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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */
#include "nsAtom.h"
#include "nsTHashtable.h"
#include "nsTArray.h"
#include "nsString.h"
// An OpenType feature tag and value pair
struct gfxFontFeature {
uint32_t mValue; // 0 = off, 1 = on, larger values may be used as parameters
// to features that select among multiple alternatives
inline bool operator<(const gfxFontFeature& a, const gfxFontFeature& b) {
return (a.mTag < b.mTag) || ((a.mTag == b.mTag) && (a.mValue < b.mValue));
inline bool operator==(const gfxFontFeature& a, const gfxFontFeature& b) {
return (a.mTag == b.mTag) && (a.mValue == b.mValue);
class nsAtom;
class gfxFontFeatureValueSet final {
struct ValueList {
ValueList(const nsAString& aName, const nsTArray<uint32_t>& aSelectors)
: name(aName), featureSelectors(aSelectors.Clone()) {}
nsString name;
nsTArray<uint32_t> featureSelectors;
struct FeatureValues {
uint32_t alternate;
nsTArray<ValueList> valuelist;
mozilla::Span<const uint32_t> GetFontFeatureValuesFor(
const nsACString& aFamily, uint32_t aVariantProperty,
nsAtom* aName) const;
// Appends a new hash entry with given key values and returns a pointer to
// mValues array to fill. This should be filled first.
nsTArray<uint32_t>* AppendFeatureValueHashEntry(const nsACString& aFamily,
nsAtom* aName,
uint32_t aAlternate);
// Private destructor, to discourage deletion outside of Release():
~gfxFontFeatureValueSet() = default;
struct FeatureValueHashKey {
nsCString mFamily;
uint32_t mPropVal;
RefPtr<nsAtom> mName;
FeatureValueHashKey() : mPropVal(0) {}
FeatureValueHashKey(const nsACString& aFamily, uint32_t aPropVal,
nsAtom* aName)
: mFamily(aFamily), mPropVal(aPropVal), mName(aName) {}
FeatureValueHashKey(const FeatureValueHashKey& aKey) = default;
class FeatureValueHashEntry : public PLDHashEntryHdr {
typedef const FeatureValueHashKey& KeyType;
typedef const FeatureValueHashKey* KeyTypePointer;
explicit FeatureValueHashEntry(KeyTypePointer aKey) {}
FeatureValueHashEntry(FeatureValueHashEntry&& other)
: PLDHashEntryHdr(std::move(other)),
mValues(std::move(other.mValues)) {
NS_ERROR("Should not be called");
~FeatureValueHashEntry() = default;
bool KeyEquals(const KeyTypePointer aKey) const;
static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
static PLDHashNumber HashKey(const KeyTypePointer aKey);
enum { ALLOW_MEMMOVE = true };
FeatureValueHashKey mKey;
nsTArray<uint32_t> mValues;
nsTHashtable<FeatureValueHashEntry> mFontFeatureValues;