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Add "inject touch" control message

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Add a control message type in the protocol to forward touch events to
the device.
This commit is contained in:
Romain Vimont
2019-09-15 16:16:17 +02:00
parent d90549d1e6
commit 77f876e29c
6 changed files with 140 additions and 7 deletions
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19
app/src/control_msg.c
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@ -1,6 +1,7 @@
#include "control_msg.h"
#include <string.h>
#include <SDL2/SDL_assert.h>
#include "config.h"
#include "buffer_util.h"
@ -24,6 +25,16 @@ write_string(const char *utf8, size_t max_len, unsigned char *buf) {
return 2 + len;
}
static uint16_t
to_fixed_point_16(float f) {
SDL_assert(f >= 0.0f && f <= 1.0f);
uint32_t u = f * 0x1p16f; // 2^16
if (u >= 0xffff) {
u = 0xffff;
}
return (uint16_t) u;
}
size_t
control_msg_serialize(const struct control_msg *msg, unsigned char *buf) {
buf[0] = msg->type;
@ -43,6 +54,14 @@ control_msg_serialize(const struct control_msg *msg, unsigned char *buf) {
buffer_write32be(&buf[2], msg->inject_mouse_event.buttons);
write_position(&buf[6], &msg->inject_mouse_event.position);
return 18;
case CONTROL_MSG_TYPE_INJECT_TOUCH_EVENT:
buf[1] = msg->inject_touch_event.action;
buffer_write64be(&buf[2], msg->inject_touch_event.pointer_id);
write_position(&buf[10], &msg->inject_touch_event.position);
uint16_t pressure =
to_fixed_point_16(msg->inject_touch_event.pressure);
buffer_write16be(&buf[22], pressure);
return 24;
case CONTROL_MSG_TYPE_INJECT_SCROLL_EVENT:
write_position(&buf[1], &msg->inject_scroll_event.position);
buffer_write32be(&buf[13],