Replace the compilation flag SKIP_FRAMES by a runtime flag to force
rendering of expired frames. By default, the expired frames are skipped.

Prepare indentation for --render-expired-frames.

In addition to the shortcut (Ctrl+o) to turn the device screen off, add
a command-line argument to turn it off on start.

Preparse indentation for --turn-screen-off.

If --no-control is disabled, there is no need for a controller.

It also avoids to power on the device on start if control is disabled.

Starting the server requires more and more parameters. For clarity,
group them in a struct.

For clarity, store the flag resulting of the command-line options
--no-control and --no-display into "control" and "display".

The flag is used only in the server_start() implementation, there is no
need to store it in the structure.

Only keep "turn device screen off" and POWER button.

After we turn the device screen off (with Ctrl+o), turning it back on
does not always work, and leaves the device in a weird state, where even
the power button may not be sufficient:
<https://github.com/Genymobile/scrcpy/issues/175#issuecomment-497946596>

This is not an acceptable behavior, so disable the shortcut to turn the
physical device screen on. We can use the POWER button (or Ctrl+p)
instead.

This will reduce confusion between "power on" when the device is off and
"turn device screen off" while mirroring.

The condition "event->type == SDL_KEYDOWN" and the variable
input_manager->controller are used many times. Replace them by local
variables to reduce verbosity.

So that it also works on Windows.

Introduced by the previous commit.

Add two shortcuts:
 - Ctrl+o to turn the device screen off while mirroring
 - Ctrl+Shift+o to turn it back on

On power on (either via the POWER key or BACK while screen is off), both
the device screen and the mirror are turned on.

<https://github.com/Genymobile/scrcpy/issues/175>

For consistency.

Signed-off-by: NYu-Chen Lin <npes87184@gmail.com>
Signed-off-by: NRomain Vimont <rom@rom1v.com>

Use the same variable name in functions declaration and definition.
Signed-off-by: NYu-Chen Lin <npes87184@gmail.com>
Signed-off-by: NRomain Vimont <rom@rom1v.com>

Synchronizing local and device clipboards in invisible. Add INFO logs
on success.

The default behavior seems annoying.

Fixes <https://github.com/Genymobile/scrcpy/issues/554>

Sometimes, it is not obvious whether a log is generated by the server or
by the client. Prefix server logs for clarity.

After the recent refactorings, a "control event" is not necessarily an
"event" (it may be a "command"). Similarly, the unique "device event"
used to send the device clipboard content is more a "reponse" to the
request from the client than an "event".

Rename both to "message", and rename the message types to better
describe their intent.

Correct return value type in handle_event

handle_event return the type enum event_result not bool
Signed-off-by: NYu-Chen Lin <npes87184@gmail.com>

This will fix build warning in newer meson.
Fix #540.
Signed-off-by: NYu-Chen Lin <npes87184@gmail.com>

It was already possible to _paste_ (with Ctrl+v) the content of the
computer clipboard on the device. Technically, it injects a sequence of
events to generate the text.

Add a new feature (Ctrl+Shift+v) to copy to the device clipboard
instead, without injecting the content. Contrary to events injection,
this preserves the UTF-8 content exactly, so the text is not broken by
special characters.

<https://github.com/Genymobile/scrcpy/issues/413>

Parsing a String from a serialized control event, encoded as length (2
bytes) + data, will be necessary in several events.

Extract it to a separate method.

At least 2 bytes must be available to read the length of the String.

On Ctrl+C:
 - the client sends a GET_CLIPBOARD command to the device;
 - the device retrieve its current clipboard text and sends it in a
   GET_CLIPBOARD device event;
 - the client sets this text as the system clipboard text, so that it
   can be pasted in another application.

Fixes <https://github.com/Genymobile/scrcpy/issues/145>

Create a separate component to send device events, managed by the
controller.

Create a separate component to handle device events, managed by the
controller.

Add the first device event, used to forward the device clipboard to the
computer.

The socket used the device-to-computer direction to stream the video and
the computer-to-device direction to send control events.

Some features, like copy-paste from device to computer, require to send
non-video data from the device to the computer.

To make them possible, use two sockets:
 - one for streaming the video from the device to the client;
 - one for control/events in both directions.

A string is serialized as a length (2 bytes) followed by the string data
(non nul-terminated).

For now, it is used only once, but we will need to serialize strings in
other events.

This will avoid to produce invalid UTF-8 results (although unlikely).

This will help to avoid truncating a UTF-8 string in the middle of a
code point, producing an invalid UTF-8 result.

Add missing tests for serialization and deserialization of control
events.

The framework class android.graphics.Point cannot be used in unit tests.
Implement our own Point.