third_party/WebKit/Source/core/animation/animatable/AnimatableLength.cpp

   1 /*
   2  * Copyright (C) 2013 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
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   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
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  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32 #include "core/animation/animatable/AnimatableLength.h"
  33
  34 #include "platform/CalculationValue.h"
  35 #include "platform/animation/AnimationUtilities.h"
  36
  37 namespace blink {
  38
  39 namespace {
  40
  41 double clampNumber(double value, ValueRange range)
  42 {
  43     if (range == ValueRangeNonNegative)
  44         return std::max(value, 0.0);
  45     ASSERT(range == ValueRangeAll);
  46     return value;
  47 }
  48
  49 } // namespace
  50
  51 AnimatableLength::AnimatableLength(const Length& length, float zoom)
  52 {
  53     ASSERT(zoom);
  54     PixelsAndPercent pixelsAndPercent = length.pixelsAndPercent();
  55     m_pixels = pixelsAndPercent.pixels / zoom;
  56     m_percent = pixelsAndPercent.percent;
  57     m_hasPixels = length.type() != Percent;
  58     m_hasPercent = !length.isFixed();
  59 }
  60
  61 Length AnimatableLength::length(float zoom, ValueRange range) const
  62 {
  63     if (!m_hasPercent)
  64         return Length(clampNumber(m_pixels, range) * zoom, Fixed);
  65     if (!m_hasPixels)
  66         return Length(clampNumber(m_percent, range), Percent);
  67     return Length(CalculationValue::create(PixelsAndPercent(m_pixels * zoom, m_percent), range));
  68 }
  69
  70 PassRefPtr<AnimatableValue> AnimatableLength::interpolateTo(const AnimatableValue* value, double fraction) const
  71 {
  72     const AnimatableLength* length = toAnimatableLength(value);
  73     return create(blend(m_pixels, length->m_pixels, fraction), blend(m_percent, length->m_percent, fraction),
  74         m_hasPixels || length->m_hasPixels, m_hasPercent || length->m_hasPercent);
  75 }
  76
  77 bool AnimatableLength::equalTo(const AnimatableValue* value) const
  78 {
  79     const AnimatableLength* length = toAnimatableLength(value);
  80     return m_pixels == length->m_pixels && m_percent == length->m_percent && m_hasPixels == length->m_hasPixels && m_hasPercent == length->m_hasPercent;
  81 }
  82
  83 } // namespace blink