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Support CSS sizing math functions

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Basilisk-Dev 2026-05-10 14:04:56 -04:00 • committed by wuggy
commit c47cea4ddf
12 changed files with 1234 additions and 28 deletions
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103
layout/style/nsComputedDOMStyle.cpp
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@ -1899,6 +1899,94 @@ nsComputedDOMStyle::DoGetBackgroundColor()
return val.forget();
}
static void
AppendCalcNodeToString(const nsStyleCoord::CalcNode* aNode,
nsROCSSPrimitiveValue* aPrimitive,
nsAString& aResult);
static void
AppendCalcLeafToString(const nsStyleCoord::CalcNode* aNode,
nsROCSSPrimitiveValue* aPrimitive,
nsAString& aResult)
{
nsAutoString tmp;
if (!aNode->mHasPercent) {
aPrimitive->SetAppUnits(aNode->mLength);
aPrimitive->GetCssText(tmp);
aResult.Append(tmp);
return;
}
aResult.AppendLiteral("calc(");
aPrimitive->SetAppUnits(aNode->mLength);
aPrimitive->GetCssText(tmp);
aResult.Append(tmp);
aResult.AppendLiteral(" + ");
aPrimitive->SetPercent(aNode->mPercent);
aPrimitive->GetCssText(tmp);
aResult.Append(tmp);
aResult.Append(')');
}
static void
AppendCalcNodeToString(const nsStyleCoord::CalcNode* aNode,
nsROCSSPrimitiveValue* aPrimitive,
nsAString& aResult)
{
using Type = nsStyleCoord::CalcNode::Type;
switch (aNode->mType) {
case Type::Leaf:
AppendCalcLeafToString(aNode, aPrimitive, aResult);
return;
case Type::Add:
case Type::Subtract:
aResult.AppendLiteral("calc(");
AppendCalcNodeToString(aNode->mChildren[0], aPrimitive, aResult);
aResult.Append(aNode->mType == Type::Add
? NS_LITERAL_STRING(" + ")
: NS_LITERAL_STRING(" - "));
AppendCalcNodeToString(aNode->mChildren[1], aPrimitive, aResult);
aResult.Append(')');
return;
case Type::Multiply:
case Type::Divide: {
nsAutoString tmp;
aResult.AppendLiteral("calc(");
AppendCalcNodeToString(aNode->mChildren[0], aPrimitive, aResult);
aResult.Append(aNode->mType == Type::Multiply
? NS_LITERAL_STRING(" * ")
: NS_LITERAL_STRING(" / "));
aPrimitive->SetNumber(aNode->mNumber);
aPrimitive->GetCssText(tmp);
aResult.Append(tmp);
aResult.Append(')');
return;
}
case Type::Min:
case Type::Max:
case Type::Clamp:
if (aNode->mType == Type::Min) {
aResult.AppendLiteral("min(");
} else if (aNode->mType == Type::Max) {
aResult.AppendLiteral("max(");
} else {
aResult.AppendLiteral("clamp(");
}
for (uint32_t i = 0; i < aNode->mChildren.Length(); ++i) {
if (i != 0) {
aResult.AppendLiteral(", ");
}
AppendCalcNodeToString(aNode->mChildren[i], aPrimitive, aResult);
}
aResult.Append(')');
return;
}
MOZ_ASSERT_UNREACHABLE("unexpected calc node type");
}
static void
SetValueToCalc(const nsStyleCoord::CalcValue* aCalc,
nsROCSSPrimitiveValue* aValue)
@ -1925,6 +2013,21 @@ SetValueToCalc(const nsStyleCoord::CalcValue* aCalc,
aValue->SetString(result); // not really SetString
}
static void
SetValueToCalc(const nsStyleCoord::Calc* aCalc,
nsROCSSPrimitiveValue* aValue)
{
if (!aCalc->HasCalcNode()) {
SetValueToCalc(static_cast<const nsStyleCoord::CalcValue*>(aCalc), aValue);
return;
}
RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
nsAutoString result;
AppendCalcNodeToString(aCalc->mNode, val, result);
aValue->SetString(result); // not really SetString
}
static void
AppendCSSGradientLength(const nsStyleCoord& aValue,
nsROCSSPrimitiveValue* aPrimitive,