gfx/thebes/gfxFontFeatures.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "gfxFontFeatures.h"
   7 #include "nsAtom.h"
   8 #include "nsUnicharUtils.h"
   9 #include "nsHashKeys.h"
  10
  11 using namespace mozilla;
  12
  13 gfxFontFeatureValueSet::gfxFontFeatureValueSet() : mFontFeatureValues(8) {}
  14
  15 Span<const uint32_t> gfxFontFeatureValueSet::GetFontFeatureValuesFor(
  16     const nsACString& aFamily, uint32_t aVariantProperty, nsAtom* aName) const {
  17   nsAutoCString family(aFamily);
  18   ToLowerCase(family);
  19   FeatureValueHashKey key(family, aVariantProperty, aName);
  20   FeatureValueHashEntry* entry = mFontFeatureValues.GetEntry(key);
  21   if (!entry) {
  22     return {};
  23   }
  24   NS_ASSERTION(entry->mValues.Length() > 0,
  25                "null array of font feature values");
  26   return {entry->mValues};
  27 }
  28
  29 nsTArray<uint32_t>* gfxFontFeatureValueSet::AppendFeatureValueHashEntry(
  30     const nsACString& aFamily, nsAtom* aName, uint32_t aAlternate) {
  31   FeatureValueHashKey key(aFamily, aAlternate, aName);
  32   FeatureValueHashEntry* entry = mFontFeatureValues.PutEntry(key);
  33   entry->mKey = key;
  34   return &entry->mValues;
  35 }
  36
  37 bool gfxFontFeatureValueSet::FeatureValueHashEntry::KeyEquals(
  38     const KeyTypePointer aKey) const {
  39   return aKey->mPropVal == mKey.mPropVal && aKey->mName == mKey.mName &&
  40          aKey->mFamily.Equals(mKey.mFamily);
  41 }
  42
  43 PLDHashNumber gfxFontFeatureValueSet::FeatureValueHashEntry::HashKey(
  44     const KeyTypePointer aKey) {
  45   return HashString(aKey->mFamily) + aKey->mName->hash() +
  46          aKey->mPropVal * uint32_t(0xdeadbeef);
  47 }