dlls/gdi32/palette.c

   1 /*
   2  * GDI palette objects
   3  *
   4  * Copyright 1993,1994 Alexandre Julliard
   5  * Copyright 1996 Alex Korobka
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * NOTES:
  22  * PALETTEOBJ is documented in the Dr. Dobbs Journal May 1993.
  23  * Information in the "Undocumented Windows" is incorrect.
  24  */
  25
  26 #include <stdarg.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "winerror.h"
  33 #include "wingdi.h"
  34 #include "winuser.h"
  35
  36 #include "gdi_private.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(palette);
  40
  41 typedef BOOL (*unrealize_function)(HPALETTE);
  42
  43 typedef struct tagPALETTEOBJ
  44 {
  45     GDIOBJHDR           header;
  46     unrealize_function  unrealize;
  47     WORD                version;    /* palette version */
  48     WORD                count;      /* count of palette entries */
  49     PALETTEENTRY       *entries;
  50 } PALETTEOBJ;
  51
  52 static INT PALETTE_GetObject( HGDIOBJ handle, INT count, LPVOID buffer );
  53 static BOOL PALETTE_UnrealizeObject( HGDIOBJ handle );
  54 static BOOL PALETTE_DeleteObject( HGDIOBJ handle );
  55
  56 static const struct gdi_obj_funcs palette_funcs =
  57 {
  58     NULL,                     /* pSelectObject */
  59     PALETTE_GetObject,        /* pGetObjectA */
  60     PALETTE_GetObject,        /* pGetObjectW */
  61     PALETTE_UnrealizeObject,  /* pUnrealizeObject */
  62     PALETTE_DeleteObject      /* pDeleteObject */
  63 };
  64
  65 /* Pointers to USER implementation of SelectPalette/RealizePalette */
  66 /* they will be patched by USER on startup */
  67 HPALETTE (WINAPI *pfnSelectPalette)(HDC hdc, HPALETTE hpal, WORD bkgnd ) = GDISelectPalette;
  68 UINT (WINAPI *pfnRealizePalette)(HDC hdc) = GDIRealizePalette;
  69
  70 static UINT SystemPaletteUse = SYSPAL_STATIC;  /* currently not considered */
  71
  72 static HPALETTE hPrimaryPalette = 0; /* used for WM_PALETTECHANGED */
  73 static HPALETTE hLastRealizedPalette = 0; /* UnrealizeObject() needs it */
  74
  75
  76 /***********************************************************************
  77  *           PALETTE_Init
  78  *
  79  * Create the system palette.
  80  */
  81 HPALETTE PALETTE_Init(void)
  82 {
  83     const RGBQUAD *entries = get_default_color_table( 8 );
  84     char buffer[FIELD_OFFSET( LOGPALETTE, palPalEntry[20] )];
  85     LOGPALETTE *palPtr = (LOGPALETTE *)buffer;
  86     int i;
  87
  88     /* create default palette (20 system colors) */
  89
  90     palPtr->palVersion = 0x300;
  91     palPtr->palNumEntries = 20;
  92     for (i = 0; i < 20; i++)
  93     {
  94         palPtr->palPalEntry[i].peRed   = entries[i < 10 ? i : 236 + i].rgbRed;
  95         palPtr->palPalEntry[i].peGreen = entries[i < 10 ? i : 236 + i].rgbGreen;
  96         palPtr->palPalEntry[i].peBlue  = entries[i < 10 ? i : 236 + i].rgbBlue;
  97         palPtr->palPalEntry[i].peFlags = 0;
  98     }
  99     return CreatePalette( palPtr );
 100 }
 101
 102
 103 /***********************************************************************
 104  * CreatePalette [GDI32.@]
 105  *
 106  * Creates a logical color palette.
 107  *
 108  * RETURNS
 109  *    Success: Handle to logical palette
 110  *    Failure: NULL
 111  */
 112 HPALETTE WINAPI CreatePalette(
 113     const LOGPALETTE* palette) /* [in] Pointer to logical color palette */
 114 {
 115     PALETTEOBJ * palettePtr;
 116     HPALETTE hpalette;
 117     int size;
 118
 119     if (!palette) return 0;
 120     TRACE("entries=%i\n", palette->palNumEntries);
 121
 122     if (!(palettePtr = HeapAlloc( GetProcessHeap(), 0, sizeof(*palettePtr) ))) return 0;
 123     palettePtr->unrealize = NULL;
 124     palettePtr->version = palette->palVersion;
 125     palettePtr->count   = palette->palNumEntries;
 126     size = palettePtr->count * sizeof(*palettePtr->entries);
 127     if (!(palettePtr->entries = HeapAlloc( GetProcessHeap(), 0, size )))
 128     {
 129         HeapFree( GetProcessHeap(), 0, palettePtr );
 130         return 0;
 131     }
 132     memcpy( palettePtr->entries, palette->palPalEntry, size );
 133     if (!(hpalette = alloc_gdi_handle( &palettePtr->header, OBJ_PAL, &palette_funcs )))
 134     {
 135         HeapFree( GetProcessHeap(), 0, palettePtr->entries );
 136         HeapFree( GetProcessHeap(), 0, palettePtr );
 137     }
 138     TRACE("   returning %p\n", hpalette);
 139     return hpalette;
 140 }
 141
 142
 143 /***********************************************************************
 144  * CreateHalftonePalette [GDI32.@]
 145  *
 146  * Creates a halftone palette.
 147  *
 148  * RETURNS
 149  *    Success: Handle to logical halftone palette
 150  *    Failure: 0
 151  *
 152  * FIXME: This simply creates the halftone palette derived from running
 153  *        tests on a windows NT machine. This is assuming a color depth
 154  *        of greater that 256 color. On a 256 color device the halftone
 155  *        palette will be different and this function will be incorrect
 156  */
 157 HPALETTE WINAPI CreateHalftonePalette(
 158     HDC hdc) /* [in] Handle to device context */
 159 {
 160     const RGBQUAD *entries = get_default_color_table( 8 );
 161     char buffer[FIELD_OFFSET( LOGPALETTE, palPalEntry[256] )];
 162     LOGPALETTE *pal = (LOGPALETTE *)buffer;
 163     int i;
 164
 165     pal->palVersion = 0x300;
 166     pal->palNumEntries = 256;
 167     for (i = 0; i < 256; i++)
 168     {
 169         pal->palPalEntry[i].peRed   = entries[i].rgbRed;
 170         pal->palPalEntry[i].peGreen = entries[i].rgbGreen;
 171         pal->palPalEntry[i].peBlue  = entries[i].rgbBlue;
 172         pal->palPalEntry[i].peFlags = 0;
 173     }
 174     return CreatePalette( pal );
 175 }
 176
 177
 178 /***********************************************************************
 179  * GetPaletteEntries [GDI32.@]
 180  *
 181  * Retrieves palette entries.
 182  *
 183  * RETURNS
 184  *    Success: Number of entries from logical palette
 185  *    Failure: 0
 186  */
 187 UINT WINAPI GetPaletteEntries(
 188     HPALETTE hpalette,    /* [in]  Handle of logical palette */
 189     UINT start,           /* [in]  First entry to receive */
 190     UINT count,           /* [in]  Number of entries to receive */
 191     LPPALETTEENTRY entries) /* [out] Address of array receiving entries */
 192 {
 193     PALETTEOBJ * palPtr;
 194     UINT numEntries;
 195
 196     TRACE("hpal = %p, count=%i\n", hpalette, count );
 197
 198     palPtr = GDI_GetObjPtr( hpalette, OBJ_PAL );
 199     if (!palPtr) return 0;
 200
 201     /* NOTE: not documented but test show this to be the case */
 202     if (count == 0)
 203     {
 204         count = palPtr->count;
 205     }
 206     else
 207     {
 208         numEntries = palPtr->count;
 209         if (start+count > numEntries) count = numEntries - start;
 210         if (entries)
 211         {
 212             if (start >= numEntries) count = 0;
 213             else memcpy( entries, &palPtr->entries[start], count * sizeof(PALETTEENTRY) );
 214         }
 215     }
 216
 217     GDI_ReleaseObj( hpalette );
 218     return count;
 219 }
 220
 221
 222 /***********************************************************************
 223  * SetPaletteEntries [GDI32.@]
 224  *
 225  * Sets color values for range in palette.
 226  *
 227  * RETURNS
 228  *    Success: Number of entries that were set
 229  *    Failure: 0
 230  */
 231 UINT WINAPI SetPaletteEntries(
 232     HPALETTE hpalette,    /* [in] Handle of logical palette */
 233     UINT start,           /* [in] Index of first entry to set */
 234     UINT count,           /* [in] Number of entries to set */
 235     const PALETTEENTRY *entries) /* [in] Address of array of structures */
 236 {
 237     PALETTEOBJ * palPtr;
 238     UINT numEntries;
 239
 240     TRACE("hpal=%p,start=%i,count=%i\n",hpalette,start,count );
 241
 242     if (hpalette == GetStockObject(DEFAULT_PALETTE)) return 0;
 243     palPtr = GDI_GetObjPtr( hpalette, OBJ_PAL );
 244     if (!palPtr) return 0;
 245
 246     numEntries = palPtr->count;
 247     if (start >= numEntries)
 248     {
 249       GDI_ReleaseObj( hpalette );
 250       return 0;
 251     }
 252     if (start+count > numEntries) count = numEntries - start;
 253     memcpy( &palPtr->entries[start], entries, count * sizeof(PALETTEENTRY) );
 254     GDI_ReleaseObj( hpalette );
 255     UnrealizeObject( hpalette );
 256     return count;
 257 }
 258
 259
 260 /***********************************************************************
 261  * ResizePalette [GDI32.@]
 262  *
 263  * Resizes logical palette.
 264  *
 265  * RETURNS
 266  *    Success: TRUE
 267  *    Failure: FALSE
 268  */
 269 BOOL WINAPI ResizePalette(
 270     HPALETTE hPal, /* [in] Handle of logical palette */
 271     UINT cEntries) /* [in] Number of entries in logical palette */
 272 {
 273     PALETTEOBJ * palPtr = GDI_GetObjPtr( hPal, OBJ_PAL );
 274     PALETTEENTRY *entries;
 275
 276     if( !palPtr ) return FALSE;
 277     TRACE("hpal = %p, prev = %i, new = %i\n", hPal, palPtr->count, cEntries );
 278
 279     if (!(entries = HeapReAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 280                                  palPtr->entries, cEntries * sizeof(*palPtr->entries) )))
 281     {
 282         GDI_ReleaseObj( hPal );
 283         return FALSE;
 284     }
 285     palPtr->entries = entries;
 286     palPtr->count = cEntries;
 287
 288     GDI_ReleaseObj( hPal );
 289     PALETTE_UnrealizeObject( hPal );
 290     return TRUE;
 291 }
 292
 293
 294 /***********************************************************************
 295  * AnimatePalette [GDI32.@]
 296  *
 297  * Replaces entries in logical palette.
 298  *
 299  * RETURNS
 300  *    Success: TRUE
 301  *    Failure: FALSE
 302  *
 303  * FIXME
 304  *    Should use existing mapping when animating a primary palette
 305  */
 306 BOOL WINAPI AnimatePalette(
 307     HPALETTE hPal,              /* [in] Handle to logical palette */
 308     UINT StartIndex,            /* [in] First entry in palette */
 309     UINT NumEntries,            /* [in] Count of entries in palette */
 310     const PALETTEENTRY* PaletteColors) /* [in] Pointer to first replacement */
 311 {
 312     TRACE("%p (%i - %i)\n", hPal, StartIndex,StartIndex+NumEntries);
 313
 314     if( hPal != GetStockObject(DEFAULT_PALETTE) )
 315     {
 316         PALETTEOBJ * palPtr;
 317         UINT pal_entries;
 318         const PALETTEENTRY *pptr = PaletteColors;
 319
 320         palPtr = GDI_GetObjPtr( hPal, OBJ_PAL );
 321         if (!palPtr) return 0;
 322
 323         pal_entries = palPtr->count;
 324         if (StartIndex >= pal_entries)
 325         {
 326           GDI_ReleaseObj( hPal );
 327           return 0;
 328         }
 329         if (StartIndex+NumEntries > pal_entries) NumEntries = pal_entries - StartIndex;
 330
 331         for (NumEntries += StartIndex; StartIndex < NumEntries; StartIndex++, pptr++) {
 332           /* According to MSDN, only animate PC_RESERVED colours */
 333           if (palPtr->entries[StartIndex].peFlags & PC_RESERVED) {
 334             TRACE("Animating colour (%d,%d,%d) to (%d,%d,%d)\n",
 335               palPtr->entries[StartIndex].peRed,
 336               palPtr->entries[StartIndex].peGreen,
 337               palPtr->entries[StartIndex].peBlue,
 338               pptr->peRed, pptr->peGreen, pptr->peBlue);
 339             palPtr->entries[StartIndex] = *pptr;
 340           } else {
 341             TRACE("Not animating entry %d -- not PC_RESERVED\n", StartIndex);
 342           }
 343         }
 344         GDI_ReleaseObj( hPal );
 345         /* FIXME: check for palette selected in active window */
 346     }
 347     return TRUE;
 348 }
 349
 350
 351 /***********************************************************************
 352  * SetSystemPaletteUse [GDI32.@]
 353  *
 354  * Specify whether the system palette contains 2 or 20 static colors.
 355  *
 356  * RETURNS
 357  *    Success: Previous system palette
 358  *    Failure: SYSPAL_ERROR
 359  */
 360 UINT WINAPI SetSystemPaletteUse(
 361     HDC hdc,  /* [in] Handle of device context */
 362     UINT use) /* [in] Palette-usage flag */
 363 {
 364     UINT old = SystemPaletteUse;
 365
 366     /* Device doesn't support colour palettes */
 367     if (!(GetDeviceCaps(hdc, RASTERCAPS) & RC_PALETTE)) {
 368         return SYSPAL_ERROR;
 369     }
 370
 371     switch (use) {
 372         case SYSPAL_NOSTATIC:
 373         case SYSPAL_NOSTATIC256:        /* WINVER >= 0x0500 */
 374         case SYSPAL_STATIC:
 375             SystemPaletteUse = use;
 376             return old;
 377         default:
 378             return SYSPAL_ERROR;
 379     }
 380 }
 381
 382
 383 /***********************************************************************
 384  * GetSystemPaletteUse [GDI32.@]
 385  *
 386  * Gets state of system palette.
 387  *
 388  * RETURNS
 389  *    Current state of system palette
 390  */
 391 UINT WINAPI GetSystemPaletteUse(
 392     HDC hdc) /* [in] Handle of device context */
 393 {
 394     return SystemPaletteUse;
 395 }
 396
 397
 398 /***********************************************************************
 399  * GetSystemPaletteEntries [GDI32.@]
 400  *
 401  * Gets range of palette entries.
 402  *
 403  * RETURNS
 404  *    Success: Number of entries retrieved from palette
 405  *    Failure: 0
 406  */
 407 UINT WINAPI GetSystemPaletteEntries(
 408     HDC hdc,              /* [in]  Handle of device context */
 409     UINT start,           /* [in]  Index of first entry to be retrieved */
 410     UINT count,           /* [in]  Number of entries to be retrieved */
 411     LPPALETTEENTRY entries) /* [out] Array receiving system-palette entries */
 412 {
 413     UINT ret = 0;
 414     DC *dc;
 415
 416     TRACE("hdc=%p,start=%i,count=%i\n", hdc,start,count);
 417
 418     if ((dc = get_dc_ptr( hdc )))
 419     {
 420         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pGetSystemPaletteEntries );
 421         ret = physdev->funcs->pGetSystemPaletteEntries( physdev, start, count, entries );
 422         release_dc_ptr( dc );
 423     }
 424     return ret;
 425 }
 426
 427
 428 /***********************************************************************
 429  * GetNearestPaletteIndex [GDI32.@]
 430  *
 431  * Gets palette index for color.
 432  *
 433  * NOTES
 434  *    Should index be initialized to CLR_INVALID instead of 0?
 435  *
 436  * RETURNS
 437  *    Success: Index of entry in logical palette
 438  *    Failure: CLR_INVALID
 439  */
 440 UINT WINAPI GetNearestPaletteIndex(
 441     HPALETTE hpalette, /* [in] Handle of logical color palette */
 442     COLORREF color)      /* [in] Color to be matched */
 443 {
 444     PALETTEOBJ* palObj = GDI_GetObjPtr( hpalette, OBJ_PAL );
 445     UINT index  = 0;
 446
 447     if( palObj )
 448     {
 449         int i, diff = 0x7fffffff;
 450         int r,g,b;
 451         PALETTEENTRY* entry = palObj->entries;
 452
 453         for( i = 0; i < palObj->count && diff ; i++, entry++)
 454         {
 455             r = entry->peRed - GetRValue(color);
 456             g = entry->peGreen - GetGValue(color);
 457             b = entry->peBlue - GetBValue(color);
 458
 459             r = r*r + g*g + b*b;
 460
 461             if( r < diff ) { index = i; diff = r; }
 462         }
 463         GDI_ReleaseObj( hpalette );
 464     }
 465     TRACE("(%p,%06x): returning %d\n", hpalette, color, index );
 466     return index;
 467 }
 468
 469
 470 /* null driver fallback implementation for GetNearestColor */
 471 COLORREF nulldrv_GetNearestColor( PHYSDEV dev, COLORREF color )
 472 {
 473     unsigned char spec_type;
 474
 475     if (!(GetDeviceCaps( dev->hdc, RASTERCAPS ) & RC_PALETTE)) return color;
 476
 477     spec_type = color >> 24;
 478     if (spec_type == 1 || spec_type == 2)
 479     {
 480         /* we need logical palette for PALETTERGB and PALETTEINDEX colorrefs */
 481         UINT index;
 482         PALETTEENTRY entry;
 483         HPALETTE hpal = GetCurrentObject( dev->hdc, OBJ_PAL );
 484
 485         if (!hpal) hpal = GetStockObject( DEFAULT_PALETTE );
 486         if (spec_type == 2) /* PALETTERGB */
 487             index = GetNearestPaletteIndex( hpal, color );
 488         else  /* PALETTEINDEX */
 489             index = LOWORD(color);
 490
 491         if (!GetPaletteEntries( hpal, index, 1, &entry ))
 492         {
 493             WARN("RGB(%x) : idx %d is out of bounds, assuming NULL\n", color, index );
 494             if (!GetPaletteEntries( hpal, 0, 1, &entry )) return CLR_INVALID;
 495         }
 496         color = RGB( entry.peRed, entry.peGreen, entry.peBlue );
 497     }
 498     return color & 0x00ffffff;
 499 }
 500
 501
 502 /***********************************************************************
 503  * GetNearestColor [GDI32.@]
 504  *
 505  * Gets a system color to match.
 506  *
 507  * RETURNS
 508  *    Success: Color from system palette that corresponds to given color
 509  *    Failure: CLR_INVALID
 510  */
 511 COLORREF WINAPI GetNearestColor(
 512     HDC hdc,      /* [in] Handle of device context */
 513     COLORREF color) /* [in] Color to be matched */
 514 {
 515     COLORREF nearest = CLR_INVALID;
 516     DC *dc;
 517
 518     if ((dc = get_dc_ptr( hdc )))
 519     {
 520         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pGetNearestColor );
 521         nearest = physdev->funcs->pGetNearestColor( physdev, color );
 522         release_dc_ptr( dc );
 523     }
 524     return nearest;
 525 }
 526
 527
 528 /***********************************************************************
 529  *           PALETTE_GetObject
 530  */
 531 static INT PALETTE_GetObject( HGDIOBJ handle, INT count, LPVOID buffer )
 532 {
 533     PALETTEOBJ *palette = GDI_GetObjPtr( handle, OBJ_PAL );
 534
 535     if (!palette) return 0;
 536
 537     if (buffer)
 538     {
 539         if (count > sizeof(WORD)) count = sizeof(WORD);
 540         memcpy( buffer, &palette->count, count );
 541     }
 542     else count = sizeof(WORD);
 543     GDI_ReleaseObj( handle );
 544     return count;
 545 }
 546
 547
 548 /***********************************************************************
 549  *           PALETTE_UnrealizeObject
 550  */
 551 static BOOL PALETTE_UnrealizeObject( HGDIOBJ handle )
 552 {
 553     PALETTEOBJ *palette = GDI_GetObjPtr( handle, OBJ_PAL );
 554
 555     if (palette)
 556     {
 557         unrealize_function unrealize = palette->unrealize;
 558         palette->unrealize = NULL;
 559         GDI_ReleaseObj( handle );
 560         if (unrealize) unrealize( handle );
 561     }
 562
 563     if (InterlockedCompareExchangePointer( (void **)&hLastRealizedPalette, 0, handle ) == handle)
 564         TRACE("unrealizing palette %p\n", handle);
 565
 566     return TRUE;
 567 }
 568
 569
 570 /***********************************************************************
 571  *           PALETTE_DeleteObject
 572  */
 573 static BOOL PALETTE_DeleteObject( HGDIOBJ handle )
 574 {
 575     PALETTEOBJ *obj;
 576
 577     PALETTE_UnrealizeObject( handle );
 578     if (!(obj = free_gdi_handle( handle ))) return FALSE;
 579     HeapFree( GetProcessHeap(), 0, obj->entries );
 580     return HeapFree( GetProcessHeap(), 0, obj );
 581 }
 582
 583
 584 /***********************************************************************
 585  *           GDISelectPalette    (Not a Windows API)
 586  */
 587 HPALETTE WINAPI GDISelectPalette( HDC hdc, HPALETTE hpal, WORD wBkg)
 588 {
 589     HPALETTE ret = 0;
 590     DC *dc;
 591
 592     TRACE("%p %p\n", hdc, hpal );
 593
 594     if (GetObjectType(hpal) != OBJ_PAL)
 595     {
 596       WARN("invalid selected palette %p\n",hpal);
 597       return 0;
 598     }
 599     if ((dc = get_dc_ptr( hdc )))
 600     {
 601         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSelectPalette );
 602         ret = dc->hPalette;
 603         if (physdev->funcs->pSelectPalette( physdev, hpal, FALSE ))
 604         {
 605             dc->hPalette = hpal;
 606             if (!wBkg) hPrimaryPalette = hpal;
 607         }
 608         else ret = 0;
 609         release_dc_ptr( dc );
 610     }
 611     return ret;
 612 }
 613
 614
 615 /***********************************************************************
 616  *           GDIRealizePalette    (Not a Windows API)
 617  */
 618 UINT WINAPI GDIRealizePalette( HDC hdc )
 619 {
 620     UINT realized = 0;
 621     DC* dc = get_dc_ptr( hdc );
 622
 623     if (!dc) return 0;
 624
 625     TRACE("%p...\n", hdc );
 626
 627     if( dc->hPalette == GetStockObject( DEFAULT_PALETTE ))
 628     {
 629         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pRealizeDefaultPalette );
 630         realized = physdev->funcs->pRealizeDefaultPalette( physdev );
 631     }
 632     else if (InterlockedExchangePointer( (void **)&hLastRealizedPalette, dc->hPalette ) != dc->hPalette)
 633     {
 634         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pRealizePalette );
 635         PALETTEOBJ *palPtr = GDI_GetObjPtr( dc->hPalette, OBJ_PAL );
 636         if (palPtr)
 637         {
 638             realized = physdev->funcs->pRealizePalette( physdev, dc->hPalette,
 639                                                         (dc->hPalette == hPrimaryPalette) );
 640             palPtr->unrealize = physdev->funcs->pUnrealizePalette;
 641             GDI_ReleaseObj( dc->hPalette );
 642         }
 643     }
 644     else TRACE("  skipping (hLastRealizedPalette = %p)\n", hLastRealizedPalette);
 645
 646     release_dc_ptr( dc );
 647     TRACE("   realized %i colors.\n", realized );
 648     return realized;
 649 }
 650
 651
 652 /***********************************************************************
 653  * SelectPalette [GDI32.@]
 654  *
 655  * Selects logical palette into DC.
 656  *
 657  * RETURNS
 658  *    Success: Previous logical palette
 659  *    Failure: NULL
 660  */
 661 HPALETTE WINAPI SelectPalette(
 662     HDC hDC,               /* [in] Handle of device context */
 663     HPALETTE hPal,         /* [in] Handle of logical color palette */
 664     BOOL bForceBackground) /* [in] Foreground/background mode */
 665 {
 666     return pfnSelectPalette( hDC, hPal, bForceBackground );
 667 }
 668
 669
 670 /***********************************************************************
 671  * RealizePalette [GDI32.@]
 672  *
 673  * Maps palette entries to system palette.
 674  *
 675  * RETURNS
 676  *    Success: Number of entries in logical palette
 677  *    Failure: GDI_ERROR
 678  */
 679 UINT WINAPI RealizePalette(
 680     HDC hDC) /* [in] Handle of device context */
 681 {
 682     return pfnRealizePalette( hDC );
 683 }
 684
 685
 686 typedef HWND (WINAPI *WindowFromDC_funcptr)( HDC );
 687 typedef BOOL (WINAPI *RedrawWindow_funcptr)( HWND, const RECT *, HRGN, UINT );
 688
 689 /**********************************************************************
 690  * UpdateColors [GDI32.@]
 691  *
 692  * Remaps current colors to logical palette.
 693  *
 694  * RETURNS
 695  *    Success: TRUE
 696  *    Failure: FALSE
 697  */
 698 BOOL WINAPI UpdateColors(
 699     HDC hDC) /* [in] Handle of device context */
 700 {
 701     HMODULE mod;
 702     int size = GetDeviceCaps( hDC, SIZEPALETTE );
 703
 704     if (!size) return 0;
 705
 706     mod = GetModuleHandleA("user32.dll");
 707     if (mod)
 708     {
 709         WindowFromDC_funcptr pWindowFromDC = (WindowFromDC_funcptr)GetProcAddress(mod,"WindowFromDC");
 710         if (pWindowFromDC)
 711         {
 712             HWND hWnd = pWindowFromDC( hDC );
 713
 714             /* Docs say that we have to remap current drawable pixel by pixel
 715              * but it would take forever given the speed of XGet/PutPixel.
 716              */
 717             if (hWnd && size)
 718             {
 719                 RedrawWindow_funcptr pRedrawWindow = (void *)GetProcAddress( mod, "RedrawWindow" );
 720                 if (pRedrawWindow) pRedrawWindow( hWnd, NULL, 0, RDW_INVALIDATE );
 721             }
 722         }
 723     }
 724     return 0x666;
 725 }
 726
 727 /*********************************************************************
 728  *           SetMagicColors   (GDI32.@)
 729  */
 730 BOOL WINAPI SetMagicColors(HDC hdc, ULONG u1, ULONG u2)
 731 {
 732     FIXME("(%p 0x%08x 0x%08x): stub\n", hdc, u1, u2);
 733     return TRUE;
 734 }