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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/host/capturer.h" | |
| 6 | |
| 7 #include <windows.h> | |
| 8 | |
| 9 #include "base/file_path.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/memory/scoped_ptr.h" | |
| 12 #include "base/scoped_native_library.h" | |
| 13 #include "base/utf_string_conversions.h" | |
| 14 #include "base/win/scoped_gdi_object.h" | |
| 15 #include "base/win/scoped_hdc.h" | |
| 16 #include "remoting/base/capture_data.h" | |
| 17 #include "remoting/host/capturer_helper.h" | |
| 18 #include "remoting/host/desktop_win.h" | |
| 19 #include "remoting/host/differ.h" | |
| 20 #include "remoting/host/scoped_thread_desktop_win.h" | |
| 21 #include "remoting/proto/control.pb.h" | |
| 22 | |
| 23 namespace remoting { | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 // Constants from dwmapi.h. | |
| 28 const UINT DWM_EC_DISABLECOMPOSITION = 0; | |
| 29 const UINT DWM_EC_ENABLECOMPOSITION = 1; | |
| 30 | |
| 31 typedef HRESULT (WINAPI * DwmEnableCompositionFunc)(UINT); | |
| 32 | |
| 33 const char kDwmapiLibraryName[] = "dwmapi"; | |
| 34 | |
| 35 // Pixel colors used when generating cursor outlines. | |
| 36 const uint32 kPixelBgraBlack = 0xff000000; | |
| 37 const uint32 kPixelBgraWhite = 0xffffffff; | |
| 38 const uint32 kPixelBgraTransparent = 0x00000000; | |
| 39 | |
| 40 // CapturerGdi captures 32bit RGB using GDI. | |
| 41 // | |
| 42 // CapturerGdi is double-buffered as required by Capturer. See | |
| 43 // remoting/host/capturer.h. | |
| 44 class CapturerGdi : public Capturer { | |
| 45 public: | |
| 46 CapturerGdi(); | |
| 47 virtual ~CapturerGdi(); | |
| 48 | |
| 49 // Capturer interface. | |
| 50 virtual void Start(const CursorShapeChangedCallback& callback) OVERRIDE; | |
| 51 virtual void Stop() OVERRIDE; | |
| 52 virtual void ScreenConfigurationChanged() OVERRIDE; | |
| 53 virtual media::VideoFrame::Format pixel_format() const OVERRIDE; | |
| 54 virtual void ClearInvalidRegion() OVERRIDE; | |
| 55 virtual void InvalidateRegion(const SkRegion& invalid_region) OVERRIDE; | |
| 56 virtual void InvalidateScreen(const SkISize& size) OVERRIDE; | |
| 57 virtual void InvalidateFullScreen() OVERRIDE; | |
| 58 virtual void CaptureInvalidRegion( | |
| 59 const CaptureCompletedCallback& callback) OVERRIDE; | |
| 60 virtual const SkISize& size_most_recent() const OVERRIDE; | |
| 61 | |
| 62 private: | |
| 63 struct VideoFrameBuffer { | |
| 64 VideoFrameBuffer(void* data, const SkISize& size, int bytes_per_pixel, | |
| 65 int bytes_per_row) | |
| 66 : data(data), size(size), bytes_per_pixel(bytes_per_pixel), | |
| 67 bytes_per_row(bytes_per_row) { | |
| 68 } | |
| 69 VideoFrameBuffer() { | |
| 70 data = 0; | |
| 71 size = SkISize::Make(0, 0); | |
| 72 bytes_per_pixel = 0; | |
| 73 bytes_per_row = 0; | |
| 74 } | |
| 75 void* data; | |
| 76 SkISize size; | |
| 77 int bytes_per_pixel; | |
| 78 int bytes_per_row; | |
| 79 int resource_generation; | |
| 80 }; | |
| 81 | |
| 82 // Make sure that the device contexts and the current bufffer match the screen | |
| 83 // configuration. | |
| 84 void PrepareCaptureResources(); | |
| 85 | |
| 86 // Allocates the specified capture buffer using the current device contexts | |
| 87 // and desktop dimensions, releasing any pre-existing buffer. | |
| 88 void AllocateBuffer(int buffer_index); | |
| 89 | |
| 90 void CalculateInvalidRegion(); | |
| 91 void CaptureRegion(const SkRegion& region, | |
| 92 const CaptureCompletedCallback& callback); | |
| 93 | |
| 94 // Generates an image in the current buffer. | |
| 95 void CaptureImage(); | |
| 96 | |
| 97 // Expand the cursor shape to add a white outline for visibility against | |
| 98 // dark backgrounds. | |
| 99 void AddCursorOutline(int width, int height, uint32* dst); | |
| 100 | |
| 101 // Capture the current cursor shape. | |
| 102 void CaptureCursor(); | |
| 103 | |
| 104 // A thread-safe list of invalid rectangles, and the size of the most | |
| 105 // recently captured screen. | |
| 106 CapturerHelper helper_; | |
| 107 | |
| 108 // Callback notified whenever the cursor shape is changed. | |
| 109 CursorShapeChangedCallback cursor_shape_changed_callback_; | |
| 110 | |
| 111 // Snapshot of the last cursor bitmap we sent to the client. This is used | |
| 112 // to diff against the current cursor so we only send a cursor-change | |
| 113 // message when the shape has changed. | |
| 114 scoped_array<uint8> last_cursor_; | |
| 115 SkISize last_cursor_size_; | |
| 116 | |
| 117 // There are two buffers for the screen images, as required by Capturer. | |
| 118 static const int kNumBuffers = 2; | |
| 119 VideoFrameBuffer buffers_[kNumBuffers]; | |
| 120 | |
| 121 ScopedThreadDesktopWin desktop_; | |
| 122 | |
| 123 // GDI resources used for screen capture. | |
| 124 scoped_ptr<base::win::ScopedGetDC> desktop_dc_; | |
| 125 base::win::ScopedCreateDC memory_dc_; | |
| 126 base::win::ScopedBitmap target_bitmap_[kNumBuffers]; | |
| 127 int resource_generation_; | |
| 128 | |
| 129 // Rectangle describing the bounds of the desktop device context. | |
| 130 SkIRect desktop_dc_rect_; | |
| 131 | |
| 132 // The current buffer with valid data for reading. | |
| 133 int current_buffer_; | |
| 134 | |
| 135 // Format of pixels returned in buffer. | |
| 136 media::VideoFrame::Format pixel_format_; | |
| 137 | |
| 138 // Class to calculate the difference between two screen bitmaps. | |
| 139 scoped_ptr<Differ> differ_; | |
| 140 | |
| 141 base::ScopedNativeLibrary dwmapi_library_; | |
| 142 DwmEnableCompositionFunc composition_func_; | |
| 143 | |
| 144 DISALLOW_COPY_AND_ASSIGN(CapturerGdi); | |
| 145 }; | |
| 146 | |
| 147 // 3780 pixels per meter is equivalent to 96 DPI, typical on desktop monitors. | |
| 148 static const int kPixelsPerMeter = 3780; | |
| 149 // 32 bit RGBA is 4 bytes per pixel. | |
| 150 static const int kBytesPerPixel = 4; | |
| 151 | |
| 152 CapturerGdi::CapturerGdi() | |
| 153 : last_cursor_size_(SkISize::Make(0, 0)), | |
| 154 desktop_dc_rect_(SkIRect::MakeEmpty()), | |
| 155 resource_generation_(0), | |
| 156 current_buffer_(0), | |
| 157 pixel_format_(media::VideoFrame::RGB32), | |
| 158 composition_func_(NULL) { | |
| 159 ScreenConfigurationChanged(); | |
| 160 } | |
| 161 | |
| 162 CapturerGdi::~CapturerGdi() { | |
| 163 } | |
| 164 | |
| 165 media::VideoFrame::Format CapturerGdi::pixel_format() const { | |
| 166 return pixel_format_; | |
| 167 } | |
| 168 | |
| 169 void CapturerGdi::ClearInvalidRegion() { | |
| 170 helper_.ClearInvalidRegion(); | |
| 171 } | |
| 172 | |
| 173 void CapturerGdi::InvalidateRegion(const SkRegion& invalid_region) { | |
| 174 helper_.InvalidateRegion(invalid_region); | |
| 175 } | |
| 176 | |
| 177 void CapturerGdi::InvalidateScreen(const SkISize& size) { | |
| 178 helper_.InvalidateScreen(size); | |
| 179 } | |
| 180 | |
| 181 void CapturerGdi::InvalidateFullScreen() { | |
| 182 helper_.InvalidateFullScreen(); | |
| 183 } | |
| 184 | |
| 185 void CapturerGdi::CaptureInvalidRegion( | |
| 186 const CaptureCompletedCallback& callback) { | |
| 187 // Force the system to power-up display hardware, if it has been suspended. | |
| 188 SetThreadExecutionState(ES_DISPLAY_REQUIRED); | |
| 189 | |
| 190 // Perform the capture. | |
| 191 CalculateInvalidRegion(); | |
| 192 SkRegion invalid_region; | |
| 193 helper_.SwapInvalidRegion(&invalid_region); | |
| 194 CaptureRegion(invalid_region, callback); | |
| 195 | |
| 196 // Check for cursor shape update. | |
| 197 CaptureCursor(); | |
| 198 } | |
| 199 | |
| 200 const SkISize& CapturerGdi::size_most_recent() const { | |
| 201 return helper_.size_most_recent(); | |
| 202 } | |
| 203 | |
| 204 void CapturerGdi::Start( | |
| 205 const CursorShapeChangedCallback& callback) { | |
| 206 cursor_shape_changed_callback_ = callback; | |
| 207 | |
| 208 // Load dwmapi.dll dynamically since it is not available on XP. | |
| 209 if (!dwmapi_library_.is_valid()) { | |
| 210 FilePath path(base::GetNativeLibraryName(UTF8ToUTF16(kDwmapiLibraryName))); | |
| 211 dwmapi_library_.Reset(base::LoadNativeLibrary(path, NULL)); | |
| 212 } | |
| 213 | |
| 214 if (dwmapi_library_.is_valid() && composition_func_ == NULL) { | |
| 215 composition_func_ = static_cast<DwmEnableCompositionFunc>( | |
| 216 dwmapi_library_.GetFunctionPointer("DwmEnableComposition")); | |
| 217 } | |
| 218 | |
| 219 // Vote to disable Aero composited desktop effects while capturing. Windows | |
| 220 // will restore Aero automatically if the process exits. This has no effect | |
| 221 // under Windows 8 or higher. See crbug.com/124018. | |
| 222 if (composition_func_ != NULL) { | |
| 223 (*composition_func_)(DWM_EC_DISABLECOMPOSITION); | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 void CapturerGdi::Stop() { | |
| 228 // Restore Aero. | |
| 229 if (composition_func_ != NULL) { | |
| 230 (*composition_func_)(DWM_EC_ENABLECOMPOSITION); | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 void CapturerGdi::ScreenConfigurationChanged() { | |
| 235 // We poll for screen configuration changes, so ignore notifications. | |
| 236 } | |
| 237 | |
| 238 void CapturerGdi::PrepareCaptureResources() { | |
| 239 // Switch to the desktop receiving user input if different from the current | |
| 240 // one. | |
| 241 scoped_ptr<DesktopWin> input_desktop = DesktopWin::GetInputDesktop(); | |
| 242 if (input_desktop.get() != NULL && !desktop_.IsSame(*input_desktop)) { | |
| 243 // Release GDI resources otherwise SetThreadDesktop will fail. | |
| 244 desktop_dc_.reset(); | |
| 245 memory_dc_.Set(NULL); | |
| 246 | |
| 247 // If SetThreadDesktop() fails, the thread is still assigned a desktop. | |
| 248 // So we can continue capture screen bits, just from the wrong desktop. | |
| 249 desktop_.SetThreadDesktop(input_desktop.Pass()); | |
| 250 } | |
| 251 | |
| 252 // If the display bounds have changed then recreate GDI resources. | |
| 253 // TODO(wez): Also check for pixel format changes. | |
| 254 SkIRect screen_rect(SkIRect::MakeXYWH( | |
| 255 GetSystemMetrics(SM_XVIRTUALSCREEN), | |
| 256 GetSystemMetrics(SM_YVIRTUALSCREEN), | |
| 257 GetSystemMetrics(SM_CXVIRTUALSCREEN), | |
| 258 GetSystemMetrics(SM_CYVIRTUALSCREEN))); | |
| 259 if (screen_rect != desktop_dc_rect_) { | |
| 260 desktop_dc_.reset(); | |
| 261 memory_dc_.Set(NULL); | |
| 262 desktop_dc_rect_.setEmpty(); | |
| 263 } | |
| 264 | |
| 265 // Create GDI device contexts to capture from the desktop into memory, and | |
| 266 // allocate buffers to capture into. | |
| 267 if (desktop_dc_.get() == NULL) { | |
| 268 DCHECK(memory_dc_.Get() == NULL); | |
| 269 | |
| 270 desktop_dc_.reset(new base::win::ScopedGetDC(NULL)); | |
| 271 memory_dc_.Set(CreateCompatibleDC(*desktop_dc_)); | |
| 272 desktop_dc_rect_ = screen_rect; | |
| 273 | |
| 274 ++resource_generation_; | |
| 275 } | |
| 276 | |
| 277 // If the current buffer is from an older generation then allocate a new one. | |
| 278 // Note that we can't reallocate other buffers at this point, since the caller | |
| 279 // may still be reading from them. | |
| 280 if (resource_generation_ != buffers_[current_buffer_].resource_generation) { | |
| 281 AllocateBuffer(current_buffer_); | |
| 282 InvalidateFullScreen(); | |
| 283 } | |
| 284 } | |
| 285 | |
| 286 void CapturerGdi::AllocateBuffer(int buffer_index) { | |
| 287 DCHECK(desktop_dc_.get() != NULL); | |
| 288 DCHECK(memory_dc_.Get() != NULL); | |
| 289 | |
| 290 // Windows requires DIB sections' rows to start DWORD-aligned, which is | |
| 291 // implicit when working with RGB32 pixels. | |
| 292 DCHECK_EQ(pixel_format_, media::VideoFrame::RGB32); | |
| 293 | |
| 294 // Describe a device independent bitmap (DIB) that is the size of the desktop. | |
| 295 BITMAPINFO bmi; | |
| 296 memset(&bmi, 0, sizeof(bmi)); | |
| 297 bmi.bmiHeader.biHeight = -desktop_dc_rect_.height(); | |
| 298 bmi.bmiHeader.biWidth = desktop_dc_rect_.width(); | |
| 299 bmi.bmiHeader.biPlanes = 1; | |
| 300 bmi.bmiHeader.biBitCount = kBytesPerPixel * 8; | |
| 301 bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader); | |
| 302 int bytes_per_row = desktop_dc_rect_.width() * kBytesPerPixel; | |
| 303 bmi.bmiHeader.biSizeImage = bytes_per_row * desktop_dc_rect_.height(); | |
| 304 bmi.bmiHeader.biXPelsPerMeter = kPixelsPerMeter; | |
| 305 bmi.bmiHeader.biYPelsPerMeter = kPixelsPerMeter; | |
| 306 | |
| 307 // Create the DIB, and store a pointer to its pixel buffer. | |
| 308 target_bitmap_[buffer_index] = | |
| 309 CreateDIBSection(*desktop_dc_, &bmi, DIB_RGB_COLORS, | |
| 310 static_cast<void**>(&buffers_[buffer_index].data), | |
| 311 NULL, 0); | |
| 312 buffers_[buffer_index].size = SkISize::Make(bmi.bmiHeader.biWidth, | |
| 313 std::abs(bmi.bmiHeader.biHeight)); | |
| 314 buffers_[buffer_index].bytes_per_pixel = bmi.bmiHeader.biBitCount / 8; | |
| 315 buffers_[buffer_index].bytes_per_row = | |
| 316 bmi.bmiHeader.biSizeImage / std::abs(bmi.bmiHeader.biHeight); | |
| 317 } | |
| 318 | |
| 319 void CapturerGdi::CalculateInvalidRegion() { | |
| 320 CaptureImage(); | |
| 321 | |
| 322 const VideoFrameBuffer& current = buffers_[current_buffer_]; | |
| 323 | |
| 324 // Find the previous and current screens. | |
| 325 int prev_buffer_id = current_buffer_ - 1; | |
| 326 if (prev_buffer_id < 0) { | |
| 327 prev_buffer_id = kNumBuffers - 1; | |
| 328 } | |
| 329 const VideoFrameBuffer& prev = buffers_[prev_buffer_id]; | |
| 330 | |
| 331 // Maybe the previous and current screens can't be differenced. | |
| 332 if ((current.size != prev.size) || | |
| 333 (current.bytes_per_pixel != prev.bytes_per_pixel) || | |
| 334 (current.bytes_per_row != prev.bytes_per_row)) { | |
| 335 InvalidateScreen(current.size); | |
| 336 return; | |
| 337 } | |
| 338 | |
| 339 // Make sure the differencer is set up correctly for these previous and | |
| 340 // current screens. | |
| 341 if (!differ_.get() || | |
| 342 (differ_->width() != current.size.width()) || | |
| 343 (differ_->height() != current.size.height()) || | |
| 344 (differ_->bytes_per_pixel() != current.bytes_per_pixel) || | |
| 345 (differ_->bytes_per_row() != current.bytes_per_row)) { | |
| 346 differ_.reset(new Differ(current.size.width(), current.size.height(), | |
| 347 current.bytes_per_pixel, current.bytes_per_row)); | |
| 348 } | |
| 349 | |
| 350 SkRegion region; | |
| 351 differ_->CalcDirtyRegion(prev.data, current.data, ®ion); | |
| 352 | |
| 353 InvalidateRegion(region); | |
| 354 } | |
| 355 | |
| 356 void CapturerGdi::CaptureRegion(const SkRegion& region, | |
| 357 const CaptureCompletedCallback& callback) { | |
| 358 const VideoFrameBuffer& buffer = buffers_[current_buffer_]; | |
| 359 current_buffer_ = (current_buffer_ + 1) % kNumBuffers; | |
| 360 | |
| 361 DataPlanes planes; | |
| 362 planes.data[0] = static_cast<uint8*>(buffer.data); | |
| 363 planes.strides[0] = buffer.bytes_per_row; | |
| 364 | |
| 365 scoped_refptr<CaptureData> data(new CaptureData(planes, | |
| 366 buffer.size, | |
| 367 pixel_format_)); | |
| 368 data->mutable_dirty_region() = region; | |
| 369 | |
| 370 helper_.set_size_most_recent(data->size()); | |
| 371 | |
| 372 callback.Run(data); | |
| 373 } | |
| 374 | |
| 375 void CapturerGdi::CaptureImage() { | |
| 376 // Make sure the GDI capture resources are up-to-date. | |
| 377 PrepareCaptureResources(); | |
| 378 | |
| 379 // Select the target bitmap into the memory dc. | |
| 380 SelectObject(memory_dc_, target_bitmap_[current_buffer_]); | |
| 381 | |
| 382 // And then copy the rect from desktop to memory. | |
| 383 BitBlt(memory_dc_, 0, 0, buffers_[current_buffer_].size.width(), | |
| 384 buffers_[current_buffer_].size.height(), *desktop_dc_, | |
| 385 desktop_dc_rect_.x(), desktop_dc_rect_.y(), | |
| 386 SRCCOPY | CAPTUREBLT); | |
| 387 } | |
| 388 | |
| 389 void CapturerGdi::AddCursorOutline(int width, int height, uint32* dst) { | |
| 390 for (int y = 0; y < height; y++) { | |
| 391 for (int x = 0; x < width; x++) { | |
| 392 // If this is a transparent pixel (bgr == 0 and alpha = 0), check the | |
| 393 // neighbor pixels to see if this should be changed to an outline pixel. | |
| 394 if (*dst == kPixelBgraTransparent) { | |
| 395 // Change to white pixel if any neighbors (top, bottom, left, right) | |
| 396 // are black. | |
| 397 if ((y > 0 && dst[-width] == kPixelBgraBlack) || | |
| 398 (y < height - 1 && dst[width] == kPixelBgraBlack) || | |
| 399 (x > 0 && dst[-1] == kPixelBgraBlack) || | |
| 400 (x < width - 1 && dst[1] == kPixelBgraBlack)) { | |
| 401 *dst = kPixelBgraWhite; | |
| 402 } | |
| 403 } | |
| 404 dst++; | |
| 405 } | |
| 406 } | |
| 407 } | |
| 408 | |
| 409 void CapturerGdi::CaptureCursor() { | |
| 410 CURSORINFO cursor_info; | |
| 411 cursor_info.cbSize = sizeof(CURSORINFO); | |
| 412 if (!GetCursorInfo(&cursor_info)) { | |
| 413 VLOG(3) << "Unable to get cursor info. Error = " << GetLastError(); | |
| 414 return; | |
| 415 } | |
| 416 | |
| 417 // Note that this does not need to be freed. | |
| 418 HCURSOR hcursor = cursor_info.hCursor; | |
| 419 ICONINFO iinfo; | |
| 420 if (!GetIconInfo(hcursor, &iinfo)) { | |
| 421 VLOG(3) << "Unable to get cursor icon info. Error = " << GetLastError(); | |
| 422 return; | |
| 423 } | |
| 424 int hotspot_x = iinfo.xHotspot; | |
| 425 int hotspot_y = iinfo.yHotspot; | |
| 426 | |
| 427 // Get the cursor bitmap. | |
| 428 base::win::ScopedBitmap hbitmap; | |
| 429 BITMAP bitmap; | |
| 430 bool color_bitmap; | |
| 431 if (iinfo.hbmColor) { | |
| 432 // Color cursor bitmap. | |
| 433 color_bitmap = true; | |
| 434 hbitmap.Set((HBITMAP)CopyImage(iinfo.hbmColor, IMAGE_BITMAP, 0, 0, | |
| 435 LR_CREATEDIBSECTION)); | |
| 436 if (!hbitmap.Get()) { | |
| 437 VLOG(3) << "Unable to copy color cursor image. Error = " | |
| 438 << GetLastError(); | |
| 439 return; | |
| 440 } | |
| 441 | |
| 442 // Free the color and mask bitmaps since we only need our copy. | |
| 443 DeleteObject(iinfo.hbmColor); | |
| 444 DeleteObject(iinfo.hbmMask); | |
| 445 } else { | |
| 446 // Black and white (xor) cursor. | |
| 447 color_bitmap = false; | |
| 448 hbitmap.Set(iinfo.hbmMask); | |
| 449 } | |
| 450 | |
| 451 if (!GetObject(hbitmap.Get(), sizeof(BITMAP), &bitmap)) { | |
| 452 VLOG(3) << "Unable to get cursor bitmap. Error = " << GetLastError(); | |
| 453 return; | |
| 454 } | |
| 455 | |
| 456 int width = bitmap.bmWidth; | |
| 457 int height = bitmap.bmHeight; | |
| 458 // For non-color cursors, the mask contains both an AND and an XOR mask and | |
| 459 // the height includes both. Thus, the width is correct, but we need to | |
| 460 // divide by 2 to get the correct mask height. | |
| 461 if (!color_bitmap) { | |
| 462 height /= 2; | |
| 463 } | |
| 464 int data_size = height * width * kBytesPerPixel; | |
| 465 | |
| 466 scoped_ptr<protocol::CursorShapeInfo> cursor_proto( | |
| 467 new protocol::CursorShapeInfo()); | |
| 468 cursor_proto->mutable_data()->resize(data_size); | |
| 469 uint8* cursor_dst_data = const_cast<uint8*>(reinterpret_cast<const uint8*>( | |
| 470 cursor_proto->mutable_data()->data())); | |
| 471 | |
| 472 // Copy/convert cursor bitmap into format needed by chromotocol. | |
| 473 int row_bytes = bitmap.bmWidthBytes; | |
| 474 if (color_bitmap) { | |
| 475 if (bitmap.bmPlanes != 1 || bitmap.bmBitsPixel != 32) { | |
| 476 VLOG(3) << "Unsupported color cursor format. Error = " << GetLastError(); | |
| 477 return; | |
| 478 } | |
| 479 | |
| 480 // Cursor bitmap is stored upside-down on Windows. Flip the rows and store | |
| 481 // it in the proto. | |
| 482 uint8* cursor_src_data = reinterpret_cast<uint8*>(bitmap.bmBits); | |
| 483 uint8* src = cursor_src_data + ((height - 1) * row_bytes); | |
| 484 uint8* dst = cursor_dst_data; | |
| 485 for (int row = 0; row < height; row++) { | |
| 486 memcpy(dst, src, row_bytes); | |
| 487 dst += width * kBytesPerPixel; | |
| 488 src -= row_bytes; | |
| 489 } | |
| 490 } else { | |
| 491 if (bitmap.bmPlanes != 1 || bitmap.bmBitsPixel != 1) { | |
| 492 VLOG(3) << "Unsupported cursor mask format. Error = " << GetLastError(); | |
| 493 return; | |
| 494 } | |
| 495 | |
| 496 // x2 because there are 2 masks in the bitmap: AND and XOR. | |
| 497 int mask_bytes = height * row_bytes * 2; | |
| 498 scoped_array<uint8> mask(new uint8[mask_bytes]); | |
| 499 if (!GetBitmapBits(hbitmap.Get(), mask_bytes, mask.get())) { | |
| 500 VLOG(3) << "Unable to get cursor mask bits. Error = " << GetLastError(); | |
| 501 return; | |
| 502 } | |
| 503 uint8* and_mask = mask.get(); | |
| 504 uint8* xor_mask = mask.get() + height * row_bytes; | |
| 505 uint8* dst = cursor_dst_data; | |
| 506 bool add_outline = false; | |
| 507 for (int y = 0; y < height; y++) { | |
| 508 for (int x = 0; x < width; x++) { | |
| 509 int byte = y * row_bytes + x / 8; | |
| 510 int bit = 7 - x % 8; | |
| 511 int and = and_mask[byte] & (1 << bit); | |
| 512 int xor = xor_mask[byte] & (1 << bit); | |
| 513 | |
| 514 // The two cursor masks combine as follows: | |
| 515 // AND XOR Windows Result Our result RGB Alpha | |
| 516 // 0 0 Black Black 00 ff | |
| 517 // 0 1 White White ff ff | |
| 518 // 1 0 Screen Transparent 00 00 | |
| 519 // 1 1 Reverse-screen Black 00 ff | |
| 520 // Since we don't support XOR cursors, we replace the "Reverse Screen" | |
| 521 // with black. In this case, we also add an outline around the cursor | |
| 522 // so that it is visible against a dark background. | |
| 523 int rgb = (!and && xor) ? 0xff : 0x00; | |
| 524 int alpha = (and && !xor) ? 0x00 : 0xff; | |
| 525 *dst++ = rgb; | |
| 526 *dst++ = rgb; | |
| 527 *dst++ = rgb; | |
| 528 *dst++ = alpha; | |
| 529 if (and && xor) { | |
| 530 add_outline = true; | |
| 531 } | |
| 532 } | |
| 533 } | |
| 534 if (add_outline) { | |
| 535 AddCursorOutline(width, height, | |
| 536 reinterpret_cast<uint32*>(cursor_dst_data)); | |
| 537 } | |
| 538 } | |
| 539 | |
| 540 // Compare the current cursor with the last one we sent to the client. If | |
| 541 // they're the same, then don't bother sending the cursor again. | |
| 542 if (last_cursor_size_.equals(width, height) && | |
| 543 memcmp(last_cursor_.get(), cursor_dst_data, data_size) == 0) { | |
| 544 return; | |
| 545 } | |
| 546 | |
| 547 VLOG(3) << "Sending updated cursor: " << width << "x" << height; | |
| 548 | |
| 549 cursor_proto->set_width(width); | |
| 550 cursor_proto->set_height(height); | |
| 551 cursor_proto->set_hotspot_x(hotspot_x); | |
| 552 cursor_proto->set_hotspot_y(hotspot_y); | |
| 553 | |
| 554 // Record the last cursor image that we sent to the client. | |
| 555 last_cursor_.reset(new uint8[data_size]); | |
| 556 memcpy(last_cursor_.get(), cursor_dst_data, data_size); | |
| 557 last_cursor_size_ = SkISize::Make(width, height); | |
| 558 | |
| 559 cursor_shape_changed_callback_.Run(cursor_proto.Pass()); | |
| 560 } | |
| 561 | |
| 562 } // namespace | |
| 563 | |
| 564 // static | |
| 565 Capturer* Capturer::Create() { | |
| 566 return new CapturerGdi(); | |
| 567 } | |
| 568 | |
| 569 } // namespace remoting | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 10790075:
Rename Capturer to VideoFrameCapturer. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src