summaryrefslogtreecommitdiff
path: root/vcl/source/outdev/bitmap.cxx
blob: ca736ed3db4a33f49e5a81477c0726da2da80a90 (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
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <cassert>

#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/bitmapaccess.hxx>
#include <config_features.h>
#if HAVE_FEATURE_OPENGL
#include <vcl/opengl/OpenGLHelper.hxx>
#endif
#include <vcl/outdev.hxx>
#include <vcl/virdev.hxx>
#include <vcl/image.hxx>
#include <vcl/window.hxx>

#include <bmpfast.hxx>
#include <salgdi.hxx>
#include <impbmp.hxx>
#include <image.h>

#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include <memory>
#include <comphelper/lok.hxx>

void OutputDevice::DrawBitmap( const Point& rDestPt, const Bitmap& rBitmap )
{
    assert(!is_double_buffered_window());

    const Size aSizePix( rBitmap.GetSizePixel() );
    DrawBitmap( rDestPt, PixelToLogic( aSizePix ), Point(), aSizePix, rBitmap, MetaActionType::BMP );
}

void OutputDevice::DrawBitmap( const Point& rDestPt, const Size& rDestSize, const Bitmap& rBitmap )
{
    assert(!is_double_buffered_window());

    DrawBitmap( rDestPt, rDestSize, Point(), rBitmap.GetSizePixel(), rBitmap, MetaActionType::BMPSCALE );
}


void OutputDevice::DrawBitmap( const Point& rDestPt, const Size& rDestSize,
                                   const Point& rSrcPtPixel, const Size& rSrcSizePixel,
                                   const Bitmap& rBitmap, const MetaActionType nAction )
{
    assert(!is_double_buffered_window());

    if( ImplIsRecordLayout() )
        return;

    if ( ( mnDrawMode & DrawModeFlags::NoBitmap ) )
    {
        return;
    }
    if ( RasterOp::Invert == meRasterOp )
    {
        DrawRect( Rectangle( rDestPt, rDestSize ) );
        return;
    }

    Bitmap aBmp( rBitmap );

    if ( mnDrawMode & ( DrawModeFlags::BlackBitmap | DrawModeFlags::WhiteBitmap |
                             DrawModeFlags::GrayBitmap  | DrawModeFlags::GhostedBitmap ) )
    {
        if ( mnDrawMode & ( DrawModeFlags::BlackBitmap | DrawModeFlags::WhiteBitmap ) )
        {
            sal_uInt8 cCmpVal;

            if ( mnDrawMode & DrawModeFlags::BlackBitmap )
                cCmpVal = ( mnDrawMode & DrawModeFlags::GhostedBitmap ) ? 0x80 : 0;
            else
                cCmpVal = 255;

            Color aCol( cCmpVal, cCmpVal, cCmpVal );
            Push( PushFlags::LINECOLOR | PushFlags::FILLCOLOR );
            SetLineColor( aCol );
            SetFillColor( aCol );
            DrawRect( Rectangle( rDestPt, rDestSize ) );
            Pop();
            return;
        }
        else if( !!aBmp )
        {
            if ( mnDrawMode & DrawModeFlags::GrayBitmap )
                aBmp.Convert( BMP_CONVERSION_8BIT_GREYS );

            if ( mnDrawMode & DrawModeFlags::GhostedBitmap )
                aBmp.Convert( BMP_CONVERSION_GHOSTED );
        }
    }

    if ( mpMetaFile )
    {
        switch( nAction )
        {
            case MetaActionType::BMP:
                mpMetaFile->AddAction( new MetaBmpAction( rDestPt, aBmp ) );
            break;

            case MetaActionType::BMPSCALE:
                mpMetaFile->AddAction( new MetaBmpScaleAction( rDestPt, rDestSize, aBmp ) );
            break;

            case MetaActionType::BMPSCALEPART:
                mpMetaFile->AddAction( new MetaBmpScalePartAction(
                    rDestPt, rDestSize, rSrcPtPixel, rSrcSizePixel, aBmp ) );
            break;

            default: break;
        }
    }

    if ( !IsDeviceOutputNecessary() )
        return;

    if ( !mpGraphics )
        if ( !AcquireGraphics() )
            return;

    if ( mbInitClipRegion )
        InitClipRegion();

    if ( mbOutputClipped )
        return;

    if( !aBmp.IsEmpty() )
    {
        SalTwoRect aPosAry(rSrcPtPixel.X(), rSrcPtPixel.Y(), rSrcSizePixel.Width(), rSrcSizePixel.Height(),
                           ImplLogicXToDevicePixel(rDestPt.X()), ImplLogicYToDevicePixel(rDestPt.Y()),
                           ImplLogicWidthToDevicePixel(rDestSize.Width()),
                           ImplLogicHeightToDevicePixel(rDestSize.Height()));

        if ( aPosAry.mnSrcWidth && aPosAry.mnSrcHeight && aPosAry.mnDestWidth && aPosAry.mnDestHeight )
        {
            const BmpMirrorFlags nMirrFlags = AdjustTwoRect( aPosAry, aBmp.GetSizePixel() );

            if ( nMirrFlags != BmpMirrorFlags::NONE )
                aBmp.Mirror( nMirrFlags );

            if ( aPosAry.mnSrcWidth && aPosAry.mnSrcHeight && aPosAry.mnDestWidth && aPosAry.mnDestHeight )
            {
                if ( nAction == MetaActionType::BMPSCALE )
                    ScaleBitmap (aBmp, aPosAry);

                mpGraphics->DrawBitmap( aPosAry, *aBmp.ImplGetImpBitmap()->ImplGetSalBitmap(), this );
            }
        }
    }

    if( mpAlphaVDev )
    {
        // #i32109#: Make bitmap area opaque
        mpAlphaVDev->ImplFillOpaqueRectangle( Rectangle(rDestPt, rDestSize) );
    }
}

Bitmap OutputDevice::GetDownsampledBitmap( const Size& rDstSz,
                                           const Point& rSrcPt, const Size& rSrcSz,
                                           const Bitmap& rBmp, long nMaxBmpDPIX, long nMaxBmpDPIY )
{
    Bitmap aBmp( rBmp );

    if( !aBmp.IsEmpty() )
    {
        Point           aPoint;
        const Rectangle aBmpRect( aPoint, aBmp.GetSizePixel() );
        Rectangle       aSrcRect( rSrcPt, rSrcSz );

        // do cropping if necessary
        if( aSrcRect.Intersection( aBmpRect ) != aBmpRect )
        {
            if( !aSrcRect.IsEmpty() )
                aBmp.Crop( aSrcRect );
            else
                aBmp.SetEmpty();
        }

        if( !aBmp.IsEmpty() )
        {
            // do downsampling if necessary
            Size aDstSizeTwip( PixelToLogic( LogicToPixel( rDstSz ), MapUnit::MapTwip ) );

            // #103209# Normalize size (mirroring has to happen outside of this method)
            aDstSizeTwip = Size( labs(aDstSizeTwip.Width()), labs(aDstSizeTwip.Height()) );

            const Size      aBmpSize( aBmp.GetSizePixel() );
            const double    fBmpPixelX = aBmpSize.Width();
            const double    fBmpPixelY = aBmpSize.Height();
            const double    fMaxPixelX = aDstSizeTwip.Width() * nMaxBmpDPIX / 1440.0;
            const double    fMaxPixelY = aDstSizeTwip.Height() * nMaxBmpDPIY / 1440.0;

            // check, if the bitmap DPI exceeds the maximum DPI (allow 4 pixel rounding tolerance)
            if( ( ( fBmpPixelX > ( fMaxPixelX + 4 ) ) ||
                  ( fBmpPixelY > ( fMaxPixelY + 4 ) ) ) &&
                ( fBmpPixelY > 0.0 ) && ( fMaxPixelY > 0.0 ) )
            {
                // do scaling
                Size            aNewBmpSize;
                const double    fBmpWH = fBmpPixelX / fBmpPixelY;
                const double    fMaxWH = fMaxPixelX / fMaxPixelY;

                if( fBmpWH < fMaxWH )
                {
                    aNewBmpSize.Width() = FRound( fMaxPixelY * fBmpWH );
                    aNewBmpSize.Height() = FRound( fMaxPixelY );
                }
                else if( fBmpWH > 0.0 )
                {
                    aNewBmpSize.Width() = FRound( fMaxPixelX );
                    aNewBmpSize.Height() = FRound( fMaxPixelX / fBmpWH);
                }

                if( aNewBmpSize.Width() && aNewBmpSize.Height() )
                    aBmp.Scale( aNewBmpSize );
                else
                    aBmp.SetEmpty();
            }
        }
    }

    return aBmp;
}

void OutputDevice::DrawBitmapEx( const Point& rDestPt,
                                 const BitmapEx& rBitmapEx )
{
    assert(!is_double_buffered_window());

    if( ImplIsRecordLayout() )
        return;

    if( TransparentType::NONE == rBitmapEx.GetTransparentType() )
    {
        DrawBitmap( rDestPt, rBitmapEx.GetBitmap() );
    }
    else
    {
        const Size aSizePix( rBitmapEx.GetSizePixel() );
        DrawBitmapEx( rDestPt, PixelToLogic( aSizePix ), Point(), aSizePix, rBitmapEx, MetaActionType::BMPEX );
    }
}

void OutputDevice::DrawBitmapEx( const Point& rDestPt, const Size& rDestSize,
                                 const BitmapEx& rBitmapEx )
{
    assert(!is_double_buffered_window());

    if( ImplIsRecordLayout() )
        return;

    if ( TransparentType::NONE == rBitmapEx.GetTransparentType() )
    {
        DrawBitmap( rDestPt, rDestSize, rBitmapEx.GetBitmap() );
    }
    else
    {
        DrawBitmapEx( rDestPt, rDestSize, Point(), rBitmapEx.GetSizePixel(), rBitmapEx, MetaActionType::BMPEXSCALE );
    }
}


void OutputDevice::DrawBitmapEx( const Point& rDestPt, const Size& rDestSize,
                                 const Point& rSrcPtPixel, const Size& rSrcSizePixel,
                                 const BitmapEx& rBitmapEx, const MetaActionType nAction )
{
    assert(!is_double_buffered_window());

    if( ImplIsRecordLayout() )
        return;

    if( TransparentType::NONE == rBitmapEx.GetTransparentType() )
    {
        DrawBitmap( rDestPt, rDestSize, rSrcPtPixel, rSrcSizePixel, rBitmapEx.GetBitmap() );
    }
    else
    {
        if ( mnDrawMode & DrawModeFlags::NoBitmap )
            return;

        if ( RasterOp::Invert == meRasterOp )
        {
            DrawRect( Rectangle( rDestPt, rDestSize ) );
            return;
        }

        BitmapEx aBmpEx( rBitmapEx );

        if ( mnDrawMode & ( DrawModeFlags::BlackBitmap | DrawModeFlags::WhiteBitmap |
                                 DrawModeFlags::GrayBitmap | DrawModeFlags::GhostedBitmap ) )
        {
            if ( mnDrawMode & ( DrawModeFlags::BlackBitmap | DrawModeFlags::WhiteBitmap ) )
            {
                Bitmap  aColorBmp( aBmpEx.GetSizePixel(), ( mnDrawMode & DrawModeFlags::GhostedBitmap ) ? 4 : 1 );
                sal_uInt8   cCmpVal;

                if ( mnDrawMode & DrawModeFlags::BlackBitmap )
                    cCmpVal = ( mnDrawMode & DrawModeFlags::GhostedBitmap ) ? 0x80 : 0;
                else
                    cCmpVal = 255;

                aColorBmp.Erase( Color( cCmpVal, cCmpVal, cCmpVal ) );

                if( aBmpEx.IsAlpha() )
                {
                    // Create one-bit mask out of alpha channel, by
                    // thresholding it at alpha=0.5. As
                    // DRAWMODE_BLACK/WHITEBITMAP requires monochrome
                    // output, having alpha-induced grey levels is not
                    // acceptable.
                    Bitmap aMask( aBmpEx.GetAlpha().GetBitmap() );
                    aMask.MakeMono( 129 );
                    aBmpEx = BitmapEx( aColorBmp, aMask );
                }
                else
                {
                    aBmpEx = BitmapEx( aColorBmp, aBmpEx.GetMask() );
                }
            }
            else if( !!aBmpEx )
            {
                if ( mnDrawMode & DrawModeFlags::GrayBitmap )
                    aBmpEx.Convert( BMP_CONVERSION_8BIT_GREYS );

                if ( mnDrawMode & DrawModeFlags::GhostedBitmap )
                    aBmpEx.Convert( BMP_CONVERSION_GHOSTED );
            }
        }

        if ( mpMetaFile )
        {
            switch( nAction )
            {
                case MetaActionType::BMPEX:
                    mpMetaFile->AddAction( new MetaBmpExAction( rDestPt, aBmpEx ) );
                break;

                case MetaActionType::BMPEXSCALE:
                    mpMetaFile->AddAction( new MetaBmpExScaleAction( rDestPt, rDestSize, aBmpEx ) );
                break;

                case MetaActionType::BMPEXSCALEPART:
                    mpMetaFile->AddAction( new MetaBmpExScalePartAction( rDestPt, rDestSize,
                                                                         rSrcPtPixel, rSrcSizePixel, aBmpEx ) );
                break;

                default: break;
            }
        }

        if ( !IsDeviceOutputNecessary() )
            return;

        if ( !mpGraphics )
            if ( !AcquireGraphics() )
                return;

        if ( mbInitClipRegion )
            InitClipRegion();

        if ( mbOutputClipped )
            return;

        DrawDeviceBitmap( rDestPt, rDestSize, rSrcPtPixel, rSrcSizePixel, aBmpEx );
    }
}

Bitmap OutputDevice::GetBitmap( const Point& rSrcPt, const Size& rSize ) const
{
    Bitmap  aBmp;
    long    nX = ImplLogicXToDevicePixel( rSrcPt.X() );
    long    nY = ImplLogicYToDevicePixel( rSrcPt.Y() );
    long    nWidth = ImplLogicWidthToDevicePixel( rSize.Width() );
    long    nHeight = ImplLogicHeightToDevicePixel( rSize.Height() );

    if ( mpGraphics || AcquireGraphics() )
    {
        if ( nWidth > 0 && nHeight  > 0 && nX <= (mnOutWidth + mnOutOffX) && nY <= (mnOutHeight + mnOutOffY))
        {
            Rectangle   aRect( Point( nX, nY ), Size( nWidth, nHeight ) );
            bool        bClipped = false;

            // X-Coordinate outside of draw area?
            if ( nX < mnOutOffX )
            {
                nWidth -= ( mnOutOffX - nX );
                nX = mnOutOffX;
                bClipped = true;
            }

            // Y-Coordinate outside of draw area?
            if ( nY < mnOutOffY )
            {
                nHeight -= ( mnOutOffY - nY );
                nY = mnOutOffY;
                bClipped = true;
            }

            // Width outside of draw area?
            if ( (nWidth + nX) > (mnOutWidth + mnOutOffX) )
            {
                nWidth  = mnOutOffX + mnOutWidth - nX;
                bClipped = true;
            }

            // Height outside of draw area?
            if ( (nHeight + nY) > (mnOutHeight + mnOutOffY) )
            {
                nHeight = mnOutOffY + mnOutHeight - nY;
                bClipped = true;
            }

            if ( bClipped )
            {
                // If the visible part has been clipped, we have to create a
                // Bitmap with the correct size in which we copy the clipped
                // Bitmap to the correct position.
                ScopedVclPtrInstance< VirtualDevice > aVDev(  *this  );

                if ( aVDev->SetOutputSizePixel( aRect.GetSize() ) )
                {
                    if ( static_cast<OutputDevice*>(aVDev.get())->mpGraphics || static_cast<OutputDevice*>(aVDev.get())->AcquireGraphics() )
                    {
                        if ( (nWidth > 0) && (nHeight > 0) )
                        {
                            SalTwoRect aPosAry(nX, nY, nWidth, nHeight,
                                              (aRect.Left() < mnOutOffX) ? (mnOutOffX - aRect.Left()) : 0L,
                                              (aRect.Top() < mnOutOffY) ? (mnOutOffY - aRect.Top()) : 0L,
                                              nWidth, nHeight);
                            (static_cast<OutputDevice*>(aVDev.get())->mpGraphics)->CopyBits( aPosAry, mpGraphics, this, this );
                        }
                        else
                        {
                            OSL_ENSURE(false, "CopyBits with zero or negative width or height");
                        }

                        aBmp = aVDev->GetBitmap( Point(), aVDev->GetOutputSizePixel() );
                     }
                     else
                        bClipped = false;
                }
                else
                    bClipped = false;
            }

            if ( !bClipped )
            {
                SalBitmap* pSalBmp = mpGraphics->GetBitmap( nX, nY, nWidth, nHeight, this );

                if( pSalBmp )
                {
                    std::shared_ptr<ImpBitmap> xImpBmp(new ImpBitmap(pSalBmp));
                    aBmp.ImplSetImpBitmap(xImpBmp);
                }
            }
        }
    }

    return aBmp;
}

BitmapEx OutputDevice::GetBitmapEx( const Point& rSrcPt, const Size& rSize ) const
{

    // #110958# Extract alpha value from VDev, if any
    if( mpAlphaVDev )
    {
        Bitmap aAlphaBitmap( mpAlphaVDev->GetBitmap( rSrcPt, rSize ) );

        // ensure 8 bit alpha
        if( aAlphaBitmap.GetBitCount() > 8 )
            aAlphaBitmap.Convert( BMP_CONVERSION_8BIT_GREYS );

        return BitmapEx(GetBitmap( rSrcPt, rSize ), AlphaMask( aAlphaBitmap ) );
    }
    else
        return GetBitmap( rSrcPt, rSize );
}

void OutputDevice::DrawDeviceBitmap( const Point& rDestPt, const Size& rDestSize,
                                     const Point& rSrcPtPixel, const Size& rSrcSizePixel,
                                     BitmapEx& rBitmapEx )
{
    assert(!is_double_buffered_window());

    if (rBitmapEx.IsAlpha())
    {
        DrawDeviceAlphaBitmap(rBitmapEx.GetBitmap(), rBitmapEx.GetAlpha(), rDestPt, rDestSize, rSrcPtPixel, rSrcSizePixel);
    }
    else if (!!rBitmapEx)
    {
        SalTwoRect aPosAry(rSrcPtPixel.X(), rSrcPtPixel.Y(), rSrcSizePixel.Width(), rSrcSizePixel.Height(),
                           ImplLogicXToDevicePixel(rDestPt.X()), ImplLogicYToDevicePixel(rDestPt.Y()),
                           ImplLogicWidthToDevicePixel(rDestSize.Width()),
                           ImplLogicHeightToDevicePixel(rDestSize.Height()));

        const BmpMirrorFlags nMirrFlags = AdjustTwoRect(aPosAry, rBitmapEx.GetSizePixel());

        if (aPosAry.mnSrcWidth && aPosAry.mnSrcHeight && aPosAry.mnDestWidth && aPosAry.mnDestHeight)
        {

            if (nMirrFlags != BmpMirrorFlags::NONE)
                rBitmapEx.Mirror(nMirrFlags);

            const SalBitmap* pSalSrcBmp = rBitmapEx.ImplGetBitmapImpBitmap()->ImplGetSalBitmap();
            std::shared_ptr<ImpBitmap> xMaskBmp = rBitmapEx.ImplGetMaskImpBitmap();

            if (xMaskBmp)
            {
                SalBitmap* pSalAlphaBmp = xMaskBmp->ImplGetSalBitmap();
                bool bTryDirectPaint(pSalSrcBmp && pSalAlphaBmp);

                if (bTryDirectPaint && mpGraphics->DrawAlphaBitmap(aPosAry, *pSalSrcBmp, *pSalAlphaBmp, this))
                {
                    // tried to paint as alpha directly. If tis worked, we are done (except
                    // alpha, see below)
                }
                else
                {
                    // #4919452# reduce operation area to bounds of
                    // cliprect. since masked transparency involves
                    // creation of a large vdev and copying the screen
                    // content into that (slooow read from framebuffer),
                    // that should considerably increase performance for
                    // large bitmaps and small clippings.

                    // Note that this optimization is a workaround for a
                    // Writer peculiarity, namely, to decompose background
                    // graphics into myriads of disjunct, tiny
                    // rectangles. That otherwise kills us here, since for
                    // transparent output, SAL always prepares the whole
                    // bitmap, if aPosAry contains the whole bitmap (and
                    // it's _not_ to blame for that).

                    // Note the call to ImplPixelToDevicePixel(), since
                    // aPosAry already contains the mnOutOff-offsets, they
                    // also have to be applied to the region
                    Rectangle aClipRegionBounds( ImplPixelToDevicePixel(maRegion).GetBoundRect() );

                    // TODO: Also respect scaling (that's a bit tricky,
                    // since the source points have to move fractional
                    // amounts (which is not possible, thus has to be
                    // emulated by increases copy area)
                    // const double nScaleX( aPosAry.mnDestWidth / aPosAry.mnSrcWidth );
                    // const double nScaleY( aPosAry.mnDestHeight / aPosAry.mnSrcHeight );

                    // for now, only identity scales allowed
                    if (!aClipRegionBounds.IsEmpty() &&
                        aPosAry.mnDestWidth == aPosAry.mnSrcWidth &&
                        aPosAry.mnDestHeight == aPosAry.mnSrcHeight)
                    {
                        // now intersect dest rect with clip region
                        aClipRegionBounds.Intersection(Rectangle(aPosAry.mnDestX,
                                                                 aPosAry.mnDestY,
                                                                 aPosAry.mnDestX + aPosAry.mnDestWidth - 1,
                                                                 aPosAry.mnDestY + aPosAry.mnDestHeight - 1));

                        // Note: I could theoretically optimize away the
                        // DrawBitmap below, if the region is empty
                        // here. Unfortunately, cannot rule out that
                        // somebody relies on the side effects.
                        if (!aClipRegionBounds.IsEmpty())
                        {
                            aPosAry.mnSrcX += aClipRegionBounds.Left() - aPosAry.mnDestX;
                            aPosAry.mnSrcY += aClipRegionBounds.Top() - aPosAry.mnDestY;
                            aPosAry.mnSrcWidth = aClipRegionBounds.GetWidth();
                            aPosAry.mnSrcHeight = aClipRegionBounds.GetHeight();

                            aPosAry.mnDestX = aClipRegionBounds.Left();
                            aPosAry.mnDestY = aClipRegionBounds.Top();
                            aPosAry.mnDestWidth = aClipRegionBounds.GetWidth();
                            aPosAry.mnDestHeight = aClipRegionBounds.GetHeight();
                        }
                    }

                    mpGraphics->DrawBitmap(aPosAry, *pSalSrcBmp,
                                           *xMaskBmp->ImplGetSalBitmap(),
                                           this);
                }

                // #110958# Paint mask to alpha channel. Luckily, the
                // black and white representation of the mask maps to
                // the alpha channel

                // #i25167# Restrict mask painting to _opaque_ areas
                // of the mask, otherwise we spoil areas where no
                // bitmap content was ever visible. Interestingly
                // enough, this can be achieved by taking the mask as
                // the transparency mask of itself
                if (mpAlphaVDev)
                    mpAlphaVDev->DrawBitmapEx(rDestPt,
                                              rDestSize,
                                              BitmapEx(rBitmapEx.GetMask(),
                                                       rBitmapEx.GetMask()));
            }
            else
            {
                mpGraphics->DrawBitmap(aPosAry, *pSalSrcBmp, this);

                if (mpAlphaVDev)
                {
                    // #i32109#: Make bitmap area opaque
                    mpAlphaVDev->ImplFillOpaqueRectangle( Rectangle(rDestPt, rDestSize) );
                }
            }
        }
    }
}

void OutputDevice::DrawDeviceAlphaBitmap( const Bitmap& rBmp, const AlphaMask& rAlpha,
                                    const Point& rDestPt, const Size& rDestSize,
                                    const Point& rSrcPtPixel, const Size& rSrcSizePixel )
{
    assert(!is_double_buffered_window());

    Point     aOutPt(LogicToPixel(rDestPt));
    Size      aOutSz(LogicToPixel(rDestSize));
    Rectangle aDstRect(Point(), GetOutputSizePixel());

    const bool bHMirr = aOutSz.Width() < 0;
    const bool bVMirr = aOutSz.Height() < 0;

    ClipToPaintRegion(aDstRect);

    if (bHMirr)
    {
        aOutSz.Width() = -aOutSz.Width();
        aOutPt.X() -= aOutSz.Width() - 1L;
    }

    if (bVMirr)
    {
        aOutSz.Height() = -aOutSz.Height();
        aOutPt.Y() -= aOutSz.Height() - 1L;
    }

    if (!aDstRect.Intersection(Rectangle(aOutPt, aOutSz)).IsEmpty())
    {
        static const char* pDisableNative = getenv( "SAL_DISABLE_NATIVE_ALPHA");
        // #i83087# Naturally, system alpha blending cannot work with
        // separate alpha VDev
        bool bTryDirectPaint(!pDisableNative && !bHMirr && !bVMirr);

        if (bTryDirectPaint)
        {
            Point aRelPt = aOutPt + Point(mnOutOffX, mnOutOffY);
            SalTwoRect aTR(
                rSrcPtPixel.X(), rSrcPtPixel.Y(),
                rSrcSizePixel.Width(), rSrcSizePixel.Height(),
                aRelPt.X(), aRelPt.Y(),
                aOutSz.Width(), aOutSz.Height());

            SalBitmap* pSalSrcBmp = rBmp.ImplGetImpBitmap()->ImplGetSalBitmap();
            SalBitmap* pSalAlphaBmp = rAlpha.ImplGetImpBitmap()->ImplGetSalBitmap();

            // try to blend the alpha bitmap with the alpha virtual device
            if (mpAlphaVDev)
            {
                Bitmap aAlphaBitmap( mpAlphaVDev->GetBitmap( aRelPt, aOutSz ) );
                if (aAlphaBitmap.ImplGetImpBitmap())
                {
                    SalBitmap* pSalAlphaBmp2 = aAlphaBitmap.ImplGetImpBitmap()->ImplGetSalBitmap();
                    if (mpGraphics->BlendAlphaBitmap(aTR, *pSalSrcBmp, *pSalAlphaBmp, *pSalAlphaBmp2, this))
                    {
                        mpAlphaVDev->BlendBitmap(aTR, rAlpha);
                        return;
                    }
                }
            }
            else
            {
                if (mpGraphics->DrawAlphaBitmap(aTR, *pSalSrcBmp, *pSalAlphaBmp, this))
                    return;
            }
        }

        // we need to make sure OpenGL never reaches this slow code path

#if HAVE_FEATURE_OPENGL
        assert(!OpenGLHelper::isVCLOpenGLEnabled());
#endif
        Rectangle aBmpRect(Point(), rBmp.GetSizePixel());
        if (!aBmpRect.Intersection(Rectangle(rSrcPtPixel, rSrcSizePixel)).IsEmpty())
        {
            Point     auxOutPt(LogicToPixel(rDestPt));
            Size      auxOutSz(LogicToPixel(rDestSize));

            DrawDeviceAlphaBitmapSlowPath(rBmp, rAlpha, aDstRect, aBmpRect, auxOutSz, auxOutPt);
        }
    }
}

namespace
{

struct LinearScaleContext
{
    std::unique_ptr<long[]> mpMapX;
    std::unique_ptr<long[]> mpMapY;

    std::unique_ptr<long[]> mpMapXOffset;
    std::unique_ptr<long[]> mpMapYOffset;

    LinearScaleContext(Rectangle& aDstRect, Rectangle& aBitmapRect,
                 Size& aOutSize, long nOffX, long nOffY)

        : mpMapX(new long[aDstRect.GetWidth()])
        , mpMapY(new long[aDstRect.GetHeight()])
        , mpMapXOffset(new long[aDstRect.GetWidth()])
        , mpMapYOffset(new long[aDstRect.GetHeight()])
    {
        const long nSrcWidth = aBitmapRect.GetWidth();
        const long nSrcHeight = aBitmapRect.GetHeight();

        generateSimpleMap(
            nSrcWidth,  aDstRect.GetWidth(), aBitmapRect.Left(),
            aOutSize.Width(),  nOffX, mpMapX.get(), mpMapXOffset.get());

        generateSimpleMap(
            nSrcHeight, aDstRect.GetHeight(), aBitmapRect.Top(),
            aOutSize.Height(), nOffY, mpMapY.get(), mpMapYOffset.get());
    }

private:

    static void generateSimpleMap(long nSrcDimension, long nDstDimension, long nDstLocation,
                                  long nOutDimention, long nOffset, long* pMap, long* pMapOffset)
    {

        const double fReverseScale = (std::abs(nOutDimention) > 1L) ? (nSrcDimension - 1L) / double(std::abs(nOutDimention) - 1L) : 0.0;

        long nSampleRange = std::max(0L, nSrcDimension - 2L);

        for (long i = 0L; i < nDstDimension; i++)
        {
            double fTemp = std::abs((nOffset + i) * fReverseScale);

            pMap[i] = MinMax(nDstLocation + long(fTemp), 0, nSampleRange);
            pMapOffset[i] = (long) ((fTemp - pMap[i]) * 128.0);
        }
    }

public:
    bool blendBitmap(
            const BitmapWriteAccess* pDestination,
            const BitmapReadAccess*  pSource,
            const BitmapReadAccess*  pSourceAlpha,
            const long nDstWidth,
            const long nDstHeight)
    {
        if (pSource && pSourceAlpha && pDestination)
        {
            ScanlineFormat nSourceFormat = pSource->GetScanlineFormat();
            ScanlineFormat nDestinationFormat = pDestination->GetScanlineFormat();

            switch (nSourceFormat)
            {
                case ScanlineFormat::N24BitTcRgb:
                case ScanlineFormat::N24BitTcBgr:
                {
                    if ( (nSourceFormat == ScanlineFormat::N24BitTcBgr && nDestinationFormat == ScanlineFormat::N32BitTcBgra)
                      || (nSourceFormat == ScanlineFormat::N24BitTcRgb && nDestinationFormat == ScanlineFormat::N32BitTcRgba))
                    {
                        blendBitmap24(pDestination, pSource, pSourceAlpha, nDstWidth, nDstHeight);
                        return true;
                    }
                }
                break;
                default: break;
            }
        }
        return false;
    }

    void blendBitmap24(
            const BitmapWriteAccess*  pDestination,
            const BitmapReadAccess*   pSource,
            const BitmapReadAccess*   pSourceAlpha,
            const long nDstWidth,
            const long nDstHeight)
    {
        Scanline pLine0, pLine1;
        Scanline pLineAlpha0, pLineAlpha1;
        Scanline pColorSample1, pColorSample2;
        Scanline pDestScanline;

        long nColor1Line1, nColor2Line1, nColor3Line1;
        long nColor1Line2, nColor2Line2, nColor3Line2;
        long nAlphaLine1, nAlphaLine2;

        sal_uInt8 nColor1, nColor2, nColor3, nAlpha;

        for (long nY = 0L; nY < nDstHeight; nY++)
        {
            const long nMapY  = mpMapY[nY];
            const long nMapFY = mpMapYOffset[nY];

            pLine0 = pSource->GetScanline(nMapY);
            // tdf#95481 guard nMapY + 1 to be within bounds
            pLine1 = (nMapY + 1 < pSource->Height()) ? pSource->GetScanline(nMapY + 1) : pLine0;

            pLineAlpha0 = pSourceAlpha->GetScanline(nMapY);
            // tdf#95481 guard nMapY + 1 to be within bounds
            pLineAlpha1 = (nMapY + 1 < pSourceAlpha->Height()) ? pSourceAlpha->GetScanline(nMapY + 1) : pLineAlpha0;

            pDestScanline = pDestination->GetScanline(nY);

            for (long nX = 0L; nX < nDstWidth; nX++)
            {
                const long nMapX = mpMapX[nX];
                const long nMapFX = mpMapXOffset[nX];

                pColorSample1 = pLine0 + 3L * nMapX;
                pColorSample2 = (nMapX + 1 < pSource->Width()) ? pColorSample1 + 3L : pColorSample1;
                nColor1Line1 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                pColorSample1++;
                pColorSample2++;
                nColor2Line1 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                pColorSample1++;
                pColorSample2++;
                nColor3Line1 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                pColorSample1 = pLine1 + 3L * nMapX;
                pColorSample2 = (nMapX + 1 < pSource->Width()) ? pColorSample1 + 3L : pColorSample1;
                nColor1Line2 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                pColorSample1++;
                pColorSample2++;
                nColor2Line2 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                pColorSample1++;
                pColorSample2++;
                nColor3Line2 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                pColorSample1 = pLineAlpha0 + nMapX;
                pColorSample2 = (nMapX + 1 < pSourceAlpha->Width()) ? pColorSample1 + 1L : pColorSample1;
                nAlphaLine1 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                pColorSample1 = pLineAlpha1 + nMapX;
                pColorSample2 = (nMapX + 1 < pSourceAlpha->Width()) ? pColorSample1 + 1L : pColorSample1;
                nAlphaLine2 = (static_cast<long>(*pColorSample1) << 7) + nMapFX * (static_cast<long>(*pColorSample2) - *pColorSample1);

                nColor1 = (nColor1Line1 + nMapFY * ((nColor1Line2 >> 7) - (nColor1Line1 >> 7))) >> 7;
                nColor2 = (nColor2Line1 + nMapFY * ((nColor2Line2 >> 7) - (nColor2Line1 >> 7))) >> 7;
                nColor3 = (nColor3Line1 + nMapFY * ((nColor3Line2 >> 7) - (nColor3Line1 >> 7))) >> 7;

                nAlpha  = (nAlphaLine1  + nMapFY * ((nAlphaLine2  >> 7) - (nAlphaLine1 >> 7))) >> 7;

                *pDestScanline = COLOR_CHANNEL_MERGE(*pDestScanline, nColor1, nAlpha);
                pDestScanline++;
                *pDestScanline = COLOR_CHANNEL_MERGE(*pDestScanline, nColor2, nAlpha);
                pDestScanline++;
                *pDestScanline = COLOR_CHANNEL_MERGE(*pDestScanline, nColor3, nAlpha);
                pDestScanline++;
                pDestScanline++;
            }
        }
    }
};

struct TradScaleContext
{
    std::unique_ptr<long[]> mpMapX;
    std::unique_ptr<long[]> mpMapY;

    TradScaleContext(Rectangle& aDstRect, Rectangle& aBitmapRect,
                 Size& aOutSize, long nOffX, long nOffY)

        : mpMapX(new long[aDstRect.GetWidth()])
        , mpMapY(new long[aDstRect.GetHeight()])
    {
        const long nSrcWidth = aBitmapRect.GetWidth();
        const long nSrcHeight = aBitmapRect.GetHeight();

        const bool bHMirr = aOutSize.Width() < 0;
        const bool bVMirr = aOutSize.Height() < 0;

        generateSimpleMap(
            nSrcWidth, aDstRect.GetWidth(), aBitmapRect.Left(),
            aOutSize.Width(), nOffX, bHMirr, mpMapX.get());

        generateSimpleMap(
            nSrcHeight, aDstRect.GetHeight(), aBitmapRect.Top(),
            aOutSize.Height(), nOffY, bVMirr, mpMapY.get());
    }

private:

    static void generateSimpleMap(long nSrcDimension, long nDstDimension, long nDstLocation,
                                  long nOutDimention, long nOffset, bool bMirror, long* pMap)
    {
        long nMirrorOffset = 0;

        if (bMirror)
            nMirrorOffset = (nDstLocation << 1) + nSrcDimension - 1L;

        for (long i = 0L; i < nDstDimension; ++i, ++nOffset)
        {
            pMap[i] = nDstLocation + nOffset * nSrcDimension / nOutDimention;
            if (bMirror)
                pMap[i] = nMirrorOffset - pMap[i];
        }
    }
};


} // end anonymous namespace

void OutputDevice::DrawDeviceAlphaBitmapSlowPath(const Bitmap& rBitmap, const AlphaMask& rAlpha, Rectangle aDstRect, Rectangle aBmpRect, Size& aOutSize, Point& aOutPoint)
{
    assert(!is_double_buffered_window());

    VirtualDevice* pOldVDev = mpAlphaVDev;

    const bool  bHMirr = aOutSize.Width() < 0;
    const bool  bVMirr = aOutSize.Height() < 0;

    // The scaling in this code path produces really ugly results - it
    // does the most trivial scaling with no smoothing.
    GDIMetaFile* pOldMetaFile = mpMetaFile;
    const bool   bOldMap = mbMap;

    mpMetaFile = nullptr; // fdo#55044 reset before GetBitmap!
    mbMap = false;

    Bitmap aBmp(GetBitmap(aDstRect.TopLeft(), aDstRect.GetSize()));

    // #109044# The generated bitmap need not necessarily be
    // of aDstRect dimensions, it's internally clipped to
    // window bounds. Thus, we correct the dest size here,
    // since we later use it (in nDstWidth/Height) for pixel
    // access)
    // #i38887# reading from screen may sometimes fail
    if (aBmp.ImplGetImpBitmap())
    {
        aDstRect.SetSize(aBmp.GetSizePixel());
    }

    const long nDstWidth = aDstRect.GetWidth();
    const long nDstHeight = aDstRect.GetHeight();

    // calculate offset in original bitmap
    // in RTL case this is a little more complicated since the contents of the
    // bitmap is not mirrored (it never is), however the paint region and bmp region
    // are in mirrored coordinates, so the intersection of (aOutPt,aOutSz) with these
    // is content wise somewhere else and needs to take mirroring into account
    const long nOffX = IsRTLEnabled()
                            ? aOutSize.Width() - aDstRect.GetWidth() - (aDstRect.Left() - aOutPoint.X())
                            : aDstRect.Left() - aOutPoint.X();

    const long nOffY = aDstRect.Top() - aOutPoint.Y();

    TradScaleContext aTradContext(aDstRect, aBmpRect, aOutSize, nOffX, nOffY);

    Bitmap::ScopedReadAccess pBitmapReadAccess(const_cast<Bitmap&>(rBitmap));
    AlphaMask::ScopedReadAccess pAlphaReadAccess(const_cast<AlphaMask&>(rAlpha));

    DBG_ASSERT( pAlphaReadAccess->GetScanlineFormat() == ScanlineFormat::N8BitPal ||
                pAlphaReadAccess->GetScanlineFormat() == ScanlineFormat::N8BitTcMask,
                "OutputDevice::ImplDrawAlpha(): non-8bit alpha no longer supported!" );

    // #i38887# reading from screen may sometimes fail
    if (aBmp.ImplGetImpBitmap())
    {
        Bitmap aNewBitmap;

        if (mpAlphaVDev)
        {
            aNewBitmap = BlendBitmapWithAlpha(
                            aBmp, pBitmapReadAccess.get(), pAlphaReadAccess.get(),
                            aDstRect,
                            nOffY, nDstHeight,
                            nOffX, nDstWidth,
                            aTradContext.mpMapX.get(), aTradContext.mpMapY.get() );
        }
        else
        {
            LinearScaleContext aLinearContext(aDstRect, aBmpRect, aOutSize, nOffX, nOffY);

            if (aLinearContext.blendBitmap( Bitmap::ScopedWriteAccess(aBmp).get(), pBitmapReadAccess.get(), pAlphaReadAccess.get(),
                    nDstWidth, nDstHeight))
            {
                aNewBitmap = aBmp;
            }
            else
            {
                aNewBitmap = BlendBitmap(
                            aBmp, pBitmapReadAccess.get(), pAlphaReadAccess.get(),
                            nOffY, nDstHeight,
                            nOffX, nDstWidth,
                            aBmpRect, aOutSize,
                            bHMirr, bVMirr,
                            aTradContext.mpMapX.get(), aTradContext.mpMapY.get() );
            }
        }

        // #110958# Disable alpha VDev, we're doing the necessary
        // stuff explicitly further below
        if (mpAlphaVDev)
            mpAlphaVDev = nullptr;

        DrawBitmap(aDstRect.TopLeft(), aNewBitmap);

        // #110958# Enable alpha VDev again
        mpAlphaVDev = pOldVDev;
    }

    mbMap = bOldMap;
    mpMetaFile = pOldMetaFile;
}

void OutputDevice::ScaleBitmap (Bitmap &rBmp, SalTwoRect &rPosAry)
{
    const double nScaleX = rPosAry.mnDestWidth  / static_cast<double>( rPosAry.mnSrcWidth );
    const double nScaleY = rPosAry.mnDestHeight / static_cast<double>( rPosAry.mnSrcHeight );

    // If subsampling, use Bitmap::Scale for subsampling for better quality.
    if ( nScaleX < 1.0 || nScaleY < 1.0 )
    {
        rBmp.Scale ( nScaleX, nScaleY );
        rPosAry.mnSrcWidth = rPosAry.mnDestWidth;
        rPosAry.mnSrcHeight = rPosAry.mnDestHeight;
    }
}

bool OutputDevice::DrawTransformBitmapExDirect(
        const basegfx::B2DHomMatrix& aFullTransform,
        const BitmapEx& rBitmapEx)
{
    assert(!is_double_buffered_window());

    bool bDone = false;

    // try to paint directly
    const basegfx::B2DPoint aNull(aFullTransform * basegfx::B2DPoint(0.0, 0.0));
    const basegfx::B2DPoint aTopX(aFullTransform * basegfx::B2DPoint(1.0, 0.0));
    const basegfx::B2DPoint aTopY(aFullTransform * basegfx::B2DPoint(0.0, 1.0));
    SalBitmap* pSalSrcBmp = rBitmapEx.GetBitmap().ImplGetImpBitmap()->ImplGetSalBitmap();
    SalBitmap* pSalAlphaBmp = nullptr;

    if(rBitmapEx.IsTransparent())
    {
        if(rBitmapEx.IsAlpha())
        {
            pSalAlphaBmp = rBitmapEx.GetAlpha().ImplGetImpBitmap()->ImplGetSalBitmap();
        }
        else
        {
            pSalAlphaBmp = rBitmapEx.GetMask().ImplGetImpBitmap()->ImplGetSalBitmap();
        }
    }

    bDone = mpGraphics->DrawTransformedBitmap(
        aNull,
        aTopX,
        aTopY,
        *pSalSrcBmp,
        pSalAlphaBmp,
        this);

    return bDone;
};

bool OutputDevice::TransformAndReduceBitmapExToTargetRange(
        const basegfx::B2DHomMatrix& aFullTransform,
        basegfx::B2DRange &aVisibleRange,
        double &fMaximumArea)
{
    // limit TargetRange to existing pixels (if pixel device)
    // first get discrete range of object
    basegfx::B2DRange aFullPixelRange(aVisibleRange);

    aFullPixelRange.transform(aFullTransform);

    if(basegfx::fTools::equalZero(aFullPixelRange.getWidth()) || basegfx::fTools::equalZero(aFullPixelRange.getHeight()))
    {
        // object is outside of visible area
        return false;
    }

    // now get discrete target pixels; start with OutDev pixel size and evtl.
    // intersect with active clipping area
    basegfx::B2DRange aOutPixel(
        0.0,
        0.0,
        GetOutputSizePixel().Width(),
        GetOutputSizePixel().Height());

    if(IsClipRegion())
    {
        const Rectangle aRegionRectangle(GetActiveClipRegion().GetBoundRect());

        aOutPixel.intersect( // caution! Range from rectangle, one too much (!)
            basegfx::B2DRange(
                aRegionRectangle.Left(),
                aRegionRectangle.Top(),
                aRegionRectangle.Right() + 1,
                aRegionRectangle.Bottom() + 1));
    }

    if(aOutPixel.isEmpty())
    {
        // no active output area
        return false;
    }

    // if aFullPixelRange is not completely inside of aOutPixel,
    // reduction of target pixels is possible
    basegfx::B2DRange aVisiblePixelRange(aFullPixelRange);

    if(!aOutPixel.isInside(aFullPixelRange))
    {
        aVisiblePixelRange.intersect(aOutPixel);

        if(aVisiblePixelRange.isEmpty())
        {
            // nothing in visible part, reduces to nothing
            return false;
        }

        // aVisiblePixelRange contains the reduced output area in
        // discrete coordinates. To make it useful everywhere, make it relative to
        // the object range
        basegfx::B2DHomMatrix aMakeVisibleRangeRelative;

        aVisibleRange = aVisiblePixelRange;
        aMakeVisibleRangeRelative.translate(
            -aFullPixelRange.getMinX(),
            -aFullPixelRange.getMinY());
        aMakeVisibleRangeRelative.scale(
            1.0 / aFullPixelRange.getWidth(),
            1.0 / aFullPixelRange.getHeight());
        aVisibleRange.transform(aMakeVisibleRangeRelative);
    }

    // for pixel devices, do *not* limit size, else OutputDevice::DrawDeviceAlphaBitmap
    // will create another, badly scaled bitmap to do the job. Nonetheless, do a
    // maximum clipping of something big (1600x1280x2). Add 1.0 to avoid rounding
    // errors in rough estimations
    const double fNewMaxArea(aVisiblePixelRange.getWidth() * aVisiblePixelRange.getHeight());

    fMaximumArea = std::min(4096000.0, fNewMaxArea + 1.0);

    return true;
}

void OutputDevice::DrawTransformedBitmapEx(
    const basegfx::B2DHomMatrix& rTransformation,
    const BitmapEx& rBitmapEx)
{
    assert(!is_double_buffered_window());

    if( ImplIsRecordLayout() )
        return;

    if(rBitmapEx.IsEmpty())
        return;

    if ( mnDrawMode & DrawModeFlags::NoBitmap )
        return;

    // decompose matrix to check rotation and shear
    basegfx::B2DVector aScale, aTranslate;
    double fRotate, fShearX;
    rTransformation.decompose(aScale, aTranslate, fRotate, fShearX);
    const bool bRotated(!basegfx::fTools::equalZero(fRotate));
    const bool bSheared(!basegfx::fTools::equalZero(fShearX));
    const bool bMirroredX(basegfx::fTools::less(aScale.getX(), 0.0));
    const bool bMirroredY(basegfx::fTools::less(aScale.getY(), 0.0));

    static bool bForceToOwnTransformer(false);

    if(!bForceToOwnTransformer && !bRotated && !bSheared && !bMirroredX && !bMirroredY)
    {
        // with no rotation, shear or mirroring it can be mapped to DrawBitmapEx
        // do *not* execute the mirroring here, it's done in the fallback
        // #i124580# the correct DestSize needs to be calculated based on MaxXY values
        Point aDestPt(basegfx::fround(aTranslate.getX()), basegfx::fround(aTranslate.getY()));
        const Size aDestSize(
            basegfx::fround(aScale.getX() + aTranslate.getX()) - aDestPt.X(),
            basegfx::fround(aScale.getY() + aTranslate.getY()) - aDestPt.Y());
        const Point aOrigin = GetMapMode().GetOrigin();
        if (comphelper::LibreOfficeKit::isActive() && GetMapMode().GetMapUnit() != MapUnit::MapPixel)
        {
            aDestPt.Move(aOrigin.getX(), aOrigin.getY());
            EnableMapMode(false);
        }

        DrawBitmapEx(aDestPt, aDestSize, rBitmapEx);
        if (comphelper::LibreOfficeKit::isActive() && GetMapMode().GetMapUnit() != MapUnit::MapPixel)
        {
            EnableMapMode();
            aDestPt.Move(-aOrigin.getX(), -aOrigin.getY());
        }
        return;
    }

    // we have rotation,shear or mirror, check if some crazy mode needs the
    // created transformed bitmap
    const bool bInvert(RasterOp::Invert == meRasterOp);
    const bool bBitmapChangedColor(mnDrawMode & (DrawModeFlags::BlackBitmap | DrawModeFlags::WhiteBitmap | DrawModeFlags::GrayBitmap | DrawModeFlags::GhostedBitmap));
    const bool bMetafile(mpMetaFile);
    bool bDone(false);
    const basegfx::B2DHomMatrix aFullTransform(GetViewTransformation() * rTransformation);
    const bool bTryDirectPaint(!bInvert && !bBitmapChangedColor && !bMetafile );

    if(!bForceToOwnTransformer && bTryDirectPaint)
    {
        bDone = DrawTransformBitmapExDirect(aFullTransform, rBitmapEx);
    }

    if(!bDone)
    {
        // take the fallback when no rotate and shear, but mirror (else we would have done this above)
        if(!bForceToOwnTransformer && !bRotated && !bSheared)
        {
            // with no rotation or shear it can be mapped to DrawBitmapEx
            // do *not* execute the mirroring here, it's done in the fallback
            // #i124580# the correct DestSize needs to be calculated based on MaxXY values
            const Point aDestPt(basegfx::fround(aTranslate.getX()), basegfx::fround(aTranslate.getY()));
            const Size aDestSize(
                basegfx::fround(aScale.getX() + aTranslate.getX()) - aDestPt.X(),
                basegfx::fround(aScale.getY() + aTranslate.getY()) - aDestPt.Y());

            DrawBitmapEx(aDestPt, aDestSize, rBitmapEx);
            return;
        }

        // fallback; create transformed bitmap the hard way (back-transform
        // the pixels) and paint
        basegfx::B2DRange aVisibleRange(0.0, 0.0, 1.0, 1.0);

        // limit maximum area to something looking good for non-pixel-based targets (metafile, printer)
        // by using a fixed minimum (allow at least, but no need to utilize) for good smoothing and an area
        // dependent of original size for good quality when e.g. rotated/sheared. Still, limit to a maximum
        // to avoid crashes/resource problems (ca. 1500x3000 here)
        const Size& rOriginalSizePixel(rBitmapEx.GetSizePixel());
        const double fOrigArea(rOriginalSizePixel.Width() * rOriginalSizePixel.Height() * 0.5);
        const double fOrigAreaScaled(bSheared || bRotated ? fOrigArea * 1.44 : fOrigArea);
        double fMaximumArea(std::min(4500000.0, std::max(1000000.0, fOrigAreaScaled)));

        if(!bMetafile)
        {
            if ( !TransformAndReduceBitmapExToTargetRange( aFullTransform, aVisibleRange, fMaximumArea ) )
                return;
        }

        if(!aVisibleRange.isEmpty())
        {
            static bool bDoSmoothAtAll(true);
            BitmapEx aTransformed(rBitmapEx);

            // #122923# when the result needs an alpha channel due to being rotated or sheared
            // and thus uncovering areas, add these channels so that the own transformer (used
            // in getTransformed) also creates a transformed alpha channel
            if(!aTransformed.IsTransparent() && (bSheared || bRotated))
            {
                // parts will be uncovered, extend aTransformed with a mask bitmap
                const Bitmap aContent(aTransformed.GetBitmap());

                AlphaMask aMaskBmp(aContent.GetSizePixel());
                aMaskBmp.Erase(0);

                aTransformed = BitmapEx(aContent, aMaskBmp);
            }

            aTransformed = aTransformed.getTransformed(
                aFullTransform,
                aVisibleRange,
                fMaximumArea,
                bDoSmoothAtAll);
            basegfx::B2DRange aTargetRange(0.0, 0.0, 1.0, 1.0);

            // get logic object target range
            aTargetRange.transform(rTransformation);

            // get from unified/relative VisibleRange to logoc one
            aVisibleRange.transform(
                basegfx::tools::createScaleTranslateB2DHomMatrix(
                    aTargetRange.getRange(),
                    aTargetRange.getMinimum()));

            // extract point and size; do not remove size, the bitmap may have been prepared reduced by purpose
            // #i124580# the correct DestSize needs to be calculated based on MaxXY values
            const Point aDestPt(basegfx::fround(aVisibleRange.getMinX()), basegfx::fround(aVisibleRange.getMinY()));
            const Size aDestSize(
                basegfx::fround(aVisibleRange.getMaxX()) - aDestPt.X(),
                basegfx::fround(aVisibleRange.getMaxY()) - aDestPt.Y());

            DrawBitmapEx(aDestPt, aDestSize, aTransformed);
        }
    }
}

void OutputDevice::DrawImage( const Point& rPos, const Image& rImage, DrawImageFlags nStyle )
{
    assert(!is_double_buffered_window());

    DrawImage( rPos, Size(), rImage, nStyle );
}

void OutputDevice::DrawImage( const Point& rPos, const Size& rSize,
                              const Image& rImage, DrawImageFlags nStyle )
{
    assert(!is_double_buffered_window());

    bool bIsSizeValid = rSize.getWidth() != 0 && rSize.getHeight() != 0;

    if (!ImplIsRecordLayout())
    {
        Image& rNonConstImage = const_cast<Image&>(rImage);
        if (bIsSizeValid)
            rNonConstImage.Draw(this, rPos, nStyle, &rSize);
        else
            rNonConstImage.Draw(this, rPos, nStyle);
    }
}

namespace
{
    // Co = Cs + Cd*(1-As) premultiplied alpha -or-
    // Co = (AsCs + AdCd*(1-As)) / Ao
    inline sal_uInt8 CalcColor( const sal_uInt8 nSourceColor, const sal_uInt8 nSourceAlpha,
                                const sal_uInt8 nDstAlpha, const sal_uInt8 nResAlpha, const sal_uInt8 nDestColor )
    {
        int c = nResAlpha ? ( (int)nSourceAlpha*nSourceColor + (int)nDstAlpha*nDestColor -
                              (int)nDstAlpha*nDestColor*nSourceAlpha/255 ) / (int)nResAlpha : 0;
        return sal_uInt8( c );
    }

    inline BitmapColor AlphaBlend( int nX,               int nY,
                                   const long            nMapX,
                                   const long            nMapY,
                                   BitmapReadAccess*     pP,
                                   BitmapReadAccess*     pA,
                                   BitmapReadAccess*     pB,
                                   BitmapWriteAccess*    pAlphaW,
                                   sal_uInt8&            nResAlpha )
    {
        BitmapColor aDstCol,aSrcCol;
        aSrcCol = pP->GetColor( nMapY, nMapX );
        aDstCol = pB->GetColor( nY, nX );

        // vcl stores transparency, not alpha - invert it
        const sal_uInt8 nSrcAlpha = 255 - pA->GetPixelIndex( nMapY, nMapX );
        const sal_uInt8 nDstAlpha = 255 - pAlphaW->GetPixelIndex( nY, nX );

        // Perform porter-duff compositing 'over' operation

        // Co = Cs + Cd*(1-As)
        // Ad = As + Ad*(1-As)
        nResAlpha = (int)nSrcAlpha + (int)nDstAlpha - (int)nDstAlpha*nSrcAlpha/255;

        aDstCol.SetRed( CalcColor( aSrcCol.GetRed(), nSrcAlpha, nDstAlpha, nResAlpha, aDstCol.GetRed() ) );
        aDstCol.SetBlue( CalcColor( aSrcCol.GetBlue(), nSrcAlpha, nDstAlpha, nResAlpha, aDstCol.GetBlue() ) );
        aDstCol.SetGreen( CalcColor( aSrcCol.GetGreen(), nSrcAlpha, nDstAlpha, nResAlpha, aDstCol.GetGreen() ) );

        return aDstCol;
    }
}

bool OutputDevice::BlendBitmap(
            const SalTwoRect&   rPosAry,
            const Bitmap&       rBmp )
{
    return mpGraphics->BlendBitmap( rPosAry, *rBmp.ImplGetImpBitmap()->ImplGetSalBitmap(), this );
}

Bitmap OutputDevice::BlendBitmapWithAlpha(
            Bitmap&             aBmp,
            BitmapReadAccess*   pP,
            BitmapReadAccess*   pA,
            const Rectangle&    aDstRect,
            const sal_Int32     nOffY,
            const sal_Int32     nDstHeight,
            const sal_Int32     nOffX,
            const sal_Int32     nDstWidth,
            const long*         pMapX,
            const long*         pMapY )

{
    BitmapColor aDstCol;
    Bitmap      res;
    int         nX, nY;
    sal_uInt8   nResAlpha;

    SAL_WARN_IF( !mpAlphaVDev, "vcl.gdi", "BlendBitmapWithAlpha(): call me only with valid alpha VirtualDevice!" );

    bool bOldMapMode( mpAlphaVDev->IsMapModeEnabled() );
    mpAlphaVDev->EnableMapMode(false);

    Bitmap aAlphaBitmap( mpAlphaVDev->GetBitmap( aDstRect.TopLeft(), aDstRect.GetSize() ) );
    BitmapWriteAccess*  pAlphaW = aAlphaBitmap.AcquireWriteAccess();

    if( GetBitCount() <= 8 )
    {
        Bitmap              aDither( aBmp.GetSizePixel(), 8 );
        BitmapColor         aIndex( 0 );
        BitmapReadAccess*   pB = aBmp.AcquireReadAccess();
        BitmapWriteAccess*  pW = aDither.AcquireWriteAccess();

        if (pB && pP && pA && pW && pAlphaW)
        {
            int nOutY;

            for( nY = 0, nOutY = nOffY; nY < nDstHeight; nY++, nOutY++ )
            {
                const long nMapY = pMapY[ nY ];
                const long nModY = ( nOutY & 0x0FL ) << 4L;
                int nOutX;

                for( nX = 0, nOutX = nOffX; nX < nDstWidth; nX++, nOutX++ )
                {
                    const long  nMapX = pMapX[ nX ];
                    const sal_uLong nD = nVCLDitherLut[ nModY | ( nOutX & 0x0FL ) ];

                    aDstCol = AlphaBlend( nX, nY, nMapX, nMapY, pP, pA, pB, pAlphaW, nResAlpha );

                    aIndex.SetIndex( (sal_uInt8) ( nVCLRLut[ ( nVCLLut[ aDstCol.GetRed() ] + nD ) >> 16UL ] +
                                              nVCLGLut[ ( nVCLLut[ aDstCol.GetGreen() ] + nD ) >> 16UL ] +
                                              nVCLBLut[ ( nVCLLut[ aDstCol.GetBlue() ] + nD ) >> 16UL ] ) );
                    pW->SetPixel( nY, nX, aIndex );

                    aIndex.SetIndex( (sal_uInt8) ( nVCLRLut[ ( nVCLLut[ 255-nResAlpha ] + nD ) >> 16UL ] +
                                                   nVCLGLut[ ( nVCLLut[ 255-nResAlpha ] + nD ) >> 16UL ] +
                                                   nVCLBLut[ ( nVCLLut[ 255-nResAlpha ] + nD ) >> 16UL ] ) );
                    pAlphaW->SetPixel( nY, nX, aIndex );
                }
            }
        }

        Bitmap::ReleaseAccess( pB );
        Bitmap::ReleaseAccess( pW );
        res = aDither;
    }
    else
    {
        BitmapWriteAccess*  pB = aBmp.AcquireWriteAccess();
        if (pB && pP && pA && pAlphaW)
        {
            for( nY = 0; nY < nDstHeight; nY++ )
            {
                const long  nMapY = pMapY[ nY ];

                for( nX = 0; nX < nDstWidth; nX++ )
                {
                    const long nMapX = pMapX[ nX ];
                    aDstCol = AlphaBlend( nX, nY, nMapX, nMapY, pP, pA, pB, pAlphaW, nResAlpha );

                    pB->SetPixel( nY, nX, aDstCol );
                    pAlphaW->SetPixel( nY, nX, Color(255L-nResAlpha, 255L-nResAlpha, 255L-nResAlpha) );
                }
            }
        }

        Bitmap::ReleaseAccess( pB );
        res = aBmp;
    }

    Bitmap::ReleaseAccess( pAlphaW );
    mpAlphaVDev->DrawBitmap( aDstRect.TopLeft(), aAlphaBitmap );
    mpAlphaVDev->EnableMapMode( bOldMapMode );

    return res;
}

Bitmap OutputDevice::BlendBitmap(
            Bitmap&             aBmp,
            BitmapReadAccess*   pP,
            BitmapReadAccess*   pA,
            const sal_Int32     nOffY,
            const sal_Int32     nDstHeight,
            const sal_Int32     nOffX,
            const sal_Int32     nDstWidth,
            const Rectangle&    aBmpRect,
            const Size&         aOutSz,
            const bool          bHMirr,
            const bool          bVMirr,
            const long*         pMapX,
            const long*         pMapY )
{
    BitmapColor aDstCol;
    Bitmap      res;
    int         nX, nY;

    if( GetBitCount() <= 8 )
    {
        Bitmap              aDither( aBmp.GetSizePixel(), 8 );
        BitmapColor         aIndex( 0 );
        BitmapReadAccess*   pB = aBmp.AcquireReadAccess();
        BitmapWriteAccess*  pW = aDither.AcquireWriteAccess();

        if( pB && pP && pA && pW )
        {
            int nOutY;

            for( nY = 0, nOutY = nOffY; nY < nDstHeight; nY++, nOutY++ )
            {
                long nMapY = pMapY[ nY ];
                if (bVMirr)
                {
                    nMapY = aBmpRect.Bottom() - nMapY;
                }
                const long nModY = ( nOutY & 0x0FL ) << 4L;
                int nOutX;

                for( nX = 0, nOutX = nOffX; nX < nDstWidth; nX++, nOutX++ )
                {
                    long  nMapX = pMapX[ nX ];
                    if (bHMirr)
                    {
                        nMapX = aBmpRect.Right() - nMapX;
                    }
                    const sal_uLong nD = nVCLDitherLut[ nModY | ( nOutX & 0x0FL ) ];

                    aDstCol = pB->GetColor( nY, nX );
                    aDstCol.Merge( pP->GetColor( nMapY, nMapX ), pA->GetPixelIndex( nMapY, nMapX ) );
                    aIndex.SetIndex( (sal_uInt8) ( nVCLRLut[ ( nVCLLut[ aDstCol.GetRed() ] + nD ) >> 16UL ] +
                                              nVCLGLut[ ( nVCLLut[ aDstCol.GetGreen() ] + nD ) >> 16UL ] +
                                              nVCLBLut[ ( nVCLLut[ aDstCol.GetBlue() ] + nD ) >> 16UL ] ) );
                    pW->SetPixel( nY, nX, aIndex );
                }
            }
        }

        Bitmap::ReleaseAccess( pB );
        Bitmap::ReleaseAccess( pW );
        res = aDither;
    }
    else
    {
        BitmapWriteAccess*  pB = aBmp.AcquireWriteAccess();

        bool bFastBlend = false;
        if( pP && pA && pB )
        {
            if( !bHMirr && !bVMirr )
            {
                SalTwoRect aTR(aBmpRect.Left(), aBmpRect.Top(), aBmpRect.GetWidth(), aBmpRect.GetHeight(),
                               nOffX, nOffY, aOutSz.Width(), aOutSz.Height());

                bFastBlend = ImplFastBitmapBlending( *pB,*pP,*pA, aTR );
            }
        }

        if( pP && pA && pB && !bFastBlend )
        {
            switch( pP->GetScanlineFormat() )
            {
                case ScanlineFormat::N8BitPal:
                    {
                        for( nY = 0; nY < nDstHeight; nY++ )
                        {
                            long  nMapY = pMapY[ nY ];
                            if ( bVMirr )
                            {
                                nMapY = aBmpRect.Bottom() - nMapY;
                            }
                            Scanline    pPScan = pP->GetScanline( nMapY );
                            Scanline    pAScan = pA->GetScanline( nMapY );

                            for( nX = 0; nX < nDstWidth; nX++ )
                            {
                                long nMapX = pMapX[ nX ];

                                if ( bHMirr )
                                {
                                    nMapX = aBmpRect.Right() - nMapX;
                                }
                                aDstCol = pB->GetPixel( nY, nX );
                                pB->SetPixel( nY, nX, aDstCol.Merge( pP->GetPaletteColor( pPScan[ nMapX ] ),
                                                                     pAScan[ nMapX ] ) );
                            }
                        }
                    }
                    break;

                default:
                {

                    for( nY = 0; nY < nDstHeight; nY++ )
                    {
                        long  nMapY = pMapY[ nY ];

                        if ( bVMirr )
                        {
                            nMapY = aBmpRect.Bottom() - nMapY;
                        }
                        Scanline    pAScan = pA->GetScanline( nMapY );

                        for( nX = 0; nX < nDstWidth; nX++ )
                        {
                            long nMapX = pMapX[ nX ];

                            if ( bHMirr )
                            {
                                nMapX = aBmpRect.Right() - nMapX;
                            }
                            aDstCol = pB->GetPixel( nY, nX );
                            pB->SetPixel( nY, nX, aDstCol.Merge( pP->GetColor( nMapY, nMapX ),
                                                                 pAScan[ nMapX ] ) );
                        }
                    }
                }
                break;
            }
        }

        Bitmap::ReleaseAccess( pB );
        res = aBmp;
    }

    return res;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */