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window-actor: Use MetaRegionBuilder when scanning the visible region

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This gives a pretty solid performance improvement when resizing windows.
This commit is contained in:
Jasper St. Pierre
2012-04-29 07:10:15 -04:00
parent 60c05a0dac
commit ac18f41ed1
3 changed files with 45 additions and 31 deletions
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27
src/compositor/region-utils.c
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@@ -43,34 +43,17 @@
/* Optimium performance seems to be with MAX_CHUNK_RECTANGLES=4; 8 is about 10% slower.
* But using 8 may be more robust to systems with slow malloc(). */
#define MAX_CHUNK_RECTANGLES 8
#define MAX_LEVELS 16
typedef struct
{
/* To merge regions in binary tree order, we need to keep track of
* the regions that we've already merged together at different
* levels of the tree. We fill in an array in the pattern:
*
* |a |
* |b |a |
* |c | |ab |
* |d |c |ab |
* |e | | |abcd|
*/
cairo_region_t *levels[MAX_LEVELS];
int n_levels;
} MetaRegionBuilder;
static void
void
meta_region_builder_init (MetaRegionBuilder *builder)
{
int i;
for (i = 0; i < MAX_LEVELS; i++)
for (i = 0; i < META_REGION_BUILDER_MAX_LEVELS; i++)
builder->levels[i] = NULL;
builder->n_levels = 1;
}
static void
void
meta_region_builder_add_rectangle (MetaRegionBuilder *builder,
int x,
int y,
@@ -95,7 +78,7 @@ meta_region_builder_add_rectangle (MetaRegionBuilder *builder,
{
if (builder->levels[i] == NULL)
{
if (i < MAX_LEVELS)
if (i < META_REGION_BUILDER_MAX_LEVELS)
{
builder->levels[i] = builder->levels[i - 1];
builder->levels[i - 1] = NULL;
@@ -115,7 +98,7 @@ meta_region_builder_add_rectangle (MetaRegionBuilder *builder,
}
}
static cairo_region_t *
cairo_region_t *
meta_region_builder_finish (MetaRegionBuilder *builder)
{
cairo_region_t *result = NULL;