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clutter/rect: Add utility function to scale the rectangle

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Scale coordinates and size of the rectangle by the passed value.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/3
This commit is contained in:
Marco Trevisan (Treviño) 2019-03-01 14:38:23 +01:00
parent 8bc8dc66f2
commit 9d9d455bba
2 changed files with 34 additions and 4 deletions
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34
clutter/clutter/clutter-base-types.c
View File

@ -1146,14 +1146,40 @@ clutter_rect_inset (ClutterRect *rect,
rect->size.height = 0.f;
}
/**
* clutter_rect_scale:
* @rect: a #ClutterRect
* @s_x: an horizontal scale value
* @s_y: a vertical scale value
*
* Scale the rectangle coordinates and size by @s_x horizontally and
* @s_y vertically.
*/
void
clutter_rect_scale (ClutterRect *rect,
float s_x,
float s_y)
{
g_return_if_fail (rect != NULL);
g_return_if_fail (s_x > 0.f);
g_return_if_fail (s_y > 0.f);
clutter_rect_normalize_internal (rect);
rect->origin.x *= s_x;
rect->origin.y *= s_y;
rect->size.width *= s_x;
rect->size.height *= s_y;
}
/**
* clutter_rect_clamp_to_pixel:
* @rect: a #ClutterRect
*
* Rounds the origin of @rect downwards to the nearest integer, and rounds
* the size of @rect upwards to the nearest integer, so that @rect is
* updated to the smallest rectangle capable of fully containing the
* original, fractional rectangle.
* Rounds the origin of @rect downwards to the nearest integer, and recompute the
* the size using the @rect origin and size rounded upwards to the nearest integer,
* so that @rect is updated to the smallest rectangle capable of fully containing
* the original, fractional rectangle in the coordinates space.
*
* Since: 1.12
*/

4
clutter/clutter/clutter-types.h
View File

@ -361,6 +361,10 @@ void clutter_rect_inset (ClutterRect *rect
float d_x,
float d_y);
CLUTTER_EXPORT
void clutter_rect_scale (ClutterRect *rect,
float s_x,
float s_y);
CLUTTER_EXPORT
void clutter_rect_clamp_to_pixel (ClutterRect *rect);
CLUTTER_EXPORT
float clutter_rect_get_x (ClutterRect *rect);