Rewrite clipboard write IPC handling to be easier to understand.

content/renderer/renderer_clipboard_delegate.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 provides the embedder's side of the Clipboard interface.
+
+#include "content/renderer/renderer_clipboard_delegate.h"
+
+#include "base/memory/shared_memory.h"
+#include "base/numerics/safe_math.h"
+#include "content/common/clipboard_messages.h"
+#include "content/public/renderer/content_renderer_client.h"
+#include "content/renderer/render_thread_impl.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/clipboard/clipboard.h"
+#include "ui/gfx/size.h"
+
+namespace content {
+
+RendererClipboardDelegate::RendererClipboardDelegate() {
+}
+
+uint64 RendererClipboardDelegate::GetSequenceNumber(ui::ClipboardType type) {
+  uint64 sequence_number = 0;
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_GetSequenceNumber(type, &sequence_number));
+  return sequence_number;
+}
+
+bool RendererClipboardDelegate::IsFormatAvailable(
+    content::ClipboardFormat format,
+    ui::ClipboardType type) {
+  bool result = false;
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_IsFormatAvailable(format, type, &result));
+  return result;
+}
+
+void RendererClipboardDelegate::Clear(ui::ClipboardType type) {
+  RenderThreadImpl::current()->Send(new ClipboardHostMsg_Clear(type));
+}
+
+void RendererClipboardDelegate::ReadAvailableTypes(
+    ui::ClipboardType type,
+    std::vector<base::string16>* types,
+    bool* contains_filenames) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_ReadAvailableTypes(type, types, contains_filenames));
+}
+
+void RendererClipboardDelegate::ReadText(ui::ClipboardType type,
+                                         base::string16* result) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_ReadText(type, result));
+}
+
+void RendererClipboardDelegate::ReadHTML(ui::ClipboardType type,
+                                         base::string16* markup,
+                                         GURL* url,
+                                         uint32* fragment_start,
+                                         uint32* fragment_end) {
+  RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadHTML(
+      type, markup, url, fragment_start, fragment_end));
+}
+
+void RendererClipboardDelegate::ReadRTF(ui::ClipboardType type,
+                                        std::string* result) {
+  RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadRTF(type, result));
+}
+
+void RendererClipboardDelegate::ReadImage(ui::ClipboardType type,
+                                          std::string* data) {
+  base::SharedMemoryHandle image_handle;
+  uint32 image_size = 0;
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_ReadImage(type, &image_handle, &image_size));
+  if (base::SharedMemory::IsHandleValid(image_handle)) {
+    base::SharedMemory buffer(image_handle, true);
+    buffer.Map(image_size);
+    data->append(static_cast<char*>(buffer.memory()), image_size);
+  }
+}
+
+void RendererClipboardDelegate::ReadCustomData(ui::ClipboardType clipboard_type,
+                                               const base::string16& type,
+                                               base::string16* data) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_ReadCustomData(clipboard_type, type, data));
+}
+
+void RendererClipboardDelegate::WriteText(ui::ClipboardType clipboard_type,
+                                          const base::string16& text) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_WriteText(clipboard_type, text));
+}
+
+void RendererClipboardDelegate::WriteHTML(ui::ClipboardType clipboard_type,
+                                          const base::string16& markup,
+                                          const GURL& url) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_WriteHTML(clipboard_type, markup, url));
+}
+
+void RendererClipboardDelegate::WriteSmartPasteMarker(
+    ui::ClipboardType clipboard_type) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_WriteSmartPasteMarker(clipboard_type));
+}
+
+void RendererClipboardDelegate::WriteCustomData(
+    ui::ClipboardType clipboard_type,
+    const std::map<base::string16, base::string16>& data) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_WriteCustomData(clipboard_type, data));
+}
+
+void RendererClipboardDelegate::WriteBookmark(ui::ClipboardType clipboard_type,
+                                              const GURL& url,
+                                              const base::string16& title) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_WriteBookmark(clipboard_type, url, title));
+}
+
+bool RendererClipboardDelegate::WriteImage(ui::ClipboardType clipboard_type,
+                                           const SkBitmap& bitmap) {
+  // Only 32-bit bitmaps are supported.
+  DCHECK_EQ(bitmap.colorType(), kN32_SkColorType);
+
+  const gfx::Size size(bitmap.width(), bitmap.height());
+  scoped_ptr<base::SharedMemory> shared_buf;
+  {
+    SkAutoLockPixels locked(bitmap);
+    void* pixels = bitmap.getPixels();
+    // TODO(piman): this should not be NULL, but it is. crbug.com/369621
+    if (!pixels)
+      return false;
+
+    base::CheckedNumeric<uint32> checked_buf_size = 4;
+    checked_buf_size *= size.width();
+    checked_buf_size *= size.height();
+    if (!checked_buf_size.IsValid())
+      return false;
+
+    // Allocate a shared memory buffer to hold the bitmap bits.
+    uint32 buf_size = checked_buf_size.ValueOrDie();
+    shared_buf.reset(ChildThread::current()->AllocateSharedMemory(buf_size));
+    if (!shared_buf)
+      return false;
+    // Copy the bits into shared memory
+    DCHECK(shared_buf->memory());
+    memcpy(shared_buf->memory(), pixels, buf_size);
+    shared_buf->Unmap();
+  }
+
+  RenderThreadImpl::current()->Send(new ClipboardHostMsg_WriteImage(
+      clipboard_type, size, shared_buf->handle()));
+  return true;
+}
+
+void RendererClipboardDelegate::CommitWrite(ui::ClipboardType clipboard_type) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_CommitWrite(clipboard_type));
+}
+
+}  // namespace content