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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
#ifndef GFX_FONT_FEATURES_H
#define GFX_FONT_FEATURES_H
#include "nsTHashtable.h"
#include "nsTArray.h"
#include "nsString.h"
// An OpenType feature tag and value pair
struct gfxFontFeature {
uint32_t mTag; // see http://www.microsoft.com/typography/otspec/featuretags.htm
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);
}
struct gfxAlternateValue {
uint32_t alternate; // constants in gfxFontConstants.h
nsString value; // string value to be looked up
};
inline bool
operator<(const gfxAlternateValue& a, const gfxAlternateValue& b)
{
return (a.alternate < b.alternate) ||
((a.alternate == b.alternate) && (a.value < b.value));
}
inline bool
operator==(const gfxAlternateValue& a, const gfxAlternateValue& b)
{
return (a.alternate == b.alternate) && (a.value == b.value);
}
class gfxFontFeatureValueSet final {
public:
NS_INLINE_DECL_REFCOUNTING(gfxFontFeatureValueSet)
gfxFontFeatureValueSet();
struct ValueList {
ValueList(const nsAString& aName, const nsTArray<uint32_t>& aSelectors)
: name(aName), featureSelectors(aSelectors)
{}
nsString name;
nsTArray<uint32_t> featureSelectors;
};
struct FeatureValues {
uint32_t alternate;
nsTArray<ValueList> valuelist;
};
// returns true if found, false otherwise
bool
GetFontFeatureValuesFor(const nsAString& aFamily,
uint32_t aVariantProperty,
const nsAString& aName,
nsTArray<uint32_t>& aValues);
void
AddFontFeatureValues(const nsAString& aFamily,
const nsTArray<gfxFontFeatureValueSet::FeatureValues>& aValues);
private:
// Private destructor, to discourage deletion outside of Release():
~gfxFontFeatureValueSet() {}
struct FeatureValueHashKey {
nsString mFamily;
uint32_t mPropVal;
nsString mName;
FeatureValueHashKey()
: mPropVal(0)
{ }
FeatureValueHashKey(const nsAString& aFamily,
uint32_t aPropVal,
const nsAString& aName)
: mFamily(aFamily), mPropVal(aPropVal), mName(aName)
{ }
FeatureValueHashKey(const FeatureValueHashKey& aKey)
: mFamily(aKey.mFamily), mPropVal(aKey.mPropVal), mName(aKey.mName)
{ }
};
class FeatureValueHashEntry : public PLDHashEntryHdr {
public:
typedef const FeatureValueHashKey &KeyType;
typedef const FeatureValueHashKey *KeyTypePointer;
explicit FeatureValueHashEntry(KeyTypePointer aKey) { }
FeatureValueHashEntry(const FeatureValueHashEntry& toCopy)
{
NS_ERROR("Should not be called");
}
~FeatureValueHashEntry() { }
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;
};
#endif
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