DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (72ee4800d415)

VCS Links

FeatureValueHashEntry

FeatureValueHashKey

FeatureValues

ValueList

gfxAlternateValue

gfxFontFeature

gfxFontFeatureValueSet

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133
/* -*- 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_THREADSAFE_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);

    // 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 nsAString& aFamily,
                                const nsAString& aName,
                                uint32_t aAlternate);

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