GTK: First draft of using native themes, partially based on evan's CL 118358.

chrome/browser/gtk/gtk_theme_provider.cc

Index: chrome/browser/gtk/gtk_theme_provider.cc
diff --git a/chrome/browser/gtk/gtk_theme_provider.cc b/chrome/browser/gtk/gtk_theme_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f0303983aa23cf8094df9e42001511909eb2e1ab
--- /dev/null
+++ b/chrome/browser/gtk/gtk_theme_provider.cc
@@ -0,0 +1,154 @@
+// Copyright (c) 2009 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/gtk/gtk_theme_provider.h"
+
+#include <gtk/gtk.h>
+
+#include "base/gfx/gtk_util.h"
+#include "chrome/browser/metrics/user_metrics.h"
+#include "chrome/browser/profile.h"
+#include "chrome/common/pref_names.h"
+#include "grit/theme_resources.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+
+namespace {
+
+// The size of the rendered toolbar image.
+const int kToolbarImageWidth = 64;
+const int kToolbarImageHeight = 128;
+
+}  // namespace
+
+GtkThemeProvider::GtkThemeProvider()
+    : BrowserThemeProvider(),
+      fake_window_(gtk_window_new(GTK_WINDOW_TOPLEVEL)) {
+  // Only realized widgets receive style-set notifications, which we need to
+  // broadcast new theme images and colors.
+  gtk_widget_realize(fake_window_);
+  g_signal_connect(fake_window_, "style-set", G_CALLBACK(&OnStyleSet), this);
+}
+
+GtkThemeProvider::~GtkThemeProvider() {
+  gtk_widget_destroy(fake_window_);
+}
+
+void GtkThemeProvider::SetTheme(Extension* extension) {
+  profile()->GetPrefs()->SetBoolean(prefs::kUsesSystemTheme, false);
+  BrowserThemeProvider::SetTheme(extension);
+}
+
+void GtkThemeProvider::UseDefaultTheme() {
+  profile()->GetPrefs()->SetBoolean(prefs::kUsesSystemTheme, false);
+  BrowserThemeProvider::UseDefaultTheme();
+}
+
+void GtkThemeProvider::SetNativeTheme() {
+  profile()->GetPrefs()->SetBoolean(prefs::kUsesSystemTheme, true);
+  ClearAllThemeData();
+  LoadGtkValues();
+  NotifyThemeChanged();
+}
+
+// static
+bool GtkThemeProvider::UseSystemThemeGraphics(Profile* profile) {
+  return profile->GetPrefs()->GetBoolean(prefs::kUsesSystemTheme);
+}
+
+void GtkThemeProvider::LoadThemePrefs() {
+  if (profile()->GetPrefs()->GetBoolean(prefs::kUsesSystemTheme)) {
+    LoadGtkValues();
+  } else {
+    BrowserThemeProvider::LoadThemePrefs();
+  }
+}
+
+SkBitmap* GtkThemeProvider::LoadThemeBitmap(int id) {
+  if (id == IDR_THEME_TOOLBAR && UseSystemThemeGraphics(profile())) {
+    GtkStyle* style = gtk_rc_get_style(fake_window_);
+    GdkColor* color = &style->bg[GTK_STATE_NORMAL];
+    SkBitmap* bitmap = new SkBitmap;
+    bitmap->setConfig(SkBitmap::kARGB_8888_Config,
+                      kToolbarImageWidth, kToolbarImageHeight);
+    bitmap->allocPixels();
+    bitmap->eraseRGB(color->red >> 8, color->green >> 8, color->blue >> 8);
+    return bitmap;
+  } else {
+    return BrowserThemeProvider::LoadThemeBitmap(id);
+  }
+}
+
+// static
+void GtkThemeProvider::OnStyleSet(GtkWidget* widget,
+                                  GtkStyle* previous_style,
+                                  GtkThemeProvider* provider) {
+  if (provider->profile()->GetPrefs()->GetBoolean(prefs::kUsesSystemTheme)) {
+    provider->ClearAllThemeData();
+    provider->LoadGtkValues();
+    provider->NotifyThemeChanged();
+  }
+}
+
+void GtkThemeProvider::LoadGtkValues() {
+  GtkStyle* style = gtk_rc_get_style(fake_window_);
+
+  SetThemeColorFromGtk(themes::kColorFrame, &style->bg[GTK_STATE_SELECTED]);
+  SetThemeColorFromGtk(themes::kColorFrameInactive,
+                       &style->bg[GTK_STATE_INSENSITIVE]);
+  // TODO(erg): Incognito images.
+  SetThemeColorFromGtk(themes::kColorToolbar,
+                       &style->bg[GTK_STATE_NORMAL]);
+  SetThemeColorFromGtk(themes::kColorTabText,
+                       &style->text[GTK_STATE_NORMAL]);
+  SetThemeColorFromGtk(themes::kColorBackgroundTabText,
+                       &style->text[GTK_STATE_NORMAL]);
+  SetThemeColorFromGtk(themes::kColorBookmarkText,
+                       &style->text[GTK_STATE_NORMAL]);
+  SetThemeColorFromGtk(themes::kColorControlBackground,
+                       &style->bg[GTK_STATE_NORMAL]);
+  SetThemeColorFromGtk(themes::kColorButtonBackground,
+                       &style->bg[GTK_STATE_NORMAL]);
+
+  SetThemeTintFromGtk(themes::kTintButtons, &style->bg[GTK_STATE_SELECTED],
+                      themes::kDefaultTintButtons);
+  SetThemeTintFromGtk(themes::kTintFrame, &style->bg[GTK_STATE_SELECTED],
+                      themes::kDefaultTintFrame);
+  SetThemeTintFromGtk(themes::kTintFrameInactive,
+                      &style->bg[GTK_STATE_SELECTED],
+                      themes::kDefaultTintFrameInactive);
+  SetThemeTintFromGtk(themes::kTintFrameIncognito,
+                      &style->bg[GTK_STATE_SELECTED],
+                      themes::kDefaultTintFrameIncognito);
+  SetThemeTintFromGtk(themes::kTintFrameIncognitoInactive,
+                      &style->bg[GTK_STATE_SELECTED],
+                      themes::kDefaultTintFrameIncognitoInactive);
+  SetThemeTintFromGtk(themes::kTintBackgroundTab,
+                      &style->bg[GTK_STATE_SELECTED],
+                      themes::kDefaultTintBackgroundTab);
+
+  GenerateFrameColors();
+  GenerateFrameImages();
+}
+
+void GtkThemeProvider::SetThemeColorFromGtk(const char* id, GdkColor* color) {
+  SetColor(id, SkColorSetRGB(color->red >> 8,
+                             color->green >> 8,
+                             color->blue >> 8));
+}
+
+void GtkThemeProvider::SetThemeTintFromGtk(const char* id, GdkColor* color,
+                                           const skia::HSL& default_tint) {
+  skia::HSL hsl;
+  skia::SkColorToHSL(SkColorSetRGB((color->red >> 8),
+                                   (color->green >> 8),
+                                   (color->blue >> 8)), hsl);
+  if (default_tint.s != -1)
+    hsl.s = default_tint.s;
+
+  if (default_tint.l != -1)
+    hsl.l = default_tint.l;
+  SetTint(id, hsl);
+}
+