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 #include <linux/types.h>
28
29 /**
30 * DOC: rect utils
31 *
32 * Utility functions to help manage rectangular areas for
33 * clipping, scaling, etc. calculations.
34 */
35
36 /**
37 * struct drm_rect - two dimensional rectangle
38 * @x1: horizontal starting coordinate (inclusive)
39 * @x2: horizontal ending coordinate (exclusive)
40 * @y1: vertical starting coordinate (inclusive)
41 * @y2: vertical ending coordinate (exclusive)
42 */
43 struct drm_rect {
44 int x1, y1, x2, y2;
45 };
46
47 /**
48 * DRM_RECT_FMT - printf string for &struct drm_rect
49 */
50 #define DRM_RECT_FMT "%dx%d%+d%+d"
51 /**
52 * DRM_RECT_ARG - printf arguments for &struct drm_rect
53 * @r: rectangle struct
54 */
55 #define DRM_RECT_ARG(r) drm_rect_width(r), drm_rect_height(r), (r)->x1, (r)->y1
56
57 /**
58 * DRM_RECT_FP_FMT - printf string for &struct drm_rect in 16.16 fixed point
59 */
60 #define DRM_RECT_FP_FMT "%d.%06ux%d.%06u%+d.%06u%+d.%06u"
61 /**
62 * DRM_RECT_FP_ARG - printf arguments for &struct drm_rect in 16.16 fixed point
63 * @r: rectangle struct
64 *
65 * This is useful for e.g. printing plane source rectangles, which are in 16.16
66 * fixed point.
67 */
68 #define DRM_RECT_FP_ARG(r) \
69 drm_rect_width(r) >> 16, ((drm_rect_width(r) & 0xffff) * 15625) >> 10, \
70 drm_rect_height(r) >> 16, ((drm_rect_height(r) & 0xffff) * 15625) >> 10, \
71 (r)->x1 >> 16, (((r)->x1 & 0xffff) * 15625) >> 10, \
72 (r)->y1 >> 16, (((r)->y1 & 0xffff) * 15625) >> 10
73
74 /**
75 * drm_rect_init - initialize the rectangle from x/y/w/h
76 * @r: rectangle
77 * @x: x coordinate
78 * @y: y coordinate
79 * @width: width
80 * @height: height
81 */
drm_rect_init(struct drm_rect * r,int x,int y,int width,int height)82 static inline void drm_rect_init(struct drm_rect *r, int x, int y,
83 int width, int height)
84 {
85 r->x1 = x;
86 r->y1 = y;
87 r->x2 = x + width;
88 r->y2 = y + height;
89 }
90
91 /**
92 * drm_rect_adjust_size - adjust the size of the rectangle
93 * @r: rectangle to be adjusted
94 * @dw: horizontal adjustment
95 * @dh: vertical adjustment
96 *
97 * Change the size of rectangle @r by @dw in the horizontal direction,
98 * and by @dh in the vertical direction, while keeping the center
99 * of @r stationary.
100 *
101 * Positive @dw and @dh increase the size, negative values decrease it.
102 */
drm_rect_adjust_size(struct drm_rect * r,int dw,int dh)103 static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
104 {
105 r->x1 -= dw >> 1;
106 r->y1 -= dh >> 1;
107 r->x2 += (dw + 1) >> 1;
108 r->y2 += (dh + 1) >> 1;
109 }
110
111 /**
112 * drm_rect_translate - translate the rectangle
113 * @r: rectangle to be tranlated
114 * @dx: horizontal translation
115 * @dy: vertical translation
116 *
117 * Move rectangle @r by @dx in the horizontal direction,
118 * and by @dy in the vertical direction.
119 */
drm_rect_translate(struct drm_rect * r,int dx,int dy)120 static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
121 {
122 r->x1 += dx;
123 r->y1 += dy;
124 r->x2 += dx;
125 r->y2 += dy;
126 }
127
128 /**
129 * drm_rect_translate_to - translate the rectangle to an absolute position
130 * @r: rectangle to be tranlated
131 * @x: horizontal position
132 * @y: vertical position
133 *
134 * Move rectangle @r to @x in the horizontal direction,
135 * and to @y in the vertical direction.
136 */
drm_rect_translate_to(struct drm_rect * r,int x,int y)137 static inline void drm_rect_translate_to(struct drm_rect *r, int x, int y)
138 {
139 drm_rect_translate(r, x - r->x1, y - r->y1);
140 }
141
142 /**
143 * drm_rect_downscale - downscale a rectangle
144 * @r: rectangle to be downscaled
145 * @horz: horizontal downscale factor
146 * @vert: vertical downscale factor
147 *
148 * Divide the coordinates of rectangle @r by @horz and @vert.
149 */
drm_rect_downscale(struct drm_rect * r,int horz,int vert)150 static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
151 {
152 r->x1 /= horz;
153 r->y1 /= vert;
154 r->x2 /= horz;
155 r->y2 /= vert;
156 }
157
158 /**
159 * drm_rect_width - determine the rectangle width
160 * @r: rectangle whose width is returned
161 *
162 * RETURNS:
163 * The width of the rectangle.
164 */
drm_rect_width(const struct drm_rect * r)165 static inline int drm_rect_width(const struct drm_rect *r)
166 {
167 return r->x2 - r->x1;
168 }
169
170 /**
171 * drm_rect_height - determine the rectangle height
172 * @r: rectangle whose height is returned
173 *
174 * RETURNS:
175 * The height of the rectangle.
176 */
drm_rect_height(const struct drm_rect * r)177 static inline int drm_rect_height(const struct drm_rect *r)
178 {
179 return r->y2 - r->y1;
180 }
181
182 /**
183 * drm_rect_visible - determine if the rectangle is visible
184 * @r: rectangle whose visibility is returned
185 *
186 * RETURNS:
187 * %true if the rectangle is visible, %false otherwise.
188 */
drm_rect_visible(const struct drm_rect * r)189 static inline bool drm_rect_visible(const struct drm_rect *r)
190 {
191 return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
192 }
193
194 /**
195 * drm_rect_equals - determine if two rectangles are equal
196 * @r1: first rectangle
197 * @r2: second rectangle
198 *
199 * RETURNS:
200 * %true if the rectangles are equal, %false otherwise.
201 */
drm_rect_equals(const struct drm_rect * r1,const struct drm_rect * r2)202 static inline bool drm_rect_equals(const struct drm_rect *r1,
203 const struct drm_rect *r2)
204 {
205 return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
206 r1->y1 == r2->y1 && r1->y2 == r2->y2;
207 }
208
209 bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
210 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
211 const struct drm_rect *clip);
212 int drm_rect_calc_hscale(const struct drm_rect *src,
213 const struct drm_rect *dst,
214 int min_hscale, int max_hscale);
215 int drm_rect_calc_vscale(const struct drm_rect *src,
216 const struct drm_rect *dst,
217 int min_vscale, int max_vscale);
218 void drm_rect_debug_print(const char *prefix,
219 const struct drm_rect *r, bool fixed_point);
220 void drm_rect_rotate(struct drm_rect *r,
221 int width, int height,
222 unsigned int rotation);
223 void drm_rect_rotate_inv(struct drm_rect *r,
224 int width, int height,
225 unsigned int rotation);
226
227 #endif
228