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/numerics/safe_math.h" 11 #include "base/strings/string16.h" 12 #include "content/common/clipboard_messages.h" 13 #include "content/public/renderer/content_renderer_client.h" 14 #include "content/renderer/render_thread_impl.h" 15 #include "content/renderer/scoped_clipboard_writer_glue.h" 16 #include "ui/base/clipboard/clipboard.h" 17 #include "ui/gfx/size.h" 18 19 namespace content { 20 21 namespace { 22 23 class RendererClipboardWriteContext : public ClipboardClient::WriteContext { 24 public: 25 RendererClipboardWriteContext(); 26 virtual ~RendererClipboardWriteContext(); 27 virtual void WriteBitmapFromPixels(ui::Clipboard::ObjectMap* objects, 28 const void* pixels, 29 const gfx::Size& size) OVERRIDE; 30 virtual void Flush(const ui::Clipboard::ObjectMap& objects) OVERRIDE; 31 32 private: 33 scoped_ptr<base::SharedMemory> shared_buf_; 34 DISALLOW_COPY_AND_ASSIGN(RendererClipboardWriteContext); 35 }; 36 37 RendererClipboardWriteContext::RendererClipboardWriteContext() { 38 } 39 40 RendererClipboardWriteContext::~RendererClipboardWriteContext() { 41 } 42 43 // This definition of WriteBitmapFromPixels uses shared memory to communicate 44 // across processes. 45 void RendererClipboardWriteContext::WriteBitmapFromPixels( 46 ui::Clipboard::ObjectMap* objects, 47 const void* pixels, 48 const gfx::Size& size) { 49 // Do not try to write a bitmap more than once 50 if (shared_buf_) 51 return; 52 53 base::CheckedNumeric<uint32> checked_buf_size = 4; 54 checked_buf_size *= size.width(); 55 checked_buf_size *= size.height(); 56 if (!checked_buf_size.IsValid()) 57 return; 58 59 uint32 buf_size = checked_buf_size.ValueOrDie(); 60 61 // Allocate a shared memory buffer to hold the bitmap bits. 62 shared_buf_.reset(ChildThread::current()->AllocateSharedMemory(buf_size)); 63 if (!shared_buf_) 64 return; 65 66 // Copy the bits into shared memory 67 DCHECK(shared_buf_->memory()); 68 memcpy(shared_buf_->memory(), pixels, buf_size); 69 shared_buf_->Unmap(); 70 71 ui::Clipboard::ObjectMapParam size_param; 72 const char* size_data = reinterpret_cast<const char*>(&size); 73 for (size_t i = 0; i < sizeof(gfx::Size); ++i) 74 size_param.push_back(size_data[i]); 75 76 ui::Clipboard::ObjectMapParams params; 77 78 // The first parameter is replaced on the receiving end with a pointer to 79 // a shared memory object containing the bitmap. We reserve space for it here. 80 ui::Clipboard::ObjectMapParam place_holder_param; 81 params.push_back(place_holder_param); 82 params.push_back(size_param); 83 (*objects)[ui::Clipboard::CBF_SMBITMAP] = params; 84 } 85 86 // Flushes the objects to the clipboard with an IPC. 87 void RendererClipboardWriteContext::Flush( 88 const ui::Clipboard::ObjectMap& objects) { 89 if (shared_buf_) { 90 RenderThreadImpl::current()->Send( 91 new ClipboardHostMsg_WriteObjectsSync(objects, shared_buf_->handle())); 92 } else { 93 RenderThreadImpl::current()->Send( 94 new ClipboardHostMsg_WriteObjectsAsync(objects)); 95 } 96 } 97 98 } // anonymous namespace 99 100 RendererClipboardClient::RendererClipboardClient() { 101 } 102 103 RendererClipboardClient::~RendererClipboardClient() { 104 } 105 106 ui::Clipboard* RendererClipboardClient::GetClipboard() { 107 return NULL; 108 } 109 110 uint64 RendererClipboardClient::GetSequenceNumber(ui::ClipboardType type) { 111 uint64 sequence_number = 0; 112 RenderThreadImpl::current()->Send( 113 new ClipboardHostMsg_GetSequenceNumber(type, &sequence_number)); 114 return sequence_number; 115 } 116 117 bool RendererClipboardClient::IsFormatAvailable(content::ClipboardFormat format, 118 ui::ClipboardType type) { 119 bool result = false; 120 RenderThreadImpl::current()->Send( 121 new ClipboardHostMsg_IsFormatAvailable(format, type, &result)); 122 return result; 123 } 124 125 void RendererClipboardClient::Clear(ui::ClipboardType type) { 126 RenderThreadImpl::current()->Send(new ClipboardHostMsg_Clear(type)); 127 } 128 129 void RendererClipboardClient::ReadAvailableTypes( 130 ui::ClipboardType type, 131 std::vector<base::string16>* types, 132 bool* contains_filenames) { 133 RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadAvailableTypes( 134 type, types, contains_filenames)); 135 } 136 137 void RendererClipboardClient::ReadText(ui::ClipboardType type, 138 base::string16* result) { 139 RenderThreadImpl::current()->Send( 140 new ClipboardHostMsg_ReadText(type, result)); 141 } 142 143 void RendererClipboardClient::ReadHTML(ui::ClipboardType type, 144 base::string16* markup, 145 GURL* url, uint32* fragment_start, 146 uint32* fragment_end) { 147 RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadHTML( 148 type, markup, url, fragment_start, fragment_end)); 149 } 150 151 void RendererClipboardClient::ReadRTF(ui::ClipboardType type, 152 std::string* result) { 153 RenderThreadImpl::current()->Send(new ClipboardHostMsg_ReadRTF(type, result)); 154 } 155 156 void RendererClipboardClient::ReadImage(ui::ClipboardType type, 157 std::string* data) { 158 base::SharedMemoryHandle image_handle; 159 uint32 image_size = 0; 160 RenderThreadImpl::current()->Send( 161 new ClipboardHostMsg_ReadImage(type, &image_handle, &image_size)); 162 if (base::SharedMemory::IsHandleValid(image_handle)) { 163 base::SharedMemory buffer(image_handle, true); 164 buffer.Map(image_size); 165 data->append(static_cast<char*>(buffer.memory()), image_size); 166 } 167 } 168 169 void RendererClipboardClient::ReadCustomData(ui::ClipboardType clipboard_type, 170 const base::string16& type, 171 base::string16* data) { 172 RenderThreadImpl::current()->Send( 173 new ClipboardHostMsg_ReadCustomData(clipboard_type, type, data)); 174 } 175 176 ClipboardClient::WriteContext* RendererClipboardClient::CreateWriteContext() { 177 return new RendererClipboardWriteContext; 178 } 179 180 } // namespace content 181