Method make

snap_drawing/src/snap_drawing/cpp/Text/TextShaperCache.cpp:67–108

    : Valdi::LRUCacheNode<TextShaperCacheKey, TextShaperCacheValue>(std::move(keyValue)) {}

Ref<TextShaperCacheNode> TextShaperCacheNode::make(FontId fontId,
                                                   Scalar letterSpacing,
                                                   TextScript script,
                                                   bool isRightToLeft,
                                                   const Character* characters,
                                                   size_t charactersLength,
                                                   const ShapedGlyph* glyphs,
                                                   size_t glyphsLength,
                                                   size_t hash) {
    /**
     This does a single allocation containing the TextShaperCacheNode structure, the characters array, and the shaped
     glyphs.
     */

    auto charactersAllocSize = charactersLength * sizeof(Character);
    auto glyphsAllocSize = glyphsLength * sizeof(ShapedGlyph);

    auto baseAllocSize = sizeof(TextShaperCacheNode);
    auto withCharactersAllocSize = Valdi::alignUp(baseAllocSize + charactersAllocSize, alignof(Character));
    auto withGlyphsAllocSize = Valdi::alignUp(withCharactersAllocSize + glyphsAllocSize, alignof(ShapedGlyph));

    std::allocator<uint8_t> allocator;
    auto* region = allocator.allocate(withGlyphsAllocSize);

    auto* allocatedCharacters = reinterpret_cast<Character*>(&region[withCharactersAllocSize - charactersAllocSize]);
    auto* allocatedGlyphs = reinterpret_cast<ShapedGlyph*>(&region[withGlyphsAllocSize - glyphsAllocSize]);

    if (characters != nullptr) {
        std::memcpy(allocatedCharacters, characters, charactersAllocSize);
    }
    if (glyphs != nullptr) {
        std::memcpy(allocatedGlyphs, glyphs, glyphsAllocSize);
    }

    auto cacheKey =
        TextShaperCacheKey(fontId, letterSpacing, script, isRightToLeft, allocatedCharacters, charactersLength, hash);
    auto cacheValue = TextShaperCacheValue(allocatedGlyphs, glyphsLength);

    new (region)(TextShaperCacheNode)(std::make_pair(cacheKey, cacheValue));

    return Ref<TextShaperCacheNode>(reinterpret_cast<TextShaperCacheNode*>(region));
}

TextShaperCache::TextShaperCache(size_t capacity) : _cache(capacity) {}