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/*
* Copyright (c) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARFBUZZ_FACE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARFBUZZ_FACE_H_
#include "third_party/blink/renderer/platform/fonts/font_variant_emoji.h"
#include "third_party/blink/renderer/platform/fonts/glyph.h"
#include "third_party/blink/renderer/platform/fonts/shaping/variation_selector_mode.h"
#include "third_party/blink/renderer/platform/fonts/typesetting_features.h"
#include "third_party/blink/renderer/platform/fonts/unicode_range_set.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#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/text/character_names.h"
#include <hb.h>
#include <hb-cplusplus.hh>
namespace blink {
class FontPlatformData;
class OpenTypeVerticalData;
struct HarfBuzzFontData;
// |HarfBuzzFace| is a thread specific data associated to |FontPlatformData|,
// hold by |HarfBuzzFontCache|.
class PLATFORM_EXPORT HarfBuzzFace final
: public GarbageCollected<HarfBuzzFace> {
public:
HarfBuzzFace(const FontPlatformData* platform_data, uint64_t);
HarfBuzzFace(const HarfBuzzFace&) = delete;
HarfBuzzFace& operator=(const HarfBuzzFace&) = delete;
void Trace(Visitor*) const;
enum VerticalLayoutCallbacks { kPrepareForVerticalLayout, kNoVerticalLayout };
// In order to support the restricting effect of unicode-range optionally a
// range restriction can be passed in, which will restrict which glyphs we
// return in the harfBuzzGetGlyph function.
// Passing in specified_size in order to control selecting the right value
// from the trak table. If not set, the size of the internal FontPlatformData
// object will be used.
hb_font_t* GetScaledFont(const UnicodeRangeSet*,
VerticalLayoutCallbacks,
float specified_size) const;
// Returns `hb_font_t` as same as `GetScaledFont()` with null
// `UnicodeRangeSet`, `HarfBuzzFace::kNoVerticalLayout`, and
// `platform_data_.size()`.
hb_font_t* GetScaledFont() const;
bool HasSpaceInLigaturesOrKerning(TypesettingFeatures);
unsigned UnitsPerEmFromHeadTable();
Glyph HbGlyphForCharacter(UChar32 character);
hb_codepoint_t HarfBuzzGetGlyphForTesting(UChar32 character,
UChar32 variation_selector);
bool ShouldSubpixelPosition();
const OpenTypeVerticalData& VerticalData() const;
static void Init();
static VariationSelectorMode GetVariationSelectorMode();
static void SetVariationSelectorMode(VariationSelectorMode value);
private:
void PrepareHarfBuzzFontData();
Member<const FontPlatformData> platform_data_;
Member<HarfBuzzFontData> harfbuzz_font_data_;
};
inline constexpr hb_codepoint_t kUnmatchedVSGlyphId =
static_cast<hb_codepoint_t>(-1);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARFBUZZ_FACE_H_
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