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boxes: Ensure we scale to a fully rounded rectangle

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In order to scale a rectangle by a double value, we can reuse a ClutterRect
to do the scale computations in floating point math and then to convert it back
using the proper strategy that will take in account the subpixel compensation.

In this way we can be sure that the resulting rectangle can fully contain the
original scaled one.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/469
This commit is contained in:
Marco Trevisan (Treviño) 2019-03-01 20:47:07 +01:00 committed by Jonas Ådahl
parent 9c2fdcdbb2
commit 68fba458b3
1 changed files with 5 additions and 19 deletions
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24
src/core/boxes.c
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@ -2051,25 +2051,11 @@ meta_rectangle_scale_double (const MetaRectangle *rect,
MetaRoundingStrategy rounding_strategy,
MetaRectangle *dest)
{
switch (rounding_strategy)
{
case META_ROUNDING_STRATEGY_SHRINK:
*dest = (MetaRectangle) {
.x = (int) ceil (rect->x * scale),
.y = (int) ceil (rect->y * scale),
.width = (int) floor (rect->width * scale),
.height = (int) floor (rect->height * scale),
};
break;
case META_ROUNDING_STRATEGY_GROW:
*dest = (MetaRectangle) {
.x = (int) floor (rect->x * scale),
.y = (int) floor (rect->y * scale),
.width = (int) ceil (rect->width * scale),
.height = (int) ceil (rect->height * scale),
};
break;
}
ClutterRect tmp = CLUTTER_RECT_INIT (rect->x, rect->y,
rect->width, rect->height);
clutter_rect_scale (&tmp, scale, scale);
meta_rectangle_from_clutter_rect (&tmp, rounding_strategy, dest);
}
void