Line data Source code
1 : /*
2 : * Copyright (C) 2011-2013 Intel Corporation
3 : *
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:
10 : *
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.
14 : *
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.
22 : */
23 :
24 : #ifndef DRM_RECT_H
25 : #define DRM_RECT_H
26 :
27 : /**
28 : * DOC: rect utils
29 : *
30 : * Utility functions to help manage rectangular areas for
31 : * clipping, scaling, etc. calculations.
32 : */
33 :
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)
40 : */
41 : struct drm_rect {
42 : int x1, y1, x2, y2;
43 : };
44 :
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
50 : *
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.
54 : *
55 : * Positive @dw and @dh increase the size, negative values decrease it.
56 : */
57 0 : static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
58 : {
59 0 : r->x1 -= dw >> 1;
60 0 : r->y1 -= dh >> 1;
61 0 : r->x2 += (dw + 1) >> 1;
62 0 : r->y2 += (dh + 1) >> 1;
63 0 : }
64 :
65 : /**
66 : * drm_rect_translate - translate the rectangle
67 : * @r: rectangle to be tranlated
68 : * @dx: horizontal translation
69 : * @dy: vertical translation
70 : *
71 : * Move rectangle @r by @dx in the horizontal direction,
72 : * and by @dy in the vertical direction.
73 : */
74 : static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
75 : {
76 : r->x1 += dx;
77 : r->y1 += dy;
78 : r->x2 += dx;
79 : r->y2 += dy;
80 : }
81 :
82 : /**
83 : * drm_rect_downscale - downscale a rectangle
84 : * @r: rectangle to be downscaled
85 : * @horz: horizontal downscale factor
86 : * @vert: vertical downscale factor
87 : *
88 : * Divide the coordinates of rectangle @r by @horz and @vert.
89 : */
90 : static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
91 : {
92 : r->x1 /= horz;
93 : r->y1 /= vert;
94 : r->x2 /= horz;
95 : r->y2 /= vert;
96 : }
97 :
98 : /**
99 : * drm_rect_width - determine the rectangle width
100 : * @r: rectangle whose width is returned
101 : *
102 : * RETURNS:
103 : * The width of the rectangle.
104 : */
105 0 : static inline int drm_rect_width(const struct drm_rect *r)
106 : {
107 0 : return r->x2 - r->x1;
108 : }
109 :
110 : /**
111 : * drm_rect_height - determine the rectangle height
112 : * @r: rectangle whose height is returned
113 : *
114 : * RETURNS:
115 : * The height of the rectangle.
116 : */
117 0 : static inline int drm_rect_height(const struct drm_rect *r)
118 : {
119 0 : return r->y2 - r->y1;
120 : }
121 :
122 : /**
123 : * drm_rect_visible - determine if the the rectangle is visible
124 : * @r: rectangle whose visibility is returned
125 : *
126 : * RETURNS:
127 : * %true if the rectangle is visible, %false otherwise.
128 : */
129 0 : static inline bool drm_rect_visible(const struct drm_rect *r)
130 : {
131 0 : return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
132 : }
133 :
134 : /**
135 : * drm_rect_equals - determine if two rectangles are equal
136 : * @r1: first rectangle
137 : * @r2: second rectangle
138 : *
139 : * RETURNS:
140 : * %true if the rectangles are equal, %false otherwise.
141 : */
142 0 : static inline bool drm_rect_equals(const struct drm_rect *r1,
143 : const struct drm_rect *r2)
144 : {
145 0 : return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
146 0 : r1->y1 == r2->y1 && r1->y2 == r2->y2;
147 : }
148 :
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 struct drm_rect *r, bool fixed_point);
166 : void drm_rect_rotate(struct drm_rect *r,
167 : int width, int height,
168 : unsigned int rotation);
169 : void drm_rect_rotate_inv(struct drm_rect *r,
170 : int width, int height,
171 : unsigned int rotation);
172 :
173 : #endif
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