remoting/protocol/mouse_input_filter.cc

   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/protocol/mouse_input_filter.h"
   6
   7 #include "remoting/proto/event.pb.h"
   8
   9 namespace remoting {
  10 namespace protocol {
  11
  12 MouseInputFilter::MouseInputFilter() {
  13 }
  14
  15 MouseInputFilter::MouseInputFilter(InputStub* input_stub)
  16     : InputFilter(input_stub) {
  17 }
  18
  19 MouseInputFilter::~MouseInputFilter() {
  20 }
  21
  22 void MouseInputFilter::InjectMouseEvent(const MouseEvent& event) {
  23   if (input_max_.is_empty() || output_max_.is_empty())
  24     return;
  25
  26   // We scale based on the maximum input & output coordinates, rather than the
  27   // input and output sizes, so that it's possible to reach the edge of the
  28   // output when up-scaling.  We also take care to round up or down correctly,
  29   // which is important when down-scaling.
  30   MouseEvent out_event(event);
  31   if (out_event.has_x()) {
  32     int x = out_event.x() * output_max_.width();
  33     x = (x + input_max_.width() / 2) / input_max_.width();
  34     out_event.set_x(std::max(0, std::min(output_max_.width(), x)));
  35   }
  36   if (out_event.has_y()) {
  37     int y = out_event.y() * output_max_.height();
  38     y = (y + input_max_.height() / 2) / input_max_.height();
  39     out_event.set_y(std::max(0, std::min(output_max_.height(), y)));
  40   }
  41
  42   InputFilter::InjectMouseEvent(out_event);
  43 }
  44
  45 void MouseInputFilter::set_input_size(const webrtc::DesktopSize& size) {
  46   input_max_.set(size.width() - 1, size.height() - 1);
  47 }
  48
  49 void MouseInputFilter::set_output_size(const webrtc::DesktopSize& size) {
  50   output_max_.set(size.width() - 1, size.height() - 1);
  51 }
  52
  53 }  // namespace protocol
  54 }  // namespace remoting