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cogl-atlas: Try the next size when there would be less than 6% waste

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Previously when the atlas needs to be migrated it would start by
trying with the same size as the existing atlas if there is enough
space for the new texture. However even if the atlas is completely
sorted there will always be some amount of waste so when the atlas
needs to grow it would usually end up redundantly trying the same size
when it is very unlikely to fit. This patch changes it so that there
must be at least 6% waste available after the new texture is added
otherwise it will start with the next atlas size.
This commit is contained in:
Neil Roberts 2010-08-06 18:42:43 +01:00
parent f98be241a8
commit 2b5bb06bed
1 changed files with 7 additions and 5 deletions
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12
clutter/cogl/cogl/cogl-atlas.c
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@ -496,11 +496,13 @@ _cogl_atlas_reserve_space (CoglAtlas *atlas,
map_width = _cogl_rectangle_map_get_width (atlas->map); map_width = _cogl_rectangle_map_get_width (atlas->map);
map_height = _cogl_rectangle_map_get_height (atlas->map); map_height = _cogl_rectangle_map_get_height (atlas->map);
/* If there is enough space in the existing for the new /* If there is enough space in for the new rectangle in the
rectangle in the existing atlas we'll start with the same existing atlas with at least 6% waste we'll start with the
size, otherwise we'll immediately double it */ same size, otherwise we'll immediately double it */
if (_cogl_rectangle_map_get_remaining_space (atlas->map) < if ((map_width * map_height -
width * height) _cogl_rectangle_map_get_remaining_space (atlas->map) +
width * height) * 53 / 50 >
map_width * map_height)
_cogl_atlas_get_next_size (&map_width, &map_height); _cogl_atlas_get_next_size (&map_width, &map_height);
} }
else else