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Side by Side Diff: ui/gfx/render_text.h

Issue 1819753003: Allow various font weights in gfx. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Address Alexei's issues Created 4 years, 8 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 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_H_ 5 #ifndef UI_GFX_RENDER_TEXT_H_
6 #define UI_GFX_RENDER_TEXT_H_ 6 #define UI_GFX_RENDER_TEXT_H_
7 7
8 #include <stddef.h> 8 #include <stddef.h>
9 #include <stdint.h> 9 #include <stdint.h>
10 10
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55 class GFX_EXPORT SkiaTextRenderer { 55 class GFX_EXPORT SkiaTextRenderer {
56 public: 56 public:
57 explicit SkiaTextRenderer(Canvas* canvas); 57 explicit SkiaTextRenderer(Canvas* canvas);
58 virtual ~SkiaTextRenderer(); 58 virtual ~SkiaTextRenderer();
59 59
60 void SetDrawLooper(sk_sp<SkDrawLooper> draw_looper); 60 void SetDrawLooper(sk_sp<SkDrawLooper> draw_looper);
61 void SetFontRenderParams(const FontRenderParams& params, 61 void SetFontRenderParams(const FontRenderParams& params,
62 bool subpixel_rendering_suppressed); 62 bool subpixel_rendering_suppressed);
63 void SetTypeface(SkTypeface* typeface); 63 void SetTypeface(SkTypeface* typeface);
64 void SetTextSize(SkScalar size); 64 void SetTextSize(SkScalar size);
65 void SetFontWithStyle(const Font& font, int font_style); 65 void SetFont(const Font& font, bool italic, gfx::Font::Weight weight);
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66 void SetForegroundColor(SkColor foreground); 66 void SetForegroundColor(SkColor foreground);
67 void SetShader(sk_sp<SkShader> shader); 67 void SetShader(sk_sp<SkShader> shader);
68 // Sets underline metrics to use if the text will be drawn with an underline. 68 // Sets underline metrics to use if the text will be drawn with an underline.
69 // If not set, default values based on the size of the text will be used. The 69 // If not set, default values based on the size of the text will be used. The
70 // two metrics must be set together. 70 // two metrics must be set together.
71 void SetUnderlineMetrics(SkScalar thickness, SkScalar position); 71 void SetUnderlineMetrics(SkScalar thickness, SkScalar position);
72 void DrawSelection(const std::vector<Rect>& selection, SkColor color); 72 void DrawSelection(const std::vector<Rect>& selection, SkColor color);
73 virtual void DrawPosText(const SkPoint* pos, 73 virtual void DrawPosText(const SkPoint* pos,
74 const uint16_t* glyphs, 74 const uint16_t* glyphs,
75 size_t glyph_count); 75 size_t glyph_count);
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116 scoped_ptr<DiagonalStrike> diagonal_; 116 scoped_ptr<DiagonalStrike> diagonal_;
117 117
118 DISALLOW_COPY_AND_ASSIGN(SkiaTextRenderer); 118 DISALLOW_COPY_AND_ASSIGN(SkiaTextRenderer);
119 }; 119 };
120 120
121 // Internal helper class used to iterate colors, baselines, and styles. 121 // Internal helper class used to iterate colors, baselines, and styles.
122 class StyleIterator { 122 class StyleIterator {
123 public: 123 public:
124 StyleIterator(const BreakList<SkColor>& colors, 124 StyleIterator(const BreakList<SkColor>& colors,
125 const BreakList<BaselineStyle>& baselines, 125 const BreakList<BaselineStyle>& baselines,
126 const BreakList<gfx::Font::Weight>& weights,
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126 const std::vector<BreakList<bool>>& styles); 127 const std::vector<BreakList<bool>>& styles);
127 ~StyleIterator(); 128 ~StyleIterator();
128 129
129 // Get the colors and styles at the current iterator position. 130 // Get the colors and styles at the current iterator position.
130 SkColor color() const { return color_->second; } 131 SkColor color() const { return color_->second; }
131 BaselineStyle baseline() const { return baseline_->second; } 132 BaselineStyle baseline() const { return baseline_->second; }
132 bool style(TextStyle s) const { return style_[s]->second; } 133 bool style(TextStyle s) const { return style_[s]->second; }
134 gfx::Font::Weight weight() const { return weight_->second; }
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133 135
134 // Get the intersecting range of the current iterator set. 136 // Get the intersecting range of the current iterator set.
135 Range GetRange() const; 137 Range GetRange() const;
136 138
137 // Update the iterator to point to colors and styles applicable at |position|. 139 // Update the iterator to point to colors and styles applicable at |position|.
138 void UpdatePosition(size_t position); 140 void UpdatePosition(size_t position);
139 141
140 private: 142 private:
141 BreakList<SkColor> colors_; 143 BreakList<SkColor> colors_;
142 BreakList<BaselineStyle> baselines_; 144 BreakList<BaselineStyle> baselines_;
145 BreakList<gfx::Font::Weight> weights_;
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143 std::vector<BreakList<bool> > styles_; 146 std::vector<BreakList<bool> > styles_;
144 147
145 BreakList<SkColor>::const_iterator color_; 148 BreakList<SkColor>::const_iterator color_;
146 BreakList<BaselineStyle>::const_iterator baseline_; 149 BreakList<BaselineStyle>::const_iterator baseline_;
150 BreakList<gfx::Font::Weight>::const_iterator weight_;
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147 std::vector<BreakList<bool>::const_iterator> style_; 151 std::vector<BreakList<bool>::const_iterator> style_;
148 152
149 DISALLOW_COPY_AND_ASSIGN(StyleIterator); 153 DISALLOW_COPY_AND_ASSIGN(StyleIterator);
150 }; 154 };
151 155
152 // Line segments are slices of the display text to be rendered on a single line. 156 // Line segments are slices of the display text to be rendered on a single line.
153 struct LineSegment { 157 struct LineSegment {
154 LineSegment(); 158 LineSegment();
155 ~LineSegment(); 159 ~LineSegment();
156 160
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179 // The sum of segment widths and the maximum of segment heights. 183 // The sum of segment widths and the maximum of segment heights.
180 SizeF size; 184 SizeF size;
181 185
182 // Sum of preceding lines' heights. 186 // Sum of preceding lines' heights.
183 int preceding_heights; 187 int preceding_heights;
184 188
185 // Maximum baseline of all segments on this line. 189 // Maximum baseline of all segments on this line.
186 int baseline; 190 int baseline;
187 }; 191 };
188 192
189 // Creates an SkTypeface from a font and a |gfx::Font::FontStyle|. 193 // Creates an SkTypeface from a font, italic flag and weight. May return NULL.
190 // May return NULL. 194 skia::RefPtr<SkTypeface> CreateSkiaTypeface(const gfx::Font& font,
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191 skia::RefPtr<SkTypeface> CreateSkiaTypeface(const gfx::Font& font, int style); 195 bool italic,
196 gfx::Font::Weight weight);
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192 197
193 // Applies the given FontRenderParams to a Skia |paint|. 198 // Applies the given FontRenderParams to a Skia |paint|.
194 void ApplyRenderParams(const FontRenderParams& params, 199 void ApplyRenderParams(const FontRenderParams& params,
195 bool subpixel_rendering_suppressed, 200 bool subpixel_rendering_suppressed,
196 SkPaint* paint); 201 SkPaint* paint);
197 202
198 } // namespace internal 203 } // namespace internal
199 204
200 // RenderText represents an abstract model of styled text and its corresponding 205 // RenderText represents an abstract model of styled text and its corresponding
201 // visual layout. Support is built in for a cursor, a selection, simple styling, 206 // visual layout. Support is built in for a cursor, a selection, simple styling,
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356 // The |range| should be valid, non-reversed, and within [0, text().length()]. 361 // The |range| should be valid, non-reversed, and within [0, text().length()].
357 void SetBaselineStyle(BaselineStyle value); 362 void SetBaselineStyle(BaselineStyle value);
358 void ApplyBaselineStyle(BaselineStyle value, const Range& range); 363 void ApplyBaselineStyle(BaselineStyle value, const Range& range);
359 364
360 // Set various text styles over the entire text or a logical character range. 365 // Set various text styles over the entire text or a logical character range.
361 // The respective |style| is applied if |value| is true, or removed if false. 366 // The respective |style| is applied if |value| is true, or removed if false.
362 // The |range| should be valid, non-reversed, and within [0, text().length()]. 367 // The |range| should be valid, non-reversed, and within [0, text().length()].
363 void SetStyle(TextStyle style, bool value); 368 void SetStyle(TextStyle style, bool value);
364 void ApplyStyle(TextStyle style, bool value, const Range& range); 369 void ApplyStyle(TextStyle style, bool value, const Range& range);
365 370
371 void SetWeight(gfx::Font::Weight weight);
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372 void ApplyWeight(gfx::Font::Weight weight, const Range& range);
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373
366 // Returns whether this style is enabled consistently across the entire 374 // Returns whether this style is enabled consistently across the entire
367 // RenderText. 375 // RenderText.
368 bool GetStyle(TextStyle style) const; 376 bool GetStyle(TextStyle style) const;
369 377
370 // Set or get the text directionality mode and get the text direction yielded. 378 // Set or get the text directionality mode and get the text direction yielded.
371 void SetDirectionalityMode(DirectionalityMode mode); 379 void SetDirectionalityMode(DirectionalityMode mode);
372 DirectionalityMode directionality_mode() const { 380 DirectionalityMode directionality_mode() const {
373 return directionality_mode_; 381 return directionality_mode_;
374 } 382 }
375 base::i18n::TextDirection GetDisplayTextDirection(); 383 base::i18n::TextDirection GetDisplayTextDirection();
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479 RenderText(); 487 RenderText();
480 488
481 // NOTE: The value of these accessors may be stale. Please make sure 489 // NOTE: The value of these accessors may be stale. Please make sure
482 // that these fields are up-to-date before accessing them. 490 // that these fields are up-to-date before accessing them.
483 const base::string16& layout_text() const { return layout_text_; } 491 const base::string16& layout_text() const { return layout_text_; }
484 const base::string16& display_text() const { return display_text_; } 492 const base::string16& display_text() const { return display_text_; }
485 bool text_elided() const { return text_elided_; } 493 bool text_elided() const { return text_elided_; }
486 494
487 const BreakList<SkColor>& colors() const { return colors_; } 495 const BreakList<SkColor>& colors() const { return colors_; }
488 const BreakList<BaselineStyle>& baselines() const { return baselines_; } 496 const BreakList<BaselineStyle>& baselines() const { return baselines_; }
497 const BreakList<gfx::Font::Weight>& weights() const { return weights_; }
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489 const std::vector<BreakList<bool> >& styles() const { return styles_; } 498 const std::vector<BreakList<bool> >& styles() const { return styles_; }
490 499
491 const std::vector<internal::Line>& lines() const { return lines_; } 500 const std::vector<internal::Line>& lines() const { return lines_; }
492 void set_lines(std::vector<internal::Line>* lines) { lines_.swap(*lines); } 501 void set_lines(std::vector<internal::Line>* lines) { lines_.swap(*lines); }
493 502
494 // Returns the baseline of the current text. The return value depends on 503 // Returns the baseline of the current text. The return value depends on
495 // the text and its layout while the return value of GetBaseline() doesn't. 504 // the text and its layout while the return value of GetBaseline() doesn't.
496 // GetAlignmentOffset() takes into account the difference between them. 505 // GetAlignmentOffset() takes into account the difference between them.
497 // 506 //
498 // We'd like a RenderText to show the text always on the same baseline 507 // We'd like a RenderText to show the text always on the same baseline
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734 bool focused_; 743 bool focused_;
735 744
736 // Composition text range. 745 // Composition text range.
737 Range composition_range_; 746 Range composition_range_;
738 747
739 // Color, baseline, and style breaks, used to modify ranges of text. 748 // Color, baseline, and style breaks, used to modify ranges of text.
740 // BreakList positions are stored with text indices, not display indices. 749 // BreakList positions are stored with text indices, not display indices.
741 // TODO(msw): Expand to support cursor, selection, background, etc. colors. 750 // TODO(msw): Expand to support cursor, selection, background, etc. colors.
742 BreakList<SkColor> colors_; 751 BreakList<SkColor> colors_;
743 BreakList<BaselineStyle> baselines_; 752 BreakList<BaselineStyle> baselines_;
753 BreakList<gfx::Font::Weight> weights_;
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744 std::vector<BreakList<bool> > styles_; 754 std::vector<BreakList<bool> > styles_;
745 755
746 // Breaks saved without temporary composition and selection styling. 756 // Breaks saved without temporary composition and selection styling.
747 BreakList<SkColor> saved_colors_; 757 BreakList<SkColor> saved_colors_;
748 BreakList<bool> saved_underlines_; 758 BreakList<bool> saved_underlines_;
749 bool composition_and_selection_styles_applied_; 759 bool composition_and_selection_styles_applied_;
750 760
751 // A flag to obscure actual text with asterisks for password fields. 761 // A flag to obscure actual text with asterisks for password fields.
752 bool obscured_; 762 bool obscured_;
753 // The index at which the char should be revealed in the obscured text. 763 // The index at which the char should be revealed in the obscured text.
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821 // Lines computed by EnsureLayout. These should be invalidated upon 831 // Lines computed by EnsureLayout. These should be invalidated upon
822 // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls. 832 // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls.
823 std::vector<internal::Line> lines_; 833 std::vector<internal::Line> lines_;
824 834
825 DISALLOW_COPY_AND_ASSIGN(RenderText); 835 DISALLOW_COPY_AND_ASSIGN(RenderText);
826 }; 836 };
827 837
828 } // namespace gfx 838 } // namespace gfx
829 839
830 #endif // UI_GFX_RENDER_TEXT_H_ 840 #endif // UI_GFX_RENDER_TEXT_H_
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