Make scoped dc objects smarter.

chrome/renderer/print_web_view_helper_win.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 "chrome/renderer/print_web_view_helper.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/process_util.h"
@@ skipping 261 matching lines @@
       // Therefore, expecting a metafile with page count 1.
       DCHECK_EQ(1U, metafile->GetPageCount());
 
       // Close the device context to retrieve the compiled metafile.
       if (!metafile->FinishDocument())
         NOTREACHED();
 
       // Page used alpha blend, but printer doesn't support it.  Rewrite the
       // metafile and flatten out the transparency.
       base::win::ScopedGetDC screen_dc(NULL);
-      base::win::ScopedCreateDC bitmap_dc(CreateCompatibleDC(screen_dc));
-      if (!bitmap_dc)
+      base::win::ScopedCreateDC bitmap_dc(CreateCompatibleDC(screen_dc.get()));
+      if (!bitmap_dc.get())
         NOTREACHED() << "Bitmap DC creation failed";
-      SetGraphicsMode(bitmap_dc, GM_ADVANCED);
+      SetGraphicsMode(bitmap_dc.get(), GM_ADVANCED);
       void* bits = NULL;
       BITMAPINFO hdr;
       gfx::CreateBitmapHeader(page_size.width(), page_size.height(),
                               &hdr.bmiHeader);
       base::win::ScopedBitmap hbitmap(CreateDIBSection(
-          bitmap_dc, &hdr, DIB_RGB_COLORS, &bits, NULL, 0));
+        bitmap_dc.get(), &hdr, DIB_RGB_COLORS, &bits, NULL, 0));
       if (!hbitmap)
         NOTREACHED() << "Raster bitmap creation for printing failed";
 
-      base::win::ScopedSelectObject selectBitmap(bitmap_dc, hbitmap);
+      base::win::ScopedSelectObject selectBitmap(bitmap_dc.get(), hbitmap);
       RECT rect = { 0, 0, page_size.width(), page_size.height() };
       HBRUSH whiteBrush = static_cast<HBRUSH>(GetStockObject(WHITE_BRUSH));
-      FillRect(bitmap_dc, &rect, whiteBrush);
+      FillRect(bitmap_dc.get(), &rect, whiteBrush);
 
       Metafile* metafile2(new printing::NativeMetafile);
       metafile2->Init();
       HDC hdc = metafile2->context();
       DCHECK(hdc);
       skia::InitializeDC(hdc);
 
       RECT metafile_bounds = metafile->GetPageBounds(1).ToRECT();
       // Process the old metafile, placing all non-AlphaBlend calls into the
       // new metafile, and copying the results of all the AlphaBlend calls
@@ skipping 33 matching lines @@
     shared_buf.Unmap();
     return false;
   }
   shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), shared_mem_handle);
   shared_buf.Unmap();
 
   Send(new PrintHostMsg_DuplicateSection(routing_id(), *shared_mem_handle,
                                          shared_mem_handle));
   return true;
 }