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 /**
  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 hscale, int vscale);
 180 int drm_rect_calc_hscale(const struct drm_rect *src,
 181                          const struct drm_rect *dst,
 182                          int min_hscale, int max_hscale);
 183 int drm_rect_calc_vscale(const struct drm_rect *src,
 184                          const struct drm_rect *dst,
 185                          int min_vscale, int max_vscale);
 186 int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
 187                                  struct drm_rect *dst,
 188                                  int min_hscale, int max_hscale);
 189 int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
 190                                  struct drm_rect *dst,
 191                                  int min_vscale, int max_vscale);
 192 void drm_rect_debug_print(const char *prefix,
 193                           const struct drm_rect *r, bool fixed_point);
 194 void drm_rect_rotate(struct drm_rect *r,
 195                      int width, int height,
 196                      unsigned int rotation);
 197 void drm_rect_rotate_inv(struct drm_rect *r,
 198                          int width, int height,
 199                          unsigned int rotation);
 200
 201 #endif