78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*
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* This is a stable interface of wlroots. Future changes will be limited to:
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*
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* - New functions
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* - New struct members
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* - New enum members
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*
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* Note that wlroots does not make an ABI compatibility promise - in the future,
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* the layout and size of structs used by wlroots may change, requiring code
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* depending on this header to be recompiled (but not edited).
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*
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* Breaking changes are announced in the release notes and follow a 1-year
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* deprecation schedule.
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*/
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#ifndef WLR_UTIL_REGION_H
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#define WLR_UTIL_REGION_H
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#include <stdbool.h>
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#include <pixman.h>
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#include <wayland-server-protocol.h>
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/**
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* Scale a region by the specified factor.
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*
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* The resulting coordinates are rounded up or down so that the new region is
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* at least as big as the original one if the scale factor is greater or equal
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* to 1.
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*
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* Also see wlr_region_scale_xy().
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*/
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void wlr_region_scale(pixman_region32_t *dst, const pixman_region32_t *src,
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float scale);
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/**
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* Scale a region by the specified factors.
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*
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* The X and Y coordinates are scaled separately by scale_x and scale_y.
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*
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* The resulting coordinates are rounded up or down so that the new region is
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* at least as big as the original one if the scale factor is greater or equal
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* to 1.
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*/
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void wlr_region_scale_xy(pixman_region32_t *dst, const pixman_region32_t *src,
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float scale_x, float scale_y);
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/**
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* Applies a transform to a region inside a box of size `width` x `height`.
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*/
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void wlr_region_transform(pixman_region32_t *dst, const pixman_region32_t *src,
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enum wl_output_transform transform, int width, int height);
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/**
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* Expands the region by distance on both axis. distance must be
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* a non-negative number.
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*/
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void wlr_region_expand(pixman_region32_t *dst, const pixman_region32_t *src,
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int distance);
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/*
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* Builds the smallest possible region that contains the region rotated about
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* the point (ox, oy).
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*/
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void wlr_region_rotated_bounds(pixman_region32_t *dst, const pixman_region32_t *src,
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float rotation, int ox, int oy);
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/**
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* Confine a point inside a region.
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*
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* x1 and y1 are the old position, x2 and y2 are the new tentative position.
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* The function returns true with confined coordinates in x2_out and y2_out if
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* the old position is within the region, or false otherwise.
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*/
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bool wlr_region_confine(const pixman_region32_t *region, double x1, double y1, double x2,
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double y2, double *x2_out, double *y2_out);
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#endif
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