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1 // Copyright (c) 2015 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/client/plugin/touch_input_scaler.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "remoting/proto/event.pb.h" | |
9 | |
10 namespace remoting { | |
11 | |
12 using protocol::TouchEvent; | |
13 using protocol::TouchEventPoint; | |
14 | |
15 namespace { | |
16 | |
17 // |value| is the number to be scaled and clamped. |output_max| is the output | |
18 // desktop's max height or width. |input_max| is the input desktop's max height | |
19 // or width. | |
20 float ScaleAndClamp(float value, int output_max, int input_max) { | |
21 value *= output_max; | |
22 value /= input_max; | |
Sergey Ulanov
2015/01/29 18:00:46
handle the case when input_max == 0.
Rintaro Kuroiwa
2015/01/30 17:57:01
is_empty() check as line 36 should handle that. I'
| |
23 return std::max(0.0f, std::min(static_cast<float>(output_max), value)); | |
24 } | |
25 | |
26 } // namespace | |
27 | |
28 TouchInputScaler::TouchInputScaler(InputStub* input_stub) | |
29 : InputFilter(input_stub) { | |
30 } | |
31 | |
32 TouchInputScaler::~TouchInputScaler() { | |
33 } | |
34 | |
35 void TouchInputScaler::InjectTouchEvent(const TouchEvent& event) { | |
36 if (input_size_.is_empty() || output_size_.is_empty()) | |
37 return; | |
38 | |
39 // We scale based on the maximum input & output coordinates, rather than the | |
40 // input and output sizes, so that it's possible to reach the edge of the | |
41 // output when up-scaling. We also take care to round up or down correctly, | |
42 // which is important when down-scaling. | |
43 TouchEvent out_event(event); | |
44 for (int i = 0; i < out_event.touch_points().size(); ++i) { | |
45 TouchEventPoint* point = out_event.mutable_touch_points(i); | |
46 if (point->has_x() || point->has_y()) { | |
47 DCHECK(point->has_x() && point->has_y()); | |
48 point->set_x( | |
49 ScaleAndClamp(point->x(), output_size_.width(), input_size_.width())); | |
50 point->set_y(ScaleAndClamp(point->y(), | |
51 output_size_.height(), | |
52 input_size_.height())); | |
53 } | |
54 } | |
55 | |
56 InputFilter::InjectTouchEvent(out_event); | |
57 } | |
58 | |
59 } // namespace remoting | |
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