summaryrefslogtreecommitdiffstats
path: root/vcl/unx/generic/dtrans/bmp.cxx
blob: ac8e50cc2e297221cfd8ac8ced11387d28b0d213 (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
/* -*- 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 <tools/stream.hxx>

#include <vcl/dibtools.hxx>
#include <vcl/svapp.hxx>
#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/BitmapSimpleColorQuantizationFilter.hxx>

#include <sal/log.hxx>
#include <unx/x11/xlimits.hxx>

#include "bmp.hxx"

using namespace x11;

/*
 *  helper functions
 */

static void writeLE( sal_uInt16 nNumber, sal_uInt8* pBuffer )
{
    pBuffer[ 0 ] = (nNumber & 0xff);
    pBuffer[ 1 ] = ((nNumber>>8)&0xff);
}

static void writeLE( sal_uInt32 nNumber, sal_uInt8* pBuffer )
{
    pBuffer[ 0 ] = (nNumber & 0xff);
    pBuffer[ 1 ] = ((nNumber>>8)&0xff);
    pBuffer[ 2 ] = ((nNumber>>16)&0xff);
    pBuffer[ 3 ] = ((nNumber>>24)&0xff);
}

static sal_uInt16 readLE16( const sal_uInt8* pBuffer )
{
    //This is untainted data which comes from a controlled source
    //so, using a byte-swapping pattern which coverity doesn't
    //detect as such
    //http://security.coverity.com/blog/2014/Apr/on-detecting-heartbleed-with-static-analysis.html
    sal_uInt16 v = pBuffer[1]; v <<= 8;
    v |= pBuffer[0];
    return v;
}

static sal_uInt32 readLE32( const sal_uInt8* pBuffer )
{
    //This is untainted data which comes from a controlled source
    //so, using a byte-swapping pattern which coverity doesn't
    //detect as such
    //http://security.coverity.com/blog/2014/Apr/on-detecting-heartbleed-with-static-analysis.html
    sal_uInt32 v = pBuffer[3]; v <<= 8;
    v |= pBuffer[2]; v <<= 8;
    v |= pBuffer[1]; v <<= 8;
    v |= pBuffer[0];
    return v;
}

/*
 * scanline helpers
 */

static void X11_writeScanlinePixel( unsigned long nColor, sal_uInt8* pScanline, int depth, int x )
{
    switch( depth )
    {
        case 1:
            pScanline[ x/8 ] &= ~(1 << (x&7));
            pScanline[ x/8 ] |= ((nColor & 1) << (x&7));
            break;
        case 4:
            pScanline[ x/2 ] &= ((x&1) ? 0x0f : 0xf0);
            pScanline[ x/2 ] |= ((x&1) ? (nColor & 0x0f) : ((nColor & 0x0f) << 4));
            break;
        default:
        case 8:
            pScanline[ x ] = (nColor & 0xff);
            break;
    }
}

static sal_uInt8* X11_getPaletteBmpFromImage(
                                             Display* pDisplay,
                                             XImage* pImage,
                                             Colormap aColormap,
                                             sal_Int32& rOutSize
                                             )
{
    sal_uInt32 nColors = 0;

    rOutSize = 0;

    sal_uInt8* pBuffer = nullptr;
    sal_uInt32 nHeaderSize, nScanlineSize;
    sal_uInt16 nBitCount;
    // determine header and scanline size
    switch( pImage->depth )
    {
        case 1:
            nHeaderSize = 64;
            nScanlineSize = (pImage->width+31)/32;
            nBitCount = 1;
            break;
        case 4:
            nHeaderSize = 72;
            nScanlineSize = (pImage->width+1)/2;
            nBitCount = 4;
            break;
        default:
        case 8:
            nHeaderSize = 1084;
            nScanlineSize = pImage->width;
            nBitCount = 8;
            break;
    }
    // adjust scan lines to begin on %4 boundaries
    if( nScanlineSize & 3 )
    {
        nScanlineSize &= 0xfffffffc;
        nScanlineSize += 4;
    }

    // allocate buffer to hold header and scanlines, initialize to zero
    rOutSize = nHeaderSize + nScanlineSize*pImage->height;
    pBuffer = static_cast<sal_uInt8*>(rtl_allocateZeroMemory( rOutSize ));
    for( int y = 0; y < pImage->height; y++ )
    {
        sal_uInt8* pScanline = pBuffer + nHeaderSize + (pImage->height-1-y)*nScanlineSize;
        for( int x = 0; x < pImage->width; x++ )
        {
            unsigned long nPixel = XGetPixel( pImage, x, y );
            if( nPixel >= nColors )
                nColors = nPixel+1;
            X11_writeScanlinePixel( nPixel, pScanline, pImage->depth, x );
        }
    }

    // fill in header fields
    pBuffer[ 0 ] = 'B';
    pBuffer[ 1 ] = 'M';

    writeLE( nHeaderSize, pBuffer+10 );
    writeLE( sal_uInt32(40), pBuffer+14 );
    writeLE( static_cast<sal_uInt32>(pImage->width), pBuffer+18 );
    writeLE( static_cast<sal_uInt32>(pImage->height), pBuffer+22 );
    writeLE( sal_uInt16(1), pBuffer+26 );
    writeLE( nBitCount, pBuffer+28 );
    writeLE( static_cast<sal_uInt32>(DisplayWidth(pDisplay,DefaultScreen(pDisplay))*1000/DisplayWidthMM(pDisplay,DefaultScreen(pDisplay))), pBuffer+38);
    writeLE( static_cast<sal_uInt32>(DisplayHeight(pDisplay,DefaultScreen(pDisplay))*1000/DisplayHeightMM(pDisplay,DefaultScreen(pDisplay))), pBuffer+42);
    writeLE( nColors, pBuffer+46 );
    writeLE( nColors, pBuffer+50 );

    XColor aColors[256];
    if( nColors > (1U << nBitCount) ) // paranoia
        nColors = (1U << nBitCount);
    for( unsigned long nPixel = 0; nPixel < nColors; nPixel++ )
    {
        aColors[nPixel].flags = DoRed | DoGreen | DoBlue;
        aColors[nPixel].pixel = nPixel;
    }
    XQueryColors( pDisplay, aColormap, aColors, nColors );
    for( sal_uInt32 i = 0; i < nColors; i++ )
    {
        pBuffer[ 54 + i*4 ] = static_cast<sal_uInt8>(aColors[i].blue >> 8);
        pBuffer[ 55 + i*4 ] = static_cast<sal_uInt8>(aColors[i].green >> 8);
        pBuffer[ 56 + i*4 ] = static_cast<sal_uInt8>(aColors[i].red >> 8);
    }

    // done

    return pBuffer;
}

static unsigned long doRightShift( unsigned long nValue, int nShift )
{
    return (nShift > 0) ? (nValue >> nShift) : (nValue << (-nShift));
}

static unsigned long doLeftShift( unsigned long nValue, int nShift )
{
    return (nShift > 0) ? (nValue << nShift) : (nValue >> (-nShift));
}

static void getShift( unsigned long nMask, int& rShift, int& rSigBits, int& rShift2 )
{
    unsigned long nUseMask = nMask;
    rShift = 0;
    while( nMask & 0xffffff00 )
    {
        rShift++;
        nMask >>= 1;
    }
    if( rShift == 0 )
        while( ! (nMask & 0x00000080) )
        {
            rShift--;
            nMask <<= 1;
        }

    int nRotate = sizeof(unsigned long)*8 - rShift;
    rSigBits = 0;
    nMask = doRightShift( nUseMask, rShift) ;
    while( nRotate-- )
    {
        if( nMask & 1 )
            rSigBits++;
        nMask >>= 1;
    }

    rShift2 = 0;
    if( rSigBits < 8 )
        rShift2 = 8-rSigBits;
}

static sal_uInt8* X11_getTCBmpFromImage(
                                             Display* pDisplay,
                                             XImage* pImage,
                                             sal_Int32& rOutSize,
                                             int nScreenNo
                                             )
{
    // get masks from visual info (guesswork)
    XVisualInfo aVInfo;
    if( ! XMatchVisualInfo( pDisplay, nScreenNo, pImage->depth, TrueColor, &aVInfo ) )
        return nullptr;

    rOutSize = 0;

    sal_uInt8* pBuffer = nullptr;
    sal_uInt32 nHeaderSize = 60;
    sal_uInt32 nScanlineSize = pImage->width*3;

    // adjust scan lines to begin on %4 boundaries
    if( nScanlineSize & 3 )
    {
        nScanlineSize &= 0xfffffffc;
        nScanlineSize += 4;
    }
    int nRedShift, nRedSig, nRedShift2 = 0;
    getShift( aVInfo.red_mask, nRedShift, nRedSig, nRedShift2 );
    int nGreenShift, nGreenSig, nGreenShift2 = 0;
    getShift( aVInfo.green_mask, nGreenShift, nGreenSig, nGreenShift2 );
    int nBlueShift, nBlueSig, nBlueShift2 = 0;
    getShift( aVInfo.blue_mask, nBlueShift, nBlueSig, nBlueShift2 );

    // allocate buffer to hold header and scanlines, initialize to zero
    rOutSize = nHeaderSize + nScanlineSize*pImage->height;
    pBuffer = static_cast<sal_uInt8*>(rtl_allocateZeroMemory( rOutSize ));
    for( int y = 0; y < pImage->height; y++ )
    {
        sal_uInt8* pScanline = pBuffer + nHeaderSize + (pImage->height-1-y)*nScanlineSize;
        for( int x = 0; x < pImage->width; x++ )
        {
            unsigned long nPixel = XGetPixel( pImage, x, y );

            sal_uInt8 nValue = static_cast<sal_uInt8>(doRightShift( nPixel&aVInfo.blue_mask, nBlueShift));
            if( nBlueShift2 )
                nValue |= (nValue >> nBlueShift2 );
            *pScanline++ = nValue;

            nValue = static_cast<sal_uInt8>(doRightShift( nPixel&aVInfo.green_mask, nGreenShift));
            if( nGreenShift2 )
                nValue |= (nValue >> nGreenShift2 );
            *pScanline++ = nValue;

            nValue = static_cast<sal_uInt8>(doRightShift( nPixel&aVInfo.red_mask, nRedShift));
            if( nRedShift2 )
                nValue |= (nValue >> nRedShift2 );
            *pScanline++ = nValue;
        }
    }

    // fill in header fields
    pBuffer[  0 ] = 'B';
    pBuffer[  1 ] = 'M';

    writeLE( nHeaderSize, pBuffer+10 );
    writeLE( sal_uInt32(40), pBuffer+14 );
    writeLE( static_cast<sal_uInt32>(pImage->width), pBuffer+18 );
    writeLE( static_cast<sal_uInt32>(pImage->height), pBuffer+22 );
    writeLE( sal_uInt16(1), pBuffer+26 );
    writeLE( sal_uInt16(24), pBuffer+28 );
    writeLE( static_cast<sal_uInt32>(DisplayWidth(pDisplay,DefaultScreen(pDisplay))*1000/DisplayWidthMM(pDisplay,DefaultScreen(pDisplay))), pBuffer+38);
    writeLE( static_cast<sal_uInt32>(DisplayHeight(pDisplay,DefaultScreen(pDisplay))*1000/DisplayHeightMM(pDisplay,DefaultScreen(pDisplay))), pBuffer+42);

    // done

    return pBuffer;
}

sal_uInt8* x11::X11_getBmpFromPixmap(
                                Display* pDisplay,
                                Drawable aDrawable,
                                Colormap aColormap,
                                sal_Int32& rOutSize
                                )
{
    // get geometry of drawable
    ::Window aRoot;
    int x,y;
    unsigned int w, h, bw, d;
    XGetGeometry( pDisplay, aDrawable, &aRoot, &x, &y, &w, &h, &bw, &d );

    // find which screen we are on
    int nScreenNo = ScreenCount( pDisplay );
    while( nScreenNo-- )
    {
        if( RootWindow( pDisplay, nScreenNo ) == aRoot )
            break;
    }
    if( nScreenNo < 0 )
        return nullptr;

    if( aColormap == None )
        aColormap = DefaultColormap( pDisplay, nScreenNo );

    // get the image
    XImage* pImage = XGetImage( pDisplay, aDrawable, 0, 0, w, h, AllPlanes, ZPixmap );
    if( ! pImage )
        return nullptr;

    sal_uInt8* pBmp = d <= 8 ?
        X11_getPaletteBmpFromImage( pDisplay, pImage, aColormap, rOutSize ) :
        X11_getTCBmpFromImage( pDisplay, pImage, rOutSize, nScreenNo );
    XDestroyImage( pImage );

    return pBmp;
}

/*
 *  PixmapHolder
 */

PixmapHolder::PixmapHolder( Display* pDisplay )
    : m_pDisplay(pDisplay)
    , m_aColormap(None)
    , m_aPixmap(None)
    , m_aBitmap(None)
    , m_nRedShift(0)
    , m_nGreenShift(0)
    , m_nBlueShift(0)
    , m_nBlueShift2Mask(0)
    , m_nRedShift2Mask(0)
    , m_nGreenShift2Mask(0)
{
    /*  try to get a 24 bit true color visual, if that fails,
     *  revert to default visual
     */
    if( ! XMatchVisualInfo( m_pDisplay, DefaultScreen( m_pDisplay ), 24, TrueColor, &m_aInfo ) )
    {
#if OSL_DEBUG_LEVEL > 1
        SAL_INFO("vcl.unx.dtrans", "PixmapHolder reverting to default visual.");
#endif
        Visual* pVisual     = DefaultVisual( m_pDisplay, DefaultScreen( m_pDisplay ) );
        m_aInfo.screen      = DefaultScreen( m_pDisplay );
        m_aInfo.visual      = pVisual;
        m_aInfo.visualid    = pVisual->visualid;
        m_aInfo.c_class     = pVisual->c_class;
        m_aInfo.red_mask    = pVisual->red_mask;
        m_aInfo.green_mask  = pVisual->green_mask;
        m_aInfo.blue_mask   = pVisual->blue_mask;
        m_aInfo.depth       = DefaultDepth( m_pDisplay, m_aInfo.screen );
    }
    m_aColormap         = DefaultColormap( m_pDisplay, m_aInfo.screen );
#if OSL_DEBUG_LEVEL > 1
    static const char* pClasses[] =
        { "StaticGray", "GrayScale", "StaticColor", "PseudoColor", "TrueColor", "DirectColor" };
    SAL_INFO("vcl.unx.dtrans", "PixmapHolder visual: id = "
        << std::showbase << std::hex
        << m_aInfo.visualid
        << ", class = "
        << ((m_aInfo.c_class >= 0 &&
                unsigned(m_aInfo.c_class) <
                SAL_N_ELEMENTS(pClasses)) ?
            pClasses[m_aInfo.c_class] :
            "<unknown>")
        << " ("
        << std::dec
        << m_aInfo.c_class
        << "), depth="
        << m_aInfo.depth
        << "; color map = "
        << std::showbase << std::hex
        << m_aColormap);
#endif
    if( m_aInfo.c_class != TrueColor )
        return;

    int nRedShift2(0);
    int nGreenShift2(0);
    int nBlueShift2(0);
    int nRedSig, nGreenSig, nBlueSig;
    getShift( m_aInfo.red_mask, m_nRedShift, nRedSig, nRedShift2 );
    getShift( m_aInfo.green_mask, m_nGreenShift, nGreenSig, nGreenShift2 );
    getShift( m_aInfo.blue_mask, m_nBlueShift, nBlueSig, nBlueShift2 );

    m_nBlueShift2Mask = nBlueShift2 ? ~static_cast<unsigned long>((1<<nBlueShift2)-1) : ~0L;
    m_nGreenShift2Mask = nGreenShift2 ? ~static_cast<unsigned long>((1<<nGreenShift2)-1) : ~0L;
    m_nRedShift2Mask = nRedShift2 ? ~static_cast<unsigned long>((1<<nRedShift2)-1) : ~0L;
}

PixmapHolder::~PixmapHolder()
{
    if( m_aPixmap != None )
        XFreePixmap( m_pDisplay, m_aPixmap );
    if( m_aBitmap != None )
        XFreePixmap( m_pDisplay, m_aBitmap );
}

unsigned long PixmapHolder::getTCPixel( sal_uInt8 r, sal_uInt8 g, sal_uInt8 b ) const
{
    unsigned long nPixel = 0;
    unsigned long nValue = static_cast<unsigned long>(b);
    nValue &= m_nBlueShift2Mask;
    nPixel |= doLeftShift( nValue, m_nBlueShift );

    nValue = static_cast<unsigned long>(g);
    nValue &= m_nGreenShift2Mask;
    nPixel |= doLeftShift( nValue, m_nGreenShift );

    nValue = static_cast<unsigned long>(r);
    nValue &= m_nRedShift2Mask;
    nPixel |= doLeftShift( nValue, m_nRedShift );

    return nPixel;
}

void PixmapHolder::setBitmapDataPalette( const sal_uInt8* pData, XImage* pImage )
{
    // setup palette
    XColor aPalette[256];

    sal_uInt32 nColors = readLE32( pData+32 );
    sal_uInt32 nWidth   = readLE32( pData+4 );
    sal_uInt32 nHeight  = readLE32( pData+8 );
    sal_uInt16 nDepth = readLE16( pData+14 );

    for( sal_uInt32 i = 0 ; i < nColors; i++ )
    {
        if( m_aInfo.c_class != TrueColor )
        {
            //This is untainted data which comes from a controlled source
            //so, using a byte-swapping pattern which coverity doesn't
            //detect as such
            //http://security.coverity.com/blog/2014/Apr/on-detecting-heartbleed-with-static-analysis.html
            aPalette[i].red = static_cast<unsigned short>(pData[42 + i*4]);
            aPalette[i].red <<= 8;
            aPalette[i].red |= static_cast<unsigned short>(pData[42 + i*4]);

            aPalette[i].green = static_cast<unsigned short>(pData[41 + i*4]);
            aPalette[i].green <<= 8;
            aPalette[i].green |= static_cast<unsigned short>(pData[41 + i*4]);

            aPalette[i].blue = static_cast<unsigned short>(pData[40 + i*4]);
            aPalette[i].blue <<= 8;
            aPalette[i].blue |= static_cast<unsigned short>(pData[40 + i*4]);
            XAllocColor( m_pDisplay, m_aColormap, aPalette+i );
        }
        else
            aPalette[i].pixel = getTCPixel( pData[42+i*4], pData[41+i*4], pData[40+i*4] );
    }
    const sal_uInt8* pBMData = pData + readLE32( pData ) + 4*nColors;

    sal_uInt32 nScanlineSize = 0;
    switch( nDepth )
    {
        case 1:
            nScanlineSize = (nWidth+31)/32;
            break;
        case 4:
            nScanlineSize = (nWidth+1)/2;
            break;
        case 8:
            nScanlineSize = nWidth;
            break;
    }
    // adjust scan lines to begin on %4 boundaries
    if( nScanlineSize & 3 )
    {
        nScanlineSize &= 0xfffffffc;
        nScanlineSize += 4;
    }

    // allocate buffer to hold header and scanlines, initialize to zero
    for( unsigned int y = 0; y < nHeight; y++ )
    {
        const sal_uInt8* pScanline = pBMData + (nHeight-1-y)*nScanlineSize;
        for( unsigned int x = 0; x < nWidth; x++ )
        {
            int nCol = 0;
            switch( nDepth )
            {
                case 1: nCol = (pScanline[ x/8 ] & (0x80 >> (x&7))) != 0 ? 0 : 1; break;
                case 4:
                    if( x & 1 )
                        nCol = static_cast<int>(pScanline[ x/2 ] >> 4);
                    else
                        nCol = static_cast<int>(pScanline[ x/2 ] & 0x0f);
                    break;
                case 8: nCol = static_cast<int>(pScanline[x]);
            }
            XPutPixel( pImage, x, y, aPalette[nCol].pixel );
        }
    }
}

void PixmapHolder::setBitmapDataTCDither( const sal_uInt8* pData, XImage* pImage )
{
    XColor aPalette[216];

    int nNonAllocs = 0;

    for( int r = 0; r < 6; r++ )
    {
        for( int g = 0; g < 6; g++ )
        {
            for( int b = 0; b < 6; b++ )
            {
                int i = r*36+g*6+b;
                aPalette[i].red     = r == 5 ? 0xffff : r*10922;
                aPalette[i].green   = g == 5 ? 0xffff : g*10922;
                aPalette[i].blue    = b == 5 ? 0xffff : b*10922;
                aPalette[i].pixel   = 0;
                if( ! XAllocColor( m_pDisplay, m_aColormap, aPalette+i ) )
                    nNonAllocs++;
            }
        }
    }

    if( nNonAllocs )
    {
        XColor aRealPalette[256];
        int nColors = 1 << m_aInfo.depth;
        int i;
        for( i = 0; i < nColors; i++ )
            aRealPalette[i].pixel = static_cast<unsigned long>(i);
        XQueryColors( m_pDisplay, m_aColormap, aRealPalette, nColors );
        for( i = 0; i < nColors; i++ )
        {
            sal_uInt8 nIndex =
                36*static_cast<sal_uInt8>(aRealPalette[i].red/10923) +
                6*static_cast<sal_uInt8>(aRealPalette[i].green/10923) +
                static_cast<sal_uInt8>(aRealPalette[i].blue/10923);
            if( aPalette[nIndex].pixel == 0 )
                aPalette[nIndex] = aRealPalette[i];
        }
    }

    sal_uInt32 nWidth   = readLE32( pData+4 );
    sal_uInt32 nHeight  = readLE32( pData+8 );

    const sal_uInt8* pBMData = pData + readLE32( pData );
    sal_uInt32 nScanlineSize = nWidth*3;
    // adjust scan lines to begin on %4 boundaries
    if( nScanlineSize & 3 )
    {
        nScanlineSize &= 0xfffffffc;
        nScanlineSize += 4;
    }

    for( int y = 0; y < static_cast<int>(nHeight); y++ )
    {
        const sal_uInt8* pScanline = pBMData + (nHeight-1-static_cast<sal_uInt32>(y))*nScanlineSize;
        for( int x = 0; x < static_cast<int>(nWidth); x++ )
        {
            sal_uInt8 b = pScanline[3*x];
            sal_uInt8 g = pScanline[3*x+1];
            sal_uInt8 r = pScanline[3*x+2];
            sal_uInt8 i = 36*(r/43) + 6*(g/43) + (b/43);

            XPutPixel( pImage, x, y, aPalette[ i ].pixel );
        }
    }
}

void PixmapHolder::setBitmapDataTC( const sal_uInt8* pData, XImage* pImage )
{
    sal_uInt32 nWidth   = readLE32( pData+4 );
    sal_uInt32 nHeight  = readLE32( pData+8 );

    if (!nWidth || !nHeight)
        return;

    const sal_uInt8* pBMData = pData + readLE32( pData );
    sal_uInt32 nScanlineSize = nWidth*3;
    // adjust scan lines to begin on %4 boundaries
    if( nScanlineSize & 3 )
    {
        nScanlineSize &= 0xfffffffc;
        nScanlineSize += 4;
    }

    for( int y = 0; y < static_cast<int>(nHeight); y++ )
    {
        const sal_uInt8* pScanline = pBMData + (nHeight-1-static_cast<sal_uInt32>(y))*nScanlineSize;
        for( int x = 0; x < static_cast<int>(nWidth); x++ )
        {
            unsigned long nPixel = getTCPixel( pScanline[3*x+2], pScanline[3*x+1], pScanline[3*x] );
            XPutPixel( pImage, x, y, nPixel );
        }
    }
}

bool PixmapHolder::needsConversion( const sal_uInt8* pData ) const
{
    if( pData[0] != 'B' || pData[1] != 'M' )
        return true;

    pData = pData+14;
    sal_uInt32 nDepth = readLE32( pData+14 );
    if(  nDepth == 24 )
    {
        if( m_aInfo.c_class != TrueColor )
            return true;
    }
    else if( nDepth != static_cast<sal_uInt32>(m_aInfo.depth) )
    {
        if( m_aInfo.c_class != TrueColor )
            return true;
    }

    return false;
}

Pixmap PixmapHolder::setBitmapData( const sal_uInt8* pData )
{
    if( pData[0] != 'B' || pData[1] != 'M' )
        return None;

    pData = pData+14;

    // reject compressed data
    if( readLE32( pData + 16 ) != 0 )
        return None;

    sal_uInt32 nWidth   = readLE32( pData+4 );
    sal_uInt32 nHeight  = readLE32( pData+8 );

    if( m_aPixmap != None )
    {
        XFreePixmap( m_pDisplay, m_aPixmap );
        m_aPixmap = None;
    }
    if( m_aBitmap != None )
    {
        XFreePixmap( m_pDisplay, m_aBitmap );
        m_aBitmap = None;
    }

    m_aPixmap = limitXCreatePixmap( m_pDisplay,
                               RootWindow( m_pDisplay, m_aInfo.screen ),
                               nWidth, nHeight, m_aInfo.depth );

    if( m_aPixmap != None )
    {
        XImage aImage;
        aImage.width            = static_cast<int>(nWidth);
        aImage.height           = static_cast<int>(nHeight);
        aImage.xoffset          = 0;
        aImage.format           = ZPixmap;
        aImage.data             = nullptr;
        aImage.byte_order       = ImageByteOrder( m_pDisplay );
        aImage.bitmap_unit      = BitmapUnit( m_pDisplay );
        aImage.bitmap_bit_order = BitmapBitOrder( m_pDisplay );
        aImage.bitmap_pad       = BitmapPad( m_pDisplay );
        aImage.depth            = m_aInfo.depth;
        aImage.red_mask         = m_aInfo.red_mask;
        aImage.green_mask       = m_aInfo.green_mask;
        aImage.blue_mask        = m_aInfo.blue_mask;
        aImage.bytes_per_line   = 0; // filled in by XInitImage
        if( m_aInfo.depth <= 8 )
            aImage.bits_per_pixel = m_aInfo.depth;
        else
            aImage.bits_per_pixel = 8*((m_aInfo.depth+7)/8);
        aImage.obdata           = nullptr;

        XInitImage( &aImage );
        aImage.data = static_cast<char*>(std::malloc( nHeight*aImage.bytes_per_line ));

        if( readLE32( pData+14 ) == 24 )
        {
            if( m_aInfo.c_class == TrueColor )
                setBitmapDataTC( pData, &aImage );
            else
                setBitmapDataTCDither( pData, &aImage );
        }
        else
            setBitmapDataPalette( pData, &aImage );

        // put the image
        XPutImage( m_pDisplay,
                   m_aPixmap,
                   DefaultGC( m_pDisplay, m_aInfo.screen ),
                   &aImage,
                   0, 0,
                   0, 0,
                   nWidth, nHeight );

        // clean up
        std::free( aImage.data );

        // prepare bitmap (mask)
        m_aBitmap = limitXCreatePixmap( m_pDisplay,
                                   RootWindow( m_pDisplay, m_aInfo.screen ),
                                   nWidth, nHeight, 1 );
        XGCValues aVal;
        aVal.function = GXcopy;
        aVal.foreground = 0xffffffff;
        GC aGC = XCreateGC( m_pDisplay, m_aBitmap, GCFunction | GCForeground, &aVal );
        XFillRectangle( m_pDisplay, m_aBitmap, aGC, 0, 0, nWidth, nHeight );
        XFreeGC( m_pDisplay, aGC );
    }

    return m_aPixmap;
}

css::uno::Sequence<sal_Int8> x11::convertBitmapDepth(
    css::uno::Sequence<sal_Int8> const & data, int depth)
{
    if (depth < 4) {
        depth = 1;
    } else if (depth < 8) {
        depth = 4;
    } else if (depth > 8 && depth < 24) {
        depth = 24;
    }
    SolarMutexGuard g;
    SvMemoryStream in(
        const_cast<sal_Int8 *>(data.getConstArray()), data.getLength(),
        StreamMode::READ);
    Bitmap bm;
    ReadDIB(bm, in, true);
    if (bm.getPixelFormat() == vcl::PixelFormat::N24_BPP && depth <= 8) {
        bm.Dither();
    }
    if (vcl::pixelFormatBitCount(bm.getPixelFormat()) != depth) {
        switch (depth) {
        case 1:
            bm.Convert(BmpConversion::N1BitThreshold);
            break;
        case 4:
        {
            BitmapEx aBmpEx(bm);
            BitmapFilter::Filter(aBmpEx, BitmapSimpleColorQuantizationFilter(1<<4));
            bm = aBmpEx.GetBitmap();
        }
        break;

        case 8:
        {
            BitmapEx aBmpEx(bm);
            BitmapFilter::Filter(aBmpEx, BitmapSimpleColorQuantizationFilter(1<<8));
            bm = aBmpEx.GetBitmap();
        }
        break;

        case 24:
            bm.Convert(BmpConversion::N24Bit);
            break;
        }
    }
    SvMemoryStream out;
    WriteDIB(bm, out, false, true);
    return css::uno::Sequence<sal_Int8>(
        static_cast<sal_Int8 const *>(out.GetData()), out.GetEndOfData());
}

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