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_EXTENSION_APP,
 165   IDR_OMNIBOX_HTTP,
 166   IDR_OMNIBOX_HTTP_DARK,
 167   IDR_OMNIBOX_SEARCH,
 168   IDR_OMNIBOX_SEARCH_DARK,
 169   IDR_OMNIBOX_STAR,
 170   IDR_OMNIBOX_STAR_DARK,
 171   IDR_OMNIBOX_TTS,
 172   IDR_OMNIBOX_TTS_DARK,
 173 };
 174
 175 // This table converts button ids into a pair of gtk-stock id and state.
 176 struct IDRGtkMapping {
 177   int idr;
 178   const char* stock_id;
 179   GtkStateType gtk_state;
 180 } const kGtkIcons[] = {
 181   { IDR_BACK,      GTK_STOCK_GO_BACK,    GTK_STATE_NORMAL },
 182   { IDR_BACK_D,    GTK_STOCK_GO_BACK,    GTK_STATE_INSENSITIVE },
 183
 184   { IDR_FORWARD,   GTK_STOCK_GO_FORWARD, GTK_STATE_NORMAL },
 185   { IDR_FORWARD_D, GTK_STOCK_GO_FORWARD, GTK_STATE_INSENSITIVE },
 186
 187   { IDR_HOME,      GTK_STOCK_HOME,       GTK_STATE_NORMAL },
 188
 189   { IDR_RELOAD,    GTK_STOCK_REFRESH,    GTK_STATE_NORMAL },
 190   { IDR_RELOAD_D,  GTK_STOCK_REFRESH,    GTK_STATE_INSENSITIVE },
 191
 192   { IDR_STOP,      GTK_STOCK_STOP,       GTK_STATE_NORMAL },
 193   { IDR_STOP_D,    GTK_STOCK_STOP,       GTK_STATE_INSENSITIVE },
 194 };
 195
 196 // The image resources that will be tinted by the 'button' tint value.
 197 const int kOtherToolbarButtonIDs[] = {
 198   IDR_TOOLBAR_BEZEL_HOVER,
 199   IDR_TOOLBAR_BEZEL_PRESSED,
 200   IDR_BROWSER_ACTIONS_OVERFLOW,
 201   IDR_THROBBER,
 202   IDR_THROBBER_WAITING,
 203   IDR_THROBBER_LIGHT,
 204
 205   // TODO(erg): The dropdown arrow should be tinted because we're injecting
 206   // various background GTK colors, but the code that accesses them needs to be
 207   // modified so that they ask their ui::ThemeProvider instead of the
 208   // ResourceBundle. (i.e. in a light on dark theme, the dropdown arrow will be
 209   // dark on dark)
 210   IDR_MENU_DROPARROW
 211 };
 212
 213 bool IsOverridableImage(int id) {
 214   CR_DEFINE_STATIC_LOCAL(std::set<int>, images, ());
 215   if (images.empty()) {
 216     images.insert(kThemeImages, kThemeImages + arraysize(kThemeImages));
 217     images.insert(kAutocompleteImages,
 218                   kAutocompleteImages + arraysize(kAutocompleteImages));
 219
 220     for (unsigned int i = 0; i < arraysize(kGtkIcons); ++i)
 221       images.insert(kGtkIcons[i].idr);
 222
 223     images.insert(kOtherToolbarButtonIDs,
 224                   kOtherToolbarButtonIDs + arraysize(kOtherToolbarButtonIDs));
 225   }
 226
 227   return images.count(id) > 0;
 228 }
 229
 230 // Picks a button tint from a set of background colors. While
 231 // |accent_gdk_color| will usually be the same color through a theme, this
 232 // function will get called with the normal GtkLabel |text_color|/GtkWindow
 233 // |background_color| pair and the GtkEntry |text_color|/|background_color|
 234 // pair. While 3/4 of the time the resulting tint will be the same, themes that
 235 // have a dark window background (with light text) and a light text entry (with
 236 // dark text) will get better icons with this separated out.
 237 void PickButtonTintFromColors(const GdkColor& accent_gdk_color,
 238                               const GdkColor& text_color,
 239                               const GdkColor& background_color,
 240                               color_utils::HSL* tint) {
 241   SkColor accent_color = GdkColorToSkColor(accent_gdk_color);
 242   color_utils::HSL accent_tint;
 243   color_utils::SkColorToHSL(accent_color, &accent_tint);
 244
 245   color_utils::HSL text_tint;
 246   color_utils::SkColorToHSL(GdkColorToSkColor(text_color),
 247                             &text_tint);
 248
 249   color_utils::HSL background_tint;
 250   color_utils::SkColorToHSL(GdkColorToSkColor(background_color),
 251                             &background_tint);
 252
 253   // If the accent color is gray, then our normal HSL tomfoolery will bring out
 254   // whatever color is oddly dominant (for example, in rgb space [125, 128,
 255   // 125] will tint green instead of gray). Slight differences (+/-10 (4%) to
 256   // all color components) should be interpreted as this color being gray and
 257   // we should switch into a special grayscale mode.
 258   int rb_diff = abs(static_cast<int>(SkColorGetR(accent_color)) -
 259                     static_cast<int>(SkColorGetB(accent_color)));
 260   int rg_diff = abs(static_cast<int>(SkColorGetR(accent_color)) -
 261                     static_cast<int>(SkColorGetG(accent_color)));
 262   int bg_diff = abs(static_cast<int>(SkColorGetB(accent_color)) -
 263                     static_cast<int>(SkColorGetG(accent_color)));
 264   if (rb_diff < 10 && rg_diff < 10 && bg_diff < 10) {
 265     // Our accent is white/gray/black. Only the luminance of the accent color
 266     // matters.
 267     tint->h = -1;
 268
 269     // Use the saturation of the text.
 270     tint->s = text_tint.s;
 271
 272     // Use the luminance of the accent color UNLESS there isn't enough
 273     // luminance contrast between the accent color and the base color.
 274     if (fabs(accent_tint.l - background_tint.l) > 0.3)
 275       tint->l = accent_tint.l;
 276     else
 277       tint->l = text_tint.l;
 278   } else {
 279     // Our accent is a color.
 280     tint->h = accent_tint.h;
 281
 282     // Don't modify the saturation; the amount of color doesn't matter.
 283     tint->s = -1;
 284
 285     // If the text wants us to darken the icon, don't change the luminance (the
 286     // icons are already dark enough). Otherwise, lighten the icon by no more
 287     // than 0.9 since we don't want a pure-white icon even if the text is pure
 288     // white.
 289     if (text_tint.l < 0.5)
 290       tint->l = -1;
 291     else if (text_tint.l <= 0.9)
 292       tint->l = text_tint.l;
 293     else
 294       tint->l = 0.9;
 295   }
 296 }
 297
 298 // Applies an HSL shift to a GdkColor (instead of an SkColor)
 299 void GdkColorHSLShift(const color_utils::HSL& shift, GdkColor* frame_color) {
 300   SkColor shifted = color_utils::HSLShift(
 301       GdkColorToSkColor(*frame_color), shift);
 302
 303   frame_color->pixel = 0;
 304   frame_color->red = SkColorGetR(shifted) * kSkiaToGDKMultiplier;
 305   frame_color->green = SkColorGetG(shifted) * kSkiaToGDKMultiplier;
 306   frame_color->blue = SkColorGetB(shifted) * kSkiaToGDKMultiplier;
 307 }
 308
 309 // Copied Default blah sections from ThemeService.
 310 color_utils::HSL GetDefaultTint(int id) {
 311   switch (id) {
 312     case ThemeProperties::TINT_FRAME:
 313       return kDefaultTintFrame;
 314     case ThemeProperties::TINT_FRAME_INACTIVE:
 315       return kDefaultTintFrameInactive;
 316     case ThemeProperties::TINT_FRAME_INCOGNITO:
 317       return kDefaultTintFrameIncognito;
 318     case ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE:
 319       return kDefaultTintFrameIncognitoInactive;
 320     case ThemeProperties::TINT_BUTTONS:
 321       return kDefaultTintButtons;
 322     case ThemeProperties::TINT_BACKGROUND_TAB:
 323       return kDefaultTintBackgroundTab;
 324     default:
 325       color_utils::HSL result = {-1, -1, -1};
 326       return result;
 327   }
 328 }
 329
 330 // Returns a gfx::FontRenderParams corresponding to GTK's configuration.
 331 gfx::FontRenderParams GetGtkFontRenderParams() {
 332   GtkSettings* gtk_settings = gtk_settings_get_default();
 333   CHECK(gtk_settings);
 334   gint antialias = 0;
 335   gint hinting = 0;
 336   gchar* hint_style = NULL;
 337   gchar* rgba = NULL;
 338   g_object_get(gtk_settings,
 339                "gtk-xft-antialias", &antialias,
 340                "gtk-xft-hinting", &hinting,
 341                "gtk-xft-hintstyle", &hint_style,
 342                "gtk-xft-rgba", &rgba,
 343                NULL);
 344
 345   gfx::FontRenderParams params;
 346   params.antialiasing = antialias != 0;
 347
 348   if (hinting == 0 || !hint_style || strcmp(hint_style, "hintnone") == 0) {
 349     params.hinting = gfx::FontRenderParams::HINTING_NONE;
 350   } else if (strcmp(hint_style, "hintslight") == 0) {
 351     params.hinting = gfx::FontRenderParams::HINTING_SLIGHT;
 352   } else if (strcmp(hint_style, "hintmedium") == 0) {
 353     params.hinting = gfx::FontRenderParams::HINTING_MEDIUM;
 354   } else if (strcmp(hint_style, "hintfull") == 0) {
 355     params.hinting = gfx::FontRenderParams::HINTING_FULL;
 356   } else {
 357     LOG(WARNING) << "Unexpected gtk-xft-hintstyle \"" << hint_style << "\"";
 358     params.hinting = gfx::FontRenderParams::HINTING_NONE;
 359   }
 360
 361   if (!rgba || strcmp(rgba, "none") == 0) {
 362     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE;
 363   } else if (strcmp(rgba, "rgb") == 0) {
 364     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_RGB;
 365   } else if (strcmp(rgba, "bgr") == 0) {
 366     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_BGR;
 367   } else if (strcmp(rgba, "vrgb") == 0) {
 368     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_VRGB;
 369   } else if (strcmp(rgba, "vbgr") == 0) {
 370     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_VBGR;
 371   } else {
 372     LOG(WARNING) << "Unexpected gtk-xft-rgba \"" << rgba << "\"";
 373     params.subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE;
 374   }
 375
 376   g_free(hint_style);
 377   g_free(rgba);
 378
 379   return params;
 380 }
 381
 382 // Queries GTK for its font DPI setting and returns the number of pixels in a
 383 // point.
 384 double GetPixelsInPoint() {
 385   GtkSettings* gtk_settings = gtk_settings_get_default();
 386   CHECK(gtk_settings);
 387   gint gtk_dpi = -1;
 388   g_object_get(gtk_settings, "gtk-xft-dpi", &gtk_dpi, NULL);
 389
 390   // GTK multiplies the DPI by 1024 before storing it.
 391   double dpi = (gtk_dpi > 0) ? gtk_dpi / 1024.0 : 96.0;
 392
 393   // There are 72 points in an inch.
 394   return dpi / 72.0;
 395 }
 396
 397 views::LinuxUI::NonClientMiddleClickAction GetDefaultMiddleClickAction() {
 398   scoped_ptr<base::Environment> env(base::Environment::Create());
 399   switch (base::nix::GetDesktopEnvironment(env.get())) {
 400     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
 401       // Starting with KDE 4.4, windows' titlebars can be dragged with the
 402       // middle mouse button to create tab groups. We don't support that in
 403       // Chrome, but at least avoid lowering windows in response to middle
 404       // clicks to avoid surprising users who expect the KDE behavior.
 405       return views::LinuxUI::MIDDLE_CLICK_ACTION_NONE;
 406     default:
 407       return views::LinuxUI::MIDDLE_CLICK_ACTION_LOWER;
 408   }
 409 }
 410
 411 }  // namespace
 412
 413 Gtk2UI::Gtk2UI()
 414     : default_font_size_pixels_(0),
 415       default_font_style_(gfx::Font::NORMAL),
 416       middle_click_action_(GetDefaultMiddleClickAction()) {
 417   GtkInitFromCommandLine(*base::CommandLine::ForCurrentProcess());
 418 }
 419
 420 void Gtk2UI::Initialize() {
 421   signals_.reset(new Gtk2SignalRegistrar);
 422
 423   // Create our fake widgets.
 424   fake_window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 425   fake_frame_ = chrome_gtk_frame_new();
 426   fake_label_.Own(gtk_label_new(""));
 427   fake_entry_.Own(gtk_entry_new());
 428
 429   // Only realized widgets receive style-set notifications, which we need to
 430   // broadcast new theme images and colors. Only realized widgets have style
 431   // properties, too, which we query for some colors.
 432   gtk_widget_realize(fake_frame_);
 433   gtk_widget_realize(fake_window_);
 434
 435   signals_->Connect(fake_frame_, "style-set",
 436                     G_CALLBACK(&OnStyleSetThunk), this);
 437
 438   LoadGtkValues();
 439
 440   printing::PrintingContextLinux::SetCreatePrintDialogFunction(
 441       &PrintDialogGtk2::CreatePrintDialog);
 442   printing::PrintingContextLinux::SetPdfPaperSizeFunction(
 443       &GetPdfPaperSizeDeviceUnitsGtk);
 444
 445 #if defined(USE_GCONF)
 446   // We must build this after GTK gets initialized.
 447   gconf_listener_.reset(new GConfListener(this));
 448 #endif  // defined(USE_GCONF)
 449
 450   indicators_count = 0;
 451
 452   // Instantiate the singleton instance of Gtk2EventLoop.
 453   Gtk2EventLoop::GetInstance();
 454 }
 455
 456 Gtk2UI::~Gtk2UI() {
 457   gtk_widget_destroy(fake_window_);
 458   gtk_widget_destroy(fake_frame_);
 459   fake_label_.Destroy();
 460   fake_entry_.Destroy();
 461
 462   ClearAllThemeData();
 463 }
 464
 465 gfx::Image Gtk2UI::GetThemeImageNamed(int id) const {
 466   // Try to get our cached version:
 467   ImageCache::const_iterator it = gtk_images_.find(id);
 468   if (it != gtk_images_.end())
 469     return it->second;
 470
 471   if (IsOverridableImage(id)) {
 472     gfx::Image image = gfx::Image(
 473         gfx::ImageSkia::CreateFrom1xBitmap(GenerateGtkThemeBitmap(id)));
 474     gtk_images_[id] = image;
 475     return image;
 476   }
 477
 478   return gfx::Image();
 479 }
 480
 481 bool Gtk2UI::GetColor(int id, SkColor* color) const {
 482   ColorMap::const_iterator it = colors_.find(id);
 483   if (it != colors_.end()) {
 484     *color = it->second;
 485     return true;
 486   }
 487
 488   return false;
 489 }
 490
 491 bool Gtk2UI::HasCustomImage(int id) const {
 492   return IsOverridableImage(id);
 493 }
 494
 495 SkColor Gtk2UI::GetFocusRingColor() const {
 496   return focus_ring_color_;
 497 }
 498
 499 SkColor Gtk2UI::GetThumbActiveColor() const {
 500   return thumb_active_color_;
 501 }
 502
 503 SkColor Gtk2UI::GetThumbInactiveColor() const {
 504   return thumb_inactive_color_;
 505 }
 506
 507 SkColor Gtk2UI::GetTrackColor() const {
 508   return track_color_;
 509 }
 510
 511 SkColor Gtk2UI::GetActiveSelectionBgColor() const {
 512   return active_selection_bg_color_;
 513 }
 514
 515 SkColor Gtk2UI::GetActiveSelectionFgColor() const {
 516   return active_selection_fg_color_;
 517 }
 518
 519 SkColor Gtk2UI::GetInactiveSelectionBgColor() const {
 520   return inactive_selection_bg_color_;
 521 }
 522
 523 SkColor Gtk2UI::GetInactiveSelectionFgColor() const {
 524   return inactive_selection_fg_color_;
 525 }
 526
 527 double Gtk2UI::GetCursorBlinkInterval() const {
 528   // From http://library.gnome.org/devel/gtk/unstable/GtkSettings.html, this is
 529   // the default value for gtk-cursor-blink-time.
 530   static const gint kGtkDefaultCursorBlinkTime = 1200;
 531
 532   // Dividing GTK's cursor blink cycle time (in milliseconds) by this value
 533   // yields an appropriate value for
 534   // content::RendererPreferences::caret_blink_interval.  This matches the
 535   // logic in the WebKit GTK port.
 536   static const double kGtkCursorBlinkCycleFactor = 2000.0;
 537
 538   gint cursor_blink_time = kGtkDefaultCursorBlinkTime;
 539   gboolean cursor_blink = TRUE;
 540   g_object_get(gtk_settings_get_default(),
 541                "gtk-cursor-blink-time", &cursor_blink_time,
 542                "gtk-cursor-blink", &cursor_blink,
 543                NULL);
 544   return cursor_blink ? (cursor_blink_time / kGtkCursorBlinkCycleFactor) : 0.0;
 545 }
 546
 547 ui::NativeTheme* Gtk2UI::GetNativeTheme(aura::Window* window) const {
 548   ui::NativeTheme* native_theme_override = NULL;
 549   if (!native_theme_overrider_.is_null())
 550     native_theme_override = native_theme_overrider_.Run(window);
 551
 552   if (native_theme_override)
 553     return native_theme_override;
 554
 555   return NativeThemeGtk2::instance();
 556 }
 557
 558 void Gtk2UI::SetNativeThemeOverride(const NativeThemeGetter& callback) {
 559   native_theme_overrider_ = callback;
 560 }
 561
 562 bool Gtk2UI::GetDefaultUsesSystemTheme() const {
 563   scoped_ptr<base::Environment> env(base::Environment::Create());
 564
 565   switch (base::nix::GetDesktopEnvironment(env.get())) {
 566     case base::nix::DESKTOP_ENVIRONMENT_GNOME:
 567     case base::nix::DESKTOP_ENVIRONMENT_UNITY:
 568     case base::nix::DESKTOP_ENVIRONMENT_XFCE:
 569       return true;
 570     case base::nix::DESKTOP_ENVIRONMENT_KDE3:
 571     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
 572     case base::nix::DESKTOP_ENVIRONMENT_OTHER:
 573       return false;
 574   }
 575   // Unless GetDesktopEnvironment() badly misbehaves, this should never happen.
 576   NOTREACHED();
 577   return false;
 578 }
 579
 580 void Gtk2UI::SetDownloadCount(int count) const {
 581   if (unity::IsRunning())
 582     unity::SetDownloadCount(count);
 583 }
 584
 585 void Gtk2UI::SetProgressFraction(float percentage) const {
 586   if (unity::IsRunning())
 587     unity::SetProgressFraction(percentage);
 588 }
 589
 590 bool Gtk2UI::IsStatusIconSupported() const {
 591   return true;
 592 }
 593
 594 scoped_ptr<views::StatusIconLinux> Gtk2UI::CreateLinuxStatusIcon(
 595     const gfx::ImageSkia& image,
 596     const base::string16& tool_tip) const {
 597   if (AppIndicatorIcon::CouldOpen()) {
 598     ++indicators_count;
 599     return scoped_ptr<views::StatusIconLinux>(new AppIndicatorIcon(
 600         base::StringPrintf("%s%d", kAppIndicatorIdPrefix, indicators_count),
 601         image,
 602         tool_tip));
 603   } else {
 604     return scoped_ptr<views::StatusIconLinux>(new Gtk2StatusIcon(
 605         image, tool_tip));
 606   }
 607 }
 608
 609 gfx::Image Gtk2UI::GetIconForContentType(
 610     const std::string& content_type,
 611     int size) const {
 612   // This call doesn't take a reference.
 613   GtkIconTheme* theme = gtk_icon_theme_get_default();
 614
 615   std::string content_types[] = {
 616     content_type, kUnknownContentType
 617   };
 618
 619   for (size_t i = 0; i < arraysize(content_types); ++i) {
 620     ScopedGIcon icon(g_content_type_get_icon(content_types[i].c_str()));
 621     ScopedGtkIconInfo icon_info(
 622         gtk_icon_theme_lookup_by_gicon(
 623             theme, icon.get(), size,
 624             static_cast<GtkIconLookupFlags>(GTK_ICON_LOOKUP_FORCE_SIZE)));
 625     if (!icon_info)
 626       continue;
 627     ScopedGdkPixbuf pixbuf(gtk_icon_info_load_icon(icon_info.get(), NULL));
 628     if (!pixbuf)
 629       continue;
 630
 631     SkBitmap bitmap = GdkPixbufToImageSkia(pixbuf.get());
 632     DCHECK_EQ(size, bitmap.width());
 633     DCHECK_EQ(size, bitmap.height());
 634     gfx::ImageSkia image_skia = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
 635     image_skia.MakeThreadSafe();
 636     return gfx::Image(image_skia);
 637   }
 638   return gfx::Image();
 639 }
 640
 641 scoped_ptr<views::Border> Gtk2UI::CreateNativeBorder(
 642     views::LabelButton* owning_button,
 643     scoped_ptr<views::LabelButtonBorder> border) {
 644   if (owning_button->GetNativeTheme() != NativeThemeGtk2::instance())
 645     return border.Pass();
 646
 647   return make_scoped_ptr(new Gtk2Border(this, owning_button, border.Pass()));
 648 }
 649
 650 void Gtk2UI::AddWindowButtonOrderObserver(
 651     views::WindowButtonOrderObserver* observer) {
 652   if (!leading_buttons_.empty() || !trailing_buttons_.empty()) {
 653     observer->OnWindowButtonOrderingChange(leading_buttons_,
 654                                            trailing_buttons_);
 655   }
 656
 657   observer_list_.AddObserver(observer);
 658 }
 659
 660 void Gtk2UI::RemoveWindowButtonOrderObserver(
 661     views::WindowButtonOrderObserver* observer) {
 662   observer_list_.RemoveObserver(observer);
 663 }
 664
 665 void Gtk2UI::SetWindowButtonOrdering(
 666     const std::vector<views::FrameButton>& leading_buttons,
 667     const std::vector<views::FrameButton>& trailing_buttons) {
 668   leading_buttons_ = leading_buttons;
 669   trailing_buttons_ = trailing_buttons;
 670
 671   FOR_EACH_OBSERVER(views::WindowButtonOrderObserver, observer_list_,
 672                     OnWindowButtonOrderingChange(leading_buttons_,
 673                                                  trailing_buttons_));
 674 }
 675
 676 void Gtk2UI::SetNonClientMiddleClickAction(NonClientMiddleClickAction action) {
 677   middle_click_action_ = action;
 678 }
 679
 680 scoped_ptr<ui::LinuxInputMethodContext> Gtk2UI::CreateInputMethodContext(
 681     ui::LinuxInputMethodContextDelegate* delegate) const {
 682   return scoped_ptr<ui::LinuxInputMethodContext>(
 683       new X11InputMethodContextImplGtk2(delegate));
 684 }
 685
 686 gfx::FontRenderParams Gtk2UI::GetDefaultFontRenderParams() const {
 687   static gfx::FontRenderParams params = GetGtkFontRenderParams();
 688   return params;
 689 }
 690
 691 void Gtk2UI::GetDefaultFontDescription(
 692     std::string* family_out,
 693     int* size_pixels_out,
 694     int* style_out,
 695     gfx::FontRenderParams* params_out) const {
 696   *family_out = default_font_family_;
 697   *size_pixels_out = default_font_size_pixels_;
 698   *style_out = default_font_style_;
 699   *params_out = default_font_render_params_;
 700 }
 701
 702 ui::SelectFileDialog* Gtk2UI::CreateSelectFileDialog(
 703     ui::SelectFileDialog::Listener* listener,
 704     ui::SelectFilePolicy* policy) const {
 705   return SelectFileDialogImpl::Create(listener, policy);
 706 }
 707
 708 bool Gtk2UI::UnityIsRunning() {
 709   return unity::IsRunning();
 710 }
 711
 712 views::LinuxUI::NonClientMiddleClickAction
 713 Gtk2UI::GetNonClientMiddleClickAction() {
 714   return middle_click_action_;
 715 }
 716
 717 void Gtk2UI::NotifyWindowManagerStartupComplete() {
 718   // TODO(port) Implement this using _NET_STARTUP_INFO_BEGIN/_NET_STARTUP_INFO
 719   // from http://standards.freedesktop.org/startup-notification-spec/ instead.
 720   gdk_notify_startup_complete();
 721 }
 722
 723 bool Gtk2UI::MatchEvent(const ui::Event& event,
 724                         std::vector<ui::TextEditCommandAuraLinux>* commands) {
 725   // Ensure that we have a keyboard handler.
 726   if (!key_bindings_handler_)
 727     key_bindings_handler_.reset(new Gtk2KeyBindingsHandler);
 728
 729   return key_bindings_handler_->MatchEvent(event, commands);
 730 }
 731
 732 void Gtk2UI::GetScrollbarColors(GdkColor* thumb_active_color,
 733                                 GdkColor* thumb_inactive_color,
 734                                 GdkColor* track_color) {
 735   GdkColor* theme_thumb_active = NULL;
 736   GdkColor* theme_thumb_inactive = NULL;
 737   GdkColor* theme_trough_color = NULL;
 738   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
 739                        "scrollbar-slider-prelight-color", &theme_thumb_active,
 740                        "scrollbar-slider-normal-color", &theme_thumb_inactive,
 741                        "scrollbar-trough-color", &theme_trough_color,
 742                        NULL);
 743
 744   // Ask the theme if the theme specifies all the scrollbar colors and short
 745   // circuit the expensive painting/compositing if we have all of them.
 746   if (theme_thumb_active && theme_thumb_inactive && theme_trough_color) {
 747     *thumb_active_color = *theme_thumb_active;
 748     *thumb_inactive_color = *theme_thumb_inactive;
 749     *track_color = *theme_trough_color;
 750
 751     gdk_color_free(theme_thumb_active);
 752     gdk_color_free(theme_thumb_inactive);
 753     gdk_color_free(theme_trough_color);
 754     return;
 755   }
 756
 757   // Create window containing scrollbar elements
 758   GtkWidget* window    = gtk_window_new(GTK_WINDOW_POPUP);
 759   GtkWidget* fixed     = gtk_fixed_new();
 760   GtkWidget* scrollbar = gtk_hscrollbar_new(NULL);
 761   gtk_container_add(GTK_CONTAINER(window), fixed);
 762   gtk_container_add(GTK_CONTAINER(fixed),  scrollbar);
 763   gtk_widget_realize(window);
 764   gtk_widget_realize(scrollbar);
 765
 766   // Draw scrollbar thumb part and track into offscreen image
 767   const int kWidth  = 100;
 768   const int kHeight = 20;
 769   GtkStyle* style   = gtk_rc_get_style(scrollbar);
 770   GdkWindow* gdk_window = gtk_widget_get_window(window);
 771   GdkPixmap* pm     = gdk_pixmap_new(gdk_window, kWidth, kHeight, -1);
 772   GdkRectangle rect = { 0, 0, kWidth, kHeight };
 773   unsigned char data[3 * kWidth * kHeight];
 774   for (int i = 0; i < 3; ++i) {
 775     if (i < 2) {
 776       // Thumb part
 777       gtk_paint_slider(style, pm,
 778                        i == 0 ? GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
 779                        GTK_SHADOW_OUT, &rect, scrollbar, "slider", 0, 0,
 780                        kWidth, kHeight, GTK_ORIENTATION_HORIZONTAL);
 781     } else {
 782       // Track
 783       gtk_paint_box(style, pm, GTK_STATE_ACTIVE, GTK_SHADOW_IN, &rect,
 784                     scrollbar, "trough-upper", 0, 0, kWidth, kHeight);
 785     }
 786     GdkPixbuf* pb = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB,
 787                                              FALSE, 8, kWidth, kHeight,
 788                                              3 * kWidth, 0, 0);
 789     gdk_pixbuf_get_from_drawable(pb, pm, NULL, 0, 0, 0, 0, kWidth, kHeight);
 790
 791     // Sample pixels
 792     int components[3] = { 0 };
 793     for (int y = 2; y < kHeight - 2; ++y) {
 794       for (int c = 0; c < 3; ++c) {
 795         // Sample a vertical slice of pixels at about one-thirds from the
 796         // left edge. This allows us to avoid any fixed graphics that might be
 797         // located at the edges or in the center of the scrollbar.
 798         // Each pixel is made up of a red, green, and blue component; taking up
 799         // a total of three bytes.
 800         components[c] += data[3 * (kWidth / 3 + y * kWidth) + c];
 801       }
 802     }
 803     GdkColor* color = i == 0 ? thumb_active_color :
 804                       i == 1 ? thumb_inactive_color :
 805                                track_color;
 806     color->pixel = 0;
 807     // We sampled pixels across the full height of the image, ignoring a two
 808     // pixel border. In some themes, the border has a completely different
 809     // color which we do not want to factor into our average color computation.
 810     //
 811     // We now need to scale the colors from the 0..255 range, to the wider
 812     // 0..65535 range, and we need to actually compute the average color; so,
 813     // we divide by the total number of pixels in the sample.
 814     color->red   = components[0] * 65535 / (255 * (kHeight - 4));
 815     color->green = components[1] * 65535 / (255 * (kHeight - 4));
 816     color->blue  = components[2] * 65535 / (255 * (kHeight - 4));
 817
 818     g_object_unref(pb);
 819   }
 820   g_object_unref(pm);
 821
 822   gtk_widget_destroy(window);
 823
 824   // Override any of the default colors with ones that were specified by the
 825   // theme.
 826   if (theme_thumb_active) {
 827     *thumb_active_color = *theme_thumb_active;
 828     gdk_color_free(theme_thumb_active);
 829   }
 830
 831   if (theme_thumb_inactive) {
 832     *thumb_inactive_color = *theme_thumb_inactive;
 833     gdk_color_free(theme_thumb_inactive);
 834   }
 835
 836   if (theme_trough_color) {
 837     *track_color = *theme_trough_color;
 838     gdk_color_free(theme_trough_color);
 839   }
 840 }
 841
 842 void Gtk2UI::LoadGtkValues() {
 843   // TODO(erg): GtkThemeService had a comment here about having to muck with
 844   // the raw Prefs object to remove prefs::kCurrentThemeImages or else we'd
 845   // regress startup time. Figure out how to do that when we can't access the
 846   // prefs system from here.
 847
 848   GtkStyle* frame_style = gtk_rc_get_style(fake_frame_);
 849
 850   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
 851   SetThemeColorFromGtk(ThemeProperties::COLOR_CONTROL_BACKGROUND,
 852                        &window_style->bg[GTK_STATE_NORMAL]);
 853
 854   GdkColor toolbar_color = window_style->bg[GTK_STATE_NORMAL];
 855   SetThemeColorFromGtk(ThemeProperties::COLOR_TOOLBAR, &toolbar_color);
 856
 857   GdkColor button_color = window_style->bg[GTK_STATE_SELECTED];
 858   SetThemeTintFromGtk(ThemeProperties::TINT_BUTTONS, &button_color);
 859
 860   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
 861   GdkColor label_color = label_style->fg[GTK_STATE_NORMAL];
 862   SetThemeColorFromGtk(ThemeProperties::COLOR_TAB_TEXT, &label_color);
 863   SetThemeColorFromGtk(ThemeProperties::COLOR_BOOKMARK_TEXT, &label_color);
 864   SetThemeColorFromGtk(ThemeProperties::COLOR_STATUS_BAR_TEXT, &label_color);
 865
 866   UpdateDefaultFont(label_style->font_desc);
 867
 868   // Build the various icon tints.
 869   GetNormalButtonTintHSL(&button_tint_);
 870   GetNormalEntryForegroundHSL(&entry_tint_);
 871   GetSelectedEntryForegroundHSL(&selected_entry_tint_);
 872   GdkColor frame_color = BuildFrameColors(frame_style);
 873
 874   // The inactive frame color never occurs naturally in the theme, as it is a
 875   // tinted version of |frame_color|. We generate another color based on the
 876   // background tab color, with the lightness and saturation moved in the
 877   // opposite direction. (We don't touch the hue, since there should be subtle
 878   // hints of the color in the text.)
 879   color_utils::HSL inactive_tab_text_hsl =
 880       tints_[ThemeProperties::TINT_BACKGROUND_TAB];
 881   if (inactive_tab_text_hsl.l < 0.5)
 882     inactive_tab_text_hsl.l = kDarkInactiveLuminance;
 883   else
 884     inactive_tab_text_hsl.l = kLightInactiveLuminance;
 885
 886   if (inactive_tab_text_hsl.s < 0.5)
 887     inactive_tab_text_hsl.s = kHeavyInactiveSaturation;
 888   else
 889     inactive_tab_text_hsl.s = kLightInactiveSaturation;
 890
 891   colors_[ThemeProperties::COLOR_BACKGROUND_TAB_TEXT] =
 892       color_utils::HSLToSkColor(inactive_tab_text_hsl, 255);
 893
 894   // We pick the text and background colors for the NTP out of the colors for a
 895   // GtkEntry. We do this because GtkEntries background color is never the same
 896   // as |toolbar_color|, is usually a white, and when it isn't a white,
 897   // provides sufficient contrast to |toolbar_color|. Try this out with
 898   // Darklooks, HighContrastInverse or ThinIce.
 899   GtkStyle* entry_style = gtk_rc_get_style(fake_entry_.get());
 900   GdkColor ntp_background = entry_style->base[GTK_STATE_NORMAL];
 901   GdkColor ntp_foreground = entry_style->text[GTK_STATE_NORMAL];
 902   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_BACKGROUND,
 903                        &ntp_background);
 904   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_TEXT,
 905                        &ntp_foreground);
 906
 907   // The NTP header is the color that surrounds the current active thumbnail on
 908   // the NTP, and acts as the border of the "Recent Links" box. It would be
 909   // awesome if they were separated so we could use GetBorderColor() for the
 910   // border around the "Recent Links" section, but matching the frame color is
 911   // more important.
 912   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_HEADER,
 913                        &frame_color);
 914   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION,
 915                        &toolbar_color);
 916   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_TEXT,
 917                        &label_color);
 918
 919   // Override the link color if the theme provides it.
 920   const GdkColor* link_color = NULL;
 921   gtk_widget_style_get(GTK_WIDGET(fake_window_),
 922                        "link-color", &link_color, NULL);
 923
 924   bool is_default_link_color = false;
 925   if (!link_color) {
 926     link_color = &kDefaultLinkColor;
 927     is_default_link_color = true;
 928   }
 929
 930   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK,
 931                        link_color);
 932   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK_UNDERLINE,
 933                        link_color);
 934   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK,
 935                        link_color);
 936   SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK_UNDERLINE,
 937                        link_color);
 938
 939   if (!is_default_link_color)
 940     gdk_color_free(const_cast<GdkColor*>(link_color));
 941
 942   // Generate the colors that we pass to WebKit.
 943   focus_ring_color_ = GdkColorToSkColor(frame_color);
 944
 945   GdkColor thumb_active_color, thumb_inactive_color, track_color;
 946   Gtk2UI::GetScrollbarColors(&thumb_active_color,
 947                              &thumb_inactive_color,
 948                              &track_color);
 949   thumb_active_color_ = GdkColorToSkColor(thumb_active_color);
 950   thumb_inactive_color_ = GdkColorToSkColor(thumb_inactive_color);
 951   track_color_ = GdkColorToSkColor(track_color);
 952
 953   // Some GTK themes only define the text selection colors on the GtkEntry
 954   // class, so we need to use that for getting selection colors.
 955   active_selection_bg_color_ =
 956       GdkColorToSkColor(entry_style->base[GTK_STATE_SELECTED]);
 957   active_selection_fg_color_ =
 958       GdkColorToSkColor(entry_style->text[GTK_STATE_SELECTED]);
 959   inactive_selection_bg_color_ =
 960       GdkColorToSkColor(entry_style->base[GTK_STATE_ACTIVE]);
 961   inactive_selection_fg_color_ =
 962       GdkColorToSkColor(entry_style->text[GTK_STATE_ACTIVE]);
 963 }
 964
 965 GdkColor Gtk2UI::BuildFrameColors(GtkStyle* frame_style) {
 966   GdkColor* theme_frame = NULL;
 967   GdkColor* theme_inactive_frame = NULL;
 968   GdkColor* theme_incognito_frame = NULL;
 969   GdkColor* theme_incognito_inactive_frame = NULL;
 970   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
 971                        "frame-color", &theme_frame,
 972                        "inactive-frame-color", &theme_inactive_frame,
 973                        "incognito-frame-color", &theme_incognito_frame,
 974                        "incognito-inactive-frame-color",
 975                        &theme_incognito_inactive_frame,
 976                        NULL);
 977
 978   GdkColor frame_color = BuildAndSetFrameColor(
 979       &frame_style->bg[GTK_STATE_SELECTED],
 980       theme_frame,
 981       kDefaultFrameShift,
 982       ThemeProperties::COLOR_FRAME,
 983       ThemeProperties::TINT_FRAME);
 984   if (theme_frame)
 985     gdk_color_free(theme_frame);
 986   SetThemeTintFromGtk(ThemeProperties::TINT_BACKGROUND_TAB, &frame_color);
 987
 988   BuildAndSetFrameColor(
 989       &frame_style->bg[GTK_STATE_INSENSITIVE],
 990       theme_inactive_frame,
 991       kDefaultFrameShift,
 992       ThemeProperties::COLOR_FRAME_INACTIVE,
 993       ThemeProperties::TINT_FRAME_INACTIVE);
 994   if (theme_inactive_frame)
 995     gdk_color_free(theme_inactive_frame);
 996
 997   BuildAndSetFrameColor(
 998       &frame_color,
 999       theme_incognito_frame,
1000       GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO),
1001       ThemeProperties::COLOR_FRAME_INCOGNITO,
1002       ThemeProperties::TINT_FRAME_INCOGNITO);
1003   if (theme_incognito_frame)
1004     gdk_color_free(theme_incognito_frame);
1005
1006   BuildAndSetFrameColor(
1007       &frame_color,
1008       theme_incognito_inactive_frame,
1009       GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE),
1010       ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
1011       ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE);
1012   if (theme_incognito_inactive_frame)
1013     gdk_color_free(theme_incognito_inactive_frame);
1014
1015   return frame_color;
1016 }
1017
1018 void Gtk2UI::SetThemeColorFromGtk(int id, const GdkColor* color) {
1019   colors_[id] = GdkColorToSkColor(*color);
1020 }
1021
1022 void Gtk2UI::SetThemeTintFromGtk(int id, const GdkColor* color) {
1023   color_utils::HSL default_tint = GetDefaultTint(id);
1024   color_utils::HSL hsl;
1025   color_utils::SkColorToHSL(GdkColorToSkColor(*color), &hsl);
1026
1027   if (default_tint.s != -1)
1028     hsl.s = default_tint.s;
1029
1030   if (default_tint.l != -1)
1031     hsl.l = default_tint.l;
1032
1033   tints_[id] = hsl;
1034 }
1035
1036 GdkColor Gtk2UI::BuildAndSetFrameColor(const GdkColor* base,
1037                                        const GdkColor* gtk_base,
1038                                        const color_utils::HSL& tint,
1039                                        int color_id,
1040                                        int tint_id) {
1041   GdkColor out_color = *base;
1042   if (gtk_base) {
1043     // The theme author specified a color to use, use it without modification.
1044     out_color = *gtk_base;
1045   } else {
1046     // Tint the basic color since this is a heuristic color instead of one
1047     // specified by the theme author.
1048     GdkColorHSLShift(tint, &out_color);
1049   }
1050   SetThemeColorFromGtk(color_id, &out_color);
1051   SetThemeTintFromGtk(tint_id, &out_color);
1052
1053   return out_color;
1054 }
1055
1056 SkBitmap Gtk2UI::GenerateGtkThemeBitmap(int id) const {
1057   switch (id) {
1058     case IDR_THEME_TOOLBAR: {
1059       GtkStyle* style = gtk_rc_get_style(fake_window_);
1060       GdkColor* color = &style->bg[GTK_STATE_NORMAL];
1061       SkBitmap bitmap;
1062       bitmap.allocN32Pixels(kToolbarImageWidth, kToolbarImageHeight);
1063       bitmap.eraseARGB(0xff, color->red >> 8, color->green >> 8,
1064                        color->blue >> 8);
1065       return bitmap;
1066     }
1067     case IDR_THEME_TAB_BACKGROUND:
1068     case IDR_THEME_TAB_BACKGROUND_DESKTOP:
1069       return GenerateTabImage(IDR_THEME_FRAME);
1070     case IDR_THEME_TAB_BACKGROUND_INCOGNITO:
1071     case IDR_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP:
1072       return GenerateTabImage(IDR_THEME_FRAME_INCOGNITO);
1073     case IDR_FRAME:
1074     case IDR_THEME_FRAME:
1075       return GenerateFrameImage(ThemeProperties::COLOR_FRAME,
1076                                 "frame-gradient-color");
1077     case IDR_FRAME_INACTIVE:
1078     case IDR_THEME_FRAME_INACTIVE:
1079       return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INACTIVE,
1080                                 "inactive-frame-gradient-color");
1081     case IDR_THEME_FRAME_INCOGNITO:
1082       return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INCOGNITO,
1083                                 "incognito-frame-gradient-color");
1084     case IDR_THEME_FRAME_INCOGNITO_INACTIVE: {
1085       return GenerateFrameImage(
1086           ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
1087           "incognito-inactive-frame-gradient-color");
1088     }
1089     // Icons that sit inside the omnibox shouldn't receive TINT_BUTTONS and
1090     // instead should tint based on the foreground text entry color in GTK+
1091     // mode because some themes that try to be dark *and* light have very
1092     // different colors between the omnibox and the normal background area.
1093     // TODO(erg): Decide what to do about other icons that appear in the
1094     // omnibox, e.g. content settings icons.
1095     case IDR_OMNIBOX_EXTENSION_APP:
1096     case IDR_OMNIBOX_HTTP:
1097     case IDR_OMNIBOX_SEARCH:
1098     case IDR_OMNIBOX_STAR:
1099     case IDR_OMNIBOX_TTS: {
1100       return GenerateTintedIcon(id, entry_tint_);
1101     }
1102     // In GTK mode, the dark versions of the omnibox icons only ever appear in
1103     // the autocomplete popup and only against the current theme's GtkEntry
1104     // base[GTK_STATE_SELECTED] color, so tint the icons so they won't collide
1105     // with the selected color.
1106     case IDR_OMNIBOX_EXTENSION_APP_DARK:
1107     case IDR_OMNIBOX_HTTP_DARK:
1108     case IDR_OMNIBOX_SEARCH_DARK:
1109     case IDR_OMNIBOX_STAR_DARK:
1110     case IDR_OMNIBOX_TTS_DARK: {
1111       return GenerateTintedIcon(id, selected_entry_tint_);
1112     }
1113     // In GTK mode, we need to manually render several icons.
1114     case IDR_BACK:
1115     case IDR_BACK_D:
1116     case IDR_FORWARD:
1117     case IDR_FORWARD_D:
1118     case IDR_HOME:
1119     case IDR_RELOAD:
1120     case IDR_RELOAD_D:
1121     case IDR_STOP:
1122     case IDR_STOP_D: {
1123       return GenerateGTKIcon(id);
1124     }
1125     case IDR_TOOLBAR_BEZEL_HOVER:
1126       return GenerateToolbarBezel(GTK_STATE_PRELIGHT, IDR_TOOLBAR_BEZEL_HOVER);
1127     case IDR_TOOLBAR_BEZEL_PRESSED:
1128       return GenerateToolbarBezel(GTK_STATE_ACTIVE, IDR_TOOLBAR_BEZEL_PRESSED);
1129     default: {
1130       return GenerateTintedIcon(id, button_tint_);
1131     }
1132   }
1133
1134   return SkBitmap();
1135 }
1136
1137 SkBitmap Gtk2UI::GenerateFrameImage(
1138     int color_id,
1139     const char* gradient_name) const {
1140   // We use two colors: the main color (passed in) and a lightened version of
1141   // that color (which is supposed to match the light gradient at the top of
1142   // several GTK+ themes, such as Ambiance, Clearlooks or Bluebird).
1143   ColorMap::const_iterator it = colors_.find(color_id);
1144   DCHECK(it != colors_.end());
1145   SkColor base = it->second;
1146
1147   gfx::Canvas canvas(gfx::Size(kToolbarImageWidth, kToolbarImageHeight),
1148       1.0f, true);
1149
1150   int gradient_size;
1151   GdkColor* gradient_top_color = NULL;
1152   gtk_widget_style_get(GTK_WIDGET(fake_frame_),
1153                        "frame-gradient-size", &gradient_size,
1154                        gradient_name, &gradient_top_color,
1155                        NULL);
1156   if (gradient_size) {
1157     SkColor lighter = gradient_top_color ?
1158         GdkColorToSkColor(*gradient_top_color) :
1159         color_utils::HSLShift(base, kGtkFrameShift);
1160     skia::RefPtr<SkShader> shader = gfx::CreateGradientShader(
1161         0, gradient_size, lighter, base);
1162     SkPaint paint;
1163     paint.setStyle(SkPaint::kFill_Style);
1164     paint.setAntiAlias(true);
1165     paint.setShader(shader.get());
1166
1167     canvas.DrawRect(gfx::Rect(0, 0, kToolbarImageWidth, gradient_size), paint);
1168   }
1169
1170   if (gradient_top_color)
1171     gdk_color_free(gradient_top_color);
1172
1173   canvas.FillRect(gfx::Rect(0, gradient_size, kToolbarImageWidth,
1174                             kToolbarImageHeight - gradient_size), base);
1175   return canvas.ExtractImageRep().sk_bitmap();
1176 }
1177
1178 SkBitmap Gtk2UI::GenerateTabImage(int base_id) const {
1179   const SkBitmap* base_image = GetThemeImageNamed(base_id).ToSkBitmap();
1180   SkBitmap bg_tint = SkBitmapOperations::CreateHSLShiftedBitmap(
1181       *base_image, GetDefaultTint(ThemeProperties::TINT_BACKGROUND_TAB));
1182   return SkBitmapOperations::CreateTiledBitmap(
1183       bg_tint, 0, 0, bg_tint.width(), bg_tint.height());
1184 }
1185
1186 SkBitmap Gtk2UI::GenerateTintedIcon(
1187     int base_id,
1188     const color_utils::HSL& tint) const {
1189   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1190   return SkBitmapOperations::CreateHSLShiftedBitmap(
1191       rb.GetImageNamed(base_id).AsBitmap(), tint);
1192 }
1193
1194 SkBitmap Gtk2UI::GenerateGTKIcon(int base_id) const {
1195   const char* stock_id = NULL;
1196   GtkStateType gtk_state = GTK_STATE_NORMAL;
1197   for (unsigned int i = 0; i < arraysize(kGtkIcons); ++i) {
1198     if (kGtkIcons[i].idr == base_id) {
1199       stock_id = kGtkIcons[i].stock_id;
1200       gtk_state = kGtkIcons[i].gtk_state;
1201       break;
1202     }
1203   }
1204   DCHECK(stock_id);
1205
1206   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1207   SkBitmap default_bitmap = rb.GetImageNamed(base_id).AsBitmap();
1208
1209   gtk_widget_ensure_style(fake_frame_);
1210   GtkStyle* style = gtk_widget_get_style(fake_frame_);
1211   GtkIconSet* icon_set = gtk_style_lookup_icon_set(style, stock_id);
1212   if (!icon_set)
1213     return default_bitmap;
1214
1215   // Ask GTK to render the icon to a buffer, which we will steal from.
1216   GdkPixbuf* gdk_icon = gtk_icon_set_render_icon(
1217       icon_set,
1218       style,
1219       base::i18n::IsRTL() ? GTK_TEXT_DIR_RTL : GTK_TEXT_DIR_LTR,
1220       gtk_state,
1221       GTK_ICON_SIZE_SMALL_TOOLBAR,
1222       fake_frame_,
1223       NULL);
1224
1225   if (!gdk_icon) {
1226     // This can theoretically happen if an icon theme doesn't provide a
1227     // specific image. This should realistically never happen, but I bet there
1228     // are some theme authors who don't reliably provide all icons.
1229     return default_bitmap;
1230   }
1231
1232   SkBitmap retval;
1233   retval.allocN32Pixels(default_bitmap.width(), default_bitmap.height());
1234   retval.eraseColor(0);
1235
1236   const SkBitmap icon = GdkPixbufToImageSkia(gdk_icon);
1237   g_object_unref(gdk_icon);
1238
1239   SkCanvas canvas(retval);
1240
1241   if (gtk_state == GTK_STATE_ACTIVE || gtk_state == GTK_STATE_PRELIGHT) {
1242     SkBitmap border = DrawGtkButtonBorder(gtk_state,
1243                                           false,
1244                                           false,
1245                                           default_bitmap.width(),
1246                                           default_bitmap.height());
1247     canvas.drawBitmap(border, 0, 0);
1248   }
1249
1250   canvas.drawBitmap(icon,
1251                     (default_bitmap.width() / 2) - (icon.width() / 2),
1252                     (default_bitmap.height() / 2) - (icon.height() / 2));
1253
1254   return retval;
1255 }
1256
1257 SkBitmap Gtk2UI::GenerateToolbarBezel(int gtk_state, int sizing_idr) const {
1258   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
1259   SkBitmap default_bitmap =
1260       rb.GetImageNamed(sizing_idr).AsBitmap();
1261
1262   SkBitmap retval;
1263   retval.allocN32Pixels(default_bitmap.width(), default_bitmap.height());
1264   retval.eraseColor(0);
1265
1266   SkCanvas canvas(retval);
1267   SkBitmap border = DrawGtkButtonBorder(
1268       gtk_state,
1269       false,
1270       false,
1271       default_bitmap.width(),
1272       default_bitmap.height());
1273   canvas.drawBitmap(border, 0, 0);
1274
1275   return retval;
1276 }
1277
1278 void Gtk2UI::GetNormalButtonTintHSL(color_utils::HSL* tint) const {
1279   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
1280   const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];
1281   const GdkColor base_color = window_style->base[GTK_STATE_NORMAL];
1282
1283   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
1284   const GdkColor text_color = label_style->fg[GTK_STATE_NORMAL];
1285
1286   PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
1287 }
1288
1289 void Gtk2UI::GetNormalEntryForegroundHSL(color_utils::HSL* tint) const {
1290   GtkStyle* window_style = gtk_rc_get_style(fake_window_);
1291   const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];
1292
1293   GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
1294   const GdkColor text_color = style->text[GTK_STATE_NORMAL];
1295   const GdkColor base_color = style->base[GTK_STATE_NORMAL];
1296
1297   PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
1298 }
1299
1300 void Gtk2UI::GetSelectedEntryForegroundHSL(color_utils::HSL* tint) const {
1301   // The simplest of all the tints. We just use the selected text in the entry
1302   // since the icons tinted this way will only be displayed against
1303   // base[GTK_STATE_SELECTED].
1304   GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
1305   const GdkColor color = style->text[GTK_STATE_SELECTED];
1306   color_utils::SkColorToHSL(GdkColorToSkColor(color), tint);
1307 }
1308
1309 SkBitmap Gtk2UI::DrawGtkButtonBorder(int gtk_state,
1310                                      bool focused,
1311                                      bool call_to_action,
1312                                      int width,
1313                                      int height) const {
1314   // Create a temporary GTK button to snapshot
1315   GtkWidget* window = gtk_offscreen_window_new();
1316   GtkWidget* button = gtk_button_new();
1317   gtk_widget_set_size_request(button, width, height);
1318   gtk_container_add(GTK_CONTAINER(window), button);
1319   gtk_widget_realize(window);
1320   gtk_widget_realize(button);
1321   gtk_widget_show(button);
1322   gtk_widget_show(window);
1323
1324   if (call_to_action)
1325     GTK_WIDGET_SET_FLAGS(button, GTK_HAS_DEFAULT);
1326
1327   if (focused) {
1328     // We can't just use gtk_widget_grab_focus() here because that sets
1329     // gtk_widget_is_focus(), but not gtk_widget_has_focus(), which is what the
1330     // GtkButton's paint checks.
1331     GTK_WIDGET_SET_FLAGS(button, GTK_HAS_FOCUS);
1332   }
1333
1334   gtk_widget_set_state(button, static_cast<GtkStateType>(gtk_state));
1335
1336   GdkPixmap* pixmap;
1337   {
1338     // http://crbug.com/346740
1339     ANNOTATE_SCOPED_MEMORY_LEAK;
1340     pixmap = gtk_widget_get_snapshot(button, NULL);
1341   }
1342   int w, h;
1343   gdk_drawable_get_size(GDK_DRAWABLE(pixmap), &w, &h);
1344   DCHECK_EQ(w, width);
1345   DCHECK_EQ(h, height);
1346
1347   // We render the Pixmap to a Pixbuf. This can be slow, as we're scrapping
1348   // bits from X.
1349   GdkColormap* colormap = gdk_drawable_get_colormap(pixmap);
1350   GdkPixbuf* pixbuf = gdk_pixbuf_get_from_drawable(NULL,
1351                                                    GDK_DRAWABLE(pixmap),
1352                                                    colormap,
1353                                                    0, 0, 0, 0, w, h);
1354
1355   // Finally, we convert our pixbuf into a type we can use.
1356   SkBitmap border = GdkPixbufToImageSkia(pixbuf);
1357   g_object_unref(pixbuf);
1358   g_object_unref(pixmap);
1359   gtk_widget_destroy(window);
1360
1361   return border;
1362 }
1363
1364 void Gtk2UI::ClearAllThemeData() {
1365   gtk_images_.clear();
1366 }
1367
1368 void Gtk2UI::UpdateDefaultFont(const PangoFontDescription* desc) {
1369   // Use gfx::FontRenderParams to select a family and determine the rendering
1370   // settings.
1371   gfx::FontRenderParamsQuery query(false /* for_web_contents */);
1372   base::SplitString(pango_font_description_get_family(desc), ',',
1373                     &query.families);
1374
1375   if (pango_font_description_get_size_is_absolute(desc)) {
1376     // If the size is absolute, it's specified in Pango units. There are
1377     // PANGO_SCALE Pango units in a device unit (pixel).
1378     const int size_pixels = pango_font_description_get_size(desc) / PANGO_SCALE;
1379     default_font_size_pixels_ = size_pixels;
1380     query.pixel_size = size_pixels;
1381   } else {
1382     // Non-absolute sizes are in points (again scaled by PANGO_SIZE).
1383     // Round the value when converting to pixels to match GTK's logic.
1384     const double size_points = pango_font_description_get_size(desc) /
1385         static_cast<double>(PANGO_SCALE);
1386     default_font_size_pixels_ = static_cast<int>(
1387         GetPixelsInPoint() * size_points + 0.5);
1388     query.point_size = static_cast<int>(size_points);
1389   }
1390
1391   query.style = gfx::Font::NORMAL;
1392   // TODO(davemoore): Support weights other than bold?
1393   if (pango_font_description_get_weight(desc) == PANGO_WEIGHT_BOLD)
1394     query.style |= gfx::Font::BOLD;
1395   // TODO(davemoore): What about PANGO_STYLE_OBLIQUE?
1396   if (pango_font_description_get_style(desc) == PANGO_STYLE_ITALIC)
1397     query.style |= gfx::Font::ITALIC;
1398
1399   default_font_render_params_ =
1400       gfx::GetFontRenderParams(query, &default_font_family_);
1401   default_font_style_ = query.style;
1402 }
1403
1404 void Gtk2UI::OnStyleSet(GtkWidget* widget, GtkStyle* previous_style) {
1405   ClearAllThemeData();
1406   LoadGtkValues();
1407   NativeThemeGtk2::instance()->NotifyObservers();
1408 }
1409
1410 }  // namespace libgtk2ui
1411
1412 views::LinuxUI* BuildGtk2UI() {
1413   return new libgtk2ui::Gtk2UI;
1414 }