/**
* Tries to call |nsCSSValue::StartImageLoad()| on an image source.
* Image sources are specified by |url()| or |-moz-image-rect()| function.
*/
static void
TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument,
nsCSSValueTokenStream* aTokenStream)
{
MOZ_ASSERT(aDocument);
if (aValue.GetUnit() == eCSSUnit_URL) {
aValue.StartImageLoad(aDocument);
if (aTokenStream) {
aTokenStream->mImageValues.PutEntry(aValue.GetImageStructValue());
}
}
else if (aValue.GetUnit() == eCSSUnit_Image) {
// If we already have a request, see if this document needs to clone it.
imgIRequest* request = aValue.GetImageValue(nullptr);
if (request) {
mozilla::css::ImageValue* imageValue = aValue.GetImageStructValue();
aDocument->StyleImageLoader()->MaybeRegisterCSSImage(imageValue);
if (aTokenStream) {
aTokenStream->mImageValues.PutEntry(imageValue);
}
}
}
else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
nsCSSValue::Array* arguments = aValue.GetArrayValue();
MOZ_ASSERT(arguments->Count() == 6, "unexpected num of arguments");
const nsCSSValue& image = arguments->Item(1);
TryToStartImageLoadOnValue(image, aDocument, aTokenStream);
}
}
/**
* Tries to call |nsCSSValue::StartImageLoad()| on an image source.
* Image sources are specified by |url()| or |-moz-image-rect()| function.
*/
static void
TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument,
nsStyleContext* aContext, nsCSSProperty aProperty,
bool aForTokenStream)
{
MOZ_ASSERT(aDocument);
if (aValue.GetUnit() == eCSSUnit_URL) {
aValue.StartImageLoad(aDocument);
if (aForTokenStream && aContext) {
CSSVariableImageTable::Add(aContext, aProperty,
aValue.GetImageStructValue());
}
}
else if (aValue.GetUnit() == eCSSUnit_Image) {
// If we already have a request, see if this document needs to clone it.
imgIRequest* request = aValue.GetImageValue(nullptr);
if (request) {
ImageValue* imageValue = aValue.GetImageStructValue();
aDocument->StyleImageLoader()->MaybeRegisterCSSImage(imageValue);
if (aForTokenStream && aContext) {
CSSVariableImageTable::Add(aContext, aProperty, imageValue);
}
}
}
else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
nsCSSValue::Array* arguments = aValue.GetArrayValue();
MOZ_ASSERT(arguments->Count() == 6, "unexpected num of arguments");
const nsCSSValue& image = arguments->Item(1);
TryToStartImageLoadOnValue(image, aDocument, aContext, aProperty,
aForTokenStream);
}
}
/* static */ nscoord
nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
const nsCSSValue& aCSSValue,
float aFontSizeInflation)
{
NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
if (aCSSValue.IsFixedLengthUnit()) {
return aCSSValue.GetFixedLength(aPresContext);
}
if (aCSSValue.IsPixelLengthUnit()) {
return aCSSValue.GetPixelLength();
}
nsCSSUnit unit = aCSSValue.GetUnit();
if (eCSSUnit_EM == unit) {
const nsStyleFont* font = aStyleContext->StyleFont();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
}
else if (eCSSUnit_XHeight == unit) {
aPresContext->SetUsesExChUnits(true);
RefPtr<nsFontMetrics> fm = nsLayoutUtils::
GetFontMetricsForStyleContext(aStyleContext, aFontSizeInflation);
nscoord xHeight = fm->XHeight();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
}
// MathML doesn't specify other CSS units such as rem or ch
NS_ERROR("Unsupported unit");
return 0;
}
static void
ProcessTranslatePart(float& aResult,
const nsCSSValue& aValue,
nsStyleContext* aContext,
nsPresContext* aPresContext,
PRBool& aCanStoreInRuleTree,
nscoord aSize, float aAppUnitsPerMatrixUnit)
{
nscoord offset = 0;
float percent = 0.0f;
if (aValue.GetUnit() == eCSSUnit_Percent) {
percent = aValue.GetPercentValue();
} else if (aValue.IsCalcUnit()) {
nsRuleNode::ComputedCalc result =
nsRuleNode::SpecifiedCalcToComputedCalc(aValue, aContext, aPresContext,
aCanStoreInRuleTree);
percent = result.mPercent;
offset = result.mLength;
} else {
offset = CalcLength(aValue, aContext, aPresContext,
aCanStoreInRuleTree);
}
aResult = (percent * NSAppUnitsToFloatPixels(aSize, aAppUnitsPerMatrixUnit)) +
NSAppUnitsToFloatPixels(offset, aAppUnitsPerMatrixUnit);
}
/* static */ nscoord
nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
const nsCSSValue& aCSSValue)
{
NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
if (aCSSValue.IsFixedLengthUnit()) {
return aCSSValue.GetLengthTwips();
}
nsCSSUnit unit = aCSSValue.GetUnit();
if (eCSSUnit_Pixel == unit) {
return NSFloatPixelsToTwips(aCSSValue.GetFloatValue(),
aPresContext->ScaledPixelsToTwips());
}
else if (eCSSUnit_EM == unit) {
const nsStyleFont* font = aStyleContext->GetStyleFont();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
}
else if (eCSSUnit_XHeight == unit) {
nscoord xHeight;
const nsStyleFont* font = aStyleContext->GetStyleFont();
nsCOMPtr<nsIFontMetrics> fm = aPresContext->GetMetricsFor(font->mFont);
fm->GetXHeight(xHeight);
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
}
return 0;
}
float
ProcessTranslatePart(const nsCSSValue& aValue,
nsStyleContext* aContext,
nsPresContext* aPresContext,
RuleNodeCacheConditions& aConditions,
TransformReferenceBox* aRefBox,
TransformReferenceBox::DimensionGetter aDimensionGetter)
{
nscoord offset = 0;
float percent = 0.0f;
if (aValue.GetUnit() == eCSSUnit_Percent) {
percent = aValue.GetPercentValue();
} else if (aValue.GetUnit() == eCSSUnit_Pixel ||
aValue.GetUnit() == eCSSUnit_Number) {
// Handle this here (even though nsRuleNode::CalcLength handles it
// fine) so that callers are allowed to pass a null style context
// and pres context to SetToTransformFunction if they know (as
// StyleAnimationValue does) that all lengths within the transform
// function have already been computed to pixels and percents.
//
// Raw numbers are treated as being pixels.
//
// Don't convert to aValue to AppUnits here to avoid precision issues.
return aValue.GetFloatValue();
} else if (aValue.IsCalcUnit()) {
nsRuleNode::ComputedCalc result =
nsRuleNode::SpecifiedCalcToComputedCalc(aValue, aContext, aPresContext,
aConditions);
percent = result.mPercent;
offset = result.mLength;
} else {
offset = nsRuleNode::CalcLength(aValue, aContext, aPresContext,
aConditions);
}
float translation = NSAppUnitsToFloatPixels(offset,
nsPresContext::AppUnitsPerCSSPixel());
// We want to avoid calling aDimensionGetter if there's no percentage to be
// resolved (for performance reasons - see TransformReferenceBox).
if (percent != 0.0f && aRefBox) {
translation += percent *
NSAppUnitsToFloatPixels((aRefBox->*aDimensionGetter)(),
nsPresContext::AppUnitsPerCSSPixel());
}
return translation;
}
static void
TryToStartImageLoad(const nsCSSValue& aValue, nsIDocument* aDocument,
nsCSSProperty aProperty)
{
if (aValue.GetUnit() == eCSSUnit_List) {
for (const nsCSSValueList* l = aValue.GetListValue(); l; l = l->mNext) {
TryToStartImageLoad(l->mValue, aDocument, aProperty);
}
} else if (nsCSSProps::PropHasFlags(aProperty,
CSS_PROPERTY_IMAGE_IS_IN_ARRAY_0)) {
if (aValue.GetUnit() == eCSSUnit_Array) {
TryToStartImageLoadOnValue(aValue.GetArrayValue()->Item(0), aDocument);
}
} else {
TryToStartImageLoadOnValue(aValue, aDocument);
}
}
float
ProcessTranslatePart(const nsCSSValue& aValue,
nsStyleContext* aContext,
nsPresContext* aPresContext,
bool& aCanStoreInRuleTree,
nscoord aSize)
{
nscoord offset = 0;
float percent = 0.0f;
if (aValue.GetUnit() == eCSSUnit_Percent) {
percent = aValue.GetPercentValue();
} else if (aValue.GetUnit() == eCSSUnit_Pixel ||
aValue.GetUnit() == eCSSUnit_Number) {
// Handle this here (even though nsRuleNode::CalcLength handles it
// fine) so that callers are allowed to pass a null style context
// and pres context to SetToTransformFunction if they know (as
// StyleAnimationValue does) that all lengths within the transform
// function have already been computed to pixels and percents.
//
// Raw numbers are treated as being pixels.
//
// Don't convert to aValue to AppUnits here to avoid precision issues.
return aValue.GetFloatValue();
} else if (aValue.IsCalcUnit()) {
nsRuleNode::ComputedCalc result =
nsRuleNode::SpecifiedCalcToComputedCalc(aValue, aContext, aPresContext,
aCanStoreInRuleTree);
percent = result.mPercent;
offset = result.mLength;
} else {
offset = nsRuleNode::CalcLength(aValue, aContext, aPresContext,
aCanStoreInRuleTree);
}
return (percent * NSAppUnitsToFloatPixels(aSize, nsPresContext::AppUnitsPerCSSPixel())) +
NSAppUnitsToFloatPixels(offset, nsPresContext::AppUnitsPerCSSPixel());
}
void
nsMathMLmpaddedFrame::UpdateValue(int32_t aSign,
int32_t aPseudoUnit,
const nsCSSValue& aCSSValue,
const ReflowOutput& aDesiredSize,
nscoord& aValueToUpdate,
float aFontSizeInflation) const
{
nsCSSUnit unit = aCSSValue.GetUnit();
if (NS_MATHML_SIGN_INVALID != aSign && eCSSUnit_Null != unit) {
nscoord scaler = 0, amount = 0;
if (eCSSUnit_Percent == unit || eCSSUnit_Number == unit) {
switch(aPseudoUnit) {
case NS_MATHML_PSEUDO_UNIT_WIDTH:
scaler = aDesiredSize.Width();
break;
case NS_MATHML_PSEUDO_UNIT_HEIGHT:
scaler = aDesiredSize.BlockStartAscent();
break;
case NS_MATHML_PSEUDO_UNIT_DEPTH:
scaler = aDesiredSize.Height() - aDesiredSize.BlockStartAscent();
break;
default:
// if we ever reach here, it would mean something is wrong
// somewhere with the setup and/or the caller
NS_ERROR("Unexpected Pseudo Unit");
return;
}
}
if (eCSSUnit_Number == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetFloatValue());
else if (eCSSUnit_Percent == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetPercentValue());
else
amount = CalcLength(PresContext(), mStyleContext, aCSSValue,
aFontSizeInflation);
if (NS_MATHML_SIGN_PLUS == aSign)
aValueToUpdate += amount;
else if (NS_MATHML_SIGN_MINUS == aSign)
aValueToUpdate -= amount;
else
aValueToUpdate = amount;
}
}
void
nsMathMLmpaddedFrame::UpdateValue(PRInt32 aSign,
PRInt32 aPseudoUnit,
const nsCSSValue& aCSSValue,
const nsBoundingMetrics& aBoundingMetrics,
nscoord& aValueToUpdate) const
{
nsCSSUnit unit = aCSSValue.GetUnit();
if (NS_MATHML_SIGN_INVALID != aSign && eCSSUnit_Null != unit) {
nscoord scaler = 0, amount = 0;
if (eCSSUnit_Percent == unit || eCSSUnit_Number == unit) {
switch(aPseudoUnit) {
case NS_MATHML_PSEUDO_UNIT_WIDTH:
scaler = aBoundingMetrics.width;
break;
case NS_MATHML_PSEUDO_UNIT_HEIGHT:
scaler = aBoundingMetrics.ascent;
break;
case NS_MATHML_PSEUDO_UNIT_DEPTH:
scaler = aBoundingMetrics.descent;
break;
default:
// if we ever reach here, it would mean something is wrong
// somewhere with the setup and/or the caller
NS_ERROR("Unexpected Pseudo Unit");
return;
}
}
if (eCSSUnit_Number == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetFloatValue());
else if (eCSSUnit_Percent == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetPercentValue());
else
amount = CalcLength(PresContext(), mStyleContext, aCSSValue);
nscoord oldValue = aValueToUpdate;
if (NS_MATHML_SIGN_PLUS == aSign)
aValueToUpdate += amount;
else if (NS_MATHML_SIGN_MINUS == aSign)
aValueToUpdate -= amount;
else
aValueToUpdate = amount;
}
}
/**
* Tries to call |nsCSSValue::StartImageLoad()| on an image source.
* Image sources are specified by |url()| or |-moz-image-rect()| function.
*/
static void
TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument)
{
if (aValue.GetUnit() == eCSSUnit_URL) {
aValue.StartImageLoad(aDocument);
}
else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
nsCSSValue::Array* arguments = aValue.GetArrayValue();
NS_ABORT_IF_FALSE(arguments->Count() == 6, "unexpected num of arguments");
const nsCSSValue& image = arguments->Item(1);
if (image.GetUnit() == eCSSUnit_URL)
image.StartImageLoad(aDocument);
}
}
/* Helper function to fill in an nscoord with the specified nsCSSValue. */
static nscoord CalcLength(const nsCSSValue &aValue,
nsStyleContext* aContext,
nsPresContext* aPresContext,
PRBool &aCanStoreInRuleTree)
{
if (aValue.GetUnit() == eCSSUnit_Pixel) {
// Handle this here (even though nsRuleNode::CalcLength handles it
// fine) so that callers are allowed to pass a null style context
// and pres context to SetToTransformFunction if they know (as
// nsStyleAnimation does) that all lengths within the transform
// function have already been computed to pixels and percents.
return nsPresContext::CSSPixelsToAppUnits(aValue.GetFloatValue());
}
return nsRuleNode::CalcLength(aValue, aContext, aPresContext,
aCanStoreInRuleTree);
}
void nsCSSValue::SetTripletValue(const nsCSSValue& xValue,
const nsCSSValue& yValue,
const nsCSSValue& zValue)
{
// Only allow Null for the z component
NS_ABORT_IF_FALSE(xValue.GetUnit() != eCSSUnit_Null &&
yValue.GetUnit() != eCSSUnit_Null &&
xValue.GetUnit() != eCSSUnit_Inherit &&
yValue.GetUnit() != eCSSUnit_Inherit &&
zValue.GetUnit() != eCSSUnit_Inherit &&
xValue.GetUnit() != eCSSUnit_Initial &&
yValue.GetUnit() != eCSSUnit_Initial &&
zValue.GetUnit() != eCSSUnit_Initial,
"inappropriate triplet value");
Reset();
mUnit = eCSSUnit_Triplet;
mValue.mTriplet = new nsCSSValueTriplet_heap(xValue, yValue, zValue);
mValue.mTriplet->AddRef();
}
void nsCSSValue::SetPairValue(const nsCSSValue& xValue,
const nsCSSValue& yValue)
{
NS_ABORT_IF_FALSE(xValue.GetUnit() != eCSSUnit_Null &&
yValue.GetUnit() != eCSSUnit_Null &&
xValue.GetUnit() != eCSSUnit_Inherit &&
yValue.GetUnit() != eCSSUnit_Inherit &&
xValue.GetUnit() != eCSSUnit_Initial &&
yValue.GetUnit() != eCSSUnit_Initial,
"inappropriate pair value");
Reset();
mUnit = eCSSUnit_Pair;
mValue.mPair = new nsCSSValuePair_heap(xValue, yValue);
mValue.mPair->AddRef();
}
void
nsMathMLmpaddedFrame::UpdateValue(PRInt32 aSign,
PRInt32 aPseudoUnit,
const nsCSSValue& aCSSValue,
nscoord aLeftSpace,
const nsBoundingMetrics& aBoundingMetrics,
nscoord& aValueToUpdate) const
{
nsCSSUnit unit = aCSSValue.GetUnit();
if (NS_MATHML_SIGN_INVALID != aSign && eCSSUnit_Null != unit) {
nscoord scaler = 0, amount = 0;
if (eCSSUnit_Percent == unit || eCSSUnit_Number == unit) {
switch(aPseudoUnit) {
case NS_MATHML_PSEUDO_UNIT_WIDTH:
scaler = aBoundingMetrics.width;
break;
case NS_MATHML_PSEUDO_UNIT_HEIGHT:
scaler = aBoundingMetrics.ascent;
break;
case NS_MATHML_PSEUDO_UNIT_DEPTH:
scaler = aBoundingMetrics.descent;
break;
case NS_MATHML_PSEUDO_UNIT_LSPACE:
scaler = aLeftSpace;
break;
default:
// if we ever reach here, it would mean something is wrong
// somewhere with the setup and/or the caller
NS_ASSERTION(0, "Unexpected Pseudo Unit");
return;
}
}
if (eCSSUnit_Number == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetFloatValue());
else if (eCSSUnit_Percent == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetPercentValue());
else
amount = CalcLength(PresContext(), mStyleContext, aCSSValue);
nscoord oldValue = aValueToUpdate;
if (NS_MATHML_SIGN_PLUS == aSign)
aValueToUpdate += amount;
else if (NS_MATHML_SIGN_MINUS == aSign)
aValueToUpdate -= amount;
else
aValueToUpdate = amount;
/* The REC says:
Dimensions that would be positive if the content was rendered normally
cannot be made negative using <mpadded>; a positive dimension is set
to 0 if it would otherwise become negative. Dimensions which are
initially 0 can be made negative
*/
if (0 < oldValue && 0 > aValueToUpdate)
aValueToUpdate = 0;
}
}
/**
* Tries to call |nsCSSValue::StartImageLoad()| on an image source.
* Image sources are specified by |url()| or |-moz-image-rect()| function.
*/
static void
TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument,
nsStyleContext* aContext, nsCSSPropertyID aProperty,
bool aForTokenStream)
{
MOZ_ASSERT(aDocument);
if (aValue.GetUnit() == eCSSUnit_URL) {
#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
// The 'mask-image' property accepts local reference URIs.
// For example,
// mask-image: url(#mask_id); // refer to a SVG mask element, whose id is
// // "mask_id", in the current document.
// For such 'mask-image' values (pointing to an in-document element),
// there is no need to trigger image download.
if (aProperty == eCSSProperty_mask_image) {
// Filter out all fragment URLs.
// Since nsCSSValue::GetURLStructValue runs much faster than
// nsIURI::EqualsExceptRef bellow, we get performance gain by this
// early return.
URLValue* urlValue = aValue.GetURLStructValue();
if (urlValue->GetLocalURLFlag()) {
return;
}
// Even though urlValue is not a fragment URL, it might still refer to
// an internal resource.
// For example, aDocument base URL is "http://foo/index.html" and
// intentionally references a mask-image at
// url(http://foo/index.html#mask) which still refers to a resource in
// aDocument.
nsIURI* imageURI = aValue.GetURLValue();
if (imageURI) {
nsIURI* docURI = aDocument->GetDocumentURI();
bool isEqualExceptRef = false;
nsresult rv = imageURI->EqualsExceptRef(docURI, &isEqualExceptRef);
if (NS_SUCCEEDED(rv) && isEqualExceptRef) {
return;
}
}
}
#endif
aValue.StartImageLoad(aDocument);
if (aForTokenStream && aContext) {
CSSVariableImageTable::Add(aContext, aProperty,
aValue.GetImageStructValue());
}
}
else if (aValue.GetUnit() == eCSSUnit_Image) {
// If we already have a request, see if this document needs to clone it.
imgIRequest* request = aValue.GetImageValue(nullptr);
if (request) {
ImageValue* imageValue = aValue.GetImageStructValue();
aDocument->StyleImageLoader()->MaybeRegisterCSSImage(imageValue);
if (aForTokenStream && aContext) {
CSSVariableImageTable::Add(aContext, aProperty, imageValue);
}
}
}
else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
nsCSSValue::Array* arguments = aValue.GetArrayValue();
MOZ_ASSERT(arguments->Count() == 6, "unexpected num of arguments");
const nsCSSValue& image = arguments->Item(1);
TryToStartImageLoadOnValue(image, aDocument, aContext, aProperty,
aForTokenStream);
}
}
