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| 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "gfx/canvas.h" | |
| 6 | |
| 7 #include <cairo/cairo.h> | |
| 8 #include <gtk/gtk.h> | |
| 9 #include <pango/pango.h> | |
| 10 #include <pango/pangocairo.h> | |
| 11 | |
| 12 #include "base/logging.h" | |
| 13 #include "base/utf_string_conversions.h" | |
| 14 #include "gfx/font.h" | |
| 15 #include "gfx/gtk_util.h" | |
| 16 #include "gfx/rect.h" | |
| 17 | |
| 18 namespace { | |
| 19 | |
| 20 const gunichar kAcceleratorChar = '&'; | |
| 21 | |
| 22 // Font settings that we initialize once and then use when drawing text in | |
| 23 // DrawStringInt(). | |
| 24 static cairo_font_options_t* cairo_font_options = NULL; | |
| 25 | |
| 26 // Update |cairo_font_options| based on GtkSettings, allocating it if needed. | |
| 27 static void UpdateCairoFontOptions() { | |
| 28 if (!cairo_font_options) | |
| 29 cairo_font_options = cairo_font_options_create(); | |
| 30 | |
| 31 GtkSettings* gtk_settings = gtk_settings_get_default(); | |
| 32 gint antialias = 0; | |
| 33 gint hinting = 0; | |
| 34 gchar* hint_style = NULL; | |
| 35 gchar* rgba_style = NULL; | |
| 36 g_object_get(gtk_settings, | |
| 37 "gtk-xft-antialias", &antialias, | |
| 38 "gtk-xft-hinting", &hinting, | |
| 39 "gtk-xft-hintstyle", &hint_style, | |
| 40 "gtk-xft-rgba", &rgba_style, | |
| 41 NULL); | |
| 42 | |
| 43 // g_object_get() doesn't tell us whether the properties were present or not, | |
| 44 // but if they aren't (because gnome-settings-daemon isn't running), we'll get | |
| 45 // NULL values for the strings. | |
| 46 if (hint_style && rgba_style) { | |
| 47 if (!antialias) { | |
| 48 cairo_font_options_set_antialias(cairo_font_options, | |
| 49 CAIRO_ANTIALIAS_NONE); | |
| 50 } else if (strcmp(rgba_style, "none") == 0) { | |
| 51 cairo_font_options_set_antialias(cairo_font_options, | |
| 52 CAIRO_ANTIALIAS_GRAY); | |
| 53 } else { | |
| 54 cairo_font_options_set_antialias(cairo_font_options, | |
| 55 CAIRO_ANTIALIAS_SUBPIXEL); | |
| 56 cairo_subpixel_order_t cairo_subpixel_order = | |
| 57 CAIRO_SUBPIXEL_ORDER_DEFAULT; | |
| 58 if (strcmp(rgba_style, "rgb") == 0) { | |
| 59 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB; | |
| 60 } else if (strcmp(rgba_style, "bgr") == 0) { | |
| 61 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR; | |
| 62 } else if (strcmp(rgba_style, "vrgb") == 0) { | |
| 63 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB; | |
| 64 } else if (strcmp(rgba_style, "vbgr") == 0) { | |
| 65 cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR; | |
| 66 } | |
| 67 cairo_font_options_set_subpixel_order(cairo_font_options, | |
| 68 cairo_subpixel_order); | |
| 69 } | |
| 70 | |
| 71 cairo_hint_style_t cairo_hint_style = CAIRO_HINT_STYLE_DEFAULT; | |
| 72 if (hinting == 0 || strcmp(hint_style, "hintnone") == 0) { | |
| 73 cairo_hint_style = CAIRO_HINT_STYLE_NONE; | |
| 74 } else if (strcmp(hint_style, "hintslight") == 0) { | |
| 75 cairo_hint_style = CAIRO_HINT_STYLE_SLIGHT; | |
| 76 } else if (strcmp(hint_style, "hintmedium") == 0) { | |
| 77 cairo_hint_style = CAIRO_HINT_STYLE_MEDIUM; | |
| 78 } else if (strcmp(hint_style, "hintfull") == 0) { | |
| 79 cairo_hint_style = CAIRO_HINT_STYLE_FULL; | |
| 80 } | |
| 81 cairo_font_options_set_hint_style(cairo_font_options, cairo_hint_style); | |
| 82 } | |
| 83 | |
| 84 if (hint_style) | |
| 85 g_free(hint_style); | |
| 86 if (rgba_style) | |
| 87 g_free(rgba_style); | |
| 88 } | |
| 89 | |
| 90 } // namespace | |
| 91 | |
| 92 namespace gfx { | |
| 93 | |
| 94 Canvas::Canvas(int width, int height, bool is_opaque) | |
| 95 : skia::PlatformCanvas(width, height, is_opaque) { | |
| 96 } | |
| 97 | |
| 98 Canvas::Canvas() : skia::PlatformCanvas() { | |
| 99 } | |
| 100 | |
| 101 Canvas::~Canvas() { | |
| 102 } | |
| 103 | |
| 104 // Pass a width > 0 to force wrapping and elliding. | |
| 105 static void SetupPangoLayout(PangoLayout* layout, | |
| 106 const std::wstring& text, | |
| 107 const gfx::Font& font, | |
| 108 int width, | |
| 109 int flags) { | |
| 110 if (!cairo_font_options) | |
| 111 UpdateCairoFontOptions(); | |
| 112 // This needs to be done early on; it has no effect when called just before | |
| 113 // pango_cairo_show_layout(). | |
| 114 pango_cairo_context_set_font_options( | |
| 115 pango_layout_get_context(layout), cairo_font_options); | |
| 116 | |
| 117 // Callers of DrawStringInt handle RTL layout themselves, so tell pango to not | |
| 118 // scope out RTL characters. | |
| 119 pango_layout_set_auto_dir(layout, FALSE); | |
| 120 | |
| 121 if (width > 0) | |
| 122 pango_layout_set_width(layout, width * PANGO_SCALE); | |
| 123 | |
| 124 if (flags & Canvas::NO_ELLIPSIS) { | |
| 125 pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE); | |
| 126 } else { | |
| 127 pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END); | |
| 128 } | |
| 129 | |
| 130 if (flags & Canvas::TEXT_ALIGN_CENTER) { | |
| 131 pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER); | |
| 132 } else if (flags & Canvas::TEXT_ALIGN_RIGHT) { | |
| 133 pango_layout_set_alignment(layout, PANGO_ALIGN_RIGHT); | |
| 134 } | |
| 135 | |
| 136 if (flags & Canvas::MULTI_LINE) { | |
| 137 pango_layout_set_wrap(layout, | |
| 138 (flags & Canvas::CHARACTER_BREAK) ? | |
| 139 PANGO_WRAP_WORD_CHAR : PANGO_WRAP_WORD); | |
| 140 } | |
| 141 | |
| 142 // Set the resolution to match that used by Gtk. If we don't set the | |
| 143 // resolution and the resolution differs from the default, Gtk and Chrome end | |
| 144 // up drawing at different sizes. | |
| 145 double resolution = gfx::GetPangoResolution(); | |
| 146 if (resolution > 0) { | |
| 147 pango_cairo_context_set_resolution(pango_layout_get_context(layout), | |
| 148 resolution); | |
| 149 } | |
| 150 | |
| 151 PangoFontDescription* desc = gfx::Font::PangoFontFromGfxFont(font); | |
| 152 pango_layout_set_font_description(layout, desc); | |
| 153 pango_font_description_free(desc); | |
| 154 | |
| 155 // Set text and accelerator character if needed. | |
| 156 std::string utf8 = WideToUTF8(text); | |
| 157 if (flags & gfx::Canvas::HIDE_PREFIX) { | |
| 158 // Escape the text string to be used as markup. | |
| 159 gchar* escaped_text = g_markup_escape_text(utf8.c_str(), utf8.size()); | |
| 160 pango_layout_set_markup_with_accel(layout, | |
| 161 escaped_text, | |
| 162 strlen(escaped_text), | |
| 163 kAcceleratorChar, NULL); | |
| 164 g_free(escaped_text); | |
| 165 } else { | |
| 166 pango_layout_set_text(layout, utf8.data(), utf8.size()); | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 // static | |
| 171 void Canvas::SizeStringInt(const std::wstring& text, | |
| 172 const gfx::Font& font, | |
| 173 int* width, int* height, int flags) { | |
| 174 int org_width = *width; | |
| 175 cairo_surface_t* surface = | |
| 176 cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 0, 0); | |
| 177 cairo_t* cr = cairo_create(surface); | |
| 178 PangoLayout* layout = pango_cairo_create_layout(cr); | |
| 179 | |
| 180 SetupPangoLayout(layout, text, font, *width, flags); | |
| 181 | |
| 182 pango_layout_get_pixel_size(layout, width, height); | |
| 183 | |
| 184 if (org_width > 0 && flags & Canvas::MULTI_LINE && | |
| 185 pango_layout_is_wrapped(layout)) { | |
| 186 // The text wrapped. There seems to be a bug in Pango when this happens | |
| 187 // such that the width returned from pango_layout_get_pixel_size is too | |
| 188 // small. Using the width from pango_layout_get_pixel_size in this case | |
| 189 // results in wrapping across more lines, which requires a bigger height. | |
| 190 // As a workaround we use the original width, which is not necessarily | |
| 191 // exactly correct, but isn't wrong by much. | |
| 192 // | |
| 193 // It looks like Pango uses the size of whitespace in calculating wrapping | |
| 194 // but doesn't include the size of the whitespace when the extents are | |
| 195 // asked for. See the loop in pango-layout.c process_item that determines | |
| 196 // where to wrap. | |
| 197 *width = org_width; | |
| 198 } | |
| 199 | |
| 200 g_object_unref(layout); | |
| 201 cairo_destroy(cr); | |
| 202 cairo_surface_destroy(surface); | |
| 203 } | |
| 204 | |
| 205 void Canvas::DrawStringInt(const std::wstring& text, | |
| 206 const gfx::Font& font, | |
| 207 const SkColor& color, | |
| 208 int x, int y, int w, int h, | |
| 209 int flags) { | |
| 210 if (w <= 0 || h <= 0) | |
| 211 return; | |
| 212 | |
| 213 cairo_t* cr = beginPlatformPaint(); | |
| 214 PangoLayout* layout = pango_cairo_create_layout(cr); | |
| 215 | |
| 216 SetupPangoLayout(layout, text, font, w, flags); | |
| 217 | |
| 218 pango_layout_set_height(layout, h * PANGO_SCALE); | |
| 219 | |
| 220 cairo_save(cr); | |
| 221 cairo_set_source_rgba(cr, | |
| 222 SkColorGetR(color) / 255.0, | |
| 223 SkColorGetG(color) / 255.0, | |
| 224 SkColorGetB(color) / 255.0, | |
| 225 SkColorGetA(color) / 255.0); | |
| 226 | |
| 227 int width, height; | |
| 228 pango_layout_get_pixel_size(layout, &width, &height); | |
| 229 | |
| 230 cairo_rectangle(cr, x, y, w, h); | |
| 231 cairo_clip(cr); | |
| 232 | |
| 233 if (flags & Canvas::TEXT_VALIGN_TOP) { | |
| 234 // Cairo should draw from the top left corner already. | |
| 235 } else if (flags & Canvas::TEXT_VALIGN_BOTTOM) { | |
| 236 y += (h - height); | |
| 237 } else { | |
| 238 // Vertically centered. | |
| 239 y += ((h - height) / 2); | |
| 240 } | |
| 241 | |
| 242 cairo_move_to(cr, x, y); | |
| 243 pango_cairo_show_layout(cr, layout); | |
| 244 if (font.style() & gfx::Font::UNDERLINED) { | |
| 245 double underline_y = | |
| 246 static_cast<double>(y) + height + font.underline_position(); | |
| 247 cairo_set_line_width(cr, font.underline_thickness()); | |
| 248 cairo_move_to(cr, x, underline_y); | |
| 249 cairo_line_to(cr, x + width, underline_y); | |
| 250 cairo_stroke(cr); | |
| 251 } | |
| 252 cairo_restore(cr); | |
| 253 | |
| 254 g_object_unref(layout); | |
| 255 // NOTE: beginPlatformPaint returned its surface, we shouldn't destroy it. | |
| 256 } | |
| 257 | |
| 258 void Canvas::DrawGdkPixbuf(GdkPixbuf* pixbuf, int x, int y) { | |
| 259 if (!pixbuf) { | |
| 260 NOTREACHED(); | |
| 261 return; | |
| 262 } | |
| 263 | |
| 264 cairo_t* cr = beginPlatformPaint(); | |
| 265 gdk_cairo_set_source_pixbuf(cr, pixbuf, x, y); | |
| 266 cairo_paint(cr); | |
| 267 } | |
| 268 | |
| 269 } // namespace gfx | |
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Chromium Code Reviews
Issue 2862025:
Canvas refactoring part 2.... (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/