Allow themes to change the background of the new tab page....

chrome/browser/browser_theme_provider.h

 // 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.
 
 #ifndef CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_
 #define CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 22 matching lines @@
 
   enum {
     COLOR_FRAME,
     COLOR_FRAME_INACTIVE,
     COLOR_FRAME_INCOGNITO,
     COLOR_FRAME_INCOGNITO_INACTIVE,
     COLOR_TOOLBAR,
     COLOR_TAB_TEXT,
     COLOR_BACKGROUND_TAB_TEXT,
     COLOR_BOOKMARK_TEXT,
+    COLOR_NTP_BACKGROUND,
     COLOR_NTP_TEXT,
     COLOR_NTP_LINK,
     COLOR_NTP_SECTION,
     TINT_BUTTONS,
     TINT_FRAME,
     TINT_FRAME_INACTIVE,
     TINT_FRAME_INCOGNITO,
     TINT_FRAME_INCOGNITO_INACTIVE,
-    TINT_BACKGROUND_TAB
+    TINT_BACKGROUND_TAB,
+    NTP_BACKGROUND_ALIGNMENT
   };
 
+  // A bitfield mask for alignments.
+  typedef enum {
+    ALIGN_CENTER = 0x0,
+    ALIGN_LEFT = 0x1,
+    ALIGN_TOP = 0x2,
+    ALIGN_RIGHT = 0x4,
+    ALIGN_BOTTOM = 0x8,
+  } AlignmentMasks;
+
   void Init(Profile* profile);
 
   // ThemeProvider implementation.
   virtual SkBitmap* GetBitmapNamed(int id);
   virtual SkColor GetColor(int id);
+  virtual bool GetDisplayProperty(int id, int* result);
   virtual bool ShouldUseNativeFrame();
 #if defined(OS_LINUX)
   virtual GdkPixbuf* GetPixbufNamed(int id);
 #endif
 
   // Set the current theme to the theme defined in |extension|.
   void SetTheme(Extension* extension);
 
   // Reset the theme to default.
   void UseDefaultTheme();
 
+  // Convert a bitfield alignment into a string like "top left". Public so that
+  // it can be used to generate CSS values. Takes a bitfield of AlignmentMasks.
+  static std::string AlignmentToString(int alignment);
+
+  // Parse alignments from something like "top left" into a bitfield of
+  // AlignmentMasks
+  static int StringToAlignment(const std::string &alignment);
+
  private:
   typedef std::map<const int, std::string> ImageMap;
   typedef std::map<const std::string, SkColor> ColorMap;
   typedef std::map<const std::string, skia::HSL> TintMap;
+  typedef std::map<const std::string, int> DisplayPropertyMap;
 
   // Loads a bitmap from the theme, which may be tinted or
   // otherwise modified, or an application default.
   SkBitmap* LoadThemeBitmap(int id);
 
   // Get the specified tint - |id| is one of the TINT_* enum values.
   skia::HSL GetTint(int id);
 
   // Tint |bitmap| with the tint specified by |hsl_id|
   SkBitmap TintBitmap(const SkBitmap& bitmap, int hsl_id);
 
   // The following load data from specified dictionaries (either from
   // preferences or from an extension manifest) and update our theme
   // data appropriately.
   // Allow any ResourceBundle image to be overridden. |images| should
   // contain keys defined in ThemeResourceMap, and values as paths to
   // the images on-disk.
   void SetImageData(DictionaryValue* images,
                     FilePath images_path);
   // Set our theme colors. The keys of |colors| are any of the kColor*
   // constants, and the values are a three-item list containing 8-bit
   // RGB values.
   void SetColorData(DictionaryValue* colors);
+
   // Set tint data for our images and colors. The keys of |tints| are
   // any of the kTint* contstants, and the values are a three-item list
   // containing real numbers in the range 0-1 (and -1 for 'null').
   void SetTintData(DictionaryValue* tints);
 
+  // Set miscellaneous display properties. While these can be defined as
+  // strings, they are currently stored as integers.
+  void SetDisplayPropertyData(DictionaryValue* display_properties);
+
   // Generate any frame colors that weren't specified.
   void GenerateFrameColors();
 
   // Generate any frame images that weren't specified. The resulting images
   // will be stored in our cache.
   void GenerateFrameImages();
 
   // Create any images that aren't pregenerated (e.g. background tab images).
   SkBitmap* GenerateBitmap(int id);
 
   // Save our data - when saving images we need the original dictionary
   // from the extension because it contains the text ids that we want to save.
   void SaveImageData(DictionaryValue* images);
   void SaveColorData();
   void SaveTintData();
+  void SaveDisplayPropertyData();
 
   // Let all the browser views know that themes have changed.
   void NotifyThemeChanged();
 
   // Load theme data from preferences.
   void LoadThemePrefs();
 
   // Frees generated images and clears the image cache.
   void FreeImages();
 
   // Cached images. We cache all retrieved and generated bitmaps and keep
   // track of the pointers.
   typedef std::map<int, SkBitmap*> ImageCache;
   ImageCache image_cache_;
 #if defined(OS_LINUX)
   typedef std::map<int, GdkPixbuf*> GdkPixbufMap;
   GdkPixbufMap gdk_pixbufs_;
 #endif
 
   // List of generate images that aren't stored in ResourceBundles image cache
   // and need to be freed.
   std::vector<SkBitmap*> generated_images_;
 
   ResourceBundle& rb_;
   Profile* profile_;
 
   ImageMap images_;
   ColorMap colors_;
   TintMap tints_;
+  DisplayPropertyMap display_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserThemeProvider);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_