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      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/themes/theme_service.h"
      6 
      7 #include <gdk-pixbuf/gdk-pixbuf.h>
      8 
      9 #include "base/i18n/rtl.h"
     10 #include "base/logging.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "third_party/skia/include/core/SkBitmap.h"
     13 #include "ui/gfx/gtk_util.h"
     14 #include "ui/gfx/image/image.h"
     15 
     16 GdkPixbuf* ThemeService::GetRTLEnabledPixbufNamed(int id) const {
     17   return GetPixbufImpl(id, true);
     18 }
     19 
     20 GdkPixbuf* ThemeService::GetPixbufImpl(int id, bool rtl_enabled) const {
     21   DCHECK(CalledOnValidThread());
     22   // Use the negative |resource_id| for the key for BIDI-aware images.
     23   int key = rtl_enabled ? -id : id;
     24 
     25   // Check to see if we already have the pixbuf in the cache.
     26   GdkPixbufMap::const_iterator pixbufs_iter = gdk_pixbufs_.find(key);
     27   if (pixbufs_iter != gdk_pixbufs_.end())
     28     return pixbufs_iter->second;
     29 
     30   SkBitmap bitmap = GetImageNamed(id).AsBitmap();
     31   GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(bitmap);
     32 
     33   // We loaded successfully.  Cache the pixbuf.
     34   if (pixbuf) {
     35     if (base::i18n::IsRTL() && rtl_enabled) {
     36       GdkPixbuf* original_pixbuf = pixbuf;
     37       pixbuf = gdk_pixbuf_flip(pixbuf, TRUE);
     38       g_object_unref(original_pixbuf);
     39     }
     40 
     41     gdk_pixbufs_[key] = pixbuf;
     42     return pixbuf;
     43   }
     44 
     45   // We failed to retrieve the bitmap, show a debugging red square.
     46   LOG(WARNING) << "Unable to load GdkPixbuf with id " << id;
     47   NOTREACHED();  // Want to assert in debug mode.
     48 
     49   static GdkPixbuf* empty_bitmap = NULL;
     50   if (!empty_bitmap) {
     51     // The placeholder bitmap is bright red so people notice the problem.
     52     SkBitmap skia_bitmap;
     53     skia_bitmap.setConfig(SkBitmap::kARGB_8888_Config, 32, 32);
     54     skia_bitmap.allocPixels();
     55     skia_bitmap.eraseARGB(255, 255, 0, 0);
     56     empty_bitmap = gfx::GdkPixbufFromSkBitmap(skia_bitmap);
     57   }
     58   return empty_bitmap;
     59 }
     60 
     61 void ThemeService::FreePlatformCaches() {
     62   DCHECK(CalledOnValidThread());
     63 
     64   // Free GdkPixbufs.
     65   for (GdkPixbufMap::iterator i = gdk_pixbufs_.begin();
     66        i != gdk_pixbufs_.end(); i++) {
     67     g_object_unref(i->second);
     68   }
     69   gdk_pixbufs_.clear();
     70 }
     71