Select theme resources from ResourceBundle at requested scale factor.

ui/base/resource/resource_bundle.cc

 // 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 "ui/base/resource/resource_bundle.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 268 matching lines @@
   for (size_t i = 0; i < data_packs_.size(); ++i) {
     base::RefCountedStaticMemory* bytes =
         data_packs_[i]->GetStaticMemory(resource_id);
     if (bytes)
       return bytes;
   }
 
   return NULL;
 }
 
+base::RefCountedStaticMemory* ResourceBundle::LoadImageResourceBytes(
+    int resource_id,
+    float scale_factor) const {
+  base::StringPiece data = GetRawImageResource(resource_id, scale_factor);
+  if (data.empty())
+    return NULL;
+
+  return new base::RefCountedStaticMemory(
+      reinterpret_cast<const unsigned char*>(data.data()), data.length());
+}
+
+base::StringPiece ResourceBundle::GetRawImageResource(
+    int resource_id,
+    float scale_factor) const {
+  base::StringPiece best_match;
+  float best_match_scale = 0;
+  for (size_t i = 0; i < data_packs_.size(); ++i) {
+    if (best_match.empty() ||
+        fabs(best_match_scale - scale_factor) >
+            fabs(data_packs_[i]->GetScaleFactor() - scale_factor)) {
+      if (data_packs_[i]->GetStringPiece(resource_id, &best_match))

[sail, 2012/05/09 16:09:41]

Worse case this will cause StringPiece to be overwritten 3 times (1.0, 1.4,
1.8). Can we just store the best match index instead?

[flackr, 2012/05/09 19:57:01]

Done.

+        best_match_scale = data_packs_[i]->GetScaleFactor();
+    }
+  }
+  return best_match;
+}
+
 base::StringPiece ResourceBundle::GetRawDataResource(int resource_id) const {
   DCHECK(locale_resources_data_.get());
   base::StringPiece data;
   if (locale_resources_data_->GetStringPiece(resource_id, &data))
     return data;
 
   for (size_t i = 0; i < data_packs_.size(); ++i) {
     if (data_packs_[i]->GetStringPiece(resource_id, &data))
       return data;
   }
@@ skipping 107 matching lines @@
     SkBitmap* bitmap = new SkBitmap();
     bitmap->setConfig(SkBitmap::kARGB_8888_Config, 32, 32);
     bitmap->allocPixels();
     bitmap->eraseARGB(255, 255, 0, 0);
     empty_image = new gfx::Image(bitmap);
   }
   return empty_image;
 }
 
 }  // namespace ui