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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_FONT_FEATURES_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_FONT_FEATURES_H_
#include <optional>
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
struct hb_feature_t;
namespace blink {
class FontDescription;
//
// Represents an OpenType font feature tag.
//
// This struct is compatible with `hb_tag_t`.
//
struct PLATFORM_EXPORT FontFeatureTag {
constexpr FontFeatureTag() = default;
constexpr FontFeatureTag(uint32_t tag) : tag(tag) {}
constexpr FontFeatureTag(uint8_t c1, uint8_t c2, uint8_t c3, uint8_t c4)
: tag((((((static_cast<uint32_t>(c1) << 8) | c2) << 8) | c3) << 8) | c4) {
}
operator uint32_t() const { return tag; }
uint32_t tag = 0;
};
//
// Represents an OpenType font feature with its value.
//
struct PLATFORM_EXPORT FontFeatureValue : public FontFeatureTag {
uint32_t value = 0;
};
//
// Represents an OpenType font feature with its value and text range.
//
struct PLATFORM_EXPORT FontFeatureRange : public FontFeatureValue {
// The size produced by `FromFontDescription()` for the initial style.
static constexpr wtf_size_t kInitialSize = 1;
// Initialize the list from |FontDescription|.
template <wtf_size_t InlineCapacity>
static void FromFontDescription(const FontDescription&,
Vector<FontFeatureRange, InlineCapacity>&);
// True if the list is for the initial style.
static bool IsInitial(base::span<const FontFeatureRange>);
// This struct has the same size and layout as `hb_feature_t`.
static const hb_feature_t* ToHarfBuzzData(const FontFeatureRange* features) {
return reinterpret_cast<const hb_feature_t*>(features);
}
uint32_t start = 0;
uint32_t end = static_cast<uint32_t>(-1);
};
//
// Represents a list of `FontFeatureRange`.
//
using FontFeatures = Vector<FontFeatureRange, 6>;
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_FONT_FEATURES_H_
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