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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 #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 |
|---|
Chromium Code Reviews
Issue 12047101:
Move screen capturers from remoting/capturer to media/video/capturer/screen (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src