Remove screen capturers from media/video/capture/screen.

media/video/capture/screen/screen_capturer_x11.cc

Index: media/video/capture/screen/screen_capturer_x11.cc
diff --git a/media/video/capture/screen/screen_capturer_x11.cc b/media/video/capture/screen/screen_capturer_x11.cc
deleted file mode 100644
index 775151c0236eb1bce6dd1f21ac4d333a5befdeea..0000000000000000000000000000000000000000
--- a/media/video/capture/screen/screen_capturer_x11.cc
+++ /dev/null
@@ -1,613 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "media/video/capture/screen/screen_capturer.h"
-
-#include <X11/extensions/Xdamage.h>
-#include <X11/extensions/Xfixes.h>
-#include <X11/Xlib.h>
-#include <X11/Xutil.h>
-
-#include <set>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "media/video/capture/screen/differ.h"
-#include "media/video/capture/screen/mouse_cursor_shape.h"
-#include "media/video/capture/screen/screen_capture_frame_queue.h"
-#include "media/video/capture/screen/screen_capturer_helper.h"
-#include "media/video/capture/screen/x11/x_server_pixel_buffer.h"
-#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
-
-namespace media {
-
-namespace {
-
-// A class to perform video frame capturing for Linux.
-class ScreenCapturerLinux : public ScreenCapturer {
- public:
-  ScreenCapturerLinux();
-  virtual ~ScreenCapturerLinux();
-
-  // TODO(ajwong): Do we really want this to be synchronous?
-  bool Init(bool use_x_damage);
-
-  // DesktopCapturer interface.
-  virtual void Start(Callback* delegate) OVERRIDE;
-  virtual void Capture(const webrtc::DesktopRegion& region) OVERRIDE;
-
-  // ScreenCapturer interface.
-  virtual void SetMouseShapeObserver(
-      MouseShapeObserver* mouse_shape_observer) OVERRIDE;
-
- private:
-  void InitXDamage();
-
-  // Read and handle all currently-pending XEvents.
-  // In the DAMAGE case, process the XDamage events and store the resulting
-  // damage rectangles in the ScreenCapturerHelper.
-  // In all cases, call ScreenConfigurationChanged() in response to any
-  // ConfigNotify events.
-  void ProcessPendingXEvents();
-
-  // Capture the cursor image and notify the delegate if it was captured.
-  void CaptureCursor();
-
-  // Capture screen pixels to the current buffer in the queue. In the DAMAGE
-  // case, the ScreenCapturerHelper already holds the list of invalid rectangles
-  // from ProcessPendingXEvents(). In the non-DAMAGE case, this captures the
-  // whole screen, then calculates some invalid rectangles that include any
-  // differences between this and the previous capture.
-  webrtc::DesktopFrame* CaptureScreen();
-
-  // Called when the screen configuration is changed. |root_window_size|
-  // specifies the most recent size of the root window.
-  void ScreenConfigurationChanged(const webrtc::DesktopSize& root_window_size);
-
-  // Synchronize the current buffer with |last_buffer_|, by copying pixels from
-  // the area of |last_invalid_rects|.
-  // Note this only works on the assumption that kNumBuffers == 2, as
-  // |last_invalid_rects| holds the differences from the previous buffer and
-  // the one prior to that (which will then be the current buffer).
-  void SynchronizeFrame();
-
-  void DeinitXlib();
-
-  // Capture a rectangle from |x_server_pixel_buffer_|, and copy the data into
-  // |frame|.
-  void CaptureRect(const webrtc::DesktopRect& rect,
-                   webrtc::DesktopFrame* frame);
-
-  // We expose two forms of blitting to handle variations in the pixel format.
-  // In FastBlit, the operation is effectively a memcpy.
-  void FastBlit(uint8* image,
-                const webrtc::DesktopRect& rect,
-                webrtc::DesktopFrame* frame);
-  void SlowBlit(uint8* image,
-                const webrtc::DesktopRect& rect,
-                webrtc::DesktopFrame* frame);
-
-  // Returns the number of bits |mask| has to be shifted left so its last
-  // (most-significant) bit set becomes the most-significant bit of the word.
-  // When |mask| is 0 the function returns 31.
-  static uint32 GetRgbShift(uint32 mask);
-
-  Callback* callback_;
-  MouseShapeObserver* mouse_shape_observer_;
-
-  // X11 graphics context.
-  Display* display_;
-  GC gc_;
-  Window root_window_;
-
-  // Last known dimensions of the root window.
-  webrtc::DesktopSize root_window_size_;
-
-  // XFixes.
-  bool has_xfixes_;
-  int xfixes_event_base_;
-  int xfixes_error_base_;
-
-  // XDamage information.
-  bool use_damage_;
-  Damage damage_handle_;
-  int damage_event_base_;
-  int damage_error_base_;
-  XserverRegion damage_region_;
-
-  // Access to the X Server's pixel buffer.
-  XServerPixelBuffer x_server_pixel_buffer_;
-
-  // A thread-safe list of invalid rectangles, and the size of the most
-  // recently captured screen.
-  ScreenCapturerHelper helper_;
-
-  // Queue of the frames buffers.
-  ScreenCaptureFrameQueue queue_;
-
-  // Invalid region from the previous capture. This is used to synchronize the
-  // current with the last buffer used.
-  webrtc::DesktopRegion last_invalid_region_;
-
-  // |Differ| for use when polling for changes.
-  scoped_ptr<Differ> differ_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenCapturerLinux);
-};
-
-ScreenCapturerLinux::ScreenCapturerLinux()
-    : callback_(NULL),
-      mouse_shape_observer_(NULL),
-      display_(NULL),
-      gc_(NULL),
-      root_window_(BadValue),
-      has_xfixes_(false),
-      xfixes_event_base_(-1),
-      xfixes_error_base_(-1),
-      use_damage_(false),
-      damage_handle_(0),
-      damage_event_base_(-1),
-      damage_error_base_(-1),
-      damage_region_(0) {
-  helper_.SetLogGridSize(4);
-}
-
-ScreenCapturerLinux::~ScreenCapturerLinux() {
-  DeinitXlib();
-}
-
-bool ScreenCapturerLinux::Init(bool use_x_damage) {
-  // TODO(ajwong): We should specify the display string we are attaching to
-  // in the constructor.
-  display_ = XOpenDisplay(NULL);
-  if (!display_) {
-    LOG(ERROR) << "Unable to open display";
-    return false;
-  }
-
-  root_window_ = RootWindow(display_, DefaultScreen(display_));
-  if (root_window_ == BadValue) {
-    LOG(ERROR) << "Unable to get the root window";
-    DeinitXlib();
-    return false;
-  }
-
-  gc_ = XCreateGC(display_, root_window_, 0, NULL);
-  if (gc_ == NULL) {
-    LOG(ERROR) << "Unable to get graphics context";
-    DeinitXlib();
-    return false;
-  }
-
-  // Check for XFixes extension. This is required for cursor shape
-  // notifications, and for our use of XDamage.
-  if (XFixesQueryExtension(display_, &xfixes_event_base_,
-                           &xfixes_error_base_)) {
-    has_xfixes_ = true;
-  } else {
-    LOG(INFO) << "X server does not support XFixes.";
-  }
-
-  // Register for changes to the dimensions of the root window.
-  XSelectInput(display_, root_window_, StructureNotifyMask);
-
-  root_window_size_ = XServerPixelBuffer::GetRootWindowSize(display_);
-  x_server_pixel_buffer_.Init(display_, root_window_size_);
-
-  if (has_xfixes_) {
-    // Register for changes to the cursor shape.
-    XFixesSelectCursorInput(display_, root_window_,
-                            XFixesDisplayCursorNotifyMask);
-  }
-
-  if (use_x_damage) {
-    InitXDamage();
-  }
-
-  return true;
-}
-
-void ScreenCapturerLinux::InitXDamage() {
-  // Our use of XDamage requires XFixes.
-  if (!has_xfixes_) {
-    return;
-  }
-
-  // Check for XDamage extension.
-  if (!XDamageQueryExtension(display_, &damage_event_base_,
-                             &damage_error_base_)) {
-    LOG(INFO) << "X server does not support XDamage.";
-    return;
-  }
-
-  // TODO(lambroslambrou): Disable DAMAGE in situations where it is known
-  // to fail, such as when Desktop Effects are enabled, with graphics
-  // drivers (nVidia, ATI) that fail to report DAMAGE notifications
-  // properly.
-
-  // Request notifications every time the screen becomes damaged.
-  damage_handle_ = XDamageCreate(display_, root_window_,
-                                 XDamageReportNonEmpty);
-  if (!damage_handle_) {
-    LOG(ERROR) << "Unable to initialize XDamage.";
-    return;
-  }
-
-  // Create an XFixes server-side region to collate damage into.
-  damage_region_ = XFixesCreateRegion(display_, 0, 0);
-  if (!damage_region_) {
-    XDamageDestroy(display_, damage_handle_);
-    LOG(ERROR) << "Unable to create XFixes region.";
-    return;
-  }
-
-  use_damage_ = true;
-  LOG(INFO) << "Using XDamage extension.";
-}
-
-void ScreenCapturerLinux::Start(Callback* callback) {
-  DCHECK(!callback_);
-  DCHECK(callback);
-
-  callback_ = callback;
-}
-
-void ScreenCapturerLinux::Capture(const webrtc::DesktopRegion& region) {
-  base::Time capture_start_time = base::Time::Now();
-
-  queue_.MoveToNextFrame();
-
-  // Process XEvents for XDamage and cursor shape tracking.
-  ProcessPendingXEvents();
-
-  // If the current frame is from an older generation then allocate a new one.
-  // Note that we can't reallocate other buffers at this point, since the caller
-  // may still be reading from them.
-  if (!queue_.current_frame()) {
-    scoped_ptr<webrtc::DesktopFrame> frame(
-        new webrtc::BasicDesktopFrame(root_window_size_));
-    queue_.ReplaceCurrentFrame(frame.Pass());
-  }
-
-  // Refresh the Differ helper used by CaptureFrame(), if needed.
-  webrtc::DesktopFrame* frame = queue_.current_frame();
-  if (!use_damage_ && (
-      !differ_.get() ||
-      (differ_->width() != frame->size().width()) ||
-      (differ_->height() != frame->size().height()) ||
-      (differ_->bytes_per_row() != frame->stride()))) {
-    differ_.reset(new Differ(frame->size().width(), frame->size().height(),
-                             webrtc::DesktopFrame::kBytesPerPixel,
-                             frame->stride()));
-  }
-
-  webrtc::DesktopFrame* result = CaptureScreen();
-  last_invalid_region_ = result->updated_region();
-  result->set_capture_time_ms(
-      (base::Time::Now() - capture_start_time).InMillisecondsRoundedUp());
-  callback_->OnCaptureCompleted(result);
-}
-
-void ScreenCapturerLinux::SetMouseShapeObserver(
-      MouseShapeObserver* mouse_shape_observer) {
-  DCHECK(!mouse_shape_observer_);
-  DCHECK(mouse_shape_observer);
-
-  mouse_shape_observer_ = mouse_shape_observer;
-}
-
-void ScreenCapturerLinux::ProcessPendingXEvents() {
-  // Find the number of events that are outstanding "now."  We don't just loop
-  // on XPending because we want to guarantee this terminates.
-  int events_to_process = XPending(display_);
-  XEvent e;
-
-  for (int i = 0; i < events_to_process; i++) {
-    XNextEvent(display_, &e);
-    if (use_damage_ && (e.type == damage_event_base_ + XDamageNotify)) {
-      XDamageNotifyEvent* event = reinterpret_cast<XDamageNotifyEvent*>(&e);
-      DCHECK(event->level == XDamageReportNonEmpty);
-    } else if (e.type == ConfigureNotify) {
-      const XConfigureEvent& event = e.xconfigure;
-      ScreenConfigurationChanged(
-          webrtc::DesktopSize(event.width, event.height));
-    } else if (has_xfixes_ &&
-               e.type == xfixes_event_base_ + XFixesCursorNotify) {
-      XFixesCursorNotifyEvent* cne;
-      cne = reinterpret_cast<XFixesCursorNotifyEvent*>(&e);
-      if (cne->subtype == XFixesDisplayCursorNotify) {
-        CaptureCursor();
-      }
-    } else {
-      LOG(WARNING) << "Got unknown event type: " << e.type;
-    }
-  }
-}
-
-void ScreenCapturerLinux::CaptureCursor() {
-  DCHECK(has_xfixes_);
-
-  XFixesCursorImage* img = XFixesGetCursorImage(display_);
-  if (!img) {
-    return;
-  }
-
-  scoped_ptr<MouseCursorShape> cursor(new MouseCursorShape());
-  cursor->size = webrtc::DesktopSize(img->width, img->height);
-  cursor->hotspot = webrtc::DesktopVector(img->xhot, img->yhot);
-
-  int total_bytes = cursor->size.width ()* cursor->size.height() *
-      webrtc::DesktopFrame::kBytesPerPixel;
-  cursor->data.resize(total_bytes);
-
-  // Xlib stores 32-bit data in longs, even if longs are 64-bits long.
-  unsigned long* src = img->pixels;
-  uint32* dst = reinterpret_cast<uint32*>(&*(cursor->data.begin()));
-  uint32* dst_end = dst + (img->width * img->height);
-  while (dst < dst_end) {
-    *dst++ = static_cast<uint32>(*src++);
-  }
-  XFree(img);
-
-  if (mouse_shape_observer_)
-    mouse_shape_observer_->OnCursorShapeChanged(cursor.Pass());
-}
-
-webrtc::DesktopFrame* ScreenCapturerLinux::CaptureScreen() {
-  webrtc::DesktopFrame* frame = queue_.current_frame()->Share();
-
-  // Pass the screen size to the helper, so it can clip the invalid region if it
-  // expands that region to a grid.
-  helper_.set_size_most_recent(frame->size());
-
-  // In the DAMAGE case, ensure the frame is up-to-date with the previous frame
-  // if any.  If there isn't a previous frame, that means a screen-resolution
-  // change occurred, and |invalid_rects| will be updated to include the whole
-  // screen.
-  if (use_damage_ && queue_.previous_frame())
-    SynchronizeFrame();
-
-  webrtc::DesktopRegion* updated_region = frame->mutable_updated_region();
-
-  x_server_pixel_buffer_.Synchronize();
-  if (use_damage_ && queue_.previous_frame()) {
-    // Atomically fetch and clear the damage region.
-    XDamageSubtract(display_, damage_handle_, None, damage_region_);
-    int rects_num = 0;
-    XRectangle bounds;
-    XRectangle* rects = XFixesFetchRegionAndBounds(display_, damage_region_,
-                                                   &rects_num, &bounds);
-    for (int i = 0; i < rects_num; ++i) {
-      updated_region->AddRect(webrtc::DesktopRect::MakeXYWH(
-          rects[i].x, rects[i].y, rects[i].width, rects[i].height));
-    }
-    XFree(rects);
-    helper_.InvalidateRegion(*updated_region);
-
-    // Capture the damaged portions of the desktop.
-    helper_.TakeInvalidRegion(updated_region);
-
-    // Clip the damaged portions to the current screen size, just in case some
-    // spurious XDamage notifications were received for a previous (larger)
-    // screen size.
-    updated_region->IntersectWith(
-        webrtc::DesktopRect::MakeSize(root_window_size_));
-    for (webrtc::DesktopRegion::Iterator it(*updated_region);
-         !it.IsAtEnd(); it.Advance()) {
-      CaptureRect(it.rect(), frame);
-    }
-  } else {
-    // Doing full-screen polling, or this is the first capture after a
-    // screen-resolution change.  In either case, need a full-screen capture.
-    webrtc::DesktopRect screen_rect =
-        webrtc::DesktopRect::MakeSize(frame->size());
-    CaptureRect(screen_rect, frame);
-
-    if (queue_.previous_frame()) {
-      // Full-screen polling, so calculate the invalid rects here, based on the
-      // changed pixels between current and previous buffers.
-      DCHECK(differ_ != NULL);
-      DCHECK(queue_.previous_frame()->data());
-      differ_->CalcDirtyRegion(queue_.previous_frame()->data(),
-                               frame->data(), updated_region);
-    } else {
-      // No previous buffer, so always invalidate the whole screen, whether
-      // or not DAMAGE is being used.  DAMAGE doesn't necessarily send a
-      // full-screen notification after a screen-resolution change, so
-      // this is done here.
-      updated_region->SetRect(screen_rect);
-    }
-  }
-
-  return frame;
-}
-
-void ScreenCapturerLinux::ScreenConfigurationChanged(
-    const webrtc::DesktopSize& root_window_size) {
-  root_window_size_ = root_window_size;
-
-  // Make sure the frame buffers will be reallocated.
-  queue_.Reset();
-
-  helper_.ClearInvalidRegion();
-  x_server_pixel_buffer_.Init(display_, root_window_size_);
-}
-
-void ScreenCapturerLinux::SynchronizeFrame() {
-  // Synchronize the current buffer with the previous one since we do not
-  // capture the entire desktop. Note that encoder may be reading from the
-  // previous buffer at this time so thread access complaints are false
-  // positives.
-
-  // TODO(hclam): We can reduce the amount of copying here by subtracting
-  // |capturer_helper_|s region from |last_invalid_region_|.
-  // http://crbug.com/92354
-  DCHECK(queue_.previous_frame());
-
-  webrtc::DesktopFrame* current = queue_.current_frame();
-  webrtc::DesktopFrame* last = queue_.previous_frame();
-  DCHECK_NE(current, last);
-  for (webrtc::DesktopRegion::Iterator it(last_invalid_region_);
-       !it.IsAtEnd(); it.Advance()) {
-    const webrtc::DesktopRect& r = it.rect();
-    int offset = r.top() * current->stride() +
-        r.left() * webrtc::DesktopFrame::kBytesPerPixel;
-    for (int i = 0; i < r.height(); ++i) {
-      memcpy(current->data() + offset, last->data() + offset,
-             r.width() * webrtc::DesktopFrame::kBytesPerPixel);
-      offset += current->size().width() * webrtc::DesktopFrame::kBytesPerPixel;
-    }
-  }
-}
-
-void ScreenCapturerLinux::DeinitXlib() {
-  if (gc_) {
-    XFreeGC(display_, gc_);
-    gc_ = NULL;
-  }
-
-  x_server_pixel_buffer_.Release();
-
-  if (display_) {
-    if (damage_handle_)
-      XDamageDestroy(display_, damage_handle_);
-    if (damage_region_)
-      XFixesDestroyRegion(display_, damage_region_);
-    XCloseDisplay(display_);
-    display_ = NULL;
-    damage_handle_ = 0;
-    damage_region_ = 0;
-  }
-}
-
-void ScreenCapturerLinux::CaptureRect(const webrtc::DesktopRect& rect,
-                                      webrtc::DesktopFrame* frame) {
-  uint8* image = x_server_pixel_buffer_.CaptureRect(rect);
-  int depth = x_server_pixel_buffer_.GetDepth();
-  if ((depth == 24 || depth == 32) &&
-      x_server_pixel_buffer_.GetBitsPerPixel() == 32 &&
-      x_server_pixel_buffer_.GetRedMask() == 0xff0000 &&
-      x_server_pixel_buffer_.GetGreenMask() == 0xff00 &&
-      x_server_pixel_buffer_.GetBlueMask() == 0xff) {
-    DVLOG(3) << "Fast blitting";
-    FastBlit(image, rect, frame);
-  } else {
-    DVLOG(3) << "Slow blitting";
-    SlowBlit(image, rect, frame);
-  }
-}
-
-void ScreenCapturerLinux::FastBlit(uint8* image,
-                                   const webrtc::DesktopRect& rect,
-                                   webrtc::DesktopFrame* frame) {
-  uint8* src_pos = image;
-  int src_stride = x_server_pixel_buffer_.GetStride();
-  int dst_x = rect.left(), dst_y = rect.top();
-
-  uint8* dst_pos = frame->data() + frame->stride() * dst_y;
-  dst_pos += dst_x * webrtc::DesktopFrame::kBytesPerPixel;
-
-  int height = rect.height();
-  int row_bytes = rect.width() * webrtc::DesktopFrame::kBytesPerPixel;
-  for (int y = 0; y < height; ++y) {
-    memcpy(dst_pos, src_pos, row_bytes);
-    src_pos += src_stride;
-    dst_pos += frame->stride();
-  }
-}
-
-void ScreenCapturerLinux::SlowBlit(uint8* image,
-                                   const webrtc::DesktopRect& rect,
-                                   webrtc::DesktopFrame* frame) {
-  int src_stride = x_server_pixel_buffer_.GetStride();
-  int dst_x = rect.left(), dst_y = rect.top();
-  int width = rect.width(), height = rect.height();
-
-  uint32 red_mask = x_server_pixel_buffer_.GetRedMask();
-  uint32 green_mask = x_server_pixel_buffer_.GetGreenMask();
-  uint32 blue_mask = x_server_pixel_buffer_.GetBlueMask();
-
-  uint32 red_shift = GetRgbShift(red_mask);
-  uint32 green_shift = GetRgbShift(green_mask);
-  uint32 blue_shift = GetRgbShift(blue_mask);
-
-  unsigned int bits_per_pixel = x_server_pixel_buffer_.GetBitsPerPixel();
-
-  uint8* dst_pos = frame->data() + frame->stride() * dst_y;
-  uint8* src_pos = image;
-  dst_pos += dst_x * webrtc::DesktopFrame::kBytesPerPixel;
-  // TODO(hclam): Optimize, perhaps using MMX code or by converting to
-  // YUV directly
-  for (int y = 0; y < height; y++) {
-    uint32* dst_pos_32 = reinterpret_cast<uint32*>(dst_pos);
-    uint32* src_pos_32 = reinterpret_cast<uint32*>(src_pos);
-    uint16* src_pos_16 = reinterpret_cast<uint16*>(src_pos);
-    for (int x = 0; x < width; x++) {
-      // Dereference through an appropriately-aligned pointer.
-      uint32 pixel;
-      if (bits_per_pixel == 32)
-        pixel = src_pos_32[x];
-      else if (bits_per_pixel == 16)
-        pixel = src_pos_16[x];
-      else
-        pixel = src_pos[x];
-      uint32 r = (pixel & red_mask) << red_shift;
-      uint32 g = (pixel & green_mask) << green_shift;
-      uint32 b = (pixel & blue_mask) << blue_shift;
-
-      // Write as 32-bit RGB.
-      dst_pos_32[x] = ((r >> 8) & 0xff0000) | ((g >> 16) & 0xff00) |
-          ((b >> 24) & 0xff);
-    }
-    dst_pos += frame->stride();
-    src_pos += src_stride;
-  }
-}
-
-// static
-uint32 ScreenCapturerLinux::GetRgbShift(uint32 mask) {
-  int shift = 0;
-  if ((mask & 0xffff0000u) == 0) {
-    mask <<= 16;
-    shift += 16;
-  }
-  if ((mask & 0xff000000u) == 0) {
-    mask <<= 8;
-    shift += 8;
-  }
-  if ((mask & 0xf0000000u) == 0) {
-    mask <<= 4;
-    shift += 4;
-  }
-  if ((mask & 0xc0000000u) == 0) {
-    mask <<= 2;
-    shift += 2;
-  }
-  if ((mask & 0x80000000u) == 0)
-    shift += 1;
-
-  return shift;
-}
-
-}  // namespace
-
-// static
-scoped_ptr<ScreenCapturer> ScreenCapturer::Create() {
-  scoped_ptr<ScreenCapturerLinux> capturer(new ScreenCapturerLinux());
-  if (!capturer->Init(false))
-    capturer.reset();
-  return capturer.PassAs<ScreenCapturer>();
-}
-
-// static
-scoped_ptr<ScreenCapturer> ScreenCapturer::CreateWithXDamage(
-    bool use_x_damage) {
-  scoped_ptr<ScreenCapturerLinux> capturer(new ScreenCapturerLinux());
-  if (!capturer->Init(use_x_damage))
-    capturer.reset();
-  return capturer.PassAs<ScreenCapturer>();
-}
-
-}  // namespace media