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Box Conversion: Cancel conversion during html_destroy

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If dom_to_box is still in progress when we destroy an HTML
content, we need to cancel the conversion otherwise we will
end up with a scheduled callback into infinity.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
This commit is contained in:
Daniel Silverstone 2019-08-23 21:58:07 +01:00
parent cb33f696a2
commit 524965b867
4 changed files with 38 additions and 3 deletions
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3
content/handlers/html/box.h
View File

@ -359,7 +359,8 @@ bool box_vscrollbar_present(const struct box *box);
bool box_hscrollbar_present(const struct box *box);
nserror dom_to_box(struct dom_node *n, struct html_content *c,
box_construct_complete_cb cb);
box_construct_complete_cb cb, void **box_conversion_context);
nserror cancel_dom_to_box(void *box_conversion_context);
bool box_normalise_block(
struct box *block,

23
content/handlers/html/box_construct.c
View File

@ -163,10 +163,12 @@ static const struct element_entry element_table[] = {
* \return netsurf error code indicating status of call
*/
nserror dom_to_box(dom_node *n, html_content *c, box_construct_complete_cb cb)
nserror dom_to_box(dom_node *n, html_content *c, box_construct_complete_cb cb, void **box_conversion_context)
{
struct box_construct_ctx *ctx;
assert(box_conversion_context != NULL);
if (c->bctx == NULL) {
/* create a context allocation for this box tree */
c->bctx = talloc_zero(0, int);
@ -186,9 +188,28 @@ nserror dom_to_box(dom_node *n, html_content *c, box_construct_complete_cb cb)
ctx->cb = cb;
ctx->bctx = c->bctx;
*box_conversion_context = ctx;
return guit->misc->schedule(0, (void *)convert_xml_to_box, ctx);
}
nserror cancel_dom_to_box(void *box_conversion_context)
{
struct box_construct_ctx *ctx = box_conversion_context;
nserror err;
err = guit->misc->schedule(-1, (void *)convert_xml_to_box, ctx);
if (err != NSERROR_OK) {
return err;
}
dom_node_unref(ctx->n);
free(ctx);
return NSERROR_OK;
}
/* mapping from CSS display to box type
* this table must be in sync with libcss' css_display enum */
static const box_type box_map[] = {

11
content/handlers/html/html.c
View File

@ -115,6 +115,8 @@ static void html_box_convert_done(html_content *c, bool success)
NSLOG(netsurf, INFO, "Done XML to box (%p)", c);
c->box_conversion_context = NULL;
/* Clean up and report error if unsuccessful or aborted */
if ((success == false) || (c->aborted)) {
html_object_free_objects(c);
@ -656,7 +658,7 @@ void html_finish_conversion(html_content *htmlc)
html_get_dimensions(htmlc);
error = dom_to_box(html, htmlc, html_box_convert_done);
error = dom_to_box(html, htmlc, html_box_convert_done, &htmlc->box_conversion_context);
if (error != NSERROR_OK) {
NSLOG(netsurf, INFO, "box conversion failed");
dom_node_unref(html);
@ -1710,6 +1712,13 @@ static void html_destroy(struct content *c)
NSLOG(netsurf, INFO, "content %p", c);
/* If we're still converting a layout, cancel it */
if (html->box_conversion_context != NULL) {
if (cancel_dom_to_box(html->box_conversion_context) != NSERROR_OK) {
NSLOG(netsurf, CRITICAL, "WARNING, Unable to cancel conversion context, browser may crash");
}
}
/* Destroy forms */
for (f = html->forms; f != NULL; f = g) {
g = f->prev;

4
content/handlers/html/html_internal.h
View File

@ -138,6 +138,10 @@ typedef struct html_content {
/** A talloc context purely for the render box tree */
int *bctx;
/** A context pointer for the box conversion, NULL if no conversion
* is in progress.
*/
void *box_conversion_context;
/** Box tree, or NULL. */
struct box *layout;
/** Document background colour. */