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/*
* v4l2-rect.h - v4l2_rect helper functions
*
* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _V4L2_RECT_H_
#define _V4L2_RECT_H_
#include <linux/videodev2.h>
/**
* v4l2_rect_set_size_to() - copy the width/height values.
* @r: rect whose width and height fields will be set
* @size: rect containing the width and height fields you need.
*/
static inline void v4l2_rect_set_size_to(struct v4l2_rect *r,
const struct v4l2_rect *size)
{
r->width = size->width;
r->height = size->height;
}
/**
* v4l2_rect_set_min_size() - width and height of r should be >= min_size.
* @r: rect whose width and height will be modified
* @min_size: rect containing the minimal width and height
*/
static inline void v4l2_rect_set_min_size(struct v4l2_rect *r,
const struct v4l2_rect *min_size)
{
if (r->width < min_size->width)
r->width = min_size->width;
if (r->height < min_size->height)
r->height = min_size->height;
}
/**
* v4l2_rect_set_max_size() - width and height of r should be <= max_size
* @r: rect whose width and height will be modified
* @max_size: rect containing the maximum width and height
*/
static inline void v4l2_rect_set_max_size(struct v4l2_rect *r,
const struct v4l2_rect *max_size)
{
if (r->width > max_size->width)
r->width = max_size->width;
if (r->height > max_size->height)
r->height = max_size->height;
}
/**
* v4l2_rect_map_inside()- r should be inside boundary.
* @r: rect that will be modified
* @boundary: rect containing the boundary for @r
*/
static inline void v4l2_rect_map_inside(struct v4l2_rect *r,
const struct v4l2_rect *boundary)
{
v4l2_rect_set_max_size(r, boundary);
if (r->left < boundary->left)
r->left = boundary->left;
if (r->top < boundary->top)
r->top = boundary->top;
if (r->left + r->width > boundary->left + boundary->width)
r->left = boundary->left + boundary->width - r->width;
if (r->top + r->height > boundary->top + boundary->height)
r->top = boundary->top + boundary->height - r->height;
}
/**
* v4l2_rect_same_size() - return true if r1 has the same size as r2
* @r1: rectangle.
* @r2: rectangle.
*
* Return true if both rectangles have the same size.
*/
static inline bool v4l2_rect_same_size(const struct v4l2_rect *r1,
const struct v4l2_rect *r2)
{
return r1->width == r2->width && r1->height == r2->height;
}
/**
* v4l2_rect_intersect() - calculate the intersection of two rects.
* @r: intersection of @r1 and @r2.
* @r1: rectangle.
* @r2: rectangle.
*/
static inline void v4l2_rect_intersect(struct v4l2_rect *r,
const struct v4l2_rect *r1,
const struct v4l2_rect *r2)
{
int right, bottom;
r->top = max(r1->top, r2->top);
r->left = max(r1->left, r2->left);
bottom = min(r1->top + r1->height, r2->top + r2->height);
right = min(r1->left + r1->width, r2->left + r2->width);
r->height = max(0, bottom - r->top);
r->width = max(0, right - r->left);
}
/**
* v4l2_rect_scale() - scale rect r by to/from
* @r: rect to be scaled.
* @from: from rectangle.
* @to: to rectangle.
*
* 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.
*/
static inline void v4l2_rect_scale(struct v4l2_rect *r,
const struct v4l2_rect *from,
const struct v4l2_rect *to)
{
if (from->width == 0 || from->height == 0) {
r->left = r->top = r->width = r->height = 0;
return;
}
r->left = (((r->left - from->left) * to->width) / from->width) & ~1;
r->width = ((r->width * to->width) / from->width) & ~1;
r->top = ((r->top - from->top) * to->height) / from->height;
r->height = (r->height * to->height) / from->height;
}
/**
* v4l2_rect_overlap() - do r1 and r2 overlap?
* @r1: rectangle.
* @r2: rectangle.
*
* Returns true if @r1 and @r2 overlap.
*/
static inline bool v4l2_rect_overlap(const struct v4l2_rect *r1,
const struct v4l2_rect *r2)
{
/*
* IF the left side of r1 is to the right of the right side of r2 OR
* the left side of r2 is to the right of the right side of r1 THEN
* they do not overlap.
*/
if (r1->left >= r2->left + r2->width ||
r2->left >= r1->left + r1->width)
return false;
/*
* IF the top side of r1 is below the bottom of r2 OR
* the top side of r2 is below the bottom of r1 THEN
* they do not overlap.
*/
if (r1->top >= r2->top + r2->height ||
r2->top >= r1->top + r1->height)
return false;
return true;
}
#endif
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