Fix destruction of pool buffers

main.c

@@ -1,5 +1,7 @@
 #define _POSIX_C_SOURCE 200809L
 
+#include <string.h>
+
 #include "menu.h"
 #include "wayland.h"
 
@@ -20,5 +22,7 @@ int main(int argc, char *argv[]) {
 	if (!menu->passwd) {
 		read_items(menu);
 	}
-	return menu_run(menu);
+	int status = menu_run(menu);
+	menu_destroy(menu);
+	return status;
 }

menu.c

@@ -320,10 +320,12 @@ static void match_items(struct menu *menu) {
 	}
 }
 
-// Process menu items.
-void menu_process_items(struct menu *menu) {
+// Render menu items.
+void menu_render_items(struct menu *menu) {
+	render_menu(menu);
 	calc_widths(menu);
 	match_items(menu);
+	render_menu(menu);
 }
 
 static void insert(struct menu *menu, const char *text, ssize_t len) {
@@ -659,7 +661,5 @@ static void free_items(struct menu *menu) {
 void menu_destroy(struct menu *menu) {
 	free_pages(menu);
 	free_items(menu);
-
-	destroy_buffer(&menu->buffers[0]);
-	destroy_buffer(&menu->buffers[1]);
+	free(menu);
 }

menu.h

@@ -1,9 +1,10 @@
 #ifndef WMENU_MENU_H
 #define WMENU_MENU_H
 
+#include <stdbool.h>
+#include <sys/types.h>
 #include <xkbcommon/xkbcommon.h>
-
-#include "pool-buffer.h"
+#include <wayland-client.h>
 
 // A menu item.
 struct item {
@@ -48,9 +49,6 @@ struct menu {
 
 	struct wl_context *context;
 
-	struct pool_buffer buffers[2];
-	struct pool_buffer *current;
-
 	int width;
 	int height;
 	int line_height;
@@ -77,7 +75,7 @@ struct menu {
 struct menu *menu_create();
 void menu_getopts(struct menu *menu, int argc, char *argv[]);
 void menu_add_item(struct menu *menu, char *text);
-void menu_process_items(struct menu *menu);
+void menu_render_items(struct menu *menu);
 void menu_paste(struct menu *menu, const char *text, ssize_t len);
 void menu_keypress(struct menu *menu, enum wl_keyboard_key_state key_state,
 		xkb_keysym_t sym);

render.c

@@ -7,11 +7,14 @@
 
 #include "menu.h"
 #include "pango.h"
+#include "pool-buffer.h"
 #include "wayland.h"
 
 // Calculate text widths.
 void calc_widths(struct menu *menu) {
-	cairo_t *cairo = menu->current->cairo;
+	struct wl_context *context = menu->context;
+	struct pool_buffer *current = context_get_current_buffer(context);
+	cairo_t *cairo = current->cairo;
 
 	// Calculate prompt width
 	if (menu->prompt) {
@@ -195,13 +198,12 @@ void render_menu(struct menu *menu) {
 	render_to_cairo(menu, cairo);
 
 	int scale = context_get_scale(context);
-	menu->current = get_next_buffer(context_get_shm(context),
-		menu->buffers, menu->width, menu->height, scale);
-	if (!menu->current) {
+	struct pool_buffer *buffer = context_get_next_buffer(context, scale);
+	if (!buffer) {
 		goto cleanup;
 	}
 
-	cairo_t *shm = menu->current->cairo;
+	cairo_t *shm = buffer->cairo;
 	cairo_save(shm);
 	cairo_set_operator(shm, CAIRO_OPERATOR_CLEAR);
 	cairo_paint(shm);
@@ -211,7 +213,7 @@ void render_menu(struct menu *menu) {
 
 	struct wl_surface *surface = context_get_surface(context);
 	wl_surface_set_buffer_scale(surface, scale);
-	wl_surface_attach(surface, menu->current->buffer, 0, 0);
+	wl_surface_attach(surface, buffer->buffer, 0, 0);
 	wl_surface_damage(surface, 0, 0, menu->width, menu->height);
 	wl_surface_commit(surface);
 

wayland.c

@@ -17,7 +17,7 @@
 #include <xkbcommon/xkbcommon.h>
 
 #include "menu.h"
-#include "render.h"
+#include "pool-buffer.h"
 #include "wayland.h"
 #include "xdg-activation-v1-client-protocol.h"
 #include "wlr-layer-shell-unstable-v1-client-protocol.h"
@@ -96,6 +96,9 @@ struct wl_context {
 	struct zwlr_layer_surface_v1 *layer_surface;
 	struct wl_data_offer *data_offer;
 	struct output *output;
+
+	struct pool_buffer buffers[2];
+	struct pool_buffer *current;
 };
 
 // Returns the current output_scale.
@@ -103,9 +106,16 @@ int context_get_scale(struct wl_context *context) {
 	return context->output ? context->output->scale : 1;
 }
 
-// Returns the shared memory for the context.
-struct wl_shm *context_get_shm(struct wl_context *context) {
-	return context->shm;
+// Returns the current buffer from the pool.
+struct pool_buffer *context_get_current_buffer(struct wl_context *context) {
+	return context->current;
+}
+
+// Returns the next buffer from the pool.
+struct pool_buffer *context_get_next_buffer(struct wl_context *context, int scale) {
+	struct menu *menu = context->menu;
+	context->current = get_next_buffer(context->shm, context->buffers, menu->width, menu->height, scale);
+	return context->current;
 }
 
 // Returns the Wayland surface for the context.
@@ -446,9 +456,7 @@ int menu_run(struct menu *menu) {
 
 	wl_surface_commit(context->surface);
 	wl_display_roundtrip(context->display);
-	render_menu(menu);
-	menu_process_items(menu);
-	render_menu(menu);
+	menu_render_items(menu);
 
 	struct pollfd fds[] = {
 		{ wl_display_get_fd(context->display), POLLIN },
@@ -482,8 +490,8 @@ int menu_run(struct menu *menu) {
 	}
 
 	bool failure = menu->failure;
-	menu_destroy(menu);
 	context_destroy(context);
+	menu->context = NULL;
 
 	if (failure) {
 		return EXIT_FAILURE;

wayland.h

@@ -9,7 +9,8 @@ struct wl_context;
 int menu_run(struct menu *menu);
 
 int context_get_scale(struct wl_context *context);
-struct wl_shm *context_get_shm(struct wl_context *context);
+struct pool_buffer *context_get_current_buffer(struct wl_context *context);
+struct pool_buffer *context_get_next_buffer(struct wl_context *context, int scale);
 struct wl_surface *context_get_surface(struct wl_context *context);
 struct xkb_state *context_get_xkb_state(struct wl_context *context);
 bool context_paste(struct wl_context *context);