Create a Factory for NativeMetafile.

printing/emf_win_unittest.cc

 // Copyright (c) 2011 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 "printing/emf_win.h"
 
 // For quick access.
 #include <wingdi.h>
 #include <winspool.h>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
 #include "base/scoped_temp_dir.h"
 #include "base/win/scoped_hdc.h"
+#include "printing/metafile_factory.h"
 #include "printing/printing_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 // This test is automatically disabled if no printer named "UnitTest Printer" is
 // available.
 class EmfPrintingTest : public testing::Test {
  public:
   typedef testing::Test Parent;
@@ skipping 160 matching lines @@
   // Playback the data.
   hdc = CreateCompatibleDC(NULL);
   EXPECT_TRUE(hdc);
   EXPECT_TRUE(emf.CreateFromFile(metafile_path));
   RECT output_rect = {0, 0, 10, 10};
   EXPECT_TRUE(emf.Playback(hdc, &output_rect));
   EXPECT_TRUE(DeleteDC(hdc));
   emf.CloseEmf();
 }
 
+TEST(EmfTest, DCFactory) {
+  // Simplest use case.
+  scoped_ptr<printing::NativeMetafile> emf_ptr(
+      printing::MetafileFactory::GetMetafile());
+  RECT rect = {100, 100, 200, 200};
+  HDC hdc = CreateCompatibleDC(NULL);
+  EXPECT_TRUE(hdc != NULL);
+  EXPECT_TRUE(emf_ptr->CreateDc(hdc, &rect));
+  EXPECT_TRUE(emf_ptr->hdc() != NULL);
+  // In theory, you'd use the HDC with GDI functions here.
+  EXPECT_TRUE(emf_ptr->CloseDc());
+  uint32 size = emf_ptr->GetDataSize();
+  EXPECT_EQ(size, EMF_HEADER_SIZE);
+  std::vector<BYTE> data;
+  EXPECT_TRUE(emf_ptr->GetData(&data));
+  EXPECT_EQ(data.size(), size);
+  emf_ptr->CloseEmf();
+  EXPECT_TRUE(DeleteDC(hdc));
+
+  // Playback the data.
+  hdc = CreateCompatibleDC(NULL);
+  EXPECT_TRUE(hdc);
+  EXPECT_TRUE(emf_ptr->Init(&data.front(), size));
+  RECT output_rect = {0, 0, 10, 10};
+  EXPECT_TRUE(emf_ptr->Playback(hdc, &output_rect));
+  EXPECT_TRUE(DeleteDC(hdc));
+}
+