chrome/browser/ui/libgtk2ui/gtk2_ui.cc

   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
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
   6
   7 #include <math.h>
   8 #include <set>
   9
  10 #include <pango/pango.h>
  11 #include <X11/Xlib.h>
  12
  13 #include "base/command_line.h"
  14 #include "base/debug/leak_annotations.h"
  15 #include "base/environment.h"
  16 #include "base/i18n/rtl.h"
  17 #include "base/logging.h"
  18 #include "base/nix/mime_util_xdg.h"
  19 #include "base/nix/xdg_util.h"
  20 #include "base/stl_util.h"
  21 #include "base/strings/string_split.h"
  22 #include "base/strings/stringprintf.h"
  23 #include "chrome/browser/themes/theme_properties.h"
  24 #include "chrome/browser/ui/libgtk2ui/app_indicator_icon.h"
  25 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
  26 #include "chrome/browser/ui/libgtk2ui/gtk2_border.h"
  27 #include "chrome/browser/ui/libgtk2ui/gtk2_event_loop.h"
  28 #include "chrome/browser/ui/libgtk2ui/gtk2_key_bindings_handler.h"
  29 #include "chrome/browser/ui/libgtk2ui/gtk2_signal_registrar.h"
  30 #include "chrome/browser/ui/libgtk2ui/gtk2_status_icon.h"
  31 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
  32 #include "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
  33 #include "chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h"
  34 #include "chrome/browser/ui/libgtk2ui/printing_gtk2_util.h"
  35 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
  36 #include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
  37 #include "chrome/browser/ui/libgtk2ui/unity_service.h"
  38 #include "chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h"
  39 #include "grit/components_scaled_resources.h"
  40 #include "grit/theme_resources.h"
  41 #include "printing/printing_context_linux.h"
  42 #include "third_party/skia/include/core/SkBitmap.h"
  43 #include "third_party/skia/include/core/SkCanvas.h"
  44 #include "third_party/skia/include/core/SkColor.h"
  45 #include "third_party/skia/include/core/SkShader.h"
  46 #include "ui/base/resource/resource_bundle.h"
  47 #include "ui/gfx/canvas.h"
  48 #include "ui/gfx/geometry/rect.h"
  49 #include "ui/gfx/geometry/size.h"
  50 #include "ui/gfx/image/image.h"
  51 #include "ui/gfx/skbitmap_operations.h"
  52 #include "ui/gfx/skia_util.h"
  53 #include "ui/gfx/x/x11_types.h"
  54 #include "ui/resources/grit/ui_resources.h"
  55 #include "ui/views/controls/button/label_button.h"
  56 #include "ui/views/controls/button/label_button_border.h"
  57 #include "ui/views/linux_ui/window_button_order_observer.h"
  58
  59 #if defined(USE_GCONF)
  60 #include "chrome/browser/ui/libgtk2ui/gconf_listener.h"
  61 #endif
  62
  63 // A minimized port of GtkThemeService into something that can provide colors
  64 // and images for aura.
  65 //
  66 // TODO(erg): There's still a lot that needs ported or done for the first time:
  67 //
  68 // - Render and inject the omnibox background.
  69 // - Make sure to test with a light on dark theme, too.
  70
  71 // Work around a header bug:
  72 // linux/debian_wheezy_i386-sysroot/usr/include/linux/stddef.h redefines NULL
  73 // to 0, which breaks -Wsentinel. Get back the normal definition of NULL.
  74 // TODO(thakis): Remove this once we update sysroots.
  75 #define __need_NULL
  76 #include <stddef.h>
  77
  78 namespace libgtk2ui {
  79
  80 namespace {
  81
  82 struct GObjectDeleter {
  83   void operator()(void* ptr) {
  84     g_object_unref(ptr);
  85   }
  86 };
  87 struct GtkIconInfoDeleter {
  88   void operator()(GtkIconInfo* ptr) {
  89     gtk_icon_info_free(ptr);
  90   }
  91 };
  92 typedef scoped_ptr<GIcon, GObjectDeleter> ScopedGIcon;
  93 typedef scoped_ptr<GtkIconInfo, GtkIconInfoDeleter> ScopedGtkIconInfo;
  94 typedef scoped_ptr<GdkPixbuf, GObjectDeleter> ScopedGdkPixbuf;
  95
  96 // Prefix for app indicator ids
  97 const char kAppIndicatorIdPrefix[] = "chrome_app_indicator_";
  98
  99 // Number of app indicators used (used as part of app-indicator id).
 100 int indicators_count;
 101
 102 // The unknown content type.
 103 const char* kUnknownContentType = "application/octet-stream";
 104
 105 // The size of the rendered toolbar image.
 106 const int kToolbarImageWidth = 64;
 107 const int kToolbarImageHeight = 128;
 108
 109 // How much to tint the GTK+ color lighter at the top of the window.
 110 const color_utils::HSL kGtkFrameShift = { -1, -1, 0.58 };
 111
 112 // How much to tint the GTK+ color when an explicit frame color hasn't been
 113 // specified.
 114 const color_utils::HSL kDefaultFrameShift = { -1, -1, 0.4 };
 115
 116 // Values used as the new luminance and saturation values in the inactive tab
 117 // text color.
 118 const double kDarkInactiveLuminance = 0.85;
 119 const double kLightInactiveLuminance = 0.15;
 120 const double kHeavyInactiveSaturation = 0.7;
 121 const double kLightInactiveSaturation = 0.3;
 122
 123 // Default color for links on the NTP when the GTK+ theme doesn't define a
 124 // link color. Constant taken from gtklinkbutton.c.
 125 const GdkColor kDefaultLinkColor = { 0, 0, 0, 0xeeee };
 126
 127 const int kSkiaToGDKMultiplier = 257;
 128
 129 // TODO(erg): ThemeService has a whole interface just for reading default
 130 // constants. Figure out what to do with that more long term; for now, just
 131 // copy the constants themselves here.
 132 //
 133 // Default tints.
 134 const color_utils::HSL kDefaultTintButtons = { -1, -1, -1 };
 135 const color_utils::HSL kDefaultTintFrame = { -1, -1, -1 };
 136 const color_utils::HSL kDefaultTintFrameInactive = { -1, -1, 0.75f };
 137 const color_utils::HSL kDefaultTintFrameIncognito = { -1, 0.2f, 0.35f };
 138 const color_utils::HSL kDefaultTintFrameIncognitoInactive = { -1, 0.3f, 0.6f };
 139 const color_utils::HSL kDefaultTintBackgroundTab = { -1, 0.5, 0.75 };
 140
 141 // A list of images that we provide while in gtk mode.
 142 //
 143 // TODO(erg): We list both the normal and *_DESKTOP versions of some of these
 144 // images because in some contexts, we don't go through the
 145 // chrome::MapThemeImage interface. That should be fixed, but tracking that
 146 // down is Hard.
 147 const int kThemeImages[] = {
 148   IDR_THEME_TOOLBAR,
 149   IDR_THEME_TAB_BACKGROUND,
 150   IDR_THEME_TAB_BACKGROUND_DESKTOP,
 151   IDR_THEME_TAB_BACKGROUND_INCOGNITO,
 152   IDR_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP,
 153   IDR_FRAME,
 154   IDR_FRAME_INACTIVE,
 155   IDR_THEME_FRAME,
 156   IDR_THEME_FRAME_INACTIVE,
 157   IDR_THEME_FRAME_INCOGNITO,
 158   IDR_THEME_FRAME_INCOGNITO_INACTIVE,
 159 };
 160
 161 // A list of icons used in the autocomplete view that should be tinted to the
 162 // current gtk theme selection color so they stand out against the GtkEntry's
 163 // base color.
 164 // TODO(erg): Decide what to do about other icons that appear in the omnibox,
 165 // e.g. content settings icons.
 166 const int kAutocompleteImages[] = {
 167   IDR_OMNIBOX_CALCULATOR,
 168   IDR_OMNIBOX_EXTENSION_APP,
 169   IDR_OMNIBOX_HTTP,
 170   IDR_OMNIBOX_HTTP_DARK,
 171   IDR_OMNIBOX_SEARCH,
 172   IDR_OMNIBOX_SEARCH_DARK,
 173   IDR_OMNIBOX_STAR,
 174   IDR_OMNIBOX_STAR_DARK,
 175   IDR_OMNIBOX_TTS,
 176   IDR_OMNIBOX_TTS_DARK,
 177 };
 178
 179 // This table converts button ids into a pair of gtk-stock id and state.
 180 struct IDRGtkMapping {
 181   int idr;
 182   const char* stock_id;
 183   GtkStateType gtk_state;
 184 } const kGtkIcons[] = {
 185   { IDR_BACK,      GTK_STOCK_GO_BACK,    GTK_STATE_NORMAL },
 186   { IDR_BACK_D,    GTK_STOCK_GO_BACK,    GTK_STATE_INSENSITIVE },
 187
 188   { IDR_FORWARD,   GTK_STOCK_GO_FORWARD, GTK_STATE_NORMAL },
 189   { IDR_FORWARD_D, GTK_STOCK_GO_FORWARD, GTK_STATE_INSENSITIVE },
 190
 191   { IDR_HOME,      GTK_STOCK_HOME,       GTK_STATE_NORMAL },
 192
 193   { IDR_RELOAD,    GTK_STOCK_REFRESH,    GTK_STATE_NORMAL },
 194   { IDR_RELOAD_D,  GTK_STOCK_REFRESH,    GTK_STATE_INSENSITIVE },
 195
 196   { IDR_STOP,      GTK_STOCK_STOP,       GTK_STATE_NORMAL },
 197   { IDR_STOP_D,    GTK_STOCK_STOP,       GTK_STATE_INSENSITIVE },
 198 };
 199
 200 // The image resources that will be tinted by the 'button' tint value.
 201 const int kOtherToolbarButtonIDs[] = {
 202   IDR_TOOLBAR_BEZEL_HOVER,
 203   IDR_TOOLBAR_BEZEL_PRESSED,
 204   IDR_BROWSER_ACTIONS_OVERFLOW,
 205
 206   // TODO(erg): The dropdown arrow should be tinted because we're injecting
 207   // various background GTK colors, but the code that accesses them needs to be
 208   // modified so that they ask their ui::ThemeProvider instead of the
 209   // ResourceBundle. (i.e. in a light on dark theme, the dropdown arrow will be
 210   // dark on dark)
 211   IDR_MENU_DROPARROW
 212 };
 213
 214 bool IsOverridableImage(int id) {
 215   CR_DEFINE_STATIC_LOCAL(std::set<int>, images, ());
 216   if (images.empty()) {
 217     images.insert(kThemeImages, kThemeImages + arraysize(kThemeImages));
 218     images.insert(kAutocompleteImages,
 219                   kAutocompleteImages + arraysize(kAutocompleteImages));
 220
 221     for (unsigned int i = 0; i < arraysize(kGtkIcons); ++i)
 222       images.insert(kGtkIcons[i].idr);
 223
 224     images.insert(kOtherToolbarButtonIDs,
 225                   kOtherToolbarButtonIDs + arraysize(kOtherToolbarButtonIDs));
 226   }
 227
 228   return images.count(id) > 0;
 229 }
 230
 231 // Picks a button tint from a set of background colors. While
 232 // |accent_gdk_color| will usually be the same color through a theme, this
 233 // function will get called with the normal GtkLabel |text_color|/GtkWindow
 234 // |background_color| pair and the GtkEntry |text_color|/|background_color|
 235 // pair. While 3/4 of the time the resulting tint will be the same, themes that
 236 // have a dark window background (with light text) and a light text entry (with
 237 // dark text) will get better icons with this separated out.
 238 void PickButtonTintFromColors(const GdkColor& accent_gdk_color,
 239                               const GdkColor& text_color,
 240                               const GdkColor& background_color,
 241                               color_utils::HSL* tint) {
 242   SkColor accent_color = GdkColorToSkColor(accent_gdk_color);
 243   color_utils::HSL accent_tint;
 244   color_utils::SkColorToHSL(accent_color, &accent_tint);
 245
 246   color_utils::HSL text_tint;
 247   color_utils::SkColorToHSL(GdkColorToSkColor(text_color),
 248                             &text_tint);
 249
 250   color_utils::HSL background_tint;
 251   color_utils::SkColorToHSL(GdkColorToSkColor(background_color),
 252                             &background_tint);
 253
 254   // If the accent color is gray, then our normal HSL tomfoolery will bring out
 255   // whatever color is oddly dominant (for example, in rgb space [125, 128,
 256   // 125] will tint green instead of gray). Slight differences (+/-10 (4%) to
 257   // all color components) should be interpreted as this color being gray and
 258   // we should switch into a special grayscale mode.
 259   int rb_diff = abs(static_cast<int>(SkColorGetR(accent_color)) -
 260                     static_cast<int>(SkColorGetB(accent_color)));
 261   int rg_diff = abs(static_cast<int>(SkColorGetR(accent_color)) -
 262                     static_cast<int>(SkColorGetG(accent_color)));
 263   int bg_diff = abs(static_cast<int>(SkColorGetB(accent_color)) -
 264                     static_cast<int>(SkColorGetG(accent_color)));
 265   if (rb_diff < 10 && rg_diff < 10 && bg_diff < 10) {
 266     // Our accent is white/gray/black. Only the luminance of the accent color
 267     // matters.
 268     tint->h = -1;
 269
 270     // Use the saturation of the text.
 271     tint->s = text_tint.s;
 272
 273     // Use the luminance of the accent color UNLESS there isn't enough
 274     // luminance contrast between the accent color and the base color.
 275     if (fabs(accent_tint.l - background_tint.l) > 0.3)
 276       tint->l = accent_tint.l;
 277     else
 278       tint->l = text_tint.l;
 279   } else {
 280     // Our accent is a color.
 281     tint->h = accent_tint.h;
 282
 283     // Don't modify the saturation; the amount of color doesn't matter.
 284     tint->s = -1;
 285
 286     // If the text wants us to darken the icon, don't change the luminance (the
 287     // icons are already dark enough). Otherwise, lighten the icon by no more
 288     // than 0.9 since we don't want a pure-white icon even if the text is pure
 289     // white.
 290     if (text_tint.l < 0.5)
 291       tint->l = -1;
 292     else if (text_tint.l <= 0.9)
 293       tint->l = text_tint.l;
 294     else
 295       tint->l = 0.9;
 296   }
 297 }
 298
 299 // Applies an HSL shift to a GdkColor (instead of an SkColor)
 300 void GdkColorHSLShift(const color_utils::HSL& shift, GdkColor* frame_color) {
 301   SkColor shifted = color_utils::HSLShift(
 302       GdkColorToSkColor(*frame_color), shift);
 303
 304   frame_color->pixel = 0;
 305   frame_color->red = SkColorGetR(shifted) * kSkiaToGDKMultiplier;
 306   frame_color->green = SkColorGetG(shifted) * kSkiaToGDKMultiplier;
 307   frame_color->blue = SkColorGetB(shifted) * kSkiaToGDKMultiplier;
 308 }
 309
 310 // Copied Default blah sections from ThemeService.
 311 color_utils::HSL GetDefaultTint(int id) {
 312   switch (id) {
 313     case ThemeProperties::TINT_FRAME:
 314       return kDefaultTintFrame;
 315     case ThemeProperties::TINT_FRAME_INACTIVE:
 316       return kDefaultTintFrameInactive;
 317     case ThemeProperties::TINT_FRAME_INCOGNITO:
 318       return kDefaultTintFrameIncognito;
 319     case ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE:
 320       return kDefaultTintFrameIncognitoInactive;
 321     case ThemeProperties::TINT_BUTTONS:
 322       return kDefaultTintButtons;
 323     case ThemeProperties::TINT_BACKGROUND_TAB:
 324       return kDefaultTintBackgroundTab;
 325     default:
 326       color_utils::HSL result = {-1, -1, -1};
 327       return result;
 328   }
 329 }
 330
 331 // Returns a gfx::FontRenderParams corresponding to GTK's configuration.
 332 gfx::FontRenderParams GetGtkFontRenderParams() {
 333   GtkSettings* gtk_settings = gtk_settings_get_default();
 334   CHECK(gtk_settings);
 335   gint antialias = 0;
 336   gint hinting = 0;
 337   gchar* hint_style = NULL;
 338   gchar* rgba = NULL;
 339   g_object_get(gtk_settings,
 340                "gtk-xft-antialias", &antialias,
 341                "gtk-xft-hinting", &hinting,
 342                "gtk-xft-hintstyle", &hint_style,
 343                "gtk-xft-rgba", &rgba,
 344                NULL);
 345
 346   gfx::FontRenderParams params;
 347   params.antialiasing = antialias != 0;
 348
 349   if (hinting == 0 || !hint_style || strcmp(hint_style, "hintnone") == 0) {
 350     params.hinting = gfx::FontRenderParams::HINTING_NONE;
 351   } else if (strcmp(hint_style, "hintslight") == 0) {
 352     params.hinting = gfx::FontRenderParams::HINTING_SLIGHT;
 353   } else if (strcmp(hint_style, "hintmedium") == 0) {
 354     params.hinting = gfx::FontRenderParams::HINTING_MEDIUM;
 355   } else if (strcmp(hint_style, "hintfull") == 0) {
 356     params.hinting = gfx::FontRenderParams::HINTING_FULL;
 357   } else {
 358     LOG(WARNING) << "Unexpected gtk-xft-hintstyle \"" << hint_style << "\"";
 359     params.hinting = gfx::FontRenderParams::HINTING_NONE;
 360   }
 361
 362   if (!rgba || strcmp(rgba, "none") == 0) {
 363     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE;
 364   } else if (strcmp(rgba, "rgb") == 0) {
 365     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_RGB;
 366   } else if (strcmp(rgba, "bgr") == 0) {
 367     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_BGR;
 368   } else if (strcmp(rgba, "vrgb") == 0) {
 369     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_VRGB;
 370   } else if (strcmp(rgba, "vbgr") == 0) {
 371     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_VBGR;
 372   } else {
 373     LOG(WARNING) << "Unexpected gtk-xft-rgba \"" << rgba << "\"";
 374     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE;
 375   }
 376
 377   g_free(hint_style);
 378   g_free(rgba);
 379
 380   return params;
 381 }
 382
 383 double GetBaseDPI() {
 384   XDisplay* xdisplay = gfx::GetXDisplay();
 385   int xscreen = DefaultScreen(xdisplay);
 386   return (DisplayHeight(xdisplay, xscreen) * 25.4) /
 387          DisplayHeightMM(xdisplay, xscreen);
 388 }
 389
 390 double GetFontDPI() {
 391   GtkSettings* gtk_settings = gtk_settings_get_default();
 392   CHECK(gtk_settings);
 393   gint gtk_dpi = -1;
 394   g_object_get(gtk_settings, "gtk-xft-dpi", &gtk_dpi, NULL);
 395
 396   // GTK multiplies the DPI by 1024 before storing it.
 397   return (gtk_dpi > 0) ? gtk_dpi / 1024.0 : GetBaseDPI();
 398 }
 399
 400 // Queries GTK for its font DPI setting and returns the number of pixels in a
 401 // point.
 402 double GetPixelsInPoint(float device_scale_factor) {
 403   double dpi = GetFontDPI();
 404
 405   // Take device_scale_factor into account — if Chrome already scales the
 406   // entire UI up by 2x, we should not also scale up.
 407   dpi /= device_scale_factor;
 408
 409   // There are 72 points in an inch.
 410   return dpi / 72.0;
 411 }
 412
 413 views::LinuxUI::NonClientMiddleClickAction GetDefaultMiddleClickAction() {
 414   scoped_ptr<base::Environment> env(base::Environment::Create());
 415   switch (base::nix::GetDesktopEnvironment(env.get())) {
 416     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
 417       // Starting with KDE 4.4, windows' titlebars can be dragged with the
 418       // middle mouse button to create tab groups. We don't support that in
 419       // Chrome, but at least avoid lowering windows in response to middle
 420       // clicks to avoid surprising users who expect the KDE behavior.
 421       return views::LinuxUI::MIDDLE_CLICK_ACTION_NONE;
 422     default:
 423       return views::LinuxUI::MIDDLE_CLICK_ACTION_LOWER;
 424   }
 425 }
 426
 427 }  // namespace
 428
 429 Gtk2UI::Gtk2UI()
 430     : default_font_size_pixels_(0),
 431       default_font_style_(gfx::Font::NORMAL),
 432       middle_click_action_(GetDefaultMiddleClickAction()),
 433       device_scale_factor_(1.0) {
 434   GtkInitFromCommandLine(*base::CommandLine::ForCurrentProcess());
 435 }
 436
 437 void Gtk2UI::Initialize() {
 438   signals_.reset(new Gtk2SignalRegistrar);
 439
 440   // Create our fake widgets.
 441   fake_window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 442   fake_frame_ = chrome_gtk_frame_new();
 443   fake_label_.Own(gtk_label_new(""));
 444   fake_entry_.Own(gtk_entry_new());
 445
 446   // Only realized widgets receive style-set notifications, which we need to
 447   // broadcast new theme images and colors. Only realized widgets have style
 448   // properties, too, which we query for some colors.
 449   gtk_widget_realize(fake_frame_);
 450   gtk_widget_realize(fake_window_);
 451
 452   signals_->Connect(fake_frame_, "style-set",
 453                     G_CALLBACK(&OnStyleSetThunk), this);
 454
 455   LoadGtkValues();
 456
 457   printing::PrintingContextLinux::SetCreatePrintDialogFunction(
 458       &PrintDialogGtk2::CreatePrintDialog);
 459   printing::PrintingContextLinux::SetPdfPaperSizeFunction(
 460       &GetPdfPaperSizeDeviceUnitsGtk);
 461
 462 #if defined(USE_GCONF)
 463   // We must build this after GTK gets initialized.
 464   gconf_listener_.reset(new GConfListener(this));
 465 #endif  // defined(USE_GCONF)
 466
 467   indicators_count = 0;
 468
 469   // Instantiate the singleton instance of Gtk2EventLoop.
 470   Gtk2EventLoop::GetInstance();
 471 }
 472
 473 Gtk2UI::~Gtk2UI() {
 474   gtk_widget_destroy(fake_window_);
 475   gtk_widget_destroy(fake_frame_);
 476   fake_label_.Destroy();
 477   fake_entry_.Destroy();
 478
 479   ClearAllThemeData();
 480 }
 481
 482 gfx::Image Gtk2UI::GetThemeImageNamed(int id) const {
 483   // Try to get our cached version:
 484   ImageCache::const_iterator it = gtk_images_.find(id);
 485   if (it != gtk_images_.end())
 486     return it->second;
 487
 488   if (IsOverridableImage(id)) {
 489     gfx::Image image = gfx::Image(
 490         gfx::ImageSkia::CreateFrom1xBitmap(GenerateGtkThemeBitmap(id)));
 491     gtk_images_[id] = image;
 492     return image;
 493   }
 494
 495   return gfx::Image();
 496 }
 497
 498 bool Gtk2UI::GetColor(int id, SkColor* color) const {
 499   ColorMap::const_iterator it = colors_.find(id);
 500   if (it != colors_.end()) {
 501     *color = it->second;
 502     return true;
 503   }
 504
 505   return false;
 506 }
 507
 508 bool Gtk2UI::HasCustomImage(int id) const {
 509   return IsOverridableImage(id);
 510 }
 511
 512 SkColor Gtk2UI::GetFocusRingColor() const {
 513   return focus_ring_color_;
 514 }
 515
 516 SkColor Gtk2UI::GetThumbActiveColor() const {
 517   return thumb_active_color_;
 518 }
 519
 520 SkColor Gtk2UI::GetThumbInactiveColor() const {
 521   return thumb_inactive_color_;
 522 }
 523
 524 SkColor Gtk2UI::GetTrackColor() const {
 525   return track_color_;
 526 }
 527
 528 SkColor Gtk2UI::GetActiveSelectionBgColor() const {
 529   return active_selection_bg_color_;
 530 }
 531
 532 SkColor Gtk2UI::GetActiveSelectionFgColor() const {
 533   return active_selection_fg_color_;
 534 }
 535
 536 SkColor Gtk2UI::GetInactiveSelectionBgColor() const {
 537   return inactive_selection_bg_color_;
 538 }
 539
 540 SkColor Gtk2UI::GetInactiveSelectionFgColor() const {
 541   return inactive_selection_fg_color_;
 542 }
 543
 544 double Gtk2UI::GetCursorBlinkInterval() const {
 545   // From http://library.gnome.org/devel/gtk/unstable/GtkSettings.html, this is
 546   // the default value for gtk-cursor-blink-time.
 547   static const gint kGtkDefaultCursorBlinkTime = 1200;
 548
 549   // Dividing GTK's cursor blink cycle time (in milliseconds) by this value
 550   // yields an appropriate value for
 551   // content::RendererPreferences::caret_blink_interval.  This matches the
 552   // logic in the WebKit GTK port.
 553   static const double kGtkCursorBlinkCycleFactor = 2000.0;
 554
 555   gint cursor_blink_time = kGtkDefaultCursorBlinkTime;
 556   gboolean cursor_blink = TRUE;
 557   g_object_get(gtk_settings_get_default(),
 558                "gtk-cursor-blink-time", &cursor_blink_time,
 559                "gtk-cursor-blink", &cursor_blink,
 560                NULL);
 561   return cursor_blink ? (cursor_blink_time / kGtkCursorBlinkCycleFactor) : 0.0;
 562 }
 563
 564 ui::NativeTheme* Gtk2UI::GetNativeTheme(aura::Window* window) const {
 565   ui::NativeTheme* native_theme_override = NULL;
 566   if (!native_theme_overrider_.is_null())
 567     native_theme_override = native_theme_overrider_.Run(window);
 568
 569   if (native_theme_override)
 570     return native_theme_override;
 571
 572   return NativeThemeGtk2::instance();
 573 }
 574
 575 void Gtk2UI::SetNativeThemeOverride(const NativeThemeGetter& callback) {
 576   native_theme_overrider_ = callback;
 577 }
 578
 579 bool Gtk2UI::GetDefaultUsesSystemTheme() const {
 580   scoped_ptr<base::Environment> env(base::Environment::Create());
 581
 582   switch (base::nix::GetDesktopEnvironment(env.get())) {
 583     case base::nix::DESKTOP_ENVIRONMENT_GNOME:
 584     case base::nix::DESKTOP_ENVIRONMENT_UNITY:
 585     case base::nix::DESKTOP_ENVIRONMENT_XFCE:
 586       return true;
 587     case base::nix::DESKTOP_ENVIRONMENT_KDE3:
 588     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
 589     case base::nix::DESKTOP_ENVIRONMENT_OTHER:
 590       return false;
 591   }
 592   // Unless GetDesktopEnvironment() badly misbehaves, this should never happen.
 593   NOTREACHED();
 594   return false;
 595 }
 596
 597 void Gtk2UI::SetDownloadCount(int count) const {
 598   if (unity::IsRunning())
 599     unity::SetDownloadCount(count);
 600 }
 601
 602 void Gtk2UI::SetProgressFraction(float percentage) const {
 603   if (unity::IsRunning())
 604     unity::SetProgressFraction(percentage);
 605 }
 606
 607 bool Gtk2UI::IsStatusIconSupported() const {
 608   return true;
 609 }
 610
 611 scoped_ptr<views::StatusIconLinux> Gtk2UI::CreateLinuxStatusIcon(
 612     const gfx::ImageSkia& image,
 613     const base::string16& tool_tip) const {
 614   if (AppIndicatorIcon::CouldOpen()) {
 615     ++indicators_count;
 616     return scoped_ptr<views::StatusIconLinux>(new AppIndicatorIcon(
 617         base::StringPrintf("%s%d", kAppIndicatorIdPrefix, indicators_count),
 618         image,
 619         tool_tip));
 620   } else {
 621     return scoped_ptr<views::StatusIconLinux>(new Gtk2StatusIcon(
 622         image, tool_tip));
 623   }
 624 }
 625
 626 gfx::Image Gtk2UI::GetIconForContentType(
 627     const std::string& content_type,
 628     int size) const {
 629   // This call doesn't take a reference.
 630   GtkIconTheme* theme = gtk_icon_theme_get_default();
 631
 632   std::string content_types[] = {
 633     content_type, kUnknownContentType
 634   };
 635
 636   for (size_t i = 0; i < arraysize(content_types); ++i) {
 637     ScopedGIcon icon(g_content_type_get_icon(content_types[i].c_str()));
 638     ScopedGtkIconInfo icon_info(
 639         gtk_icon_theme_lookup_by_gicon(
 640             theme, icon.get(), size,
 641             static_cast<GtkIconLookupFlags>(GTK_ICON_LOOKUP_FORCE_SIZE)));
 642     if (!icon_info)
 643       continue;
 644     ScopedGdkPixbuf pixbuf(gtk_icon_info_load_icon(icon_info.get(), NULL));
 645     if (!pixbuf)
 646       continue;
 647
 648     SkBitmap bitmap = GdkPixbufToImageSkia(pixbuf.get());
 649     DCHECK_EQ(size, bitmap.width());
 650     DCHECK_EQ(size, bitmap.height());
 651     gfx::ImageSkia image_skia = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
 652     image_skia.MakeThreadSafe();
 653     return gfx::Image(image_skia);
 654   }
 655   return gfx::Image();
 656 }
 657
 658 scoped_ptr<views::Border> Gtk2UI::CreateNativeBorder(
 659     views::LabelButton* owning_button,
 660     scoped_ptr<views::LabelButtonBorder> border) {
 661   if (owning_button->GetNativeTheme() != NativeThemeGtk2::instance())
 662     return border.Pass();
 663
 664   return make_scoped_ptr(new Gtk2Border(this, owning_button, border.Pass()));
 665 }
 666
 667 void Gtk2UI::AddWindowButtonOrderObserver(
 668     views::WindowButtonOrderObserver* observer) {
 669   if (!leading_buttons_.empty() || !trailing_buttons_.empty()) {
 670     observer->OnWindowButtonOrderingChange(leading_buttons_,
 671                                            trailing_buttons_);
 672   }
 673
 674   observer_list_.AddObserver(observer);
 675 }
 676
 677 void Gtk2UI::RemoveWindowButtonOrderObserver(
 678     views::WindowButtonOrderObserver* observer) {
 679   observer_list_.RemoveObserver(observer);
 680 }
 681
 682 void Gtk2UI::SetWindowButtonOrdering(
 683     const std::vector<views::FrameButton>& leading_buttons,
 684     const std::vector<views::FrameButton>& trailing_buttons) {
 685   leading_buttons_ = leading_buttons;
 686   trailing_buttons_ = trailing_buttons;
 687
 688   FOR_EACH_OBSERVER(views::WindowButtonOrderObserver, observer_list_,
 689                     OnWindowButtonOrderingChange(leading_buttons_,
 690                                                  trailing_buttons_));
 691 }
 692
 693 void Gtk2UI::SetNonClientMiddleClickAction(NonClientMiddleClickAction action) {
 694   middle_click_action_ = action;
 695 }
 696
 697 scoped_ptr<ui::LinuxInputMethodContext> Gtk2UI::CreateInputMethodContext(
 698     ui::LinuxInputMethodContextDelegate* delegate,
 699     bool is_simple) const {
 700   return scoped_ptr<ui::LinuxInputMethodContext>(
 701       new X11InputMethodContextImplGtk2(delegate, is_simple));
 702 }
 703
 704 gfx::FontRenderParams Gtk2UI::GetDefaultFontRenderParams() const {
 705   static gfx::FontRenderParams params = GetGtkFontRenderParams();
 706   return params;
 707 }
 708
 709 void Gtk2UI::GetDefaultFontDescription(
 710     std::string* family_out,
 711     int* size_pixels_out,
 712     int* style_out,
 713     gfx::FontRenderParams* params_out) const {
 714   *family_out = default_font_family_;
 715   *size_pixels_out = default_font_size_pixels_;
 716   *style_out = default_font_style_;
 717   *params_out = default_font_render_params_;
 718 }
 719
 720 ui::SelectFileDialog* Gtk2UI::CreateSelectFileDialog(
 721     ui::SelectFileDialog::Listener* listener,
 722     ui::SelectFilePolicy* policy) const {
 723   return SelectFileDialogImpl::Create(listener, policy);
 724 }
 725
 726 bool Gtk2UI::UnityIsRunning() {
 727   return unity::IsRunning();
 728 }
 729
 730 views::LinuxUI::NonClientMiddleClickAction
 731 Gtk2UI::GetNonClientMiddleClickAction() {
 732   return middle_click_action_;
 733 }
 734
 735 void Gtk2UI::NotifyWindowManagerStartupComplete() {
 736   // TODO(port) Implement this using _NET_STARTUP_INFO_BEGIN/_NET_STARTUP_INFO
 737   // from http://standards.freedesktop.org/startup-notification-spec/ instead.
 738   gdk_notify_startup_complete();
 739 }
 740
 741 bool Gtk2UI::MatchEvent(const ui::Event& event,
 742                         std::vector<ui::TextEditCommandAuraLinux>* commands) {
 743   // Ensure that we have a keyboard handler.
 744   if (!key_bindings_handler_)
 745     key_bindings_handler_.reset(new Gtk2KeyBindingsHandler);
 746
 747   return key_bindings_handler_->MatchEvent(event, commands);
 748 }
 749
 750 void Gtk2UI::GetScrollbarColors(GdkColor* thumb_active_color,
 751                                 GdkColor* thumb_inactive_color,
 752                                 GdkColor* track_color) {
 753   GdkColor* theme_thumb_active = NULL;
 754   GdkColor* theme_thumb_inactive = NULL;
 755   GdkColor* theme_trough_color = NULL;
 756   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
 757                        "scrollbar-slider-prelight-color", &theme_thumb_active,
 758                        "scrollbar-slider-normal-color", &theme_thumb_inactive,
 759                        "scrollbar-trough-color", &theme_trough_color,
 760                        NULL);
 761
 762   // Ask the theme if the theme specifies all the scrollbar colors and short
 763   // circuit the expensive painting/compositing if we have all of them.
 764   if (theme_thumb_active && theme_thumb_inactive && theme_trough_color) {
 765     *thumb_active_color = *theme_thumb_active;
 766     *thumb_inactive_color = *theme_thumb_inactive;
 767     *track_color = *theme_trough_color;
 768
 769     gdk_color_free(theme_thumb_active);
 770     gdk_color_free(theme_thumb_inactive);
 771     gdk_color_free(theme_trough_color);
 772     return;
 773   }
 774
 775   // Create window containing scrollbar elements
 776   GtkWidget* window    = gtk_window_new(GTK_WINDOW_POPUP);
 777   GtkWidget* fixed     = gtk_fixed_new();
 778   GtkWidget* scrollbar = gtk_hscrollbar_new(NULL);
 779   gtk_container_add(GTK_CONTAINER(window), fixed);
 780   gtk_container_add(GTK_CONTAINER(fixed),  scrollbar);
 781   gtk_widget_realize(window);
 782   gtk_widget_realize(scrollbar);
 783
 784   // Draw scrollbar thumb part and track into offscreen image
 785   const int kWidth  = 100;
 786   const int kHeight = 20;
 787   GtkStyle* style   = gtk_rc_get_style(scrollbar);
 788   GdkWindow* gdk_window = gtk_widget_get_window(window);
 789   GdkPixmap* pm     = gdk_pixmap_new(gdk_window, kWidth, kHeight, -1);
 790   GdkRectangle rect = { 0, 0, kWidth, kHeight };
 791   unsigned char data[3 * kWidth * kHeight];
 792   for (int i = 0; i < 3; ++i) {
 793     if (i < 2) {
 794       // Thumb part
 795       gtk_paint_slider(style, pm,
 796                        i == 0 ? GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
 797                        GTK_SHADOW_OUT, &rect, scrollbar, "slider", 0, 0,
 798                        kWidth, kHeight, GTK_ORIENTATION_HORIZONTAL);
 799     } else {
 800       // Track
 801       gtk_paint_box(style, pm, GTK_STATE_ACTIVE, GTK_SHADOW_IN, &rect,
 802                     scrollbar, "trough-upper", 0, 0, kWidth, kHeight);
 803     }
 804     GdkPixbuf* pb = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB,
 805                                              FALSE, 8, kWidth, kHeight,
 806                                              3 * kWidth, 0, 0);
 807     gdk_pixbuf_get_from_drawable(pb, pm, NULL, 0, 0, 0, 0, kWidth, kHeight);
 808
 809     // Sample pixels
 810     int components[3] = { 0 };
 811     for (int y = 2; y < kHeight - 2; ++y) {
 812       for (int c = 0; c < 3; ++c) {
 813         // Sample a vertical slice of pixels at about one-thirds from the
 814         // left edge. This allows us to avoid any fixed graphics that might be
 815         // located at the edges or in the center of the scrollbar.
 816         // Each pixel is made up of a red, green, and blue component; taking up
 817         // a total of three bytes.
 818         components[c] += data[3 * (kWidth / 3 + y * kWidth) + c];
 819       }
 820     }
 821     GdkColor* color = i == 0 ? thumb_active_color :
 822                       i == 1 ? thumb_inactive_color :
 823                                track_color;
 824     color->pixel = 0;
 825     // We sampled pixels across the full height of the image, ignoring a two
 826     // pixel border. In some themes, the border has a completely different
 827     // color which we do not want to factor into our average color computation.
 828     //
 829     // We now need to scale the colors from the 0..255 range, to the wider
 830     // 0..65535 range, and we need to actually compute the average color; so,
 831     // we divide by the total number of pixels in the sample.
 832     color->red   = components[0] * 65535 / (255 * (kHeight - 4));
 833     color->green = components[1] * 65535 / (255 * (kHeight - 4));
 834     color->blue  = components[2] * 65535 / (255 * (kHeight - 4));
 835
 836     g_object_unref(pb);
 837   }
 838   g_object_unref(pm);
 839
 840   gtk_widget_destroy(window);
 841
 842   // Override any of the default colors with ones that were specified by the
 843   // theme.
 844   if (theme_thumb_active) {
 845     *thumb_active_color = *theme_thumb_active;
 846     gdk_color_free(theme_thumb_active);
 847   }
 848
 849   if (theme_thumb_inactive) {
 850     *thumb_inactive_color = *theme_thumb_inactive;
 851     gdk_color_free(theme_thumb_inactive);
 852   }
 853
 854   if (theme_trough_color) {
 855     *track_color = *theme_trough_color;
 856     gdk_color_free(theme_trough_color);
 857   }
 858 }
 859
 860 void Gtk2UI::LoadGtkValues() {
 861   // TODO(erg): GtkThemeService had a comment here about having to muck with
 862   // the raw Prefs object to remove prefs::kCurrentThemeImages or else we'd
 863   // regress startup time. Figure out how to do that when we can't access the
 864   // prefs system from here.
 865
 866   GtkStyle* frame_style = gtk_rc_get_style(fake_frame_);
 867
 868   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
 869   SetThemeColorFromGtk(ThemeProperties::COLOR_CONTROL_BACKGROUND,
 870                        &window_style->bg[GTK_STATE_NORMAL]);
 871
 872   GdkColor toolbar_color = window_style->bg[GTK_STATE_NORMAL];
 873   SetThemeColorFromGtk(ThemeProperties::COLOR_TOOLBAR, &toolbar_color);
 874
 875   GdkColor button_color = window_style->bg[GTK_STATE_SELECTED];
 876   SetThemeTintFromGtk(ThemeProperties::TINT_BUTTONS, &button_color);
 877
 878   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
 879   GdkColor label_color = label_style->fg[GTK_STATE_NORMAL];
 880   SetThemeColorFromGtk(ThemeProperties::COLOR_TAB_TEXT, &label_color);
 881   SetThemeColorFromGtk(ThemeProperties::COLOR_BOOKMARK_TEXT, &label_color);
 882   SetThemeColorFromGtk(ThemeProperties::COLOR_STATUS_BAR_TEXT, &label_color);
 883
 884   UpdateDefaultFont(label_style->font_desc);
 885
 886   // Build the various icon tints.
 887   GetNormalButtonTintHSL(&button_tint_);
 888   GetNormalEntryForegroundHSL(&entry_tint_);
 889   GetSelectedEntryForegroundHSL(&selected_entry_tint_);
 890   GdkColor frame_color = BuildFrameColors(frame_style);
 891
 892   // The inactive frame color never occurs naturally in the theme, as it is a
 893   // tinted version of |frame_color|. We generate another color based on the
 894   // background tab color, with the lightness and saturation moved in the
 895   // opposite direction. (We don't touch the hue, since there should be subtle
 896   // hints of the color in the text.)
 897   color_utils::HSL inactive_tab_text_hsl =
 898       tints_[ThemeProperties::TINT_BACKGROUND_TAB];
 899   if (inactive_tab_text_hsl.l < 0.5)
 900     inactive_tab_text_hsl.l = kDarkInactiveLuminance;
 901   else
 902     inactive_tab_text_hsl.l = kLightInactiveLuminance;
 903
 904   if (inactive_tab_text_hsl.s < 0.5)
 905     inactive_tab_text_hsl.s = kHeavyInactiveSaturation;
 906   else
 907     inactive_tab_text_hsl.s = kLightInactiveSaturation;
 908
 909   colors_[ThemeProperties::COLOR_BACKGROUND_TAB_TEXT] =
 910       color_utils::HSLToSkColor(inactive_tab_text_hsl, 255);
 911
 912   // We pick the text and background colors for the NTP out of the colors for a
 913   // GtkEntry. We do this because GtkEntries background color is never the same
 914   // as |toolbar_color|, is usually a white, and when it isn't a white,
 915   // provides sufficient contrast to |toolbar_color|. Try this out with
 916   // Darklooks, HighContrastInverse or ThinIce.
 917   GtkStyle* entry_style = gtk_rc_get_style(fake_entry_.get());
 918   GdkColor ntp_background = entry_style->base[GTK_STATE_NORMAL];
 919   GdkColor ntp_foreground = entry_style->text[GTK_STATE_NORMAL];
 920   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_BACKGROUND,
 921                        &ntp_background);
 922   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_TEXT,
 923                        &ntp_foreground);
 924
 925   // The NTP header is the color that surrounds the current active thumbnail on
 926   // the NTP, and acts as the border of the "Recent Links" box. It would be
 927   // awesome if they were separated so we could use GetBorderColor() for the
 928   // border around the "Recent Links" section, but matching the frame color is
 929   // more important.
 930   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_HEADER,
 931                        &frame_color);
 932   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION,
 933                        &toolbar_color);
 934   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_TEXT,
 935                        &label_color);
 936
 937   // Override the link color if the theme provides it.
 938   const GdkColor* link_color = NULL;
 939   gtk_widget_style_get(GTK_WIDGET(fake_window_),
 940                        "link-color", &link_color, NULL);
 941
 942   bool is_default_link_color = false;
 943   if (!link_color) {
 944     link_color = &kDefaultLinkColor;
 945     is_default_link_color = true;
 946   }
 947
 948   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK,
 949                        link_color);
 950   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK_UNDERLINE,
 951                        link_color);
 952   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK,
 953                        link_color);
 954   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK_UNDERLINE,
 955                        link_color);
 956
 957   if (!is_default_link_color)
 958     gdk_color_free(const_cast<GdkColor*>(link_color));
 959
 960   // Generate the colors that we pass to WebKit.
 961   focus_ring_color_ = GdkColorToSkColor(frame_color);
 962
 963   GdkColor thumb_active_color, thumb_inactive_color, track_color;
 964   Gtk2UI::GetScrollbarColors(&thumb_active_color,
 965                              &thumb_inactive_color,
 966                              &track_color);
 967   thumb_active_color_ = GdkColorToSkColor(thumb_active_color);
 968   thumb_inactive_color_ = GdkColorToSkColor(thumb_inactive_color);
 969   track_color_ = GdkColorToSkColor(track_color);
 970
 971   // Some GTK themes only define the text selection colors on the GtkEntry
 972   // class, so we need to use that for getting selection colors.
 973   active_selection_bg_color_ =
 974       GdkColorToSkColor(entry_style->base[GTK_STATE_SELECTED]);
 975   active_selection_fg_color_ =
 976       GdkColorToSkColor(entry_style->text[GTK_STATE_SELECTED]);
 977   inactive_selection_bg_color_ =
 978       GdkColorToSkColor(entry_style->base[GTK_STATE_ACTIVE]);
 979   inactive_selection_fg_color_ =
 980       GdkColorToSkColor(entry_style->text[GTK_STATE_ACTIVE]);
 981 }
 982
 983 GdkColor Gtk2UI::BuildFrameColors(GtkStyle* frame_style) {
 984   GdkColor* theme_frame = NULL;
 985   GdkColor* theme_inactive_frame = NULL;
 986   GdkColor* theme_incognito_frame = NULL;
 987   GdkColor* theme_incognito_inactive_frame = NULL;
 988   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
 989                        "frame-color", &theme_frame,
 990                        "inactive-frame-color", &theme_inactive_frame,
 991                        "incognito-frame-color", &theme_incognito_frame,
 992                        "incognito-inactive-frame-color",
 993                        &theme_incognito_inactive_frame,
 994                        NULL);
 995
 996   GdkColor frame_color = BuildAndSetFrameColor(
 997       &frame_style->bg[GTK_STATE_SELECTED],
 998       theme_frame,
 999       kDefaultFrameShift,
1000       ThemeProperties::COLOR_FRAME,
1001       ThemeProperties::TINT_FRAME);
1002   if (theme_frame)
1003     gdk_color_free(theme_frame);
1004   SetThemeTintFromGtk(ThemeProperties::TINT_BACKGROUND_TAB, &frame_color);
1005
1006   BuildAndSetFrameColor(
1007       &frame_style->bg[GTK_STATE_INSENSITIVE],
1008       theme_inactive_frame,
1009       kDefaultFrameShift,
1010       ThemeProperties::COLOR_FRAME_INACTIVE,
1011       ThemeProperties::TINT_FRAME_INACTIVE);
1012   if (theme_inactive_frame)
1013     gdk_color_free(theme_inactive_frame);
1014
1015   BuildAndSetFrameColor(
1016       &frame_color,
1017       theme_incognito_frame,
1018       GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO),
1019       ThemeProperties::COLOR_FRAME_INCOGNITO,
1020       ThemeProperties::TINT_FRAME_INCOGNITO);
1021   if (theme_incognito_frame)
1022     gdk_color_free(theme_incognito_frame);
1023
1024   BuildAndSetFrameColor(
1025       &frame_color,
1026       theme_incognito_inactive_frame,
1027       GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE),
1028       ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
1029       ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE);
1030   if (theme_incognito_inactive_frame)
1031     gdk_color_free(theme_incognito_inactive_frame);
1032
1033   return frame_color;
1034 }
1035
1036 void Gtk2UI::SetThemeColorFromGtk(int id, const GdkColor* color) {
1037   colors_[id] = GdkColorToSkColor(*color);
1038 }
1039
1040 void Gtk2UI::SetThemeTintFromGtk(int id, const GdkColor* color) {
1041   color_utils::HSL default_tint = GetDefaultTint(id);
1042   color_utils::HSL hsl;
1043   color_utils::SkColorToHSL(GdkColorToSkColor(*color), &hsl);
1044
1045   if (default_tint.s != -1)
1046     hsl.s = default_tint.s;
1047
1048   if (default_tint.l != -1)
1049     hsl.l = default_tint.l;
1050
1051   tints_[id] = hsl;
1052 }
1053
1054 GdkColor Gtk2UI::BuildAndSetFrameColor(const GdkColor* base,
1055                                        const GdkColor* gtk_base,
1056                                        const color_utils::HSL& tint,
1057                                        int color_id,
1058                                        int tint_id) {
1059   GdkColor out_color = *base;
1060   if (gtk_base) {
1061     // The theme author specified a color to use, use it without modification.
1062     out_color = *gtk_base;
1063   } else {
1064     // Tint the basic color since this is a heuristic color instead of one
1065     // specified by the theme author.
1066     GdkColorHSLShift(tint, &out_color);
1067   }
1068   SetThemeColorFromGtk(color_id, &out_color);
1069   SetThemeTintFromGtk(tint_id, &out_color);
1070
1071   return out_color;
1072 }
1073
1074 SkBitmap Gtk2UI::GenerateGtkThemeBitmap(int id) const {
1075   switch (id) {
1076     case IDR_THEME_TOOLBAR: {
1077       GtkStyle* style = gtk_rc_get_style(fake_window_);
1078       GdkColor* color = &style->bg[GTK_STATE_NORMAL];
1079       SkBitmap bitmap;
1080       bitmap.allocN32Pixels(kToolbarImageWidth, kToolbarImageHeight);
1081       bitmap.eraseARGB(0xff, color->red >> 8, color->green >> 8,
1082                        color->blue >> 8);
1083       return bitmap;
1084     }
1085     case IDR_THEME_TAB_BACKGROUND:
1086     case IDR_THEME_TAB_BACKGROUND_DESKTOP:
1087       return GenerateTabImage(IDR_THEME_FRAME);
1088     case IDR_THEME_TAB_BACKGROUND_INCOGNITO:
1089     case IDR_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP:
1090       return GenerateTabImage(IDR_THEME_FRAME_INCOGNITO);
1091     case IDR_FRAME:
1092     case IDR_THEME_FRAME:
1093       return GenerateFrameImage(ThemeProperties::COLOR_FRAME,
1094                                 "frame-gradient-color");
1095     case IDR_FRAME_INACTIVE:
1096     case IDR_THEME_FRAME_INACTIVE:
1097       return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INACTIVE,
1098                                 "inactive-frame-gradient-color");
1099     case IDR_THEME_FRAME_INCOGNITO:
1100       return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INCOGNITO,
1101                                 "incognito-frame-gradient-color");
1102     case IDR_THEME_FRAME_INCOGNITO_INACTIVE: {
1103       return GenerateFrameImage(
1104           ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
1105           "incognito-inactive-frame-gradient-color");
1106     }
1107     // Icons that sit inside the omnibox shouldn't receive TINT_BUTTONS and
1108     // instead should tint based on the foreground text entry color in GTK+
1109     // mode because some themes that try to be dark *and* light have very
1110     // different colors between the omnibox and the normal background area.
1111     // TODO(erg): Decide what to do about other icons that appear in the
1112     // omnibox, e.g. content settings icons.
1113     case IDR_OMNIBOX_CALCULATOR:
1114     case IDR_OMNIBOX_EXTENSION_APP:
1115     case IDR_OMNIBOX_HTTP:
1116     case IDR_OMNIBOX_SEARCH:
1117     case IDR_OMNIBOX_STAR:
1118     case IDR_OMNIBOX_TTS: {
1119       return GenerateTintedIcon(id, entry_tint_);
1120     }
1121     // In GTK mode, the dark versions of the omnibox icons only ever appear in
1122     // the autocomplete popup and only against the current theme's GtkEntry
1123     // base[GTK_STATE_SELECTED] color, so tint the icons so they won't collide
1124     // with the selected color.
1125     case IDR_OMNIBOX_EXTENSION_APP_DARK:
1126     case IDR_OMNIBOX_HTTP_DARK:
1127     case IDR_OMNIBOX_SEARCH_DARK:
1128     case IDR_OMNIBOX_STAR_DARK:
1129     case IDR_OMNIBOX_TTS_DARK: {
1130       return GenerateTintedIcon(id, selected_entry_tint_);
1131     }
1132     // In GTK mode, we need to manually render several icons.
1133     case IDR_BACK:
1134     case IDR_BACK_D:
1135     case IDR_FORWARD:
1136     case IDR_FORWARD_D:
1137     case IDR_HOME:
1138     case IDR_RELOAD:
1139     case IDR_RELOAD_D:
1140     case IDR_STOP:
1141     case IDR_STOP_D: {
1142       return GenerateGTKIcon(id);
1143     }
1144     case IDR_TOOLBAR_BEZEL_HOVER:
1145       return GenerateToolbarBezel(GTK_STATE_PRELIGHT, IDR_TOOLBAR_BEZEL_HOVER);
1146     case IDR_TOOLBAR_BEZEL_PRESSED:
1147       return GenerateToolbarBezel(GTK_STATE_ACTIVE, IDR_TOOLBAR_BEZEL_PRESSED);
1148     default: {
1149       return GenerateTintedIcon(id, button_tint_);
1150     }
1151   }
1152
1153   return SkBitmap();
1154 }
1155
1156 SkBitmap Gtk2UI::GenerateFrameImage(
1157     int color_id,
1158     const char* gradient_name) const {
1159   // We use two colors: the main color (passed in) and a lightened version of
1160   // that color (which is supposed to match the light gradient at the top of
1161   // several GTK+ themes, such as Ambiance, Clearlooks or Bluebird).
1162   ColorMap::const_iterator it = colors_.find(color_id);
1163   DCHECK(it != colors_.end());
1164   SkColor base = it->second;
1165
1166   gfx::Canvas canvas(gfx::Size(kToolbarImageWidth, kToolbarImageHeight),
1167       1.0f, true);
1168
1169   int gradient_size;
1170   GdkColor* gradient_top_color = NULL;
1171   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
1172                        "frame-gradient-size", &gradient_size,
1173                        gradient_name, &gradient_top_color,
1174                        NULL);
1175   if (gradient_size) {
1176     SkColor lighter = gradient_top_color ?
1177         GdkColorToSkColor(*gradient_top_color) :
1178         color_utils::HSLShift(base, kGtkFrameShift);
1179     skia::RefPtr<SkShader> shader = gfx::CreateGradientShader(
1180         0, gradient_size, lighter, base);
1181     SkPaint paint;
1182     paint.setStyle(SkPaint::kFill_Style);
1183     paint.setAntiAlias(true);
1184     paint.setShader(shader.get());
1185
1186     canvas.DrawRect(gfx::Rect(0, 0, kToolbarImageWidth, gradient_size), paint);
1187   }
1188
1189   if (gradient_top_color)
1190     gdk_color_free(gradient_top_color);
1191
1192   canvas.FillRect(gfx::Rect(0, gradient_size, kToolbarImageWidth,
1193                             kToolbarImageHeight - gradient_size), base);
1194   return canvas.ExtractImageRep().sk_bitmap();
1195 }
1196
1197 SkBitmap Gtk2UI::GenerateTabImage(int base_id) const {
1198   const SkBitmap* base_image = GetThemeImageNamed(base_id).ToSkBitmap();
1199   SkBitmap bg_tint = SkBitmapOperations::CreateHSLShiftedBitmap(
1200       *base_image, GetDefaultTint(ThemeProperties::TINT_BACKGROUND_TAB));
1201   return SkBitmapOperations::CreateTiledBitmap(
1202       bg_tint, 0, 0, bg_tint.width(), bg_tint.height());
1203 }
1204
1205 SkBitmap Gtk2UI::GenerateTintedIcon(
1206     int base_id,
1207     const color_utils::HSL& tint) const {
1208   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1209   return SkBitmapOperations::CreateHSLShiftedBitmap(
1210       rb.GetImageNamed(base_id).AsBitmap(), tint);
1211 }
1212
1213 SkBitmap Gtk2UI::GenerateGTKIcon(int base_id) const {
1214   const char* stock_id = NULL;
1215   GtkStateType gtk_state = GTK_STATE_NORMAL;
1216   for (unsigned int i = 0; i < arraysize(kGtkIcons); ++i) {
1217     if (kGtkIcons[i].idr == base_id) {
1218       stock_id = kGtkIcons[i].stock_id;
1219       gtk_state = kGtkIcons[i].gtk_state;
1220       break;
1221     }
1222   }
1223   DCHECK(stock_id);
1224
1225   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1226   SkBitmap default_bitmap = rb.GetImageNamed(base_id).AsBitmap();
1227
1228   gtk_widget_ensure_style(fake_frame_);
1229   GtkStyle* style = gtk_widget_get_style(fake_frame_);
1230   GtkIconSet* icon_set = gtk_style_lookup_icon_set(style, stock_id);
1231   if (!icon_set)
1232     return default_bitmap;
1233
1234   // Ask GTK to render the icon to a buffer, which we will steal from.
1235   GdkPixbuf* gdk_icon = gtk_icon_set_render_icon(
1236       icon_set,
1237       style,
1238       base::i18n::IsRTL() ? GTK_TEXT_DIR_RTL : GTK_TEXT_DIR_LTR,
1239       gtk_state,
1240       GTK_ICON_SIZE_SMALL_TOOLBAR,
1241       fake_frame_,
1242       NULL);
1243
1244   if (!gdk_icon) {
1245     // This can theoretically happen if an icon theme doesn't provide a
1246     // specific image. This should realistically never happen, but I bet there
1247     // are some theme authors who don't reliably provide all icons.
1248     return default_bitmap;
1249   }
1250
1251   SkBitmap retval;
1252   retval.allocN32Pixels(default_bitmap.width(), default_bitmap.height());
1253   retval.eraseColor(0);
1254
1255   const SkBitmap icon = GdkPixbufToImageSkia(gdk_icon);
1256   g_object_unref(gdk_icon);
1257
1258   SkCanvas canvas(retval);
1259
1260   if (gtk_state == GTK_STATE_ACTIVE || gtk_state == GTK_STATE_PRELIGHT) {
1261     SkBitmap border = DrawGtkButtonBorder(gtk_state,
1262                                           false,
1263                                           false,
1264                                           default_bitmap.width(),
1265                                           default_bitmap.height());
1266     canvas.drawBitmap(border, 0, 0);
1267   }
1268
1269   canvas.drawBitmap(icon,
1270                     (default_bitmap.width() / 2) - (icon.width() / 2),
1271                     (default_bitmap.height() / 2) - (icon.height() / 2));
1272
1273   return retval;
1274 }
1275
1276 SkBitmap Gtk2UI::GenerateToolbarBezel(int gtk_state, int sizing_idr) const {
1277   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1278   SkBitmap default_bitmap =
1279       rb.GetImageNamed(sizing_idr).AsBitmap();
1280
1281   SkBitmap retval;
1282   retval.allocN32Pixels(default_bitmap.width(), default_bitmap.height());
1283   retval.eraseColor(0);
1284
1285   SkCanvas canvas(retval);
1286   SkBitmap border = DrawGtkButtonBorder(
1287       gtk_state,
1288       false,
1289       false,
1290       default_bitmap.width(),
1291       default_bitmap.height());
1292   canvas.drawBitmap(border, 0, 0);
1293
1294   return retval;
1295 }
1296
1297 void Gtk2UI::GetNormalButtonTintHSL(color_utils::HSL* tint) const {
1298   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
1299   const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];
1300   const GdkColor base_color = window_style->base[GTK_STATE_NORMAL];
1301
1302   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
1303   const GdkColor text_color = label_style->fg[GTK_STATE_NORMAL];
1304
1305   PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
1306 }
1307
1308 void Gtk2UI::GetNormalEntryForegroundHSL(color_utils::HSL* tint) const {
1309   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
1310   const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];
1311
1312   GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
1313   const GdkColor text_color = style->text[GTK_STATE_NORMAL];
1314   const GdkColor base_color = style->base[GTK_STATE_NORMAL];
1315
1316   PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
1317 }
1318
1319 void Gtk2UI::GetSelectedEntryForegroundHSL(color_utils::HSL* tint) const {
1320   // The simplest of all the tints. We just use the selected text in the entry
1321   // since the icons tinted this way will only be displayed against
1322   // base[GTK_STATE_SELECTED].
1323   GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
1324   const GdkColor color = style->text[GTK_STATE_SELECTED];
1325   color_utils::SkColorToHSL(GdkColorToSkColor(color), tint);
1326 }
1327
1328 SkBitmap Gtk2UI::DrawGtkButtonBorder(int gtk_state,
1329                                      bool focused,
1330                                      bool call_to_action,
1331                                      int width,
1332                                      int height) const {
1333   // Create a temporary GTK button to snapshot
1334   GtkWidget* window = gtk_offscreen_window_new();
1335   GtkWidget* button = gtk_button_new();
1336   gtk_widget_set_size_request(button, width, height);
1337   gtk_container_add(GTK_CONTAINER(window), button);
1338   gtk_widget_realize(window);
1339   gtk_widget_realize(button);
1340   gtk_widget_show(button);
1341   gtk_widget_show(window);
1342
1343   if (call_to_action)
1344     GTK_WIDGET_SET_FLAGS(button, GTK_HAS_DEFAULT);
1345
1346   if (focused) {
1347     // We can't just use gtk_widget_grab_focus() here because that sets
1348     // gtk_widget_is_focus(), but not gtk_widget_has_focus(), which is what the
1349     // GtkButton's paint checks.
1350     GTK_WIDGET_SET_FLAGS(button, GTK_HAS_FOCUS);
1351   }
1352
1353   gtk_widget_set_state(button, static_cast<GtkStateType>(gtk_state));
1354
1355   GdkPixmap* pixmap;
1356   {
1357     // http://crbug.com/346740
1358     ANNOTATE_SCOPED_MEMORY_LEAK;
1359     pixmap = gtk_widget_get_snapshot(button, NULL);
1360   }
1361   int w, h;
1362   gdk_drawable_get_size(GDK_DRAWABLE(pixmap), &w, &h);
1363   DCHECK_EQ(w, width);
1364   DCHECK_EQ(h, height);
1365
1366   // We render the Pixmap to a Pixbuf. This can be slow, as we're scrapping
1367   // bits from X.
1368   GdkColormap* colormap = gdk_drawable_get_colormap(pixmap);
1369   GdkPixbuf* pixbuf = gdk_pixbuf_get_from_drawable(NULL,
1370                                                    GDK_DRAWABLE(pixmap),
1371                                                    colormap,
1372                                                    0, 0, 0, 0, w, h);
1373
1374   // Finally, we convert our pixbuf into a type we can use.
1375   SkBitmap border = GdkPixbufToImageSkia(pixbuf);
1376   g_object_unref(pixbuf);
1377   g_object_unref(pixmap);
1378   gtk_widget_destroy(window);
1379
1380   return border;
1381 }
1382
1383 void Gtk2UI::ClearAllThemeData() {
1384   gtk_images_.clear();
1385 }
1386
1387 void Gtk2UI::UpdateDefaultFont(const PangoFontDescription* desc) {
1388   // Use gfx::FontRenderParams to select a family and determine the rendering
1389   // settings.
1390   gfx::FontRenderParamsQuery query;
1391   base::SplitString(pango_font_description_get_family(desc), ',',
1392                     &query.families);
1393
1394   if (pango_font_description_get_size_is_absolute(desc)) {
1395     // If the size is absolute, it's specified in Pango units. There are
1396     // PANGO_SCALE Pango units in a device unit (pixel).
1397     const int size_pixels = pango_font_description_get_size(desc) / PANGO_SCALE;
1398     default_font_size_pixels_ = size_pixels;
1399     query.pixel_size = size_pixels;
1400   } else {
1401     // Non-absolute sizes are in points (again scaled by PANGO_SIZE).
1402     // Round the value when converting to pixels to match GTK's logic.
1403     const double size_points = pango_font_description_get_size(desc) /
1404         static_cast<double>(PANGO_SCALE);
1405     default_font_size_pixels_ = static_cast<int>(
1406         GetPixelsInPoint(device_scale_factor_) * size_points + 0.5);
1407     query.point_size = static_cast<int>(size_points);
1408   }
1409
1410   query.style = gfx::Font::NORMAL;
1411   // TODO(davemoore): Support weights other than bold?
1412   if (pango_font_description_get_weight(desc) == PANGO_WEIGHT_BOLD)
1413     query.style |= gfx::Font::BOLD;
1414   // TODO(davemoore): What about PANGO_STYLE_OBLIQUE?
1415   if (pango_font_description_get_style(desc) == PANGO_STYLE_ITALIC)
1416     query.style |= gfx::Font::ITALIC;
1417
1418   default_font_render_params_ =
1419       gfx::GetFontRenderParams(query, &default_font_family_);
1420   default_font_style_ = query.style;
1421 }
1422
1423 void Gtk2UI::OnStyleSet(GtkWidget* widget, GtkStyle* previous_style) {
1424   ClearAllThemeData();
1425   LoadGtkValues();
1426   NativeThemeGtk2::instance()->NotifyObservers();
1427 }
1428
1429 void Gtk2UI::UpdateDeviceScaleFactor(float device_scale_factor) {
1430   device_scale_factor_ = device_scale_factor;
1431   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
1432   UpdateDefaultFont(label_style->font_desc);
1433 }
1434
1435 float Gtk2UI::GetDeviceScaleFactor() const {
1436   float scale = GetFontDPI() / GetBaseDPI();
1437   // Round to 1 decimal, e.g. to 1.4.
1438   return roundf(scale * 10) / 10;
1439 }
1440
1441 }  // namespace libgtk2ui
1442
1443 views::LinuxUI* BuildGtk2UI() {
1444   return new libgtk2ui::Gtk2UI;
1445 }