author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:32:07 +0300 | |
changeset 2 | 303757a437d3 |
parent 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
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/* |
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Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
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Copyright (C) 2006, 2008 Apple Inc. All rights reserved. |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Library General Public |
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License as published by the Free Software Foundation; either |
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version 2 of the License, or (at your option) any later version. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public License |
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along with this library; see the file COPYING.LIB. If not, write to |
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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Boston, MA 02110-1301, USA. |
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*/ |
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#ifndef Length_h |
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#define Length_h |
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#include <wtf/Assertions.h> |
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#include <wtf/FastAllocBase.h> |
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#include <wtf/MathExtras.h> |
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namespace WebCore { |
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class String; |
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const int undefinedLength = -1; |
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const int percentScaleFactor = 128; |
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enum LengthType { Auto, Relative, Percent, Fixed, Static, Intrinsic, MinIntrinsic }; |
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struct Length : FastAllocBase { |
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Length() |
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: m_value(0) |
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{ |
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} |
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Length(LengthType t) |
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: m_value(t) |
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{ |
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} |
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Length(int v, LengthType t, bool q = false) |
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: m_value((v * 16) | (q << 3) | t) // FIXME: Doesn't work if the passed-in value is very large! |
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{ |
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ASSERT(t != Percent); |
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} |
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Length(double v, LengthType t, bool q = false) |
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: m_value(static_cast<int>(v * percentScaleFactor) * 16 | (q << 3) | t) |
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{ |
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ASSERT(t == Percent); |
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} |
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bool operator==(const Length& o) const { return m_value == o.m_value; } |
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bool operator!=(const Length& o) const { return m_value != o.m_value; } |
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int value() const { |
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ASSERT(type() != Percent); |
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return rawValue(); |
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} |
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int rawValue() const { return (m_value & ~0xF) / 16; } |
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double percent() const |
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{ |
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ASSERT(type() == Percent); |
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return static_cast<double>(rawValue()) / percentScaleFactor; |
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} |
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LengthType type() const { return static_cast<LengthType>(m_value & 7); } |
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bool quirk() const { return (m_value >> 3) & 1; } |
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void setValue(LengthType t, int value) |
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{ |
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ASSERT(t != Percent); |
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setRawValue(t, value); |
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} |
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void setRawValue(LengthType t, int value) { m_value = value * 16 | (m_value & 0x8) | t; } |
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void setValue(int value) |
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{ |
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ASSERT(!value || type() != Percent); |
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setRawValue(value); |
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} |
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void setRawValue(int value) { m_value = value * 16 | (m_value & 0xF); } |
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void setValue(LengthType t, double value) |
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{ |
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ASSERT(t == Percent); |
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m_value = static_cast<int>(value * percentScaleFactor) * 16 | (m_value & 0x8) | t; |
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} |
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void setValue(double value) |
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{ |
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ASSERT(type() == Percent); |
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m_value = static_cast<int>(value * percentScaleFactor) * 16 | (m_value & 0xF); |
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} |
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106 |
|
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// note: works only for certain types, returns undefinedLength otherwise |
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int calcValue(int maxValue, bool roundPercentages = false) const |
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{ |
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switch (type()) { |
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case Fixed: |
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return value(); |
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case Percent: |
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if (roundPercentages) |
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return static_cast<int>(round(maxValue * percent() / 100.0)); |
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return maxValue * rawValue() / (100 * percentScaleFactor); |
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case Auto: |
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return maxValue; |
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default: |
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return undefinedLength; |
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} |
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} |
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123 |
|
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int calcMinValue(int maxValue, bool roundPercentages = false) const |
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{ |
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switch (type()) { |
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case Fixed: |
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return value(); |
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case Percent: |
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if (roundPercentages) |
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return static_cast<int>(round(maxValue * percent() / 100.0)); |
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return maxValue * rawValue() / (100 * percentScaleFactor); |
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case Auto: |
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default: |
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return 0; |
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} |
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} |
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|
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float calcFloatValue(int maxValue) const |
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{ |
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switch (type()) { |
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case Fixed: |
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return static_cast<float>(value()); |
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case Percent: |
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return static_cast<float>(maxValue * percent() / 100.0); |
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case Auto: |
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return static_cast<float>(maxValue); |
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default: |
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return static_cast<float>(undefinedLength); |
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} |
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} |
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|
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bool isUndefined() const { return rawValue() == undefinedLength; } |
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bool isZero() const { return !(m_value & ~0xF); } |
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bool isPositive() const { return rawValue() > 0; } |
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bool isNegative() const { return rawValue() < 0; } |
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|
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bool isAuto() const { return type() == Auto; } |
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bool isRelative() const { return type() == Relative; } |
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bool isPercent() const { return type() == Percent; } |
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bool isFixed() const { return type() == Fixed; } |
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bool isStatic() const { return type() == Static; } |
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bool isIntrinsicOrAuto() const { return type() == Auto || type() == MinIntrinsic || type() == Intrinsic; } |
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|
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Length blend(const Length& from, double progress) const |
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{ |
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// Blend two lengths to produce a new length that is in between them. Used for animation. |
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if (!from.isZero() && !isZero() && from.type() != type()) |
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return *this; |
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|
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if (from.isZero() && isZero()) |
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return *this; |
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|
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LengthType resultType = type(); |
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if (isZero()) |
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resultType = from.type(); |
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|
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if (resultType == Percent) { |
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double fromPercent = from.isZero() ? 0. : from.percent(); |
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double toPercent = isZero() ? 0. : percent(); |
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return Length(fromPercent + (toPercent - fromPercent) * progress, Percent); |
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} |
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183 |
|
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int fromValue = from.isZero() ? 0 : from.value(); |
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int toValue = isZero() ? 0 : value(); |
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return Length(int(fromValue + (toValue - fromValue) * progress), resultType); |
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} |
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|
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private: |
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int m_value; |
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}; |
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192 |
|
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Length* newCoordsArray(const String&, int& len); |
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Length* newLengthArray(const String&, int& len); |
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|
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} // namespace WebCore |
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|
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#endif // Length_h |