Printing: Split off Win/Mac implementations of the Image class into their own

files.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3966002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63316 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 88 insertions, 0 deletions

diff --git a/printing/image_win.cc b/printing/image_win.cc
new file mode 100644
index 0000000..e8bd368
--- /dev/null
+++ b/printing/image_win.cc
@@ -0,0 +1,88 @@
+// Copyright (c) 2010 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/image.h"
+
+#include "gfx/gdi_util.h"  // EMF support
+#include "gfx/rect.h"
+#include "skia/ext/platform_device.h"
+
+namespace {
+
+// A simple class which temporarily overrides system settings.
+// The bitmap image rendered via the PlayEnhMetaFile() function depends on
+// some system settings.
+// As a workaround for such dependency, this class saves the system settings
+// and changes them. This class also restore the saved settings in its
+// destructor.
+class DisableFontSmoothing {
+ public:
+  explicit DisableFontSmoothing() : enable_again_(false) {
+    BOOL enabled;
+    if (SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &enabled, 0) &&
+        enabled) {
+      if (SystemParametersInfo(SPI_SETFONTSMOOTHING, FALSE, NULL, 0))
+        enable_again_ = true;
+    }
+  }
+
+  ~DisableFontSmoothing() {
+    if (enable_again_) {
+      BOOL result = SystemParametersInfo(SPI_SETFONTSMOOTHING, TRUE, NULL, 0);
+      DCHECK(result);
+    }
+  }
+
+ private:
+  bool enable_again_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisableFontSmoothing);
+};
+
+}  // namespace
+
+namespace printing {
+
+bool Image::LoadMetafile(const NativeMetafile& metafile) {
+    gfx::Rect rect(metafile.GetBounds());
+  DisableFontSmoothing disable_in_this_scope;
+
+  // Create a temporary HDC and bitmap to retrieve the rendered data.
+  HDC hdc = CreateCompatibleDC(NULL);
+  BITMAPV4HEADER hdr;
+  DCHECK_EQ(rect.x(), 0);
+  DCHECK_EQ(rect.y(), 0);
+  DCHECK_GE(rect.width(), 0);  // Metafile could be empty.
+  DCHECK_GE(rect.height(), 0);
+
+  if (rect.width() < 1 || rect.height() < 1)
+    return false;
+
+  size_ = rect.size();
+  gfx::CreateBitmapV4Header(rect.width(), rect.height(), &hdr);
+  void* bits;
+  HBITMAP bitmap = CreateDIBSection(hdc,
+                                    reinterpret_cast<BITMAPINFO*>(&hdr), 0,
+                                    &bits, NULL, 0);
+  DCHECK(bitmap);
+  DCHECK(SelectObject(hdc, bitmap));
+
+  skia::PlatformDevice::InitializeDC(hdc);
+
+  bool success = metafile.Playback(hdc, NULL);
+
+  row_length_ = size_.width() * sizeof(uint32);
+  size_t bytes = row_length_ * size_.height();
+  DCHECK(bytes);
+
+  data_.resize(bytes);
+  memcpy(&*data_.begin(), bits, bytes);
+
+  DeleteDC(hdc);
+  DeleteObject(bitmap);
+
+  return success;
+}
+
+}  // namespace printing