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i3bar: count references to blocks

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This prevents blocks from being destroyed before their hotspots are destroyed,
in case it is used for a pending click event that fires between the bar
receiving a new status, which destroys the block, and the bar rendering the new
status, which destroys the hotspot; this problem can be easily produced by
scrolling on a block that immediately causes a new status to be sent, with
multiple outputs
This commit is contained in:
Ian Fan 2018-09-12 08:28:28 +01:00
parent af9e8f94cc
commit 2eaef80206
4 changed files with 19 additions and 6 deletions
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3
include/swaybar/status_line.h
View file

@ -36,6 +36,7 @@ struct i3bar_protocol_state {
struct i3bar_block {
struct wl_list link;
int ref_count;
char *full_text, *short_text, *align;
bool urgent;
uint32_t *color;
@ -73,7 +74,7 @@ void status_line_free(struct status_line *status);
bool i3bar_handle_readable(struct status_line *status);
enum hotspot_event_handling i3bar_block_send_click(struct status_line *status,
struct i3bar_block *block, int x, int y, enum x11_button button);
void i3bar_block_free(struct i3bar_block *block);
void i3bar_block_unref(struct i3bar_block *block);
enum x11_button wl_button_to_x11_button(uint32_t button);
enum x11_button wl_axis_to_x11_button(uint32_t axis, wl_fixed_t value);

13
swaybar/i3bar.c
View file

@ -8,11 +8,10 @@
#include "swaybar/config.h"
#include "swaybar/status_line.h"
void i3bar_block_free(struct i3bar_block *block) {
static void i3bar_block_free(struct i3bar_block *block) {
if (!block) {
return;
}
wl_list_remove(&block->link);
free(block->full_text);
free(block->short_text);
free(block->align);
@ -22,10 +21,17 @@ void i3bar_block_free(struct i3bar_block *block) {
free(block);
}
void i3bar_block_unref(struct i3bar_block *block) {
if (--block->ref_count == 0) {
i3bar_block_free(block);
}
}
static bool i3bar_parse_json(struct status_line *status, const char *text) {
struct i3bar_block *block, *tmp;
wl_list_for_each_safe(block, tmp, &status->blocks, link) {
i3bar_block_free(block);
wl_list_remove(&block->link);
i3bar_block_unref(block);
}
json_object *results = json_tokener_parse(text);
if (!results) {
@ -61,6 +67,7 @@ static bool i3bar_parse_json(struct status_line *status, const char *text) {
json_object_object_get_ex(json, "border_right", &border_right);
struct i3bar_block *block = calloc(1, sizeof(struct i3bar_block));
block->ref_count = 1;
block->full_text = full_text ?
strdup(json_object_get_string(full_text)) : NULL;
block->short_text = short_text ?

7
swaybar/render.c
View file

@ -115,6 +115,10 @@ static enum hotspot_event_handling block_hotspot_callback(struct swaybar_output
return i3bar_block_send_click(status, block, x, y, button);
}
static void i3bar_block_unref_callback(void *data) {
i3bar_block_unref(data);
}
static uint32_t render_status_block(cairo_t *cairo,
struct swaybar_config *config, struct swaybar_output *output,
struct i3bar_block *block, double *x,
@ -179,8 +183,9 @@ static uint32_t render_status_block(cairo_t *cairo,
hotspot->width = width;
hotspot->height = height;
hotspot->callback = block_hotspot_callback;
hotspot->destroy = NULL;
hotspot->destroy = i3bar_block_unref_callback;
hotspot->data = block;
block->ref_count++;
wl_list_insert(&output->hotspots, &hotspot->link);
double pos = *x;

2
swaybar/status_line.c
View file

@ -130,7 +130,7 @@ void status_line_free(struct status_line *status) {
case PROTOCOL_I3BAR:;
struct i3bar_block *block, *tmp;
wl_list_for_each_safe(block, tmp, &status->blocks, link) {
i3bar_block_free(block);
i3bar_block_unref(block);
}
free(status->i3bar_state.buffer);
break;