include/drm/drm_rect.h

   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  */
  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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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