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Implement async clipboard support for Wayland

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This uses GIOChannels and the Glib event loop to read the file descriptor
in an asynchronous fashion.
This commit is contained in:
Quantum 2021-09-30 04:45:33 -04:00 committed by lbonn
parent 42039e34db
commit 06da4cf24c
1 changed files with 83 additions and 38 deletions
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121
source/wayland/display.c
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@ -725,32 +725,75 @@ static void wayland_keyboard_release(wayland_seat *self) {
self->keyboard = NULL;
}
static char *clipboard_read_data(int fds[2]) {
size_t read_bs = 1024;
char *new_clipboard_data = g_malloc(read_bs);
if (new_clipboard_data == NULL) {
close(fds[0]);
return NULL;
}
size_t k = 0;
#define CLIPBOARD_READ_INCREMENT 1024
// TODO: do this outside of the wayland loop
while (1) {
ssize_t n = read(fds[0], new_clipboard_data + k, read_bs);
if (n <= 0) {
new_clipboard_data[k] = '\0';
break;
}
k += n;
new_clipboard_data = g_realloc(new_clipboard_data, k + read_bs);
if (new_clipboard_data == NULL) {
close(fds[0]);
return NULL;
}
}
close(fds[0]);
typedef void (*clipboard_read_callback)(char *data);
return new_clipboard_data;
struct clipboard_read_info {
char *buffer;
size_t size;
int fd;
clipboard_read_callback callback;
};
static gboolean clipboard_read_glib_callback(GIOChannel *channel, GIOCondition condition, gpointer opaque) {
struct clipboard_read_info *info = opaque;
gsize read;
switch (g_io_channel_read_chars(channel, info->buffer + info->size, CLIPBOARD_READ_INCREMENT, &read, NULL)) {
case G_IO_STATUS_AGAIN:
return TRUE;
case G_IO_STATUS_NORMAL: {
info->size += read;
info->buffer = g_realloc(info->buffer, info->size + CLIPBOARD_READ_INCREMENT);
if (!info->buffer) {
g_io_channel_shutdown(channel, FALSE, NULL);
g_io_channel_unref(channel);
close(info->fd);
g_free(info);
return FALSE;
}
return TRUE;
}
default:
info->buffer[info->size] = '\0';
info->callback(info->buffer);
g_io_channel_shutdown(channel, FALSE, NULL);
g_io_channel_unref(channel);
close(info->fd);
g_free(info);
return FALSE;
}
}
static gboolean clipboard_read_data(int fd, clipboard_read_callback callback) {
GIOChannel *channel = g_io_channel_unix_new(fd);
struct clipboard_read_info *info = g_malloc(sizeof *info);
if (info == NULL) {
g_io_channel_unref(channel);
close(fd);
return FALSE;
}
info->fd = fd;
info->size = 0;
info->callback = callback;
info->buffer = g_malloc(CLIPBOARD_READ_INCREMENT);
if (info->buffer == NULL) {
g_io_channel_unref(channel);
close(info->fd);
g_free(info);
return FALSE;
}
g_io_add_watch(channel, G_IO_IN | G_IO_HUP | G_IO_ERR,
clipboard_read_glib_callback, info);
return TRUE;
}
static void data_offer_handle_offer(void *data, struct wl_data_offer *offer,
@ -766,6 +809,13 @@ static void data_device_handle_data_offer(void *data,
wl_data_offer_add_listener(offer, &data_offer_listener, NULL);
}
static void clipboard_default_callback(char *data) {
if (wayland->clipboard_default_data != NULL) {
g_free(wayland->clipboard_default_data);
}
wayland->clipboard_default_data = data;
}
static void data_device_handle_selection(void *data,
struct wl_data_device *data_device,
struct wl_data_offer *offer) {
@ -783,13 +833,7 @@ static void data_device_handle_selection(void *data,
wl_display_roundtrip(wayland->display);
char *new_clipboard_data = clipboard_read_data(fds);
if (wayland->clipboard_default_data != NULL) {
g_free(wayland->clipboard_default_data);
}
wayland->clipboard_default_data = new_clipboard_data;
clipboard_read_data(fds[0], clipboard_default_callback);
wl_data_offer_destroy(offer);
}
@ -815,6 +859,13 @@ static void primary_selection_device_handle_data_offer(
offer, &primary_selection_offer_listener, NULL);
}
static void clipboard_primary_callback(char *data) {
if (wayland->clipboard_primary_data != NULL) {
g_free(wayland->clipboard_primary_data);
}
wayland->clipboard_primary_data = data;
}
static void primary_selection_device_handle_selection(
void *data, struct zwp_primary_selection_device_v1 *data_device,
struct zwp_primary_selection_offer_v1 *offer) {
@ -832,13 +883,7 @@ static void primary_selection_device_handle_selection(
wl_display_roundtrip(wayland->display);
char *new_clipboard_data = clipboard_read_data(fds);
if (wayland->clipboard_primary_data != NULL) {
g_free(wayland->clipboard_primary_data);
}
wayland->clipboard_primary_data = new_clipboard_data;
clipboard_read_data(fds[0], clipboard_primary_callback);
zwp_primary_selection_offer_v1_destroy(offer);
}