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Issue 740003003: Revert of Rewrite clipboard write IPC handling to be easier to understand. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 1 month ago
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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 ~RendererClipboardWriteContext() override;
27 void WriteBitmapFromPixels(ui::Clipboard::ObjectMap* objects,
28 const void* pixels,
29 const gfx::Size& size) override;
30 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
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