to);
from += iterationIncrement;
to += iterationIncrement;
}
if (context.compositeOperation == CompositeOperation::Replace)
return static_cast<float>(from + (to - from) * context.progress);
return static_cast<float>(from + from + (to - from) * context.progress);
}
inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, const BlendingContext& context)
{
return LayoutUnit(blend(from.toFloat(), to.toFloat(), context));
}
inline IntPoint blend(const IntPoint& from, const IntPoint& to, const BlendingContext& context)
{
return IntPoint(blend(from.x(), to.x(), context),
blend(from.y(), to.y(), context));
}
inline LayoutPoint blend(const LayoutPoint& from, const LayoutPoint& to, const BlendingContext& context)
{
return LayoutPoint(blend(from.x(), to.x(), context),
blend(from.y(), to.y(), context));
}
} // namespace WebCore
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