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gecko-dev/layout/style/nsStyleCoord.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* representation of length values in computed style data */
#include "nsStyleCoord.h"
#include "nsString.h"
#include "nsCRT.h"
#include "prlog.h"
#include "nsMathUtils.h"
#include "nsStyleContext.h"
nsStyleCoord::nsStyleCoord(nsStyleUnit aUnit)
: mUnit(aUnit)
{
NS_ASSERTION(aUnit < eStyleUnit_Percent, "not a valueless unit");
if (aUnit >= eStyleUnit_Percent) {
mUnit = eStyleUnit_Null;
}
mValue.mInt = 0;
}
nsStyleCoord::nsStyleCoord(PRInt32 aValue, nsStyleUnit aUnit)
: mUnit(aUnit)
{
//if you want to pass in eStyleUnit_Coord, don't. instead, use the
//constructor just above this one... MMP
NS_ASSERTION((aUnit == eStyleUnit_Enumerated) ||
(aUnit == eStyleUnit_Integer), "not an int value");
if ((aUnit == eStyleUnit_Enumerated) ||
(aUnit == eStyleUnit_Integer)) {
mValue.mInt = aValue;
}
else {
mUnit = eStyleUnit_Null;
mValue.mInt = 0;
}
}
nsStyleCoord::nsStyleCoord(float aValue, nsStyleUnit aUnit)
: mUnit(aUnit)
{
if (aUnit < eStyleUnit_Percent || aUnit >= eStyleUnit_Coord) {
NS_NOTREACHED("not a float value");
Reset();
} else {
mValue.mFloat = aValue;
}
}
// FIXME: In C++0x we can rely on the default copy constructor since
// default copy construction is defined properly for unions. But when
// can we actually use that? (It seems to work in gcc 4.4.)
nsStyleCoord& nsStyleCoord::operator=(const nsStyleCoord& aCopy)
{
mUnit = aCopy.mUnit;
if ((eStyleUnit_Percent <= mUnit) && (mUnit < eStyleUnit_Coord)) {
mValue.mFloat = aCopy.mValue.mFloat;
}
else if (IsArrayValue()) {
mValue.mPointer = aCopy.mValue.mPointer;
}
else {
mValue.mInt = aCopy.mValue.mInt;
}
return *this;
}
PRBool nsStyleCoord::operator==(const nsStyleCoord& aOther) const
{
if (mUnit == aOther.mUnit) {
if ((eStyleUnit_Percent <= mUnit) && (mUnit < eStyleUnit_Coord)) {
return PRBool(mValue.mFloat == aOther.mValue.mFloat);
}
else {
return PRBool(mValue.mInt == aOther.mValue.mInt);
}
}
return PR_FALSE;
}
void nsStyleCoord::Reset()
{
mUnit = eStyleUnit_Null;
mValue.mInt = 0;
}
void nsStyleCoord::SetCoordValue(nscoord aValue)
{
mUnit = eStyleUnit_Coord;
mValue.mInt = aValue;
}
void nsStyleCoord::SetIntValue(PRInt32 aValue, nsStyleUnit aUnit)
{
NS_ASSERTION((aUnit == eStyleUnit_Enumerated) ||
(aUnit == eStyleUnit_Integer), "not an int value");
if ((aUnit == eStyleUnit_Enumerated) ||
(aUnit == eStyleUnit_Integer)) {
mUnit = aUnit;
mValue.mInt = aValue;
}
else {
Reset();
}
}
void nsStyleCoord::SetPercentValue(float aValue)
{
mUnit = eStyleUnit_Percent;
mValue.mFloat = aValue;
}
void nsStyleCoord::SetFactorValue(float aValue)
{
mUnit = eStyleUnit_Factor;
mValue.mFloat = aValue;
}
void nsStyleCoord::SetAngleValue(float aValue, nsStyleUnit aUnit)
{
if (aUnit == eStyleUnit_Degree ||
aUnit == eStyleUnit_Grad ||
aUnit == eStyleUnit_Radian) {
mUnit = aUnit;
mValue.mFloat = aValue;
} else {
NS_NOTREACHED("not an angle value");
Reset();
}
}
void nsStyleCoord::SetArrayValue(Array* aValue, nsStyleUnit aUnit)
{
mUnit = aUnit;
if (IsArrayValue()) {
mValue.mPointer = aValue;
} else {
NS_NOTREACHED("not a pointer value");
Reset();
}
}
void nsStyleCoord::SetNormalValue()
{
mUnit = eStyleUnit_Normal;
mValue.mInt = 0;
}
void nsStyleCoord::SetAutoValue()
{
mUnit = eStyleUnit_Auto;
mValue.mInt = 0;
}
void nsStyleCoord::SetNoneValue()
{
mUnit = eStyleUnit_None;
mValue.mInt = 0;
}
// accessors that are not inlined
double
nsStyleCoord::GetAngleValueInRadians() const
{
double angle = mValue.mFloat;
switch (GetUnit()) {
case eStyleUnit_Radian: return angle;
case eStyleUnit_Degree: return angle * M_PI / 180.0;
case eStyleUnit_Grad: return angle * M_PI / 200.0;
default:
NS_NOTREACHED("unrecognized angular unit");
return 0.0;
}
}
PRBool
nsStyleCoord::CalcHasPercent() const
{
NS_ABORT_IF_FALSE(IsCalcUnit(), "caller should check IsCalcUnit()");
nsStyleCoord::Array *a = GetArrayValue();
for (size_t i = 0, i_end = a->Count(); i < i_end; ++i) {
const nsStyleCoord &v = a->Item(i);
if (v.GetUnit() == eStyleUnit_Percent) {
return PR_TRUE;
}
if (v.IsCalcUnit() && v.CalcHasPercent()) {
return PR_TRUE;
}
}
return PR_FALSE;
}
inline void*
nsStyleCoord::Array::operator new(size_t aSelfSize,
nsStyleContext *aAllocationContext,
size_t aItemCount) CPP_THROW_NEW
{
NS_ABORT_IF_FALSE(aItemCount > 0, "cannot have 0 item count");
return aAllocationContext->Alloc(
aSelfSize + sizeof(nsStyleCoord) * (aItemCount - 1));
}
/* static */ nsStyleCoord::Array*
nsStyleCoord::Array::Create(nsStyleContext *aAllocationContext,
PRBool& aCanStoreInRuleTree,
size_t aCount)
{
// While it's not ideal that every time we use an array, we force it
// not to be stored in the rule tree, it's the easiest option for now.
// (This is done only because of the style-context-scoped allocation.)
aCanStoreInRuleTree = PR_FALSE;
return new(aAllocationContext, aCount) Array(aCount);
}
bool
nsStyleCoord::Array::operator==(const Array& aOther) const
{
if (Count() != aOther.Count()) {
return false;
}
for (size_t i = 0; i < mCount; ++i) {
if ((*this)[i] != aOther[i]) {
return false;
}
}
return true;
}
// used by nsStyleSides and nsStyleCorners
#define COMPARE_INDEXED_COORD(i) \
PR_BEGIN_MACRO \
if (mUnits[i] != aOther.mUnits[i]) \
return PR_FALSE; \
if ((eStyleUnit_Percent <= mUnits[i]) && \
(mUnits[i] < eStyleUnit_Coord)) { \
if (mValues[i].mFloat != aOther.mValues[i].mFloat) \
return PR_FALSE; \
} \
else { \
if (mValues[i].mInt != aOther.mValues[i].mInt) \
return PR_FALSE; \
} \
PR_END_MACRO
nsStyleSides::nsStyleSides()
{
memset(this, 0x00, sizeof(nsStyleSides));
}
PRBool nsStyleSides::operator==(const nsStyleSides& aOther) const
{
NS_FOR_CSS_SIDES(i) {
COMPARE_INDEXED_COORD(i);
}
return PR_TRUE;
}
void nsStyleSides::Reset()
{
memset(this, 0x00, sizeof(nsStyleSides));
}
nsStyleCorners::nsStyleCorners()
{
memset(this, 0x00, sizeof(nsStyleCorners));
}
PRBool
nsStyleCorners::operator==(const nsStyleCorners& aOther) const
{
NS_FOR_CSS_HALF_CORNERS(i) {
COMPARE_INDEXED_COORD(i);
}
return PR_TRUE;
}
void nsStyleCorners::Reset()
{
memset(this, 0x00, sizeof(nsStyleCorners));
}
// Validation of NS_SIDE_IS_VERTICAL and NS_HALF_CORNER_IS_X.
#define CASE(side, result) \
PR_STATIC_ASSERT(NS_SIDE_IS_VERTICAL(side) == result)
CASE(NS_SIDE_TOP, PR_FALSE);
CASE(NS_SIDE_RIGHT, PR_TRUE);
CASE(NS_SIDE_BOTTOM, PR_FALSE);
CASE(NS_SIDE_LEFT, PR_TRUE);
#undef CASE
#define CASE(corner, result) \
PR_STATIC_ASSERT(NS_HALF_CORNER_IS_X(corner) == result)
CASE(NS_CORNER_TOP_LEFT_X, PR_TRUE);
CASE(NS_CORNER_TOP_LEFT_Y, PR_FALSE);
CASE(NS_CORNER_TOP_RIGHT_X, PR_TRUE);
CASE(NS_CORNER_TOP_RIGHT_Y, PR_FALSE);
CASE(NS_CORNER_BOTTOM_RIGHT_X, PR_TRUE);
CASE(NS_CORNER_BOTTOM_RIGHT_Y, PR_FALSE);
CASE(NS_CORNER_BOTTOM_LEFT_X, PR_TRUE);
CASE(NS_CORNER_BOTTOM_LEFT_Y, PR_FALSE);
#undef CASE
// Validation of NS_HALF_TO_FULL_CORNER.
#define CASE(corner, result) \
PR_STATIC_ASSERT(NS_HALF_TO_FULL_CORNER(corner) == result)
CASE(NS_CORNER_TOP_LEFT_X, NS_CORNER_TOP_LEFT);
CASE(NS_CORNER_TOP_LEFT_Y, NS_CORNER_TOP_LEFT);
CASE(NS_CORNER_TOP_RIGHT_X, NS_CORNER_TOP_RIGHT);
CASE(NS_CORNER_TOP_RIGHT_Y, NS_CORNER_TOP_RIGHT);
CASE(NS_CORNER_BOTTOM_RIGHT_X, NS_CORNER_BOTTOM_RIGHT);
CASE(NS_CORNER_BOTTOM_RIGHT_Y, NS_CORNER_BOTTOM_RIGHT);
CASE(NS_CORNER_BOTTOM_LEFT_X, NS_CORNER_BOTTOM_LEFT);
CASE(NS_CORNER_BOTTOM_LEFT_Y, NS_CORNER_BOTTOM_LEFT);
#undef CASE
// Validation of NS_FULL_TO_HALF_CORNER.
#define CASE(corner, vert, result) \
PR_STATIC_ASSERT(NS_FULL_TO_HALF_CORNER(corner, vert) == result)
CASE(NS_CORNER_TOP_LEFT, PR_FALSE, NS_CORNER_TOP_LEFT_X);
CASE(NS_CORNER_TOP_LEFT, PR_TRUE, NS_CORNER_TOP_LEFT_Y);
CASE(NS_CORNER_TOP_RIGHT, PR_FALSE, NS_CORNER_TOP_RIGHT_X);
CASE(NS_CORNER_TOP_RIGHT, PR_TRUE, NS_CORNER_TOP_RIGHT_Y);
CASE(NS_CORNER_BOTTOM_RIGHT, PR_FALSE, NS_CORNER_BOTTOM_RIGHT_X);
CASE(NS_CORNER_BOTTOM_RIGHT, PR_TRUE, NS_CORNER_BOTTOM_RIGHT_Y);
CASE(NS_CORNER_BOTTOM_LEFT, PR_FALSE, NS_CORNER_BOTTOM_LEFT_X);
CASE(NS_CORNER_BOTTOM_LEFT, PR_TRUE, NS_CORNER_BOTTOM_LEFT_Y);
#undef CASE
// Validation of NS_SIDE_TO_{FULL,HALF}_CORNER.
#define CASE(side, second, result) \
PR_STATIC_ASSERT(NS_SIDE_TO_FULL_CORNER(side, second) == result)
CASE(NS_SIDE_TOP, PR_FALSE, NS_CORNER_TOP_LEFT);
CASE(NS_SIDE_TOP, PR_TRUE, NS_CORNER_TOP_RIGHT);
CASE(NS_SIDE_RIGHT, PR_FALSE, NS_CORNER_TOP_RIGHT);
CASE(NS_SIDE_RIGHT, PR_TRUE, NS_CORNER_BOTTOM_RIGHT);
CASE(NS_SIDE_BOTTOM, PR_FALSE, NS_CORNER_BOTTOM_RIGHT);
CASE(NS_SIDE_BOTTOM, PR_TRUE, NS_CORNER_BOTTOM_LEFT);
CASE(NS_SIDE_LEFT, PR_FALSE, NS_CORNER_BOTTOM_LEFT);
CASE(NS_SIDE_LEFT, PR_TRUE, NS_CORNER_TOP_LEFT);
#undef CASE
#define CASE(side, second, parallel, result) \
PR_STATIC_ASSERT(NS_SIDE_TO_HALF_CORNER(side, second, parallel) == result)
CASE(NS_SIDE_TOP, PR_FALSE, PR_TRUE, NS_CORNER_TOP_LEFT_X);
CASE(NS_SIDE_TOP, PR_FALSE, PR_FALSE, NS_CORNER_TOP_LEFT_Y);
CASE(NS_SIDE_TOP, PR_TRUE, PR_TRUE, NS_CORNER_TOP_RIGHT_X);
CASE(NS_SIDE_TOP, PR_TRUE, PR_FALSE, NS_CORNER_TOP_RIGHT_Y);
CASE(NS_SIDE_RIGHT, PR_FALSE, PR_FALSE, NS_CORNER_TOP_RIGHT_X);
CASE(NS_SIDE_RIGHT, PR_FALSE, PR_TRUE, NS_CORNER_TOP_RIGHT_Y);
CASE(NS_SIDE_RIGHT, PR_TRUE, PR_FALSE, NS_CORNER_BOTTOM_RIGHT_X);
CASE(NS_SIDE_RIGHT, PR_TRUE, PR_TRUE, NS_CORNER_BOTTOM_RIGHT_Y);
CASE(NS_SIDE_BOTTOM, PR_FALSE, PR_TRUE, NS_CORNER_BOTTOM_RIGHT_X);
CASE(NS_SIDE_BOTTOM, PR_FALSE, PR_FALSE, NS_CORNER_BOTTOM_RIGHT_Y);
CASE(NS_SIDE_BOTTOM, PR_TRUE, PR_TRUE, NS_CORNER_BOTTOM_LEFT_X);
CASE(NS_SIDE_BOTTOM, PR_TRUE, PR_FALSE, NS_CORNER_BOTTOM_LEFT_Y);
CASE(NS_SIDE_LEFT, PR_FALSE, PR_FALSE, NS_CORNER_BOTTOM_LEFT_X);
CASE(NS_SIDE_LEFT, PR_FALSE, PR_TRUE, NS_CORNER_BOTTOM_LEFT_Y);
CASE(NS_SIDE_LEFT, PR_TRUE, PR_FALSE, NS_CORNER_TOP_LEFT_X);
CASE(NS_SIDE_LEFT, PR_TRUE, PR_TRUE, NS_CORNER_TOP_LEFT_Y);
#undef CASE
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