Clamp events before they are sent to EventExecutors.

remoting/client/mouse_input_filter.cc

-// Copyright (c) 2011 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/client/mouse_input_filter.h"
-
-#include "remoting/proto/event.pb.h"
-
-namespace remoting {
-
-MouseInputFilter::MouseInputFilter(protocol::InputStub* input_stub)
-    : input_stub_(input_stub) {
-  input_max_.setEmpty();
-  output_max_.setEmpty();
-}
-
-MouseInputFilter::~MouseInputFilter() {
-}
-
-void MouseInputFilter::InjectKeyEvent(const protocol::KeyEvent& event) {
-  input_stub_->InjectKeyEvent(event);
-}
-
-void MouseInputFilter::InjectMouseEvent(const protocol::MouseEvent& event) {
-  if (input_max_.isEmpty() || output_max_.isEmpty())
-    return;
-
-  // We scale based on the maximum input & output coordinates, rather than the
-  // input and output sizes, so that it's possible to reach the edge of the
-  // output when up-scaling.  We also take care to round up or down correctly,
-  // which is important when down-scaling.
-  protocol::MouseEvent out_event(event);
-  if (out_event.has_x()) {
-    int x = out_event.x() * output_max_.width();
-    x = (x + input_max_.width() / 2) / input_max_.width();
-    out_event.set_x(std::max(0, std::min(output_max_.width(), x)));
-  }
-  if (out_event.has_y()) {
-    int y = out_event.y() * output_max_.height();
-    y = (y + input_max_.height() / 2) / input_max_.height();
-    out_event.set_y(std::max(0, std::min(output_max_.height(), y)));
-  }
-
-  input_stub_->InjectMouseEvent(out_event);
-}
-
-void MouseInputFilter::set_input_size(const SkISize& size) {
-  input_max_ = SkISize::Make(size.width() - 1, size.height() - 1);
-}
-
-void MouseInputFilter::set_output_size(const SkISize& size) {
-  output_max_ = SkISize::Make(size.width() - 1, size.height() - 1);
-}
-
-}  // namespace remoting