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region: add docs for wlr_region_scale_xy() and wlr_region_confine()

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Simon Ser 2022-11-27 11:22:24 +01:00 committed by Kirill Primak
parent f81c3d93cd
commit 57d7d79982
1 changed files with 21 additions and 2 deletions
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23
include/wlr/util/region.h
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@ -21,14 +21,26 @@
#include <wayland-server-protocol.h>
/**
* Scales a region, ie. multiplies all its coordinates by `scale`.
* Scale a region by the specified factor.
*
* The resulting coordinates are rounded up or down so that the new region is
* at least as big as the original one.
* at least as big as the original one if the scale factor is greater or equal
* to 1.
*
* Also see wlr_region_scale_xy().
*/
void wlr_region_scale(pixman_region32_t *dst, const pixman_region32_t *src,
float scale);
/**
* Scale a region by the specified factors.
*
* The X and Y coordinates are scaled separately by scale_x and scale_y.
*
* The resulting coordinates are rounded up or down so that the new region is
* at least as big as the original one if the scale factor is greater or equal
* to 1.
*/
void wlr_region_scale_xy(pixman_region32_t *dst, const pixman_region32_t *src,
float scale_x, float scale_y);
@ -52,6 +64,13 @@ void wlr_region_expand(pixman_region32_t *dst, const pixman_region32_t *src,
void wlr_region_rotated_bounds(pixman_region32_t *dst, const pixman_region32_t *src,
float rotation, int ox, int oy);
/**
* Confine a point inside a region.
*
* x1 and y1 are the old position, x2 and y2 are the new tentative position.
* The function returns true with confined coordinates in x2_out and y2_out if
* the old position is within the region, or false otherwise.
*/
bool wlr_region_confine(const pixman_region32_t *region, double x1, double y1, double x2,
double y2, double *x2_out, double *y2_out);