Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / include / drm / drm_rect.h
blob83bb156d4356fa2dc3f936541a7d6cabc631b4dc
1 /*
2 * Copyright (C) 2011-2013 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
24 #ifndef DRM_RECT_H
25 #define DRM_RECT_H
27 /**
28 * DOC: rect utils
30 * Utility functions to help manage rectangular areas for
31 * clipping, scaling, etc. calculations.
34 /**
35 * struct drm_rect - two dimensional rectangle
36 * @x1: horizontal starting coordinate (inclusive)
37 * @x2: horizontal ending coordinate (exclusive)
38 * @y1: vertical starting coordinate (inclusive)
39 * @y2: vertical ending coordinate (exclusive)
41 struct drm_rect {
42 int x1, y1, x2, y2;
45 /**
46 * drm_rect_adjust_size - adjust the size of the rectangle
47 * @r: rectangle to be adjusted
48 * @dw: horizontal adjustment
49 * @dh: vertical adjustment
51 * Change the size of rectangle @r by @dw in the horizontal direction,
52 * and by @dh in the vertical direction, while keeping the center
53 * of @r stationary.
55 * Positive @dw and @dh increase the size, negative values decrease it.
57 static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
59 r->x1 -= dw >> 1;
60 r->y1 -= dh >> 1;
61 r->x2 += (dw + 1) >> 1;
62 r->y2 += (dh + 1) >> 1;
65 /**
66 * drm_rect_translate - translate the rectangle
67 * @r: rectangle to be tranlated
68 * @dx: horizontal translation
69 * @dy: vertical translation
71 * Move rectangle @r by @dx in the horizontal direction,
72 * and by @dy in the vertical direction.
74 static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
76 r->x1 += dx;
77 r->y1 += dy;
78 r->x2 += dx;
79 r->y2 += dy;
82 /**
83 * drm_rect_downscale - downscale a rectangle
84 * @r: rectangle to be downscaled
85 * @horz: horizontal downscale factor
86 * @vert: vertical downscale factor
88 * Divide the coordinates of rectangle @r by @horz and @vert.
90 static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
92 r->x1 /= horz;
93 r->y1 /= vert;
94 r->x2 /= horz;
95 r->y2 /= vert;
98 /**
99 * drm_rect_width - determine the rectangle width
100 * @r: rectangle whose width is returned
102 * RETURNS:
103 * The width of the rectangle.
105 static inline int drm_rect_width(const struct drm_rect *r)
107 return r->x2 - r->x1;
111 * drm_rect_height - determine the rectangle height
112 * @r: rectangle whose height is returned
114 * RETURNS:
115 * The height of the rectangle.
117 static inline int drm_rect_height(const struct drm_rect *r)
119 return r->y2 - r->y1;
123 * drm_rect_visible - determine if the the rectangle is visible
124 * @r: rectangle whose visibility is returned
126 * RETURNS:
127 * %true if the rectangle is visible, %false otherwise.
129 static inline bool drm_rect_visible(const struct drm_rect *r)
131 return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
135 * drm_rect_equals - determine if two rectangles are equal
136 * @r1: first rectangle
137 * @r2: second rectangle
139 * RETURNS:
140 * %true if the rectangles are equal, %false otherwise.
142 static inline bool drm_rect_equals(const struct drm_rect *r1,
143 const struct drm_rect *r2)
145 return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
146 r1->y1 == r2->y1 && r1->y2 == r2->y2;
149 bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
150 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
151 const struct drm_rect *clip,
152 int hscale, int vscale);
153 int drm_rect_calc_hscale(const struct drm_rect *src,
154 const struct drm_rect *dst,
155 int min_hscale, int max_hscale);
156 int drm_rect_calc_vscale(const struct drm_rect *src,
157 const struct drm_rect *dst,
158 int min_vscale, int max_vscale);
159 int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
160 struct drm_rect *dst,
161 int min_hscale, int max_hscale);
162 int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
163 struct drm_rect *dst,
164 int min_vscale, int max_vscale);
165 void drm_rect_debug_print(const char *prefix,
166 const struct drm_rect *r, bool fixed_point);
167 void drm_rect_rotate(struct drm_rect *r,
168 int width, int height,
169 unsigned int rotation);
170 void drm_rect_rotate_inv(struct drm_rect *r,
171 int width, int height,
172 unsigned int rotation);
174 #endif