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// Copyright 2016 The Chromium Authors. All rights reserved.
// 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_OPENTYPE_OPEN_TYPE_CAPS_SUPPORT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_OPENTYPE_OPEN_TYPE_CAPS_SUPPORT_H_
#include "third_party/blink/renderer/platform/fonts/font_description.h"
#include "third_party/blink/renderer/platform/fonts/opentype/open_type_caps_support.h"
#include "third_party/blink/renderer/platform/fonts/shaping/case_mapping_harfbuzz_buffer_filler.h"
#include "third_party/blink/renderer/platform/fonts/shaping/harfbuzz_face.h"
#include "third_party/blink/renderer/platform/fonts/small_caps_iterator.h"
#include <hb.h>
namespace blink {
class PLATFORM_EXPORT OpenTypeCapsSupport {
public:
OpenTypeCapsSupport();
OpenTypeCapsSupport(const HarfBuzzFace*,
FontDescription::FontVariantCaps requested_caps,
hb_script_t);
bool NeedsRunCaseSplitting();
bool NeedsSyntheticFont(SmallCapsIterator::SmallCapsBehavior run_case);
FontDescription::FontVariantCaps FontFeatureToUse(
SmallCapsIterator::SmallCapsBehavior run_case);
CaseMapIntend NeedsCaseChange(SmallCapsIterator::SmallCapsBehavior run_case);
private:
enum class FontFormat { kUndetermined, kOpenType, kAat };
// Lazily intializes font_format_ when needed and returns the format of the
// underlying HarfBuzzFace/Font.
FontFormat GetFontFormat() const;
void DetermineFontSupport(hb_script_t);
bool SupportsFeature(hb_script_t, uint32_t tag) const;
bool SupportsAatFeature(uint32_t tag) const;
bool SupportsOpenTypeFeature(hb_script_t, uint32_t tag) const;
const HarfBuzzFace* harfbuzz_face_;
FontDescription::FontVariantCaps requested_caps_;
enum class FontSupport {
kFull,
kFallback, // Fall back to 'smcp' or 'smcp' + 'c2sc'
kNone
};
enum class CapsSynthesis {
kNone,
kLowerToSmallCaps,
kUpperToSmallCaps,
kBothToSmallCaps
};
FontSupport font_support_;
CapsSynthesis caps_synthesis_;
mutable FontFormat font_format_;
};
}; // namespace blink
#endif
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