gecko-dev/layout/style/nsCSSValue.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
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*
* 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
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* ***** END LICENSE BLOCK ***** */
/* representation of simple property values within CSS declarations */
#include "nsCSSValue.h"
#include "nsString.h"
#include "nsCSSProps.h"
#include "nsReadableUtils.h"
#include "imgIRequest.h"
#include "nsIDocument.h"
#include "nsContentUtils.h"
#include "nsIPrincipal.h"
#include "nsMathUtils.h"
// Paint forcing
#include "prenv.h"
nsCSSValue::nsCSSValue(PRInt32 aValue, nsCSSUnit aUnit)
: mUnit(aUnit)
{
NS_ASSERTION(aUnit == eCSSUnit_Integer || aUnit == eCSSUnit_Enumerated ||
aUnit == eCSSUnit_EnumColor, "not an int value");
if (aUnit == eCSSUnit_Integer || aUnit == eCSSUnit_Enumerated ||
aUnit == eCSSUnit_EnumColor) {
mValue.mInt = aValue;
}
else {
mUnit = eCSSUnit_Null;
mValue.mInt = 0;
}
}
nsCSSValue::nsCSSValue(float aValue, nsCSSUnit aUnit)
: mUnit(aUnit)
{
NS_ASSERTION(eCSSUnit_Percent <= aUnit, "not a float value");
if (eCSSUnit_Percent <= aUnit) {
mValue.mFloat = aValue;
}
else {
mUnit = eCSSUnit_Null;
mValue.mInt = 0;
}
}
nsCSSValue::nsCSSValue(const nsString& aValue, nsCSSUnit aUnit)
: mUnit(aUnit)
{
NS_ASSERTION(UnitHasStringValue(), "not a string value");
if (UnitHasStringValue()) {
mValue.mString = BufferFromString(aValue);
if (NS_UNLIKELY(!mValue.mString)) {
// XXXbz not much we can do here; just make sure that our promise of a
// non-null mValue.mString holds for string units.
mUnit = eCSSUnit_Null;
}
}
else {
mUnit = eCSSUnit_Null;
mValue.mInt = 0;
}
}
nsCSSValue::nsCSSValue(nsCSSValue::Array* aValue, nsCSSUnit aUnit)
: mUnit(aUnit)
{
NS_ASSERTION(eCSSUnit_Array <= aUnit && aUnit <= eCSSUnit_Function,
"bad unit");
mValue.mArray = aValue;
mValue.mArray->AddRef();
}
nsCSSValue::nsCSSValue(nsCSSValue::URL* aValue)
: mUnit(eCSSUnit_URL)
{
mValue.mURL = aValue;
mValue.mURL->AddRef();
}
nsCSSValue::nsCSSValue(nsCSSValue::Image* aValue)
: mUnit(eCSSUnit_Image)
{
mValue.mImage = aValue;
mValue.mImage->AddRef();
}
nsCSSValue::nsCSSValue(nsCSSValueGradient* aValue)
: mUnit(eCSSUnit_Gradient)
{
mValue.mGradient = aValue;
mValue.mGradient->AddRef();
}
nsCSSValue::nsCSSValue(const nsCSSValue& aCopy)
: mUnit(aCopy.mUnit)
{
if (mUnit <= eCSSUnit_RectIsAuto) {
// nothing to do, but put this important case first
}
else if (eCSSUnit_Percent <= mUnit) {
mValue.mFloat = aCopy.mValue.mFloat;
}
else if (UnitHasStringValue()) {
mValue.mString = aCopy.mValue.mString;
mValue.mString->AddRef();
}
else if (eCSSUnit_Integer <= mUnit && mUnit <= eCSSUnit_EnumColor) {
mValue.mInt = aCopy.mValue.mInt;
}
else if (eCSSUnit_Color == mUnit) {
mValue.mColor = aCopy.mValue.mColor;
}
else if (eCSSUnit_Array <= mUnit && mUnit <= eCSSUnit_Function) {
mValue.mArray = aCopy.mValue.mArray;
mValue.mArray->AddRef();
}
else if (eCSSUnit_URL == mUnit) {
mValue.mURL = aCopy.mValue.mURL;
mValue.mURL->AddRef();
}
else if (eCSSUnit_Image == mUnit) {
mValue.mImage = aCopy.mValue.mImage;
mValue.mImage->AddRef();
}
else if (eCSSUnit_Gradient == mUnit) {
mValue.mGradient = aCopy.mValue.mGradient;
mValue.mGradient->AddRef();
}
else {
NS_NOTREACHED("unknown unit");
}
}
nsCSSValue& nsCSSValue::operator=(const nsCSSValue& aCopy)
{
if (this != &aCopy) {
Reset();
new (this) nsCSSValue(aCopy);
}
return *this;
}
PRBool nsCSSValue::operator==(const nsCSSValue& aOther) const
{
if (mUnit == aOther.mUnit) {
if (mUnit <= eCSSUnit_RectIsAuto) {
return PR_TRUE;
}
else if (UnitHasStringValue()) {
return (NS_strcmp(GetBufferValue(mValue.mString),
GetBufferValue(aOther.mValue.mString)) == 0);
}
else if ((eCSSUnit_Integer <= mUnit) && (mUnit <= eCSSUnit_EnumColor)) {
return mValue.mInt == aOther.mValue.mInt;
}
else if (eCSSUnit_Color == mUnit) {
return mValue.mColor == aOther.mValue.mColor;
}
else if (eCSSUnit_Array <= mUnit && mUnit <= eCSSUnit_Function) {
return *mValue.mArray == *aOther.mValue.mArray;
}
else if (eCSSUnit_URL == mUnit) {
return *mValue.mURL == *aOther.mValue.mURL;
}
else if (eCSSUnit_Image == mUnit) {
return *mValue.mImage == *aOther.mValue.mImage;
}
else if (eCSSUnit_Gradient == mUnit) {
return *mValue.mGradient == *aOther.mValue.mGradient;
}
else {
return mValue.mFloat == aOther.mValue.mFloat;
}
}
return PR_FALSE;
}
double nsCSSValue::GetAngleValueInRadians() const
{
double angle = GetFloatValue();
switch (GetUnit()) {
case eCSSUnit_Radian: return angle;
case eCSSUnit_Degree: return angle * M_PI / 180.0;
case eCSSUnit_Grad: return angle * M_PI / 200.0;
default:
NS_NOTREACHED("unrecognized angular unit");
return 0.0;
}
}
imgIRequest* nsCSSValue::GetImageValue() const
{
NS_ASSERTION(mUnit == eCSSUnit_Image, "not an Image value");
return mValue.mImage->mRequest;
}
nscoord nsCSSValue::GetLengthTwips() const
{
NS_ASSERTION(IsFixedLengthUnit(), "not a fixed length unit");
if (IsFixedLengthUnit()) {
switch (mUnit) {
case eCSSUnit_Inch:
return NS_INCHES_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Millimeter:
return NS_MILLIMETERS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Centimeter:
return NS_CENTIMETERS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Point:
return NS_POINTS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Pica:
return NS_PICAS_TO_TWIPS(mValue.mFloat);
default:
NS_ERROR("should never get here");
break;
}
}
return 0;
}
void nsCSSValue::DoReset()
{
if (UnitHasStringValue()) {
mValue.mString->Release();
} else if (eCSSUnit_Array <= mUnit && mUnit <= eCSSUnit_Function) {
mValue.mArray->Release();
} else if (eCSSUnit_URL == mUnit) {
mValue.mURL->Release();
} else if (eCSSUnit_Image == mUnit) {
mValue.mImage->Release();
} else if (eCSSUnit_Gradient == mUnit) {
mValue.mGradient->Release();
}
mUnit = eCSSUnit_Null;
}
void nsCSSValue::SetIntValue(PRInt32 aValue, nsCSSUnit aUnit)
{
NS_ASSERTION(aUnit == eCSSUnit_Integer || aUnit == eCSSUnit_Enumerated ||
aUnit == eCSSUnit_EnumColor, "not an int value");
Reset();
if (aUnit == eCSSUnit_Integer || aUnit == eCSSUnit_Enumerated ||
aUnit == eCSSUnit_EnumColor) {
mUnit = aUnit;
mValue.mInt = aValue;
}
}
void nsCSSValue::SetPercentValue(float aValue)
{
Reset();
mUnit = eCSSUnit_Percent;
mValue.mFloat = aValue;
}
void nsCSSValue::SetFloatValue(float aValue, nsCSSUnit aUnit)
{
NS_ASSERTION(eCSSUnit_Number <= aUnit, "not a float value");
Reset();
if (eCSSUnit_Number <= aUnit) {
mUnit = aUnit;
mValue.mFloat = aValue;
}
}
void nsCSSValue::SetStringValue(const nsString& aValue,
nsCSSUnit aUnit)
{
Reset();
mUnit = aUnit;
NS_ASSERTION(UnitHasStringValue(), "not a string unit");
if (UnitHasStringValue()) {
mValue.mString = BufferFromString(aValue);
if (NS_UNLIKELY(!mValue.mString)) {
// XXXbz not much we can do here; just make sure that our promise of a
// non-null mValue.mString holds for string units.
mUnit = eCSSUnit_Null;
}
} else
mUnit = eCSSUnit_Null;
}
void nsCSSValue::SetColorValue(nscolor aValue)
{
Reset();
mUnit = eCSSUnit_Color;
mValue.mColor = aValue;
}
void nsCSSValue::SetArrayValue(nsCSSValue::Array* aValue, nsCSSUnit aUnit)
{
NS_ASSERTION(eCSSUnit_Array <= aUnit && aUnit <= eCSSUnit_Function,
"bad unit");
Reset();
mUnit = aUnit;
mValue.mArray = aValue;
mValue.mArray->AddRef();
}
void nsCSSValue::SetURLValue(nsCSSValue::URL* aValue)
{
Reset();
mUnit = eCSSUnit_URL;
mValue.mURL = aValue;
mValue.mURL->AddRef();
}
void nsCSSValue::SetImageValue(nsCSSValue::Image* aValue)
{
Reset();
mUnit = eCSSUnit_Image;
mValue.mImage = aValue;
mValue.mImage->AddRef();
}
void nsCSSValue::SetGradientValue(nsCSSValueGradient* aValue)
{
Reset();
mUnit = eCSSUnit_Gradient;
mValue.mGradient = aValue;
mValue.mGradient->AddRef();
}
void nsCSSValue::SetAutoValue()
{
Reset();
mUnit = eCSSUnit_Auto;
}
void nsCSSValue::SetInheritValue()
{
Reset();
mUnit = eCSSUnit_Inherit;
}
void nsCSSValue::SetInitialValue()
{
Reset();
mUnit = eCSSUnit_Initial;
}
void nsCSSValue::SetNoneValue()
{
Reset();
mUnit = eCSSUnit_None;
}
void nsCSSValue::SetAllValue()
{
Reset();
mUnit = eCSSUnit_All;
}
void nsCSSValue::SetNormalValue()
{
Reset();
mUnit = eCSSUnit_Normal;
}
void nsCSSValue::SetSystemFontValue()
{
Reset();
mUnit = eCSSUnit_System_Font;
}
void nsCSSValue::SetDummyValue()
{
Reset();
mUnit = eCSSUnit_Dummy;
}
void nsCSSValue::SetDummyInheritValue()
{
Reset();
mUnit = eCSSUnit_DummyInherit;
}
void nsCSSValue::StartImageLoad(nsIDocument* aDocument) const
{
NS_PRECONDITION(eCSSUnit_URL == mUnit, "Not a URL value!");
nsCSSValue::Image* image =
new nsCSSValue::Image(mValue.mURL->mURI,
mValue.mURL->mString,
mValue.mURL->mReferrer,
mValue.mURL->mOriginPrincipal,
aDocument);
if (image) {
nsCSSValue* writable = const_cast<nsCSSValue*>(this);
writable->SetImageValue(image);
}
}
PRBool nsCSSValue::IsNonTransparentColor() const
{
// We have the value in the form it was specified in at this point, so we
// have to look for both the keyword 'transparent' and its equivalent in
// rgba notation.
nsDependentString buf;
return
(mUnit == eCSSUnit_Color && NS_GET_A(GetColorValue()) > 0) ||
(mUnit == eCSSUnit_Ident &&
!nsGkAtoms::transparent->Equals(GetStringValue(buf))) ||
(mUnit == eCSSUnit_EnumColor);
}
nsCSSValue::Array*
nsCSSValue::InitFunction(nsCSSKeyword aFunctionId, PRUint32 aNumArgs)
{
nsRefPtr<nsCSSValue::Array> func = Array::Create(aNumArgs + 1);
if (!func) {
return nsnull;
}
func->Item(0).SetIntValue(aFunctionId, eCSSUnit_Enumerated);
SetArrayValue(func, eCSSUnit_Function);
return func;
}
PRBool
nsCSSValue::EqualsFunction(nsCSSKeyword aFunctionId) const
{
if (mUnit != eCSSUnit_Function) {
return PR_FALSE;
}
nsCSSValue::Array* func = mValue.mArray;
NS_ABORT_IF_FALSE(func && func->Count() >= 1 &&
func->Item(0).GetUnit() == eCSSUnit_Enumerated,
"illegally structured function value");
nsCSSKeyword thisFunctionId =
static_cast<nsCSSKeyword>(func->Item(0).GetIntValue());
return thisFunctionId == aFunctionId;
}
// static
nsStringBuffer*
nsCSSValue::BufferFromString(const nsString& aValue)
{
nsStringBuffer* buffer = nsStringBuffer::FromString(aValue);
if (buffer) {
buffer->AddRef();
return buffer;
}
PRUnichar length = aValue.Length();
buffer = nsStringBuffer::Alloc((length + 1) * sizeof(PRUnichar));
if (NS_LIKELY(buffer != 0)) {
PRUnichar* data = static_cast<PRUnichar*>(buffer->Data());
nsCharTraits<PRUnichar>::copy(data, aValue.get(), length);
// Null-terminate.
data[length] = 0;
}
return buffer;
}
nsCSSValue::URL::URL(nsIURI* aURI, nsStringBuffer* aString, nsIURI* aReferrer,
nsIPrincipal* aOriginPrincipal)
: mURI(aURI),
mString(aString),
mReferrer(aReferrer),
mOriginPrincipal(aOriginPrincipal)
{
NS_PRECONDITION(aOriginPrincipal, "Must have an origin principal");
mString->AddRef();
}
nsCSSValue::URL::~URL()
{
mString->Release();
}
PRBool
nsCSSValue::URL::operator==(const URL& aOther) const
{
PRBool eq;
return NS_strcmp(GetBufferValue(mString),
GetBufferValue(aOther.mString)) == 0 &&
(mURI == aOther.mURI || // handles null == null
(mURI && aOther.mURI &&
NS_SUCCEEDED(mURI->Equals(aOther.mURI, &eq)) &&
eq)) &&
(mOriginPrincipal == aOther.mOriginPrincipal ||
(NS_SUCCEEDED(mOriginPrincipal->Equals(aOther.mOriginPrincipal,
&eq)) && eq));
}
PRBool
nsCSSValue::URL::URIEquals(const URL& aOther) const
{
PRBool eq;
// Worth comparing mURI to aOther.mURI and mOriginPrincipal to
// aOther.mOriginPrincipal, because in the (probably common) case when this
// value was one of the ones that in fact did not change this will be our
// fast path to equality
return (mURI == aOther.mURI ||
(NS_SUCCEEDED(mURI->Equals(aOther.mURI, &eq)) && eq)) &&
(mOriginPrincipal == aOther.mOriginPrincipal ||
(NS_SUCCEEDED(mOriginPrincipal->Equals(aOther.mOriginPrincipal,
&eq)) && eq));
}
nsCSSValue::Image::Image(nsIURI* aURI, nsStringBuffer* aString,
nsIURI* aReferrer, nsIPrincipal* aOriginPrincipal,
nsIDocument* aDocument)
: URL(aURI, aString, aReferrer, aOriginPrincipal)
{
if (mURI &&
nsContentUtils::CanLoadImage(mURI, aDocument, aDocument,
aOriginPrincipal)) {
nsContentUtils::LoadImage(mURI, aDocument, aOriginPrincipal, aReferrer,
nsnull, nsIRequest::LOAD_NORMAL,
getter_AddRefs(mRequest));
}
}
nsCSSValue::Image::~Image()
{
}
nsCSSValueGradientStop::nsCSSValueGradientStop()
: mLocation(eCSSUnit_None),
mColor(eCSSUnit_Null)
{
MOZ_COUNT_CTOR(nsCSSValueGradientStop);
}
nsCSSValueGradientStop::nsCSSValueGradientStop(const nsCSSValueGradientStop& aOther)
: mLocation(aOther.mLocation),
mColor(aOther.mColor)
{
MOZ_COUNT_CTOR(nsCSSValueGradientStop);
}
nsCSSValueGradientStop::~nsCSSValueGradientStop()
{
MOZ_COUNT_DTOR(nsCSSValueGradientStop);
}
nsCSSValueGradient::nsCSSValueGradient(PRBool aIsRadial,
PRBool aIsRepeating)
: mIsRadial(aIsRadial),
mIsRepeating(aIsRepeating),
mBgPosX(eCSSUnit_None),
mBgPosY(eCSSUnit_None),
mAngle(eCSSUnit_None),
mRadialShape(eCSSUnit_None),
mRadialSize(eCSSUnit_None)
{
}