Source/core/css/CSSLengthFunctions.cpp

/*
    Copyright (C) 1999 Lars Knoll (knoll@kde.org)
    Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
    Copyright (C) 2011 Rik Cabanier (cabanier@adobe.com)
    Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
    Copyright (C) 2012 Motorola Mobility, Inc. All rights reserved.
    Copyright (C) 2013 Google, Inc. All rights reserved.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include "config.h"
#include "core/css/CSSLengthFunctions.h"

#include "core/rendering/RenderView.h"
#include "platform/LayoutUnit.h"
#include "platform/Length.h"
#include "platform/LengthFunctions.h"

namespace WebCore {

int minimumIntValueForLength(const Length& length, LayoutUnit maximumValue, RenderView* renderView, bool roundPercentages)
{
    return static_cast<int>(minimumValueForLength(length, maximumValue, renderView, roundPercentages));
}

int intValueForLength(const Length& length, LayoutUnit maximumValue, RenderView* renderView, bool roundPercentages)
{
    return static_cast<int>(valueForLength(length, maximumValue, renderView, roundPercentages));
}

LayoutUnit minimumValueForLength(const Length& length, LayoutUnit maximumValue, RenderView* renderView, bool roundPercentages)
{
    switch (length.type()) {
    case Fixed:
        return length.value();
    case Percent:
        if (roundPercentages)
            return static_cast<LayoutUnit>(round(maximumValue * length.percent() / 100.0f));
        // Don't remove the extra cast to float. It is needed for rounding on 32-bit Intel machines that use the FPU stack.
        return static_cast<float>(maximumValue * length.percent() / 100.0f);
    case Calculated:
        return length.nonNanCalculatedValue(maximumValue);
    case ViewportPercentageWidth:
        return renderView ? renderView->viewportPercentageWidth(length.viewportPercentageLength()) : LayoutUnit(0);
    case ViewportPercentageHeight:
        return renderView ? renderView->viewportPercentageHeight(length.viewportPercentageLength()) : LayoutUnit(0);
    case ViewportPercentageMin:
        return renderView ? renderView->viewportPercentageMin(length.viewportPercentageLength()) : LayoutUnit(0);
    case ViewportPercentageMax:
        return renderView ? renderView->viewportPercentageMax(length.viewportPercentageLength()) : LayoutUnit(0);
    case FillAvailable:
    case Auto:
        return 0;
    case Relative:
    case Intrinsic:
    case MinIntrinsic:
    case MinContent:
    case MaxContent:
    case FitContent:
    case ExtendToZoom:
    case Undefined:
        ASSERT_NOT_REACHED();
        return 0;
    }
    ASSERT_NOT_REACHED();
    return 0;
}

LayoutUnit valueForLength(const Length& length, LayoutUnit maximumValue, RenderView* renderView, bool roundPercentages)
{
    switch (length.type()) {
    case Fixed:
    case Percent:
    case Calculated:
    case ViewportPercentageWidth:
    case ViewportPercentageHeight:
    case ViewportPercentageMin:
    case ViewportPercentageMax:
        return minimumValueForLength(length, maximumValue, renderView, roundPercentages);
    case FillAvailable:
    case Auto:
        return maximumValue;
    case Relative:
    case Intrinsic:
    case MinIntrinsic:
    case MinContent:
    case MaxContent:
    case FitContent:
    case ExtendToZoom:
    case Undefined:
        ASSERT_NOT_REACHED();
        return 0;
    }
    ASSERT_NOT_REACHED();
    return 0;
}

// This method has code duplicated in platform/LengthFunctions.cpp.
// Any changes here most likely also need to be applied there.
float floatValueForLength(const Length& length, float maximumValue, RenderView* renderView)
{
    if (!renderView)
        return floatValueForLength(length, maximumValue);

    switch (length.type()) {
    case Fixed:
        return length.getFloatValue();
    case Percent:
        return static_cast<float>(maximumValue * length.percent() / 100.0f);
    case FillAvailable:
    case Auto:
        return static_cast<float>(maximumValue);
    case Calculated:
        return length.nonNanCalculatedValue(maximumValue);
    case ViewportPercentageWidth:
        return static_cast<int>(renderView->viewportPercentageWidth(length.viewportPercentageLength()));
    case ViewportPercentageHeight:
        return static_cast<int>(renderView->viewportPercentageHeight(length.viewportPercentageLength()));
    case ViewportPercentageMin:
        return static_cast<int>(renderView->viewportPercentageMin(length.viewportPercentageLength()));
    case ViewportPercentageMax:
        return static_cast<int>(renderView->viewportPercentageMax(length.viewportPercentageLength()));
    case Relative:
    case Intrinsic:
    case MinIntrinsic:
    case MinContent:
    case MaxContent:
    case FitContent:
    case ExtendToZoom:
    case Undefined:
        ASSERT_NOT_REACHED();
        return 0;
    }
    ASSERT_NOT_REACHED();
    return 0;
}

} // namespace WebCore