reactos/win32ss/user/winsrv/consrv/include/rect.h

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS Console Server DLL
   4  * FILE:            consrv/include/rect.h
   5  * PURPOSE:         Rectangle helper functions
   6  * PROGRAMMERS:     Gé van Geldorp
   7  *                  Jeffrey Morlan
   8  */
   9
  10 #pragma once
  11
  12 #define ConioInitRect(Rect, top, left, bottom, right) \
  13 do {    \
  14     ((Rect)->Top) = top;    \
  15     ((Rect)->Left) = left;  \
  16     ((Rect)->Bottom) = bottom;  \
  17     ((Rect)->Right) = right;    \
  18 } while (0)
  19 #define ConioIsRectEmpty(Rect) \
  20     (((Rect)->Left > (Rect)->Right) || ((Rect)->Top > (Rect)->Bottom))
  21
  22 #define ConioRectHeight(Rect) \
  23     (((Rect)->Top) > ((Rect)->Bottom) ? 0 : ((Rect)->Bottom) - ((Rect)->Top) + 1)
  24 #define ConioRectWidth(Rect) \
  25     (((Rect)->Left) > ((Rect)->Right) ? 0 : ((Rect)->Right) - ((Rect)->Left) + 1)
  26
  27
  28 static __inline BOOLEAN
  29 ConioGetIntersection(OUT PSMALL_RECT Intersection,
  30                      IN PSMALL_RECT Rect1,
  31                      IN PSMALL_RECT Rect2)
  32 {
  33     if ( ConioIsRectEmpty(Rect1) ||
  34          ConioIsRectEmpty(Rect2) ||
  35         (Rect1->Top  > Rect2->Bottom) ||
  36         (Rect1->Left > Rect2->Right)  ||
  37         (Rect1->Bottom < Rect2->Top)  ||
  38         (Rect1->Right  < Rect2->Left) )
  39     {
  40         /* The rectangles do not intersect */
  41         ConioInitRect(Intersection, 0, -1, 0, -1);
  42         return FALSE;
  43     }
  44
  45     ConioInitRect(Intersection,
  46                   max(Rect1->Top   , Rect2->Top   ),
  47                   max(Rect1->Left  , Rect2->Left  ),
  48                   min(Rect1->Bottom, Rect2->Bottom),
  49                   min(Rect1->Right , Rect2->Right ));
  50
  51     return TRUE;
  52 }
  53
  54 static __inline BOOLEAN
  55 ConioGetUnion(OUT PSMALL_RECT Union,
  56               IN PSMALL_RECT Rect1,
  57               IN PSMALL_RECT Rect2)
  58 {
  59     if (ConioIsRectEmpty(Rect1))
  60     {
  61         if (ConioIsRectEmpty(Rect2))
  62         {
  63             ConioInitRect(Union, 0, -1, 0, -1);
  64             return FALSE;
  65         }
  66         else
  67         {
  68             *Union = *Rect2;
  69         }
  70     }
  71     else if (ConioIsRectEmpty(Rect2))
  72     {
  73         *Union = *Rect1;
  74     }
  75     else
  76     {
  77         ConioInitRect(Union,
  78                       min(Rect1->Top   , Rect2->Top   ),
  79                       min(Rect1->Left  , Rect2->Left  ),
  80                       max(Rect1->Bottom, Rect2->Bottom),
  81                       max(Rect1->Right , Rect2->Right ));
  82     }
  83
  84     return TRUE;
  85 }