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TOMOYO Linux Cross Reference
Linux/include/drm/drm_rect.h

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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 /**
 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_FMT - printf string for &struct drm_rect
 47  */
 48 #define DRM_RECT_FMT    "%dx%d%+d%+d"
 49 /**
 50  * DRM_RECT_ARG - printf arguments for &struct drm_rect
 51  * @r: rectangle struct
 52  */
 53 #define DRM_RECT_ARG(r) drm_rect_width(r), drm_rect_height(r), (r)->x1, (r)->y1
 54 
 55 /**
 56  * DRM_RECT_FP_FMT - printf string for &struct drm_rect in 16.16 fixed point
 57  */
 58 #define DRM_RECT_FP_FMT "%d.%06ux%d.%06u%+d.%06u%+d.%06u"
 59 /**
 60  * DRM_RECT_FP_ARG - printf arguments for &struct drm_rect in 16.16 fixed point
 61  * @r: rectangle struct
 62  *
 63  * This is useful for e.g. printing plane source rectangles, which are in 16.16
 64  * fixed point.
 65  */
 66 #define DRM_RECT_FP_ARG(r) \
 67                 drm_rect_width(r) >> 16, ((drm_rect_width(r) & 0xffff) * 15625) >> 10, \
 68                 drm_rect_height(r) >> 16, ((drm_rect_height(r) & 0xffff) * 15625) >> 10, \
 69                 (r)->x1 >> 16, (((r)->x1 & 0xffff) * 15625) >> 10, \
 70                 (r)->y1 >> 16, (((r)->y1 & 0xffff) * 15625) >> 10
 71 
 72 /**
 73  * drm_rect_adjust_size - adjust the size of the rectangle
 74  * @r: rectangle to be adjusted
 75  * @dw: horizontal adjustment
 76  * @dh: vertical adjustment
 77  *
 78  * Change the size of rectangle @r by @dw in the horizontal direction,
 79  * and by @dh in the vertical direction, while keeping the center
 80  * of @r stationary.
 81  *
 82  * Positive @dw and @dh increase the size, negative values decrease it.
 83  */
 84 static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
 85 {
 86         r->x1 -= dw >> 1;
 87         r->y1 -= dh >> 1;
 88         r->x2 += (dw + 1) >> 1;
 89         r->y2 += (dh + 1) >> 1;
 90 }
 91 
 92 /**
 93  * drm_rect_translate - translate the rectangle
 94  * @r: rectangle to be tranlated
 95  * @dx: horizontal translation
 96  * @dy: vertical translation
 97  *
 98  * Move rectangle @r by @dx in the horizontal direction,
 99  * and by @dy in the vertical direction.
100  */
101 static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
102 {
103         r->x1 += dx;
104         r->y1 += dy;
105         r->x2 += dx;
106         r->y2 += dy;
107 }
108 
109 /**
110  * drm_rect_downscale - downscale a rectangle
111  * @r: rectangle to be downscaled
112  * @horz: horizontal downscale factor
113  * @vert: vertical downscale factor
114  *
115  * Divide the coordinates of rectangle @r by @horz and @vert.
116  */
117 static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
118 {
119         r->x1 /= horz;
120         r->y1 /= vert;
121         r->x2 /= horz;
122         r->y2 /= vert;
123 }
124 
125 /**
126  * drm_rect_width - determine the rectangle width
127  * @r: rectangle whose width is returned
128  *
129  * RETURNS:
130  * The width of the rectangle.
131  */
132 static inline int drm_rect_width(const struct drm_rect *r)
133 {
134         return r->x2 - r->x1;
135 }
136 
137 /**
138  * drm_rect_height - determine the rectangle height
139  * @r: rectangle whose height is returned
140  *
141  * RETURNS:
142  * The height of the rectangle.
143  */
144 static inline int drm_rect_height(const struct drm_rect *r)
145 {
146         return r->y2 - r->y1;
147 }
148 
149 /**
150  * drm_rect_visible - determine if the the rectangle is visible
151  * @r: rectangle whose visibility is returned
152  *
153  * RETURNS:
154  * %true if the rectangle is visible, %false otherwise.
155  */
156 static inline bool drm_rect_visible(const struct drm_rect *r)
157 {
158         return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
159 }
160 
161 /**
162  * drm_rect_equals - determine if two rectangles are equal
163  * @r1: first rectangle
164  * @r2: second rectangle
165  *
166  * RETURNS:
167  * %true if the rectangles are equal, %false otherwise.
168  */
169 static inline bool drm_rect_equals(const struct drm_rect *r1,
170                                    const struct drm_rect *r2)
171 {
172         return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
173                 r1->y1 == r2->y1 && r1->y2 == r2->y2;
174 }
175 
176 bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
177 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
178                           const struct drm_rect *clip);
179 int drm_rect_calc_hscale(const struct drm_rect *src,
180                          const struct drm_rect *dst,
181                          int min_hscale, int max_hscale);
182 int drm_rect_calc_vscale(const struct drm_rect *src,
183                          const struct drm_rect *dst,
184                          int min_vscale, int max_vscale);
185 int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
186                                  struct drm_rect *dst,
187                                  int min_hscale, int max_hscale);
188 int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
189                                  struct drm_rect *dst,
190                                  int min_vscale, int max_vscale);
191 void drm_rect_debug_print(const char *prefix,
192                           const struct drm_rect *r, bool fixed_point);
193 void drm_rect_rotate(struct drm_rect *r,
194                      int width, int height,
195                      unsigned int rotation);
196 void drm_rect_rotate_inv(struct drm_rect *r,
197                          int width, int height,
198                          unsigned int rotation);
199 
200 #endif
201 

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