windows/rect.c

   1 /*
   2  * Rectangle-related functions
   3  *
   4  * Copyright 1993, 1996 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <stdarg.h>
  22
  23 #include "windef.h"
  24 #include "winbase.h"
  25 #include "wingdi.h"
  26 #include "wine/winuser16.h"
  27 #include "winuser.h"
  28
  29 /***********************************************************************
  30  *              SetRect (USER.72)
  31  */
  32 void WINAPI SetRect16( LPRECT16 rect, INT16 left, INT16 top,
  33                        INT16 right, INT16 bottom )
  34 {
  35     rect->left   = left;
  36     rect->right  = right;
  37     rect->top    = top;
  38     rect->bottom = bottom;
  39 }
  40
  41
  42 /***********************************************************************
  43  *              SetRect (USER32.@)
  44  */
  45 BOOL WINAPI SetRect( LPRECT rect, INT left, INT top,
  46                        INT right, INT bottom )
  47 {
  48     if (!rect) return FALSE;
  49     rect->left   = left;
  50     rect->right  = right;
  51     rect->top    = top;
  52     rect->bottom = bottom;
  53     return TRUE;
  54 }
  55
  56
  57 /***********************************************************************
  58  *              SetRectEmpty (USER.73)
  59  */
  60 void WINAPI SetRectEmpty16( LPRECT16 rect )
  61 {
  62     rect->left = rect->right = rect->top = rect->bottom = 0;
  63 }
  64
  65
  66 /***********************************************************************
  67  *              SetRectEmpty (USER32.@)
  68  */
  69 BOOL WINAPI SetRectEmpty( LPRECT rect )
  70 {
  71     if (!rect) return FALSE;
  72     rect->left = rect->right = rect->top = rect->bottom = 0;
  73     return TRUE;
  74 }
  75
  76
  77 /***********************************************************************
  78  *              CopyRect (USER.74)
  79  */
  80 BOOL16 WINAPI CopyRect16( RECT16 *dest, const RECT16 *src )
  81 {
  82     *dest = *src;
  83     return TRUE;
  84 }
  85
  86
  87 /***********************************************************************
  88  *              CopyRect (USER32.@)
  89  */
  90 BOOL WINAPI CopyRect( RECT *dest, const RECT *src )
  91 {
  92     if (!dest || !src)
  93         return FALSE;
  94     *dest = *src;
  95     return TRUE;
  96 }
  97
  98
  99 /***********************************************************************
 100  *              IsRectEmpty (USER.75)
 101  *
 102  * Bug compat: Windows checks for 0 or negative width/height.
 103  */
 104 BOOL16 WINAPI IsRectEmpty16( const RECT16 *rect )
 105 {
 106     return ((rect->left >= rect->right) || (rect->top >= rect->bottom));
 107 }
 108
 109
 110 /***********************************************************************
 111  *              IsRectEmpty (USER32.@)
 112  *
 113  * Bug compat: Windows checks for 0 or negative width/height.
 114  */
 115 BOOL WINAPI IsRectEmpty( const RECT *rect )
 116 {
 117     if (!rect) return TRUE;
 118     return ((rect->left >= rect->right) || (rect->top >= rect->bottom));
 119 }
 120
 121
 122 /***********************************************************************
 123  *              PtInRect (USER.76)
 124  */
 125 BOOL16 WINAPI PtInRect16( const RECT16 *rect, POINT16 pt )
 126 {
 127     return ((pt.x >= rect->left) && (pt.x < rect->right) &&
 128             (pt.y >= rect->top) && (pt.y < rect->bottom));
 129 }
 130
 131
 132 /***********************************************************************
 133  *              PtInRect (USER32.@)
 134  */
 135 BOOL WINAPI PtInRect( const RECT *rect, POINT pt )
 136 {
 137     if (!rect) return FALSE;
 138     return ((pt.x >= rect->left) && (pt.x < rect->right) &&
 139             (pt.y >= rect->top) && (pt.y < rect->bottom));
 140 }
 141
 142
 143 /***********************************************************************
 144  *              OffsetRect (USER.77)
 145  */
 146 void WINAPI OffsetRect16( LPRECT16 rect, INT16 x, INT16 y )
 147 {
 148     rect->left   += x;
 149     rect->right  += x;
 150     rect->top    += y;
 151     rect->bottom += y;
 152 }
 153
 154
 155 /***********************************************************************
 156  *              OffsetRect (USER32.@)
 157  */
 158 BOOL WINAPI OffsetRect( LPRECT rect, INT x, INT y )
 159 {
 160     if (!rect) return FALSE;
 161     rect->left   += x;
 162     rect->right  += x;
 163     rect->top    += y;
 164     rect->bottom += y;
 165     return TRUE;
 166 }
 167
 168
 169 /***********************************************************************
 170  *              InflateRect (USER.78)
 171  */
 172 void WINAPI InflateRect16( LPRECT16 rect, INT16 x, INT16 y )
 173 {
 174     rect->left   -= x;
 175     rect->top    -= y;
 176     rect->right  += x;
 177     rect->bottom += y;
 178 }
 179
 180
 181 /***********************************************************************
 182  *              InflateRect (USER32.@)
 183  */
 184 BOOL WINAPI InflateRect( LPRECT rect, INT x, INT y )
 185 {
 186     if (!rect) return FALSE;
 187     rect->left   -= x;
 188     rect->top    -= y;
 189     rect->right  += x;
 190     rect->bottom += y;
 191     return TRUE;
 192 }
 193
 194
 195 /***********************************************************************
 196  *              IntersectRect (USER.79)
 197  */
 198 BOOL16 WINAPI IntersectRect16( LPRECT16 dest, const RECT16 *src1,
 199                                const RECT16 *src2 )
 200 {
 201     if (IsRectEmpty16(src1) || IsRectEmpty16(src2) ||
 202         (src1->left >= src2->right) || (src2->left >= src1->right) ||
 203         (src1->top >= src2->bottom) || (src2->top >= src1->bottom))
 204     {
 205         SetRectEmpty16( dest );
 206         return FALSE;
 207     }
 208     dest->left   = max( src1->left, src2->left );
 209     dest->right  = min( src1->right, src2->right );
 210     dest->top    = max( src1->top, src2->top );
 211     dest->bottom = min( src1->bottom, src2->bottom );
 212     return TRUE;
 213 }
 214
 215
 216 /***********************************************************************
 217  *              IntersectRect (USER32.@)
 218  */
 219 BOOL WINAPI IntersectRect( LPRECT dest, const RECT *src1,
 220                                const RECT *src2 )
 221 {
 222     if (!dest || !src1 || !src2) return FALSE;
 223     if (IsRectEmpty(src1) || IsRectEmpty(src2) ||
 224         (src1->left >= src2->right) || (src2->left >= src1->right) ||
 225         (src1->top >= src2->bottom) || (src2->top >= src1->bottom))
 226     {
 227         SetRectEmpty( dest );
 228         return FALSE;
 229     }
 230     dest->left   = max( src1->left, src2->left );
 231     dest->right  = min( src1->right, src2->right );
 232     dest->top    = max( src1->top, src2->top );
 233     dest->bottom = min( src1->bottom, src2->bottom );
 234     return TRUE;
 235 }
 236
 237
 238 /***********************************************************************
 239  *              UnionRect (USER.80)
 240  */
 241 BOOL16 WINAPI UnionRect16( LPRECT16 dest, const RECT16 *src1,
 242                            const RECT16 *src2 )
 243 {
 244     if (IsRectEmpty16(src1))
 245     {
 246         if (IsRectEmpty16(src2))
 247         {
 248             SetRectEmpty16( dest );
 249             return FALSE;
 250         }
 251         else *dest = *src2;
 252     }
 253     else
 254     {
 255         if (IsRectEmpty16(src2)) *dest = *src1;
 256         else
 257         {
 258             dest->left   = min( src1->left, src2->left );
 259             dest->right  = max( src1->right, src2->right );
 260             dest->top    = min( src1->top, src2->top );
 261             dest->bottom = max( src1->bottom, src2->bottom );
 262         }
 263     }
 264     return TRUE;
 265 }
 266
 267
 268 /***********************************************************************
 269  *              UnionRect (USER32.@)
 270  */
 271 BOOL WINAPI UnionRect( LPRECT dest, const RECT *src1,
 272                            const RECT *src2 )
 273 {
 274     if (!dest) return FALSE;
 275     if (IsRectEmpty(src1))
 276     {
 277         if (IsRectEmpty(src2))
 278         {
 279             SetRectEmpty( dest );
 280             return FALSE;
 281         }
 282         else *dest = *src2;
 283     }
 284     else
 285     {
 286         if (IsRectEmpty(src2)) *dest = *src1;
 287         else
 288         {
 289             dest->left   = min( src1->left, src2->left );
 290             dest->right  = max( src1->right, src2->right );
 291             dest->top    = min( src1->top, src2->top );
 292             dest->bottom = max( src1->bottom, src2->bottom );
 293         }
 294     }
 295     return TRUE;
 296 }
 297
 298
 299 /***********************************************************************
 300  *              EqualRect (USER.244)
 301  */
 302 BOOL16 WINAPI EqualRect16( const RECT16* rect1, const RECT16* rect2 )
 303 {
 304     return ((rect1->left == rect2->left) && (rect1->right == rect2->right) &&
 305             (rect1->top == rect2->top) && (rect1->bottom == rect2->bottom));
 306 }
 307
 308
 309 /***********************************************************************
 310  *              EqualRect (USER32.@)
 311  */
 312 BOOL WINAPI EqualRect( const RECT* rect1, const RECT* rect2 )
 313 {
 314     if (!rect1 || !rect2) return FALSE;
 315     return ((rect1->left == rect2->left) && (rect1->right == rect2->right) &&
 316             (rect1->top == rect2->top) && (rect1->bottom == rect2->bottom));
 317 }
 318
 319
 320 /***********************************************************************
 321  *              SubtractRect (USER.373)
 322  */
 323 BOOL16 WINAPI SubtractRect16( LPRECT16 dest, const RECT16 *src1,
 324                               const RECT16 *src2 )
 325 {
 326     RECT16 tmp;
 327
 328     if (IsRectEmpty16( src1 ))
 329     {
 330         SetRectEmpty16( dest );
 331         return FALSE;
 332     }
 333     *dest = *src1;
 334     if (IntersectRect16( &tmp, src1, src2 ))
 335     {
 336         if (EqualRect16( &tmp, dest ))
 337         {
 338             SetRectEmpty16( dest );
 339             return FALSE;
 340         }
 341         if ((tmp.top == dest->top) && (tmp.bottom == dest->bottom))
 342         {
 343             if (tmp.left == dest->left) dest->left = tmp.right;
 344             else if (tmp.right == dest->right) dest->right = tmp.left;
 345         }
 346         else if ((tmp.left == dest->left) && (tmp.right == dest->right))
 347         {
 348             if (tmp.top == dest->top) dest->top = tmp.bottom;
 349             else if (tmp.bottom == dest->bottom) dest->bottom = tmp.top;
 350         }
 351     }
 352     return TRUE;
 353 }
 354
 355
 356 /***********************************************************************
 357  *              SubtractRect (USER32.@)
 358  */
 359 BOOL WINAPI SubtractRect( LPRECT dest, const RECT *src1,
 360                               const RECT *src2 )
 361 {
 362     RECT tmp;
 363
 364     if (!dest) return FALSE;
 365     if (IsRectEmpty( src1 ))
 366     {
 367         SetRectEmpty( dest );
 368         return FALSE;
 369     }
 370     *dest = *src1;
 371     if (IntersectRect( &tmp, src1, src2 ))
 372     {
 373         if (EqualRect( &tmp, dest ))
 374         {
 375             SetRectEmpty( dest );
 376             return FALSE;
 377         }
 378         if ((tmp.top == dest->top) && (tmp.bottom == dest->bottom))
 379         {
 380             if (tmp.left == dest->left) dest->left = tmp.right;
 381             else if (tmp.right == dest->right) dest->right = tmp.left;
 382         }
 383         else if ((tmp.left == dest->left) && (tmp.right == dest->right))
 384         {
 385             if (tmp.top == dest->top) dest->top = tmp.bottom;
 386             else if (tmp.bottom == dest->bottom) dest->bottom = tmp.top;
 387         }
 388     }
 389     return TRUE;
 390 }