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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_HARF_BUZZ_SHAPER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARF_BUZZ_SHAPER_H_
#include "third_party/blink/renderer/platform/fonts/shaping/run_segmenter.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class Font;
class SimpleFontData;
class HarfBuzzShaper;
struct ReshapeQueueItem;
struct RangeData;
struct BufferSlice;
class PLATFORM_EXPORT HarfBuzzShaper final {
public:
HarfBuzzShaper(const UChar*, unsigned length);
// Shape a range, defined by the start and end parameters, of the string
// supplied to the constructor.
// The start and end positions should represent boundaries where a break may
// occur, such as at the beginning or end of lines or at element boundaries.
// If given arbitrary positions the results are not guaranteed to be correct.
// May be called multiple times; font and direction may vary between calls.
scoped_refptr<ShapeResult> Shape(const Font*,
TextDirection,
unsigned start,
unsigned end) const;
// Shape the entire string with a single font and direction.
// Equivalent to calling the range version with a start offset of zero and an
// end offset equal to the length.
scoped_refptr<ShapeResult> Shape(const Font*, TextDirection) const;
const UChar* GetText() const { return text_; }
unsigned TextLength() const { return text_length_; }
~HarfBuzzShaper() = default;
private:
// Shapes a single seqment, as identified by the RunSegmenterRange parameter,
// one or more times taking font fallback into account. The start and end
// parameters are for the entire text run, not the segment, and are used to
// determine pre- and post-context for shaping.
void ShapeSegment(RangeData*,
RunSegmenter::RunSegmenterRange,
ShapeResult*) const;
void ExtractShapeResults(RangeData*,
bool& font_cycle_queued,
const ReshapeQueueItem&,
const SimpleFontData*,
UScriptCode,
CanvasRotationInVertical,
bool is_last_resort,
ShapeResult*) const;
bool CollectFallbackHintChars(const Deque<ReshapeQueueItem>&,
Vector<UChar32>& hint) const;
void CommitGlyphs(RangeData*,
const SimpleFontData* current_font,
UScriptCode current_run_script,
CanvasRotationInVertical,
bool is_last_resort,
const BufferSlice&,
ShapeResult*) const;
const UChar* text_;
unsigned text_length_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_HARF_BUZZ_SHAPER_H_
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