dlls/user32/tests/dce.c

   1 /*
   2  * Unit tests for DCE support
   3  *
   4  * Copyright 2005 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <assert.h>
  22 #include <stdlib.h>
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "wingdi.h"
  29 #include "winuser.h"
  30
  31 #include "wine/test.h"
  32
  33 #ifndef DCX_USESTYLE
  34 #define DCX_USESTYLE         0x00010000
  35 #endif
  36
  37 static HWND hwnd_cache, hwnd_owndc, hwnd_classdc, hwnd_classdc2;
  38
  39 /* test behavior of DC attributes with various GetDC/ReleaseDC combinations */
  40 static void test_dc_attributes(void)
  41 {
  42     HDC hdc, old_hdc;
  43     INT rop, def_rop;
  44
  45     /* test cache DC */
  46
  47     hdc = GetDC( hwnd_cache );
  48     def_rop = GetROP2( hdc );
  49
  50     SetROP2( hdc, R2_WHITE );
  51     rop = GetROP2( hdc );
  52     ok( rop == R2_WHITE, "wrong ROP2 %d\n", rop );
  53
  54     ReleaseDC( hwnd_cache, hdc );
  55     hdc = GetDC( hwnd_cache );
  56     rop = GetROP2( hdc );
  57     ok( rop == def_rop, "wrong ROP2 %d after release\n", rop );
  58     SetROP2( hdc, R2_WHITE );
  59     ReleaseDC( hwnd_cache, hdc );
  60
  61     hdc = GetDCEx( hwnd_cache, 0, DCX_USESTYLE | DCX_NORESETATTRS );
  62     rop = GetROP2( hdc );
  63     /* Win9x seems to silently ignore DCX_NORESETATTRS */
  64     ok( rop == def_rop || rop == R2_WHITE, "wrong ROP2 %d\n", rop );
  65
  66     SetROP2( hdc, R2_WHITE );
  67     rop = GetROP2( hdc );
  68     ok( rop == R2_WHITE, "wrong ROP2 %d\n", rop );
  69
  70     ReleaseDC( hwnd_cache, hdc );
  71     hdc = GetDCEx( hwnd_cache, 0, DCX_USESTYLE | DCX_NORESETATTRS );
  72     rop = GetROP2( hdc );
  73     ok( rop == def_rop || rop == R2_WHITE, "wrong ROP2 %d after release\n", rop );
  74     ReleaseDC( hwnd_cache, hdc );
  75
  76     hdc = GetDCEx( hwnd_cache, 0, DCX_USESTYLE );
  77     rop = GetROP2( hdc );
  78     ok( rop == def_rop, "wrong ROP2 %d after release\n", rop );
  79     ReleaseDC( hwnd_cache, hdc );
  80
  81     /* test own DC */
  82
  83     hdc = GetDC( hwnd_owndc );
  84     SetROP2( hdc, R2_WHITE );
  85     rop = GetROP2( hdc );
  86     ok( rop == R2_WHITE, "wrong ROP2 %d\n", rop );
  87
  88     old_hdc = hdc;
  89     ReleaseDC( hwnd_owndc, hdc );
  90     hdc = GetDC( hwnd_owndc );
  91     ok( old_hdc == hdc, "didn't get same DC %p/%p\n", old_hdc, hdc );
  92     rop = GetROP2( hdc );
  93     ok( rop == R2_WHITE, "wrong ROP2 %d after release\n", rop );
  94     ReleaseDC( hwnd_owndc, hdc );
  95     rop = GetROP2( hdc );
  96     ok( rop == R2_WHITE, "wrong ROP2 %d after second release\n", rop );
  97
  98     /* test class DC */
  99
 100     hdc = GetDC( hwnd_classdc );
 101     SetROP2( hdc, R2_WHITE );
 102     rop = GetROP2( hdc );
 103     ok( rop == R2_WHITE, "wrong ROP2 %d\n", rop );
 104
 105     old_hdc = hdc;
 106     ReleaseDC( hwnd_classdc, hdc );
 107     hdc = GetDC( hwnd_classdc );
 108     ok( old_hdc == hdc, "didn't get same DC %p/%p\n", old_hdc, hdc );
 109     rop = GetROP2( hdc );
 110     ok( rop == R2_WHITE, "wrong ROP2 %d after release\n", rop );
 111     ReleaseDC( hwnd_classdc, hdc );
 112     rop = GetROP2( hdc );
 113     ok( rop == R2_WHITE, "wrong ROP2 %d after second release\n", rop );
 114
 115     /* test class DC with 2 windows */
 116
 117     old_hdc = GetDC( hwnd_classdc );
 118     SetROP2( old_hdc, R2_BLACK );
 119     hdc = GetDC( hwnd_classdc2 );
 120     ok( old_hdc == hdc, "didn't get same DC %p/%p\n", old_hdc, hdc );
 121     rop = GetROP2( hdc );
 122     ok( rop == R2_BLACK, "wrong ROP2 %d for other window\n", rop );
 123     ReleaseDC( hwnd_classdc, old_hdc );
 124     ReleaseDC( hwnd_classdc, hdc );
 125     rop = GetROP2( hdc );
 126     ok( rop == R2_BLACK, "wrong ROP2 %d after release\n", rop );
 127 }
 128
 129
 130 /* test behavior with various invalid parameters */
 131 static void test_parameters(void)
 132 {
 133     HDC hdc;
 134
 135     hdc = GetDC( hwnd_cache );
 136     ok( ReleaseDC( hwnd_owndc, hdc ), "ReleaseDC with wrong window should succeed\n" );
 137
 138     hdc = GetDC( hwnd_cache );
 139     ok( !ReleaseDC( hwnd_cache, 0 ), "ReleaseDC with wrong HDC should fail\n" );
 140     ok( ReleaseDC( hwnd_cache, hdc ), "correct ReleaseDC should succeed\n" );
 141     ok( !ReleaseDC( hwnd_cache, hdc ), "second ReleaseDC should fail\n" );
 142
 143     hdc = GetDC( hwnd_owndc );
 144     ok( ReleaseDC( hwnd_cache, hdc ), "ReleaseDC with wrong window should succeed\n" );
 145     hdc = GetDC( hwnd_owndc );
 146     ok( ReleaseDC( hwnd_owndc, hdc ), "correct ReleaseDC should succeed\n" );
 147     ok( ReleaseDC( hwnd_owndc, hdc ), "second ReleaseDC should succeed\n" );
 148
 149     hdc = GetDC( hwnd_classdc );
 150     ok( ReleaseDC( hwnd_cache, hdc ), "ReleaseDC with wrong window should succeed\n" );
 151     hdc = GetDC( hwnd_classdc );
 152     ok( ReleaseDC( hwnd_classdc, hdc ), "correct ReleaseDC should succeed\n" );
 153     ok( ReleaseDC( hwnd_classdc, hdc ), "second ReleaseDC should succeed\n" );
 154 }
 155
 156
 157 static void test_dc_visrgn(void)
 158 {
 159     HDC old_hdc, hdc;
 160     HRGN hrgn, hrgn2;
 161     RECT rect;
 162
 163     /* cache DC */
 164
 165     SetRect( &rect, 10, 10, 20, 20 );
 166     MapWindowPoints( hwnd_cache, 0, (POINT *)&rect, 2 );
 167     hrgn = CreateRectRgnIndirect( &rect );
 168     hdc = GetDCEx( hwnd_cache, hrgn, DCX_INTERSECTRGN | DCX_USESTYLE );
 169     SetRectEmpty( &rect );
 170     GetClipBox( hdc, &rect );
 171     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 172         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 173     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 174     ReleaseDC( hwnd_cache, hdc );
 175     ok( GetRgnBox( hrgn, &rect ) == ERROR, "region must no longer be valid\n" );
 176
 177     /* cache DC with NORESETATTRS */
 178
 179     SetRect( &rect, 10, 10, 20, 20 );
 180     MapWindowPoints( hwnd_cache, 0, (POINT *)&rect, 2 );
 181     hrgn = CreateRectRgnIndirect( &rect );
 182     hdc = GetDCEx( hwnd_cache, hrgn, DCX_INTERSECTRGN | DCX_USESTYLE | DCX_NORESETATTRS );
 183     SetRectEmpty( &rect );
 184     GetClipBox( hdc, &rect );
 185     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 186         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 187     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 188     ReleaseDC( hwnd_cache, hdc );
 189     ok( GetRgnBox( hrgn, &rect ) == ERROR, "region must no longer be valid\n" );
 190     hdc = GetDCEx( hwnd_cache, 0, DCX_USESTYLE | DCX_NORESETATTRS );
 191     SetRectEmpty( &rect );
 192     GetClipBox( hdc, &rect );
 193     ok( !(rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20),
 194         "clip box sould have been reset %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 195     ReleaseDC( hwnd_cache, hdc );
 196
 197     /* window DC */
 198
 199     SetRect( &rect, 10, 10, 20, 20 );
 200     MapWindowPoints( hwnd_owndc, 0, (POINT *)&rect, 2 );
 201     hrgn = CreateRectRgnIndirect( &rect );
 202     hdc = GetDCEx( hwnd_owndc, hrgn, DCX_INTERSECTRGN | DCX_USESTYLE );
 203     SetRectEmpty( &rect );
 204     GetClipBox( hdc, &rect );
 205     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 206         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 207     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 208     ReleaseDC( hwnd_owndc, hdc );
 209     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 210     SetRectEmpty( &rect );
 211     GetClipBox( hdc, &rect );
 212     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 213         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 214     hdc = GetDCEx( hwnd_owndc, 0, DCX_USESTYLE );
 215     SetRectEmpty( &rect );
 216     GetClipBox( hdc, &rect );
 217     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 218         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 219     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 220     ReleaseDC( hwnd_owndc, hdc );
 221     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 222
 223     SetRect( &rect, 20, 20, 30, 30 );
 224     MapWindowPoints( hwnd_owndc, 0, (POINT *)&rect, 2 );
 225     hrgn2 = CreateRectRgnIndirect( &rect );
 226     hdc = GetDCEx( hwnd_owndc, hrgn2, DCX_INTERSECTRGN | DCX_USESTYLE );
 227     ok( GetRgnBox( hrgn, &rect ) == ERROR, "region must no longer be valid\n" );
 228     SetRectEmpty( &rect );
 229     GetClipBox( hdc, &rect );
 230     ok( rect.left >= 20 && rect.top >= 20 && rect.right <= 30 && rect.bottom <= 30,
 231         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 232     ok( GetRgnBox( hrgn2, &rect ) != ERROR, "region2 must still be valid\n" );
 233     ReleaseDC( hwnd_owndc, hdc );
 234     ok( GetRgnBox( hrgn2, &rect ) != ERROR, "region2 must still be valid\n" );
 235     hdc = GetDCEx( hwnd_owndc, 0, DCX_EXCLUDERGN | DCX_USESTYLE );
 236     ok( GetRgnBox( hrgn2, &rect ) == ERROR, "region must no longer be valid\n" );
 237     SetRectEmpty( &rect );
 238     GetClipBox( hdc, &rect );
 239     ok( !(rect.left >= 20 && rect.top >= 20 && rect.right <= 30 && rect.bottom <= 30),
 240         "clip box should have been reset %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 241     ReleaseDC( hwnd_owndc, hdc );
 242
 243     /* class DC */
 244
 245     SetRect( &rect, 10, 10, 20, 20 );
 246     MapWindowPoints( hwnd_classdc, 0, (POINT *)&rect, 2 );
 247     hrgn = CreateRectRgnIndirect( &rect );
 248     hdc = GetDCEx( hwnd_classdc, hrgn, DCX_INTERSECTRGN | DCX_USESTYLE );
 249     SetRectEmpty( &rect );
 250     GetClipBox( hdc, &rect );
 251     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 252         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 253     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 254     ReleaseDC( hwnd_classdc, hdc );
 255     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 256     SetRectEmpty( &rect );
 257     GetClipBox( hdc, &rect );
 258     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 259         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 260
 261     hdc = GetDCEx( hwnd_classdc, 0, DCX_USESTYLE );
 262     SetRectEmpty( &rect );
 263     GetClipBox( hdc, &rect );
 264     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 265         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 266     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 267     ReleaseDC( hwnd_classdc, hdc );
 268     ok( GetRgnBox( hrgn, &rect ) != ERROR, "region must still be valid\n" );
 269
 270     SetRect( &rect, 20, 20, 30, 30 );
 271     MapWindowPoints( hwnd_classdc, 0, (POINT *)&rect, 2 );
 272     hrgn2 = CreateRectRgnIndirect( &rect );
 273     hdc = GetDCEx( hwnd_classdc, hrgn2, DCX_INTERSECTRGN | DCX_USESTYLE );
 274     ok( GetRgnBox( hrgn, &rect ) == ERROR, "region must no longer be valid\n" );
 275     SetRectEmpty( &rect );
 276     GetClipBox( hdc, &rect );
 277     ok( rect.left >= 20 && rect.top >= 20 && rect.right <= 30 && rect.bottom <= 30,
 278         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 279     ok( GetRgnBox( hrgn2, &rect ) != ERROR, "region2 must still be valid\n" );
 280
 281     old_hdc = hdc;
 282     hdc = GetDCEx( hwnd_classdc2, 0, DCX_USESTYLE );
 283     ok( old_hdc == hdc, "did not get the same hdc %p/%p\n", old_hdc, hdc );
 284     ok( GetRgnBox( hrgn2, &rect ) != ERROR, "region2 must still be valid\n" );
 285     SetRectEmpty( &rect );
 286     GetClipBox( hdc, &rect );
 287     ok( !(rect.left >= 20 && rect.top >= 20 && rect.right <= 30 && rect.bottom <= 30),
 288         "clip box should have been reset %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 289     ReleaseDC( hwnd_classdc2, hdc );
 290     ok( GetRgnBox( hrgn2, &rect ) != ERROR, "region2 must still be valid\n" );
 291     hdc = GetDCEx( hwnd_classdc2, 0, DCX_EXCLUDERGN | DCX_USESTYLE );
 292     ok( GetRgnBox( hrgn2, &rect ) != ERROR, "region2 must still be valid\n" );
 293     ok( !(rect.left >= 20 && rect.top >= 20 && rect.right <= 30 && rect.bottom <= 30),
 294         "clip box must have been reset %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 295     ReleaseDC( hwnd_classdc2, hdc );
 296 }
 297
 298
 299 /* test various BeginPaint/EndPaint behaviors */
 300 static void test_begin_paint(void)
 301 {
 302     HDC old_hdc, hdc;
 303     RECT rect;
 304     PAINTSTRUCT ps;
 305
 306     /* cache DC */
 307
 308     /* clear update region */
 309     RedrawWindow( hwnd_cache, NULL, 0, RDW_VALIDATE|RDW_NOFRAME|RDW_NOERASE );
 310     SetRect( &rect, 10, 10, 20, 20 );
 311     RedrawWindow( hwnd_cache, &rect, 0, RDW_INVALIDATE );
 312     hdc = BeginPaint( hwnd_cache, &ps );
 313     SetRectEmpty( &rect );
 314     GetClipBox( hdc, &rect );
 315     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 316         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 317     EndPaint( hwnd_cache, &ps );
 318
 319     /* window DC */
 320
 321     RedrawWindow( hwnd_owndc, NULL, 0, RDW_VALIDATE|RDW_NOFRAME|RDW_NOERASE );
 322     SetRect( &rect, 10, 10, 20, 20 );
 323     RedrawWindow( hwnd_owndc, &rect, 0, RDW_INVALIDATE );
 324     hdc = BeginPaint( hwnd_owndc, &ps );
 325     SetRectEmpty( &rect );
 326     GetClipBox( hdc, &rect );
 327     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 328         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 329     ReleaseDC( hwnd_owndc, hdc );
 330     SetRectEmpty( &rect );
 331     GetClipBox( hdc, &rect );
 332     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 333         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 334     ok( GetDC( hwnd_owndc ) == hdc, "got different hdc\n" );
 335     SetRectEmpty( &rect );
 336     GetClipBox( hdc, &rect );
 337     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 338         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 339     EndPaint( hwnd_owndc, &ps );
 340     SetRectEmpty( &rect );
 341     GetClipBox( hdc, &rect );
 342     ok( !(rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20),
 343         "clip box should have been reset %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 344     RedrawWindow( hwnd_owndc, NULL, 0, RDW_VALIDATE|RDW_NOFRAME|RDW_NOERASE );
 345     SetRect( &rect, 10, 10, 20, 20 );
 346     RedrawWindow( hwnd_owndc, &rect, 0, RDW_INVALIDATE|RDW_ERASE );
 347     ok( GetDC( hwnd_owndc ) == hdc, "got different hdc\n" );
 348     SetRectEmpty( &rect );
 349     GetClipBox( hdc, &rect );
 350     ok( !(rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20),
 351         "clip box should be the whole window %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 352     RedrawWindow( hwnd_owndc, NULL, 0, RDW_ERASENOW );
 353     SetRectEmpty( &rect );
 354     GetClipBox( hdc, &rect );
 355     ok( !(rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20),
 356         "clip box should still be the whole window %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 357
 358     /* class DC */
 359
 360     RedrawWindow( hwnd_classdc, NULL, 0, RDW_VALIDATE|RDW_NOFRAME|RDW_NOERASE );
 361     SetRect( &rect, 10, 10, 20, 20 );
 362     RedrawWindow( hwnd_classdc, &rect, 0, RDW_INVALIDATE );
 363     hdc = BeginPaint( hwnd_classdc, &ps );
 364     SetRectEmpty( &rect );
 365     GetClipBox( hdc, &rect );
 366     ok( rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20,
 367         "invalid clip box %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 368
 369     old_hdc = hdc;
 370     hdc = GetDC( hwnd_classdc2 );
 371     ok( old_hdc == hdc, "did not get the same hdc %p/%p\n", old_hdc, hdc );
 372     SetRectEmpty( &rect );
 373     GetClipBox( hdc, &rect );
 374     ok( !(rect.left >= 10 && rect.top >= 10 && rect.right <= 20 && rect.bottom <= 20),
 375         "clip box should have been reset %d,%d-%d,%d\n", rect.left, rect.top, rect.right, rect.bottom );
 376 }
 377
 378 static void test_invisible_create(void)
 379 {
 380     HWND hwnd_owndc = CreateWindowA("owndc_class", NULL, WS_OVERLAPPED,
 381                                     0, 200, 100, 100,
 382                                     0, 0, GetModuleHandleA(0), NULL );
 383     HDC dc1, dc2;
 384
 385     dc1 = GetDC(hwnd_owndc);
 386     dc2 = GetDC(hwnd_owndc);
 387
 388     ok(dc1 == dc2, "expected owndc dcs to match\n");
 389
 390     ReleaseDC(hwnd_owndc, dc2);
 391     ReleaseDC(hwnd_owndc, dc1);
 392     DestroyWindow(hwnd_owndc);
 393 }
 394
 395 START_TEST(dce)
 396 {
 397     WNDCLASSA cls;
 398
 399     cls.style = CS_DBLCLKS;
 400     cls.lpfnWndProc = DefWindowProcA;
 401     cls.cbClsExtra = 0;
 402     cls.cbWndExtra = 0;
 403     cls.hInstance = GetModuleHandleA(0);
 404     cls.hIcon = 0;
 405     cls.hCursor = LoadCursorA(0, IDC_ARROW);
 406     cls.hbrBackground = GetStockObject(WHITE_BRUSH);
 407     cls.lpszMenuName = NULL;
 408     cls.lpszClassName = "cache_class";
 409     RegisterClassA(&cls);
 410     cls.style = CS_DBLCLKS | CS_OWNDC;
 411     cls.lpszClassName = "owndc_class";
 412     RegisterClassA(&cls);
 413     cls.style = CS_DBLCLKS | CS_CLASSDC;
 414     cls.lpszClassName = "classdc_class";
 415     RegisterClassA(&cls);
 416
 417     hwnd_cache = CreateWindowA("cache_class", NULL, WS_OVERLAPPED | WS_VISIBLE,
 418                                0, 0, 100, 100,
 419                                0, 0, GetModuleHandleA(0), NULL );
 420     hwnd_owndc = CreateWindowA("owndc_class", NULL, WS_OVERLAPPED | WS_VISIBLE,
 421                                0, 200, 100, 100,
 422                                0, 0, GetModuleHandleA(0), NULL );
 423     hwnd_classdc = CreateWindowA("classdc_class", NULL, WS_OVERLAPPED | WS_VISIBLE,
 424                                  200, 0, 100, 100,
 425                                  0, 0, GetModuleHandleA(0), NULL );
 426     hwnd_classdc2 = CreateWindowA("classdc_class", NULL, WS_OVERLAPPED | WS_VISIBLE,
 427                                   200, 200, 100, 100,
 428                                   0, 0, GetModuleHandleA(0), NULL );
 429     test_dc_attributes();
 430     test_parameters();
 431     test_dc_visrgn();
 432     test_begin_paint();
 433     test_invisible_create();
 434 }