OLD | NEW |
| (Empty) |
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 #include "remoting/capturer/video_frame_capturer.h" | |
6 | |
7 #include <windows.h> | |
8 | |
9 #include "base/bind.h" | |
10 #include "base/bind_helpers.h" | |
11 #include "base/file_path.h" | |
12 #include "base/logging.h" | |
13 #include "base/memory/scoped_ptr.h" | |
14 #include "base/scoped_native_library.h" | |
15 #include "base/stl_util.h" | |
16 #include "base/time.h" | |
17 #include "base/utf_string_conversions.h" | |
18 #include "base/win/scoped_gdi_object.h" | |
19 #include "base/win/scoped_hdc.h" | |
20 #include "remoting/capturer/capture_data.h" | |
21 #include "remoting/capturer/differ.h" | |
22 #include "remoting/capturer/mouse_cursor_shape.h" | |
23 #include "remoting/capturer/shared_buffer_factory.h" | |
24 #include "remoting/capturer/video_frame.h" | |
25 #include "remoting/capturer/video_frame_capturer_helper.h" | |
26 #include "remoting/capturer/video_frame_queue.h" | |
27 #include "remoting/capturer/win/desktop.h" | |
28 #include "remoting/capturer/win/scoped_thread_desktop.h" | |
29 #include "third_party/skia/include/core/SkColorPriv.h" | |
30 | |
31 namespace remoting { | |
32 | |
33 namespace { | |
34 | |
35 // Constants from dwmapi.h. | |
36 const UINT DWM_EC_DISABLECOMPOSITION = 0; | |
37 const UINT DWM_EC_ENABLECOMPOSITION = 1; | |
38 | |
39 typedef HRESULT (WINAPI * DwmEnableCompositionFunc)(UINT); | |
40 | |
41 const char kDwmapiLibraryName[] = "dwmapi"; | |
42 | |
43 // Pixel colors used when generating cursor outlines. | |
44 const uint32 kPixelBgraBlack = 0xff000000; | |
45 const uint32 kPixelBgraWhite = 0xffffffff; | |
46 const uint32 kPixelBgraTransparent = 0x00000000; | |
47 | |
48 // A class representing a full-frame pixel buffer. | |
49 class VideoFrameWin : public VideoFrame { | |
50 public: | |
51 VideoFrameWin(HDC desktop_dc, const SkISize& size, | |
52 SharedBufferFactory* shared_buffer_factory); | |
53 virtual ~VideoFrameWin(); | |
54 | |
55 // Returns handle of the device independent bitmap representing this frame | |
56 // buffer to GDI. | |
57 HBITMAP GetBitmap(); | |
58 | |
59 private: | |
60 // Allocates a device independent bitmap representing this frame buffer to | |
61 // GDI. | |
62 void AllocateBitmap(HDC desktop_dc, const SkISize& size); | |
63 | |
64 // Handle of the device independent bitmap representing this frame buffer to | |
65 // GDI. | |
66 base::win::ScopedBitmap bitmap_; | |
67 | |
68 // Used to allocate shared memory buffers if set. | |
69 SharedBufferFactory* shared_buffer_factory_; | |
70 | |
71 DISALLOW_COPY_AND_ASSIGN(VideoFrameWin); | |
72 }; | |
73 | |
74 // VideoFrameCapturerWin captures 32bit RGB using GDI. | |
75 // | |
76 // VideoFrameCapturerWin is double-buffered as required by VideoFrameCapturer. | |
77 // See remoting/host/video_frame_capturer.h. | |
78 class VideoFrameCapturerWin : public VideoFrameCapturer { | |
79 public: | |
80 VideoFrameCapturerWin(); | |
81 explicit VideoFrameCapturerWin(SharedBufferFactory* shared_buffer_factory); | |
82 virtual ~VideoFrameCapturerWin(); | |
83 | |
84 // Overridden from VideoFrameCapturer: | |
85 virtual void Start(Delegate* delegate) OVERRIDE; | |
86 virtual void Stop() OVERRIDE; | |
87 virtual void InvalidateRegion(const SkRegion& invalid_region) OVERRIDE; | |
88 virtual void CaptureFrame() OVERRIDE; | |
89 | |
90 private: | |
91 // Make sure that the device contexts match the screen configuration. | |
92 void PrepareCaptureResources(); | |
93 | |
94 // Creates a CaptureData instance wrapping the current framebuffer and | |
95 // notifies |delegate_|. | |
96 void CaptureRegion(const SkRegion& region, | |
97 const base::Time& capture_start_time); | |
98 | |
99 // Captures the current screen contents into the current buffer. | |
100 void CaptureImage(); | |
101 | |
102 // Expand the cursor shape to add a white outline for visibility against | |
103 // dark backgrounds. | |
104 void AddCursorOutline(int width, int height, uint32* dst); | |
105 | |
106 // Capture the current cursor shape. | |
107 void CaptureCursor(); | |
108 | |
109 // Used to allocate shared memory buffers if set. | |
110 SharedBufferFactory* shared_buffer_factory_; | |
111 | |
112 Delegate* delegate_; | |
113 | |
114 // A thread-safe list of invalid rectangles, and the size of the most | |
115 // recently captured screen. | |
116 VideoFrameCapturerHelper helper_; | |
117 | |
118 // Snapshot of the last cursor bitmap we sent to the client. This is used | |
119 // to diff against the current cursor so we only send a cursor-change | |
120 // message when the shape has changed. | |
121 MouseCursorShape last_cursor_; | |
122 | |
123 ScopedThreadDesktop desktop_; | |
124 | |
125 // GDI resources used for screen capture. | |
126 scoped_ptr<base::win::ScopedGetDC> desktop_dc_; | |
127 base::win::ScopedCreateDC memory_dc_; | |
128 | |
129 // Queue of the frames buffers. | |
130 VideoFrameQueue queue_; | |
131 | |
132 // Rectangle describing the bounds of the desktop device context. | |
133 SkIRect desktop_dc_rect_; | |
134 | |
135 // Class to calculate the difference between two screen bitmaps. | |
136 scoped_ptr<Differ> differ_; | |
137 | |
138 base::ScopedNativeLibrary dwmapi_library_; | |
139 DwmEnableCompositionFunc composition_func_; | |
140 | |
141 DISALLOW_COPY_AND_ASSIGN(VideoFrameCapturerWin); | |
142 }; | |
143 | |
144 // 3780 pixels per meter is equivalent to 96 DPI, typical on desktop monitors. | |
145 static const int kPixelsPerMeter = 3780; | |
146 | |
147 VideoFrameWin::VideoFrameWin( | |
148 HDC desktop_dc, | |
149 const SkISize& size, | |
150 SharedBufferFactory* shared_buffer_factory) | |
151 : shared_buffer_factory_(shared_buffer_factory) { | |
152 // Allocate a shared memory buffer. | |
153 uint32 buffer_size = | |
154 size.width() * size.height() * CaptureData::kBytesPerPixel; | |
155 if (shared_buffer_factory_) { | |
156 scoped_refptr<SharedBuffer> shared_buffer = | |
157 shared_buffer_factory_->CreateSharedBuffer(buffer_size); | |
158 CHECK(shared_buffer->ptr() != NULL); | |
159 set_shared_buffer(shared_buffer); | |
160 } | |
161 | |
162 AllocateBitmap(desktop_dc, size); | |
163 } | |
164 | |
165 VideoFrameWin::~VideoFrameWin() { | |
166 if (shared_buffer()) | |
167 shared_buffer_factory_->ReleaseSharedBuffer(shared_buffer()); | |
168 } | |
169 | |
170 HBITMAP VideoFrameWin::GetBitmap() { | |
171 return bitmap_; | |
172 } | |
173 | |
174 void VideoFrameWin::AllocateBitmap(HDC desktop_dc, const SkISize& size) { | |
175 int bytes_per_row = size.width() * CaptureData::kBytesPerPixel; | |
176 | |
177 // Describe a device independent bitmap (DIB) that is the size of the desktop. | |
178 BITMAPINFO bmi; | |
179 memset(&bmi, 0, sizeof(bmi)); | |
180 bmi.bmiHeader.biHeight = -size.height(); | |
181 bmi.bmiHeader.biWidth = size.width(); | |
182 bmi.bmiHeader.biPlanes = 1; | |
183 bmi.bmiHeader.biBitCount = CaptureData::kBytesPerPixel * 8; | |
184 bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader); | |
185 bmi.bmiHeader.biSizeImage = bytes_per_row * size.height(); | |
186 bmi.bmiHeader.biXPelsPerMeter = kPixelsPerMeter; | |
187 bmi.bmiHeader.biYPelsPerMeter = kPixelsPerMeter; | |
188 | |
189 // Create the DIB, and store a pointer to its pixel buffer. | |
190 HANDLE section_handle = NULL; | |
191 if (shared_buffer()) | |
192 section_handle = shared_buffer()->handle(); | |
193 void* data = NULL; | |
194 bitmap_ = CreateDIBSection(desktop_dc, &bmi, DIB_RGB_COLORS, &data, | |
195 section_handle, 0); | |
196 | |
197 // TODO(wez): Cope gracefully with failure (crbug.com/157170). | |
198 CHECK(bitmap_ != NULL); | |
199 CHECK(data != NULL); | |
200 | |
201 set_pixels(reinterpret_cast<uint8*>(data)); | |
202 set_dimensions(SkISize::Make(bmi.bmiHeader.biWidth, | |
203 std::abs(bmi.bmiHeader.biHeight))); | |
204 set_bytes_per_row( | |
205 bmi.bmiHeader.biSizeImage / std::abs(bmi.bmiHeader.biHeight)); | |
206 } | |
207 | |
208 VideoFrameCapturerWin::VideoFrameCapturerWin() | |
209 : shared_buffer_factory_(NULL), | |
210 delegate_(NULL), | |
211 desktop_dc_rect_(SkIRect::MakeEmpty()), | |
212 composition_func_(NULL) { | |
213 } | |
214 | |
215 VideoFrameCapturerWin::VideoFrameCapturerWin( | |
216 SharedBufferFactory* shared_buffer_factory) | |
217 : shared_buffer_factory_(shared_buffer_factory), | |
218 delegate_(NULL), | |
219 desktop_dc_rect_(SkIRect::MakeEmpty()), | |
220 composition_func_(NULL) { | |
221 } | |
222 | |
223 VideoFrameCapturerWin::~VideoFrameCapturerWin() { | |
224 } | |
225 | |
226 void VideoFrameCapturerWin::InvalidateRegion(const SkRegion& invalid_region) { | |
227 helper_.InvalidateRegion(invalid_region); | |
228 } | |
229 | |
230 void VideoFrameCapturerWin::CaptureFrame() { | |
231 base::Time capture_start_time = base::Time::Now(); | |
232 | |
233 // Force the system to power-up display hardware, if it has been suspended. | |
234 SetThreadExecutionState(ES_DISPLAY_REQUIRED); | |
235 | |
236 // Make sure the GDI capture resources are up-to-date. | |
237 PrepareCaptureResources(); | |
238 | |
239 // Copy screen bits to the current buffer. | |
240 CaptureImage(); | |
241 | |
242 const VideoFrame* current_buffer = queue_.current_frame(); | |
243 const VideoFrame* last_buffer = queue_.previous_frame(); | |
244 if (last_buffer) { | |
245 // Make sure the differencer is set up correctly for these previous and | |
246 // current screens. | |
247 if (!differ_.get() || | |
248 (differ_->width() != current_buffer->dimensions().width()) || | |
249 (differ_->height() != current_buffer->dimensions().height()) || | |
250 (differ_->bytes_per_row() != current_buffer->bytes_per_row())) { | |
251 differ_.reset(new Differ(current_buffer->dimensions().width(), | |
252 current_buffer->dimensions().height(), | |
253 CaptureData::kBytesPerPixel, | |
254 current_buffer->bytes_per_row())); | |
255 } | |
256 | |
257 // Calculate difference between the two last captured frames. | |
258 SkRegion region; | |
259 differ_->CalcDirtyRegion(last_buffer->pixels(), current_buffer->pixels(), | |
260 ®ion); | |
261 InvalidateRegion(region); | |
262 } else { | |
263 // No previous frame is available. Invalidate the whole screen. | |
264 helper_.InvalidateScreen(current_buffer->dimensions()); | |
265 } | |
266 | |
267 // Wrap the captured frame into CaptureData structure and invoke | |
268 // the completion callback. | |
269 SkRegion invalid_region; | |
270 helper_.SwapInvalidRegion(&invalid_region); | |
271 CaptureRegion(invalid_region, capture_start_time); | |
272 | |
273 // Check for cursor shape update. | |
274 CaptureCursor(); | |
275 } | |
276 | |
277 void VideoFrameCapturerWin::Start(Delegate* delegate) { | |
278 DCHECK(delegate_ == NULL); | |
279 | |
280 delegate_ = delegate; | |
281 | |
282 // Load dwmapi.dll dynamically since it is not available on XP. | |
283 if (!dwmapi_library_.is_valid()) { | |
284 FilePath path(base::GetNativeLibraryName(UTF8ToUTF16(kDwmapiLibraryName))); | |
285 dwmapi_library_.Reset(base::LoadNativeLibrary(path, NULL)); | |
286 } | |
287 | |
288 if (dwmapi_library_.is_valid() && composition_func_ == NULL) { | |
289 composition_func_ = static_cast<DwmEnableCompositionFunc>( | |
290 dwmapi_library_.GetFunctionPointer("DwmEnableComposition")); | |
291 } | |
292 | |
293 // Vote to disable Aero composited desktop effects while capturing. Windows | |
294 // will restore Aero automatically if the process exits. This has no effect | |
295 // under Windows 8 or higher. See crbug.com/124018. | |
296 if (composition_func_ != NULL) { | |
297 (*composition_func_)(DWM_EC_DISABLECOMPOSITION); | |
298 } | |
299 } | |
300 | |
301 void VideoFrameCapturerWin::Stop() { | |
302 // Restore Aero. | |
303 if (composition_func_ != NULL) { | |
304 (*composition_func_)(DWM_EC_ENABLECOMPOSITION); | |
305 } | |
306 | |
307 delegate_ = NULL; | |
308 } | |
309 | |
310 void VideoFrameCapturerWin::PrepareCaptureResources() { | |
311 // Switch to the desktop receiving user input if different from the current | |
312 // one. | |
313 scoped_ptr<Desktop> input_desktop = Desktop::GetInputDesktop(); | |
314 if (input_desktop.get() != NULL && !desktop_.IsSame(*input_desktop)) { | |
315 // Release GDI resources otherwise SetThreadDesktop will fail. | |
316 desktop_dc_.reset(); | |
317 memory_dc_.Set(NULL); | |
318 | |
319 // If SetThreadDesktop() fails, the thread is still assigned a desktop. | |
320 // So we can continue capture screen bits, just from the wrong desktop. | |
321 desktop_.SetThreadDesktop(input_desktop.Pass()); | |
322 } | |
323 | |
324 // If the display bounds have changed then recreate GDI resources. | |
325 // TODO(wez): Also check for pixel format changes. | |
326 SkIRect screen_rect(SkIRect::MakeXYWH( | |
327 GetSystemMetrics(SM_XVIRTUALSCREEN), | |
328 GetSystemMetrics(SM_YVIRTUALSCREEN), | |
329 GetSystemMetrics(SM_CXVIRTUALSCREEN), | |
330 GetSystemMetrics(SM_CYVIRTUALSCREEN))); | |
331 if (screen_rect != desktop_dc_rect_) { | |
332 desktop_dc_.reset(); | |
333 memory_dc_.Set(NULL); | |
334 desktop_dc_rect_.setEmpty(); | |
335 } | |
336 | |
337 if (desktop_dc_.get() == NULL) { | |
338 DCHECK(memory_dc_.Get() == NULL); | |
339 | |
340 // Create GDI device contexts to capture from the desktop into memory. | |
341 desktop_dc_.reset(new base::win::ScopedGetDC(NULL)); | |
342 memory_dc_.Set(CreateCompatibleDC(*desktop_dc_)); | |
343 desktop_dc_rect_ = screen_rect; | |
344 | |
345 // Make sure the frame buffers will be reallocated. | |
346 queue_.SetAllFramesNeedUpdate(); | |
347 | |
348 helper_.ClearInvalidRegion(); | |
349 } | |
350 } | |
351 | |
352 void VideoFrameCapturerWin::CaptureRegion( | |
353 const SkRegion& region, | |
354 const base::Time& capture_start_time) { | |
355 const VideoFrame* current_buffer = queue_.current_frame(); | |
356 | |
357 scoped_refptr<CaptureData> data( | |
358 new CaptureData(current_buffer->pixels(), current_buffer->bytes_per_row(), | |
359 current_buffer->dimensions())); | |
360 data->mutable_dirty_region() = region; | |
361 data->set_shared_buffer(current_buffer->shared_buffer()); | |
362 | |
363 helper_.set_size_most_recent(data->size()); | |
364 | |
365 queue_.DoneWithCurrentFrame(); | |
366 | |
367 data->set_capture_time_ms( | |
368 (base::Time::Now() - capture_start_time).InMillisecondsRoundedUp()); | |
369 delegate_->OnCaptureCompleted(data); | |
370 } | |
371 | |
372 void VideoFrameCapturerWin::CaptureImage() { | |
373 // If the current buffer is from an older generation then allocate a new one. | |
374 // Note that we can't reallocate other buffers at this point, since the caller | |
375 // may still be reading from them. | |
376 if (queue_.current_frame_needs_update()) { | |
377 DCHECK(desktop_dc_.get() != NULL); | |
378 DCHECK(memory_dc_.Get() != NULL); | |
379 | |
380 SkISize size = SkISize::Make(desktop_dc_rect_.width(), | |
381 desktop_dc_rect_.height()); | |
382 scoped_ptr<VideoFrameWin> buffer( | |
383 new VideoFrameWin(*desktop_dc_, size, shared_buffer_factory_)); | |
384 queue_.ReplaceCurrentFrame(buffer.PassAs<VideoFrame>()); | |
385 } | |
386 | |
387 // Select the target bitmap into the memory dc and copy the rect from desktop | |
388 // to memory. | |
389 VideoFrameWin* current = static_cast<VideoFrameWin*>(queue_.current_frame()); | |
390 HGDIOBJ previous_object = SelectObject(memory_dc_, current->GetBitmap()); | |
391 if (previous_object != NULL) { | |
392 BitBlt(memory_dc_, | |
393 0, 0, desktop_dc_rect_.width(), desktop_dc_rect_.height(), | |
394 *desktop_dc_, | |
395 desktop_dc_rect_.x(), desktop_dc_rect_.y(), | |
396 SRCCOPY | CAPTUREBLT); | |
397 | |
398 // Select back the previously selected object to that the device contect | |
399 // could be destroyed independently of the bitmap if needed. | |
400 SelectObject(memory_dc_, previous_object); | |
401 } | |
402 } | |
403 | |
404 void VideoFrameCapturerWin::AddCursorOutline(int width, | |
405 int height, | |
406 uint32* dst) { | |
407 for (int y = 0; y < height; y++) { | |
408 for (int x = 0; x < width; x++) { | |
409 // If this is a transparent pixel (bgr == 0 and alpha = 0), check the | |
410 // neighbor pixels to see if this should be changed to an outline pixel. | |
411 if (*dst == kPixelBgraTransparent) { | |
412 // Change to white pixel if any neighbors (top, bottom, left, right) | |
413 // are black. | |
414 if ((y > 0 && dst[-width] == kPixelBgraBlack) || | |
415 (y < height - 1 && dst[width] == kPixelBgraBlack) || | |
416 (x > 0 && dst[-1] == kPixelBgraBlack) || | |
417 (x < width - 1 && dst[1] == kPixelBgraBlack)) { | |
418 *dst = kPixelBgraWhite; | |
419 } | |
420 } | |
421 dst++; | |
422 } | |
423 } | |
424 } | |
425 | |
426 void VideoFrameCapturerWin::CaptureCursor() { | |
427 CURSORINFO cursor_info; | |
428 cursor_info.cbSize = sizeof(CURSORINFO); | |
429 if (!GetCursorInfo(&cursor_info)) { | |
430 VLOG(3) << "Unable to get cursor info. Error = " << GetLastError(); | |
431 return; | |
432 } | |
433 | |
434 // Note that this does not need to be freed. | |
435 HCURSOR hcursor = cursor_info.hCursor; | |
436 ICONINFO iinfo; | |
437 if (!GetIconInfo(hcursor, &iinfo)) { | |
438 VLOG(3) << "Unable to get cursor icon info. Error = " << GetLastError(); | |
439 return; | |
440 } | |
441 int hotspot_x = iinfo.xHotspot; | |
442 int hotspot_y = iinfo.yHotspot; | |
443 | |
444 // Get the cursor bitmap. | |
445 base::win::ScopedBitmap hbitmap; | |
446 BITMAP bitmap; | |
447 bool color_bitmap; | |
448 if (iinfo.hbmColor) { | |
449 // Color cursor bitmap. | |
450 color_bitmap = true; | |
451 hbitmap.Set((HBITMAP)CopyImage(iinfo.hbmColor, IMAGE_BITMAP, 0, 0, | |
452 LR_CREATEDIBSECTION)); | |
453 if (!hbitmap.Get()) { | |
454 VLOG(3) << "Unable to copy color cursor image. Error = " | |
455 << GetLastError(); | |
456 return; | |
457 } | |
458 | |
459 // Free the color and mask bitmaps since we only need our copy. | |
460 DeleteObject(iinfo.hbmColor); | |
461 DeleteObject(iinfo.hbmMask); | |
462 } else { | |
463 // Black and white (xor) cursor. | |
464 color_bitmap = false; | |
465 hbitmap.Set(iinfo.hbmMask); | |
466 } | |
467 | |
468 if (!GetObject(hbitmap.Get(), sizeof(BITMAP), &bitmap)) { | |
469 VLOG(3) << "Unable to get cursor bitmap. Error = " << GetLastError(); | |
470 return; | |
471 } | |
472 | |
473 int width = bitmap.bmWidth; | |
474 int height = bitmap.bmHeight; | |
475 // For non-color cursors, the mask contains both an AND and an XOR mask and | |
476 // the height includes both. Thus, the width is correct, but we need to | |
477 // divide by 2 to get the correct mask height. | |
478 if (!color_bitmap) { | |
479 height /= 2; | |
480 } | |
481 int data_size = height * width * CaptureData::kBytesPerPixel; | |
482 | |
483 scoped_ptr<MouseCursorShape> cursor(new MouseCursorShape()); | |
484 cursor->data.resize(data_size); | |
485 uint8* cursor_dst_data = | |
486 reinterpret_cast<uint8*>(string_as_array(&cursor->data)); | |
487 | |
488 // Copy/convert cursor bitmap into format needed by chromotocol. | |
489 int row_bytes = bitmap.bmWidthBytes; | |
490 if (color_bitmap) { | |
491 if (bitmap.bmPlanes != 1 || bitmap.bmBitsPixel != 32) { | |
492 VLOG(3) << "Unsupported color cursor format. Error = " << GetLastError(); | |
493 return; | |
494 } | |
495 | |
496 // Copy across colour cursor imagery. | |
497 // MouseCursorShape stores imagery top-down, and premultiplied | |
498 // by the alpha channel, whereas windows stores them bottom-up | |
499 // and not premultiplied. | |
500 uint8* cursor_src_data = reinterpret_cast<uint8*>(bitmap.bmBits); | |
501 uint8* src = cursor_src_data + ((height - 1) * row_bytes); | |
502 uint8* dst = cursor_dst_data; | |
503 for (int row = 0; row < height; ++row) { | |
504 for (int column = 0; column < width; ++column) { | |
505 dst[0] = SkAlphaMul(src[0], src[3]); | |
506 dst[1] = SkAlphaMul(src[1], src[3]); | |
507 dst[2] = SkAlphaMul(src[2], src[3]); | |
508 dst[3] = src[3]; | |
509 dst += CaptureData::kBytesPerPixel; | |
510 src += CaptureData::kBytesPerPixel; | |
511 } | |
512 src -= row_bytes + (width * CaptureData::kBytesPerPixel); | |
513 } | |
514 } else { | |
515 if (bitmap.bmPlanes != 1 || bitmap.bmBitsPixel != 1) { | |
516 VLOG(3) << "Unsupported cursor mask format. Error = " << GetLastError(); | |
517 return; | |
518 } | |
519 | |
520 // x2 because there are 2 masks in the bitmap: AND and XOR. | |
521 int mask_bytes = height * row_bytes * 2; | |
522 scoped_array<uint8> mask(new uint8[mask_bytes]); | |
523 if (!GetBitmapBits(hbitmap.Get(), mask_bytes, mask.get())) { | |
524 VLOG(3) << "Unable to get cursor mask bits. Error = " << GetLastError(); | |
525 return; | |
526 } | |
527 uint8* and_mask = mask.get(); | |
528 uint8* xor_mask = mask.get() + height * row_bytes; | |
529 uint8* dst = cursor_dst_data; | |
530 bool add_outline = false; | |
531 for (int y = 0; y < height; y++) { | |
532 for (int x = 0; x < width; x++) { | |
533 int byte = y * row_bytes + x / 8; | |
534 int bit = 7 - x % 8; | |
535 int and = and_mask[byte] & (1 << bit); | |
536 int xor = xor_mask[byte] & (1 << bit); | |
537 | |
538 // The two cursor masks combine as follows: | |
539 // AND XOR Windows Result Our result RGB Alpha | |
540 // 0 0 Black Black 00 ff | |
541 // 0 1 White White ff ff | |
542 // 1 0 Screen Transparent 00 00 | |
543 // 1 1 Reverse-screen Black 00 ff | |
544 // Since we don't support XOR cursors, we replace the "Reverse Screen" | |
545 // with black. In this case, we also add an outline around the cursor | |
546 // so that it is visible against a dark background. | |
547 int rgb = (!and && xor) ? 0xff : 0x00; | |
548 int alpha = (and && !xor) ? 0x00 : 0xff; | |
549 *dst++ = rgb; | |
550 *dst++ = rgb; | |
551 *dst++ = rgb; | |
552 *dst++ = alpha; | |
553 if (and && xor) { | |
554 add_outline = true; | |
555 } | |
556 } | |
557 } | |
558 if (add_outline) { | |
559 AddCursorOutline(width, height, | |
560 reinterpret_cast<uint32*>(cursor_dst_data)); | |
561 } | |
562 } | |
563 | |
564 cursor->size.set(width, height); | |
565 cursor->hotspot.set(hotspot_x, hotspot_y); | |
566 | |
567 // Compare the current cursor with the last one we sent to the client. If | |
568 // they're the same, then don't bother sending the cursor again. | |
569 if (last_cursor_.size == cursor->size && | |
570 last_cursor_.hotspot == cursor->hotspot && | |
571 last_cursor_.data == cursor->data) { | |
572 return; | |
573 } | |
574 | |
575 VLOG(3) << "Sending updated cursor: " << width << "x" << height; | |
576 | |
577 // Record the last cursor image that we sent to the client. | |
578 last_cursor_ = *cursor; | |
579 | |
580 delegate_->OnCursorShapeChanged(cursor.Pass()); | |
581 } | |
582 | |
583 } // namespace | |
584 | |
585 // static | |
586 scoped_ptr<VideoFrameCapturer> VideoFrameCapturer::Create() { | |
587 return scoped_ptr<VideoFrameCapturer>(new VideoFrameCapturerWin()); | |
588 } | |
589 | |
590 // static | |
591 scoped_ptr<VideoFrameCapturer> VideoFrameCapturer::CreateWithFactory( | |
592 SharedBufferFactory* shared_buffer_factory) { | |
593 scoped_ptr<VideoFrameCapturerWin> capturer( | |
594 new VideoFrameCapturerWin(shared_buffer_factory)); | |
595 return capturer.PassAs<VideoFrameCapturer>(); | |
596 } | |
597 | |
598 } // namespace remoting | |
OLD | NEW |