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Dirty Rectangle (dirty-rectangle)

Track regions that need updating, optimizing incremental rendering.

Struct​

struct dirtylist_item_t {
    struct region_t region;
    int area;
};

struct dirtylist_t {
    struct dirtylist_item_t * items;
    unsigned int size;
    unsigned int count;
};

API​

FunctionDescription
dirtylist_alloc(size)Allocate dirty rectangle list
dirtylist_free(l)Free
dirtylist_clone(l, o)Clone
dirtylist_merge(l, o)Merge
dirtylist_clear(l)Clear
dirtylist_add(l, r)Add dirty region

Description​

The dirty rectangle list is sorted in descending order by area, used to track regions that need redrawing. The merge operation combines two lists, and sorting is performed before clearing for fast deduplication.