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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_RENDER_TEXT_HARFBUZZ_H_ | 5 #ifndef UI_GFX_RENDER_TEXT_HARFBUZZ_H_ |
6 #define UI_GFX_RENDER_TEXT_HARFBUZZ_H_ | 6 #define UI_GFX_RENDER_TEXT_HARFBUZZ_H_ |
7 | 7 |
| 8 #include "base/i18n/break_iterator.h" |
8 #include "base/memory/scoped_ptr.h" | 9 #include "base/memory/scoped_ptr.h" |
9 #include "base/memory/scoped_vector.h" | 10 #include "base/memory/scoped_vector.h" |
10 #include "third_party/harfbuzz-ng/src/hb.h" | 11 #include "third_party/harfbuzz-ng/src/hb.h" |
11 #include "third_party/icu/source/common/unicode/ubidi.h" | 12 #include "third_party/icu/source/common/unicode/ubidi.h" |
12 #include "third_party/icu/source/common/unicode/uscript.h" | 13 #include "third_party/icu/source/common/unicode/uscript.h" |
13 #include "ui/gfx/render_text.h" | 14 #include "ui/gfx/render_text.h" |
14 | 15 |
15 namespace gfx { | 16 namespace gfx { |
16 | 17 |
17 namespace internal { | 18 namespace internal { |
18 | 19 |
19 struct GFX_EXPORT TextRunHarfBuzz { | 20 struct GFX_EXPORT TextRunHarfBuzz { |
20 TextRunHarfBuzz(); | 21 TextRunHarfBuzz(); |
21 ~TextRunHarfBuzz(); | 22 ~TextRunHarfBuzz(); |
22 | 23 |
23 // Returns the index of the first glyph that corresponds to the character at | 24 // Returns the index of the first glyph that corresponds to the character at |
24 // |pos|. | 25 // |pos|. |
25 size_t CharToGlyph(size_t pos) const; | 26 size_t CharToGlyph(size_t pos) const; |
26 | 27 |
27 // Returns the corresponding glyph range of the given character range. | 28 // Returns the corresponding glyph range of the given character range. |
28 // |range| is in text-space (0 corresponds to |GetLayoutText()[0]|). Returned | 29 // |range| is in text-space (0 corresponds to |GetLayoutText()[0]|). Returned |
29 // value is in run-space (0 corresponds to the first glyph in the run). | 30 // value is in run-space (0 corresponds to the first glyph in the run). |
30 Range CharRangeToGlyphRange(const Range& range) const; | 31 Range CharRangeToGlyphRange(const Range& range) const; |
31 | 32 |
32 // Returns the number of missing glyphs in the shaped text run. | 33 // Returns the number of missing glyphs in the shaped text run. |
33 size_t CountMissingGlyphs() const; | 34 size_t CountMissingGlyphs() const; |
34 | 35 |
35 // Returns the X coordinate of the leading or |trailing| edge of the glyph | 36 // Writes the character and glyph ranges of the cluster containing |pos|. |
36 // starting at |text_index|, relative to the left of the text (not the view). | 37 void GetClusterAt(size_t pos, Range* chars, Range* glyphs) const; |
37 int GetGlyphXBoundary(size_t text_index, bool trailing) const; | 38 |
| 39 // Returns the grapheme bounds at |text_index|. Handles multi-grapheme glyphs. |
| 40 Range GetGraphemeBounds(const base::string16& text, |
| 41 base::i18n::BreakIterator* grapheme_iterator, |
| 42 size_t text_index); |
| 43 |
| 44 // Returns whether the given shaped run contains any missing glyphs. |
| 45 bool HasMissingGlyphs() const; |
38 | 46 |
39 int width; | 47 int width; |
40 int preceding_run_widths; | 48 int preceding_run_widths; |
41 Range range; | 49 Range range; |
42 bool is_rtl; | 50 bool is_rtl; |
43 UBiDiLevel level; | 51 UBiDiLevel level; |
44 UScriptCode script; | 52 UScriptCode script; |
45 | 53 |
46 scoped_ptr<uint16[]> glyphs; | 54 scoped_ptr<uint16[]> glyphs; |
47 scoped_ptr<SkPoint[]> positions; | 55 scoped_ptr<SkPoint[]> positions; |
48 scoped_ptr<uint32[]> glyph_to_char; | 56 std::vector<uint32> glyph_to_char; |
49 size_t glyph_count; | 57 size_t glyph_count; |
50 | 58 |
51 skia::RefPtr<SkTypeface> skia_face; | 59 skia::RefPtr<SkTypeface> skia_face; |
52 int font_size; | 60 int font_size; |
53 int font_style; | 61 int font_style; |
54 bool strike; | 62 bool strike; |
55 bool diagonal_strike; | 63 bool diagonal_strike; |
56 bool underline; | 64 bool underline; |
57 | 65 |
58 private: | 66 private: |
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86 virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE; | 94 virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE; |
87 virtual bool IsValidCursorIndex(size_t index) OVERRIDE; | 95 virtual bool IsValidCursorIndex(size_t index) OVERRIDE; |
88 virtual void ResetLayout() OVERRIDE; | 96 virtual void ResetLayout() OVERRIDE; |
89 virtual void EnsureLayout() OVERRIDE; | 97 virtual void EnsureLayout() OVERRIDE; |
90 virtual void DrawVisualText(Canvas* canvas) OVERRIDE; | 98 virtual void DrawVisualText(Canvas* canvas) OVERRIDE; |
91 | 99 |
92 private: | 100 private: |
93 friend class RenderTextTest; | 101 friend class RenderTextTest; |
94 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_RunDirection); | 102 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_RunDirection); |
95 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_BreakRunsByUnicodeBlocks); | 103 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_BreakRunsByUnicodeBlocks); |
| 104 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_SubglyphGraphemeCases); |
| 105 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_SubglyphGraphemePartition); |
96 | 106 |
97 // Return the run index that contains the argument; or the length of the | 107 // Return the run index that contains the argument; or the length of the |
98 // |runs_| vector if argument exceeds the text length or width. | 108 // |runs_| vector if argument exceeds the text length or width. |
99 size_t GetRunContainingCaret(const SelectionModel& caret) const; | 109 size_t GetRunContainingCaret(const SelectionModel& caret) const; |
100 size_t GetRunContainingXCoord(int x, int* offset) const; | 110 size_t GetRunContainingXCoord(int x, int* offset) const; |
101 | 111 |
102 // Given a |run|, returns the SelectionModel that contains the logical first | 112 // Given a |run|, returns the SelectionModel that contains the logical first |
103 // or last caret position inside (not at a boundary of) the run. | 113 // or last caret position inside (not at a boundary of) the run. |
104 // The returned value represents a cursor/caret position without a selection. | 114 // The returned value represents a cursor/caret position without a selection. |
105 SelectionModel FirstSelectionModelInsideRun( | 115 SelectionModel FirstSelectionModelInsideRun( |
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123 std::vector<int32_t> logical_to_visual_; | 133 std::vector<int32_t> logical_to_visual_; |
124 | 134 |
125 bool needs_layout_; | 135 bool needs_layout_; |
126 | 136 |
127 DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz); | 137 DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz); |
128 }; | 138 }; |
129 | 139 |
130 } // namespace gfx | 140 } // namespace gfx |
131 | 141 |
132 #endif // UI_GFX_RENDER_TEXT_HARFBUZZ_H_ | 142 #endif // UI_GFX_RENDER_TEXT_HARFBUZZ_H_ |
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