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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 * Note that this must match the layout of struct drm_mode_rect or the damage
44 * helpers like drm_atomic_helper_damage_iter_init() break.
45 */
46struct drm_rect {
47 int x1, y1, x2, y2;
48};
49
50/**
51 * DRM_RECT_INIT - initialize a rectangle from x/y/w/h
52 * @x: x coordinate
53 * @y: y coordinate
54 * @w: width
55 * @h: height
56 *
57 * RETURNS:
58 * A new rectangle of the specified size.
59 */
60#define DRM_RECT_INIT(x, y, w, h) ((struct drm_rect){ \
61 .x1 = (x), \
62 .y1 = (y), \
63 .x2 = (x) + (w), \
64 .y2 = (y) + (h) })
65
66/**
67 * DRM_RECT_FMT - printf string for &struct drm_rect
68 */
69#define DRM_RECT_FMT "%dx%d%+d%+d"
70/**
71 * DRM_RECT_ARG - printf arguments for &struct drm_rect
72 * @r: rectangle struct
73 */
74#define DRM_RECT_ARG(r) drm_rect_width(r), drm_rect_height(r), (r)->x1, (r)->y1
75
76/**
77 * DRM_RECT_FP_FMT - printf string for &struct drm_rect in 16.16 fixed point
78 */
79#define DRM_RECT_FP_FMT "%d.%06ux%d.%06u%+d.%06u%+d.%06u"
80/**
81 * DRM_RECT_FP_ARG - printf arguments for &struct drm_rect in 16.16 fixed point
82 * @r: rectangle struct
83 *
84 * This is useful for e.g. printing plane source rectangles, which are in 16.16
85 * fixed point.
86 */
87#define DRM_RECT_FP_ARG(r) \
88 drm_rect_width(r) >> 16, ((drm_rect_width(r) & 0xffff) * 15625) >> 10, \
89 drm_rect_height(r) >> 16, ((drm_rect_height(r) & 0xffff) * 15625) >> 10, \
90 (r)->x1 >> 16, (((r)->x1 & 0xffff) * 15625) >> 10, \
91 (r)->y1 >> 16, (((r)->y1 & 0xffff) * 15625) >> 10
92
93/**
94 * drm_rect_init - initialize the rectangle from x/y/w/h
95 * @r: rectangle
96 * @x: x coordinate
97 * @y: y coordinate
98 * @width: width
99 * @height: height
100 */
101static inline void drm_rect_init(struct drm_rect *r, int x, int y,
102 int width, int height)
103{
104 r->x1 = x;
105 r->y1 = y;
106 r->x2 = x + width;
107 r->y2 = y + height;
108}
109
110/**
111 * drm_rect_adjust_size - adjust the size of the rectangle
112 * @r: rectangle to be adjusted
113 * @dw: horizontal adjustment
114 * @dh: vertical adjustment
115 *
116 * Change the size of rectangle @r by @dw in the horizontal direction,
117 * and by @dh in the vertical direction, while keeping the center
118 * of @r stationary.
119 *
120 * Positive @dw and @dh increase the size, negative values decrease it.
121 */
122static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
123{
124 r->x1 -= dw >> 1;
125 r->y1 -= dh >> 1;
126 r->x2 += (dw + 1) >> 1;
127 r->y2 += (dh + 1) >> 1;
128}
129
130/**
131 * drm_rect_translate - translate the rectangle
132 * @r: rectangle to be translated
133 * @dx: horizontal translation
134 * @dy: vertical translation
135 *
136 * Move rectangle @r by @dx in the horizontal direction,
137 * and by @dy in the vertical direction.
138 */
139static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
140{
141 r->x1 += dx;
142 r->y1 += dy;
143 r->x2 += dx;
144 r->y2 += dy;
145}
146
147/**
148 * drm_rect_translate_to - translate the rectangle to an absolute position
149 * @r: rectangle to be translated
150 * @x: horizontal position
151 * @y: vertical position
152 *
153 * Move rectangle @r to @x in the horizontal direction,
154 * and to @y in the vertical direction.
155 */
156static inline void drm_rect_translate_to(struct drm_rect *r, int x, int y)
157{
158 drm_rect_translate(r, x - r->x1, y - r->y1);
159}
160
161/**
162 * drm_rect_downscale - downscale a rectangle
163 * @r: rectangle to be downscaled
164 * @horz: horizontal downscale factor
165 * @vert: vertical downscale factor
166 *
167 * Divide the coordinates of rectangle @r by @horz and @vert.
168 */
169static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
170{
171 r->x1 /= horz;
172 r->y1 /= vert;
173 r->x2 /= horz;
174 r->y2 /= vert;
175}
176
177/**
178 * drm_rect_width - determine the rectangle width
179 * @r: rectangle whose width is returned
180 *
181 * RETURNS:
182 * The width of the rectangle.
183 */
184static inline int drm_rect_width(const struct drm_rect *r)
185{
186 return r->x2 - r->x1;
187}
188
189/**
190 * drm_rect_height - determine the rectangle height
191 * @r: rectangle whose height is returned
192 *
193 * RETURNS:
194 * The height of the rectangle.
195 */
196static inline int drm_rect_height(const struct drm_rect *r)
197{
198 return r->y2 - r->y1;
199}
200
201/**
202 * drm_rect_visible - determine if the rectangle is visible
203 * @r: rectangle whose visibility is returned
204 *
205 * RETURNS:
206 * %true if the rectangle is visible, %false otherwise.
207 */
208static inline bool drm_rect_visible(const struct drm_rect *r)
209{
210 return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
211}
212
213/**
214 * drm_rect_equals - determine if two rectangles are equal
215 * @r1: first rectangle
216 * @r2: second rectangle
217 *
218 * RETURNS:
219 * %true if the rectangles are equal, %false otherwise.
220 */
221static inline bool drm_rect_equals(const struct drm_rect *r1,
222 const struct drm_rect *r2)
223{
224 return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
225 r1->y1 == r2->y1 && r1->y2 == r2->y2;
226}
227
228/**
229 * drm_rect_fp_to_int - Convert a rect in 16.16 fixed point form to int form.
230 * @dst: rect to be stored the converted value
231 * @src: rect in 16.16 fixed point form
232 */
233static inline void drm_rect_fp_to_int(struct drm_rect *dst,
234 const struct drm_rect *src)
235{
236 drm_rect_init(dst, src->x1 >> 16, src->y1 >> 16,
237 drm_rect_width(src) >> 16,
238 drm_rect_height(src) >> 16);
239}
240
241/**
242 * drm_rect_overlap - Check if two rectangles overlap
243 * @a: first rectangle
244 * @b: second rectangle
245 *
246 * RETURNS:
247 * %true if the rectangles overlap, %false otherwise.
248 */
249static inline bool drm_rect_overlap(const struct drm_rect *a,
250 const struct drm_rect *b)
251{
252 return (a->x2 > b->x1 && b->x2 > a->x1 &&
253 a->y2 > b->y1 && b->y2 > a->y1);
254}
255
256bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
257bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
258 const struct drm_rect *clip);
259int drm_rect_calc_hscale(const struct drm_rect *src,
260 const struct drm_rect *dst,
261 int min_hscale, int max_hscale);
262int drm_rect_calc_vscale(const struct drm_rect *src,
263 const struct drm_rect *dst,
264 int min_vscale, int max_vscale);
265void drm_rect_debug_print(const char *prefix,
266 const struct drm_rect *r, bool fixed_point);
267void drm_rect_rotate(struct drm_rect *r,
268 int width, int height,
269 unsigned int rotation);
270void drm_rect_rotate_inv(struct drm_rect *r,
271 int width, int height,
272 unsigned int rotation);
273
274#endif