windows/rect.c

   1 /*
   2  * Rectangle-related functions
   3  *
   4  * Copyright 1993, 1996 Alexandre Julliard
   5  *
   6  */
   7
   8 #include "windef.h"
   9 #include "wingdi.h"
  10 #include "wine/winuser16.h"
  11 #include "winuser.h"
  12
  13 /***********************************************************************
  14  *           SetRect16    (USER.72)
  15  */
  16 void WINAPI SetRect16( LPRECT16 rect, INT16 left, INT16 top,
  17                        INT16 right, INT16 bottom )
  18 {
  19     rect->left   = left;
  20     rect->right  = right;
  21     rect->top    = top;
  22     rect->bottom = bottom;
  23 }
  24
  25
  26 /***********************************************************************
  27  *           SetRect    (USER32.499)
  28  */
  29 BOOL WINAPI SetRect( LPRECT rect, INT left, INT top,
  30                        INT right, INT bottom )
  31 {
  32     rect->left   = left;
  33     rect->right  = right;
  34     rect->top    = top;
  35     rect->bottom = bottom;
  36     return TRUE;
  37 }
  38
  39
  40 /***********************************************************************
  41  *           SetRectEmpty16    (USER.73)
  42  */
  43 void WINAPI SetRectEmpty16( LPRECT16 rect )
  44 {
  45     rect->left = rect->right = rect->top = rect->bottom = 0;
  46 }
  47
  48
  49 /***********************************************************************
  50  *           SetRectEmpty    (USER32.500)
  51  */
  52 BOOL WINAPI SetRectEmpty( LPRECT rect )
  53 {
  54     rect->left = rect->right = rect->top = rect->bottom = 0;
  55     return TRUE;
  56 }
  57
  58
  59 /***********************************************************************
  60  *           CopyRect16    (USER.74)
  61  */
  62 BOOL16 WINAPI CopyRect16( RECT16 *dest, const RECT16 *src )
  63 {
  64     *dest = *src;
  65     return TRUE;
  66 }
  67
  68
  69 /***********************************************************************
  70  *           CopyRect    (USER32.62)
  71  */
  72 BOOL WINAPI CopyRect( RECT *dest, const RECT *src )
  73 {
  74     if (!dest || !src)
  75         return FALSE;
  76     *dest = *src;
  77     return TRUE;
  78 }
  79
  80
  81 /***********************************************************************
  82  *           IsRectEmpty16    (USER.75)
  83  *
  84  * Bug compat: Windows checks for 0 or negative width/height.
  85  */
  86 BOOL16 WINAPI IsRectEmpty16( const RECT16 *rect )
  87 {
  88     return ((rect->left >= rect->right) || (rect->top >= rect->bottom));
  89 }
  90
  91
  92 /***********************************************************************
  93  *           IsRectEmpty    (USER32.347)
  94  *
  95  * Bug compat: Windows checks for 0 or negative width/height.
  96  */
  97 BOOL WINAPI IsRectEmpty( const RECT *rect )
  98 {
  99     return ((rect->left >= rect->right) || (rect->top >= rect->bottom));
 100 }
 101
 102
 103 /***********************************************************************
 104  *           PtInRect16    (USER.76)
 105  */
 106 BOOL16 WINAPI PtInRect16( const RECT16 *rect, POINT16 pt )
 107 {
 108     return ((pt.x >= rect->left) && (pt.x < rect->right) &&
 109             (pt.y >= rect->top) && (pt.y < rect->bottom));
 110 }
 111
 112
 113 /***********************************************************************
 114  *           PtInRect    (USER32.424)
 115  */
 116 BOOL WINAPI PtInRect( const RECT *rect, POINT pt )
 117 {
 118     return ((pt.x >= rect->left) && (pt.x < rect->right) &&
 119             (pt.y >= rect->top) && (pt.y < rect->bottom));
 120 }
 121
 122
 123 /***********************************************************************
 124  *           OffsetRect16    (USER.77)
 125  */
 126 void WINAPI OffsetRect16( LPRECT16 rect, INT16 x, INT16 y )
 127 {
 128     rect->left   += x;
 129     rect->right  += x;
 130     rect->top    += y;
 131     rect->bottom += y;
 132 }
 133
 134
 135 /***********************************************************************
 136  *           OffsetRect    (USER32.406)
 137  */
 138 BOOL WINAPI OffsetRect( LPRECT rect, INT x, INT y )
 139 {
 140     rect->left   += x;
 141     rect->right  += x;
 142     rect->top    += y;
 143     rect->bottom += y;
 144     return TRUE;
 145 }
 146
 147
 148 /***********************************************************************
 149  *           InflateRect16    (USER.78)
 150  */
 151 void WINAPI InflateRect16( LPRECT16 rect, INT16 x, INT16 y )
 152 {
 153     rect->left   -= x;
 154     rect->top    -= y;
 155     rect->right  += x;
 156     rect->bottom += y;
 157 }
 158
 159
 160 /***********************************************************************
 161  *           InflateRect    (USER32.321)
 162  */
 163 BOOL WINAPI InflateRect( LPRECT rect, INT x, INT y )
 164 {
 165     rect->left   -= x;
 166     rect->top    -= y;
 167     rect->right  += x;
 168     rect->bottom += y;
 169     return TRUE;
 170 }
 171
 172
 173 /***********************************************************************
 174  *           IntersectRect16    (USER.79)
 175  */
 176 BOOL16 WINAPI IntersectRect16( LPRECT16 dest, const RECT16 *src1,
 177                                const RECT16 *src2 )
 178 {
 179     if (IsRectEmpty16(src1) || IsRectEmpty16(src2) ||
 180         (src1->left >= src2->right) || (src2->left >= src1->right) ||
 181         (src1->top >= src2->bottom) || (src2->top >= src1->bottom))
 182     {
 183         SetRectEmpty16( dest );
 184         return FALSE;
 185     }
 186     dest->left   = max( src1->left, src2->left );
 187     dest->right  = min( src1->right, src2->right );
 188     dest->top    = max( src1->top, src2->top );
 189     dest->bottom = min( src1->bottom, src2->bottom );
 190     return TRUE;
 191 }
 192
 193
 194 /***********************************************************************
 195  *           IntersectRect    (USER32.327)
 196  */
 197 BOOL WINAPI IntersectRect( LPRECT dest, const RECT *src1,
 198                                const RECT *src2 )
 199 {
 200     if (IsRectEmpty(src1) || IsRectEmpty(src2) ||
 201         (src1->left >= src2->right) || (src2->left >= src1->right) ||
 202         (src1->top >= src2->bottom) || (src2->top >= src1->bottom))
 203     {
 204         SetRectEmpty( dest );
 205         return FALSE;
 206     }
 207     dest->left   = max( src1->left, src2->left );
 208     dest->right  = min( src1->right, src2->right );
 209     dest->top    = max( src1->top, src2->top );
 210     dest->bottom = min( src1->bottom, src2->bottom );
 211     return TRUE;
 212 }
 213
 214
 215 /***********************************************************************
 216  *           UnionRect16    (USER.80)
 217  */
 218 BOOL16 WINAPI UnionRect16( LPRECT16 dest, const RECT16 *src1,
 219                            const RECT16 *src2 )
 220 {
 221     if (IsRectEmpty16(src1))
 222     {
 223         if (IsRectEmpty16(src2))
 224         {
 225             SetRectEmpty16( dest );
 226             return FALSE;
 227         }
 228         else *dest = *src2;
 229     }
 230     else
 231     {
 232         if (IsRectEmpty16(src2)) *dest = *src1;
 233         else
 234         {
 235             dest->left   = min( src1->left, src2->left );
 236             dest->right  = max( src1->right, src2->right );
 237             dest->top    = min( src1->top, src2->top );
 238             dest->bottom = max( src1->bottom, src2->bottom );
 239         }
 240     }
 241     return TRUE;
 242 }
 243
 244
 245 /***********************************************************************
 246  *           UnionRect    (USER32.559)
 247  */
 248 BOOL WINAPI UnionRect( LPRECT dest, const RECT *src1,
 249                            const RECT *src2 )
 250 {
 251     if (IsRectEmpty(src1))
 252     {
 253         if (IsRectEmpty(src2))
 254         {
 255             SetRectEmpty( dest );
 256             return FALSE;
 257         }
 258         else *dest = *src2;
 259     }
 260     else
 261     {
 262         if (IsRectEmpty(src2)) *dest = *src1;
 263         else
 264         {
 265             dest->left   = min( src1->left, src2->left );
 266             dest->right  = max( src1->right, src2->right );
 267             dest->top    = min( src1->top, src2->top );
 268             dest->bottom = max( src1->bottom, src2->bottom );
 269         }
 270     }
 271     return TRUE;
 272 }
 273
 274
 275 /***********************************************************************
 276  *           EqualRect16    (USER.244)
 277  */
 278 BOOL16 WINAPI EqualRect16( const RECT16* rect1, const RECT16* rect2 )
 279 {
 280     return ((rect1->left == rect2->left) && (rect1->right == rect2->right) &&
 281             (rect1->top == rect2->top) && (rect1->bottom == rect2->bottom));
 282 }
 283
 284
 285 /***********************************************************************
 286  *           EqualRect    (USER32.194)
 287  */
 288 BOOL WINAPI EqualRect( const RECT* rect1, const RECT* rect2 )
 289 {
 290     return ((rect1->left == rect2->left) && (rect1->right == rect2->right) &&
 291             (rect1->top == rect2->top) && (rect1->bottom == rect2->bottom));
 292 }
 293
 294
 295 /***********************************************************************
 296  *           SubtractRect16    (USER.373)
 297  */
 298 BOOL16 WINAPI SubtractRect16( LPRECT16 dest, const RECT16 *src1,
 299                               const RECT16 *src2 )
 300 {
 301     RECT16 tmp;
 302
 303     if (IsRectEmpty16( src1 ))
 304     {
 305         SetRectEmpty16( dest );
 306         return FALSE;
 307     }
 308     *dest = *src1;
 309     if (IntersectRect16( &tmp, src1, src2 ))
 310     {
 311         if (EqualRect16( &tmp, dest ))
 312         {
 313             SetRectEmpty16( dest );
 314             return FALSE;
 315         }
 316         if ((tmp.top == dest->top) && (tmp.bottom == dest->bottom))
 317         {
 318             if (tmp.left == dest->left) dest->left = tmp.right;
 319             else if (tmp.right == dest->right) dest->right = tmp.left;
 320         }
 321         else if ((tmp.left == dest->left) && (tmp.right == dest->right))
 322         {
 323             if (tmp.top == dest->top) dest->top = tmp.bottom;
 324             else if (tmp.bottom == dest->bottom) dest->bottom = tmp.top;
 325         }
 326     }
 327     return TRUE;
 328 }
 329
 330
 331 /***********************************************************************
 332  *           SubtractRect    (USER32.536)
 333  */
 334 BOOL WINAPI SubtractRect( LPRECT dest, const RECT *src1,
 335                               const RECT *src2 )
 336 {
 337     RECT tmp;
 338
 339     if (IsRectEmpty( src1 ))
 340     {
 341         SetRectEmpty( dest );
 342         return FALSE;
 343     }
 344     *dest = *src1;
 345     if (IntersectRect( &tmp, src1, src2 ))
 346     {
 347         if (EqualRect( &tmp, dest ))
 348         {
 349             SetRectEmpty( dest );
 350             return FALSE;
 351         }
 352         if ((tmp.top == dest->top) && (tmp.bottom == dest->bottom))
 353         {
 354             if (tmp.left == dest->left) dest->left = tmp.right;
 355             else if (tmp.right == dest->right) dest->right = tmp.left;
 356         }
 357         else if ((tmp.left == dest->left) && (tmp.right == dest->right))
 358         {
 359             if (tmp.top == dest->top) dest->top = tmp.bottom;
 360             else if (tmp.bottom == dest->bottom) dest->bottom = tmp.top;
 361         }
 362     }
 363     return TRUE;
 364 }