1.22. V4L2 rect helper functions¶
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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.
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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
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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
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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
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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.
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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.
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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.
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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.