chrome/browser/ui/libgtk2ui/gtk2

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This source file includes following definitions.
IsOverridableImage
PickButtonTintFromColors
GdkColorHSLShift
GetDefaultTint
Initialize
GetThemeImageNamed
GetColor
HasCustomImage
GetFocusRingColor
GetThumbActiveColor
GetThumbInactiveColor
GetTrackColor
GetActiveSelectionBgColor
GetActiveSelectionFgColor
GetInactiveSelectionBgColor
GetInactiveSelectionFgColor
GetCursorBlinkInterval
GetNativeTheme
GetDefaultUsesSystemTheme
SetDownloadCount
SetProgressFraction
IsStatusIconSupported
CreateLinuxStatusIcon
GetIconForContentType
CreateNativeBorder
AddWindowButtonOrderObserver
RemoveWindowButtonOrderObserver
SetWindowButtonOrdering
CreateInputMethodContext
UseAntialiasing
GetHintingStyle
GetSubpixelRenderingStyle
GetDefaultFontName
CreateSelectFileDialog
AddNativeThemeChangeObserver
RemoveNativeThemeChangeObserver
UnityIsRunning
NotifyWindowManagerStartupComplete
MatchEvent
GetScrollbarColors
SetXDGIconTheme
LoadGtkValues
BuildFrameColors
SetThemeColorFromGtk
SetThemeTintFromGtk
BuildAndSetFrameColor
GenerateGtkThemeBitmap
GenerateFrameImage
GenerateTabImage
GenerateTintedIcon
GenerateGTKIcon
GenerateToolbarBezel
GetNormalButtonTintHSL
GetNormalEntryForegroundHSL
GetSelectedEntryForegroundHSL
DrawGtkButtonBorder
GetButtonInsets
UpdateButtonInsets
ClearAllThemeData
OnStyleSet
BuildGtk2UI
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/libgtk2ui/gtk2_ui.h"

#include <set>

#include "base/command_line.h"
#include "base/debug/leak_annotations.h"
#include "base/environment.h"
#include "base/i18n/rtl.h"
#include "base/logging.h"
#include "base/nix/mime_util_xdg.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/themes/theme_properties.h"
#include "chrome/browser/ui/libgtk2ui/app_indicator_icon.h"
#include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
#include "chrome/browser/ui/libgtk2ui/gtk2_border.h"
#include "chrome/browser/ui/libgtk2ui/gtk2_key_bindings_handler.h"
#include "chrome/browser/ui/libgtk2ui/gtk2_signal_registrar.h"
#include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
#include "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
#include "chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h"
#include "chrome/browser/ui/libgtk2ui/printing_gtk2_util.h"
#include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
#include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
#include "chrome/browser/ui/libgtk2ui/unity_service.h"
#include "chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h"
#include "grit/theme_resources.h"
#include "grit/ui_resources.h"
#include "printing/printing_context_linux.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/size.h"
#include "ui/gfx/skbitmap_operations.h"
#include "ui/gfx/skia_util.h"
#include "ui/views/linux_ui/window_button_order_observer.h"

#if defined(USE_GCONF)
#include "chrome/browser/ui/libgtk2ui/gconf_titlebar_listener.h"
#endif

// A minimized port of GtkThemeService into something that can provide colors
// and images for aura.
//
// TODO(erg): There's still a lot that needs ported or done for the first time:
//
// - Render and inject the omnibox background.
// - Make sure to test with a light on dark theme, too.

namespace {

struct GObjectDeleter {
  void operator()(void* ptr) {
    g_object_unref(ptr);
  }
};
struct GtkIconInfoDeleter {
  void operator()(GtkIconInfo* ptr) {
    gtk_icon_info_free(ptr);
  }
};
typedef scoped_ptr<GIcon, GObjectDeleter> ScopedGIcon;
typedef scoped_ptr<GtkIconInfo, GtkIconInfoDeleter> ScopedGtkIconInfo;
typedef scoped_ptr<GdkPixbuf, GObjectDeleter> ScopedGdkPixbuf;

// Prefix for app indicator ids
const char kAppIndicatorIdPrefix[] = "chrome_app_indicator_";

// Number of app indicators used (used as part of app-indicator id).
int indicators_count;

// The unknown content type.
const char* kUnknownContentType = "application/octet-stream";

// The size of the rendered toolbar image.
const int kToolbarImageWidth = 64;
const int kToolbarImageHeight = 128;

// How much to tint the GTK+ color lighter at the top of the window.
const color_utils::HSL kGtkFrameShift = { -1, -1, 0.58 };

// How much to tint the GTK+ color when an explicit frame color hasn't been
// specified.
const color_utils::HSL kDefaultFrameShift = { -1, -1, 0.4 };

// Values used as the new luminance and saturation values in the inactive tab
// text color.
const double kDarkInactiveLuminance = 0.85;
const double kLightInactiveLuminance = 0.15;
const double kHeavyInactiveSaturation = 0.7;
const double kLightInactiveSaturation = 0.3;

// Default color for links on the NTP when the GTK+ theme doesn't define a
// link color. Constant taken from gtklinkbutton.c.
const GdkColor kDefaultLinkColor = { 0, 0, 0, 0xeeee };

const int kSkiaToGDKMultiplier = 257;

// TODO(erg): ThemeService has a whole interface just for reading default
// constants. Figure out what to do with that more long term; for now, just
// copy the constants themselves here.
//
// Default tints.
const color_utils::HSL kDefaultTintButtons = { -1, -1, -1 };
const color_utils::HSL kDefaultTintFrame = { -1, -1, -1 };
const color_utils::HSL kDefaultTintFrameInactive = { -1, -1, 0.75f };
const color_utils::HSL kDefaultTintFrameIncognito = { -1, 0.2f, 0.35f };
const color_utils::HSL kDefaultTintFrameIncognitoInactive = { -1, 0.3f, 0.6f };
const color_utils::HSL kDefaultTintBackgroundTab = { -1, 0.5, 0.75 };

// A list of images that we provide while in gtk mode.
const int kThemeImages[] = {
  IDR_THEME_TOOLBAR,
  IDR_THEME_TAB_BACKGROUND,
  IDR_THEME_TAB_BACKGROUND_INCOGNITO,
  IDR_FRAME,
  IDR_FRAME_INACTIVE,
  IDR_THEME_FRAME,
  IDR_THEME_FRAME_INACTIVE,
  IDR_THEME_FRAME_INCOGNITO,
  IDR_THEME_FRAME_INCOGNITO_INACTIVE,
};

// A list of icons used in the autocomplete view that should be tinted to the
// current gtk theme selection color so they stand out against the GtkEntry's
// base color.
// TODO(erg): Decide what to do about other icons that appear in the omnibox,
// e.g. content settings icons.
const int kAutocompleteImages[] = {
  IDR_OMNIBOX_EXTENSION_APP,
  IDR_OMNIBOX_HTTP,
  IDR_OMNIBOX_HTTP_DARK,
  IDR_OMNIBOX_SEARCH,
  IDR_OMNIBOX_SEARCH_DARK,
  IDR_OMNIBOX_STAR,
  IDR_OMNIBOX_STAR_DARK,
  IDR_OMNIBOX_TTS,
  IDR_OMNIBOX_TTS_DARK,
};

// This table converts button ids into a pair of gtk-stock id and state.
struct IDRGtkMapping {
  int idr;
  const char* stock_id;
  GtkStateType gtk_state;
} const kGtkIcons[] = {
  { IDR_BACK,      GTK_STOCK_GO_BACK,    GTK_STATE_NORMAL },
  { IDR_BACK_D,    GTK_STOCK_GO_BACK,    GTK_STATE_INSENSITIVE },
  { IDR_BACK_H,    GTK_STOCK_GO_BACK,    GTK_STATE_PRELIGHT },
  { IDR_BACK_P,    GTK_STOCK_GO_BACK,    GTK_STATE_ACTIVE },

  { IDR_FORWARD,   GTK_STOCK_GO_FORWARD, GTK_STATE_NORMAL },
  { IDR_FORWARD_D, GTK_STOCK_GO_FORWARD, GTK_STATE_INSENSITIVE },
  { IDR_FORWARD_H, GTK_STOCK_GO_FORWARD, GTK_STATE_PRELIGHT },
  { IDR_FORWARD_P, GTK_STOCK_GO_FORWARD, GTK_STATE_ACTIVE },

  { IDR_HOME,      GTK_STOCK_HOME,       GTK_STATE_NORMAL },
  { IDR_HOME_H,    GTK_STOCK_HOME,       GTK_STATE_PRELIGHT },
  { IDR_HOME_P,    GTK_STOCK_HOME,       GTK_STATE_ACTIVE },

  { IDR_RELOAD,    GTK_STOCK_REFRESH,    GTK_STATE_NORMAL },
  { IDR_RELOAD_D,  GTK_STOCK_REFRESH,    GTK_STATE_INSENSITIVE },
  { IDR_RELOAD_H,  GTK_STOCK_REFRESH,    GTK_STATE_PRELIGHT },
  { IDR_RELOAD_P,  GTK_STOCK_REFRESH,    GTK_STATE_ACTIVE },

  { IDR_STOP,      GTK_STOCK_STOP,       GTK_STATE_NORMAL },
  { IDR_STOP_D,    GTK_STOCK_STOP,       GTK_STATE_INSENSITIVE },
  { IDR_STOP_H,    GTK_STOCK_STOP,       GTK_STATE_PRELIGHT },
  { IDR_STOP_P,    GTK_STOCK_STOP,       GTK_STATE_ACTIVE },
};

// The image resources that will be tinted by the 'button' tint value.
const int kOtherToolbarButtonIDs[] = {
  IDR_TOOLBAR_BEZEL_HOVER,
  IDR_TOOLBAR_BEZEL_PRESSED,
  IDR_BROWSER_ACTION_H,
  IDR_BROWSER_ACTION_P,
  IDR_BROWSER_ACTIONS_OVERFLOW,
  IDR_BROWSER_ACTIONS_OVERFLOW_H,
  IDR_BROWSER_ACTIONS_OVERFLOW_P,
  IDR_THROBBER,
  IDR_THROBBER_WAITING,
  IDR_THROBBER_LIGHT,

  // TODO(erg): The dropdown arrow should be tinted because we're injecting
  // various background GTK colors, but the code that accesses them needs to be
  // modified so that they ask their ui::ThemeProvider instead of the
  // ResourceBundle. (i.e. in a light on dark theme, the dropdown arrow will be
  // dark on dark)
  IDR_MENU_DROPARROW
};

bool IsOverridableImage(int id) {
  CR_DEFINE_STATIC_LOCAL(std::set<int>, images, ());
  if (images.empty()) {
    images.insert(kThemeImages, kThemeImages + arraysize(kThemeImages));
    images.insert(kAutocompleteImages,
                  kAutocompleteImages + arraysize(kAutocompleteImages));

    for (unsigned int i = 0; i < arraysize(kGtkIcons); ++i)
      images.insert(kGtkIcons[i].idr);

    images.insert(kOtherToolbarButtonIDs,
                  kOtherToolbarButtonIDs + arraysize(kOtherToolbarButtonIDs));
  }

  return images.count(id) > 0;
}

// Picks a button tint from a set of background colors. While
// |accent_gdk_color| will usually be the same color through a theme, this
// function will get called with the normal GtkLabel |text_color|/GtkWindow
// |background_color| pair and the GtkEntry |text_color|/|background_color|
// pair. While 3/4 of the time the resulting tint will be the same, themes that
// have a dark window background (with light text) and a light text entry (with
// dark text) will get better icons with this separated out.
void PickButtonTintFromColors(const GdkColor& accent_gdk_color,
                              const GdkColor& text_color,
                              const GdkColor& background_color,
                              color_utils::HSL* tint) {
  SkColor accent_color = libgtk2ui::GdkColorToSkColor(accent_gdk_color);
  color_utils::HSL accent_tint;
  color_utils::SkColorToHSL(accent_color, &accent_tint);

  color_utils::HSL text_tint;
  color_utils::SkColorToHSL(libgtk2ui::GdkColorToSkColor(text_color),
                            &text_tint);

  color_utils::HSL background_tint;
  color_utils::SkColorToHSL(libgtk2ui::GdkColorToSkColor(background_color),
                            &background_tint);

  // If the accent color is gray, then our normal HSL tomfoolery will bring out
  // whatever color is oddly dominant (for example, in rgb space [125, 128,
  // 125] will tint green instead of gray). Slight differences (+/-10 (4%) to
  // all color components) should be interpreted as this color being gray and
  // we should switch into a special grayscale mode.
  int rb_diff = abs(SkColorGetR(accent_color) - SkColorGetB(accent_color));
  int rg_diff = abs(SkColorGetR(accent_color) - SkColorGetG(accent_color));
  int bg_diff = abs(SkColorGetB(accent_color) - SkColorGetG(accent_color));
  if (rb_diff < 10 && rg_diff < 10 && bg_diff < 10) {
    // Our accent is white/gray/black. Only the luminance of the accent color
    // matters.
    tint->h = -1;

    // Use the saturation of the text.
    tint->s = text_tint.s;

    // Use the luminance of the accent color UNLESS there isn't enough
    // luminance contrast between the accent color and the base color.
    if (fabs(accent_tint.l - background_tint.l) > 0.3)
      tint->l = accent_tint.l;
    else
      tint->l = text_tint.l;
  } else {
    // Our accent is a color.
    tint->h = accent_tint.h;

    // Don't modify the saturation; the amount of color doesn't matter.
    tint->s = -1;

    // If the text wants us to darken the icon, don't change the luminance (the
    // icons are already dark enough). Otherwise, lighten the icon by no more
    // than 0.9 since we don't want a pure-white icon even if the text is pure
    // white.
    if (text_tint.l < 0.5)
      tint->l = -1;
    else if (text_tint.l <= 0.9)
      tint->l = text_tint.l;
    else
      tint->l = 0.9;
  }
}

// Applies an HSL shift to a GdkColor (instead of an SkColor)
void GdkColorHSLShift(const color_utils::HSL& shift, GdkColor* frame_color) {
  SkColor shifted = color_utils::HSLShift(
      libgtk2ui::GdkColorToSkColor(*frame_color), shift);

  frame_color->pixel = 0;
  frame_color->red = SkColorGetR(shifted) * kSkiaToGDKMultiplier;
  frame_color->green = SkColorGetG(shifted) * kSkiaToGDKMultiplier;
  frame_color->blue = SkColorGetB(shifted) * kSkiaToGDKMultiplier;
}

// Copied Default blah sections from ThemeService.
color_utils::HSL GetDefaultTint(int id) {
  switch (id) {
    case ThemeProperties::TINT_FRAME:
      return kDefaultTintFrame;
    case ThemeProperties::TINT_FRAME_INACTIVE:
      return kDefaultTintFrameInactive;
    case ThemeProperties::TINT_FRAME_INCOGNITO:
      return kDefaultTintFrameIncognito;
    case ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE:
      return kDefaultTintFrameIncognitoInactive;
    case ThemeProperties::TINT_BUTTONS:
      return kDefaultTintButtons;
    case ThemeProperties::TINT_BACKGROUND_TAB:
      return kDefaultTintBackgroundTab;
    default:
      color_utils::HSL result = {-1, -1, -1};
      return result;
  }
}

}  // namespace

namespace libgtk2ui {

Gtk2UI::Gtk2UI() {
  GtkInitFromCommandLine(*CommandLine::ForCurrentProcess());
}

void Gtk2UI::Initialize() {
  signals_.reset(new Gtk2SignalRegistrar);

  // Create our fake widgets.
  fake_window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  fake_frame_ = chrome_gtk_frame_new();
  fake_label_.Own(gtk_label_new(""));
  fake_entry_.Own(gtk_entry_new());

  // Only realized widgets receive style-set notifications, which we need to
  // broadcast new theme images and colors. Only realized widgets have style
  // properties, too, which we query for some colors.
  gtk_widget_realize(fake_frame_);
  gtk_widget_realize(fake_window_);

  signals_->Connect(fake_frame_, "style-set",
                    G_CALLBACK(&OnStyleSetThunk), this);

  LoadGtkValues();
  SetXDGIconTheme();

  printing::PrintingContextLinux::SetCreatePrintDialogFunction(
      &PrintDialogGtk2::CreatePrintDialog);
  printing::PrintingContextLinux::SetPdfPaperSizeFunction(
      &GetPdfPaperSizeDeviceUnitsGtk);

#if defined(USE_GCONF)
  // We must build this after GTK gets initialized.
  titlebar_listener_.reset(new GConfTitlebarListener(this));
#endif  // defined(USE_GCONF)

  indicators_count = 0;
}

Gtk2UI::~Gtk2UI() {
  gtk_widget_destroy(fake_window_);
  gtk_widget_destroy(fake_frame_);
  fake_label_.Destroy();
  fake_entry_.Destroy();

  ClearAllThemeData();
}

gfx::Image Gtk2UI::GetThemeImageNamed(int id) const {
  // Try to get our cached version:
  ImageCache::const_iterator it = gtk_images_.find(id);
  if (it != gtk_images_.end())
    return it->second;

  if (IsOverridableImage(id)) {
    gfx::Image image = gfx::Image(
        gfx::ImageSkia::CreateFrom1xBitmap(GenerateGtkThemeBitmap(id)));
    gtk_images_[id] = image;
    return image;
  }

  return gfx::Image();
}

bool Gtk2UI::GetColor(int id, SkColor* color) const {
  ColorMap::const_iterator it = colors_.find(id);
  if (it != colors_.end()) {
    *color = it->second;
    return true;
  }

  return false;
}

bool Gtk2UI::HasCustomImage(int id) const {
  return IsOverridableImage(id);
}

SkColor Gtk2UI::GetFocusRingColor() const {
  return focus_ring_color_;
}

SkColor Gtk2UI::GetThumbActiveColor() const {
  return thumb_active_color_;
}

SkColor Gtk2UI::GetThumbInactiveColor() const {
  return thumb_inactive_color_;
}

SkColor Gtk2UI::GetTrackColor() const {
  return track_color_;
}

SkColor Gtk2UI::GetActiveSelectionBgColor() const {
  return active_selection_bg_color_;
}

SkColor Gtk2UI::GetActiveSelectionFgColor() const {
  return active_selection_fg_color_;
}

SkColor Gtk2UI::GetInactiveSelectionBgColor() const {
  return inactive_selection_bg_color_;
}

SkColor Gtk2UI::GetInactiveSelectionFgColor() const {
  return inactive_selection_fg_color_;
}

double Gtk2UI::GetCursorBlinkInterval() const {
  // From http://library.gnome.org/devel/gtk/unstable/GtkSettings.html, this is
  // the default value for gtk-cursor-blink-time.
  static const gint kGtkDefaultCursorBlinkTime = 1200;

  // Dividing GTK's cursor blink cycle time (in milliseconds) by this value
  // yields an appropriate value for
  // content::RendererPreferences::caret_blink_interval.  This matches the
  // logic in the WebKit GTK port.
  static const double kGtkCursorBlinkCycleFactor = 2000.0;

  gint cursor_blink_time = kGtkDefaultCursorBlinkTime;
  gboolean cursor_blink = TRUE;
  g_object_get(gtk_settings_get_default(),
               "gtk-cursor-blink-time", &cursor_blink_time,
               "gtk-cursor-blink", &cursor_blink,
               NULL);
  return cursor_blink ? (cursor_blink_time / kGtkCursorBlinkCycleFactor) : 0.0;
}

ui::NativeTheme* Gtk2UI::GetNativeTheme() const {
  return NativeThemeGtk2::instance();
}

bool Gtk2UI::GetDefaultUsesSystemTheme() const {
  scoped_ptr<base::Environment> env(base::Environment::Create());

  switch (base::nix::GetDesktopEnvironment(env.get())) {
    case base::nix::DESKTOP_ENVIRONMENT_GNOME:
    case base::nix::DESKTOP_ENVIRONMENT_UNITY:
    case base::nix::DESKTOP_ENVIRONMENT_XFCE:
      return true;
    case base::nix::DESKTOP_ENVIRONMENT_KDE3:
    case base::nix::DESKTOP_ENVIRONMENT_KDE4:
    case base::nix::DESKTOP_ENVIRONMENT_OTHER:
      return false;
  }
  // Unless GetDesktopEnvironment() badly misbehaves, this should never happen.
  NOTREACHED();
  return false;
}

void Gtk2UI::SetDownloadCount(int count) const {
  if (unity::IsRunning())
    unity::SetDownloadCount(count);
}

void Gtk2UI::SetProgressFraction(float percentage) const {
  if (unity::IsRunning())
    unity::SetProgressFraction(percentage);
}

bool Gtk2UI::IsStatusIconSupported() const {
  return AppIndicatorIcon::CouldOpen();
}

scoped_ptr<views::StatusIconLinux> Gtk2UI::CreateLinuxStatusIcon(
    const gfx::ImageSkia& image,
    const base::string16& tool_tip) const {
  if (AppIndicatorIcon::CouldOpen()) {
    ++indicators_count;
    return scoped_ptr<views::StatusIconLinux>(new AppIndicatorIcon(
        base::StringPrintf("%s%d", kAppIndicatorIdPrefix, indicators_count),
        image,
        tool_tip));
  } else {
    return scoped_ptr<views::StatusIconLinux>();
  }
}

gfx::Image Gtk2UI::GetIconForContentType(
    const std::string& content_type,
    int size) const {
  // This call doesn't take a reference.
  GtkIconTheme* theme = gtk_icon_theme_get_default();

  std::string content_types[] = {
    content_type, kUnknownContentType
  };

  for (size_t i = 0; i < arraysize(content_types); ++i) {
    ScopedGIcon icon(g_content_type_get_icon(content_types[i].c_str()));
    ScopedGtkIconInfo icon_info(
        gtk_icon_theme_lookup_by_gicon(
            theme, icon.get(), size,
            static_cast<GtkIconLookupFlags>(GTK_ICON_LOOKUP_FORCE_SIZE)));
    if (!icon_info)
      continue;
    ScopedGdkPixbuf pixbuf(gtk_icon_info_load_icon(icon_info.get(), NULL));
    if (!pixbuf)
      continue;

    SkBitmap bitmap = GdkPixbufToImageSkia(pixbuf.get());
    DCHECK_EQ(size, bitmap.width());
    DCHECK_EQ(size, bitmap.height());
    gfx::ImageSkia image_skia = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
    image_skia.MakeThreadSafe();
    return gfx::Image(image_skia);
  }
  return gfx::Image();
}

scoped_ptr<views::Border> Gtk2UI::CreateNativeBorder(
    views::LabelButton* owning_button,
    scoped_ptr<views::Border> border) {
  return scoped_ptr<views::Border>(
      new Gtk2Border(this, owning_button, border.Pass()));
}

void Gtk2UI::AddWindowButtonOrderObserver(
    views::WindowButtonOrderObserver* observer) {
  if (!leading_buttons_.empty() || !trailing_buttons_.empty()) {
    observer->OnWindowButtonOrderingChange(leading_buttons_,
                                           trailing_buttons_);
  }

  observer_list_.AddObserver(observer);
}

void Gtk2UI::RemoveWindowButtonOrderObserver(
    views::WindowButtonOrderObserver* observer) {
  observer_list_.RemoveObserver(observer);
}

void Gtk2UI::SetWindowButtonOrdering(
    const std::vector<views::FrameButton>& leading_buttons,
    const std::vector<views::FrameButton>& trailing_buttons) {
  leading_buttons_ = leading_buttons;
  trailing_buttons_ = trailing_buttons;

  FOR_EACH_OBSERVER(views::WindowButtonOrderObserver, observer_list_,
                    OnWindowButtonOrderingChange(leading_buttons_,
                                                 trailing_buttons_));
}

scoped_ptr<ui::LinuxInputMethodContext> Gtk2UI::CreateInputMethodContext(
    ui::LinuxInputMethodContextDelegate* delegate) const {
  return scoped_ptr<ui::LinuxInputMethodContext>(
      new X11InputMethodContextImplGtk2(delegate));
}

bool Gtk2UI::UseAntialiasing() const {
  GtkSettings* gtk_settings = gtk_settings_get_default();
  CHECK(gtk_settings);
  gint gtk_antialias = 0;
  g_object_get(gtk_settings,
               "gtk-xft-antialias", &gtk_antialias,
               NULL);
  return gtk_antialias != 0;
}

gfx::FontRenderParams::Hinting Gtk2UI::GetHintingStyle() const {
  GtkSettings* gtk_settings = gtk_settings_get_default();
  CHECK(gtk_settings);
  gfx::FontRenderParams::Hinting hinting =
      gfx::FontRenderParams::HINTING_SLIGHT;
  gint gtk_hinting = 0;
  gchar* gtk_hint_style = NULL;
  g_object_get(gtk_settings,
               "gtk-xft-hinting", &gtk_hinting,
               "gtk-xft-hintstyle", &gtk_hint_style,
               NULL);

  if (gtk_hint_style) {
    if (gtk_hinting == 0 || strcmp(gtk_hint_style, "hintnone") == 0)
      hinting = gfx::FontRenderParams::HINTING_NONE;
    else if (strcmp(gtk_hint_style, "hintslight") == 0)
      hinting = gfx::FontRenderParams::HINTING_SLIGHT;
    else if (strcmp(gtk_hint_style, "hintmedium") == 0)
      hinting = gfx::FontRenderParams::HINTING_MEDIUM;
    else if (strcmp(gtk_hint_style, "hintfull") == 0)
      hinting = gfx::FontRenderParams::HINTING_FULL;

    g_free(gtk_hint_style);
  }

  return hinting;
}

gfx::FontRenderParams::SubpixelRendering
Gtk2UI::GetSubpixelRenderingStyle() const {
  GtkSettings* gtk_settings = gtk_settings_get_default();
  CHECK(gtk_settings);
  gfx::FontRenderParams::SubpixelRendering subpixel_rendering =
      gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE;
  gchar* gtk_rgba = NULL;
  g_object_get(gtk_settings,
               "gtk-xft-rgba", &gtk_rgba,
               NULL);

  if (gtk_rgba) {
    if (strcmp(gtk_rgba, "none") == 0)
      subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE;
    else if (strcmp(gtk_rgba, "rgb") == 0)
      subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_RGB;
    else if (strcmp(gtk_rgba, "bgr") == 0)
      subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_BGR;
    else if (strcmp(gtk_rgba, "vrgb") == 0)
      subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_VRGB;
    else if (strcmp(gtk_rgba, "vbgr") == 0)
      subpixel_rendering = gfx::FontRenderParams::SUBPIXEL_RENDERING_VBGR;

    g_free(gtk_rgba);
  }

  return subpixel_rendering;
}

std::string Gtk2UI::GetDefaultFontName() const {
  GtkSettings* gtk_settings = gtk_settings_get_default();
  CHECK(gtk_settings);

  std::string out_font_name = "sans 10";
  gchar* font_name = NULL;
  g_object_get(gtk_settings, "gtk-font-name", &font_name, NULL);

  if (font_name) {
    out_font_name = std::string(font_name);
    g_free(font_name);
  }

  return out_font_name;
}

ui::SelectFileDialog* Gtk2UI::CreateSelectFileDialog(
    ui::SelectFileDialog::Listener* listener,
    ui::SelectFilePolicy* policy) const {
  return SelectFileDialogImpl::Create(listener, policy);
}

void Gtk2UI::AddNativeThemeChangeObserver(
    views::NativeThemeChangeObserver* observer) {
  theme_change_observers_.AddObserver(observer);
}

void Gtk2UI::RemoveNativeThemeChangeObserver(
    views::NativeThemeChangeObserver* observer) {
  theme_change_observers_.RemoveObserver(observer);
}

bool Gtk2UI::UnityIsRunning() {
  return unity::IsRunning();
}

void Gtk2UI::NotifyWindowManagerStartupComplete() {
  // TODO(port) Implement this using _NET_STARTUP_INFO_BEGIN/_NET_STARTUP_INFO
  // from http://standards.freedesktop.org/startup-notification-spec/ instead.
  gdk_notify_startup_complete();
}

bool Gtk2UI::MatchEvent(const ui::Event& event,
                        std::vector<ui::TextEditCommandX11>* commands) {
  // Ensure that we have a keyboard handler.
  if (!key_bindings_handler_)
    key_bindings_handler_.reset(new Gtk2KeyBindingsHandler);

  return key_bindings_handler_->MatchEvent(event, commands);
}

void Gtk2UI::GetScrollbarColors(GdkColor* thumb_active_color,
                                GdkColor* thumb_inactive_color,
                                GdkColor* track_color) {
  GdkColor* theme_thumb_active = NULL;
  GdkColor* theme_thumb_inactive = NULL;
  GdkColor* theme_trough_color = NULL;
  gtk_widget_style_get(GTK_WIDGET(fake_frame_),
                       "scrollbar-slider-prelight-color", &theme_thumb_active,
                       "scrollbar-slider-normal-color", &theme_thumb_inactive,
                       "scrollbar-trough-color", &theme_trough_color,
                       NULL);

  // Ask the theme if the theme specifies all the scrollbar colors and short
  // circuit the expensive painting/compositing if we have all of them.
  if (theme_thumb_active && theme_thumb_inactive && theme_trough_color) {
    *thumb_active_color = *theme_thumb_active;
    *thumb_inactive_color = *theme_thumb_inactive;
    *track_color = *theme_trough_color;

    gdk_color_free(theme_thumb_active);
    gdk_color_free(theme_thumb_inactive);
    gdk_color_free(theme_trough_color);
    return;
  }

  // Create window containing scrollbar elements
  GtkWidget* window    = gtk_window_new(GTK_WINDOW_POPUP);
  GtkWidget* fixed     = gtk_fixed_new();
  GtkWidget* scrollbar = gtk_hscrollbar_new(NULL);
  gtk_container_add(GTK_CONTAINER(window), fixed);
  gtk_container_add(GTK_CONTAINER(fixed),  scrollbar);
  gtk_widget_realize(window);
  gtk_widget_realize(scrollbar);

  // Draw scrollbar thumb part and track into offscreen image
  const int kWidth  = 100;
  const int kHeight = 20;
  GtkStyle*  style  = gtk_rc_get_style(scrollbar);
  GdkWindow* gdk_window = gtk_widget_get_window(window);
  GdkPixmap* pm     = gdk_pixmap_new(gdk_window, kWidth, kHeight, -1);
  GdkRectangle rect = { 0, 0, kWidth, kHeight };
  unsigned char data[3 * kWidth * kHeight];
  for (int i = 0; i < 3; ++i) {
    if (i < 2) {
      // Thumb part
      gtk_paint_slider(style, pm,
                       i == 0 ? GTK_STATE_PRELIGHT : GTK_STATE_NORMAL,
                       GTK_SHADOW_OUT, &rect, scrollbar, "slider", 0, 0,
                       kWidth, kHeight, GTK_ORIENTATION_HORIZONTAL);
    } else {
      // Track
      gtk_paint_box(style, pm, GTK_STATE_ACTIVE, GTK_SHADOW_IN, &rect,
                    scrollbar, "trough-upper", 0, 0, kWidth, kHeight);
    }
    GdkPixbuf* pb = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB,
                                             FALSE, 8, kWidth, kHeight,
                                             3 * kWidth, 0, 0);
    gdk_pixbuf_get_from_drawable(pb, pm, NULL, 0, 0, 0, 0, kWidth, kHeight);

    // Sample pixels
    int components[3] = { 0 };
    for (int y = 2; y < kHeight - 2; ++y) {
      for (int c = 0; c < 3; ++c) {
        // Sample a vertical slice of pixels at about one-thirds from the
        // left edge. This allows us to avoid any fixed graphics that might be
        // located at the edges or in the center of the scrollbar.
        // Each pixel is made up of a red, green, and blue component; taking up
        // a total of three bytes.
        components[c] += data[3 * (kWidth / 3 + y * kWidth) + c];
      }
    }
    GdkColor* color = i == 0 ? thumb_active_color :
                      i == 1 ? thumb_inactive_color :
                               track_color;
    color->pixel = 0;
    // We sampled pixels across the full height of the image, ignoring a two
    // pixel border. In some themes, the border has a completely different
    // color which we do not want to factor into our average color computation.
    //
    // We now need to scale the colors from the 0..255 range, to the wider
    // 0..65535 range, and we need to actually compute the average color; so,
    // we divide by the total number of pixels in the sample.
    color->red   = components[0] * 65535 / (255 * (kHeight - 4));
    color->green = components[1] * 65535 / (255 * (kHeight - 4));
    color->blue  = components[2] * 65535 / (255 * (kHeight - 4));

    g_object_unref(pb);
  }
  g_object_unref(pm);

  gtk_widget_destroy(window);

  // Override any of the default colors with ones that were specified by the
  // theme.
  if (theme_thumb_active) {
    *thumb_active_color = *theme_thumb_active;
    gdk_color_free(theme_thumb_active);
  }

  if (theme_thumb_inactive) {
    *thumb_inactive_color = *theme_thumb_inactive;
    gdk_color_free(theme_thumb_inactive);
  }

  if (theme_trough_color) {
    *track_color = *theme_trough_color;
    gdk_color_free(theme_trough_color);
  }
}

void Gtk2UI::SetXDGIconTheme() {
  gchar* gtk_theme_name;
  g_object_get(gtk_settings_get_default(),
               "gtk-icon-theme-name",
               &gtk_theme_name, NULL);
  base::nix::SetIconThemeName(gtk_theme_name);
  g_free(gtk_theme_name);
}

void Gtk2UI::LoadGtkValues() {
  // TODO(erg): GtkThemeService had a comment here about having to muck with
  // the raw Prefs object to remove prefs::kCurrentThemeImages or else we'd
  // regress startup time. Figure out how to do that when we can't access the
  // prefs system from here.

  GtkStyle* frame_style = gtk_rc_get_style(fake_frame_);

  GtkStyle* window_style = gtk_rc_get_style(fake_window_);
  SetThemeColorFromGtk(ThemeProperties::COLOR_CONTROL_BACKGROUND,
                       &window_style->bg[GTK_STATE_NORMAL]);

  GdkColor toolbar_color = window_style->bg[GTK_STATE_NORMAL];
  SetThemeColorFromGtk(ThemeProperties::COLOR_TOOLBAR, &toolbar_color);

  GdkColor button_color = window_style->bg[GTK_STATE_SELECTED];
  SetThemeTintFromGtk(ThemeProperties::TINT_BUTTONS, &button_color);

  GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
  GdkColor label_color = label_style->fg[GTK_STATE_NORMAL];
  SetThemeColorFromGtk(ThemeProperties::COLOR_TAB_TEXT, &label_color);
  SetThemeColorFromGtk(ThemeProperties::COLOR_BOOKMARK_TEXT, &label_color);
  SetThemeColorFromGtk(ThemeProperties::COLOR_STATUS_BAR_TEXT, &label_color);

  // Build the various icon tints.
  GetNormalButtonTintHSL(&button_tint_);
  GetNormalEntryForegroundHSL(&entry_tint_);
  GetSelectedEntryForegroundHSL(&selected_entry_tint_);
  GdkColor frame_color = BuildFrameColors(frame_style);

  // The inactive frame color never occurs naturally in the theme, as it is a
  // tinted version of |frame_color|. We generate another color based on the
  // background tab color, with the lightness and saturation moved in the
  // opposite direction. (We don't touch the hue, since there should be subtle
  // hints of the color in the text.)
  color_utils::HSL inactive_tab_text_hsl =
      tints_[ThemeProperties::TINT_BACKGROUND_TAB];
  if (inactive_tab_text_hsl.l < 0.5)
    inactive_tab_text_hsl.l = kDarkInactiveLuminance;
  else
    inactive_tab_text_hsl.l = kLightInactiveLuminance;

  if (inactive_tab_text_hsl.s < 0.5)
    inactive_tab_text_hsl.s = kHeavyInactiveSaturation;
  else
    inactive_tab_text_hsl.s = kLightInactiveSaturation;

  colors_[ThemeProperties::COLOR_BACKGROUND_TAB_TEXT] =
      color_utils::HSLToSkColor(inactive_tab_text_hsl, 255);

  // We pick the text and background colors for the NTP out of the colors for a
  // GtkEntry. We do this because GtkEntries background color is never the same
  // as |toolbar_color|, is usually a white, and when it isn't a white,
  // provides sufficient contrast to |toolbar_color|. Try this out with
  // Darklooks, HighContrastInverse or ThinIce.
  GtkStyle* entry_style = gtk_rc_get_style(fake_entry_.get());
  GdkColor ntp_background = entry_style->base[GTK_STATE_NORMAL];
  GdkColor ntp_foreground = entry_style->text[GTK_STATE_NORMAL];
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_BACKGROUND,
                       &ntp_background);
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_TEXT,
                       &ntp_foreground);

  // The NTP header is the color that surrounds the current active thumbnail on
  // the NTP, and acts as the border of the "Recent Links" box. It would be
  // awesome if they were separated so we could use GetBorderColor() for the
  // border around the "Recent Links" section, but matching the frame color is
  // more important.
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_HEADER,
                       &frame_color);
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION,
                       &toolbar_color);
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_TEXT,
                       &label_color);

  // Override the link color if the theme provides it.
  const GdkColor* link_color = NULL;
  gtk_widget_style_get(GTK_WIDGET(fake_window_),
                       "link-color", &link_color, NULL);

  bool is_default_link_color = false;
  if (!link_color) {
    link_color = &kDefaultLinkColor;
    is_default_link_color = true;
  }

  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK,
                       link_color);
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_LINK_UNDERLINE,
                       link_color);
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK,
                       link_color);
  SetThemeColorFromGtk(ThemeProperties::COLOR_NTP_SECTION_LINK_UNDERLINE,
                       link_color);

  if (!is_default_link_color)
    gdk_color_free(const_cast<GdkColor*>(link_color));

  // Generate the colors that we pass to WebKit.
  focus_ring_color_ = GdkColorToSkColor(frame_color);

  GdkColor thumb_active_color, thumb_inactive_color, track_color;
  Gtk2UI::GetScrollbarColors(&thumb_active_color,
                             &thumb_inactive_color,
                             &track_color);
  thumb_active_color_ = GdkColorToSkColor(thumb_active_color);
  thumb_inactive_color_ = GdkColorToSkColor(thumb_inactive_color);
  track_color_ = GdkColorToSkColor(track_color);

  // Some GTK themes only define the text selection colors on the GtkEntry
  // class, so we need to use that for getting selection colors.
  active_selection_bg_color_ =
      GdkColorToSkColor(entry_style->base[GTK_STATE_SELECTED]);
  active_selection_fg_color_ =
      GdkColorToSkColor(entry_style->text[GTK_STATE_SELECTED]);
  inactive_selection_bg_color_ =
      GdkColorToSkColor(entry_style->base[GTK_STATE_ACTIVE]);
  inactive_selection_fg_color_ =
      GdkColorToSkColor(entry_style->text[GTK_STATE_ACTIVE]);

  // Update the insets that we hand to Gtk2Border.
  UpdateButtonInsets();
}

GdkColor Gtk2UI::BuildFrameColors(GtkStyle* frame_style) {
  GdkColor* theme_frame = NULL;
  GdkColor* theme_inactive_frame = NULL;
  GdkColor* theme_incognito_frame = NULL;
  GdkColor* theme_incognito_inactive_frame = NULL;
  gtk_widget_style_get(GTK_WIDGET(fake_frame_),
                       "frame-color", &theme_frame,
                       "inactive-frame-color", &theme_inactive_frame,
                       "incognito-frame-color", &theme_incognito_frame,
                       "incognito-inactive-frame-color",
                       &theme_incognito_inactive_frame,
                       NULL);

  GdkColor frame_color = BuildAndSetFrameColor(
      &frame_style->bg[GTK_STATE_SELECTED],
      theme_frame,
      kDefaultFrameShift,
      ThemeProperties::COLOR_FRAME,
      ThemeProperties::TINT_FRAME);
  if (theme_frame)
    gdk_color_free(theme_frame);
  SetThemeTintFromGtk(ThemeProperties::TINT_BACKGROUND_TAB, &frame_color);

  BuildAndSetFrameColor(
      &frame_style->bg[GTK_STATE_INSENSITIVE],
      theme_inactive_frame,
      kDefaultFrameShift,
      ThemeProperties::COLOR_FRAME_INACTIVE,
      ThemeProperties::TINT_FRAME_INACTIVE);
  if (theme_inactive_frame)
    gdk_color_free(theme_inactive_frame);

  BuildAndSetFrameColor(
      &frame_color,
      theme_incognito_frame,
      GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO),
      ThemeProperties::COLOR_FRAME_INCOGNITO,
      ThemeProperties::TINT_FRAME_INCOGNITO);
  if (theme_incognito_frame)
    gdk_color_free(theme_incognito_frame);

  BuildAndSetFrameColor(
      &frame_color,
      theme_incognito_inactive_frame,
      GetDefaultTint(ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE),
      ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
      ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE);
  if (theme_incognito_inactive_frame)
    gdk_color_free(theme_incognito_inactive_frame);

  return frame_color;
}

void Gtk2UI::SetThemeColorFromGtk(int id, const GdkColor* color) {
  colors_[id] = GdkColorToSkColor(*color);
}

void Gtk2UI::SetThemeTintFromGtk(int id, const GdkColor* color) {
  color_utils::HSL default_tint = GetDefaultTint(id);
  color_utils::HSL hsl;
  color_utils::SkColorToHSL(GdkColorToSkColor(*color), &hsl);

  if (default_tint.s != -1)
    hsl.s = default_tint.s;

  if (default_tint.l != -1)
    hsl.l = default_tint.l;

  tints_[id] = hsl;
}

GdkColor Gtk2UI::BuildAndSetFrameColor(const GdkColor* base,
                                       const GdkColor* gtk_base,
                                       const color_utils::HSL& tint,
                                       int color_id,
                                       int tint_id) {
  GdkColor out_color = *base;
  if (gtk_base) {
    // The theme author specified a color to use, use it without modification.
    out_color = *gtk_base;
  } else {
    // Tint the basic color since this is a heuristic color instead of one
    // specified by the theme author.
    GdkColorHSLShift(tint, &out_color);
  }
  SetThemeColorFromGtk(color_id, &out_color);
  SetThemeTintFromGtk(tint_id, &out_color);

  return out_color;
}

SkBitmap Gtk2UI::GenerateGtkThemeBitmap(int id) const {
  switch (id) {
    case IDR_THEME_TOOLBAR: {
      GtkStyle* style = gtk_rc_get_style(fake_window_);
      GdkColor* color = &style->bg[GTK_STATE_NORMAL];
      SkBitmap bitmap;
      bitmap.setConfig(SkBitmap::kARGB_8888_Config,
                       kToolbarImageWidth, kToolbarImageHeight);
      bitmap.allocPixels();
      bitmap.eraseRGB(color->red >> 8, color->green >> 8, color->blue >> 8);
      return bitmap;
    }
    case IDR_THEME_TAB_BACKGROUND:
      return GenerateTabImage(IDR_THEME_FRAME);
    case IDR_THEME_TAB_BACKGROUND_INCOGNITO:
      return GenerateTabImage(IDR_THEME_FRAME_INCOGNITO);
    case IDR_FRAME:
    case IDR_THEME_FRAME:
      return GenerateFrameImage(ThemeProperties::COLOR_FRAME,
                                "frame-gradient-color");
    case IDR_FRAME_INACTIVE:
    case IDR_THEME_FRAME_INACTIVE:
      return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INACTIVE,
                                "inactive-frame-gradient-color");
    case IDR_THEME_FRAME_INCOGNITO:
      return GenerateFrameImage(ThemeProperties::COLOR_FRAME_INCOGNITO,
                                "incognito-frame-gradient-color");
    case IDR_THEME_FRAME_INCOGNITO_INACTIVE: {
      return GenerateFrameImage(
          ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE,
          "incognito-inactive-frame-gradient-color");
    }
    // Icons that sit inside the omnibox shouldn't receive TINT_BUTTONS and
    // instead should tint based on the foreground text entry color in GTK+
    // mode because some themes that try to be dark *and* light have very
    // different colors between the omnibox and the normal background area.
    // TODO(erg): Decide what to do about other icons that appear in the
    // omnibox, e.g. content settings icons.
    case IDR_OMNIBOX_EXTENSION_APP:
    case IDR_OMNIBOX_HTTP:
    case IDR_OMNIBOX_SEARCH:
    case IDR_OMNIBOX_STAR:
    case IDR_OMNIBOX_TTS: {
      return GenerateTintedIcon(id, entry_tint_);
    }
    // In GTK mode, the dark versions of the omnibox icons only ever appear in
    // the autocomplete popup and only against the current theme's GtkEntry
    // base[GTK_STATE_SELECTED] color, so tint the icons so they won't collide
    // with the selected color.
    case IDR_OMNIBOX_EXTENSION_APP_DARK:
    case IDR_OMNIBOX_HTTP_DARK:
    case IDR_OMNIBOX_SEARCH_DARK:
    case IDR_OMNIBOX_STAR_DARK:
    case IDR_OMNIBOX_TTS_DARK: {
      return GenerateTintedIcon(id, selected_entry_tint_);
    }
    // In GTK mode, we need to manually render several icons.
    case IDR_BACK:
    case IDR_BACK_D:
    case IDR_BACK_H:
    case IDR_BACK_P:
    case IDR_FORWARD:
    case IDR_FORWARD_D:
    case IDR_FORWARD_H:
    case IDR_FORWARD_P:
    case IDR_HOME:
    case IDR_HOME_H:
    case IDR_HOME_P:
    case IDR_RELOAD:
    case IDR_RELOAD_D:
    case IDR_RELOAD_H:
    case IDR_RELOAD_P:
    case IDR_STOP:
    case IDR_STOP_D:
    case IDR_STOP_H:
    case IDR_STOP_P: {
      return GenerateGTKIcon(id);
    }
    case IDR_TOOLBAR_BEZEL_HOVER:
      return GenerateToolbarBezel(GTK_STATE_PRELIGHT, IDR_TOOLBAR_BEZEL_HOVER);
    case IDR_TOOLBAR_BEZEL_PRESSED:
      return GenerateToolbarBezel(GTK_STATE_ACTIVE, IDR_TOOLBAR_BEZEL_PRESSED);
    case IDR_BROWSER_ACTION_H:
      return GenerateToolbarBezel(GTK_STATE_PRELIGHT, IDR_BROWSER_ACTION_H);
    case IDR_BROWSER_ACTION_P:
      return GenerateToolbarBezel(GTK_STATE_ACTIVE, IDR_BROWSER_ACTION_P);
    default: {
      return GenerateTintedIcon(id, button_tint_);
    }
  }

  return SkBitmap();
}

SkBitmap Gtk2UI::GenerateFrameImage(
    int color_id,
    const char* gradient_name) const {
  // We use two colors: the main color (passed in) and a lightened version of
  // that color (which is supposed to match the light gradient at the top of
  // several GTK+ themes, such as Ambiance, Clearlooks or Bluebird).
  ColorMap::const_iterator it = colors_.find(color_id);
  DCHECK(it != colors_.end());
  SkColor base = it->second;

  gfx::Canvas canvas(gfx::Size(kToolbarImageWidth, kToolbarImageHeight),
      1.0f, true);

  int gradient_size;
  GdkColor* gradient_top_color = NULL;
  gtk_widget_style_get(GTK_WIDGET(fake_frame_),
                       "frame-gradient-size", &gradient_size,
                       gradient_name, &gradient_top_color,
                       NULL);
  if (gradient_size) {
    SkColor lighter = gradient_top_color ?
        GdkColorToSkColor(*gradient_top_color) :
        color_utils::HSLShift(base, kGtkFrameShift);
    if (gradient_top_color)
      gdk_color_free(gradient_top_color);
    skia::RefPtr<SkShader> shader = gfx::CreateGradientShader(
        0, gradient_size, lighter, base);
    SkPaint paint;
    paint.setStyle(SkPaint::kFill_Style);
    paint.setAntiAlias(true);
    paint.setShader(shader.get());

    canvas.DrawRect(gfx::Rect(0, 0, kToolbarImageWidth, gradient_size), paint);
  }

  canvas.FillRect(gfx::Rect(0, gradient_size, kToolbarImageWidth,
                            kToolbarImageHeight - gradient_size), base);
  return canvas.ExtractImageRep().sk_bitmap();
}

SkBitmap Gtk2UI::GenerateTabImage(int base_id) const {
  const SkBitmap* base_image = GetThemeImageNamed(base_id).ToSkBitmap();
  SkBitmap bg_tint = SkBitmapOperations::CreateHSLShiftedBitmap(
      *base_image, GetDefaultTint(ThemeProperties::TINT_BACKGROUND_TAB));
  return SkBitmapOperations::CreateTiledBitmap(
      bg_tint, 0, 0, bg_tint.width(), bg_tint.height());
}

SkBitmap Gtk2UI::GenerateTintedIcon(
    int base_id,
    const color_utils::HSL& tint) const {
  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  return SkBitmapOperations::CreateHSLShiftedBitmap(
      rb.GetImageNamed(base_id).AsBitmap(), tint);
}

SkBitmap Gtk2UI::GenerateGTKIcon(int base_id) const {
  const char* stock_id = NULL;
  GtkStateType gtk_state = GTK_STATE_NORMAL;
  for (unsigned int i = 0; i < arraysize(kGtkIcons); ++i) {
    if (kGtkIcons[i].idr == base_id) {
      stock_id = kGtkIcons[i].stock_id;
      gtk_state = kGtkIcons[i].gtk_state;
      break;
    }
  }
  DCHECK(stock_id);

  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  SkBitmap default_bitmap = rb.GetImageNamed(base_id).AsBitmap();

  gtk_widget_ensure_style(fake_frame_);
  GtkStyle* style = gtk_widget_get_style(fake_frame_);
  GtkIconSet* icon_set = gtk_style_lookup_icon_set(style, stock_id);
  if (!icon_set)
    return default_bitmap;

  // Ask GTK to render the icon to a buffer, which we will steal from.
  GdkPixbuf* gdk_icon = gtk_icon_set_render_icon(
      icon_set,
      style,
      base::i18n::IsRTL() ? GTK_TEXT_DIR_RTL : GTK_TEXT_DIR_LTR,
      gtk_state,
      GTK_ICON_SIZE_SMALL_TOOLBAR,
      fake_frame_,
      NULL);

  if (!gdk_icon) {
    // This can theoretically happen if an icon theme doesn't provide a
    // specific image. This should realistically never happen, but I bet there
    // are some theme authors who don't reliably provide all icons.
    return default_bitmap;
  }

  SkBitmap retval;
  retval.setConfig(SkBitmap::kARGB_8888_Config,
                   default_bitmap.width(),
                   default_bitmap.height());
  retval.allocPixels();
  retval.eraseColor(0);

  const SkBitmap icon = GdkPixbufToImageSkia(gdk_icon);
  g_object_unref(gdk_icon);

  SkCanvas canvas(retval);

  if (gtk_state == GTK_STATE_ACTIVE || gtk_state == GTK_STATE_PRELIGHT) {
    SkBitmap border = DrawGtkButtonBorder(gtk_state,
                                          false,
                                          default_bitmap.width(),
                                          default_bitmap.height());
    canvas.drawBitmap(border, 0, 0);
  }

  canvas.drawBitmap(icon,
                    (default_bitmap.width() / 2) - (icon.width() / 2),
                    (default_bitmap.height() / 2) - (icon.height() / 2));

  return retval;
}

SkBitmap Gtk2UI::GenerateToolbarBezel(int gtk_state, int sizing_idr) const {
  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  SkBitmap default_bitmap =
      rb.GetImageNamed(sizing_idr).AsBitmap();

  SkBitmap retval;
  retval.setConfig(SkBitmap::kARGB_8888_Config,
                   default_bitmap.width(),
                   default_bitmap.height());
  retval.allocPixels();
  retval.eraseColor(0);

  SkCanvas canvas(retval);
  SkBitmap border = DrawGtkButtonBorder(
      gtk_state,
      false,
      default_bitmap.width(),
      default_bitmap.height());
  canvas.drawBitmap(border, 0, 0);

  return retval;
}

void Gtk2UI::GetNormalButtonTintHSL(color_utils::HSL* tint) const {
  GtkStyle* window_style = gtk_rc_get_style(fake_window_);
  const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];
  const GdkColor base_color = window_style->base[GTK_STATE_NORMAL];

  GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
  const GdkColor text_color = label_style->fg[GTK_STATE_NORMAL];

  PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
}

void Gtk2UI::GetNormalEntryForegroundHSL(color_utils::HSL* tint) const {
  GtkStyle* window_style = gtk_rc_get_style(fake_window_);
  const GdkColor accent_gdk_color = window_style->bg[GTK_STATE_SELECTED];

  GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
  const GdkColor text_color = style->text[GTK_STATE_NORMAL];
  const GdkColor base_color = style->base[GTK_STATE_NORMAL];

  PickButtonTintFromColors(accent_gdk_color, text_color, base_color, tint);
}

void Gtk2UI::GetSelectedEntryForegroundHSL(color_utils::HSL* tint) const {
  // The simplest of all the tints. We just use the selected text in the entry
  // since the icons tinted this way will only be displayed against
  // base[GTK_STATE_SELECTED].
  GtkStyle* style = gtk_rc_get_style(fake_entry_.get());
  const GdkColor color = style->text[GTK_STATE_SELECTED];
  color_utils::SkColorToHSL(GdkColorToSkColor(color), tint);
}

SkBitmap Gtk2UI::DrawGtkButtonBorder(int gtk_state,
                                     bool focused,
                                     int width,
                                     int height) const {
  // Create a temporary GTK button to snapshot
  GtkWidget* window = gtk_offscreen_window_new();
  GtkWidget* button = gtk_button_new();
  gtk_widget_set_size_request(button, width, height);
  gtk_container_add(GTK_CONTAINER(window), button);
  gtk_widget_realize(window);
  gtk_widget_realize(button);
  gtk_widget_show(button);
  gtk_widget_show(window);

  if (focused) {
    // We can't just use gtk_widget_grab_focus() here because that sets
    // gtk_widget_is_focus(), but not gtk_widget_has_focus(), which is what the
    // GtkButton's paint checks.
    GTK_WIDGET_SET_FLAGS(button, GTK_HAS_FOCUS);
  }

  gtk_widget_set_state(button, static_cast<GtkStateType>(gtk_state));

  GdkPixmap* pixmap;
  {
    // http://crbug.com/346740
    ANNOTATE_SCOPED_MEMORY_LEAK;
    pixmap = gtk_widget_get_snapshot(button, NULL);
  }
  int w, h;
  gdk_drawable_get_size(GDK_DRAWABLE(pixmap), &w, &h);
  DCHECK_EQ(w, width);
  DCHECK_EQ(h, height);

  // We render the Pixmap to a Pixbuf. This can be slow, as we're scrapping
  // bits from X.
  GdkColormap* colormap = gdk_drawable_get_colormap(pixmap);
  GdkPixbuf* pixbuf = gdk_pixbuf_get_from_drawable(NULL,
                                                   GDK_DRAWABLE(pixmap),
                                                   colormap,
                                                   0, 0, 0, 0, w, h);

  // Finally, we convert our pixbuf into a type we can use.
  SkBitmap border = GdkPixbufToImageSkia(pixbuf);
  g_object_unref(pixbuf);
  g_object_unref(pixmap);
  gtk_widget_destroy(window);

  return border;
}

gfx::Insets Gtk2UI::GetButtonInsets() const {
  return button_insets_;
}

void Gtk2UI::UpdateButtonInsets() {
  GtkWidget* window = gtk_offscreen_window_new();
  GtkWidget* button = gtk_button_new();
  gtk_container_add(GTK_CONTAINER(window), button);

  GtkBorder* border = NULL;
  gtk_widget_style_get(GTK_WIDGET(button),
                       "default-border",
                       &border,
                       NULL);

  gfx::Insets insets;
  if (border) {
    button_insets_ = gfx::Insets(border->top, border->left,
                                 border->bottom, border->right);
    gtk_border_free(border);
  } else {
    // Defined in gtkbutton.c:
    button_insets_ = gfx::Insets(1, 1, 1, 1);
  }

  gtk_widget_destroy(window);
}

void Gtk2UI::ClearAllThemeData() {
  gtk_images_.clear();
}

void Gtk2UI::OnStyleSet(GtkWidget* widget, GtkStyle* previous_style) {
  ClearAllThemeData();
  LoadGtkValues();

  FOR_EACH_OBSERVER(views::NativeThemeChangeObserver, theme_change_observers_,
                    OnNativeThemeChanged());
}

}  // namespace libgtk2ui

views::LinuxUI* BuildGtk2UI() {
  return new libgtk2ui::Gtk2UI;
}
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root/chrome/browser/ui/libgtk2ui/gtk2_ui.cc

DEFINITIONS
