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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller ( mueller@kde.org )
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights
* reserved.
* Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
*
* 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 "platform/Length.h"
#include "platform/CalculationValue.h"
#include "platform/animation/AnimationUtilities.h"
using namespace WTF;
namespace blink {
class CalculationValueHandleMap {
USING_FAST_MALLOC(CalculationValueHandleMap);
WTF_MAKE_NONCOPYABLE(CalculationValueHandleMap);
public:
CalculationValueHandleMap() : m_index(1) {}
int insert(PassRefPtr<CalculationValue> calcValue) {
ASSERT(m_index);
// FIXME calc(): https://bugs.webkit.org/show_bug.cgi?id=80489
// This monotonically increasing handle generation scheme is potentially
// wasteful of the handle space. Consider reusing empty handles.
while (m_map.contains(m_index))
m_index++;
m_map.set(m_index, std::move(calcValue));
return m_index;
}
void remove(int index) {
ASSERT(m_map.contains(index));
m_map.remove(index);
}
CalculationValue& get(int index) {
ASSERT(m_map.contains(index));
return *m_map.get(index);
}
void decrementRef(int index) {
ASSERT(m_map.contains(index));
CalculationValue* value = m_map.get(index);
if (value->hasOneRef()) {
// Force the CalculationValue destructor early to avoid a potential
// recursive call inside HashMap remove().
m_map.set(index, nullptr);
m_map.remove(index);
} else {
value->deref();
}
}
private:
int m_index;
HashMap<int, RefPtr<CalculationValue>> m_map;
};
static CalculationValueHandleMap& calcHandles() {
DEFINE_STATIC_LOCAL(CalculationValueHandleMap, handleMap, ());
return handleMap;
}
Length::Length(PassRefPtr<CalculationValue> calc)
: m_quirk(false), m_type(Calculated), m_isFloat(false) {
m_intValue = calcHandles().insert(std::move(calc));
}
Length Length::blendMixedTypes(const Length& from,
double progress,
ValueRange range) const {
ASSERT(from.isSpecified());
ASSERT(isSpecified());
PixelsAndPercent fromPixelsAndPercent = from.getPixelsAndPercent();
PixelsAndPercent toPixelsAndPercent = getPixelsAndPercent();
const float pixels = blink::blend(fromPixelsAndPercent.pixels,
toPixelsAndPercent.pixels, progress);
const float percent = blink::blend(fromPixelsAndPercent.percent,
toPixelsAndPercent.percent, progress);
return Length(
CalculationValue::create(PixelsAndPercent(pixels, percent), range));
}
PixelsAndPercent Length::getPixelsAndPercent() const {
switch (type()) {
case Fixed:
return PixelsAndPercent(value(), 0);
case Percent:
return PixelsAndPercent(0, value());
case Calculated:
return getCalculationValue().getPixelsAndPercent();
default:
ASSERT_NOT_REACHED();
return PixelsAndPercent(0, 0);
}
}
Length Length::subtractFromOneHundredPercent() const {
PixelsAndPercent result = getPixelsAndPercent();
result.pixels = -result.pixels;
result.percent = 100 - result.percent;
if (result.pixels && result.percent)
return Length(CalculationValue::create(result, ValueRangeAll));
if (result.percent)
return Length(result.percent, Percent);
return Length(result.pixels, Fixed);
}
Length Length::zoom(double factor) const {
switch (type()) {
case Fixed:
return Length(getFloatValue() * factor, Fixed);
case Calculated: {
PixelsAndPercent result = getPixelsAndPercent();
result.pixels *= factor;
return Length(CalculationValue::create(
result, getCalculationValue().getValueRange()));
}
default:
return *this;
}
}
CalculationValue& Length::getCalculationValue() const {
ASSERT(isCalculated());
return calcHandles().get(calculationHandle());
}
void Length::incrementCalculatedRef() const {
ASSERT(isCalculated());
getCalculationValue().ref();
}
void Length::decrementCalculatedRef() const {
ASSERT(isCalculated());
calcHandles().decrementRef(calculationHandle());
}
float Length::nonNanCalculatedValue(LayoutUnit maxValue) const {
ASSERT(isCalculated());
float result = getCalculationValue().evaluate(maxValue.toFloat());
if (std::isnan(result))
return 0;
return result;
}
bool Length::isCalculatedEqual(const Length& o) const {
return isCalculated() &&
(&getCalculationValue() == &o.getCalculationValue() ||
getCalculationValue() == o.getCalculationValue());
}
struct SameSizeAsLength {
int32_t value;
int32_t metaData;
};
static_assert(sizeof(Length) == sizeof(SameSizeAsLength),
"length should stay small");
} // namespace blink
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