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/*
* Copyright (C) 2025 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.
*/
#include "config.h"
#include "PlatformDynamicRangeLimit.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
float PlatformDynamicRangeLimit::normalizedAverage(float standardPercent, float constrainedHighPercent, float noLimitPercent)
{
if (!std::isfinite(standardPercent) || standardPercent < 0 || standardPercent > 100 || !std::isfinite(constrainedHighPercent) || constrainedHighPercent < 0 || constrainedHighPercent > 100 || !std::isfinite(noLimitPercent) || noLimitPercent < 0 || noLimitPercent > 100) {
ASSERT(std::isfinite(standardPercent));
ASSERT(standardPercent >= 0);
ASSERT(standardPercent <= 100);
ASSERT(std::isfinite(constrainedHighPercent));
ASSERT(constrainedHighPercent >= 0);
ASSERT(constrainedHighPercent <= 100);
ASSERT(std::isfinite(noLimitPercent));
ASSERT(noLimitPercent >= 0);
ASSERT(noLimitPercent <= 100);
// Unexpected value -> Clamp HDR down to prevent misuses.
return standardValue;
}
float sum = standardPercent + constrainedHighPercent + noLimitPercent;
if (!sum) {
ASSERT(sum);
return standardValue;
}
float weightedSum = standardPercent * standardValue + constrainedHighPercent * constrainedHighValue + noLimitPercent * noLimitValue;
float weightedAverage = WTF::safeFPDivision(weightedSum, sum);
return std::clamp(weightedAverage, 0.0f, 1.0f);
}
TextStream& operator<<(TextStream& ts, PlatformDynamicRangeLimit dynamicRangeLimit)
{
ts << dynamicRangeLimit.value();
return ts;
}
} // namespace WebCore
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