diff options
| -rw-r--r-- | include/wlr/util/region.h | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/include/wlr/util/region.h b/include/wlr/util/region.h index 948307a1..ccd926fd 100644 --- a/include/wlr/util/region.h +++ b/include/wlr/util/region.h @@ -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); |