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clutter/rect: Clamp to pixel taking care of subpixel values

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The clamped rectangle currently could not fully contain the original fractional
rectangle because it doesn't take care of the fact that the new width should
consider the fact that flooring we'd translate the rectangle, and thus to cover
the same area we need to take care of it.

So, to properly compute the width and height, calculate x2 and y2 first and then
use this ceiled value to compute the actual width using the floored x1 and y1.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/3
This commit is contained in:
Marco Trevisan (Treviño) 2019-03-01 02:49:19 +01:00
parent ceb4fe2151
commit 8bc8dc66f2
1 changed files with 7 additions and 2 deletions
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9
clutter/clutter/clutter-base-types.c
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@ -1160,15 +1160,20 @@ clutter_rect_inset (ClutterRect *rect,
void
clutter_rect_clamp_to_pixel (ClutterRect *rect)
{
float x2, y2;
g_return_if_fail (rect != NULL);
clutter_rect_normalize_internal (rect);
x2 = rect->origin.x + rect->size.width;
y2 = rect->origin.y + rect->size.height;
rect->origin.x = floorf (rect->origin.x);
rect->origin.y = floorf (rect->origin.y);
rect->size.width = ceilf (rect->size.width);
rect->size.height = ceilf (rect->size.height);
rect->size.width = ceilf (x2) - rect->origin.x;
rect->size.height = ceilf (y2) - rect->origin.y;
}
/**