1.22. V4L2 rect helper functions

void v4l2_rect_set_size_to(struct v4l2_rect * r, const struct v4l2_rect * size)

copy the width/height values.

Parameters

struct v4l2_rect * r

rect whose width and height fields will be set

const struct v4l2_rect * size

rect containing the width and height fields you need.

void v4l2_rect_set_min_size(struct v4l2_rect * r, const struct v4l2_rect * min_size)

width and height of r should be >= min_size.

Parameters

struct v4l2_rect * r

rect whose width and height will be modified

const struct v4l2_rect * min_size

rect containing the minimal width and height

void v4l2_rect_set_max_size(struct v4l2_rect * r, const struct v4l2_rect * max_size)

width and height of r should be <= max_size

Parameters

struct v4l2_rect * r

rect whose width and height will be modified

const struct v4l2_rect * max_size

rect containing the maximum width and height

void v4l2_rect_map_inside(struct v4l2_rect * r, const struct v4l2_rect * boundary)

r should be inside boundary.

Parameters

struct v4l2_rect * r

rect that will be modified

const struct v4l2_rect * boundary

rect containing the boundary for r

bool v4l2_rect_same_size(const struct v4l2_rect * r1, const struct v4l2_rect * r2)

return true if r1 has the same size as r2

Parameters

const struct v4l2_rect * r1

rectangle.

const struct v4l2_rect * r2

rectangle.

Description

Return true if both rectangles have the same size.

void v4l2_rect_intersect(struct v4l2_rect * r, const struct v4l2_rect * r1, const struct v4l2_rect * r2)

calculate the intersection of two rects.

Parameters

struct v4l2_rect * r

intersection of r1 and r2.

const struct v4l2_rect * r1

rectangle.

const struct v4l2_rect * r2

rectangle.

void v4l2_rect_scale(struct v4l2_rect * r, const struct v4l2_rect * from, const struct v4l2_rect * to)

scale rect r by to/from

Parameters

struct v4l2_rect * r

rect to be scaled.

const struct v4l2_rect * from

from rectangle.

const struct v4l2_rect * to

to rectangle.

Description

This scales rectangle r horizontally by to->width / from->width and vertically by to->height / from->height.

Typically r is a rectangle inside from and you want the rectangle as it would appear after scaling from to to. So the resulting r will be the scaled rectangle inside to.

bool v4l2_rect_overlap(const struct v4l2_rect * r1, const struct v4l2_rect * r2)

do r1 and r2 overlap?

Parameters

const struct v4l2_rect * r1

rectangle.

const struct v4l2_rect * r2

rectangle.

Description

Returns true if r1 and r2 overlap.