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

   1 /*
   2  * Copyright (C) 2013 Google Inc. All rights reserved.
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   4  * Redistribution and use in source and binary forms, with or without
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  10  *     * Redistributions in binary form must reproduce the above
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  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
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  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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/AnimatableImage.h"
  33
  34 #include "core/css/CSSImageValue.h"
  35 #include "core/style/StyleGeneratedImage.h"
  36 #include "wtf/MathExtras.h"
  37
  38 namespace blink {
  39
  40 // FIXME: Once cross-fade works on generated image types, remove this method.
  41 bool AnimatableImage::usesDefaultInterpolationWith(const AnimatableValue* value) const
  42 {
  43     if (!m_value->isImageValue())
  44         return true;
  45     if (!toAnimatableImage(value)->toCSSValue()->isImageValue())
  46         return true;
  47     return false;
  48 }
  49
  50 PassRefPtr<AnimatableValue> AnimatableImage::interpolateTo(const AnimatableValue* value, double fraction) const
  51 {
  52     if (fraction <= 0 || fraction >= 1 || usesDefaultInterpolationWith(value))
  53         return defaultInterpolateTo(this, value, fraction);
  54
  55     CSSValue* fromValue = toCSSValue();
  56     CSSValue* toValue = toAnimatableImage(value)->toCSSValue();
  57
  58     return create(CSSCrossfadeValue::create(fromValue, toValue, CSSPrimitiveValue::create(fraction, CSSPrimitiveValue::UnitType::Number)));
  59 }
  60
  61 bool AnimatableImage::equalTo(const AnimatableValue* value) const
  62 {
  63     return m_value->equals(*toAnimatableImage(value)->m_value.get());
  64 }
  65
  66 }