scrcpy/app/src/controlevent.c

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C
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#include "controlevent.h"
#include <SDL2/SDL_stdinc.h>
#include "lockutil.h"
#include "log.h"
static inline void write16(Uint8 *buf, Uint16 value) {
buf[0] = value >> 8;
buf[1] = value;
}
static inline void write32(Uint8 *buf, Uint32 value) {
buf[0] = value >> 24;
buf[1] = value >> 16;
buf[2] = value >> 8;
buf[3] = value;
}
static void write_position(Uint8 *buf, const struct position *position) {
write16(&buf[0], position->point.x);
write16(&buf[2], position->point.y);
write16(&buf[4], position->screen_size.width);
write16(&buf[6], position->screen_size.height);
}
int control_event_serialize(const struct control_event *event, unsigned char *buf) {
buf[0] = event->type;
switch (event->type) {
case CONTROL_EVENT_TYPE_KEYCODE:
buf[1] = event->keycode_event.action;
write32(&buf[2], event->keycode_event.keycode);
write32(&buf[6], event->keycode_event.metastate);
return 10;
case CONTROL_EVENT_TYPE_TEXT: {
// write length (1 byte) + date (non nul-terminated)
size_t len = strlen(event->text_event.text);
if (len > TEXT_MAX_LENGTH) {
// injecting a text takes time, so limit the text length
len = TEXT_MAX_LENGTH;
}
buf[1] = (Uint8) len;
memcpy(&buf[2], event->text_event.text, len);
return 2 + len;
}
case CONTROL_EVENT_TYPE_MOUSE:
buf[1] = event->mouse_event.action;
write32(&buf[2], event->mouse_event.buttons);
write_position(&buf[6], &event->mouse_event.position);
return 14;
case CONTROL_EVENT_TYPE_SCROLL:
write_position(&buf[1], &event->scroll_event.position);
write32(&buf[9], (Uint32) event->scroll_event.hscroll);
write32(&buf[13], (Uint32) event->scroll_event.vscroll);
return 17;
case CONTROL_EVENT_TYPE_COMMAND:
buf[1] = event->command_event.action;
return 2;
default:
LOGW("Unknown event type: %u", (unsigned) event->type);
return 0;
}
}
void control_event_destroy(struct control_event *event) {
if (event->type == CONTROL_EVENT_TYPE_TEXT) {
SDL_free(event->text_event.text);
}
}
SDL_bool control_event_queue_is_empty(const struct control_event_queue *queue) {
return queue->head == queue->tail;
}
SDL_bool control_event_queue_is_full(const struct control_event_queue *queue) {
return (queue->head + 1) % CONTROL_EVENT_QUEUE_SIZE == queue->tail;
}
SDL_bool control_event_queue_init(struct control_event_queue *queue) {
queue->head = 0;
queue->tail = 0;
// the current implementation may not fail
return SDL_TRUE;
}
void control_event_queue_destroy(struct control_event_queue *queue) {
int i = queue->tail;
while (i != queue->head) {
control_event_destroy(&queue->data[i]);
i = (i + 1) % CONTROL_EVENT_QUEUE_SIZE;
}
}
SDL_bool control_event_queue_push(struct control_event_queue *queue, const struct control_event *event) {
if (control_event_queue_is_full(queue)) {
return SDL_FALSE;
}
queue->data[queue->head] = *event;
queue->head = (queue->head + 1) % CONTROL_EVENT_QUEUE_SIZE;
return SDL_TRUE;
}
SDL_bool control_event_queue_take(struct control_event_queue *queue, struct control_event *event) {
if (control_event_queue_is_empty(queue)) {
return SDL_FALSE;
}
*event = queue->data[queue->tail];
queue->tail = (queue->tail + 1) % CONTROL_EVENT_QUEUE_SIZE;
return SDL_TRUE;
}