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 /*
  * Copyright (C) 2011-2013 Intel Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
 
 #ifndef DRM_RECT_H
 #define DRM_RECT_H
 
 #include <linux/types.h>
 
 /**
  * DOC: rect utils
  *
  * Utility functions to help manage rectangular areas for
  * clipping, scaling, etc. calculations.
  */
 
 /**
  * struct drm_rect - two dimensional rectangle
  * @x1: horizontal starting coordinate (inclusive)
  * @x2: horizontal ending coordinate (exclusive)
  * @y1: vertical starting coordinate (inclusive)
  * @y2: vertical ending coordinate (exclusive)
  *
  * Note that this must match the layout of struct drm_mode_rect or the damage
  * helpers like drm_atomic_helper_damage_iter_init() break.
  */
 struct drm_rect {
     int x1, y1, x2, y2;
 };
 
 /**
  * DRM_RECT_INIT - initialize a rectangle from x/y/w/h
  * @x: x coordinate
  * @y: y coordinate
  * @w: width
  * @h: height
  *
  * RETURNS:
  * A new rectangle of the specified size.
  */
 #define DRM_RECT_INIT(x, y, w, h) ((struct drm_rect){ \
         .x1 = (x), \
         .y1 = (y), \
         .x2 = (x) + (w), \
         .y2 = (y) + (h) })
 
 /**
  * DRM_RECT_FMT - printf string for &struct drm_rect
  */
 #define DRM_RECT_FMT    "%dx%d%+d%+d"
 /**
  * DRM_RECT_ARG - printf arguments for &struct drm_rect
  * @r: rectangle struct
  */
 #define DRM_RECT_ARG(r) drm_rect_width(r), drm_rect_height(r), (r)->x1, (r)->y1
 
 /**
  * DRM_RECT_FP_FMT - printf string for &struct drm_rect in 16.16 fixed point
  */
 #define DRM_RECT_FP_FMT "%d.%06ux%d.%06u%+d.%06u%+d.%06u"
 /**
  * DRM_RECT_FP_ARG - printf arguments for &struct drm_rect in 16.16 fixed point
  * @r: rectangle struct
  *
  * This is useful for e.g. printing plane source rectangles, which are in 16.16
  * fixed point.
  */
 #define DRM_RECT_FP_ARG(r) \
         drm_rect_width(r) >> 16, ((drm_rect_width(r) & 0xffff) * 15625) >> 10, \
         drm_rect_height(r) >> 16, ((drm_rect_height(r) & 0xffff) * 15625) >> 10, \
         (r)->x1 >> 16, (((r)->x1 & 0xffff) * 15625) >> 10, \
         (r)->y1 >> 16, (((r)->y1 & 0xffff) * 15625) >> 10
 
 /**
  * drm_rect_init - initialize the rectangle from x/y/w/h
  * @r: rectangle
  * @x: x coordinate
  * @y: y coordinate
  * @width: width
  * @height: height
  */
 static inline void drm_rect_init(struct drm_rect *r, int x, int y,
                  int width, int height)
 {
     r->x1 = x;
     r->y1 = y;
     r->x2 = x + width;
     r->y2 = y + height;
 }
 
 /**
  * drm_rect_adjust_size - adjust the size of the rectangle
  * @r: rectangle to be adjusted
  * @dw: horizontal adjustment
  * @dh: vertical adjustment
  *
  * Change the size of rectangle @r by @dw in the horizontal direction,
  * and by @dh in the vertical direction, while keeping the center
  * of @r stationary.
  *
  * Positive @dw and @dh increase the size, negative values decrease it.
  */
 static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
 {
     r->x1 -= dw >> 1;
     r->y1 -= dh >> 1;
     r->x2 += (dw + 1) >> 1;
     r->y2 += (dh + 1) >> 1;
 }
 
 /**
  * drm_rect_translate - translate the rectangle
  * @r: rectangle to be tranlated
  * @dx: horizontal translation
  * @dy: vertical translation
  *
  * Move rectangle @r by @dx in the horizontal direction,
  * and by @dy in the vertical direction.
  */
 static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
 {
     r->x1 += dx;
     r->y1 += dy;
     r->x2 += dx;
     r->y2 += dy;
 }
 
 /**
  * drm_rect_translate_to - translate the rectangle to an absolute position
  * @r: rectangle to be tranlated
  * @x: horizontal position
  * @y: vertical position
  *
  * Move rectangle @r to @x in the horizontal direction,
  * and to @y in the vertical direction.
  */
 static inline void drm_rect_translate_to(struct drm_rect *r, int x, int y)
 {
     drm_rect_translate(r, x - r->x1, y - r->y1);
 }
 
 /**
  * drm_rect_downscale - downscale a rectangle
  * @r: rectangle to be downscaled
  * @horz: horizontal downscale factor
  * @vert: vertical downscale factor
  *
  * Divide the coordinates of rectangle @r by @horz and @vert.
  */
 static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
 {
     r->x1 /= horz;
     r->y1 /= vert;
     r->x2 /= horz;
     r->y2 /= vert;
 }
 
 /**
  * drm_rect_width - determine the rectangle width
  * @r: rectangle whose width is returned
  *
  * RETURNS:
  * The width of the rectangle.
  */
 static inline int drm_rect_width(const struct drm_rect *r)
 {
     return r->x2 - r->x1;
 }
 
 /**
  * drm_rect_height - determine the rectangle height
  * @r: rectangle whose height is returned
  *
  * RETURNS:
  * The height of the rectangle.
  */
 static inline int drm_rect_height(const struct drm_rect *r)
 {
     return r->y2 - r->y1;
 }
 
 /**
  * drm_rect_visible - determine if the rectangle is visible
  * @r: rectangle whose visibility is returned
  *
  * RETURNS:
  * %true if the rectangle is visible, %false otherwise.
  */
 static inline bool drm_rect_visible(const struct drm_rect *r)
 {
     return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
 }
 
 /**
  * drm_rect_equals - determine if two rectangles are equal
  * @r1: first rectangle
  * @r2: second rectangle
  *
  * RETURNS:
  * %true if the rectangles are equal, %false otherwise.
  */
 static inline bool drm_rect_equals(const struct drm_rect *r1,
                    const struct drm_rect *r2)
 {
     return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
         r1->y1 == r2->y1 && r1->y2 == r2->y2;
 }
 
 /**
  * drm_rect_fp_to_int - Convert a rect in 16.16 fixed point form to int form.
  * @dst: rect to be stored the converted value
  * @src: rect in 16.16 fixed point form
  */
 static inline void drm_rect_fp_to_int(struct drm_rect *dst,
                       const struct drm_rect *src)
 {
     drm_rect_init(dst, src->x1 >> 16, src->y1 >> 16,
               drm_rect_width(src) >> 16,
               drm_rect_height(src) >> 16);
 }
 
 bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
               const struct drm_rect *clip);
 int drm_rect_calc_hscale(const struct drm_rect *src,
              const struct drm_rect *dst,
              int min_hscale, int max_hscale);
 int drm_rect_calc_vscale(const struct drm_rect *src,
              const struct drm_rect *dst,
              int min_vscale, int max_vscale);
 void drm_rect_debug_print(const char *prefix,
               const struct drm_rect *r, bool fixed_point);
 void drm_rect_rotate(struct drm_rect *r,
              int width, int height,
              unsigned int rotation);
 void drm_rect_rotate_inv(struct drm_rect *r,
              int width, int height,
              unsigned int rotation);
 
 #endif

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