Mercurial > MadButterfly
changeset 534:9f2d07a60493 Android_Skia
Document on clean_rdman_dirties()
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Sun, 27 Dec 2009 14:06:20 +0800 |
| parents | b51ae415f459 |
| children | a545f126d2bf |
| files | src/redraw_man.c |
| diffstat | 1 files changed, 29 insertions(+), 1 deletions(-) [+] |
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--- a/src/redraw_man.c Fri Dec 25 12:17:04 2009 +0800 +++ b/src/redraw_man.c Sun Dec 27 14:06:20 2009 +0800 @@ -1418,7 +1418,7 @@ compute_aggr_of_coord(coord); /* Areas of cached coords are computed in two phase. - * Phase 1 works like other normal ones. Phase 2, is collect + * Phase 1 works like other normal ones. Phase 2, collects * all areas of descendants to compute a minimum covering area. * Phase 2 is performed by zeroing_coord(). */ @@ -1860,6 +1860,34 @@ return OK; } +/* \brief Clean dirty coords and shapes. + * + * The procedure of clean dirty coords and shapes include 3 major steps. + * + * - Add dirty coords and shapes to rdman. + * - All descendants of a dirty coord are also dirty, except + * descent coords and their descendants. + * - Recompute aggregated transformation matrix from root to leaves + * for dirty coords. + * - The aggregated transformation matrix for a cached coord is + * different from other coords. + * - Compute new area for every dirty coord. + * - Area of a dirty coord is an aggregation of areas of all members. + * - A cached coord has two type of areas, one is for members of the cached + * coord, another one is for the block that cached coord and descendants + * will be mapped in parent cached coord. + * - Areas, for parent cached coord, of non-dirty cached coord + * would be recomputed when cleaning parent coord. + * - Areas, for members, of dirty cached coord would only be + * recomputed when cleaning the coord. + * - Propagate dirty areas to dirty area list of parent cached coord + * for every cached coords, not only for dirty cached coords. + * + * The cur_area of a cached coord is where members of the coord will + * be draw in cache buffer, i.e. surface. The area of the cached + * coord and descendants is described by cached_cur_area and + * cached_last_area in coord_canvas_info_t. + */ static int clean_rdman_dirties(redraw_man_t *rdman) { int r; int i;