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 <set>
   8
   9 #include <pango/pango.h>
  10
  11 #include "base/command_line.h"
  12 #include "base/debug/leak_annotations.h"
  13 #include "base/environment.h"
  14 #include "base/i18n/rtl.h"
  15 #include "base/logging.h"
  16 #include "base/nix/mime_util_xdg.h"
  17 #include "base/nix/xdg_util.h"
  18 #include "base/stl_util.h"
  19 #include "base/strings/string_split.h"
  20 #include "base/strings/stringprintf.h"
  21 #include "chrome/browser/themes/theme_properties.h"
  22 #include "chrome/browser/ui/libgtk2ui/app_indicator_icon.h"
  23 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
  24 #include "chrome/browser/ui/libgtk2ui/gtk2_border.h"
  25 #include "chrome/browser/ui/libgtk2ui/gtk2_event_loop.h"
  26 #include "chrome/browser/ui/libgtk2ui/gtk2_key_bindings_handler.h"
  27 #include "chrome/browser/ui/libgtk2ui/gtk2_signal_registrar.h"
  28 #include "chrome/browser/ui/libgtk2ui/gtk2_status_icon.h"
  29 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
  30 #include "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
  31 #include "chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h"
  32 #include "chrome/browser/ui/libgtk2ui/printing_gtk2_util.h"
  33 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
  34 #include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
  35 #include "chrome/browser/ui/libgtk2ui/unity_service.h"
  36 #include "chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h"
  37 #include "grit/components_scaled_resources.h"
  38 #include "grit/theme_resources.h"
  39 #include "printing/printing_context_linux.h"
  40 #include "third_party/skia/include/core/SkBitmap.h"
  41 #include "third_party/skia/include/core/SkCanvas.h"
  42 #include "third_party/skia/include/core/SkColor.h"
  43 #include "third_party/skia/include/core/SkShader.h"
  44 #include "ui/base/resource/resource_bundle.h"
  45 #include "ui/gfx/canvas.h"
  46 #include "ui/gfx/geometry/rect.h"
  47 #include "ui/gfx/geometry/size.h"
  48 #include "ui/gfx/image/image.h"
  49 #include "ui/gfx/skbitmap_operations.h"
  50 #include "ui/gfx/skia_util.h"
  51 #include "ui/resources/grit/ui_resources.h"
  52 #include "ui/views/controls/button/label_button.h"
  53 #include "ui/views/controls/button/label_button_border.h"
  54 #include "ui/views/linux_ui/window_button_order_observer.h"
  55
  56 #if defined(USE_GCONF)
  57 #include "chrome/browser/ui/libgtk2ui/gconf_listener.h"
  58 #endif
  59
  60 // A minimized port of GtkThemeService into something that can provide colors
  61 // and images for aura.
  62 //
  63 // TODO(erg): There's still a lot that needs ported or done for the first time:
  64 //
  65 // - Render and inject the omnibox background.
  66 // - Make sure to test with a light on dark theme, too.
  67
  68 // Work around a header bug:
  69 // linux/debian_wheezy_i386-sysroot/usr/include/linux/stddef.h redefines NULL
  70 // to 0, which breaks -Wsentinel. Get back the normal definition of NULL.
  71 // TODO(thakis): Remove this once we update sysroots.
  72 #define __need_NULL
  73 #include <stddef.h>
  74
  75 namespace libgtk2ui {
  76
  77 namespace {
  78
  79 struct GObjectDeleter {
  80   void operator()(void* ptr) {
  81     g_object_unref(ptr);
  82   }
  83 };
  84 struct GtkIconInfoDeleter {
  85   void operator()(GtkIconInfo* ptr) {
  86     gtk_icon_info_free(ptr);
  87   }
  88 };
  89 typedef scoped_ptr<GIcon, GObjectDeleter> ScopedGIcon;
  90 typedef scoped_ptr<GtkIconInfo, GtkIconInfoDeleter> ScopedGtkIconInfo;
  91 typedef scoped_ptr<GdkPixbuf, GObjectDeleter> ScopedGdkPixbuf;
  92
  93 // Prefix for app indicator ids
  94 const char kAppIndicatorIdPrefix[] = "chrome_app_indicator_";
  95
  96 // Number of app indicators used (used as part of app-indicator id).
  97 int indicators_count;
  98
  99 // The unknown content type.
 100 const char* kUnknownContentType = "application/octet-stream";
 101
 102 // The size of the rendered toolbar image.
 103 const int kToolbarImageWidth = 64;
 104 const int kToolbarImageHeight = 128;
 105
 106 // How much to tint the GTK+ color lighter at the top of the window.
 107 const color_utils::HSL kGtkFrameShift = { -1, -1, 0.58 };
 108
 109 // How much to tint the GTK+ color when an explicit frame color hasn't been
 110 // specified.
 111 const color_utils::HSL kDefaultFrameShift = { -1, -1, 0.4 };
 112
 113 // Values used as the new luminance and saturation values in the inactive tab
 114 // text color.
 115 const double kDarkInactiveLuminance = 0.85;
 116 const double kLightInactiveLuminance = 0.15;
 117 const double kHeavyInactiveSaturation = 0.7;
 118 const double kLightInactiveSaturation = 0.3;
 119
 120 // Default color for links on the NTP when the GTK+ theme doesn't define a
 121 // link color. Constant taken from gtklinkbutton.c.
 122 const GdkColor kDefaultLinkColor = { 0, 0, 0, 0xeeee };
 123
 124 const int kSkiaToGDKMultiplier = 257;
 125
 126 // TODO(erg): ThemeService has a whole interface just for reading default
 127 // constants. Figure out what to do with that more long term; for now, just
 128 // copy the constants themselves here.
 129 //
 130 // Default tints.
 131 const color_utils::HSL kDefaultTintButtons = { -1, -1, -1 };
 132 const color_utils::HSL kDefaultTintFrame = { -1, -1, -1 };
 133 const color_utils::HSL kDefaultTintFrameInactive = { -1, -1, 0.75f };
 134 const color_utils::HSL kDefaultTintFrameIncognito = { -1, 0.2f, 0.35f };
 135 const color_utils::HSL kDefaultTintFrameIncognitoInactive = { -1, 0.3f, 0.6f };
 136 const color_utils::HSL kDefaultTintBackgroundTab = { -1, 0.5, 0.75 };
 137
 138 // A list of images that we provide while in gtk mode.
 139 //
 140 // TODO(erg): We list both the normal and *_DESKTOP versions of some of these
 141 // images because in some contexts, we don't go through the
 142 // chrome::MapThemeImage interface. That should be fixed, but tracking that
 143 // down is Hard.
 144 const int kThemeImages[] = {
 145   IDR_THEME_TOOLBAR,
 146   IDR_THEME_TAB_BACKGROUND,
 147   IDR_THEME_TAB_BACKGROUND_DESKTOP,
 148   IDR_THEME_TAB_BACKGROUND_INCOGNITO,
 149   IDR_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP,
 150   IDR_FRAME,
 151   IDR_FRAME_INACTIVE,
 152   IDR_THEME_FRAME,
 153   IDR_THEME_FRAME_INACTIVE,
 154   IDR_THEME_FRAME_INCOGNITO,
 155   IDR_THEME_FRAME_INCOGNITO_INACTIVE,
 156 };
 157
 158 // A list of icons used in the autocomplete view that should be tinted to the
 159 // current gtk theme selection color so they stand out against the GtkEntry's
 160 // base color.
 161 // TODO(erg): Decide what to do about other icons that appear in the omnibox,
 162 // e.g. content settings icons.
 163 const int kAutocompleteImages[] = {
 164   IDR_OMNIBOX_CALCULATOR,
 165   IDR_OMNIBOX_EXTENSION_APP,
 166   IDR_OMNIBOX_HTTP,
 167   IDR_OMNIBOX_HTTP_DARK,
 168   IDR_OMNIBOX_SEARCH,
 169   IDR_OMNIBOX_SEARCH_DARK,
 170   IDR_OMNIBOX_STAR,
 171   IDR_OMNIBOX_STAR_DARK,
 172   IDR_OMNIBOX_TTS,
 173   IDR_OMNIBOX_TTS_DARK,
 174 };
 175
 176 // This table converts button ids into a pair of gtk-stock id and state.
 177 struct IDRGtkMapping {
 178   int idr;
 179   const char* stock_id;
 180   GtkStateType gtk_state;
 181 } const kGtkIcons[] = {
 182   { IDR_BACK,      GTK_STOCK_GO_BACK,    GTK_STATE_NORMAL },
 183   { IDR_BACK_D,    GTK_STOCK_GO_BACK,    GTK_STATE_INSENSITIVE },
 184
 185   { IDR_FORWARD,   GTK_STOCK_GO_FORWARD, GTK_STATE_NORMAL },
 186   { IDR_FORWARD_D, GTK_STOCK_GO_FORWARD, GTK_STATE_INSENSITIVE },
 187
 188   { IDR_HOME,      GTK_STOCK_HOME,       GTK_STATE_NORMAL },
 189
 190   { IDR_RELOAD,    GTK_STOCK_REFRESH,    GTK_STATE_NORMAL },
 191   { IDR_RELOAD_D,  GTK_STOCK_REFRESH,    GTK_STATE_INSENSITIVE },
 192
 193   { IDR_STOP,      GTK_STOCK_STOP,       GTK_STATE_NORMAL },
 194   { IDR_STOP_D,    GTK_STOCK_STOP,       GTK_STATE_INSENSITIVE },
 195 };
 196
 197 // The image resources that will be tinted by the 'button' tint value.
 198 const int kOtherToolbarButtonIDs[] = {
 199   IDR_TOOLBAR_BEZEL_HOVER,
 200   IDR_TOOLBAR_BEZEL_PRESSED,
 201   IDR_BROWSER_ACTIONS_OVERFLOW,
 202   IDR_THROBBER,
 203   IDR_THROBBER_WAITING,
 204   IDR_THROBBER_LIGHT,
 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 // Queries GTK for its font DPI setting and returns the number of pixels in a
 384 // point.
 385 double GetPixelsInPoint(float device_scale_factor) {
 386   GtkSettings* gtk_settings = gtk_settings_get_default();
 387   CHECK(gtk_settings);
 388   gint gtk_dpi = -1;
 389   g_object_get(gtk_settings, "gtk-xft-dpi", &gtk_dpi, NULL);
 390
 391   // GTK multiplies the DPI by 1024 before storing it.
 392   double dpi = (gtk_dpi > 0) ? gtk_dpi / 1024.0 : 96.0;
 393
 394   // Take device_scale_factor into account — if Chrome already scales the
 395   // entire UI up by 2x, we should not also scale up.
 396   dpi /= device_scale_factor;
 397
 398   // There are 72 points in an inch.
 399   return dpi / 72.0;
 400 }
 401
 402 views::LinuxUI::NonClientMiddleClickAction GetDefaultMiddleClickAction() {
 403   scoped_ptr<base::Environment> env(base::Environment::Create());
 404   switch (base::nix::GetDesktopEnvironment(env.get())) {
 405     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
 406       // Starting with KDE 4.4, windows' titlebars can be dragged with the
 407       // middle mouse button to create tab groups. We don't support that in
 408       // Chrome, but at least avoid lowering windows in response to middle
 409       // clicks to avoid surprising users who expect the KDE behavior.
 410       return views::LinuxUI::MIDDLE_CLICK_ACTION_NONE;
 411     default:
 412       return views::LinuxUI::MIDDLE_CLICK_ACTION_LOWER;
 413   }
 414 }
 415
 416 }  // namespace
 417
 418 Gtk2UI::Gtk2UI()
 419     : default_font_size_pixels_(0),
 420       default_font_style_(gfx::Font::NORMAL),
 421       middle_click_action_(GetDefaultMiddleClickAction()),
 422       device_scale_factor_(1.0) {
 423   GtkInitFromCommandLine(*base::CommandLine::ForCurrentProcess());
 424 }
 425
 426 void Gtk2UI::Initialize() {
 427   signals_.reset(new Gtk2SignalRegistrar);
 428
 429   // Create our fake widgets.
 430   fake_window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 431   fake_frame_ = chrome_gtk_frame_new();
 432   fake_label_.Own(gtk_label_new(""));
 433   fake_entry_.Own(gtk_entry_new());
 434
 435   // Only realized widgets receive style-set notifications, which we need to
 436   // broadcast new theme images and colors. Only realized widgets have style
 437   // properties, too, which we query for some colors.
 438   gtk_widget_realize(fake_frame_);
 439   gtk_widget_realize(fake_window_);
 440
 441   signals_->Connect(fake_frame_, "style-set",
 442                     G_CALLBACK(&OnStyleSetThunk), this);
 443
 444   LoadGtkValues();
 445
 446   printing::PrintingContextLinux::SetCreatePrintDialogFunction(
 447       &PrintDialogGtk2::CreatePrintDialog);
 448   printing::PrintingContextLinux::SetPdfPaperSizeFunction(
 449       &GetPdfPaperSizeDeviceUnitsGtk);
 450
 451 #if defined(USE_GCONF)
 452   // We must build this after GTK gets initialized.
 453   gconf_listener_.reset(new GConfListener(this));
 454 #endif  // defined(USE_GCONF)
 455
 456   indicators_count = 0;
 457
 458   // Instantiate the singleton instance of Gtk2EventLoop.
 459   Gtk2EventLoop::GetInstance();
 460 }
 461
 462 Gtk2UI::~Gtk2UI() {
 463   gtk_widget_destroy(fake_window_);
 464   gtk_widget_destroy(fake_frame_);
 465   fake_label_.Destroy();
 466   fake_entry_.Destroy();
 467
 468   ClearAllThemeData();
 469 }
 470
 471 gfx::Image Gtk2UI::GetThemeImageNamed(int id) const {
 472   // Try to get our cached version:
 473   ImageCache::const_iterator it = gtk_images_.find(id);
 474   if (it != gtk_images_.end())
 475     return it->second;
 476
 477   if (IsOverridableImage(id)) {
 478     gfx::Image image = gfx::Image(
 479         gfx::ImageSkia::CreateFrom1xBitmap(GenerateGtkThemeBitmap(id)));
 480     gtk_images_[id] = image;
 481     return image;
 482   }
 483
 484   return gfx::Image();
 485 }
 486
 487 bool Gtk2UI::GetColor(int id, SkColor* color) const {
 488   ColorMap::const_iterator it = colors_.find(id);
 489   if (it != colors_.end()) {
 490     *color = it->second;
 491     return true;
 492   }
 493
 494   return false;
 495 }
 496
 497 bool Gtk2UI::HasCustomImage(int id) const {
 498   return IsOverridableImage(id);
 499 }
 500
 501 SkColor Gtk2UI::GetFocusRingColor() const {
 502   return focus_ring_color_;
 503 }
 504
 505 SkColor Gtk2UI::GetThumbActiveColor() const {
 506   return thumb_active_color_;
 507 }
 508
 509 SkColor Gtk2UI::GetThumbInactiveColor() const {
 510   return thumb_inactive_color_;
 511 }
 512
 513 SkColor Gtk2UI::GetTrackColor() const {
 514   return track_color_;
 515 }
 516
 517 SkColor Gtk2UI::GetActiveSelectionBgColor() const {
 518   return active_selection_bg_color_;
 519 }
 520
 521 SkColor Gtk2UI::GetActiveSelectionFgColor() const {
 522   return active_selection_fg_color_;
 523 }
 524
 525 SkColor Gtk2UI::GetInactiveSelectionBgColor() const {
 526   return inactive_selection_bg_color_;
 527 }
 528
 529 SkColor Gtk2UI::GetInactiveSelectionFgColor() const {
 530   return inactive_selection_fg_color_;
 531 }
 532
 533 double Gtk2UI::GetCursorBlinkInterval() const {
 534   // From http://library.gnome.org/devel/gtk/unstable/GtkSettings.html, this is
 535   // the default value for gtk-cursor-blink-time.
 536   static const gint kGtkDefaultCursorBlinkTime = 1200;
 537
 538   // Dividing GTK's cursor blink cycle time (in milliseconds) by this value
 539   // yields an appropriate value for
 540   // content::RendererPreferences::caret_blink_interval.  This matches the
 541   // logic in the WebKit GTK port.
 542   static const double kGtkCursorBlinkCycleFactor = 2000.0;
 543
 544   gint cursor_blink_time = kGtkDefaultCursorBlinkTime;
 545   gboolean cursor_blink = TRUE;
 546   g_object_get(gtk_settings_get_default(),
 547                "gtk-cursor-blink-time", &cursor_blink_time,
 548                "gtk-cursor-blink", &cursor_blink,
 549                NULL);
 550   return cursor_blink ? (cursor_blink_time / kGtkCursorBlinkCycleFactor) : 0.0;
 551 }
 552
 553 ui::NativeTheme* Gtk2UI::GetNativeTheme(aura::Window* window) const {
 554   ui::NativeTheme* native_theme_override = NULL;
 555   if (!native_theme_overrider_.is_null())
 556     native_theme_override = native_theme_overrider_.Run(window);
 557
 558   if (native_theme_override)
 559     return native_theme_override;
 560
 561   return NativeThemeGtk2::instance();
 562 }
 563
 564 void Gtk2UI::SetNativeThemeOverride(const NativeThemeGetter& callback) {
 565   native_theme_overrider_ = callback;
 566 }
 567
 568 bool Gtk2UI::GetDefaultUsesSystemTheme() const {
 569   scoped_ptr<base::Environment> env(base::Environment::Create());
 570
 571   switch (base::nix::GetDesktopEnvironment(env.get())) {
 572     case base::nix::DESKTOP_ENVIRONMENT_GNOME:
 573     case base::nix::DESKTOP_ENVIRONMENT_UNITY:
 574     case base::nix::DESKTOP_ENVIRONMENT_XFCE:
 575       return true;
 576     case base::nix::DESKTOP_ENVIRONMENT_KDE3:
 577     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
 578     case base::nix::DESKTOP_ENVIRONMENT_OTHER:
 579       return false;
 580   }
 581   // Unless GetDesktopEnvironment() badly misbehaves, this should never happen.
 582   NOTREACHED();
 583   return false;
 584 }
 585
 586 void Gtk2UI::SetDownloadCount(int count) const {
 587   if (unity::IsRunning())
 588     unity::SetDownloadCount(count);
 589 }
 590
 591 void Gtk2UI::SetProgressFraction(float percentage) const {
 592   if (unity::IsRunning())
 593     unity::SetProgressFraction(percentage);
 594 }
 595
 596 bool Gtk2UI::IsStatusIconSupported() const {
 597   return true;
 598 }
 599
 600 scoped_ptr<views::StatusIconLinux> Gtk2UI::CreateLinuxStatusIcon(
 601     const gfx::ImageSkia& image,
 602     const base::string16& tool_tip) const {
 603   if (AppIndicatorIcon::CouldOpen()) {
 604     ++indicators_count;
 605     return scoped_ptr<views::StatusIconLinux>(new AppIndicatorIcon(
 606         base::StringPrintf("%s%d", kAppIndicatorIdPrefix, indicators_count),
 607         image,
 608         tool_tip));
 609   } else {
 610     return scoped_ptr<views::StatusIconLinux>(new Gtk2StatusIcon(
 611         image, tool_tip));
 612   }
 613 }
 614
 615 gfx::Image Gtk2UI::GetIconForContentType(
 616     const std::string& content_type,
 617     int size) const {
 618   // This call doesn't take a reference.
 619   GtkIconTheme* theme = gtk_icon_theme_get_default();
 620
 621   std::string content_types[] = {
 622     content_type, kUnknownContentType
 623   };
 624
 625   for (size_t i = 0; i < arraysize(content_types); ++i) {
 626     ScopedGIcon icon(g_content_type_get_icon(content_types[i].c_str()));
 627     ScopedGtkIconInfo icon_info(
 628         gtk_icon_theme_lookup_by_gicon(
 629             theme, icon.get(), size,
 630             static_cast<GtkIconLookupFlags>(GTK_ICON_LOOKUP_FORCE_SIZE)));
 631     if (!icon_info)
 632       continue;
 633     ScopedGdkPixbuf pixbuf(gtk_icon_info_load_icon(icon_info.get(), NULL));
 634     if (!pixbuf)
 635       continue;
 636
 637     SkBitmap bitmap = GdkPixbufToImageSkia(pixbuf.get());
 638     DCHECK_EQ(size, bitmap.width());
 639     DCHECK_EQ(size, bitmap.height());
 640     gfx::ImageSkia image_skia = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
 641     image_skia.MakeThreadSafe();
 642     return gfx::Image(image_skia);
 643   }
 644   return gfx::Image();
 645 }
 646
 647 scoped_ptr<views::Border> Gtk2UI::CreateNativeBorder(
 648     views::LabelButton* owning_button,
 649     scoped_ptr<views::LabelButtonBorder> border) {
 650   if (owning_button->GetNativeTheme() != NativeThemeGtk2::instance())
 651     return border.Pass();
 652
 653   return make_scoped_ptr(new Gtk2Border(this, owning_button, border.Pass()));
 654 }
 655
 656 void Gtk2UI::AddWindowButtonOrderObserver(
 657     views::WindowButtonOrderObserver* observer) {
 658   if (!leading_buttons_.empty() || !trailing_buttons_.empty()) {
 659     observer->OnWindowButtonOrderingChange(leading_buttons_,
 660                                            trailing_buttons_);
 661   }
 662
 663   observer_list_.AddObserver(observer);
 664 }
 665
 666 void Gtk2UI::RemoveWindowButtonOrderObserver(
 667     views::WindowButtonOrderObserver* observer) {
 668   observer_list_.RemoveObserver(observer);
 669 }
 670
 671 void Gtk2UI::SetWindowButtonOrdering(
 672     const std::vector<views::FrameButton>& leading_buttons,
 673     const std::vector<views::FrameButton>& trailing_buttons) {
 674   leading_buttons_ = leading_buttons;
 675   trailing_buttons_ = trailing_buttons;
 676
 677   FOR_EACH_OBSERVER(views::WindowButtonOrderObserver, observer_list_,
 678                     OnWindowButtonOrderingChange(leading_buttons_,
 679                                                  trailing_buttons_));
 680 }
 681
 682 void Gtk2UI::SetNonClientMiddleClickAction(NonClientMiddleClickAction action) {
 683   middle_click_action_ = action;
 684 }
 685
 686 scoped_ptr<ui::LinuxInputMethodContext> Gtk2UI::CreateInputMethodContext(
 687     ui::LinuxInputMethodContextDelegate* delegate) const {
 688   return scoped_ptr<ui::LinuxInputMethodContext>(
 689       new X11InputMethodContextImplGtk2(delegate));
 690 }
 691
 692 gfx::FontRenderParams Gtk2UI::GetDefaultFontRenderParams() const {
 693   static gfx::FontRenderParams params = GetGtkFontRenderParams();
 694   return params;
 695 }
 696
 697 void Gtk2UI::GetDefaultFontDescription(
 698     std::string* family_out,
 699     int* size_pixels_out,
 700     int* style_out,
 701     gfx::FontRenderParams* params_out) const {
 702   *family_out = default_font_family_;
 703   *size_pixels_out = default_font_size_pixels_;
 704   *style_out = default_font_style_;
 705   *params_out = default_font_render_params_;
 706 }
 707
 708 ui::SelectFileDialog* Gtk2UI::CreateSelectFileDialog(
 709     ui::SelectFileDialog::Listener* listener,
 710     ui::SelectFilePolicy* policy) const {
 711   return SelectFileDialogImpl::Create(listener, policy);
 712 }
 713
 714 bool Gtk2UI::UnityIsRunning() {
 715   return unity::IsRunning();
 716 }
 717
 718 views::LinuxUI::NonClientMiddleClickAction
 719 Gtk2UI::GetNonClientMiddleClickAction() {
 720   return middle_click_action_;
 721 }
 722
 723 void Gtk2UI::NotifyWindowManagerStartupComplete() {
 724   // TODO(port) Implement this using _NET_STARTUP_INFO_BEGIN/_NET_STARTUP_INFO
 725   // from http://standards.freedesktop.org/startup-notification-spec/ instead.
 726   gdk_notify_startup_complete();
 727 }
 728
 729 bool Gtk2UI::MatchEvent(const ui::Event& event,
 730                         std::vector<ui::TextEditCommandAuraLinux>* commands) {
 731   // Ensure that we have a keyboard handler.
 732   if (!key_bindings_handler_)
 733     key_bindings_handler_.reset(new Gtk2KeyBindingsHandler);
 734
 735   return key_bindings_handler_->MatchEvent(event, commands);
 736 }
 737
 738 void Gtk2UI::GetScrollbarColors(GdkColor* thumb_active_color,
 739                                 GdkColor* thumb_inactive_color,
 740                                 GdkColor* track_color) {
 741   GdkColor* theme_thumb_active = NULL;
 742   GdkColor* theme_thumb_inactive = NULL;
 743   GdkColor* theme_trough_color = NULL;
 744   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
 745                        "scrollbar-slider-prelight-color", &theme_thumb_active,
 746                        "scrollbar-slider-normal-color", &theme_thumb_inactive,
 747                        "scrollbar-trough-color", &theme_trough_color,
 748                        NULL);
 749
 750   // Ask the theme if the theme specifies all the scrollbar colors and short
 751   // circuit the expensive painting/compositing if we have all of them.
 752   if (theme_thumb_active && theme_thumb_inactive && theme_trough_color) {
 753     *thumb_active_color = *theme_thumb_active;
 754     *thumb_inactive_color = *theme_thumb_inactive;
 755     *track_color = *theme_trough_color;
 756
 757     gdk_color_free(theme_thumb_active);
 758     gdk_color_free(theme_thumb_inactive);
 759     gdk_color_free(theme_trough_color);
 760     return;
 761   }
 762
 763   // Create window containing scrollbar elements
 764   GtkWidget* window    = gtk_window_new(GTK_WINDOW_POPUP);
 765   GtkWidget* fixed     = gtk_fixed_new();
 766   GtkWidget* scrollbar = gtk_hscrollbar_new(NULL);
 767   gtk_container_add(GTK_CONTAINER(window), fixed);
 768   gtk_container_add(GTK_CONTAINER(fixed),  scrollbar);
 769   gtk_widget_realize(window);
 770   gtk_widget_realize(scrollbar);
 771
 772   // Draw scrollbar thumb part and track into offscreen image
 773   const int kWidth  = 100;
 774   const int kHeight = 20;
 775   GtkStyle* style   = gtk_rc_get_style(scrollbar);
 776   GdkWindow* gdk_window = gtk_widget_get_window(window);
 777   GdkPixmap* pm     = gdk_pixmap_new(gdk_window, kWidth, kHeight, -1);
 778   GdkRectangle rect = { 0, 0, kWidth, kHeight };
 779   unsigned char data[3 * kWidth * kHeight];
 780   for (int i = 0; i < 3; ++i) {
 781     if (i < 2) {
 782       // Thumb part
 783       gtk_paint_slider(style, pm,
 784                        i == 0 ? GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
 785                        GTK_SHADOW_OUT, &rect, scrollbar, "slider", 0, 0,
 786                        kWidth, kHeight, GTK_ORIENTATION_HORIZONTAL);
 787     } else {
 788       // Track
 789       gtk_paint_box(style, pm, GTK_STATE_ACTIVE, GTK_SHADOW_IN, &rect,
 790                     scrollbar, "trough-upper", 0, 0, kWidth, kHeight);
 791     }
 792     GdkPixbuf* pb = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB,
 793                                              FALSE, 8, kWidth, kHeight,
 794                                              3 * kWidth, 0, 0);
 795     gdk_pixbuf_get_from_drawable(pb, pm, NULL, 0, 0, 0, 0, kWidth, kHeight);
 796
 797     // Sample pixels
 798     int components[3] = { 0 };
 799     for (int y = 2; y < kHeight - 2; ++y) {
 800       for (int c = 0; c < 3; ++c) {
 801         // Sample a vertical slice of pixels at about one-thirds from the
 802         // left edge. This allows us to avoid any fixed graphics that might be
 803         // located at the edges or in the center of the scrollbar.
 804         // Each pixel is made up of a red, green, and blue component; taking up
 805         // a total of three bytes.
 806         components[c] += data[3 * (kWidth / 3 + y * kWidth) + c];
 807       }
 808     }
 809     GdkColor* color = i == 0 ? thumb_active_color :
 810                       i == 1 ? thumb_inactive_color :
 811                                track_color;
 812     color->pixel = 0;
 813     // We sampled pixels across the full height of the image, ignoring a two
 814     // pixel border. In some themes, the border has a completely different
 815     // color which we do not want to factor into our average color computation.
 816     //
 817     // We now need to scale the colors from the 0..255 range, to the wider
 818     // 0..65535 range, and we need to actually compute the average color; so,
 819     // we divide by the total number of pixels in the sample.
 820     color->red   = components[0] * 65535 / (255 * (kHeight - 4));
 821     color->green = components[1] * 65535 / (255 * (kHeight - 4));
 822     color->blue  = components[2] * 65535 / (255 * (kHeight - 4));
 823
 824     g_object_unref(pb);
 825   }
 826   g_object_unref(pm);
 827
 828   gtk_widget_destroy(window);
 829
 830   // Override any of the default colors with ones that were specified by the
 831   // theme.
 832   if (theme_thumb_active) {
 833     *thumb_active_color = *theme_thumb_active;
 834     gdk_color_free(theme_thumb_active);
 835   }
 836
 837   if (theme_thumb_inactive) {
 838     *thumb_inactive_color = *theme_thumb_inactive;
 839     gdk_color_free(theme_thumb_inactive);
 840   }
 841
 842   if (theme_trough_color) {
 843     *track_color = *theme_trough_color;
 844     gdk_color_free(theme_trough_color);
 845   }
 846 }
 847
 848 void Gtk2UI::LoadGtkValues() {
 849   // TODO(erg): GtkThemeService had a comment here about having to muck with
 850   // the raw Prefs object to remove prefs::kCurrentThemeImages or else we'd
 851   // regress startup time. Figure out how to do that when we can't access the
 852   // prefs system from here.
 853
 854   GtkStyle* frame_style = gtk_rc_get_style(fake_frame_);
 855
 856   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
 857   SetThemeColorFromGtk(ThemeProperties::COLOR_CONTROL_BACKGROUND,
 858                        &window_style->bg[GTK_STATE_NORMAL]);
 859
 860   GdkColor toolbar_color = window_style->bg[GTK_STATE_NORMAL];
 861   SetThemeColorFromGtk(ThemeProperties::COLOR_TOOLBAR, &toolbar_color);
 862
 863   GdkColor button_color = window_style->bg[GTK_STATE_SELECTED];
 864   SetThemeTintFromGtk(ThemeProperties::TINT_BUTTONS, &button_color);
 865
 866   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
 867   GdkColor label_color = label_style->fg[GTK_STATE_NORMAL];
 868   SetThemeColorFromGtk(ThemeProperties::COLOR_TAB_TEXT, &label_color);
 869   SetThemeColorFromGtk(ThemeProperties::COLOR_BOOKMARK_TEXT, &label_color);
 870   SetThemeColorFromGtk(ThemeProperties::COLOR_STATUS_BAR_TEXT, &label_color);
 871
 872   UpdateDefaultFont(label_style->font_desc);
 873
 874   // Build the various icon tints.
 875   GetNormalButtonTintHSL(&button_tint_);
 876   GetNormalEntryForegroundHSL(&entry_tint_);
 877   GetSelectedEntryForegroundHSL(&selected_entry_tint_);
 878   GdkColor frame_color = BuildFrameColors(frame_style);
 879
 880   // The inactive frame color never occurs naturally in the theme, as it is a
 881   // tinted version of |frame_color|. We generate another color based on the
 882   // background tab color, with the lightness and saturation moved in the
 883   // opposite direction. (We don't touch the hue, since there should be subtle
 884   // hints of the color in the text.)
 885   color_utils::HSL inactive_tab_text_hsl =
 886       tints_[ThemeProperties::TINT_BACKGROUND_TAB];
 887   if (inactive_tab_text_hsl.l < 0.5)
 888     inactive_tab_text_hsl.l = kDarkInactiveLuminance;
 889   else
 890     inactive_tab_text_hsl.l = kLightInactiveLuminance;
 891
 892   if (inactive_tab_text_hsl.s < 0.5)
 893     inactive_tab_text_hsl.s = kHeavyInactiveSaturation;
 894   else
 895     inactive_tab_text_hsl.s = kLightInactiveSaturation;
 896
 897   colors_[ThemeProperties::COLOR_BACKGROUND_TAB_TEXT] =
 898       color_utils::HSLToSkColor(inactive_tab_text_hsl, 255);
 899
 900   // We pick the text and background colors for the NTP out of the colors for a
 901   // GtkEntry. We do this because GtkEntries background color is never the same
 902   // as |toolbar_color|, is usually a white, and when it isn't a white,
 903   // provides sufficient contrast to |toolbar_color|. Try this out with
 904   // Darklooks, HighContrastInverse or ThinIce.
 905   GtkStyle* entry_style = gtk_rc_get_style(fake_entry_.get());
 906   GdkColor ntp_background = entry_style->base[GTK_STATE_NORMAL];
 907   GdkColor ntp_foreground = entry_style->text[GTK_STATE_NORMAL];
 908   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_BACKGROUND,
 909                        &ntp_background);
 910   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_TEXT,
 911                        &ntp_foreground);
 912
 913   // The NTP header is the color that surrounds the current active thumbnail on
 914   // the NTP, and acts as the border of the "Recent Links" box. It would be
 915   // awesome if they were separated so we could use GetBorderColor() for the
 916   // border around the "Recent Links" section, but matching the frame color is
 917   // more important.
 918   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_HEADER,
 919                        &frame_color);
 920   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION,
 921                        &toolbar_color);
 922   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_TEXT,
 923                        &label_color);
 924
 925   // Override the link color if the theme provides it.
 926   const GdkColor* link_color = NULL;
 927   gtk_widget_style_get(GTK_WIDGET(fake_window_),
 928                        "link-color", &link_color, NULL);
 929
 930   bool is_default_link_color = false;
 931   if (!link_color) {
 932     link_color = &kDefaultLinkColor;
 933     is_default_link_color = true;
 934   }
 935
 936   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK,
 937                        link_color);
 938   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK_UNDERLINE,
 939                        link_color);
 940   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK,
 941                        link_color);
 942   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK_UNDERLINE,
 943                        link_color);
 944
 945   if (!is_default_link_color)
 946     gdk_color_free(const_cast<GdkColor*>(link_color));
 947
 948   // Generate the colors that we pass to WebKit.
 949   focus_ring_color_ = GdkColorToSkColor(frame_color);
 950
 951   GdkColor thumb_active_color, thumb_inactive_color, track_color;
 952   Gtk2UI::GetScrollbarColors(&thumb_active_color,
 953                              &thumb_inactive_color,
 954                              &track_color);
 955   thumb_active_color_ = GdkColorToSkColor(thumb_active_color);
 956   thumb_inactive_color_ = GdkColorToSkColor(thumb_inactive_color);
 957   track_color_ = GdkColorToSkColor(track_color);
 958
 959   // Some GTK themes only define the text selection colors on the GtkEntry
 960   // class, so we need to use that for getting selection colors.
 961   active_selection_bg_color_ =
 962       GdkColorToSkColor(entry_style->base[GTK_STATE_SELECTED]);
 963   active_selection_fg_color_ =
 964       GdkColorToSkColor(entry_style->text[GTK_STATE_SELECTED]);
 965   inactive_selection_bg_color_ =
 966       GdkColorToSkColor(entry_style->base[GTK_STATE_ACTIVE]);
 967   inactive_selection_fg_color_ =
 968       GdkColorToSkColor(entry_style->text[GTK_STATE_ACTIVE]);
 969 }
 970
 971 GdkColor Gtk2UI::BuildFrameColors(GtkStyle* frame_style) {
 972   GdkColor* theme_frame = NULL;
 973   GdkColor* theme_inactive_frame = NULL;
 974   GdkColor* theme_incognito_frame = NULL;
 975   GdkColor* theme_incognito_inactive_frame = NULL;
 976   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
 977                        "frame-color", &theme_frame,
 978                        "inactive-frame-color", &theme_inactive_frame,
 979                        "incognito-frame-color", &theme_incognito_frame,
 980                        "incognito-inactive-frame-color",
 981                        &theme_incognito_inactive_frame,
 982                        NULL);
 983
 984   GdkColor frame_color = BuildAndSetFrameColor(
 985       &frame_style->bg[GTK_STATE_SELECTED],
 986       theme_frame,
 987       kDefaultFrameShift,
 988       ThemeProperties::COLOR_FRAME,
 989       ThemeProperties::TINT_FRAME);
 990   if (theme_frame)
 991     gdk_color_free(theme_frame);
 992   SetThemeTintFromGtk(ThemeProperties::TINT_BACKGROUND_TAB, &frame_color);
 993
 994   BuildAndSetFrameColor(
 995       &frame_style->bg[GTK_STATE_INSENSITIVE],
 996       theme_inactive_frame,
 997       kDefaultFrameShift,
 998       ThemeProperties::COLOR_FRAME_INACTIVE,
 999       ThemeProperties::TINT_FRAME_INACTIVE);
1000   if (theme_inactive_frame)
1001     gdk_color_free(theme_inactive_frame);
1002
1003   BuildAndSetFrameColor(
1004       &frame_color,
1005       theme_incognito_frame,
1006       GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO),
1007       ThemeProperties::COLOR_FRAME_INCOGNITO,
1008       ThemeProperties::TINT_FRAME_INCOGNITO);
1009   if (theme_incognito_frame)
1010     gdk_color_free(theme_incognito_frame);
1011
1012   BuildAndSetFrameColor(
1013       &frame_color,
1014       theme_incognito_inactive_frame,
1015       GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE),
1016       ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
1017       ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE);
1018   if (theme_incognito_inactive_frame)
1019     gdk_color_free(theme_incognito_inactive_frame);
1020
1021   return frame_color;
1022 }
1023
1024 void Gtk2UI::SetThemeColorFromGtk(int id, const GdkColor* color) {
1025   colors_[id] = GdkColorToSkColor(*color);
1026 }
1027
1028 void Gtk2UI::SetThemeTintFromGtk(int id, const GdkColor* color) {
1029   color_utils::HSL default_tint = GetDefaultTint(id);
1030   color_utils::HSL hsl;
1031   color_utils::SkColorToHSL(GdkColorToSkColor(*color), &hsl);
1032
1033   if (default_tint.s != -1)
1034     hsl.s = default_tint.s;
1035
1036   if (default_tint.l != -1)
1037     hsl.l = default_tint.l;
1038
1039   tints_[id] = hsl;
1040 }
1041
1042 GdkColor Gtk2UI::BuildAndSetFrameColor(const GdkColor* base,
1043                                        const GdkColor* gtk_base,
1044                                        const color_utils::HSL& tint,
1045                                        int color_id,
1046                                        int tint_id) {
1047   GdkColor out_color = *base;
1048   if (gtk_base) {
1049     // The theme author specified a color to use, use it without modification.
1050     out_color = *gtk_base;
1051   } else {
1052     // Tint the basic color since this is a heuristic color instead of one
1053     // specified by the theme author.
1054     GdkColorHSLShift(tint, &out_color);
1055   }
1056   SetThemeColorFromGtk(color_id, &out_color);
1057   SetThemeTintFromGtk(tint_id, &out_color);
1058
1059   return out_color;
1060 }
1061
1062 SkBitmap Gtk2UI::GenerateGtkThemeBitmap(int id) const {
1063   switch (id) {
1064     case IDR_THEME_TOOLBAR: {
1065       GtkStyle* style = gtk_rc_get_style(fake_window_);
1066       GdkColor* color = &style->bg[GTK_STATE_NORMAL];
1067       SkBitmap bitmap;
1068       bitmap.allocN32Pixels(kToolbarImageWidth, kToolbarImageHeight);
1069       bitmap.eraseARGB(0xff, color->red >> 8, color->green >> 8,
1070                        color->blue >> 8);
1071       return bitmap;
1072     }
1073     case IDR_THEME_TAB_BACKGROUND:
1074     case IDR_THEME_TAB_BACKGROUND_DESKTOP:
1075       return GenerateTabImage(IDR_THEME_FRAME);
1076     case IDR_THEME_TAB_BACKGROUND_INCOGNITO:
1077     case IDR_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP:
1078       return GenerateTabImage(IDR_THEME_FRAME_INCOGNITO);
1079     case IDR_FRAME:
1080     case IDR_THEME_FRAME:
1081       return GenerateFrameImage(ThemeProperties::COLOR_FRAME,
1082                                 "frame-gradient-color");
1083     case IDR_FRAME_INACTIVE:
1084     case IDR_THEME_FRAME_INACTIVE:
1085       return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INACTIVE,
1086                                 "inactive-frame-gradient-color");
1087     case IDR_THEME_FRAME_INCOGNITO:
1088       return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INCOGNITO,
1089                                 "incognito-frame-gradient-color");
1090     case IDR_THEME_FRAME_INCOGNITO_INACTIVE: {
1091       return GenerateFrameImage(
1092           ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
1093           "incognito-inactive-frame-gradient-color");
1094     }
1095     // Icons that sit inside the omnibox shouldn't receive TINT_BUTTONS and
1096     // instead should tint based on the foreground text entry color in GTK+
1097     // mode because some themes that try to be dark *and* light have very
1098     // different colors between the omnibox and the normal background area.
1099     // TODO(erg): Decide what to do about other icons that appear in the
1100     // omnibox, e.g. content settings icons.
1101     case IDR_OMNIBOX_CALCULATOR:
1102     case IDR_OMNIBOX_EXTENSION_APP:
1103     case IDR_OMNIBOX_HTTP:
1104     case IDR_OMNIBOX_SEARCH:
1105     case IDR_OMNIBOX_STAR:
1106     case IDR_OMNIBOX_TTS: {
1107       return GenerateTintedIcon(id, entry_tint_);
1108     }
1109     // In GTK mode, the dark versions of the omnibox icons only ever appear in
1110     // the autocomplete popup and only against the current theme's GtkEntry
1111     // base[GTK_STATE_SELECTED] color, so tint the icons so they won't collide
1112     // with the selected color.
1113     case IDR_OMNIBOX_EXTENSION_APP_DARK:
1114     case IDR_OMNIBOX_HTTP_DARK:
1115     case IDR_OMNIBOX_SEARCH_DARK:
1116     case IDR_OMNIBOX_STAR_DARK:
1117     case IDR_OMNIBOX_TTS_DARK: {
1118       return GenerateTintedIcon(id, selected_entry_tint_);
1119     }
1120     // In GTK mode, we need to manually render several icons.
1121     case IDR_BACK:
1122     case IDR_BACK_D:
1123     case IDR_FORWARD:
1124     case IDR_FORWARD_D:
1125     case IDR_HOME:
1126     case IDR_RELOAD:
1127     case IDR_RELOAD_D:
1128     case IDR_STOP:
1129     case IDR_STOP_D: {
1130       return GenerateGTKIcon(id);
1131     }
1132     case IDR_TOOLBAR_BEZEL_HOVER:
1133       return GenerateToolbarBezel(GTK_STATE_PRELIGHT, IDR_TOOLBAR_BEZEL_HOVER);
1134     case IDR_TOOLBAR_BEZEL_PRESSED:
1135       return GenerateToolbarBezel(GTK_STATE_ACTIVE, IDR_TOOLBAR_BEZEL_PRESSED);
1136     default: {
1137       return GenerateTintedIcon(id, button_tint_);
1138     }
1139   }
1140
1141   return SkBitmap();
1142 }
1143
1144 SkBitmap Gtk2UI::GenerateFrameImage(
1145     int color_id,
1146     const char* gradient_name) const {
1147   // We use two colors: the main color (passed in) and a lightened version of
1148   // that color (which is supposed to match the light gradient at the top of
1149   // several GTK+ themes, such as Ambiance, Clearlooks or Bluebird).
1150   ColorMap::const_iterator it = colors_.find(color_id);
1151   DCHECK(it != colors_.end());
1152   SkColor base = it->second;
1153
1154   gfx::Canvas canvas(gfx::Size(kToolbarImageWidth, kToolbarImageHeight),
1155       1.0f, true);
1156
1157   int gradient_size;
1158   GdkColor* gradient_top_color = NULL;
1159   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
1160                        "frame-gradient-size", &gradient_size,
1161                        gradient_name, &gradient_top_color,
1162                        NULL);
1163   if (gradient_size) {
1164     SkColor lighter = gradient_top_color ?
1165         GdkColorToSkColor(*gradient_top_color) :
1166         color_utils::HSLShift(base, kGtkFrameShift);
1167     skia::RefPtr<SkShader> shader = gfx::CreateGradientShader(
1168         0, gradient_size, lighter, base);
1169     SkPaint paint;
1170     paint.setStyle(SkPaint::kFill_Style);
1171     paint.setAntiAlias(true);
1172     paint.setShader(shader.get());
1173
1174     canvas.DrawRect(gfx::Rect(0, 0, kToolbarImageWidth, gradient_size), paint);
1175   }
1176
1177   if (gradient_top_color)
1178     gdk_color_free(gradient_top_color);
1179
1180   canvas.FillRect(gfx::Rect(0, gradient_size, kToolbarImageWidth,
1181                             kToolbarImageHeight - gradient_size), base);
1182   return canvas.ExtractImageRep().sk_bitmap();
1183 }
1184
1185 SkBitmap Gtk2UI::GenerateTabImage(int base_id) const {
1186   const SkBitmap* base_image = GetThemeImageNamed(base_id).ToSkBitmap();
1187   SkBitmap bg_tint = SkBitmapOperations::CreateHSLShiftedBitmap(
1188       *base_image, GetDefaultTint(ThemeProperties::TINT_BACKGROUND_TAB));
1189   return SkBitmapOperations::CreateTiledBitmap(
1190       bg_tint, 0, 0, bg_tint.width(), bg_tint.height());
1191 }
1192
1193 SkBitmap Gtk2UI::GenerateTintedIcon(
1194     int base_id,
1195     const color_utils::HSL& tint) const {
1196   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1197   return SkBitmapOperations::CreateHSLShiftedBitmap(
1198       rb.GetImageNamed(base_id).AsBitmap(), tint);
1199 }
1200
1201 SkBitmap Gtk2UI::GenerateGTKIcon(int base_id) const {
1202   const char* stock_id = NULL;
1203   GtkStateType gtk_state = GTK_STATE_NORMAL;
1204   for (unsigned int i = 0; i < arraysize(kGtkIcons); ++i) {
1205     if (kGtkIcons[i].idr == base_id) {
1206       stock_id = kGtkIcons[i].stock_id;
1207       gtk_state = kGtkIcons[i].gtk_state;
1208       break;
1209     }
1210   }
1211   DCHECK(stock_id);
1212
1213   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1214   SkBitmap default_bitmap = rb.GetImageNamed(base_id).AsBitmap();
1215
1216   gtk_widget_ensure_style(fake_frame_);
1217   GtkStyle* style = gtk_widget_get_style(fake_frame_);
1218   GtkIconSet* icon_set = gtk_style_lookup_icon_set(style, stock_id);
1219   if (!icon_set)
1220     return default_bitmap;
1221
1222   // Ask GTK to render the icon to a buffer, which we will steal from.
1223   GdkPixbuf* gdk_icon = gtk_icon_set_render_icon(
1224       icon_set,
1225       style,
1226       base::i18n::IsRTL() ? GTK_TEXT_DIR_RTL : GTK_TEXT_DIR_LTR,
1227       gtk_state,
1228       GTK_ICON_SIZE_SMALL_TOOLBAR,
1229       fake_frame_,
1230       NULL);
1231
1232   if (!gdk_icon) {
1233     // This can theoretically happen if an icon theme doesn't provide a
1234     // specific image. This should realistically never happen, but I bet there
1235     // are some theme authors who don't reliably provide all icons.
1236     return default_bitmap;
1237   }
1238
1239   SkBitmap retval;
1240   retval.allocN32Pixels(default_bitmap.width(), default_bitmap.height());
1241   retval.eraseColor(0);
1242
1243   const SkBitmap icon = GdkPixbufToImageSkia(gdk_icon);
1244   g_object_unref(gdk_icon);
1245
1246   SkCanvas canvas(retval);
1247
1248   if (gtk_state == GTK_STATE_ACTIVE || gtk_state == GTK_STATE_PRELIGHT) {
1249     SkBitmap border = DrawGtkButtonBorder(gtk_state,
1250                                           false,
1251                                           false,
1252                                           default_bitmap.width(),
1253                                           default_bitmap.height());
1254     canvas.drawBitmap(border, 0, 0);
1255   }
1256
1257   canvas.drawBitmap(icon,
1258                     (default_bitmap.width() / 2) - (icon.width() / 2),
1259                     (default_bitmap.height() / 2) - (icon.height() / 2));
1260
1261   return retval;
1262 }
1263
1264 SkBitmap Gtk2UI::GenerateToolbarBezel(int gtk_state, int sizing_idr) const {
1265   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1266   SkBitmap default_bitmap =
1267       rb.GetImageNamed(sizing_idr).AsBitmap();
1268
1269   SkBitmap retval;
1270   retval.allocN32Pixels(default_bitmap.width(), default_bitmap.height());
1271   retval.eraseColor(0);
1272
1273   SkCanvas canvas(retval);
1274   SkBitmap border = DrawGtkButtonBorder(
1275       gtk_state,
1276       false,
1277       false,
1278       default_bitmap.width(),
1279       default_bitmap.height());
1280   canvas.drawBitmap(border, 0, 0);
1281
1282   return retval;
1283 }
1284
1285 void Gtk2UI::GetNormalButtonTintHSL(color_utils::HSL* tint) const {
1286   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
1287   const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];
1288   const GdkColor base_color = window_style->base[GTK_STATE_NORMAL];
1289
1290   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
1291   const GdkColor text_color = label_style->fg[GTK_STATE_NORMAL];
1292
1293   PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
1294 }
1295
1296 void Gtk2UI::GetNormalEntryForegroundHSL(color_utils::HSL* tint) const {
1297   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
1298   const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];
1299
1300   GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
1301   const GdkColor text_color = style->text[GTK_STATE_NORMAL];
1302   const GdkColor base_color = style->base[GTK_STATE_NORMAL];
1303
1304   PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
1305 }
1306
1307 void Gtk2UI::GetSelectedEntryForegroundHSL(color_utils::HSL* tint) const {
1308   // The simplest of all the tints. We just use the selected text in the entry
1309   // since the icons tinted this way will only be displayed against
1310   // base[GTK_STATE_SELECTED].
1311   GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
1312   const GdkColor color = style->text[GTK_STATE_SELECTED];
1313   color_utils::SkColorToHSL(GdkColorToSkColor(color), tint);
1314 }
1315
1316 SkBitmap Gtk2UI::DrawGtkButtonBorder(int gtk_state,
1317                                      bool focused,
1318                                      bool call_to_action,
1319                                      int width,
1320                                      int height) const {
1321   // Create a temporary GTK button to snapshot
1322   GtkWidget* window = gtk_offscreen_window_new();
1323   GtkWidget* button = gtk_button_new();
1324   gtk_widget_set_size_request(button, width, height);
1325   gtk_container_add(GTK_CONTAINER(window), button);
1326   gtk_widget_realize(window);
1327   gtk_widget_realize(button);
1328   gtk_widget_show(button);
1329   gtk_widget_show(window);
1330
1331   if (call_to_action)
1332     GTK_WIDGET_SET_FLAGS(button, GTK_HAS_DEFAULT);
1333
1334   if (focused) {
1335     // We can't just use gtk_widget_grab_focus() here because that sets
1336     // gtk_widget_is_focus(), but not gtk_widget_has_focus(), which is what the
1337     // GtkButton's paint checks.
1338     GTK_WIDGET_SET_FLAGS(button, GTK_HAS_FOCUS);
1339   }
1340
1341   gtk_widget_set_state(button, static_cast<GtkStateType>(gtk_state));
1342
1343   GdkPixmap* pixmap;
1344   {
1345     // http://crbug.com/346740
1346     ANNOTATE_SCOPED_MEMORY_LEAK;
1347     pixmap = gtk_widget_get_snapshot(button, NULL);
1348   }
1349   int w, h;
1350   gdk_drawable_get_size(GDK_DRAWABLE(pixmap), &w, &h);
1351   DCHECK_EQ(w, width);
1352   DCHECK_EQ(h, height);
1353
1354   // We render the Pixmap to a Pixbuf. This can be slow, as we're scrapping
1355   // bits from X.
1356   GdkColormap* colormap = gdk_drawable_get_colormap(pixmap);
1357   GdkPixbuf* pixbuf = gdk_pixbuf_get_from_drawable(NULL,
1358                                                    GDK_DRAWABLE(pixmap),
1359                                                    colormap,
1360                                                    0, 0, 0, 0, w, h);
1361
1362   // Finally, we convert our pixbuf into a type we can use.
1363   SkBitmap border = GdkPixbufToImageSkia(pixbuf);
1364   g_object_unref(pixbuf);
1365   g_object_unref(pixmap);
1366   gtk_widget_destroy(window);
1367
1368   return border;
1369 }
1370
1371 void Gtk2UI::ClearAllThemeData() {
1372   gtk_images_.clear();
1373 }
1374
1375 void Gtk2UI::UpdateDefaultFont(const PangoFontDescription* desc) {
1376   // Use gfx::FontRenderParams to select a family and determine the rendering
1377   // settings.
1378   gfx::FontRenderParamsQuery query;
1379   base::SplitString(pango_font_description_get_family(desc), ',',
1380                     &query.families);
1381
1382   if (pango_font_description_get_size_is_absolute(desc)) {
1383     // If the size is absolute, it's specified in Pango units. There are
1384     // PANGO_SCALE Pango units in a device unit (pixel).
1385     const int size_pixels = pango_font_description_get_size(desc) / PANGO_SCALE;
1386     default_font_size_pixels_ = size_pixels;
1387     query.pixel_size = size_pixels;
1388   } else {
1389     // Non-absolute sizes are in points (again scaled by PANGO_SIZE).
1390     // Round the value when converting to pixels to match GTK's logic.
1391     const double size_points = pango_font_description_get_size(desc) /
1392         static_cast<double>(PANGO_SCALE);
1393     default_font_size_pixels_ = static_cast<int>(
1394         GetPixelsInPoint(device_scale_factor_) * size_points + 0.5);
1395     query.point_size = static_cast<int>(size_points);
1396   }
1397
1398   query.style = gfx::Font::NORMAL;
1399   // TODO(davemoore): Support weights other than bold?
1400   if (pango_font_description_get_weight(desc) == PANGO_WEIGHT_BOLD)
1401     query.style |= gfx::Font::BOLD;
1402   // TODO(davemoore): What about PANGO_STYLE_OBLIQUE?
1403   if (pango_font_description_get_style(desc) == PANGO_STYLE_ITALIC)
1404     query.style |= gfx::Font::ITALIC;
1405
1406   default_font_render_params_ =
1407       gfx::GetFontRenderParams(query, &default_font_family_);
1408   default_font_style_ = query.style;
1409 }
1410
1411 void Gtk2UI::OnStyleSet(GtkWidget* widget, GtkStyle* previous_style) {
1412   ClearAllThemeData();
1413   LoadGtkValues();
1414   NativeThemeGtk2::instance()->NotifyObservers();
1415 }
1416
1417 void Gtk2UI::UpdateDeviceScaleFactor(float device_scale_factor) {
1418   device_scale_factor_ = device_scale_factor;
1419   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
1420   UpdateDefaultFont(label_style->font_desc);
1421 }
1422
1423 }  // namespace libgtk2ui
1424
1425 views::LinuxUI* BuildGtk2UI() {
1426   return new libgtk2ui::Gtk2UI;
1427 }