win32ss/gdi/ntgdi/rect.c

   1 /*
   2  * PROJECT:         ReactOS win32 kernel mode subsystem
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            subsystems/win32/win32k/objects/rect.c
   5  * PURPOSE:         Rect functions
   6  * PROGRAMMER:      Timo Kreuzer
   7  */
   8
   9 #include <win32k.h>
  10
  11 #define NDEBUG
  12 #include <debug.h>
  13
  14 /* FUNCTIONS *****************************************************************/
  15
  16 BOOL
  17 FASTCALL
  18 RECTL_bUnionRect(RECTL *prclDst, const RECTL *prcl1, const RECTL *prcl2)
  19 {
  20     if (RECTL_bIsEmptyRect(prcl1))
  21     {
  22         if (RECTL_bIsEmptyRect(prcl2))
  23             {
  24                 RECTL_vSetEmptyRect(prclDst);
  25                 return FALSE;
  26             }
  27         else
  28             {
  29                 *prclDst = *prcl2;
  30             }
  31     }
  32     else
  33     {
  34         if (RECTL_bIsEmptyRect(prcl2))
  35             {
  36                 *prclDst = *prcl1;
  37             }
  38         else
  39             {
  40                 prclDst->left = min(prcl1->left, prcl2->left);
  41                 prclDst->top = min(prcl1->top, prcl2->top);
  42                 prclDst->right = max(prcl1->right, prcl2->right);
  43                 prclDst->bottom = max(prcl1->bottom, prcl2->bottom);
  44             }
  45     }
  46
  47     return TRUE;
  48 }
  49
  50
  51 BOOL
  52 FASTCALL
  53 RECTL_bIntersectRect(RECTL* prclDst, const RECTL* prcl1, const RECTL* prcl2)
  54 {
  55     prclDst->left  = max(prcl1->left, prcl2->left);
  56     prclDst->right = min(prcl1->right, prcl2->right);
  57
  58     if (prclDst->left < prclDst->right)
  59     {
  60         prclDst->top    = max(prcl1->top, prcl2->top);
  61         prclDst->bottom = min(prcl1->bottom, prcl2->bottom);
  62
  63         if (prclDst->top < prclDst->bottom)
  64         {
  65             return TRUE;
  66         }
  67     }
  68
  69     RECTL_vSetEmptyRect(prclDst);
  70
  71     return FALSE;
  72 }
  73
  74 VOID
  75 FASTCALL
  76 RECTL_vMakeWellOrdered(RECTL *prcl)
  77 {
  78     LONG lTmp;
  79     if (prcl->left > prcl->right)
  80     {
  81         lTmp = prcl->left;
  82         prcl->left = prcl->right;
  83         prcl->right = lTmp;
  84     }
  85     if (prcl->top > prcl->bottom)
  86     {
  87         lTmp = prcl->top;
  88         prcl->top = prcl->bottom;
  89         prcl->bottom = lTmp;
  90     }
  91 }
  92
  93 VOID
  94 FASTCALL
  95 RECTL_vInflateRect(RECTL *rect, INT dx, INT dy)
  96 {
  97     rect->left -= dx;
  98     rect->top -= dy;
  99     rect->right += dx;
 100     rect->bottom += dy;
 101 }
 102
 103 /* EOF */