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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 "media/video/capture/screen/screen_capturer.h" | |
| 6 | |
| 7 #include <windows.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/memory/scoped_ptr.h" | |
| 11 #include "base/time.h" | |
| 12 #include "media/video/capture/screen/differ.h" | |
| 13 #include "media/video/capture/screen/mouse_cursor_shape.h" | |
| 14 #include "media/video/capture/screen/screen_capture_frame_queue.h" | |
| 15 #include "media/video/capture/screen/screen_capturer_helper.h" | |
| 16 #include "media/video/capture/screen/win/desktop.h" | |
| 17 #include "media/video/capture/screen/win/scoped_thread_desktop.h" | |
| 18 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h" | |
| 19 #include "third_party/webrtc/modules/desktop_capture/desktop_frame_win.h" | |
| 20 #include "third_party/webrtc/modules/desktop_capture/desktop_region.h" | |
| 21 | |
| 22 namespace media { | |
| 23 | |
| 24 namespace { | |
| 25 | |
| 26 // Constants from dwmapi.h. | |
| 27 const UINT DWM_EC_DISABLECOMPOSITION = 0; | |
| 28 const UINT DWM_EC_ENABLECOMPOSITION = 1; | |
| 29 | |
| 30 typedef HRESULT (WINAPI * DwmEnableCompositionFunc)(UINT); | |
| 31 | |
| 32 const wchar_t kDwmapiLibraryName[] = L"dwmapi.dll"; | |
| 33 | |
| 34 // Pixel colors used when generating cursor outlines. | |
| 35 const uint32 kPixelBgraBlack = 0xff000000; | |
| 36 const uint32 kPixelBgraWhite = 0xffffffff; | |
| 37 const uint32 kPixelBgraTransparent = 0x00000000; | |
| 38 | |
| 39 uint8_t AlphaMul(uint8_t v, uint8_t alpha) { | |
| 40 return (static_cast<uint16_t>(v) * alpha) >> 8; | |
| 41 } | |
| 42 | |
| 43 // ScreenCapturerWin captures 32bit RGB using GDI. | |
| 44 // | |
| 45 // ScreenCapturerWin is double-buffered as required by ScreenCapturer. | |
| 46 class ScreenCapturerWin : public ScreenCapturer { | |
| 47 public: | |
| 48 ScreenCapturerWin(bool disable_aero); | |
| 49 virtual ~ScreenCapturerWin(); | |
| 50 | |
| 51 // Overridden from ScreenCapturer: | |
| 52 virtual void Start(Callback* callback) OVERRIDE; | |
| 53 virtual void Capture(const webrtc::DesktopRegion& region) OVERRIDE; | |
| 54 virtual void SetMouseShapeObserver( | |
| 55 MouseShapeObserver* mouse_shape_observer) OVERRIDE; | |
| 56 | |
| 57 private: | |
| 58 // Make sure that the device contexts match the screen configuration. | |
| 59 void PrepareCaptureResources(); | |
| 60 | |
| 61 // Captures the current screen contents into the current buffer. | |
| 62 void CaptureImage(); | |
| 63 | |
| 64 // Expand the cursor shape to add a white outline for visibility against | |
| 65 // dark backgrounds. | |
| 66 void AddCursorOutline(int width, int height, uint32* dst); | |
| 67 | |
| 68 // Capture the current cursor shape. | |
| 69 void CaptureCursor(); | |
| 70 | |
| 71 Callback* callback_; | |
| 72 MouseShapeObserver* mouse_shape_observer_; | |
| 73 | |
| 74 // A thread-safe list of invalid rectangles, and the size of the most | |
| 75 // recently captured screen. | |
| 76 ScreenCapturerHelper helper_; | |
| 77 | |
| 78 // Snapshot of the last cursor bitmap we sent to the client. This is used | |
| 79 // to diff against the current cursor so we only send a cursor-change | |
| 80 // message when the shape has changed. | |
| 81 MouseCursorShape last_cursor_; | |
| 82 | |
| 83 ScopedThreadDesktop desktop_; | |
| 84 | |
| 85 // GDI resources used for screen capture. | |
| 86 HDC desktop_dc_; | |
| 87 HDC memory_dc_; | |
| 88 | |
| 89 // Queue of the frames buffers. | |
| 90 ScreenCaptureFrameQueue queue_; | |
| 91 | |
| 92 // Rectangle describing the bounds of the desktop device context. | |
| 93 webrtc::DesktopRect desktop_dc_rect_; | |
| 94 | |
| 95 // Class to calculate the difference between two screen bitmaps. | |
| 96 scoped_ptr<Differ> differ_; | |
| 97 | |
| 98 HMODULE dwmapi_library_; | |
| 99 DwmEnableCompositionFunc composition_func_; | |
| 100 | |
| 101 // Used to suppress duplicate logging of SetThreadExecutionState errors. | |
| 102 bool set_thread_execution_state_failed_; | |
| 103 | |
| 104 DISALLOW_COPY_AND_ASSIGN(ScreenCapturerWin); | |
| 105 }; | |
| 106 | |
| 107 ScreenCapturerWin::ScreenCapturerWin(bool disable_aero) | |
| 108 : callback_(NULL), | |
| 109 mouse_shape_observer_(NULL), | |
| 110 desktop_dc_(NULL), | |
| 111 memory_dc_(NULL), | |
| 112 dwmapi_library_(NULL), | |
| 113 composition_func_(NULL), | |
| 114 set_thread_execution_state_failed_(false) { | |
| 115 if (disable_aero) { | |
| 116 // Load dwmapi.dll dynamically since it is not available on XP. | |
| 117 if (!dwmapi_library_) | |
| 118 dwmapi_library_ = LoadLibrary(kDwmapiLibraryName); | |
| 119 | |
| 120 if (dwmapi_library_) { | |
| 121 composition_func_ = reinterpret_cast<DwmEnableCompositionFunc>( | |
| 122 GetProcAddress(dwmapi_library_, "DwmEnableComposition")); | |
| 123 } | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 ScreenCapturerWin::~ScreenCapturerWin() { | |
| 128 if (desktop_dc_) | |
| 129 ReleaseDC(NULL, desktop_dc_); | |
| 130 if (memory_dc_) | |
| 131 DeleteDC(memory_dc_); | |
| 132 | |
| 133 // Restore Aero. | |
| 134 if (composition_func_) | |
| 135 (*composition_func_)(DWM_EC_ENABLECOMPOSITION); | |
| 136 | |
| 137 if (dwmapi_library_) | |
| 138 FreeLibrary(dwmapi_library_); | |
| 139 } | |
| 140 | |
| 141 void ScreenCapturerWin::Capture(const webrtc::DesktopRegion& region) { | |
| 142 base::Time capture_start_time = base::Time::Now(); | |
| 143 | |
| 144 queue_.MoveToNextFrame(); | |
| 145 | |
| 146 // Request that the system not power-down the system, or the display hardware. | |
| 147 if (!SetThreadExecutionState(ES_DISPLAY_REQUIRED | ES_SYSTEM_REQUIRED)) { | |
| 148 if (!set_thread_execution_state_failed_) { | |
| 149 set_thread_execution_state_failed_ = true; | |
| 150 LOG_GETLASTERROR(WARNING) | |
| 151 << "Failed to make system & display power assertion"; | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 // Make sure the GDI capture resources are up-to-date. | |
| 156 PrepareCaptureResources(); | |
| 157 | |
| 158 // Copy screen bits to the current buffer. | |
| 159 CaptureImage(); | |
| 160 | |
| 161 const webrtc::DesktopFrame* current_frame = queue_.current_frame(); | |
| 162 const webrtc::DesktopFrame* last_frame = queue_.previous_frame(); | |
| 163 if (last_frame) { | |
| 164 // Make sure the differencer is set up correctly for these previous and | |
| 165 // current screens. | |
| 166 if (!differ_.get() || | |
| 167 (differ_->width() != current_frame->size().width()) || | |
| 168 (differ_->height() != current_frame->size().height()) || | |
| 169 (differ_->bytes_per_row() != current_frame->stride())) { | |
| 170 differ_.reset(new Differ(current_frame->size().width(), | |
| 171 current_frame->size().height(), | |
| 172 webrtc::DesktopFrame::kBytesPerPixel, | |
| 173 current_frame->stride())); | |
| 174 } | |
| 175 | |
| 176 // Calculate difference between the two last captured frames. | |
| 177 webrtc::DesktopRegion region; | |
| 178 differ_->CalcDirtyRegion(last_frame->data(), current_frame->data(), | |
| 179 ®ion); | |
| 180 helper_.InvalidateRegion(region); | |
| 181 } else { | |
| 182 // No previous frame is available. Invalidate the whole screen. | |
| 183 helper_.InvalidateScreen(current_frame->size()); | |
| 184 } | |
| 185 | |
| 186 helper_.set_size_most_recent(current_frame->size()); | |
| 187 | |
| 188 // Emit the current frame. | |
| 189 webrtc::DesktopFrame* frame = queue_.current_frame()->Share(); | |
| 190 frame->set_dpi(webrtc::DesktopVector( | |
| 191 GetDeviceCaps(desktop_dc_, LOGPIXELSX), | |
| 192 GetDeviceCaps(desktop_dc_, LOGPIXELSY))); | |
| 193 frame->mutable_updated_region()->Clear(); | |
| 194 helper_.TakeInvalidRegion(frame->mutable_updated_region()); | |
| 195 frame->set_capture_time_ms( | |
| 196 (base::Time::Now() - capture_start_time).InMillisecondsRoundedUp()); | |
| 197 callback_->OnCaptureCompleted(frame); | |
| 198 | |
| 199 // Check for cursor shape update. | |
| 200 CaptureCursor(); | |
| 201 } | |
| 202 | |
| 203 void ScreenCapturerWin::SetMouseShapeObserver( | |
| 204 MouseShapeObserver* mouse_shape_observer) { | |
| 205 DCHECK(!mouse_shape_observer_); | |
| 206 DCHECK(mouse_shape_observer); | |
| 207 | |
| 208 mouse_shape_observer_ = mouse_shape_observer; | |
| 209 } | |
| 210 | |
| 211 void ScreenCapturerWin::Start(Callback* callback) { | |
| 212 DCHECK(!callback_); | |
| 213 DCHECK(callback); | |
| 214 | |
| 215 callback_ = callback; | |
| 216 | |
| 217 // Vote to disable Aero composited desktop effects while capturing. Windows | |
| 218 // will restore Aero automatically if the process exits. This has no effect | |
| 219 // under Windows 8 or higher. See crbug.com/124018. | |
| 220 if (composition_func_) | |
| 221 (*composition_func_)(DWM_EC_DISABLECOMPOSITION); | |
| 222 } | |
| 223 | |
| 224 void ScreenCapturerWin::PrepareCaptureResources() { | |
| 225 // Switch to the desktop receiving user input if different from the current | |
| 226 // one. | |
| 227 scoped_ptr<Desktop> input_desktop = Desktop::GetInputDesktop(); | |
| 228 if (input_desktop.get() != NULL && !desktop_.IsSame(*input_desktop)) { | |
| 229 // Release GDI resources otherwise SetThreadDesktop will fail. | |
| 230 if (desktop_dc_) { | |
| 231 ReleaseDC(NULL, desktop_dc_); | |
| 232 desktop_dc_ = NULL; | |
| 233 } | |
| 234 | |
| 235 if (memory_dc_) { | |
| 236 DeleteDC(memory_dc_); | |
| 237 memory_dc_ = NULL; | |
| 238 } | |
| 239 | |
| 240 // If SetThreadDesktop() fails, the thread is still assigned a desktop. | |
| 241 // So we can continue capture screen bits, just from the wrong desktop. | |
| 242 desktop_.SetThreadDesktop(input_desktop.Pass()); | |
| 243 | |
| 244 // Re-assert our vote to disable Aero. | |
| 245 // See crbug.com/124018 and crbug.com/129906. | |
| 246 if (composition_func_ != NULL) { | |
| 247 (*composition_func_)(DWM_EC_DISABLECOMPOSITION); | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 // If the display bounds have changed then recreate GDI resources. | |
| 252 // TODO(wez): Also check for pixel format changes. | |
| 253 webrtc::DesktopRect screen_rect(webrtc::DesktopRect::MakeXYWH( | |
| 254 GetSystemMetrics(SM_XVIRTUALSCREEN), | |
| 255 GetSystemMetrics(SM_YVIRTUALSCREEN), | |
| 256 GetSystemMetrics(SM_CXVIRTUALSCREEN), | |
| 257 GetSystemMetrics(SM_CYVIRTUALSCREEN))); | |
| 258 if (!screen_rect.equals(desktop_dc_rect_)) { | |
| 259 if (desktop_dc_) { | |
| 260 ReleaseDC(NULL, desktop_dc_); | |
| 261 desktop_dc_ = NULL; | |
| 262 } | |
| 263 if (memory_dc_) { | |
| 264 DeleteDC(memory_dc_); | |
| 265 memory_dc_ = NULL; | |
| 266 } | |
| 267 desktop_dc_rect_ = webrtc::DesktopRect(); | |
| 268 } | |
| 269 | |
| 270 if (desktop_dc_ == NULL) { | |
| 271 DCHECK(memory_dc_ == NULL); | |
| 272 | |
| 273 // Create GDI device contexts to capture from the desktop into memory. | |
| 274 desktop_dc_ = GetDC(NULL); | |
| 275 CHECK(desktop_dc_); | |
| 276 memory_dc_ = CreateCompatibleDC(desktop_dc_); | |
| 277 CHECK(memory_dc_); | |
| 278 desktop_dc_rect_ = screen_rect; | |
| 279 | |
| 280 // Make sure the frame buffers will be reallocated. | |
| 281 queue_.Reset(); | |
| 282 | |
| 283 helper_.ClearInvalidRegion(); | |
| 284 } | |
| 285 } | |
| 286 | |
| 287 void ScreenCapturerWin::CaptureImage() { | |
| 288 // If the current buffer is from an older generation then allocate a new one. | |
| 289 // Note that we can't reallocate other buffers at this point, since the caller | |
| 290 // may still be reading from them. | |
| 291 if (!queue_.current_frame()) { | |
| 292 DCHECK(desktop_dc_ != NULL); | |
| 293 DCHECK(memory_dc_ != NULL); | |
| 294 | |
| 295 webrtc::DesktopSize size = webrtc::DesktopSize( | |
| 296 desktop_dc_rect_.width(), desktop_dc_rect_.height()); | |
| 297 | |
| 298 size_t buffer_size = size.width() * size.height() * | |
| 299 webrtc::DesktopFrame::kBytesPerPixel; | |
| 300 webrtc::SharedMemory* shared_memory = | |
| 301 callback_->CreateSharedMemory(buffer_size); | |
| 302 scoped_ptr<webrtc::DesktopFrameWin> buffer( | |
| 303 webrtc::DesktopFrameWin::Create(size, shared_memory, desktop_dc_)); | |
| 304 queue_.ReplaceCurrentFrame(buffer.PassAs<webrtc::DesktopFrame>()); | |
| 305 } | |
| 306 | |
| 307 // Select the target bitmap into the memory dc and copy the rect from desktop | |
| 308 // to memory. | |
| 309 webrtc::DesktopFrameWin* current = static_cast<webrtc::DesktopFrameWin*>( | |
| 310 queue_.current_frame()->GetUnderlyingFrame()); | |
| 311 HGDIOBJ previous_object = SelectObject(memory_dc_, current->bitmap()); | |
| 312 if (previous_object != NULL) { | |
| 313 BitBlt(memory_dc_, | |
| 314 0, 0, desktop_dc_rect_.width(), desktop_dc_rect_.height(), | |
| 315 desktop_dc_, | |
| 316 desktop_dc_rect_.left(), desktop_dc_rect_.top(), | |
| 317 SRCCOPY | CAPTUREBLT); | |
| 318 | |
| 319 // Select back the previously selected object to that the device contect | |
| 320 // could be destroyed independently of the bitmap if needed. | |
| 321 SelectObject(memory_dc_, previous_object); | |
| 322 } | |
| 323 } | |
| 324 | |
| 325 void ScreenCapturerWin::AddCursorOutline(int width, | |
| 326 int height, | |
| 327 uint32* dst) { | |
| 328 for (int y = 0; y < height; y++) { | |
| 329 for (int x = 0; x < width; x++) { | |
| 330 // If this is a transparent pixel (bgr == 0 and alpha = 0), check the | |
| 331 // neighbor pixels to see if this should be changed to an outline pixel. | |
| 332 if (*dst == kPixelBgraTransparent) { | |
| 333 // Change to white pixel if any neighbors (top, bottom, left, right) | |
| 334 // are black. | |
| 335 if ((y > 0 && dst[-width] == kPixelBgraBlack) || | |
| 336 (y < height - 1 && dst[width] == kPixelBgraBlack) || | |
| 337 (x > 0 && dst[-1] == kPixelBgraBlack) || | |
| 338 (x < width - 1 && dst[1] == kPixelBgraBlack)) { | |
| 339 *dst = kPixelBgraWhite; | |
| 340 } | |
| 341 } | |
| 342 dst++; | |
| 343 } | |
| 344 } | |
| 345 } | |
| 346 | |
| 347 void ScreenCapturerWin::CaptureCursor() { | |
| 348 CURSORINFO cursor_info; | |
| 349 cursor_info.cbSize = sizeof(CURSORINFO); | |
| 350 if (!GetCursorInfo(&cursor_info)) { | |
| 351 VLOG(3) << "Unable to get cursor info. Error = " << GetLastError(); | |
| 352 return; | |
| 353 } | |
| 354 | |
| 355 // Note that this does not need to be freed. | |
| 356 HCURSOR hcursor = cursor_info.hCursor; | |
| 357 ICONINFO iinfo; | |
| 358 if (!GetIconInfo(hcursor, &iinfo)) { | |
| 359 VLOG(3) << "Unable to get cursor icon info. Error = " << GetLastError(); | |
| 360 return; | |
| 361 } | |
| 362 int hotspot_x = iinfo.xHotspot; | |
| 363 int hotspot_y = iinfo.yHotspot; | |
| 364 | |
| 365 // Get the cursor bitmap. | |
| 366 HBITMAP hbitmap; | |
| 367 BITMAP bitmap; | |
| 368 bool color_bitmap; | |
| 369 if (iinfo.hbmColor) { | |
| 370 // Color cursor bitmap. | |
| 371 color_bitmap = true; | |
| 372 hbitmap = reinterpret_cast<HBITMAP>( | |
| 373 CopyImage(iinfo.hbmColor, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION)); | |
| 374 if (!hbitmap) { | |
| 375 VLOG(3) << "Unable to copy color cursor image. Error = " | |
| 376 << GetLastError(); | |
| 377 return; | |
| 378 } | |
| 379 | |
| 380 // Free the color and mask bitmaps since we only need our copy. | |
| 381 DeleteObject(iinfo.hbmColor); | |
| 382 DeleteObject(iinfo.hbmMask); | |
| 383 } else { | |
| 384 // Black and white (xor) cursor. | |
| 385 color_bitmap = false; | |
| 386 hbitmap = iinfo.hbmMask; | |
| 387 } | |
| 388 | |
| 389 if (!GetObject(hbitmap, sizeof(BITMAP), &bitmap)) { | |
| 390 VLOG(3) << "Unable to get cursor bitmap. Error = " << GetLastError(); | |
| 391 DeleteObject(hbitmap); | |
| 392 return; | |
| 393 } | |
| 394 | |
| 395 int width = bitmap.bmWidth; | |
| 396 int height = bitmap.bmHeight; | |
| 397 // For non-color cursors, the mask contains both an AND and an XOR mask and | |
| 398 // the height includes both. Thus, the width is correct, but we need to | |
| 399 // divide by 2 to get the correct mask height. | |
| 400 if (!color_bitmap) { | |
| 401 height /= 2; | |
| 402 } | |
| 403 int data_size = height * width * webrtc::DesktopFrame::kBytesPerPixel; | |
| 404 | |
| 405 scoped_ptr<MouseCursorShape> cursor(new MouseCursorShape()); | |
| 406 cursor->data.resize(data_size); | |
| 407 uint8* cursor_dst_data = | |
| 408 reinterpret_cast<uint8*>(&*(cursor->data.begin())); | |
| 409 | |
| 410 // Copy/convert cursor bitmap into format needed by chromotocol. | |
| 411 int row_bytes = bitmap.bmWidthBytes; | |
| 412 if (color_bitmap) { | |
| 413 if (bitmap.bmPlanes != 1 || bitmap.bmBitsPixel != 32) { | |
| 414 VLOG(3) << "Unsupported color cursor format. Error = " << GetLastError(); | |
| 415 DeleteObject(hbitmap); | |
| 416 return; | |
| 417 } | |
| 418 | |
| 419 // Copy across colour cursor imagery. | |
| 420 // MouseCursorShape stores imagery top-down, and premultiplied | |
| 421 // by the alpha channel, whereas windows stores them bottom-up | |
| 422 // and not premultiplied. | |
| 423 uint8* cursor_src_data = reinterpret_cast<uint8*>(bitmap.bmBits); | |
| 424 uint8* src = cursor_src_data + ((height - 1) * row_bytes); | |
| 425 uint8* dst = cursor_dst_data; | |
| 426 for (int row = 0; row < height; ++row) { | |
| 427 for (int column = 0; column < width; ++column) { | |
| 428 dst[0] = AlphaMul(src[0], src[3]); | |
| 429 dst[1] = AlphaMul(src[1], src[3]); | |
| 430 dst[2] = AlphaMul(src[2], src[3]); | |
| 431 dst[3] = src[3]; | |
| 432 dst += webrtc::DesktopFrame::kBytesPerPixel; | |
| 433 src += webrtc::DesktopFrame::kBytesPerPixel; | |
| 434 } | |
| 435 src -= row_bytes + (width * webrtc::DesktopFrame::kBytesPerPixel); | |
| 436 } | |
| 437 } else { | |
| 438 if (bitmap.bmPlanes != 1 || bitmap.bmBitsPixel != 1) { | |
| 439 VLOG(3) << "Unsupported cursor mask format. Error = " << GetLastError(); | |
| 440 DeleteObject(hbitmap); | |
| 441 return; | |
| 442 } | |
| 443 | |
| 444 // x2 because there are 2 masks in the bitmap: AND and XOR. | |
| 445 int mask_bytes = height * row_bytes * 2; | |
| 446 scoped_ptr<uint8[]> mask(new uint8[mask_bytes]); | |
| 447 if (!GetBitmapBits(hbitmap, mask_bytes, mask.get())) { | |
| 448 VLOG(3) << "Unable to get cursor mask bits. Error = " << GetLastError(); | |
| 449 DeleteObject(hbitmap); | |
| 450 return; | |
| 451 } | |
| 452 uint8* and_mask = mask.get(); | |
| 453 uint8* xor_mask = mask.get() + height * row_bytes; | |
| 454 uint8* dst = cursor_dst_data; | |
| 455 bool add_outline = false; | |
| 456 for (int y = 0; y < height; y++) { | |
| 457 for (int x = 0; x < width; x++) { | |
| 458 int byte = y * row_bytes + x / 8; | |
| 459 int bit = 7 - x % 8; | |
| 460 int and_bit = and_mask[byte] & (1 << bit); | |
| 461 int xor_bit = xor_mask[byte] & (1 << bit); | |
| 462 | |
| 463 // The two cursor masks combine as follows: | |
| 464 // AND XOR Windows Result Our result RGB Alpha | |
| 465 // 0 0 Black Black 00 ff | |
| 466 // 0 1 White White ff ff | |
| 467 // 1 0 Screen Transparent 00 00 | |
| 468 // 1 1 Reverse-screen Black 00 ff | |
| 469 // Since we don't support XOR cursors, we replace the "Reverse Screen" | |
| 470 // with black. In this case, we also add an outline around the cursor | |
| 471 // so that it is visible against a dark background. | |
| 472 int rgb = (!and_bit && xor_bit) ? 0xff : 0x00; | |
| 473 int alpha = (and_bit && !xor_bit) ? 0x00 : 0xff; | |
| 474 *dst++ = rgb; | |
| 475 *dst++ = rgb; | |
| 476 *dst++ = rgb; | |
| 477 *dst++ = alpha; | |
| 478 if (and_bit && xor_bit) { | |
| 479 add_outline = true; | |
| 480 } | |
| 481 } | |
| 482 } | |
| 483 if (add_outline) { | |
| 484 AddCursorOutline(width, height, | |
| 485 reinterpret_cast<uint32*>(cursor_dst_data)); | |
| 486 } | |
| 487 } | |
| 488 | |
| 489 DeleteObject(hbitmap); | |
| 490 | |
| 491 cursor->size.set(width, height); | |
| 492 cursor->hotspot.set(hotspot_x, hotspot_y); | |
| 493 | |
| 494 // Compare the current cursor with the last one we sent to the client. If | |
| 495 // they're the same, then don't bother sending the cursor again. | |
| 496 if (last_cursor_.size.equals(cursor->size) && | |
| 497 last_cursor_.hotspot.equals(cursor->hotspot) && | |
| 498 last_cursor_.data == cursor->data) { | |
| 499 return; | |
| 500 } | |
| 501 | |
| 502 VLOG(3) << "Sending updated cursor: " << width << "x" << height; | |
| 503 | |
| 504 // Record the last cursor image that we sent to the client. | |
| 505 last_cursor_ = *cursor; | |
| 506 | |
| 507 if (mouse_shape_observer_) | |
| 508 mouse_shape_observer_->OnCursorShapeChanged(cursor.Pass()); | |
| 509 } | |
| 510 | |
| 511 } // namespace | |
| 512 | |
| 513 // static | |
| 514 scoped_ptr<ScreenCapturer> ScreenCapturer::Create() { | |
| 515 return CreateWithDisableAero(true); | |
| 516 } | |
| 517 | |
| 518 // static | |
| 519 scoped_ptr<ScreenCapturer> ScreenCapturer::CreateWithDisableAero( | |
| 520 bool disable_aero) { | |
| 521 return scoped_ptr<ScreenCapturer>(new ScreenCapturerWin(disable_aero)); | |
| 522 } | |
| 523 | |
| 524 } // namespace media | |
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Chromium Code Reviews
Issue 15692018:
Remove screen capturers from media/video/capture/screen. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src