flutter_flutter/sky/engine/platform/LengthFunctions.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.

    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 "flutter/sky/engine/platform/LengthFunctions.h"

#include "flutter/sky/engine/platform/LayoutUnit.h"
#include "flutter/sky/engine/platform/LengthSize.h"

namespace blink {

int intValueForLength(const Length& length, LayoutUnit maximumValue) {
  return static_cast<int>(valueForLength(length, maximumValue));
}

float floatValueForLength(const Length& length, float 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 Intrinsic:
    case MinIntrinsic:
    case MinContent:
    case MaxContent:
    case FitContent:
    case DeviceWidth:
    case DeviceHeight:
    case MaxSizeNone:
      ASSERT_NOT_REACHED();
      return 0;
  }
  ASSERT_NOT_REACHED();
  return 0;
}

LayoutUnit minimumValueForLength(const Length& length,
                                 LayoutUnit maximumValue) {
  switch (length.type()) {
    case Fixed:
      return length.value();
    case Percent:
      // 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 FillAvailable:
    case Auto:
      return 0;
    case Intrinsic:
    case MinIntrinsic:
    case MinContent:
    case MaxContent:
    case FitContent:
    case DeviceWidth:
    case DeviceHeight:
    case MaxSizeNone:
      ASSERT_NOT_REACHED();
      return 0;
  }
  ASSERT_NOT_REACHED();
  return 0;
}

LayoutUnit roundedMinimumValueForLength(const Length& length,
                                        LayoutUnit maximumValue) {
  if (length.type() == Percent)
    return static_cast<LayoutUnit>(
        round(maximumValue * length.percent() / 100.0f));
  return minimumValueForLength(length, maximumValue);
}

LayoutUnit valueForLength(const Length& length, LayoutUnit maximumValue) {
  switch (length.type()) {
    case Fixed:
    case Percent:
    case Calculated:
      return minimumValueForLength(length, maximumValue);
    case FillAvailable:
    case Auto:
      return maximumValue;
    case Intrinsic:
    case MinIntrinsic:
    case MinContent:
    case MaxContent:
    case FitContent:
    case DeviceWidth:
    case DeviceHeight:
    case MaxSizeNone:
      ASSERT_NOT_REACHED();
      return 0;
  }
  ASSERT_NOT_REACHED();
  return 0;
}

FloatSize floatSizeForLengthSize(const LengthSize& lengthSize,
                                 const FloatSize& boxSize) {
  return FloatSize(floatValueForLength(lengthSize.width(), boxSize.width()),
                   floatValueForLength(lengthSize.height(), boxSize.height()));
}

}  // namespace blink