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nsRuleNode.cpp
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nsRuleNode.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=78: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* a node in the lexicographic tree of rules that match an element,
* responsible for converting the rules' information into computed style
*/
#include "nsRuleNode.h"
#include "nscore.h"
#include "nsIServiceManager.h"
#include "nsIWidget.h"
#include "mozilla/LookAndFeel.h"
#include "nsIPresShell.h"
#include "nsFontMetrics.h"
#include "gfxFont.h"
#include "nsStyleUtil.h"
#include "nsCSSPseudoElements.h"
#include "nsThemeConstants.h"
#include "nsITheme.h"
#include "pldhash.h"
#include "nsStyleContext.h"
#include "nsStyleSet.h"
#include "nsSize.h"
#include "imgIRequest.h"
#include "nsRuleData.h"
#include "nsIStyleRule.h"
#include "nsBidiUtils.h"
#include "nsUnicharUtils.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "nsCSSKeywords.h"
#include "nsCSSProps.h"
#include "nsTArray.h"
#include "nsContentUtils.h"
#include "mozilla/dom/Element.h"
#include "CSSCalc.h"
#include "nsPrintfCString.h"
#include "mozilla/Util.h"
#if defined(_MSC_VER) || defined(__MINGW32__)
#include <malloc.h>
#ifdef _MSC_VER
#define alloca _alloca
#endif
#endif
#ifdef SOLARIS
#include <alloca.h>
#endif
using namespace mozilla;
using namespace mozilla::dom;
#define NS_SET_IMAGE_REQUEST(method_, context_, request_) \
if ((context_)->PresContext()->IsDynamic()) { \
method_(request_); \
} else { \
nsCOMPtr<imgIRequest> req = nsContentUtils::GetStaticRequest(request_); \
method_(req); \
}
/*
* For storage of an |nsRuleNode|'s children in a PLDHashTable.
*/
struct ChildrenHashEntry : public PLDHashEntryHdr {
// key is |mRuleNode->GetKey()|
nsRuleNode *mRuleNode;
};
/* static */ PLDHashNumber
nsRuleNode::ChildrenHashHashKey(PLDHashTable *aTable, const void *aKey)
{
const nsRuleNode::Key *key =
static_cast<const nsRuleNode::Key*>(aKey);
// Disagreement on importance and level for the same rule is extremely
// rare, so hash just on the rule.
return PL_DHashVoidPtrKeyStub(aTable, key->mRule);
}
/* static */ bool
nsRuleNode::ChildrenHashMatchEntry(PLDHashTable *aTable,
const PLDHashEntryHdr *aHdr,
const void *aKey)
{
const ChildrenHashEntry *entry =
static_cast<const ChildrenHashEntry*>(aHdr);
const nsRuleNode::Key *key =
static_cast<const nsRuleNode::Key*>(aKey);
return entry->mRuleNode->GetKey() == *key;
}
/* static */ PLDHashTableOps
nsRuleNode::ChildrenHashOps = {
// It's probably better to allocate the table itself using malloc and
// free rather than the pres shell's arena because the table doesn't
// grow very often and the pres shell's arena doesn't recycle very
// large size allocations.
PL_DHashAllocTable,
PL_DHashFreeTable,
ChildrenHashHashKey,
ChildrenHashMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
};
// EnsureBlockDisplay:
// - if the display value (argument) is not a block-type
// then we set it to a valid block display value
// - For enforcing the floated/positioned element CSS2 rules
static void EnsureBlockDisplay(PRUint8& display)
{
// see if the display value is already a block
switch (display) {
case NS_STYLE_DISPLAY_NONE :
// never change display:none *ever*
case NS_STYLE_DISPLAY_TABLE :
case NS_STYLE_DISPLAY_BLOCK :
case NS_STYLE_DISPLAY_LIST_ITEM :
// do not muck with these at all - already blocks
// This is equivalent to nsStyleDisplay::IsBlockOutside. (XXX Maybe we
// should just call that?)
// This needs to match the check done in
// nsCSSFrameConstructor::FindMathMLData for <math>.
break;
case NS_STYLE_DISPLAY_INLINE_TABLE :
// make inline tables into tables
display = NS_STYLE_DISPLAY_TABLE;
break;
default :
// make it a block
display = NS_STYLE_DISPLAY_BLOCK;
}
}
static nscoord CalcLengthWith(const nsCSSValue& aValue,
nscoord aFontSize,
const nsStyleFont* aStyleFont,
nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
bool aUseProvidedRootEmSize,
bool aUseUserFontSet,
bool& aCanStoreInRuleTree);
struct CalcLengthCalcOps : public css::BasicCoordCalcOps,
public css::NumbersAlreadyNormalizedOps
{
// All of the parameters to CalcLengthWith except aValue.
const nscoord mFontSize;
const nsStyleFont* const mStyleFont;
nsStyleContext* const mStyleContext;
nsPresContext* const mPresContext;
const bool mUseProvidedRootEmSize;
const bool mUseUserFontSet;
bool& mCanStoreInRuleTree;
CalcLengthCalcOps(nscoord aFontSize, const nsStyleFont* aStyleFont,
nsStyleContext* aStyleContext, nsPresContext* aPresContext,
bool aUseProvidedRootEmSize, bool aUseUserFontSet,
bool& aCanStoreInRuleTree)
: mFontSize(aFontSize),
mStyleFont(aStyleFont),
mStyleContext(aStyleContext),
mPresContext(aPresContext),
mUseProvidedRootEmSize(aUseProvidedRootEmSize),
mUseUserFontSet(aUseUserFontSet),
mCanStoreInRuleTree(aCanStoreInRuleTree)
{
}
result_type ComputeLeafValue(const nsCSSValue& aValue)
{
return CalcLengthWith(aValue, mFontSize, mStyleFont,
mStyleContext, mPresContext, mUseProvidedRootEmSize,
mUseUserFontSet, mCanStoreInRuleTree);
}
};
static inline nscoord ScaleCoord(const nsCSSValue &aValue, float factor)
{
return NSToCoordRoundWithClamp(aValue.GetFloatValue() * factor);
}
already_AddRefed<nsFontMetrics>
GetMetricsFor(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
const nsStyleFont* aStyleFont,
nscoord aFontSize, // overrides value from aStyleFont
bool aUseUserFontSet)
{
nsFont font = aStyleFont->mFont;
font.size = aFontSize;
gfxUserFontSet *fs = nsnull;
if (aUseUserFontSet) {
fs = aPresContext->GetUserFontSet();
}
nsRefPtr<nsFontMetrics> fm;
aPresContext->DeviceContext()->GetMetricsFor(font,
aStyleFont->mLanguage,
fs, *getter_AddRefs(fm));
return fm.forget();
}
static nscoord CalcLengthWith(const nsCSSValue& aValue,
nscoord aFontSize,
const nsStyleFont* aStyleFont,
nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
bool aUseProvidedRootEmSize,
// aUseUserFontSet should always be true
// except when called from
// CalcLengthWithInitialFont.
bool aUseUserFontSet,
bool& aCanStoreInRuleTree)
{
NS_ASSERTION(aValue.IsLengthUnit() || aValue.IsCalcUnit(),
"not a length or calc unit");
NS_ASSERTION(aStyleFont || aStyleContext,
"Must have style data");
NS_ASSERTION(!aStyleFont || !aStyleContext,
"Duplicate sources of data");
NS_ASSERTION(aPresContext, "Must have prescontext");
if (aValue.IsFixedLengthUnit()) {
return aValue.GetFixedLength(aPresContext);
}
if (aValue.IsPixelLengthUnit()) {
return aValue.GetPixelLength();
}
// Common code for all units other than pixel-based units and fixed-length
// units:
aCanStoreInRuleTree = false;
const nsStyleFont *styleFont =
aStyleFont ? aStyleFont : aStyleContext->GetStyleFont();
if (aFontSize == -1) {
// XXX Should this be styleFont->mSize instead to avoid taking minfontsize
// prefs into account?
aFontSize = styleFont->mFont.size;
}
switch (aValue.GetUnit()) {
case eCSSUnit_RootEM: {
nscoord rootFontSize;
if (aUseProvidedRootEmSize) {
// We should use the provided aFontSize as the reference length to
// scale. This only happens when we are calculating font-size or
// an equivalent (scriptminsize or CalcLengthWithInitialFont) on
// the root element, in which case aFontSize is already the
// value we want.
rootFontSize = aFontSize;
} else if (aStyleContext && !aStyleContext->GetParent()) {
// This is the root element (XXX we don't really know this, but
// nsRuleNode::SetFont makes the same assumption!), so we should
// use GetStyleFont on this context to get the root element's
// font size.
rootFontSize = styleFont->mFont.size;
} else {
// This is not the root element or we are calculating something other
// than font size, so rem is relative to the root element's font size.
nsRefPtr<nsStyleContext> rootStyle;
const nsStyleFont *rootStyleFont = styleFont;
Element* docElement = aPresContext->Document()->GetRootElement();
if (docElement) {
rootStyle = aPresContext->StyleSet()->ResolveStyleFor(docElement,
nsnull);
if (rootStyle) {
rootStyleFont = rootStyle->GetStyleFont();
}
}
rootFontSize = rootStyleFont->mFont.size;
}
return ScaleCoord(aValue, float(rootFontSize));
}
case eCSSUnit_EM: {
return ScaleCoord(aValue, float(aFontSize));
// XXX scale against font metrics height instead?
}
case eCSSUnit_XHeight: {
nsRefPtr<nsFontMetrics> fm =
GetMetricsFor(aPresContext, aStyleContext, styleFont,
aFontSize, aUseUserFontSet);
return ScaleCoord(aValue, float(fm->XHeight()));
}
case eCSSUnit_Char: {
nsRefPtr<nsFontMetrics> fm =
GetMetricsFor(aPresContext, aStyleContext, styleFont,
aFontSize, aUseUserFontSet);
gfxFloat zeroWidth = (fm->GetThebesFontGroup()->GetFontAt(0)
->GetMetrics().zeroOrAveCharWidth);
return ScaleCoord(aValue, ceil(aPresContext->AppUnitsPerDevPixel() *
zeroWidth));
}
// For properties for which lengths are the *only* units accepted in
// calc(), we can handle calc() here and just compute a final
// result. We ensure that we don't get to this code for other
// properties by not calling CalcLength in those cases: SetCoord
// only calls CalcLength for a calc when it is appropriate to do so.
case eCSSUnit_Calc:
case eCSSUnit_Calc_Plus:
case eCSSUnit_Calc_Minus:
case eCSSUnit_Calc_Times_L:
case eCSSUnit_Calc_Times_R:
case eCSSUnit_Calc_Divided: {
CalcLengthCalcOps ops(aFontSize, aStyleFont,
aStyleContext, aPresContext,
aUseProvidedRootEmSize, aUseUserFontSet,
aCanStoreInRuleTree);
return css::ComputeCalc(aValue, ops);
}
default:
NS_NOTREACHED("unexpected unit");
break;
}
return 0;
}
/* static */ nscoord
nsRuleNode::CalcLength(const nsCSSValue& aValue,
nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
bool& aCanStoreInRuleTree)
{
NS_ASSERTION(aStyleContext, "Must have style data");
return CalcLengthWith(aValue, -1, nsnull,
aStyleContext, aPresContext,
false, true, aCanStoreInRuleTree);
}
/* Inline helper function to redirect requests to CalcLength. */
static inline nscoord CalcLength(const nsCSSValue& aValue,
nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
bool& aCanStoreInRuleTree)
{
return nsRuleNode::CalcLength(aValue, aStyleContext,
aPresContext, aCanStoreInRuleTree);
}
/* static */ nscoord
nsRuleNode::CalcLengthWithInitialFont(nsPresContext* aPresContext,
const nsCSSValue& aValue)
{
nsStyleFont defaultFont(aPresContext); // FIXME: best language?
bool canStoreInRuleTree;
return CalcLengthWith(aValue, -1, &defaultFont,
nsnull, aPresContext,
true, false, canStoreInRuleTree);
}
struct LengthPercentPairCalcOps : public css::NumbersAlreadyNormalizedOps
{
typedef nsRuleNode::ComputedCalc result_type;
LengthPercentPairCalcOps(nsStyleContext* aContext,
nsPresContext* aPresContext,
bool& aCanStoreInRuleTree)
: mContext(aContext),
mPresContext(aPresContext),
mCanStoreInRuleTree(aCanStoreInRuleTree),
mHasPercent(false) {}
nsStyleContext* mContext;
nsPresContext* mPresContext;
bool& mCanStoreInRuleTree;
bool mHasPercent;
result_type ComputeLeafValue(const nsCSSValue& aValue)
{
if (aValue.GetUnit() == eCSSUnit_Percent) {
mHasPercent = true;
return result_type(0, aValue.GetPercentValue());
}
return result_type(CalcLength(aValue, mContext, mPresContext,
mCanStoreInRuleTree),
0.0f);
}
result_type
MergeAdditive(nsCSSUnit aCalcFunction,
result_type aValue1, result_type aValue2)
{
if (aCalcFunction == eCSSUnit_Calc_Plus) {
return result_type(NSCoordSaturatingAdd(aValue1.mLength,
aValue2.mLength),
aValue1.mPercent + aValue2.mPercent);
}
NS_ABORT_IF_FALSE(aCalcFunction == eCSSUnit_Calc_Minus,
"min() and max() are not allowed in calc() on "
"transform");
return result_type(NSCoordSaturatingSubtract(aValue1.mLength,
aValue2.mLength, 0),
aValue1.mPercent - aValue2.mPercent);
}
result_type
MergeMultiplicativeL(nsCSSUnit aCalcFunction,
float aValue1, result_type aValue2)
{
NS_ABORT_IF_FALSE(aCalcFunction == eCSSUnit_Calc_Times_L,
"unexpected unit");
return result_type(NSCoordSaturatingMultiply(aValue2.mLength, aValue1),
aValue1 * aValue2.mPercent);
}
result_type
MergeMultiplicativeR(nsCSSUnit aCalcFunction,
result_type aValue1, float aValue2)
{
NS_ABORT_IF_FALSE(aCalcFunction == eCSSUnit_Calc_Times_R ||
aCalcFunction == eCSSUnit_Calc_Divided,
"unexpected unit");
if (aCalcFunction == eCSSUnit_Calc_Divided) {
aValue2 = 1.0f / aValue2;
}
return result_type(NSCoordSaturatingMultiply(aValue1.mLength, aValue2),
aValue1.mPercent * aValue2);
}
};
static void
SpecifiedCalcToComputedCalc(const nsCSSValue& aValue, nsStyleCoord& aCoord,
nsStyleContext* aStyleContext,
bool& aCanStoreInRuleTree)
{
LengthPercentPairCalcOps ops(aStyleContext, aStyleContext->PresContext(),
aCanStoreInRuleTree);
nsRuleNode::ComputedCalc vals = ComputeCalc(aValue, ops);
nsStyleCoord::Calc *calcObj =
new (aStyleContext->Alloc(sizeof(nsStyleCoord::Calc))) nsStyleCoord::Calc;
// Because we use aStyleContext->Alloc(), we have to store the result
// on the style context and not in the rule tree.
aCanStoreInRuleTree = false;
calcObj->mLength = vals.mLength;
calcObj->mPercent = vals.mPercent;
calcObj->mHasPercent = ops.mHasPercent;
aCoord.SetCalcValue(calcObj);
}
/* static */ nsRuleNode::ComputedCalc
nsRuleNode::SpecifiedCalcToComputedCalc(const nsCSSValue& aValue,
nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
bool& aCanStoreInRuleTree)
{
LengthPercentPairCalcOps ops(aStyleContext, aPresContext,
aCanStoreInRuleTree);
return ComputeCalc(aValue, ops);
}
// This is our public API for handling calc() expressions that involve
// percentages.
/* static */ nscoord
nsRuleNode::ComputeComputedCalc(const nsStyleCoord& aValue,
nscoord aPercentageBasis)
{
nsStyleCoord::Calc *calc = aValue.GetCalcValue();
return calc->mLength +
NSToCoordFloorClamped(aPercentageBasis * calc->mPercent);
}
/* static */ nscoord
nsRuleNode::ComputeCoordPercentCalc(const nsStyleCoord& aCoord,
nscoord aPercentageBasis)
{
switch (aCoord.GetUnit()) {
case eStyleUnit_Coord:
return aCoord.GetCoordValue();
case eStyleUnit_Percent:
return NSToCoordFloorClamped(aPercentageBasis * aCoord.GetPercentValue());
case eStyleUnit_Calc:
return ComputeComputedCalc(aCoord, aPercentageBasis);
default:
NS_ABORT_IF_FALSE(false, "unexpected unit");
return 0;
}
}
/* Given an enumerated value that represents a box position, converts it to
* a float representing the percentage of the box it corresponds to. For
* example, "center" becomes 0.5f.
*
* @param aEnumValue The enumerated value.
* @return The float percent it corresponds to.
*/
static float
GetFloatFromBoxPosition(PRInt32 aEnumValue)
{
switch (aEnumValue) {
case NS_STYLE_BG_POSITION_LEFT:
case NS_STYLE_BG_POSITION_TOP:
return 0.0f;
case NS_STYLE_BG_POSITION_RIGHT:
case NS_STYLE_BG_POSITION_BOTTOM:
return 1.0f;
default:
NS_NOTREACHED("unexpected value");
// fall through
case NS_STYLE_BG_POSITION_CENTER:
return 0.5f;
}
}
#define SETCOORD_NORMAL 0x01 // N
#define SETCOORD_AUTO 0x02 // A
#define SETCOORD_INHERIT 0x04 // H
#define SETCOORD_PERCENT 0x08 // P
#define SETCOORD_FACTOR 0x10 // F
#define SETCOORD_LENGTH 0x20 // L
#define SETCOORD_INTEGER 0x40 // I
#define SETCOORD_ENUMERATED 0x80 // E
#define SETCOORD_NONE 0x100 // O
#define SETCOORD_INITIAL_ZERO 0x200
#define SETCOORD_INITIAL_AUTO 0x400
#define SETCOORD_INITIAL_NONE 0x800
#define SETCOORD_INITIAL_NORMAL 0x1000
#define SETCOORD_INITIAL_HALF 0x2000
#define SETCOORD_INITIAL_HUNDRED_PCT 0x00004000
#define SETCOORD_INITIAL_FACTOR_ONE 0x00008000
#define SETCOORD_INITIAL_FACTOR_ZERO 0x00010000
#define SETCOORD_CALC_LENGTH_ONLY 0x00020000
#define SETCOORD_CALC_CLAMP_NONNEGATIVE 0x00040000 // modifier for CALC_LENGTH_ONLY
#define SETCOORD_STORE_CALC 0x00080000
#define SETCOORD_BOX_POSITION 0x00100000 // exclusive with _ENUMERATED
#define SETCOORD_LP (SETCOORD_LENGTH | SETCOORD_PERCENT)
#define SETCOORD_LH (SETCOORD_LENGTH | SETCOORD_INHERIT)
#define SETCOORD_AH (SETCOORD_AUTO | SETCOORD_INHERIT)
#define SETCOORD_LAH (SETCOORD_AUTO | SETCOORD_LENGTH | SETCOORD_INHERIT)
#define SETCOORD_LPH (SETCOORD_LP | SETCOORD_INHERIT)
#define SETCOORD_LPAH (SETCOORD_LP | SETCOORD_AH)
#define SETCOORD_LPEH (SETCOORD_LP | SETCOORD_ENUMERATED | SETCOORD_INHERIT)
#define SETCOORD_LPAEH (SETCOORD_LPAH | SETCOORD_ENUMERATED)
#define SETCOORD_LPO (SETCOORD_LP | SETCOORD_NONE)
#define SETCOORD_LPOH (SETCOORD_LPH | SETCOORD_NONE)
#define SETCOORD_LPOEH (SETCOORD_LPOH | SETCOORD_ENUMERATED)
#define SETCOORD_LE (SETCOORD_LENGTH | SETCOORD_ENUMERATED)
#define SETCOORD_LEH (SETCOORD_LE | SETCOORD_INHERIT)
#define SETCOORD_IA (SETCOORD_INTEGER | SETCOORD_AUTO)
#define SETCOORD_LAE (SETCOORD_LENGTH | SETCOORD_AUTO | SETCOORD_ENUMERATED)
// changes aCoord iff it returns true
static bool SetCoord(const nsCSSValue& aValue, nsStyleCoord& aCoord,
const nsStyleCoord& aParentCoord,
PRInt32 aMask, nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
bool& aCanStoreInRuleTree)
{
bool result = true;
if (aValue.GetUnit() == eCSSUnit_Null) {
result = false;
}
else if ((((aMask & SETCOORD_LENGTH) != 0) &&
aValue.IsLengthUnit()) ||
(((aMask & SETCOORD_CALC_LENGTH_ONLY) != 0) &&
aValue.IsCalcUnit())) {
nscoord len = CalcLength(aValue, aStyleContext, aPresContext,
aCanStoreInRuleTree);
if ((aMask & SETCOORD_CALC_CLAMP_NONNEGATIVE) && len < 0) {
NS_ASSERTION(aValue.IsCalcUnit(),
"parser should have ensured no nonnegative lengths");
len = 0;
}
aCoord.SetCoordValue(len);
}
else if (((aMask & SETCOORD_PERCENT) != 0) &&
(aValue.GetUnit() == eCSSUnit_Percent)) {
aCoord.SetPercentValue(aValue.GetPercentValue());
}
else if (((aMask & SETCOORD_INTEGER) != 0) &&
(aValue.GetUnit() == eCSSUnit_Integer)) {
aCoord.SetIntValue(aValue.GetIntValue(), eStyleUnit_Integer);
}
else if (((aMask & SETCOORD_ENUMERATED) != 0) &&
(aValue.GetUnit() == eCSSUnit_Enumerated)) {
aCoord.SetIntValue(aValue.GetIntValue(), eStyleUnit_Enumerated);
}
else if (((aMask & SETCOORD_BOX_POSITION) != 0) &&
(aValue.GetUnit() == eCSSUnit_Enumerated)) {
aCoord.SetPercentValue(GetFloatFromBoxPosition(aValue.GetIntValue()));
}
else if (((aMask & SETCOORD_AUTO) != 0) &&
(aValue.GetUnit() == eCSSUnit_Auto)) {
aCoord.SetAutoValue();
}
else if (((aMask & SETCOORD_INHERIT) != 0) &&
(aValue.GetUnit() == eCSSUnit_Inherit)) {
aCoord = aParentCoord; // just inherit value from parent
aCanStoreInRuleTree = false;
}
else if (((aMask & SETCOORD_NORMAL) != 0) &&
(aValue.GetUnit() == eCSSUnit_Normal)) {
aCoord.SetNormalValue();
}
else if (((aMask & SETCOORD_NONE) != 0) &&
(aValue.GetUnit() == eCSSUnit_None)) {
aCoord.SetNoneValue();
}
else if (((aMask & SETCOORD_FACTOR) != 0) &&
(aValue.GetUnit() == eCSSUnit_Number)) {
aCoord.SetFactorValue(aValue.GetFloatValue());
}
else if (((aMask & SETCOORD_STORE_CALC) != 0) &&
(aValue.IsCalcUnit())) {
SpecifiedCalcToComputedCalc(aValue, aCoord, aStyleContext,
aCanStoreInRuleTree);
}
else if (aValue.GetUnit() == eCSSUnit_Initial) {
if ((aMask & SETCOORD_INITIAL_AUTO) != 0) {
aCoord.SetAutoValue();
}
else if ((aMask & SETCOORD_INITIAL_ZERO) != 0) {
aCoord.SetCoordValue(0);
}
else if ((aMask & SETCOORD_INITIAL_FACTOR_ZERO) != 0) {
aCoord.SetFactorValue(0.0f);
}
else if ((aMask & SETCOORD_INITIAL_NONE) != 0) {
aCoord.SetNoneValue();
}
else if ((aMask & SETCOORD_INITIAL_NORMAL) != 0) {
aCoord.SetNormalValue();
}
else if ((aMask & SETCOORD_INITIAL_HALF) != 0) {
aCoord.SetPercentValue(0.5f);
}
else if ((aMask & SETCOORD_INITIAL_HUNDRED_PCT) != 0) {
aCoord.SetPercentValue(1.0f);
}
else if ((aMask & SETCOORD_INITIAL_FACTOR_ONE) != 0) {
aCoord.SetFactorValue(1.0f);
}
else {
result = false; // didn't set anything
}
}
else {
result = false; // didn't set anything
}
return result;
}
// This inline function offers a shortcut for SetCoord() by refusing to accept
// SETCOORD_LENGTH and SETCOORD_INHERIT masks.
static inline bool SetAbsCoord(const nsCSSValue& aValue,
nsStyleCoord& aCoord,
PRInt32 aMask)
{
NS_ABORT_IF_FALSE((aMask & SETCOORD_LH) == 0,
"does not handle SETCOORD_LENGTH and SETCOORD_INHERIT");
// The values of the following variables will never be used; so it does not
// matter what to set.
const nsStyleCoord dummyParentCoord;
nsStyleContext* dummyStyleContext = nsnull;
nsPresContext* dummyPresContext = nsnull;
bool dummyCanStoreInRuleTree = true;
bool rv = SetCoord(aValue, aCoord, dummyParentCoord, aMask,
dummyStyleContext, dummyPresContext,
dummyCanStoreInRuleTree);
NS_ABORT_IF_FALSE(dummyCanStoreInRuleTree,
"SetCoord() should not modify dummyCanStoreInRuleTree.");
return rv;
}
/* Given a specified value that might be a pair value, call SetCoord twice,
* either using each member of the pair, or using the unpaired value twice.
*/
static bool
SetPairCoords(const nsCSSValue& aValue,
nsStyleCoord& aCoordX, nsStyleCoord& aCoordY,
const nsStyleCoord& aParentX, const nsStyleCoord& aParentY,
PRInt32 aMask, nsStyleContext* aStyleContext,
nsPresContext* aPresContext, bool& aCanStoreInRuleTree)
{
const nsCSSValue& valX =
aValue.GetUnit() == eCSSUnit_Pair ? aValue.GetPairValue().mXValue : aValue;
const nsCSSValue& valY =
aValue.GetUnit() == eCSSUnit_Pair ? aValue.GetPairValue().mYValue : aValue;
bool cX = SetCoord(valX, aCoordX, aParentX, aMask, aStyleContext,
aPresContext, aCanStoreInRuleTree);
mozilla::DebugOnly<bool> cY = SetCoord(valY, aCoordY, aParentY, aMask,
aStyleContext, aPresContext, aCanStoreInRuleTree);
NS_ABORT_IF_FALSE(cX == cY, "changed one but not the other");
return cX;
}
static bool SetColor(const nsCSSValue& aValue, const nscolor aParentColor,
nsPresContext* aPresContext, nsStyleContext *aContext,
nscolor& aResult, bool& aCanStoreInRuleTree)
{
bool result = false;
nsCSSUnit unit = aValue.GetUnit();
if (eCSSUnit_Color == unit) {
aResult = aValue.GetColorValue();
result = true;
}
else if (eCSSUnit_Ident == unit) {
nsAutoString value;
aValue.GetStringValue(value);
nscolor rgba;
if (NS_ColorNameToRGB(value, &rgba)) {
aResult = rgba;
result = true;
}
}
else if (eCSSUnit_EnumColor == unit) {
PRInt32 intValue = aValue.GetIntValue();
if (0 <= intValue) {
LookAndFeel::ColorID colorID = (LookAndFeel::ColorID) intValue;
if (NS_SUCCEEDED(LookAndFeel::GetColor(colorID, &aResult))) {
result = true;
}
}
else {
switch (intValue) {
case NS_COLOR_MOZ_HYPERLINKTEXT:
aResult = aPresContext->DefaultLinkColor();
break;
case NS_COLOR_MOZ_VISITEDHYPERLINKTEXT:
aResult = aPresContext->DefaultVisitedLinkColor();
break;
case NS_COLOR_MOZ_ACTIVEHYPERLINKTEXT:
aResult = aPresContext->DefaultActiveLinkColor();
break;
case NS_COLOR_CURRENTCOLOR:
// The data computed from this can't be shared in the rule tree
// because they could be used on a node with a different color
aCanStoreInRuleTree = false;
aResult = aContext->GetStyleColor()->mColor;
break;
case NS_COLOR_MOZ_DEFAULT_COLOR:
aResult = aPresContext->DefaultColor();
break;
case NS_COLOR_MOZ_DEFAULT_BACKGROUND_COLOR:
aResult = aPresContext->DefaultBackgroundColor();
break;
default:
NS_NOTREACHED("Should never have an unknown negative colorID.");
break;
}
result = true;
}
}
else if (eCSSUnit_Inherit == unit) {
aResult = aParentColor;
result = true;
aCanStoreInRuleTree = false;
}
else if (eCSSUnit_Enumerated == unit &&
aValue.GetIntValue() == NS_STYLE_COLOR_INHERIT_FROM_BODY) {
NS_ASSERTION(aPresContext->CompatibilityMode() == eCompatibility_NavQuirks,
"Should only get this value in quirks mode");
// We just grab the color from the prescontext, and rely on the fact that
// if the body color ever changes all its descendants will get new style
// contexts (but NOT necessarily new rulenodes).
aResult = aPresContext->BodyTextColor();
result = true;
aCanStoreInRuleTree = false;
}
return result;
}
static void SetGradientCoord(const nsCSSValue& aValue, nsPresContext* aPresContext,
nsStyleContext* aContext, nsStyleCoord& aResult,
bool& aCanStoreInRuleTree)
{
// OK to pass bad aParentCoord since we're not passing SETCOORD_INHERIT
if (!SetCoord(aValue, aResult, nsStyleCoord(),
SETCOORD_LPO | SETCOORD_BOX_POSITION | SETCOORD_STORE_CALC,
aContext, aPresContext, aCanStoreInRuleTree)) {
NS_NOTREACHED("unexpected unit for gradient anchor point");
aResult.SetNoneValue();
}
}
static void SetGradient(const nsCSSValue& aValue, nsPresContext* aPresContext,
nsStyleContext* aContext, nsStyleGradient& aResult,
bool& aCanStoreInRuleTree)
{
NS_ABORT_IF_FALSE(aValue.GetUnit() == eCSSUnit_Gradient,
"The given data is not a gradient");
nsCSSValueGradient* gradient = aValue.GetGradientValue();
if (gradient->mIsRadial) {
if (gradient->mRadialShape.GetUnit() == eCSSUnit_Enumerated) {
aResult.mShape = gradient->mRadialShape.GetIntValue();
} else {
NS_ASSERTION(gradient->mRadialShape.GetUnit() == eCSSUnit_None,
"bad unit for radial shape");
aResult.mShape = NS_STYLE_GRADIENT_SHAPE_ELLIPTICAL;
}
if (gradient->mRadialSize.GetUnit() == eCSSUnit_Enumerated) {
aResult.mSize = gradient->mRadialSize.GetIntValue();
} else {
NS_ASSERTION(gradient->mRadialSize.GetUnit() == eCSSUnit_None,
"bad unit for radial shape");
aResult.mSize = NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER;
}
} else {
NS_ASSERTION(gradient->mRadialShape.GetUnit() == eCSSUnit_None,
"bad unit for linear shape");
NS_ASSERTION(gradient->mRadialSize.GetUnit() == eCSSUnit_None,
"bad unit for linear size");
aResult.mShape = NS_STYLE_GRADIENT_SHAPE_LINEAR;
aResult.mSize = NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER;
aResult.mToCorner = gradient->mIsToCorner;
}
// bg-position
SetGradientCoord(gradient->mBgPos.mXValue, aPresContext, aContext,
aResult.mBgPosX, aCanStoreInRuleTree);
SetGradientCoord(gradient->mBgPos.mYValue, aPresContext, aContext,
aResult.mBgPosY, aCanStoreInRuleTree);
aResult.mRepeating = gradient->mIsRepeating;
// angle
if (gradient->mAngle.IsAngularUnit()) {
nsStyleUnit unit;
switch (gradient->mAngle.GetUnit()) {
case eCSSUnit_Degree: unit = eStyleUnit_Degree; break;
case eCSSUnit_Grad: unit = eStyleUnit_Grad; break;
case eCSSUnit_Radian: unit = eStyleUnit_Radian; break;
case eCSSUnit_Turn: unit = eStyleUnit_Turn; break;
default: NS_NOTREACHED("unrecognized angular unit");
unit = eStyleUnit_Degree;
}
aResult.mAngle.SetAngleValue(gradient->mAngle.GetAngleValue(), unit);
} else {
NS_ASSERTION(gradient->mAngle.GetUnit() == eCSSUnit_None,
"bad unit for gradient angle");
aResult.mAngle.SetNoneValue();
}
// stops
for (PRUint32 i = 0; i < gradient->mStops.Length(); i++) {
nsStyleGradientStop stop;
nsCSSValueGradientStop &valueStop = gradient->mStops[i];
if (!SetCoord(valueStop.mLocation, stop.mLocation,
nsStyleCoord(), SETCOORD_LPO,
aContext, aPresContext, aCanStoreInRuleTree)) {
NS_NOTREACHED("unexpected unit for gradient stop location");
}
// inherit is not a valid color for stops, so we pass in a dummy
// parent color
NS_ASSERTION(valueStop.mColor.GetUnit() != eCSSUnit_Inherit,
"inherit is not a valid color for gradient stops");
SetColor(valueStop.mColor, NS_RGB(0, 0, 0), aPresContext,
aContext, stop.mColor, aCanStoreInRuleTree);
aResult.mStops.AppendElement(stop);
}
}
// -moz-image-rect(<uri>, <top>, <right>, <bottom>, <left>)
static void SetStyleImageToImageRect(nsStyleContext* aStyleContext,
const nsCSSValue& aValue,
nsStyleImage& aResult)
{
NS_ABORT_IF_FALSE(aValue.GetUnit() == eCSSUnit_Function &&
aValue.EqualsFunction(eCSSKeyword__moz_image_rect),
"the value is not valid -moz-image-rect()");
nsCSSValue::Array* arr = aValue.GetArrayValue();
NS_ABORT_IF_FALSE(arr && arr->Count() == 6, "invalid number of arguments");
// <uri>
if (arr->Item(1).GetUnit() == eCSSUnit_Image) {
NS_SET_IMAGE_REQUEST(aResult.SetImageData,
aStyleContext,
arr->Item(1).GetImageValue())
} else {
NS_WARNING("nsCSSValue::Image::Image() failed?");
}
// <top>, <right>, <bottom>, <left>
nsStyleSides cropRect;
NS_FOR_CSS_SIDES(side) {
nsStyleCoord coord;
const nsCSSValue& val = arr->Item(2 + side);
#ifdef DEBUG
bool unitOk =
#endif
SetAbsCoord(val, coord, SETCOORD_FACTOR | SETCOORD_PERCENT);
NS_ABORT_IF_FALSE(unitOk, "Incorrect data structure created by CSS parser");
cropRect.Set(side, coord);
}
aResult.SetCropRect(&cropRect);
}
static void SetStyleImage(nsStyleContext* aStyleContext,
const nsCSSValue& aValue,
nsStyleImage& aResult,
bool& aCanStoreInRuleTree)
{
aResult.SetNull();
switch (aValue.GetUnit()) {
case eCSSUnit_Image:
NS_SET_IMAGE_REQUEST(aResult.SetImageData,
aStyleContext,
aValue.GetImageValue())
break;
case eCSSUnit_Function:
if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
SetStyleImageToImageRect(aStyleContext, aValue, aResult);
} else {
NS_NOTREACHED("-moz-image-rect() is the only expected function");
}
break;
case eCSSUnit_Gradient:
{
nsStyleGradient* gradient = new nsStyleGradient();
if (gradient) {
SetGradient(aValue, aStyleContext->PresContext(), aStyleContext,
*gradient, aCanStoreInRuleTree);
aResult.SetGradientData(gradient);
}
break;
}
case eCSSUnit_Element:
aResult.SetElementId(aValue.GetStringBufferValue());
break;
case eCSSUnit_None:
break;
default:
// We might have eCSSUnit_URL values for if-visited style
// contexts, which we can safely treat like 'none'. Otherwise
// this is an unexpected unit.
NS_ASSERTION(aStyleContext->IsStyleIfVisited() &&
aValue.GetUnit() == eCSSUnit_URL,
"unexpected unit; maybe nsCSSValue::Image::Image() failed?");
break;
}
}
// flags for SetDiscrete - align values with SETCOORD_* constants
// where possible
#define SETDSC_NORMAL 0x01 // N
#define SETDSC_AUTO 0x02 // A
#define SETDSC_INTEGER 0x40 // I
#define SETDSC_ENUMERATED 0x80 // E
#define SETDSC_NONE 0x100 // O
#define SETDSC_SYSTEM_FONT 0x2000
// no caller cares whether aField was changed or not
template <typename FieldT,
typename T1, typename T2, typename T3, typename T4, typename T5>
static void
SetDiscrete(const nsCSSValue& aValue, FieldT & aField,
bool& aCanStoreInRuleTree, PRUint32 aMask,
FieldT aParentValue,
T1 aInitialValue,
T2 aAutoValue,
T3 aNoneValue,
T4 aNormalValue,
T5 aSystemFontValue)
{
switch (aValue.GetUnit()) {
case eCSSUnit_Null:
return;
// every caller of SetDiscrete provides inherit and initial
// alternatives, so we don't require them to say so in the mask
case eCSSUnit_Inherit:
aCanStoreInRuleTree = false;
aField = aParentValue;
return;
case eCSSUnit_Initial:
aField = aInitialValue;
return;