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rendernode: Limit diff region

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Limit the diff region to 30 rectangles (randomly chosen because it
looked big enough to not trigger by accident and small enough to not
cause performance issues).

If the diff region gets more complicated, we abort to the parent node
and use its bounds as the diff region instead and then continue diffing
the rest of the node tree.

Fixes: #4560
Fixes: #2396
This commit is contained in:
Benjamin Otte 2021-12-20 18:40:02 +01:00
parent 4e6ee28bcb
commit 20dcc31d19
1 changed files with 10 additions and 0 deletions
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10
gsk/gskrendernodeimpl.c
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@ -33,6 +33,12 @@
#include <hb-ot.h>
/* maximal number of rectangles we keep in a diff region before we throw
* the towel and just use the bounding box of the parent node.
* Meant to avoid performance corner cases.
*/
#define MAX_RECTS_IN_DIFF 30
static inline void
gsk_cairo_rectangle (cairo_t *cr,
const graphene_rect_t *rect)
@ -2611,6 +2617,8 @@ static GskDiffResult
gsk_container_node_keep_func (gconstpointer elem1, gconstpointer elem2, gpointer data)
{
gsk_render_node_diff ((GskRenderNode *) elem1, (GskRenderNode *) elem2, data);
if (cairo_region_num_rectangles (data) > MAX_RECTS_IN_DIFF)
return GSK_DIFF_ABORTED;
return GSK_DIFF_OK;
}
@ -2624,6 +2632,8 @@ gsk_container_node_change_func (gconstpointer elem, gsize idx, gpointer data)
rectangle_init_from_graphene (&rect, &node->bounds);
cairo_region_union_rectangle (region, &rect);
if (cairo_region_num_rectangles (region) > MAX_RECTS_IN_DIFF)
return GSK_DIFF_ABORTED;
return GSK_DIFF_OK;
}