mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
[media] v4l2-rect.h: new header with struct v4l2_rect helper functions
This makes it easier to share this code with any driver that needs to manipulate the v4l2_rect datastructure. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
parent
fe29301122
commit
ac49de8c49
|
@ -233,6 +233,7 @@ X!Isound/sound_firmware.c
|
|||
!Iinclude/media/v4l2-mediabus.h
|
||||
!Iinclude/media/v4l2-mem2mem.h
|
||||
!Iinclude/media/v4l2-of.h
|
||||
!Iinclude/media/v4l2-rect.h
|
||||
!Iinclude/media/v4l2-subdev.h
|
||||
!Iinclude/media/videobuf2-core.h
|
||||
!Iinclude/media/videobuf2-v4l2.h
|
||||
|
|
173
include/media/v4l2-rect.h
Normal file
173
include/media/v4l2-rect.h
Normal file
|
@ -0,0 +1,173 @@
|
|||
/*
|
||||
* 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->width)
|
||||
r->left = boundary->width - r->width;
|
||||
if (r->top + r->height > boundary->height)
|
||||
r->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
|
Loading…
Reference in a new issue