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/*
* Copyright (C) 2011 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_CALCULATION_VALUE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_CALCULATION_VALUE_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/platform/geometry/length.h"
#include "third_party/blink/renderer/platform/geometry/length_functions.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
namespace blink {
class CalculationExpressionNode;
class PLATFORM_EXPORT CalculationValue : public RefCounted<CalculationValue> {
USING_FAST_MALLOC(CalculationValue);
public:
static scoped_refptr<const CalculationValue> Create(
PixelsAndPercent value,
Length::ValueRange range) {
return base::AdoptRef(new CalculationValue(value, range));
}
// If |expression| simply wraps a |PixelsAndPercent| value, this function
// takes that value directly and discards |expression|.
static scoped_refptr<const CalculationValue> CreateSimplified(
scoped_refptr<const CalculationExpressionNode> expression,
Length::ValueRange range);
~CalculationValue();
float Evaluate(float max_value, const EvaluationInput& = {}) const;
bool operator==(const CalculationValue& o) const;
bool IsExpression() const { return is_expression_; }
bool IsNonNegative() const { return is_non_negative_; }
Length::ValueRange GetValueRange() const {
return is_non_negative_ ? Length::ValueRange::kNonNegative
: Length::ValueRange::kAll;
}
bool HasAuto() const;
bool HasContentOrIntrinsicSize() const;
bool HasAutoOrContentOrIntrinsicSize() const;
bool HasPercent() const;
bool HasPercentOrStretch() const;
bool HasStretch() const;
bool HasMinContent() const;
bool HasMaxContent() const;
bool HasFitContent() const;
bool HasOnlyFixedAndPercent() const;
float Pixels() const {
DCHECK(!IsExpression());
return data_.value.pixels;
}
float Percent() const {
DCHECK(!IsExpression());
return data_.value.percent;
}
PixelsAndPercent GetPixelsAndPercent() const {
DCHECK(!IsExpression());
return data_.value;
}
bool HasExplicitPixels() const {
DCHECK(!IsExpression());
return data_.value.has_explicit_pixels;
}
bool HasExplicitPercent() const {
DCHECK(!IsExpression());
return data_.value.has_explicit_percent;
}
// If |this| is an expression, returns the underlying expression. Otherwise,
// creates one from the underlying |PixelsAndPercent| value.
scoped_refptr<const CalculationExpressionNode> GetOrCreateExpression() const;
scoped_refptr<const CalculationValue> Blend(const CalculationValue& from,
double progress,
Length::ValueRange) const;
scoped_refptr<const CalculationValue> SubtractFromOneHundredPercent() const;
scoped_refptr<const CalculationValue> Add(const CalculationValue&) const;
scoped_refptr<const CalculationValue> Zoom(double factor) const;
private:
CalculationValue(PixelsAndPercent value, Length::ValueRange range)
: data_(value),
is_expression_(false),
is_non_negative_(range == Length::ValueRange::kNonNegative) {}
CalculationValue(scoped_refptr<const CalculationExpressionNode> expression,
Length::ValueRange range);
union DataUnion {
explicit DataUnion(PixelsAndPercent value) : value(value) {}
explicit DataUnion(
scoped_refptr<const CalculationExpressionNode> expression);
~DataUnion();
PixelsAndPercent value;
scoped_refptr<const CalculationExpressionNode> expression;
} data_;
unsigned is_expression_ : 1;
unsigned is_non_negative_ : 1;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_CALCULATION_VALUE_H_
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