hidpi support for custom cursors in windows

content/common/cursors/webcursor_aurawin.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 "content/common/cursors/webcursor.h"
 
 #include <windows.h>
 
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
 #include "ui/gfx/icon_util.h"
 
 namespace content {
 
 ui::PlatformCursor WebCursor::GetPlatformCursor() {
   if (!IsCustom())
     return LoadCursor(NULL, IDC_ARROW);
 
   if (custom_cursor_)
     return custom_cursor_;
 
-  custom_cursor_ =
-      IconUtil::CreateCursorFromDIB(
-          custom_size_,
-          hotspot_,
-          !custom_data_.empty() ? &custom_data_[0] : NULL,
-          custom_data_.size());
+  if (custom_data_.size() == 0)

[ananta, 2015/12/15 23:28:17]

should this be an error condition? and hence a dcheck?

[Bret, 2015/12/16 19:03:59]

Done.

+    return 0;
+
+  SkBitmap bitmap;
+  gfx::Point hotspot;
+  CreateScaledBitmapAndHotspotFromCustomData(&bitmap, &hotspot);
+
+  gfx::Size custom_size;
+  std::vector<char> custom_data;
+  CreateCustomData(bitmap, custom_data, custom_size);
+
+  custom_cursor_ = IconUtil::CreateCursorFromDIB(
+      custom_size,
+      hotspot,
+      !custom_data.empty() ? &custom_data[0] : NULL,
+      custom_data.size());
   return custom_cursor_;
 }
 
-void WebCursor::SetDisplayInfo(const gfx::Display& display) {
-  // TODO(winguru): Add support for scaling the cursor.
-}
-
 void WebCursor::InitPlatformData() {
   custom_cursor_ = NULL;
 }
 
 bool WebCursor::SerializePlatformData(base::Pickle* pickle) const {
   return true;
 }
 
 bool WebCursor::DeserializePlatformData(base::PickleIterator* iter) {
   return true;
 }
 
 bool WebCursor::IsPlatformDataEqual(const WebCursor& other) const {
   return true;
 }
 
 void WebCursor::CleanupPlatformData() {
   if (custom_cursor_) {
     DestroyIcon(custom_cursor_);
     custom_cursor_ = NULL;
   }
 }
 
 void WebCursor::CopyPlatformData(const WebCursor& other) {
 }
 
 }  // namespace content