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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/icon_loader.h"
      6 
      7 #include <windows.h>
      8 #include <shellapi.h>
      9 
     10 #include "base/bind.h"
     11 #include "base/message_loop/message_loop.h"
     12 #include "base/threading/thread.h"
     13 #include "third_party/skia/include/core/SkBitmap.h"
     14 #include "ui/gfx/icon_util.h"
     15 #include "ui/gfx/image/image_skia.h"
     16 #include "ui/gfx/size.h"
     17 #include "ui/gfx/win/dpi.h"
     18 
     19 // static
     20 IconGroupID IconLoader::ReadGroupIDFromFilepath(
     21     const base::FilePath& filepath) {
     22   if (!IsIconMutableFromFilepath(filepath))
     23     return filepath.Extension();
     24   return filepath.value();
     25 }
     26 
     27 // static
     28 bool IconLoader::IsIconMutableFromFilepath(const base::FilePath& filepath) {
     29   return filepath.MatchesExtension(L".exe") ||
     30          filepath.MatchesExtension(L".dll") ||
     31          filepath.MatchesExtension(L".ico");
     32 }
     33 
     34 // static
     35 content::BrowserThread::ID IconLoader::ReadIconThreadID() {
     36   return content::BrowserThread::FILE;
     37 }
     38 
     39 void IconLoader::ReadIcon() {
     40   int size = 0;
     41   switch (icon_size_) {
     42     case IconLoader::SMALL:
     43       size = SHGFI_SMALLICON;
     44       break;
     45     case IconLoader::NORMAL:
     46       size = 0;
     47       break;
     48     case IconLoader::LARGE:
     49       size = SHGFI_LARGEICON;
     50       break;
     51     default:
     52       NOTREACHED();
     53   }
     54 
     55   image_.reset();
     56 
     57   SHFILEINFO file_info = { 0 };
     58   if (SHGetFileInfo(group_.c_str(), FILE_ATTRIBUTE_NORMAL, &file_info,
     59                      sizeof(SHFILEINFO),
     60                      SHGFI_ICON | size | SHGFI_USEFILEATTRIBUTES)) {
     61     scoped_ptr<SkBitmap> bitmap(IconUtil::CreateSkBitmapFromHICON(
     62         file_info.hIcon));
     63     if (bitmap.get()) {
     64       gfx::ImageSkia image_skia(gfx::ImageSkiaRep(
     65           *bitmap, gfx::win::GetDeviceScaleFactor()));
     66       image_skia.MakeThreadSafe();
     67       image_.reset(new gfx::Image(image_skia));
     68       DestroyIcon(file_info.hIcon);
     69     }
     70   }
     71 
     72   // Always notify the delegate, regardless of success.
     73   target_message_loop_->PostTask(FROM_HERE,
     74       base::Bind(&IconLoader::NotifyDelegate, this));
     75 }
     76