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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 #include "ui/gfx/pango_util.h" | 5 #include "ui/gfx/pango_util.h" |
6 | 6 |
7 #include <cairo/cairo.h> | 7 #include <cairo/cairo.h> |
8 #include <fontconfig/fontconfig.h> | 8 #include <fontconfig/fontconfig.h> |
9 #include <pango/pango.h> | 9 #include <pango/pango.h> |
10 #include <pango/pangocairo.h> | 10 #include <pango/pangocairo.h> |
11 #include <string> | 11 #include <string> |
12 | 12 |
13 #include <algorithm> | 13 #include <algorithm> |
14 #include <map> | 14 #include <map> |
15 #include <vector> | 15 #include <vector> |
16 | 16 |
17 #include "base/logging.h" | 17 #include "base/logging.h" |
18 #include "base/utf_string_conversions.h" | 18 #include "base/utf_string_conversions.h" |
19 #include "ui/gfx/canvas.h" | 19 #include "ui/gfx/canvas.h" |
20 #include "ui/gfx/font.h" | 20 #include "ui/gfx/font.h" |
21 #include "ui/gfx/font_render_params_linux.h" | 21 #include "ui/gfx/font_render_params_linux.h" |
22 #include "ui/gfx/platform_font_pango.h" | 22 #include "ui/gfx/platform_font_pango.h" |
23 #include "ui/gfx/rect.h" | 23 #include "ui/gfx/rect.h" |
24 #include "ui/gfx/skia_util.h" | 24 #include "ui/gfx/skia_util.h" |
25 | 25 |
26 #if defined(TOOLKIT_GTK) | 26 #if defined(TOOLKIT_GTK) |
27 #include <gdk/gdk.h> | 27 #include <gdk/gdk.h> |
28 #endif | 28 #endif |
29 | 29 |
| 30 namespace gfx { |
| 31 |
30 namespace { | 32 namespace { |
31 | 33 |
32 // Marker for accelerators in the text. | 34 // Marker for accelerators in the text. |
33 const gunichar kAcceleratorChar = '&'; | 35 const gunichar kAcceleratorChar = '&'; |
34 | 36 |
35 // Multiply by the text height to determine how much text should be faded | 37 // Multiply by the text height to determine how much text should be faded |
36 // when elliding. | 38 // when elliding. |
37 const double kFadeWidthFactor = 1.5; | 39 const double kFadeWidthFactor = 1.5; |
38 | 40 |
39 // End state of the elliding fade. | 41 // End state of the elliding fade. |
40 const double kFadeFinalAlpha = 0.15; | 42 const double kFadeFinalAlpha = 0.15; |
41 | 43 |
42 // Return |cairo_font_options|. If needed, allocate and update it. | 44 // Return |cairo_font_options|. If needed, allocate and update it. |
43 // TODO(derat): Return font-specific options: http://crbug.com/125235 | 45 // TODO(derat): Return font-specific options: http://crbug.com/125235 |
44 cairo_font_options_t* GetCairoFontOptions() { | 46 cairo_font_options_t* GetCairoFontOptions() { |
45 // Font settings that we initialize once and then use when drawing text. | 47 // Font settings that we initialize once and then use when drawing text. |
46 static cairo_font_options_t* cairo_font_options = NULL; | 48 static cairo_font_options_t* cairo_font_options = NULL; |
47 if (cairo_font_options) | 49 if (cairo_font_options) |
48 return cairo_font_options; | 50 return cairo_font_options; |
49 | 51 |
50 cairo_font_options = cairo_font_options_create(); | 52 cairo_font_options = cairo_font_options_create(); |
51 | 53 |
52 const gfx::FontRenderParams& params = gfx::GetDefaultFontRenderParams(); | 54 const FontRenderParams& params = GetDefaultFontRenderParams(); |
53 gfx::FontRenderParams::SubpixelRendering subpixel = params.subpixel_rendering; | 55 FontRenderParams::SubpixelRendering subpixel = params.subpixel_rendering; |
54 if (!params.antialiasing) { | 56 if (!params.antialiasing) { |
55 cairo_font_options_set_antialias(cairo_font_options, CAIRO_ANTIALIAS_NONE); | 57 cairo_font_options_set_antialias(cairo_font_options, CAIRO_ANTIALIAS_NONE); |
56 } else if (subpixel == gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE) { | 58 } else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_NONE) { |
57 cairo_font_options_set_antialias(cairo_font_options, CAIRO_ANTIALIAS_GRAY); | 59 cairo_font_options_set_antialias(cairo_font_options, CAIRO_ANTIALIAS_GRAY); |
58 } else { | 60 } else { |
59 cairo_font_options_set_antialias(cairo_font_options, | 61 cairo_font_options_set_antialias(cairo_font_options, |
60 CAIRO_ANTIALIAS_SUBPIXEL); | 62 CAIRO_ANTIALIAS_SUBPIXEL); |
61 cairo_subpixel_order_t cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT; | 63 cairo_subpixel_order_t cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT; |
62 if (subpixel == gfx::FontRenderParams::SUBPIXEL_RENDERING_RGB) | 64 if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_RGB) |
63 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB; | 65 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB; |
64 else if (subpixel == gfx::FontRenderParams::SUBPIXEL_RENDERING_BGR) | 66 else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_BGR) |
65 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR; | 67 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR; |
66 else if (subpixel == gfx::FontRenderParams::SUBPIXEL_RENDERING_VRGB) | 68 else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_VRGB) |
67 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB; | 69 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB; |
68 else if (subpixel == gfx::FontRenderParams::SUBPIXEL_RENDERING_VBGR) | 70 else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_VBGR) |
69 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR; | 71 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR; |
70 else | 72 else |
71 NOTREACHED() << "Unhandled subpixel rendering type " << subpixel; | 73 NOTREACHED() << "Unhandled subpixel rendering type " << subpixel; |
72 cairo_font_options_set_subpixel_order(cairo_font_options, | 74 cairo_font_options_set_subpixel_order(cairo_font_options, |
73 cairo_subpixel_order); | 75 cairo_subpixel_order); |
74 } | 76 } |
75 | 77 |
76 if (params.hinting == gfx::FontRenderParams::HINTING_NONE || | 78 if (params.hinting == FontRenderParams::HINTING_NONE || |
77 params.subpixel_positioning) { | 79 params.subpixel_positioning) { |
78 cairo_font_options_set_hint_style(cairo_font_options, | 80 cairo_font_options_set_hint_style(cairo_font_options, |
79 CAIRO_HINT_STYLE_NONE); | 81 CAIRO_HINT_STYLE_NONE); |
80 cairo_font_options_set_hint_metrics(cairo_font_options, | 82 cairo_font_options_set_hint_metrics(cairo_font_options, |
81 CAIRO_HINT_METRICS_OFF); | 83 CAIRO_HINT_METRICS_OFF); |
82 } else { | 84 } else { |
83 cairo_hint_style_t cairo_hint_style = CAIRO_HINT_STYLE_DEFAULT; | 85 cairo_hint_style_t cairo_hint_style = CAIRO_HINT_STYLE_DEFAULT; |
84 if (params.hinting == gfx::FontRenderParams::HINTING_SLIGHT) | 86 if (params.hinting == FontRenderParams::HINTING_SLIGHT) |
85 cairo_hint_style = CAIRO_HINT_STYLE_SLIGHT; | 87 cairo_hint_style = CAIRO_HINT_STYLE_SLIGHT; |
86 else if (params.hinting == gfx::FontRenderParams::HINTING_MEDIUM) | 88 else if (params.hinting == FontRenderParams::HINTING_MEDIUM) |
87 cairo_hint_style = CAIRO_HINT_STYLE_MEDIUM; | 89 cairo_hint_style = CAIRO_HINT_STYLE_MEDIUM; |
88 else if (params.hinting == gfx::FontRenderParams::HINTING_FULL) | 90 else if (params.hinting == FontRenderParams::HINTING_FULL) |
89 cairo_hint_style = CAIRO_HINT_STYLE_FULL; | 91 cairo_hint_style = CAIRO_HINT_STYLE_FULL; |
90 else | 92 else |
91 NOTREACHED() << "Unhandled hinting style " << params.hinting; | 93 NOTREACHED() << "Unhandled hinting style " << params.hinting; |
92 cairo_font_options_set_hint_style(cairo_font_options, cairo_hint_style); | 94 cairo_font_options_set_hint_style(cairo_font_options, cairo_hint_style); |
93 cairo_font_options_set_hint_metrics(cairo_font_options, | 95 cairo_font_options_set_hint_metrics(cairo_font_options, |
94 CAIRO_HINT_METRICS_ON); | 96 CAIRO_HINT_METRICS_ON); |
95 } | 97 } |
96 | 98 |
97 return cairo_font_options; | 99 return cairo_font_options; |
98 } | 100 } |
99 | 101 |
100 // Returns the number of pixels in a point. | 102 // Returns the number of pixels in a point. |
101 // - multiply a point size by this to get pixels ("device units") | 103 // - multiply a point size by this to get pixels ("device units") |
102 // - divide a pixel size by this to get points | 104 // - divide a pixel size by this to get points |
103 float GetPixelsInPoint() { | 105 float GetPixelsInPoint() { |
104 static float pixels_in_point = 1.0; | 106 static float pixels_in_point = 1.0; |
105 static bool determined_value = false; | 107 static bool determined_value = false; |
106 | 108 |
107 if (!determined_value) { | 109 if (!determined_value) { |
108 // http://goo.gl/UIh5m: "This is a scale factor between points specified in | 110 // http://goo.gl/UIh5m: "This is a scale factor between points specified in |
109 // a PangoFontDescription and Cairo units. The default value is 96, meaning | 111 // a PangoFontDescription and Cairo units. The default value is 96, meaning |
110 // that a 10 point font will be 13 units high. (10 * 96. / 72. = 13.3)." | 112 // that a 10 point font will be 13 units high. (10 * 96. / 72. = 13.3)." |
111 double pango_dpi = gfx::GetPangoResolution(); | 113 double pango_dpi = GetPangoResolution(); |
112 if (pango_dpi <= 0) | 114 if (pango_dpi <= 0) |
113 pango_dpi = 96.0; | 115 pango_dpi = 96.0; |
114 pixels_in_point = pango_dpi / 72.0; // 72 points in an inch | 116 pixels_in_point = pango_dpi / 72.0; // 72 points in an inch |
115 determined_value = true; | 117 determined_value = true; |
116 } | 118 } |
117 | 119 |
118 return pixels_in_point; | 120 return pixels_in_point; |
119 } | 121 } |
120 | 122 |
121 } // namespace | 123 } // namespace |
122 | 124 |
123 namespace gfx { | |
124 | |
125 PangoContext* GetPangoContext() { | 125 PangoContext* GetPangoContext() { |
126 #if defined(USE_AURA) | 126 #if defined(USE_AURA) |
127 PangoFontMap* font_map = pango_cairo_font_map_get_default(); | 127 PangoFontMap* font_map = pango_cairo_font_map_get_default(); |
128 return pango_font_map_create_context(font_map); | 128 return pango_font_map_create_context(font_map); |
129 #else | 129 #else |
130 return gdk_pango_context_get(); | 130 return gdk_pango_context_get(); |
131 #endif | 131 #endif |
132 } | 132 } |
133 | 133 |
134 double GetPangoResolution() { | 134 double GetPangoResolution() { |
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146 void DrawTextOntoCairoSurface(cairo_t* cr, | 146 void DrawTextOntoCairoSurface(cairo_t* cr, |
147 const string16& text, | 147 const string16& text, |
148 const gfx::Font& font, | 148 const gfx::Font& font, |
149 const gfx::Rect& bounds, | 149 const gfx::Rect& bounds, |
150 const gfx::Rect& clip, | 150 const gfx::Rect& clip, |
151 SkColor text_color, | 151 SkColor text_color, |
152 int flags) { | 152 int flags) { |
153 PangoLayout* layout = pango_cairo_create_layout(cr); | 153 PangoLayout* layout = pango_cairo_create_layout(cr); |
154 base::i18n::TextDirection text_direction = | 154 base::i18n::TextDirection text_direction = |
155 base::i18n::GetFirstStrongCharacterDirection(text); | 155 base::i18n::GetFirstStrongCharacterDirection(text); |
156 Rect text_rect(bounds.x(), bounds.y(), 0, 0); | |
157 DCHECK(!bounds.IsEmpty()); | 156 DCHECK(!bounds.IsEmpty()); |
158 | 157 |
159 gfx::SetupPangoLayout( | 158 gfx::SetupPangoLayout( |
160 layout, text, font, bounds.width(), text_direction, flags); | 159 layout, text, font, bounds.width(), text_direction, flags); |
161 | 160 |
162 pango_layout_set_height(layout, bounds.height() * PANGO_SCALE); | 161 pango_layout_set_height(layout, bounds.height() * PANGO_SCALE); |
163 | 162 |
164 cairo_save(cr); | 163 cairo_save(cr); |
165 cairo_rectangle(cr, clip.x(), clip.y(), clip.width(), clip.height()); | 164 cairo_rectangle(cr, clip.x(), clip.y(), clip.width(), clip.height()); |
166 cairo_clip(cr); | 165 cairo_clip(cr); |
167 | 166 |
168 AdjustTextRectBasedOnLayout(layout, bounds, flags, &text_rect); | 167 int width = 0, height = 0; |
| 168 pango_layout_get_pixel_size(layout, &width, &height); |
| 169 Rect text_rect(bounds.x(), bounds.y(), width, height); |
| 170 // Vertically center |text_rect| in |bounds|. |
| 171 text_rect.Offset(0, (bounds.height() - text_rect.height()) / 2); |
169 | 172 |
170 DrawPangoLayout(cr, layout, font, bounds, text_rect, | 173 DrawPangoLayout(cr, layout, font, bounds, text_rect, |
171 text_color, text_direction, flags); | 174 text_color, text_direction, flags); |
172 | 175 |
173 cairo_restore(cr); | 176 cairo_restore(cr); |
174 g_object_unref(layout); | 177 g_object_unref(layout); |
175 } | 178 } |
176 | 179 |
177 // Pass a width greater than 0 to force wrapping and eliding. | 180 // Pass a width greater than 0 to force wrapping and eliding. |
178 static void SetupPangoLayoutWithoutFont( | 181 static void SetupPangoLayoutWithoutFont( |
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294 int width, | 297 int width, |
295 base::i18n::TextDirection text_direction, | 298 base::i18n::TextDirection text_direction, |
296 int flags) { | 299 int flags) { |
297 SetupPangoLayoutWithoutFont(layout, text, width, text_direction, flags); | 300 SetupPangoLayoutWithoutFont(layout, text, width, text_direction, flags); |
298 | 301 |
299 ScopedPangoFontDescription desc( | 302 ScopedPangoFontDescription desc( |
300 pango_font_description_from_string(font_description.c_str())); | 303 pango_font_description_from_string(font_description.c_str())); |
301 pango_layout_set_font_description(layout, desc.get()); | 304 pango_layout_set_font_description(layout, desc.get()); |
302 } | 305 } |
303 | 306 |
304 void AdjustTextRectBasedOnLayout(PangoLayout* layout, | |
305 const gfx::Rect& bounds, | |
306 int flags, | |
307 gfx::Rect* text_rect) { | |
308 int text_width, text_height; | |
309 pango_layout_get_pixel_size(layout, &text_width, &text_height); | |
310 text_rect->set_width(text_width); | |
311 text_rect->set_height(text_height); | |
312 | |
313 if (flags & gfx::Canvas::TEXT_VALIGN_TOP) { | |
314 // Cairo should draw from the top left corner already. | |
315 } else if (flags & gfx::Canvas::TEXT_VALIGN_BOTTOM) { | |
316 text_rect->set_y(text_rect->y() + bounds.height() - text_rect->height()); | |
317 } else { | |
318 // Vertically centered. | |
319 text_rect->set_y(text_rect->y() + | |
320 ((bounds.height() - text_rect->height()) / 2)); | |
321 } | |
322 } | |
323 | |
324 void DrawPangoLayout(cairo_t* cr, | 307 void DrawPangoLayout(cairo_t* cr, |
325 PangoLayout* layout, | 308 PangoLayout* layout, |
326 const Font& font, | 309 const Font& font, |
327 const gfx::Rect& bounds, | 310 const gfx::Rect& bounds, |
328 const gfx::Rect& text_rect, | 311 const gfx::Rect& text_rect, |
329 SkColor text_color, | 312 SkColor text_color, |
330 base::i18n::TextDirection text_direction, | 313 base::i18n::TextDirection text_direction, |
331 int flags) { | 314 int flags) { |
332 double r = SkColorGetR(text_color) / 255.0, | 315 double r = SkColorGetR(text_color) / 255.0, |
333 g = SkColorGetG(text_color) / 255.0, | 316 g = SkColorGetG(text_color) / 255.0, |
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424 | 407 |
425 if (i == desc_to_metrics->end()) { | 408 if (i == desc_to_metrics->end()) { |
426 PangoFontMetrics* metrics = pango_context_get_metrics(context, desc, NULL); | 409 PangoFontMetrics* metrics = pango_context_get_metrics(context, desc, NULL); |
427 desc_to_metrics->insert(std::make_pair(desc_hash, metrics)); | 410 desc_to_metrics->insert(std::make_pair(desc_hash, metrics)); |
428 return metrics; | 411 return metrics; |
429 } | 412 } |
430 return i->second; | 413 return i->second; |
431 } | 414 } |
432 | 415 |
433 } // namespace gfx | 416 } // namespace gfx |
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