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Fix crash when long window titles are used

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cairo_image_surface_create() return CAIRO_STATUS_INVALID_SIZE on too
long window titles and creates then no surface. Therefore it makes
sense to limit the window title length to a reasonable length.

Fix: https://github.com/swaywm/sway/issues/6531

Signed-off-by: Felix Weilbach <felix.weilbach@t-online.de>
This commit is contained in:
Felix Weilbach 2021-09-26 13:41:50 +02:00
parent 02b412a3d4
commit a2763262d4
3 changed files with 38 additions and 2 deletions
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30
common/pango.c
View file

@ -152,3 +152,33 @@ void render_text(cairo_t *cairo, const char *font,
g_object_unref(layout);
free(buf);
}
void render_text_ellipsize(cairo_t *cairo, const char *font, double scale,
bool markup, double width, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
// Add one since vsnprintf excludes null terminator.
int length = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
char *buf = malloc(length);
if (buf == NULL) {
sway_log(SWAY_ERROR, "Failed to allocate memory");
return;
}
va_start(args, fmt);
vsnprintf(buf, length, fmt, args);
va_end(args);
PangoLayout *layout = get_pango_layout(cairo, font, buf, scale, markup);
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
pango_layout_set_width(layout, width * PANGO_SCALE);
cairo_font_options_t *fo = cairo_font_options_create();
cairo_get_font_options(cairo, fo);
pango_cairo_context_set_font_options(pango_layout_get_context(layout), fo);
cairo_font_options_destroy(fo);
pango_cairo_update_layout(cairo, layout);
pango_cairo_show_layout(cairo, layout);
g_object_unref(layout);
free(buf);
}

2
include/pango.h
View file

@ -20,5 +20,7 @@ void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
void get_text_metrics(const char *font, int *height, int *baseline);
void render_text(cairo_t *cairo, const char *font,
double scale, bool markup, const char *fmt, ...);
void render_text_ellipsize(cairo_t *cairo, const char *font, double scale,
bool markup, double width, const char *fmt, ...);
#endif

8
sway/tree/container.c
View file

@ -517,6 +517,8 @@ static void render_titlebar_text_texture(struct sway_output *output,
cairo_set_font_options(c, fo);
get_text_size(c, config->font, &width, NULL, &baseline, scale,
config->pango_markup, "%s", text);
int max_width = con->current.width - 2 * config->titlebar_h_padding;
width = width > max_width ? max_width : width;
cairo_surface_destroy(dummy_surface);
cairo_destroy(c);
@ -529,7 +531,7 @@ static void render_titlebar_text_texture(struct sway_output *output,
}
cairo_surface_t *surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32, width, height);
CAIRO_FORMAT_ARGB32, width, height);
cairo_t *cairo = cairo_create(surface);
cairo_set_antialias(cairo, CAIRO_ANTIALIAS_BEST);
cairo_set_font_options(cairo, fo);
@ -542,7 +544,8 @@ static void render_titlebar_text_texture(struct sway_output *output,
class->text[2], class->text[3]);
cairo_move_to(cairo, 0, config->font_baseline * scale - baseline);
render_text(cairo, config->font, scale, pango_markup, "%s", text);
render_text_ellipsize(cairo, config->font, scale, pango_markup, width, "%s",
text);
cairo_surface_flush(surface);
unsigned char *data = cairo_image_surface_get_data(surface);
@ -799,6 +802,7 @@ void container_set_resizing(struct sway_container *con, bool resizing) {
return;
}
container_update_title_textures(con);
if (con->view) {
if (con->view->impl->set_resizing) {
con->view->impl->set_resizing(con->view, resizing);