aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/hw/xwin/winshadgdi.c
blob: 912f7e41f69adeecee56ea58038bb99d5cf8ce90 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
/*
 *Copyright (C) 2001-2004 Harold L Hunt II All Rights Reserved.
 *
 *Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 *"Software"), to deal in the Software without restriction, including
 *without limitation the rights to use, copy, modify, merge, publish,
 *distribute, sublicense, and/or sell copies of the Software, and to
 *permit persons to whom the Software is furnished to do so, subject to
 *the following conditions:
 *
 *The above copyright notice and this permission notice shall be
 *included in all copies or substantial portions of the Software.
 *
 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
 *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *Except as contained in this notice, the name of Harold L Hunt II
 *shall not be used in advertising or otherwise to promote the sale, use
 *or other dealings in this Software without prior written authorization
 *from Harold L Hunt II.
 *
 * Authors:	Harold L Hunt II
 */

#ifdef HAVE_XWIN_CONFIG_H
#include <xwin-config.h>
#endif
#include "win.h"

/*
 * Local function prototypes
 */

#ifdef XWIN_MULTIWINDOW
static wBOOL CALLBACK winRedrawAllProcShadowGDI(HWND hwnd, LPARAM lParam);

static wBOOL CALLBACK winRedrawDamagedWindowShadowGDI(HWND hwnd, LPARAM lParam);
#endif

static Bool
 winAllocateFBShadowGDI(ScreenPtr pScreen);

static void
 winShadowUpdateGDI(ScreenPtr pScreen, shadowBufPtr pBuf);

static Bool
 winCloseScreenShadowGDI(ScreenPtr pScreen);

static Bool
 winInitVisualsShadowGDI(ScreenPtr pScreen);

static Bool
 winAdjustVideoModeShadowGDI(ScreenPtr pScreen);

static Bool
 winBltExposedRegionsShadowGDI(ScreenPtr pScreen);

static Bool
 winActivateAppShadowGDI(ScreenPtr pScreen);

static Bool
 winRedrawScreenShadowGDI(ScreenPtr pScreen);

static Bool
 winRealizeInstalledPaletteShadowGDI(ScreenPtr pScreen);

static Bool
 winInstallColormapShadowGDI(ColormapPtr pColormap);

static Bool
 winStoreColorsShadowGDI(ColormapPtr pmap, int ndef, xColorItem * pdefs);

static Bool
 winCreateColormapShadowGDI(ColormapPtr pColormap);

static Bool
 winDestroyColormapShadowGDI(ColormapPtr pColormap);

/*
 * Internal function to get the DIB format that is compatible with the screen
 */

static
    Bool
winQueryScreenDIBFormat(ScreenPtr pScreen, BITMAPINFOHEADER * pbmih)
{
    winScreenPriv(pScreen);
    HBITMAP hbmp;

#if CYGDEBUG
    LPDWORD pdw = NULL;
#endif

    /* Create a memory bitmap compatible with the screen */
    hbmp = CreateCompatibleBitmap(pScreenPriv->hdcScreen, 1, 1);
    if (hbmp == NULL) {
        ErrorF("winQueryScreenDIBFormat - CreateCompatibleBitmap failed\n");
        return FALSE;
    }

    /* Initialize our bitmap info header */
    ZeroMemory(pbmih, sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
    pbmih->biSize = sizeof(BITMAPINFOHEADER);

    /* Get the biBitCount */
    if (!GetDIBits(pScreenPriv->hdcScreen,
                   hbmp, 0, 1, NULL, (BITMAPINFO *) pbmih, DIB_RGB_COLORS)) {
        ErrorF("winQueryScreenDIBFormat - First call to GetDIBits failed\n");
        DeleteObject(hbmp);
        return FALSE;
    }

#if CYGDEBUG
    /* Get a pointer to bitfields */
    pdw = (DWORD *) ((CARD8 *) pbmih + sizeof(BITMAPINFOHEADER));

    winDebug("winQueryScreenDIBFormat - First call masks: %08x %08x %08x\n",
             pdw[0], pdw[1], pdw[2]);
#endif

    /* Get optimal color table, or the optimal bitfields */
    if (!GetDIBits(pScreenPriv->hdcScreen,
                   hbmp, 0, 1, NULL, (BITMAPINFO *) pbmih, DIB_RGB_COLORS)) {
        ErrorF("winQueryScreenDIBFormat - Second call to GetDIBits "
               "failed\n");
        DeleteObject(hbmp);
        return FALSE;
    }

    /* Free memory */
    DeleteObject(hbmp);

    return TRUE;
}

/*
 * Internal function to determine the GDI bits per rgb and bit masks
 */

static
    Bool
winQueryRGBBitsAndMasks(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    BITMAPINFOHEADER *pbmih = NULL;
    Bool fReturn = TRUE;
    LPDWORD pdw = NULL;
    DWORD dwRedBits, dwGreenBits, dwBlueBits;

    /* Color masks for 8 bpp are standardized */
    if (GetDeviceCaps(pScreenPriv->hdcScreen, RASTERCAPS) & RC_PALETTE) {
        /* 
         * RGB BPP for 8 bit palletes is always 8
         * and the color masks are always 0.
         */
        pScreenPriv->dwBitsPerRGB = 8;
        pScreenPriv->dwRedMask = 0x0L;
        pScreenPriv->dwGreenMask = 0x0L;
        pScreenPriv->dwBlueMask = 0x0L;
        return TRUE;
    }

    /* Color masks for 24 bpp are standardized */
    if (GetDeviceCaps(pScreenPriv->hdcScreen, PLANES)
        * GetDeviceCaps(pScreenPriv->hdcScreen, BITSPIXEL) == 24) {
        ErrorF("winQueryRGBBitsAndMasks - GetDeviceCaps (BITSPIXEL) "
               "returned 24 for the screen.  Using default 24bpp masks.\n");

        /* 8 bits per primary color */
        pScreenPriv->dwBitsPerRGB = 8;

        /* Set screen privates masks */
        pScreenPriv->dwRedMask = WIN_24BPP_MASK_RED;
        pScreenPriv->dwGreenMask = WIN_24BPP_MASK_GREEN;
        pScreenPriv->dwBlueMask = WIN_24BPP_MASK_BLUE;

        return TRUE;
    }

    /* Allocate a bitmap header and color table */
    pbmih = (BITMAPINFOHEADER *) malloc(sizeof(BITMAPINFOHEADER)
                                        + 256 * sizeof(RGBQUAD));
    if (pbmih == NULL) {
        ErrorF("winQueryRGBBitsAndMasks - malloc failed\n");
        return FALSE;
    }

    /* Get screen description */
    if (winQueryScreenDIBFormat(pScreen, pbmih)) {
        /* Get a pointer to bitfields */
        pdw = (DWORD *) ((CARD8 *) pbmih + sizeof(BITMAPINFOHEADER));

#if CYGDEBUG
        winDebug("%s - Masks: %08x %08x %08x\n", __FUNCTION__,
                 pdw[0], pdw[1], pdw[2]);
        winDebug("%s - Bitmap: %dx%d %d bpp %d planes\n", __FUNCTION__,
                 pbmih->biWidth, pbmih->biHeight, pbmih->biBitCount,
                 pbmih->biPlanes);
        winDebug("%s - Compression: %d %s\n", __FUNCTION__,
                 pbmih->biCompression,
                 (pbmih->biCompression ==
                  BI_RGB ? "(BI_RGB)" : (pbmih->biCompression ==
                                         BI_RLE8 ? "(BI_RLE8)" : (pbmih->
                                                                  biCompression
                                                                  ==
                                                                  BI_RLE4 ?
                                                                  "(BI_RLE4)"
                                                                  : (pbmih->
                                                                     biCompression
                                                                     ==
                                                                     BI_BITFIELDS
                                                                     ?
                                                                     "(BI_BITFIELDS)"
                                                                     : "")))));
#endif

        /* Handle BI_RGB case, which is returned by Wine */
        if (pbmih->biCompression == BI_RGB) {
            dwRedBits = 5;
            dwGreenBits = 5;
            dwBlueBits = 5;

            pScreenPriv->dwBitsPerRGB = 5;

            /* Set screen privates masks */
            pScreenPriv->dwRedMask = 0x7c00;
            pScreenPriv->dwGreenMask = 0x03e0;
            pScreenPriv->dwBlueMask = 0x001f;
        }
        else {
            /* Count the number of bits in each mask */
            dwRedBits = winCountBits(pdw[0]);
            dwGreenBits = winCountBits(pdw[1]);
            dwBlueBits = winCountBits(pdw[2]);

            /* Find maximum bits per red, green, blue */
            if (dwRedBits > dwGreenBits && dwRedBits > dwBlueBits)
                pScreenPriv->dwBitsPerRGB = dwRedBits;
            else if (dwGreenBits > dwRedBits && dwGreenBits > dwBlueBits)
                pScreenPriv->dwBitsPerRGB = dwGreenBits;
            else
                pScreenPriv->dwBitsPerRGB = dwBlueBits;

            /* Set screen privates masks */
            pScreenPriv->dwRedMask = pdw[0];
            pScreenPriv->dwGreenMask = pdw[1];
            pScreenPriv->dwBlueMask = pdw[2];
        }
    }
    else {
        ErrorF("winQueryRGBBitsAndMasks - winQueryScreenDIBFormat failed\n");
        fReturn = FALSE;
    }

    /* Free memory */
    free(pbmih);

    return fReturn;
}

#ifdef XWIN_MULTIWINDOW
/*
 * Redraw all ---?
 */

static wBOOL CALLBACK
winRedrawAllProcShadowGDI(HWND hwnd, LPARAM lParam)
{
    if (hwnd == (HWND) lParam)
        return TRUE;
    InvalidateRect(hwnd, NULL, FALSE);
    UpdateWindow(hwnd);
    return TRUE;
}

static wBOOL CALLBACK
winRedrawDamagedWindowShadowGDI(HWND hwnd, LPARAM lParam)
{
    BoxPtr pDamage = (BoxPtr) lParam;
    RECT rcClient, rcDamage, rcRedraw;
    POINT topLeft, bottomRight;

    if (IsIconic(hwnd))
        return TRUE;            /* Don't care minimized windows */

    /* Convert the damaged area from Screen coords to Client coords */
    topLeft.x = pDamage->x1;
    topLeft.y = pDamage->y1;
    bottomRight.x = pDamage->x2;
    bottomRight.y = pDamage->y2;
    topLeft.x += GetSystemMetrics(SM_XVIRTUALSCREEN);
    bottomRight.x += GetSystemMetrics(SM_XVIRTUALSCREEN);
    topLeft.y += GetSystemMetrics(SM_YVIRTUALSCREEN);
    bottomRight.y += GetSystemMetrics(SM_YVIRTUALSCREEN);
    ScreenToClient(hwnd, &topLeft);
    ScreenToClient(hwnd, &bottomRight);
    SetRect(&rcDamage, topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);

    GetClientRect(hwnd, &rcClient);

    if (IntersectRect(&rcRedraw, &rcClient, &rcDamage)) {
        InvalidateRect(hwnd, &rcRedraw, FALSE);
        UpdateWindow(hwnd);
    }
    return TRUE;
}
#endif

/*
 * Allocate a DIB for the shadow framebuffer GDI server
 */

static Bool
winAllocateFBShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;
    DIBSECTION dibsection;
    Bool fReturn = TRUE;

    /* Describe shadow bitmap to be created */
    pScreenPriv->pbmih->biWidth = pScreenInfo->dwWidth;
    pScreenPriv->pbmih->biHeight = -pScreenInfo->dwHeight;

    ErrorF("winAllocateFBShadowGDI - Creating DIB with width: %d height: %d "
           "depth: %d\n",
           (int) pScreenPriv->pbmih->biWidth,
           (int) -pScreenPriv->pbmih->biHeight, pScreenPriv->pbmih->biBitCount);

    /* Create a DI shadow bitmap with a bit pointer */
    pScreenPriv->hbmpShadow = CreateDIBSection(pScreenPriv->hdcScreen,
                                               (BITMAPINFO *) pScreenPriv->
                                               pbmih, DIB_RGB_COLORS,
                                               (VOID **) & pScreenInfo->pfb,
                                               NULL, 0);
    if (pScreenPriv->hbmpShadow == NULL || pScreenInfo->pfb == NULL) {
        winW32Error(2, "winAllocateFBShadowGDI - CreateDIBSection failed:");
        return FALSE;
    }
    else {
#if CYGDEBUG
        winDebug("winAllocateFBShadowGDI - Shadow buffer allocated\n");
#endif
    }

    /* Get information about the bitmap that was allocated */
    GetObject(pScreenPriv->hbmpShadow, sizeof(dibsection), &dibsection);

#if CYGDEBUG || YES
    /* Print information about bitmap allocated */
    winDebug("winAllocateFBShadowGDI - Dibsection width: %d height: %d "
             "depth: %d size image: %d\n",
             (int) dibsection.dsBmih.biWidth, (int) dibsection.dsBmih.biHeight,
             dibsection.dsBmih.biBitCount, (int) dibsection.dsBmih.biSizeImage);
#endif

    /* Select the shadow bitmap into the shadow DC */
    SelectObject(pScreenPriv->hdcShadow, pScreenPriv->hbmpShadow);

#if CYGDEBUG
    winDebug("winAllocateFBShadowGDI - Attempting a shadow blit\n");
#endif

    /* Do a test blit from the shadow to the screen, I think */
    fReturn = BitBlt(pScreenPriv->hdcScreen,
                     0, 0,
                     pScreenInfo->dwWidth, pScreenInfo->dwHeight,
                     pScreenPriv->hdcShadow, 0, 0, SRCCOPY);
    if (fReturn) {
#if CYGDEBUG
        winDebug("winAllocateFBShadowGDI - Shadow blit success\n");
#endif
    }
    else {
        winW32Error(2, "winAllocateFBShadowGDI - Shadow blit failure\n");
#if 0
        return FALSE;
#else
        /* ago: ignore this error. The blit fails with wine, but does not 
         * cause any problems later. */

        fReturn = TRUE;
#endif
    }

    /* Look for height weirdness */
    if (dibsection.dsBmih.biHeight < 0) {
        dibsection.dsBmih.biHeight = -dibsection.dsBmih.biHeight;
    }

    /* Set screeninfo stride */
    pScreenInfo->dwStride = ((dibsection.dsBmih.biSizeImage
                              / dibsection.dsBmih.biHeight)
                             * 8) / pScreenInfo->dwBPP;

#if CYGDEBUG || YES
    winDebug("winAllocateFBShadowGDI - Created shadow stride: %d\n",
             (int) pScreenInfo->dwStride);
#endif

#ifdef XWIN_MULTIWINDOW
    /* Redraw all windows */
    if (pScreenInfo->fMultiWindow)
        EnumThreadWindows(g_dwCurrentThreadID, winRedrawAllProcShadowGDI, 0);
#endif

    return fReturn;
}

static void
winFreeFBShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;

    /* Free the shadow bitmap */
    DeleteObject(pScreenPriv->hbmpShadow);

    /* Invalidate the ScreenInfo's fb pointer */
    pScreenInfo->pfb = NULL;
}

/*
 * Blit the damaged regions of the shadow fb to the screen
 */

static void
winShadowUpdateGDI(ScreenPtr pScreen, shadowBufPtr pBuf)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;
    RegionPtr damage = shadowDamage(pBuf);
    DWORD dwBox = RegionNumRects(damage);
    BoxPtr pBox = RegionRects(damage);
    int x, y, w, h;
    HRGN hrgnCombined = NULL;

#ifdef XWIN_UPDATESTATS
    static DWORD s_dwNonUnitRegions = 0;
    static DWORD s_dwTotalUpdates = 0;
    static DWORD s_dwTotalBoxes = 0;
#endif
    BoxPtr pBoxExtents = RegionExtents(damage);

    /*
     * Return immediately if the app is not active
     * and we are fullscreen, or if we have a bad display depth
     */
    if ((!pScreenPriv->fActive && pScreenInfo->fFullScreen)
        || pScreenPriv->fBadDepth)
        return;

#ifdef XWIN_UPDATESTATS
    ++s_dwTotalUpdates;
    s_dwTotalBoxes += dwBox;

    if (dwBox != 1) {
        ++s_dwNonUnitRegions;
        ErrorF("winShadowUpdatGDI - dwBox: %d\n", dwBox);
    }

    if ((s_dwTotalUpdates % 100) == 0)
        ErrorF("winShadowUpdateGDI - %d%% non-unity regions, avg boxes: %d "
               "nu: %d tu: %d\n",
               (s_dwNonUnitRegions * 100) / s_dwTotalUpdates,
               s_dwTotalBoxes / s_dwTotalUpdates,
               s_dwNonUnitRegions, s_dwTotalUpdates);
#endif                          /* XWIN_UPDATESTATS */

    /*
     * Handle small regions with multiple blits,
     * handle large regions by creating a clipping region and 
     * doing a single blit constrained to that clipping region.
     */
    if (!pScreenInfo->fMultiWindow &&
        (pScreenInfo->dwClipUpdatesNBoxes == 0 ||
         dwBox < pScreenInfo->dwClipUpdatesNBoxes)) {
        /* Loop through all boxes in the damaged region */
        while (dwBox--) {
            /*
             * Calculate x offset, y offset, width, and height for
             * current damage box
             */
            x = pBox->x1;
            y = pBox->y1;
            w = pBox->x2 - pBox->x1;
            h = pBox->y2 - pBox->y1;

            BitBlt(pScreenPriv->hdcScreen,
                   x, y, w, h, pScreenPriv->hdcShadow, x, y, SRCCOPY);

            /* Get a pointer to the next box */
            ++pBox;
        }
    }
    else if (!pScreenInfo->fMultiWindow) {

        /* Compute a GDI region from the damaged region */
        hrgnCombined =
            CreateRectRgn(pBoxExtents->x1, pBoxExtents->y1, pBoxExtents->x2,
                          pBoxExtents->y2);

        /* Install the GDI region as a clipping region */
        SelectClipRgn(pScreenPriv->hdcScreen, hrgnCombined);
        DeleteObject(hrgnCombined);
        hrgnCombined = NULL;

        /*
         * Blit the shadow buffer to the screen,
         * constrained to the clipping region.
         */
        BitBlt(pScreenPriv->hdcScreen,
               pBoxExtents->x1, pBoxExtents->y1,
               pBoxExtents->x2 - pBoxExtents->x1,
               pBoxExtents->y2 - pBoxExtents->y1,
               pScreenPriv->hdcShadow,
               pBoxExtents->x1, pBoxExtents->y1, SRCCOPY);

        /* Reset the clip region */
        SelectClipRgn(pScreenPriv->hdcScreen, NULL);
    }

#ifdef XWIN_MULTIWINDOW
    /* Redraw all multiwindow windows */
    if (pScreenInfo->fMultiWindow)
        EnumThreadWindows(g_dwCurrentThreadID,
                          winRedrawDamagedWindowShadowGDI,
                          (LPARAM) pBoxExtents);
#endif
}

static Bool
winInitScreenShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);

    /* Get device contexts for the screen and shadow bitmap */
    pScreenPriv->hdcScreen = GetDC(pScreenPriv->hwndScreen);
    pScreenPriv->hdcShadow = CreateCompatibleDC(pScreenPriv->hdcScreen);

    /* Allocate bitmap info header */
    pScreenPriv->pbmih = (BITMAPINFOHEADER *) malloc(sizeof(BITMAPINFOHEADER)
                                                     + 256 * sizeof(RGBQUAD));
    if (pScreenPriv->pbmih == NULL) {
        ErrorF("winInitScreenShadowGDI - malloc () failed\n");
        return FALSE;
    }

    /* Query the screen format */
    if (!winQueryScreenDIBFormat(pScreen, pScreenPriv->pbmih)) {
        ErrorF("winInitScreenShadowGDI - winQueryScreenDIBFormat failed\n");
        return FALSE;
    }

    /* Determine our color masks */
    if (!winQueryRGBBitsAndMasks(pScreen)) {
        ErrorF("winInitScreenShadowGDI - winQueryRGBBitsAndMasks failed\n");
        return FALSE;
    }

    return winAllocateFBShadowGDI(pScreen);
}

/* See Porting Layer Definition - p. 33 */
/*
 * We wrap whatever CloseScreen procedure was specified by fb;
 * a pointer to said procedure is stored in our privates.
 */

static Bool
winCloseScreenShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;
    Bool fReturn;

#if CYGDEBUG
    winDebug("winCloseScreenShadowGDI - Freeing screen resources\n");
#endif

    /* Flag that the screen is closed */
    pScreenPriv->fClosed = TRUE;
    pScreenPriv->fActive = FALSE;

    /* Call the wrapped CloseScreen procedure */
    WIN_UNWRAP(CloseScreen);
    if (pScreen->CloseScreen)
        fReturn = (*pScreen->CloseScreen) (pScreen);

    /* Delete the window property */
    RemoveProp(pScreenPriv->hwndScreen, WIN_SCR_PROP);

    /* Free the shadow DC; which allows the bitmap to be freed */
    DeleteDC(pScreenPriv->hdcShadow);

    winFreeFBShadowGDI(pScreen);

    /* Free the screen DC */
    ReleaseDC(pScreenPriv->hwndScreen, pScreenPriv->hdcScreen);

    /* Delete tray icon, if we have one */
    if (!pScreenInfo->fNoTrayIcon)
        winDeleteNotifyIcon(pScreenPriv);

    /* Free the exit confirmation dialog box, if it exists */
    if (g_hDlgExit != NULL) {
        DestroyWindow(g_hDlgExit);
        g_hDlgExit = NULL;
    }

    /* Kill our window */
    if (pScreenPriv->hwndScreen) {
        DestroyWindow(pScreenPriv->hwndScreen);
        pScreenPriv->hwndScreen = NULL;
    }

#if defined(XWIN_CLIPBOARD) || defined(XWIN_MULTIWINDOW)
    /* Destroy the thread startup mutex */
    pthread_mutex_destroy(&pScreenPriv->pmServerStarted);
#endif

    /* Invalidate our screeninfo's pointer to the screen */
    pScreenInfo->pScreen = NULL;

    /* Free the screen privates for this screen */
    free((pointer) pScreenPriv);

    return fReturn;
}

/*
 * Tell mi what sort of visuals we need.
 * 
 * Generally we only need one visual, as our screen can only
 * handle one format at a time, I believe.  You may want
 * to verify that last sentence.
 */

static Bool
winInitVisualsShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;

    /* Display debugging information */
    ErrorF("winInitVisualsShadowGDI - Masks %08x %08x %08x BPRGB %d d %d "
           "bpp %d\n",
           (unsigned int) pScreenPriv->dwRedMask,
           (unsigned int) pScreenPriv->dwGreenMask,
           (unsigned int) pScreenPriv->dwBlueMask,
           (int) pScreenPriv->dwBitsPerRGB,
           (int) pScreenInfo->dwDepth, (int) pScreenInfo->dwBPP);

    /* Create a single visual according to the Windows screen depth */
    switch (pScreenInfo->dwDepth) {
    case 24:
    case 16:
    case 15:
        /* Setup the real visual */
        if (!miSetVisualTypesAndMasks(pScreenInfo->dwDepth,
                                      TrueColorMask,
                                      pScreenPriv->dwBitsPerRGB,
                                      -1,
                                      pScreenPriv->dwRedMask,
                                      pScreenPriv->dwGreenMask,
                                      pScreenPriv->dwBlueMask)) {
            ErrorF("winInitVisualsShadowGDI - miSetVisualTypesAndMasks "
                   "failed\n");
            return FALSE;
        }

#ifdef XWIN_EMULATEPSEUDO
        if (!pScreenInfo->fEmulatePseudo)
            break;

        /* Setup a pseudocolor visual */
        if (!miSetVisualTypesAndMasks(8, PseudoColorMask, 8, -1, 0, 0, 0)) {
            ErrorF("winInitVisualsShadowGDI - miSetVisualTypesAndMasks "
                   "failed for PseudoColor\n");
            return FALSE;
        }
#endif
        break;

    case 8:
        if (!miSetVisualTypesAndMasks(pScreenInfo->dwDepth,
                                      PseudoColorMask,
                                      pScreenPriv->dwBitsPerRGB,
                                      PseudoColor,
                                      pScreenPriv->dwRedMask,
                                      pScreenPriv->dwGreenMask,
                                      pScreenPriv->dwBlueMask)) {
            ErrorF("winInitVisualsShadowGDI - miSetVisualTypesAndMasks "
                   "failed\n");
            return FALSE;
        }
        break;

    default:
        ErrorF("winInitVisualsShadowGDI - Unknown screen depth\n");
        return FALSE;
    }

#if CYGDEBUG
    winDebug("winInitVisualsShadowGDI - Returning\n");
#endif

    return TRUE;
}

/*
 * Adjust the proposed video mode
 */

static Bool
winAdjustVideoModeShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;
    HDC hdc;
    DWORD dwBPP;

    hdc = GetDC(NULL);

    /* We're in serious trouble if we can't get a DC */
    if (hdc == NULL) {
        ErrorF("winAdjustVideoModeShadowGDI - GetDC () failed\n");
        return FALSE;
    }

    /* Query GDI for current display depth */
    dwBPP = GetDeviceCaps(hdc, BITSPIXEL);

    /* GDI cannot change the screen depth, so always use GDI's depth */
    pScreenInfo->dwBPP = dwBPP;

    /* Release our DC */
    ReleaseDC(NULL, hdc);
    hdc = NULL;

    return TRUE;
}

/*
 * Blt exposed regions to the screen
 */

static Bool
winBltExposedRegionsShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;
    winPrivCmapPtr pCmapPriv = NULL;
    HDC hdcUpdate;
    PAINTSTRUCT ps;

    /* BeginPaint gives us an hdc that clips to the invalidated region */
    hdcUpdate = BeginPaint(pScreenPriv->hwndScreen, &ps);

    /* Realize the palette, if we have one */
    if (pScreenPriv->pcmapInstalled != NULL) {
        pCmapPriv = winGetCmapPriv(pScreenPriv->pcmapInstalled);

        SelectPalette(hdcUpdate, pCmapPriv->hPalette, FALSE);
        RealizePalette(hdcUpdate);
    }

    /* Our BitBlt will be clipped to the invalidated region */
    BitBlt(hdcUpdate,
           0, 0,
           pScreenInfo->dwWidth, pScreenInfo->dwHeight,
           pScreenPriv->hdcShadow, 0, 0, SRCCOPY);

    /* EndPaint frees the DC */
    EndPaint(pScreenPriv->hwndScreen, &ps);

#ifdef XWIN_MULTIWINDOW
    /* Redraw all windows */
    if (pScreenInfo->fMultiWindow)
        EnumThreadWindows(g_dwCurrentThreadID, winRedrawAllProcShadowGDI,
                          (LPARAM) pScreenPriv->hwndScreen);
#endif

    return TRUE;
}

/*
 * Do any engine-specific appliation-activation processing
 */

static Bool
winActivateAppShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;

    /*
     * 2004/04/12 - Harold - We perform the restoring or minimizing
     * manually for ShadowGDI in fullscreen modes so that this engine
     * will perform just like ShadowDD and ShadowDDNL in fullscreen mode;
     * if we do not do this then our fullscreen window will appear in the
     * z-order when it is deactivated and it can be uncovered by resizing
     * or minimizing another window that is on top of it, which is not how
     * the DirectDraw engines work.  Therefore we keep this code here to
     * make sure that all engines work the same in fullscreen mode.
     */

    /*
     * Are we active?
     * Are we fullscreen?
     */
    if (pScreenPriv->fActive && pScreenInfo->fFullScreen) {
        /*
         * Activating, attempt to bring our window 
         * to the top of the display
         */
        ShowWindow(pScreenPriv->hwndScreen, SW_RESTORE);
    }
    else if (!pScreenPriv->fActive && pScreenInfo->fFullScreen) {
        /*
         * Deactivating, stuff our window onto the
         * task bar.
         */
        ShowWindow(pScreenPriv->hwndScreen, SW_MINIMIZE);
    }

    return TRUE;
}

/*
 * Reblit the shadow framebuffer to the screen.
 */

static Bool
winRedrawScreenShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;

    /* Redraw the whole window, to take account for the new colors */
    BitBlt(pScreenPriv->hdcScreen,
           0, 0,
           pScreenInfo->dwWidth, pScreenInfo->dwHeight,
           pScreenPriv->hdcShadow, 0, 0, SRCCOPY);

#ifdef XWIN_MULTIWINDOW
    /* Redraw all windows */
    if (pScreenInfo->fMultiWindow)
        EnumThreadWindows(g_dwCurrentThreadID, winRedrawAllProcShadowGDI, 0);
#endif

    return TRUE;
}

/*
 * Realize the currently installed colormap
 */

static Bool
winRealizeInstalledPaletteShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winPrivCmapPtr pCmapPriv = NULL;

#if CYGDEBUG
    winDebug("winRealizeInstalledPaletteShadowGDI\n");
#endif

    /* Don't do anything if there is not a colormap */
    if (pScreenPriv->pcmapInstalled == NULL) {
#if CYGDEBUG
        winDebug("winRealizeInstalledPaletteShadowGDI - No colormap "
                 "installed\n");
#endif
        return TRUE;
    }

    pCmapPriv = winGetCmapPriv(pScreenPriv->pcmapInstalled);

    /* Realize our palette for the screen */
    if (RealizePalette(pScreenPriv->hdcScreen) == GDI_ERROR) {
        ErrorF("winRealizeInstalledPaletteShadowGDI - RealizePalette () "
               "failed\n");
        return FALSE;
    }

    /* Set the DIB color table */
    if (SetDIBColorTable(pScreenPriv->hdcShadow,
                         0,
                         WIN_NUM_PALETTE_ENTRIES, pCmapPriv->rgbColors) == 0) {
        ErrorF("winRealizeInstalledPaletteShadowGDI - SetDIBColorTable () "
               "failed\n");
        return FALSE;
    }

    return TRUE;
}

/*
 * Install the specified colormap
 */

static Bool
winInstallColormapShadowGDI(ColormapPtr pColormap)
{
    ScreenPtr pScreen = pColormap->pScreen;

    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;

    winCmapPriv(pColormap);

    /*
     * Tell Windows to install the new colormap
     */
    if (SelectPalette(pScreenPriv->hdcScreen,
                      pCmapPriv->hPalette, FALSE) == NULL) {
        ErrorF("winInstallColormapShadowGDI - SelectPalette () failed\n");
        return FALSE;
    }

    /* Realize the palette */
    if (GDI_ERROR == RealizePalette(pScreenPriv->hdcScreen)) {
        ErrorF("winInstallColormapShadowGDI - RealizePalette () failed\n");
        return FALSE;
    }

    /* Set the DIB color table */
    if (SetDIBColorTable(pScreenPriv->hdcShadow,
                         0,
                         WIN_NUM_PALETTE_ENTRIES, pCmapPriv->rgbColors) == 0) {
        ErrorF("winInstallColormapShadowGDI - SetDIBColorTable () failed\n");
        return FALSE;
    }

    /* Redraw the whole window, to take account for the new colors */
    BitBlt(pScreenPriv->hdcScreen,
           0, 0,
           pScreenInfo->dwWidth, pScreenInfo->dwHeight,
           pScreenPriv->hdcShadow, 0, 0, SRCCOPY);

    /* Save a pointer to the newly installed colormap */
    pScreenPriv->pcmapInstalled = pColormap;

#ifdef XWIN_MULTIWINDOW
    /* Redraw all windows */
    if (pScreenInfo->fMultiWindow)
        EnumThreadWindows(g_dwCurrentThreadID, winRedrawAllProcShadowGDI, 0);
#endif

    return TRUE;
}

/*
 * Store the specified colors in the specified colormap
 */

static Bool
winStoreColorsShadowGDI(ColormapPtr pColormap, int ndef, xColorItem * pdefs)
{
    ScreenPtr pScreen = pColormap->pScreen;

    winScreenPriv(pScreen);
    winCmapPriv(pColormap);
    ColormapPtr curpmap = pScreenPriv->pcmapInstalled;

    /* Put the X colormap entries into the Windows logical palette */
    if (SetPaletteEntries(pCmapPriv->hPalette,
                          pdefs[0].pixel,
                          ndef, pCmapPriv->peColors + pdefs[0].pixel) == 0) {
        ErrorF("winStoreColorsShadowGDI - SetPaletteEntries () failed\n");
        return FALSE;
    }

    /* Don't install the Windows palette if the colormap is not installed */
    if (pColormap != curpmap) {
        return TRUE;
    }

    /* Try to install the newly modified colormap */
    if (!winInstallColormapShadowGDI(pColormap)) {
        ErrorF("winInstallColormapShadowGDI - winInstallColormapShadowGDI "
               "failed\n");
        return FALSE;
    }

#if 0
    /* Tell Windows that the palette has changed */
    RealizePalette(pScreenPriv->hdcScreen);

    /* Set the DIB color table */
    if (SetDIBColorTable(pScreenPriv->hdcShadow,
                         pdefs[0].pixel,
                         ndef, pCmapPriv->rgbColors + pdefs[0].pixel) == 0) {
        ErrorF("winInstallColormapShadowGDI - SetDIBColorTable () failed\n");
        return FALSE;
    }

    /* Save a pointer to the newly installed colormap */
    pScreenPriv->pcmapInstalled = pColormap;
#endif

    return TRUE;
}

/*
 * Colormap initialization procedure
 */

static Bool
winCreateColormapShadowGDI(ColormapPtr pColormap)
{
    LPLOGPALETTE lpPaletteNew = NULL;
    DWORD dwEntriesMax;
    VisualPtr pVisual;
    HPALETTE hpalNew = NULL;

    winCmapPriv(pColormap);

    /* Get a pointer to the visual that the colormap belongs to */
    pVisual = pColormap->pVisual;

    /* Get the maximum number of palette entries for this visual */
    dwEntriesMax = pVisual->ColormapEntries;

    /* Allocate a Windows logical color palette with max entries */
    lpPaletteNew = malloc(sizeof(LOGPALETTE)
                          + (dwEntriesMax - 1) * sizeof(PALETTEENTRY));
    if (lpPaletteNew == NULL) {
        ErrorF("winCreateColormapShadowGDI - Couldn't allocate palette "
               "with %d entries\n", (int) dwEntriesMax);
        return FALSE;
    }

    /* Zero out the colormap */
    ZeroMemory(lpPaletteNew, sizeof(LOGPALETTE)
               + (dwEntriesMax - 1) * sizeof(PALETTEENTRY));

    /* Set the logical palette structure */
    lpPaletteNew->palVersion = 0x0300;
    lpPaletteNew->palNumEntries = dwEntriesMax;

    /* Tell Windows to create the palette */
    hpalNew = CreatePalette(lpPaletteNew);
    if (hpalNew == NULL) {
        ErrorF("winCreateColormapShadowGDI - CreatePalette () failed\n");
        free(lpPaletteNew);
        return FALSE;
    }

    /* Save the Windows logical palette handle in the X colormaps' privates */
    pCmapPriv->hPalette = hpalNew;

    /* Free the palette initialization memory */
    free(lpPaletteNew);

    return TRUE;
}

/*
 * Colormap destruction procedure
 */

static Bool
winDestroyColormapShadowGDI(ColormapPtr pColormap)
{
    winScreenPriv(pColormap->pScreen);
    winCmapPriv(pColormap);

    /*
     * Is colormap to be destroyed the default?
     *
     * Non-default colormaps should have had winUninstallColormap
     * called on them before we get here.  The default colormap
     * will not have had winUninstallColormap called on it.  Thus,
     * we need to handle the default colormap in a special way.
     */
    if (pColormap->flags & IsDefault) {
#if CYGDEBUG
        winDebug("winDestroyColormapShadowGDI - Destroying default "
                 "colormap\n");
#endif

        /*
         * FIXME: Walk the list of all screens, popping the default
         * palette out of each screen device context.
         */

        /* Pop the palette out of the device context */
        SelectPalette(pScreenPriv->hdcScreen,
                      GetStockObject(DEFAULT_PALETTE), FALSE);

        /* Clear our private installed colormap pointer */
        pScreenPriv->pcmapInstalled = NULL;
    }

    /* Try to delete the logical palette */
    if (DeleteObject(pCmapPriv->hPalette) == 0) {
        ErrorF("winDestroyColormap - DeleteObject () failed\n");
        return FALSE;
    }

    /* Invalidate the colormap privates */
    pCmapPriv->hPalette = NULL;

    return TRUE;
}

/*
 * Set engine specific funtions
 */

Bool
winSetEngineFunctionsShadowGDI(ScreenPtr pScreen)
{
    winScreenPriv(pScreen);
    winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;

    /* Set our pointers */
    pScreenPriv->pwinAllocateFB = winAllocateFBShadowGDI;
    pScreenPriv->pwinFreeFB = winFreeFBShadowGDI;
    pScreenPriv->pwinShadowUpdate = winShadowUpdateGDI;
    pScreenPriv->pwinInitScreen = winInitScreenShadowGDI;
    pScreenPriv->pwinCloseScreen = winCloseScreenShadowGDI;
    pScreenPriv->pwinInitVisuals = winInitVisualsShadowGDI;
    pScreenPriv->pwinAdjustVideoMode = winAdjustVideoModeShadowGDI;
    if (pScreenInfo->fFullScreen)
        pScreenPriv->pwinCreateBoundingWindow =
            winCreateBoundingWindowFullScreen;
    else
        pScreenPriv->pwinCreateBoundingWindow = winCreateBoundingWindowWindowed;
    pScreenPriv->pwinFinishScreenInit = winFinishScreenInitFB;
    pScreenPriv->pwinBltExposedRegions = winBltExposedRegionsShadowGDI;
    pScreenPriv->pwinActivateApp = winActivateAppShadowGDI;
    pScreenPriv->pwinRedrawScreen = winRedrawScreenShadowGDI;
    pScreenPriv->pwinRealizeInstalledPalette =
        winRealizeInstalledPaletteShadowGDI;
    pScreenPriv->pwinInstallColormap = winInstallColormapShadowGDI;
    pScreenPriv->pwinStoreColors = winStoreColorsShadowGDI;
    pScreenPriv->pwinCreateColormap = winCreateColormapShadowGDI;
    pScreenPriv->pwinDestroyColormap = winDestroyColormapShadowGDI;
    pScreenPriv->pwinHotKeyAltTab =
        (winHotKeyAltTabProcPtr) (void (*)(void)) NoopDDA;
    pScreenPriv->pwinCreatePrimarySurface =
        (winCreatePrimarySurfaceProcPtr) (void (*)(void)) NoopDDA;
    pScreenPriv->pwinReleasePrimarySurface =
        (winReleasePrimarySurfaceProcPtr) (void (*)(void)) NoopDDA;
#ifdef XWIN_MULTIWINDOW
    pScreenPriv->pwinFinishCreateWindowsWindow =
        (winFinishCreateWindowsWindowProcPtr) (void (*)(void)) NoopDDA;
#endif

    return TRUE;
}