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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 http://mozilla.org/MPL/2.0/. */
#ifndef FONT_PALETTE_CACHE_H
#define FONT_PALETTE_CACHE_H
#include "mozilla/gfx/Types.h"
#include "mozilla/MruCache.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/RefPtr.h"
#include "nsAtom.h"
#include "nsTArray.h"
#include <utility>
class gfxFontEntry;
namespace mozilla::gfx {
class FontPaletteValueSet;
// A resolved font palette as an array of colors.
class FontPalette {
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FontPalette);
public:
FontPalette() = default;
explicit FontPalette(nsTArray<mozilla::gfx::sRGBColor>&& aColors)
: mColors(std::move(aColors)) {}
const nsTArray<mozilla::gfx::sRGBColor>* Colors() const { return &mColors; }
private:
~FontPalette() = default;
nsTArray<mozilla::gfx::sRGBColor> mColors;
};
// MRU cache used for resolved color-font palettes, to avoid reconstructing
// the palette for each glyph rendered with a given font.
using CacheKey = std::pair<RefPtr<gfxFontEntry>, RefPtr<nsAtom>>;
struct CacheData {
CacheKey mKey;
RefPtr<FontPalette> mPalette;
};
class PaletteCache
: public mozilla::MruCache<CacheKey, CacheData, PaletteCache> {
public:
explicit PaletteCache(const FontPaletteValueSet* aPaletteValueSet = nullptr)
: mPaletteValueSet(aPaletteValueSet) {}
void SetPaletteValueSet(const FontPaletteValueSet* aSet);
already_AddRefed<FontPalette> GetPaletteFor(gfxFontEntry* aFontEntry,
nsAtom* aPaletteName);
static mozilla::HashNumber Hash(const CacheKey& aKey) {
return mozilla::HashGeneric(aKey.first.get(), aKey.second.get());
}
static bool Match(const CacheKey& aKey, const CacheData& aVal) {
return aVal.mKey == aKey;
}
protected:
const FontPaletteValueSet* mPaletteValueSet = nullptr;
};
} // namespace mozilla::gfx
#endif
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