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// Copyright 2014 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 UI_GFX_RENDER_TEXT_HARFBUZZ_H_
#define UI_GFX_RENDER_TEXT_HARFBUZZ_H_
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "third_party/harfbuzz-ng/src/hb.h"
#include "third_party/icu/source/common/unicode/ubidi.h"
#include "third_party/icu/source/common/unicode/uscript.h"
#include "ui/gfx/render_text.h"
namespace gfx {
namespace internal {
struct GFX_EXPORT TextRunHarfBuzz {
TextRunHarfBuzz();
~TextRunHarfBuzz();
// Returns the index of the first glyph that corresponds to the character at
// |pos|.
size_t CharToGlyph(size_t pos) const;
// Returns the corresponding glyph range of the given character range.
// |range| is in text-space (0 corresponds to |GetLayoutText()[0]|). Returned
// value is in run-space (0 corresponds to the first glyph in the run).
Range CharRangeToGlyphRange(const Range& range) const;
// Returns whether the given shaped run contains any missing glyphs.
bool HasMissingGlyphs() const;
// Returns the X coordinate of the leading or |trailing| edge of the glyph
// starting at |text_index|, relative to the left of the text (not the view).
int GetGlyphXBoundary(size_t text_index, bool trailing) const;
int width;
int preceding_run_widths;
Range range;
bool is_rtl;
UBiDiLevel level;
UScriptCode script;
scoped_ptr<uint16[]> glyphs;
scoped_ptr<SkPoint[]> positions;
scoped_ptr<uint32[]> glyph_to_char;
size_t glyph_count;
skia::RefPtr<SkTypeface> skia_face;
int font_size;
int font_style;
bool strike;
bool diagonal_strike;
bool underline;
private:
DISALLOW_COPY_AND_ASSIGN(TextRunHarfBuzz);
};
} // namespace internal
class RenderTextHarfBuzz : public RenderText {
public:
RenderTextHarfBuzz();
virtual ~RenderTextHarfBuzz();
// Overridden from RenderText.
virtual Size GetStringSize() OVERRIDE;
virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
virtual std::vector<FontSpan> GetFontSpansForTesting() OVERRIDE;
protected:
// Overridden from RenderText.
virtual int GetLayoutTextBaseline() OVERRIDE;
virtual SelectionModel AdjacentCharSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) OVERRIDE;
virtual SelectionModel AdjacentWordSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) OVERRIDE;
virtual Range GetGlyphBounds(size_t index) OVERRIDE;
virtual std::vector<Rect> GetSubstringBounds(const Range& range) OVERRIDE;
virtual size_t TextIndexToLayoutIndex(size_t index) const OVERRIDE;
virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE;
virtual bool IsValidCursorIndex(size_t index) OVERRIDE;
virtual void ResetLayout() OVERRIDE;
virtual void EnsureLayout() OVERRIDE;
virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
private:
// Return the run index that contains the argument; or the length of the
// |runs_| vector if argument exceeds the text length or width.
size_t GetRunContainingCaret(const SelectionModel& caret) const;
size_t GetRunContainingXCoord(int x, int* offset) const;
// Given a |run|, returns the SelectionModel that contains the logical first
// or last caret position inside (not at a boundary of) the run.
// The returned value represents a cursor/caret position without a selection.
SelectionModel FirstSelectionModelInsideRun(
const internal::TextRunHarfBuzz* run);
SelectionModel LastSelectionModelInsideRun(
const internal::TextRunHarfBuzz* run);
// Break the text into logical runs and populate the visual <-> logical maps.
void ItemizeText();
// Shape the glyphs needed for the text |run|.
void ShapeRun(internal::TextRunHarfBuzz* run);
// Text runs in logical order.
ScopedVector<internal::TextRunHarfBuzz> runs_;
// Maps visual run indices to logical run indices and vice versa.
std::vector<int32_t> visual_to_logical_;
std::vector<int32_t> logical_to_visual_;
bool needs_layout_;
DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz);
};
} // namespace gfx
#endif // UI_GFX_RENDER_TEXT_HARFBUZZ_H_
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