Rewrite clipboard write IPC handling to be easier to understand.

ui/base/clipboard/scoped_clipboard_writer.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.
 
 // This file implements the ScopedClipboardWriter class. Documentation on its
 // purpose can be found in our header. Documentation on the format of the
 // parameters for each clipboard target can be found in clipboard.h.
 
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 
@@ skipping 68 matching lines @@
   html.append("\">");
   html.append(net::EscapeForHTML(base::UTF16ToUTF8(anchor_text)));
   html.append("</a>");
   WriteHTML(base::UTF8ToUTF16(html), std::string());
 }
 
 void ScopedClipboardWriter::WriteWebSmartPaste() {
   objects_[Clipboard::CBF_WEBKIT] = Clipboard::ObjectMapParams();
 }
 
+void ScopedClipboardWriter::WriteImage(const SkBitmap& bitmap) {
+  if (bitmap.drawsNothing()) {
+    NOTREACHED();
+    return;
+  }
+  bitmap_ = bitmap;
+  // TODO(dcheng): This is slightly less horrible than what we used to do, but
+  // only very slightly less.
+  SkBitmap* bitmap_pointer = &bitmap_;
+  Clipboard::ObjectMapParam packed_pointer;
+  packed_pointer.resize(sizeof(bitmap_pointer));
+  *reinterpret_cast<SkBitmap**>(&*packed_pointer.begin()) = bitmap_pointer;
+  Clipboard::ObjectMapParams parameters;
+  parameters.push_back(packed_pointer);
+  objects_[Clipboard::CBF_SMBITMAP] = parameters;
+}
+
 void ScopedClipboardWriter::WritePickledData(
     const Pickle& pickle, const Clipboard::FormatType& format) {
   std::string format_string = format.Serialize();
   Clipboard::ObjectMapParam format_parameter(format_string.begin(),
                                              format_string.end());
   Clipboard::ObjectMapParam data_parameter;
 
   data_parameter.resize(pickle.size());
   memcpy(const_cast<char*>(&data_parameter.front()),
          pickle.data(), pickle.size());
 
   Clipboard::ObjectMapParams parameters;
   parameters.push_back(format_parameter);
   parameters.push_back(data_parameter);
   objects_[Clipboard::CBF_DATA] = parameters;
 }
 
 void ScopedClipboardWriter::Reset() {
   url_text_.clear();
   objects_.clear();
+  bitmap_.reset();
 }
 
 void ScopedClipboardWriter::WriteTextOrURL(const base::string16& text,
                                            bool is_url) {
   std::string utf8_text = base::UTF16ToUTF8(text);
 
   Clipboard::ObjectMapParams parameters;
   parameters.push_back(Clipboard::ObjectMapParam(utf8_text.begin(),
                                                  utf8_text.end()));
   objects_[Clipboard::CBF_TEXT] = parameters;
 
   if (is_url) {
     url_text_ = utf8_text;
   } else {
     url_text_.clear();
   }
 }
 
 }  // namespace ui