remoting/host: Rename Capturer to VideoFrameCapturer.

remoting/host/capturer_linux.cc

Index: remoting/host/capturer_linux.cc
diff --git a/remoting/host/capturer_linux.cc b/remoting/host/capturer_linux.cc
deleted file mode 100644
index 3a1f22dd15f67277837e42af0e6f8818b5daef8f..0000000000000000000000000000000000000000
--- a/remoting/host/capturer_linux.cc
+++ /dev/null
@@ -1,638 +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 "remoting/host/capturer.h"
-
-#include <X11/Xlib.h>
-#include <X11/Xutil.h>
-#include <X11/extensions/Xdamage.h>
-#include <X11/extensions/Xfixes.h>
-
-#include <set>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "remoting/base/capture_data.h"
-#include "remoting/host/capturer_helper.h"
-#include "remoting/host/differ.h"
-#include "remoting/host/x_server_pixel_buffer.h"
-#include "remoting/proto/control.pb.h"
-
-namespace remoting {
-
-namespace {
-
-static const int kBytesPerPixel = 4;
-
-// Default to false, since many systems have broken XDamage support - see
-// http://crbug.com/73423.
-static bool g_should_use_x_damage = false;
-
-static bool ShouldUseXDamage() {
-  return g_should_use_x_damage;
-}
-
-// A class representing a full-frame pixel buffer
-class VideoFrameBuffer {
- public:
-  VideoFrameBuffer() : bytes_per_row_(0), needs_update_(true) {
-    size_.set(0, 0);
-  }
-
-  void Update(Display* display, Window root_window) {
-    if (needs_update_) {
-      needs_update_ = false;
-      XWindowAttributes root_attr;
-      XGetWindowAttributes(display, root_window, &root_attr);
-      if (root_attr.width != size_.width() ||
-          root_attr.height != size_.height()) {
-        size_.set(root_attr.width, root_attr.height);
-        bytes_per_row_ = size_.width() * kBytesPerPixel;
-        size_t buffer_size = size_.width() * size_.height() * kBytesPerPixel;
-        ptr_.reset(new uint8[buffer_size]);
-      }
-    }
-  }
-
-  SkISize size() const { return size_; }
-  int bytes_per_row() const { return bytes_per_row_; }
-  uint8* ptr() const { return ptr_.get(); }
-
-  void set_needs_update() { needs_update_ = true; }
-
- private:
-  SkISize size_;
-  int bytes_per_row_;
-  scoped_array<uint8> ptr_;
-  bool needs_update_;
-
-  DISALLOW_COPY_AND_ASSIGN(VideoFrameBuffer);
-};
-
-// A class to perform capturing for Linux.
-class CapturerLinux : public Capturer {
- public:
-  CapturerLinux();
-  virtual ~CapturerLinux();
-
-  bool Init();  // TODO(ajwong): Do we really want this to be synchronous?
-
-  // Capturer interface.
-  virtual void Start(const CursorShapeChangedCallback& callback) OVERRIDE;
-  virtual void Stop() OVERRIDE;
-  virtual void ScreenConfigurationChanged() OVERRIDE;
-  virtual media::VideoFrame::Format pixel_format() const OVERRIDE;
-  virtual void ClearInvalidRegion() OVERRIDE;
-  virtual void InvalidateRegion(const SkRegion& invalid_region) OVERRIDE;
-  virtual void InvalidateScreen(const SkISize& size) OVERRIDE;
-  virtual void InvalidateFullScreen() OVERRIDE;
-  virtual void CaptureInvalidRegion(
-      const CaptureCompletedCallback& callback) OVERRIDE;
-  virtual const SkISize& size_most_recent() const 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 CapturerHelper.
-  // In all cases, call ScreenConfigurationChanged() in response to any
-  // ConfigNotify events.
-  void ProcessPendingXEvents();
-
-  // Capture screen pixels, and return the data in a new CaptureData object,
-  // to be freed by the caller.
-  // In the DAMAGE case, the CapturerHelper 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.
-  CaptureData* CaptureFrame();
-
-  // Capture the cursor image and call the CursorShapeChangedCallback if it
-  // has been set (using SetCursorShapeChangedCallback).
-  void CaptureCursor();
-
-  // 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
-  // |capture_data|.
-  void CaptureRect(const SkIRect& rect, CaptureData* capture_data);
-
-  // 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 SkIRect& rect, CaptureData* capture_data);
-  void SlowBlit(uint8* image, const SkIRect& rect, CaptureData* capture_data);
-
-  // X11 graphics context.
-  Display* display_;
-  GC gc_;
-  Window root_window_;
-
-  // 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.
-  CapturerHelper helper_;
-
-  // Callback notified whenever the cursor shape is changed.
-  CursorShapeChangedCallback cursor_shape_changed_callback_;
-
-  // Capture state.
-  static const int kNumBuffers = 2;
-  VideoFrameBuffer buffers_[kNumBuffers];
-  int current_buffer_;
-
-  // Format of pixels returned in buffer.
-  media::VideoFrame::Format pixel_format_;
-
-  // Invalid region from the previous capture. This is used to synchronize the
-  // current with the last buffer used.
-  SkRegion last_invalid_region_;
-
-  // Last capture buffer used.
-  uint8* last_buffer_;
-
-  // |Differ| for use when polling for changes.
-  scoped_ptr<Differ> differ_;
-
-  DISALLOW_COPY_AND_ASSIGN(CapturerLinux);
-};
-
-CapturerLinux::CapturerLinux()
-    : 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),
-      current_buffer_(0),
-      pixel_format_(media::VideoFrame::RGB32),
-      last_buffer_(NULL) {
-  helper_.SetLogGridSize(4);
-}
-
-CapturerLinux::~CapturerLinux() {
-  DeinitXlib();
-}
-
-bool CapturerLinux::Init() {
-  // 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;
-  }
-
-  x_server_pixel_buffer_.Init(display_);
-
-  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.";
-  }
-
-  if (ShouldUseXDamage()) {
-    InitXDamage();
-  }
-
-  // Register for changes to the dimensions of the root window.
-  XSelectInput(display_, root_window_, StructureNotifyMask);
-
-  if (has_xfixes_) {
-    // Register for changes to the cursor shape.
-    XFixesSelectCursorInput(display_, root_window_,
-                            XFixesDisplayCursorNotifyMask);
-  }
-
-  return true;
-}
-
-void CapturerLinux::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 CapturerLinux::Start(
-    const CursorShapeChangedCallback& callback) {
-  cursor_shape_changed_callback_ = callback;
-}
-
-void CapturerLinux::Stop() {
-}
-
-void CapturerLinux::ScreenConfigurationChanged() {
-  last_buffer_ = NULL;
-  for (int i = 0; i < kNumBuffers; ++i) {
-    buffers_[i].set_needs_update();
-  }
-  helper_.ClearInvalidRegion();
-  x_server_pixel_buffer_.Init(display_);
-}
-
-media::VideoFrame::Format CapturerLinux::pixel_format() const {
-  return pixel_format_;
-}
-
-void CapturerLinux::ClearInvalidRegion() {
-  helper_.ClearInvalidRegion();
-}
-
-void CapturerLinux::InvalidateRegion(const SkRegion& invalid_region) {
-  helper_.InvalidateRegion(invalid_region);
-}
-
-void CapturerLinux::InvalidateScreen(const SkISize& size) {
-  helper_.InvalidateScreen(size);
-}
-
-void CapturerLinux::InvalidateFullScreen() {
-  helper_.InvalidateFullScreen();
-  last_buffer_ = NULL;
-}
-
-void CapturerLinux::CaptureInvalidRegion(
-    const CaptureCompletedCallback& callback) {
-  // Process XEvents for XDamage and cursor shape tracking.
-  ProcessPendingXEvents();
-
-  // Resize the current buffer if there was a recent change of
-  // screen-resolution.
-  VideoFrameBuffer &current = buffers_[current_buffer_];
-  current.Update(display_, root_window_);
-  // Also refresh the Differ helper used by CaptureFrame(), if needed.
-  if (!use_damage_ && !last_buffer_) {
-    differ_.reset(new Differ(current.size().width(), current.size().height(),
-                             kBytesPerPixel, current.bytes_per_row()));
-  }
-
-  scoped_refptr<CaptureData> capture_data(CaptureFrame());
-
-  current_buffer_ = (current_buffer_ + 1) % kNumBuffers;
-
-  callback.Run(capture_data);
-}
-
-void CapturerLinux::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) {
-      ScreenConfigurationChanged();
-    } 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 CapturerLinux::CaptureCursor() {
-  DCHECK(has_xfixes_);
-  if (cursor_shape_changed_callback_.is_null())
-    return;
-
-  XFixesCursorImage* img = XFixesGetCursorImage(display_);
-  if (!img) {
-    return;
-  }
-
-  int width = img->width;
-  int height = img->height;
-  int total_bytes = width * height * kBytesPerPixel;
-
-  scoped_ptr<protocol::CursorShapeInfo> cursor_proto(
-      new protocol::CursorShapeInfo());
-  cursor_proto->set_width(width);
-  cursor_proto->set_height(height);
-  cursor_proto->set_hotspot_x(img->xhot);
-  cursor_proto->set_hotspot_y(img->yhot);
-
-  cursor_proto->mutable_data()->resize(total_bytes);
-  uint8* proto_data = const_cast<uint8*>(reinterpret_cast<const uint8*>(
-      cursor_proto->mutable_data()->data()));
-
-  // Xlib stores 32-bit data in longs, even if longs are 64-bits long.
-  unsigned long* src = img->pixels;
-  uint32* dst = reinterpret_cast<uint32*>(proto_data);
-  uint32* dst_end = dst + (width * height);
-  while (dst < dst_end) {
-    *dst++ = static_cast<uint32>(*src++);
-  }
-  XFree(img);
-
-  cursor_shape_changed_callback_.Run(cursor_proto.Pass());
-}
-
-CaptureData* CapturerLinux::CaptureFrame() {
-  VideoFrameBuffer& buffer = buffers_[current_buffer_];
-  DataPlanes planes;
-  planes.data[0] = buffer.ptr();
-  planes.strides[0] = buffer.bytes_per_row();
-
-  CaptureData* capture_data = new CaptureData(planes, buffer.size(),
-                                              media::VideoFrame::RGB32);
-
-  // 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(capture_data->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_ && last_buffer_)
-    SynchronizeFrame();
-
-  SkRegion invalid_region;
-
-  x_server_pixel_buffer_.Synchronize();
-  if (use_damage_ && last_buffer_) {
-    // Atomically fetch and clear the damage region.
-    XDamageSubtract(display_, damage_handle_, None, damage_region_);
-    int nRects = 0;
-    XRectangle bounds;
-    XRectangle* rects = XFixesFetchRegionAndBounds(display_, damage_region_,
-                                                   &nRects, &bounds);
-    for (int i=0; i<nRects; ++i) {
-      invalid_region.op(SkIRect::MakeXYWH(rects[i].x, rects[i].y,
-                                          rects[i].width, rects[i].height),
-                        SkRegion::kUnion_Op);
-    }
-    XFree(rects);
-    helper_.InvalidateRegion(invalid_region);
-
-    // Capture the damaged portions of the desktop.
-    helper_.SwapInvalidRegion(&invalid_region);
-    for (SkRegion::Iterator it(invalid_region); !it.done(); it.next()) {
-      CaptureRect(it.rect(), capture_data);
-    }
-  } else {
-    // Doing full-screen polling, or this is the first capture after a
-    // screen-resolution change.  In either case, need a full-screen capture.
-    SkIRect screen_rect = SkIRect::MakeWH(buffer.size().width(),
-                                          buffer.size().height());
-    CaptureRect(screen_rect, capture_data);
-
-    if (last_buffer_) {
-      // Full-screen polling, so calculate the invalid rects here, based on the
-      // changed pixels between current and previous buffers.
-      DCHECK(differ_ != NULL);
-      differ_->CalcDirtyRegion(last_buffer_, buffer.ptr(), &invalid_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.
-      invalid_region.op(screen_rect, SkRegion::kUnion_Op);
-    }
-  }
-
-  capture_data->mutable_dirty_region() = invalid_region;
-  last_invalid_region_ = invalid_region;
-  last_buffer_ = buffer.ptr();
-  return capture_data;
-}
-
-void CapturerLinux::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(last_buffer_);
-  VideoFrameBuffer& buffer = buffers_[current_buffer_];
-  for (SkRegion::Iterator it(last_invalid_region_); !it.done(); it.next()) {
-    const SkIRect& r = it.rect();
-    int offset = r.fTop * buffer.bytes_per_row() + r.fLeft * kBytesPerPixel;
-    for (int i = 0; i < r.height(); ++i) {
-      memcpy(buffer.ptr() + offset, last_buffer_ + offset,
-             r.width() * kBytesPerPixel);
-      offset += buffer.size().width() * kBytesPerPixel;
-    }
-  }
-}
-
-void CapturerLinux::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 CapturerLinux::CaptureRect(const SkIRect& rect,
-                                CaptureData* capture_data) {
-  uint8* image = x_server_pixel_buffer_.CaptureRect(rect);
-  int depth = x_server_pixel_buffer_.GetDepth();
-  int bpp = x_server_pixel_buffer_.GetBitsPerPixel();
-  bool is_rgb = x_server_pixel_buffer_.IsRgb();
-  if ((depth == 24 || depth == 32) && bpp == 32 && is_rgb) {
-    DVLOG(3) << "Fast blitting";
-    FastBlit(image, rect, capture_data);
-  } else {
-    DVLOG(3) << "Slow blitting";
-    SlowBlit(image, rect, capture_data);
-  }
-}
-
-void CapturerLinux::FastBlit(uint8* image, const SkIRect& rect,
-                             CaptureData* capture_data) {
-  uint8* src_pos = image;
-  int src_stride = x_server_pixel_buffer_.GetStride();
-  int dst_x = rect.fLeft, dst_y = rect.fTop;
-
-  DataPlanes planes = capture_data->data_planes();
-  uint8* dst_buffer = planes.data[0];
-
-  const int dst_stride = planes.strides[0];
-
-  uint8* dst_pos = dst_buffer + dst_stride * dst_y;
-  dst_pos += dst_x * kBytesPerPixel;
-
-  int height = rect.height(), row_bytes = rect.width() * kBytesPerPixel;
-  for (int y = 0; y < height; ++y) {
-    memcpy(dst_pos, src_pos, row_bytes);
-    src_pos += src_stride;
-    dst_pos += dst_stride;
-  }
-}
-
-void CapturerLinux::SlowBlit(uint8* image, const SkIRect& rect,
-                             CaptureData* capture_data) {
-  DataPlanes planes = capture_data->data_planes();
-  uint8* dst_buffer = planes.data[0];
-  const int dst_stride = planes.strides[0];
-  int src_stride = x_server_pixel_buffer_.GetStride();
-  int dst_x = rect.fLeft, dst_y = rect.fTop;
-  int width = rect.width(), height = rect.height();
-
-  unsigned int red_mask = x_server_pixel_buffer_.GetRedMask();
-  unsigned int blue_mask = x_server_pixel_buffer_.GetBlueMask();
-  unsigned int green_mask = x_server_pixel_buffer_.GetGreenMask();
-  unsigned int red_shift = x_server_pixel_buffer_.GetRedShift();
-  unsigned int blue_shift = x_server_pixel_buffer_.GetBlueShift();
-  unsigned int green_shift = x_server_pixel_buffer_.GetGreenShift();
-
-  unsigned int max_red = red_mask >> red_shift;
-  unsigned int max_blue = blue_mask >> blue_shift;
-  unsigned int max_green = green_mask >> green_shift;
-
-  unsigned int bits_per_pixel = x_server_pixel_buffer_.GetBitsPerPixel();
-
-  uint8* dst_pos = dst_buffer + dst_stride * dst_y;
-  uint8* src_pos = image;
-  dst_pos += dst_x * kBytesPerPixel;
-  // TODO(hclam): Optimize, perhaps using MMX code or by converting to
-  // YUV directly
-  for (int y = 0; y < height; y++) {
-    uint32_t* dst_pos_32 = reinterpret_cast<uint32_t*>(dst_pos);
-    uint32_t* src_pos_32 = reinterpret_cast<uint32_t*>(src_pos);
-    uint16_t* src_pos_16 = reinterpret_cast<uint16_t*>(src_pos);
-    for (int x = 0; x < width; x++) {
-      // Dereference through an appropriately-aligned pointer.
-      uint32_t 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_t r = (((pixel & red_mask) >> red_shift) * 255) / max_red;
-      uint32_t b = (((pixel & blue_mask) >> blue_shift) * 255) / max_blue;
-      uint32_t g = (((pixel & green_mask) >> green_shift) * 255) / max_green;
-      // Write as 32-bit RGB.
-      dst_pos_32[x] = r << 16 | g << 8 | b;
-    }
-    dst_pos += dst_stride;
-    src_pos += src_stride;
-  }
-}
-
-const SkISize& CapturerLinux::size_most_recent() const {
-  return helper_.size_most_recent();
-}
-
-}  // namespace
-
-// static
-Capturer* Capturer::Create() {
-  CapturerLinux* capturer = new CapturerLinux();
-  if (!capturer->Init()) {
-    delete capturer;
-    capturer = NULL;
-  }
-  return capturer;
-}
-
-// static
-void Capturer::EnableXDamage(bool enable) {
-  g_should_use_x_damage = enable;
-}
-
-}  // namespace remoting