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