content/renderer/renderer_clipboard_client.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file provides the embedder's side of the Clipboard interface.
   6
   7 #include "content/renderer/renderer_clipboard_client.h"
   8
   9 #include "base/memory/shared_memory.h"
  10 #include "base/strings/string16.h"
  11 #include "content/common/clipboard_messages.h"
  12 #include "content/public/renderer/content_renderer_client.h"
  13 #include "content/renderer/render_thread_impl.h"
  14 #include "content/renderer/scoped_clipboard_writer_glue.h"
  15 #include "ui/base/clipboard/clipboard.h"
  16 #include "ui/gfx/size.h"
  17
  18 namespace content {
  19
  20 namespace {
  21
  22 class RendererClipboardWriteContext : public ClipboardClient::WriteContext {
  23  public:
  24   RendererClipboardWriteContext();
  25   virtual ~RendererClipboardWriteContext();
  26   virtual void WriteBitmapFromPixels(ui::Clipboard::ObjectMap* objects,
  27                                      const void* pixels,
  28                                      const gfx::Size& size) OVERRIDE;
  29   virtual void Flush(const ui::Clipboard::ObjectMap& objects) OVERRIDE;
  30
  31  private:
  32   scoped_ptr<base::SharedMemory> shared_buf_;
  33   DISALLOW_COPY_AND_ASSIGN(RendererClipboardWriteContext);
  34 };
  35
  36 RendererClipboardWriteContext::RendererClipboardWriteContext() {
  37 }
  38
  39 RendererClipboardWriteContext::~RendererClipboardWriteContext() {
  40 }
  41
  42 // This definition of WriteBitmapFromPixels uses shared memory to communicate
  43 // across processes.
  44 void RendererClipboardWriteContext::WriteBitmapFromPixels(
  45     ui::Clipboard::ObjectMap* objects,
  46     const void* pixels,
  47     const gfx::Size& size) {
  48   // Do not try to write a bitmap more than once
  49   if (shared_buf_)
  50     return;
  51
  52   uint32 buf_size = 4 * size.width() * size.height();
  53
  54   // Allocate a shared memory buffer to hold the bitmap bits.
  55   shared_buf_.reset(ChildThread::current()->AllocateSharedMemory(buf_size));
  56   if (!shared_buf_)
  57     return;
  58
  59   // Copy the bits into shared memory
  60   DCHECK(shared_buf_->memory());
  61   memcpy(shared_buf_->memory(), pixels, buf_size);
  62   shared_buf_->Unmap();
  63
  64   ui::Clipboard::ObjectMapParam size_param;
  65   const char* size_data = reinterpret_cast<const char*>(&size);
  66   for (size_t i = 0; i < sizeof(gfx::Size); ++i)
  67     size_param.push_back(size_data[i]);
  68
  69   ui::Clipboard::ObjectMapParams params;
  70
  71   // The first parameter is replaced on the receiving end with a pointer to
  72   // a shared memory object containing the bitmap. We reserve space for it here.
  73   ui::Clipboard::ObjectMapParam place_holder_param;
  74   params.push_back(place_holder_param);
  75   params.push_back(size_param);
  76   (*objects)[ui::Clipboard::CBF_SMBITMAP] = params;
  77 }
  78
  79 // Flushes the objects to the clipboard with an IPC.
  80 void RendererClipboardWriteContext::Flush(
  81     const ui::Clipboard::ObjectMap& objects) {
  82   if (shared_buf_) {
  83     RenderThreadImpl::current()->Send(
  84         new ClipboardHostMsg_WriteObjectsSync(objects, shared_buf_->handle()));
  85   } else {
  86     RenderThreadImpl::current()->Send(
  87         new ClipboardHostMsg_WriteObjectsAsync(objects));
  88   }
  89 }
  90
  91 }  // anonymous namespace
  92
  93 RendererClipboardClient::RendererClipboardClient() {
  94 }
  95
  96 RendererClipboardClient::~RendererClipboardClient() {
  97 }
  98
  99 ui::Clipboard* RendererClipboardClient::GetClipboard() {
 100   return NULL;
 101 }
 102
 103 uint64 RendererClipboardClient::GetSequenceNumber(ui::ClipboardType type) {
 104   uint64 sequence_number = 0;
 105   RenderThreadImpl::current()->Send(
 106       new ClipboardHostMsg_GetSequenceNumber(type, &sequence_number));
 107   return sequence_number;
 108 }
 109
 110 bool RendererClipboardClient::IsFormatAvailable(content::ClipboardFormat format,
 111                                                 ui::ClipboardType type) {
 112   bool result;
 113   RenderThreadImpl::current()->Send(
 114       new ClipboardHostMsg_IsFormatAvailable(format, type, &result));
 115   return result;
 116 }
 117
 118 void RendererClipboardClient::Clear(ui::ClipboardType type) {
 119   RenderThreadImpl::current()->Send(new ClipboardHostMsg_Clear(type));
 120 }
 121
 122 void RendererClipboardClient::ReadAvailableTypes(
 123     ui::ClipboardType type,
 124     std::vector<base::string16>* types,
 125     bool* contains_filenames) {
 126   RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadAvailableTypes(
 127       type, types, contains_filenames));
 128 }
 129
 130 void RendererClipboardClient::ReadText(ui::ClipboardType type,
 131                                        base::string16* result) {
 132   RenderThreadImpl::current()->Send(
 133       new ClipboardHostMsg_ReadText(type, result));
 134 }
 135
 136 void RendererClipboardClient::ReadHTML(ui::ClipboardType type,
 137                                        base::string16* markup,
 138                                        GURL* url, uint32* fragment_start,
 139                                        uint32* fragment_end) {
 140   RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadHTML(
 141       type, markup, url, fragment_start, fragment_end));
 142 }
 143
 144 void RendererClipboardClient::ReadRTF(ui::ClipboardType type,
 145                                       std::string* result) {
 146   RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadRTF(type, result));
 147 }
 148
 149 void RendererClipboardClient::ReadImage(ui::ClipboardType type,
 150                                         std::string* data) {
 151   base::SharedMemoryHandle image_handle;
 152   uint32 image_size;
 153   RenderThreadImpl::current()->Send(
 154       new ClipboardHostMsg_ReadImage(type, &image_handle, &image_size));
 155   if (base::SharedMemory::IsHandleValid(image_handle)) {
 156     base::SharedMemory buffer(image_handle, true);
 157     buffer.Map(image_size);
 158     data->append(static_cast<char*>(buffer.memory()), image_size);
 159   }
 160 }
 161
 162 void RendererClipboardClient::ReadCustomData(ui::ClipboardType clipboard_type,
 163                                              const base::string16& type,
 164                                              base::string16* data) {
 165   RenderThreadImpl::current()->Send(
 166       new ClipboardHostMsg_ReadCustomData(clipboard_type, type, data));
 167 }
 168
 169 ClipboardClient::WriteContext* RendererClipboardClient::CreateWriteContext() {
 170   return new RendererClipboardWriteContext;
 171 }
 172
 173 }  // namespace content