aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/hw/xfree86/xf4bpp/vgaBitBlt.c
blob: 2e89f43b78f20c2112d6d4ec9b84853cc6eeca12 (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
/* GJA -- span move routines */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include "xf4bpp.h"
#include "OScompiler.h"
#include "vgaReg.h"
#include "vgaVideo.h"

#include "xf86str.h" /* for pScrn->vtSema */
extern ScrnInfoPtr *xf86Screens;

#ifndef	PC98_EGC	/* not PC98_EGC */
/* NOTE: It seems that there is no way to program the VGA to copy just
 * a part of a byte in the smarter modes. Therefore we copy the boundaries
 * plane by plane.
 */
#define WORDSZ 8
 /* The fast blit code requires WORDSZ = 8 for its read-modify write cycle.
  * Therefore, we do not fully implement the other options.
  */
#define HIGHPLANEMASK 0x08
#define HIGHPLANEINDEX 3

/* Of course, we want the following anyway:
 * (Yes, they're identical now.)
 */
#define SMEM(x,y) ( VIDBASE(pWin) + (y) * BYTES_PER_LINE(pWin) + (x) )
#define DMEM(x,y) ( VIDBASE(pWin) + (y) * BYTES_PER_LINE(pWin) + (x) )

#define WORD8 unsigned char
#define LW8 BYTES_PER_LINE(pWin) /* Line width */
#define WSHIFT8 0x3
#define WMASK8 0x07
/* NOTE: lmask[8] matters. It must be different from lmask[0] */
static unsigned char lmasktab[] = {
	0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE, 0xFF
} ;
static unsigned char rmasktab[] = {
	0xFF, 0x7F, 0x3F, 0x1F, 0x0F, 0x07, 0x03, 0x01, 0x00
} ;

#define LMASK8(n) lmasktab[n]
#define RMASK8(n) rmasktab[n]
#define SWAPB8(x) (x)

#if (WORDSZ == 8)

#define WORD WORD8
#define LW LW8
#define WSHIFT WSHIFT8
#define WMASK WMASK8

#define LMASK(n) LMASK8(n)
#define RMASK(n) RMASK8(n)
#define SWAPB(x) SWAPB8(x)

#endif /* WORDSZ == 8 */

#define DO_ALU(dst,src,mask,alu) {\
	int _ndst, _odst; _odst = dst; \
	switch ( alu ) { \
	case GXclear: \
		_ndst = 0;			break; \
	case GXand: \
		_ndst = src & _odst;		break; \
	case GXandReverse: \
		_ndst = src & ~ _odst;		break; \
	case GXcopy: \
		_ndst = src;			break; \
	case GXandInverted: \
		_ndst = ~ src & _odst;		break; \
	default: \
	case GXnoop: \
		_ndst = _odst;			break; \
	case GXxor: \
		_ndst = src ^ _odst;		break; \
	case GXor: \
		_ndst = src | _odst;		break; \
	case GXnor: \
		_ndst = ~ src & ~ _odst;	break; \
	case GXequiv: \
		_ndst = ~ src ^ _odst;		break; \
	case GXinvert: \
		_ndst = ~ _odst;		break; \
	case GXorReverse: \
		_ndst = src | ~ _odst;		break; \
	case GXcopyInverted: \
		_ndst = ~ src;			break; \
	case GXorInverted: \
		_ndst = ~ src | _odst;		break; \
	case GXnand: \
		_ndst = ~ src | ~ _odst;	break; \
	case GXset: \
		_ndst = ~0;			break; \
	} \
	dst = (_odst & ~(mask)) | (_ndst & (mask)); \
	}

static void aligned_blit(
    WindowPtr, int, int, int, int, int, int, int, int
);

static void aligned_blit_center(
    WindowPtr, int, int, int, int, int, int
);

static void shift(
    WindowPtr, int, int, int, int, int, int, int
);

static void shift_thin_rect(
    WindowPtr, int, int, int, int, int, int, int
);

static void shift_center(
    WindowPtr, int, int, int, int, int, int, int
);

void xf4bppBitBlt(pWin,alu,writeplanes,x0,y0,x1,y1,w,h)
WindowPtr pWin; /* GJA */
int alu;
int writeplanes; /* planes */
int x0, y0, x1, y1, w, h;
{
    IOADDRESS REGBASE;
    int plane, bit;

    if ( !w || !h ) return;

    if ( ! xf86Screens[((DrawablePtr)pWin)->pScreen->myNum]->vtSema ) {
        xf4bppOffBitBlt(pWin,alu,writeplanes,x0,y0,x1,y1,w,h);
        return;
    }

    REGBASE =
	xf86Screens[((DrawablePtr)pWin)->pScreen->myNum]->domainIOBase + 0x300;

    /* 0x7, not WMASK: it is hardware dependant */
    if ( ((x0 - x1) & 0x7) || (alu != GXcopy) ) {
	/* Use slow copy */
	SetVideoGraphics(Enb_Set_ResetIndex, 0); /* All from CPU */
	SetVideoGraphics(Bit_MaskIndex, 0xFF); /* All bits */
	SetVideoGraphics(Graphics_ModeIndex, 0); /* Write mode 0 */
	SetVideoGraphics(Data_RotateIndex, 0); /* Don't rotate, replace */

	for ( plane = HIGHPLANEMASK, bit = HIGHPLANEINDEX ;
		plane ; plane >>= 1, bit-- )
	{

		if ( writeplanes & plane) {
			SetVideoGraphics(Read_Map_SelectIndex, bit);
			SetVideoSequencer(Mask_MapIndex, plane);

			shift(pWin,x0,x1,y0,y1,w,h,alu);
		}
	}
    } else {
        aligned_blit(pWin,x0,x1,y0,y1,w,h,alu,writeplanes);
    }
}

/* Copy a span a number of places to the right.
 */
static void
shift(pWin,x0,x1,y0,y1,w,h,alu)
WindowPtr pWin; /* GJA */
int x0;  /* left edge of source */
int x1;  /* left edge of target */
int y0;
int y1;
int w; /* length of source, and of target */
int h;
int alu;
{
  if ( ((x1 & WMASK) + w) <= WORDSZ ) {
     shift_thin_rect(pWin,x0,x1,y0,y1,w,h,alu);
  } else if ( x1 > x0 ) { /* Shift right: start right */
     int l1 = x1 & WMASK, r1 = (x1 + w) & WMASK;

     if ( r1 ) /* right edge */
        shift_thin_rect(pWin,x0+w-r1,x1+w-r1,y0,y1,r1,h,alu);
     shift_center(pWin,x0,x1,y0,y1,w,h,alu);
     if ( l1 ) /* left edge */
        shift_thin_rect(pWin,x0,x1,y0,y1,(WORDSZ-l1),h,alu);
  } else {
     int l1 = x1 & WMASK, r1 = (x1 + w) & WMASK;

     if ( l1 ) /* left edge */
        shift_thin_rect(pWin,x0,x1,y0,y1,(WORDSZ-l1),h,alu);
     shift_center(pWin,x0,x1,y0,y1,w,h,alu);
     if ( r1 ) /* right edge */
        shift_thin_rect(pWin,x0+w-r1,x1+w-r1,y0,y1,r1,h,alu);
  }
}

/* The whole rectangle is so thin that it fits in one byte written */
static void
shift_thin_rect(pWin,x0,x1,y0,y1,w,h,alu)
WindowPtr pWin; /* GJA */
int x0;  /* left edge of source */
int x1;  /* left edge of target */
int y0;
int y1;
int w; /* length of source, and of target */
int h;
int alu;
{
  int l0 = x0 & WMASK; /* Left edge of source, as bit */
  int l1 = x1 & WMASK; /* Left edge of target, as bit */
  int L0 = x0 >> WSHIFT; /* Left edge of source, as byte */
  int L1 = x1 >> WSHIFT; /* Left edge of target, as byte */
  int pad;
  int htmp;
  int mask;
  int tmp;
  int bs;
  
  volatile unsigned char *sp, *dp;

  mask = RMASK(l1) & LMASK(l1+w);
  bs = (x1 - x0) & WMASK;

  if ( y1 > y0 ) { /* Move down, start at the bottom */
    pad = - BYTES_PER_LINE(pWin);
    sp = SMEM(L0,y0+h-1);
    dp = DMEM(L1,y1+h-1);
  } else { /* Move up, start at the top */
    pad = BYTES_PER_LINE(pWin);
    sp = SMEM(L0,y0);
    dp = DMEM(L1,y1);
  }

  if ( l0+w > WORDSZ ) {
    /* Need two bytes */
    for ( htmp = h ; htmp ; htmp-- ) {
      tmp = (sp[0] << (WORDSZ - bs));
      sp++;
      tmp |= (sp[0] >> bs);
      sp--;
      DO_ALU(dp[0],tmp,mask,alu);
      dp += pad;
      sp += pad;
    }
  } else if ( l0 <= l1 ) {
    /* Need one byte, shifted right */
    for ( htmp = h ; htmp ; htmp-- ) {
      tmp = (sp[0] >> bs);
      DO_ALU(dp[0],tmp,mask,alu);
      dp += pad;
      sp += pad;
    }
  } else {
    /* Need one byte, shifted left */
    for ( htmp = h ; htmp ; htmp-- ) {
      tmp = (sp[0] << (WORDSZ - bs));
      DO_ALU(dp[0],tmp,mask,alu);
      dp += pad;
      sp += pad;
    }
  }
}

static void
shift_center(pWin,x0,x1,y0,y1,w,h,alu)
WindowPtr pWin; /* GJA */
int x0;  /* left edge of source */
int x1;  /* left edge of target */
int y0;
int y1;
int w; /* length of source, and of target */
int h;
int alu;
{
  int l1 = x1 & WMASK; /* Left edge of target, as bit */
  int r1 = (x1 + w) & WMASK; /* Right edge of target, as bit */
  int pad;
  int htmp, wtmp; /* Temporaries for indices over height and width */
  volatile unsigned char tmp; /* Temporary result of the shifts */
  int bs;
  int rem; /* Remaining bits; temporary in loop */
  int bytecnt;
  
  volatile unsigned char *sp, *dp;

  bs = (x1 - x0) & WMASK;

  if ( l1 ) {
     bytecnt = (w - (WORDSZ - l1) - r1) >> WSHIFT;
     sp = SMEM( ((x0 + (WORDSZ - l1)) >> WSHIFT), y0);
     dp = DMEM( ((x1 + (WORDSZ - l1)) >> WSHIFT), y1);
  } else {
     bytecnt = (w - r1) >> WSHIFT;
     sp = SMEM( (x0 >> WSHIFT), y0);
     dp = DMEM( (x1 >> WSHIFT), y1);
  }

  if ( y1 > y0 ) { /* Move down, start at the bottom */
    if ( x1 > x0 ) { /* Move right, start right */
       pad = - BYTES_PER_LINE(pWin) + bytecnt;
       sp += BYTES_PER_LINE(pWin) * (h - 1) + bytecnt - 1;
       dp += BYTES_PER_LINE(pWin) * (h - 1) + bytecnt - 1;
    } else { /* Move left, start left */
       pad = - BYTES_PER_LINE(pWin) - bytecnt;
       sp += BYTES_PER_LINE(pWin) * (h - 1);
       dp += BYTES_PER_LINE(pWin) * (h - 1);
    }
  } else { /* Move up, start at the top */
    if ( x1 > x0 ) { /* Move right, start right */
       pad = BYTES_PER_LINE(pWin) + bytecnt;
       sp += bytecnt - 1;
       dp += bytecnt - 1;
    } else { /* Move left, start left */
       pad = BYTES_PER_LINE(pWin) - bytecnt;
       sp += 0;
       dp += 0;
    }
  }

  if ( x1 > x0 ) { /* Move right, start right */
    if ( bs == 0 ) { /* No shift. Need one byte only */
      for ( htmp = h ; htmp ; htmp-- ) {
        for ( wtmp = bytecnt ; wtmp ; wtmp-- ) {
          tmp = sp[0];
          DO_ALU(dp[0],tmp,~0,alu); 
	  dp--;
          sp--;
        }
        dp += pad;
        sp += pad;
      } 
    } else {
      for ( htmp = h ; htmp ; htmp-- ) {
	if ( bytecnt ) {
	   sp++;
   	   rem = sp[0];
	   sp--;
           for ( wtmp = bytecnt ; wtmp ; wtmp-- ) {
             tmp = (rem >> bs);
             rem = sp[0];
             tmp |= (rem << (WORDSZ - bs)) ;
             DO_ALU(dp[0],tmp,~0,alu); 
	     dp--;
             sp--;
           }
        }
        dp += pad;
        sp += pad;
      } 
    }
  } else { /* x1 <= x0 */ /* Move left, start left */
    if ( bs == 0 ) { /* No shift. Need one byte only */
      for ( htmp = h ; htmp ; htmp-- ) {
        for ( wtmp = bytecnt ; wtmp ; wtmp-- ) {
          tmp = sp[0];
          DO_ALU(dp[0],tmp,~0,alu); 
	  dp++;
          sp++;
        }
        dp += pad;
        sp += pad;
      } 
    } else {
      for ( htmp = h ; htmp ; htmp-- ) {
        if ( bytecnt ) {
          rem = sp[0];
          for ( wtmp = bytecnt ; wtmp ; wtmp-- ) {
            tmp = (rem << (WORDSZ - bs));
	    sp++;
	    rem = sp[0];
	    sp--;
            tmp |= (rem >> bs);
            DO_ALU(dp[0],tmp,~0,alu); 
	    dp++;
            sp++;
          }
        }
        dp += pad;
        sp += pad;
      } 
    }
  }
}

/* Copy a rectangle.
 */
static void
aligned_blit(pWin,x0,x1,y0,y1,w,h,alu,planes)
WindowPtr pWin; /* GJA */
int x0;  /* left edge of source */
int x1;  /* left edge of target */
int y0;
int y1;
int w; /* length of source, and of target */
int h;
int alu;
int planes;
{
  IOADDRESS REGBASE =
	xf86Screens[((DrawablePtr)pWin)->pScreen->myNum]->domainIOBase + 0x300;
  int plane, bit;

  if ( ((x1 & WMASK) + w) <= WORDSZ ) {
	SetVideoGraphics(Enb_Set_ResetIndex, 0); /* All from CPU */
	SetVideoGraphics(Bit_MaskIndex, 0xFF); /* All bits */
	SetVideoGraphics(Graphics_ModeIndex, 0); /* Write mode 0 */
	SetVideoGraphics(Data_RotateIndex, 0); /* Don't rotate, replace */

	for ( plane = HIGHPLANEMASK, bit = HIGHPLANEINDEX;
		plane ; plane >>= 1, bit-- )
	{
		if ( planes & plane) {
			SetVideoGraphics(Read_Map_SelectIndex, bit);
			SetVideoSequencer(Mask_MapIndex, plane);

     			shift_thin_rect(pWin,x0,x1,y0,y1,w,h,alu);
		}
	}
  } else if ( x1 > x0 ) { /* Shift right: start right */
     int l1 = x1 & WMASK, r1 = (x1 + w) & WMASK;

     if ( r1 ) { /* right edge */
	SetVideoGraphics(Enb_Set_ResetIndex, 0); /* All from CPU */
	SetVideoGraphics(Bit_MaskIndex, 0xFF); /* All bits */
	SetVideoGraphics(Graphics_ModeIndex, 0); /* Write mode 0 */
	SetVideoGraphics(Data_RotateIndex, 0); /* Don't rotate, replace */

	for ( plane = HIGHPLANEMASK, bit = HIGHPLANEINDEX;
		plane ; plane >>= 1, bit-- )
	{
		if ( planes & plane) {
			SetVideoGraphics(Read_Map_SelectIndex, bit);
			SetVideoSequencer(Mask_MapIndex, plane);

		        shift_thin_rect(pWin,x0+w-r1,x1+w-r1,y0,y1,r1,h,alu);
		}
	}
     }

     /* Center */
     SetVideoGraphics(Graphics_ModeIndex, 1); /* Write mode 1 */
     SetVideoSequencer(Mask_MapIndex, planes);

     aligned_blit_center(pWin,x0,x1,y0,y1,w,h);

     if ( l1 ) { /* left edge */
	SetVideoGraphics(Enb_Set_ResetIndex, 0); /* All from CPU */
	SetVideoGraphics(Bit_MaskIndex, 0xFF); /* All bits */
	SetVideoGraphics(Graphics_ModeIndex, 0); /* Write mode 0 */
	SetVideoGraphics(Data_RotateIndex, 0); /* Don't rotate, replace */

	for ( plane = HIGHPLANEMASK, bit = HIGHPLANEINDEX;
		plane ; plane >>= 1, bit-- )
	{
		if ( planes & plane) {
			SetVideoGraphics(Read_Map_SelectIndex, bit);
			SetVideoSequencer(Mask_MapIndex, plane);

        		shift_thin_rect(pWin,x0,x1,y0,y1,(WORDSZ-l1),h,alu);
		}
	}
     }
  } else {
     int l1 = x1 & WMASK, r1 = (x1 + w) & WMASK;

     if ( l1 ) { /* left edge */
	SetVideoGraphics(Enb_Set_ResetIndex, 0); /* All from CPU */
	SetVideoGraphics(Bit_MaskIndex, 0xFF); /* All bits */
	SetVideoGraphics(Graphics_ModeIndex, 0); /* Write mode 0 */
	SetVideoGraphics(Data_RotateIndex, 0); /* Don't rotate, replace */

	for ( plane = HIGHPLANEMASK, bit = HIGHPLANEINDEX;
		plane ; plane >>= 1, bit-- )
	{
		if ( planes & plane) {
			SetVideoGraphics(Read_Map_SelectIndex, bit);
			SetVideoSequencer(Mask_MapIndex, plane);

        		shift_thin_rect(pWin,x0,x1,y0,y1,(WORDSZ-l1),h,alu);
		}
	}
     }

     /* Center */
     SetVideoGraphics(Graphics_ModeIndex, 1); /* Write mode 1 */
     SetVideoSequencer(Mask_MapIndex, planes);

     aligned_blit_center(pWin,x0,x1,y0,y1,w,h);

     if ( r1 ) { /* right edge */
	SetVideoGraphics(Enb_Set_ResetIndex, 0); /* All from CPU */
	SetVideoGraphics(Bit_MaskIndex, 0xFF); /* All bits */
	SetVideoGraphics(Graphics_ModeIndex, 0); /* Write mode 0 */
	SetVideoGraphics(Data_RotateIndex, 0); /* Don't rotate, replace */

	for ( plane = HIGHPLANEMASK, bit = HIGHPLANEINDEX ;
		plane ; plane >>= 1, bit-- )
	{
		if ( planes & plane) {
			SetVideoGraphics(Read_Map_SelectIndex, bit);
			SetVideoSequencer(Mask_MapIndex, plane);

        		shift_thin_rect(pWin,x0+w-r1,x1+w-r1,y0,y1,r1,h,alu);
		}
	}
     }
  }
}

static void
aligned_blit_center(pWin,x0,x1,y0,y1,w,h)
WindowPtr pWin; /* GJA */
int x0;  /* left edge of source */
int x1;  /* left edge of target */
int y0;
int y1;
int w; /* length of source, and of target */
int h;
{
  int l1 = x1 & WMASK; /* Left edge of target, as bit */
  int r1 = (x1 + w) & WMASK; /* Right edge of target, as bit */
  int pad;
  int htmp, wtmp; /* Temporaries for indices over height and width */
  volatile unsigned char tmp; /* Temporary result of the shifts */
  int bytecnt;
  
  volatile unsigned char *sp, *dp;

  if ( l1 ) {
     bytecnt = (w - (WORDSZ - l1) - r1) >> WSHIFT;
     sp = SMEM( ((x0 + (WORDSZ - l1)) >> WSHIFT), y0);
     dp = DMEM( ((x1 + (WORDSZ - l1)) >> WSHIFT), y1);
  } else {
     bytecnt = (w - r1) >> WSHIFT;
     sp = SMEM( (x0 >> WSHIFT), y0);
     dp = DMEM( (x1 >> WSHIFT), y1);
  }

  if ( y1 > y0 ) { /* Move down, start at the bottom */
    if ( x1 > x0 ) { /* Move right, start right */
       pad = - BYTES_PER_LINE(pWin) + bytecnt;
       sp += BYTES_PER_LINE(pWin) * (h - 1) + bytecnt - 1;
       dp += BYTES_PER_LINE(pWin) * (h - 1) + bytecnt - 1;
    } else { /* Move left, start left */
       pad = - BYTES_PER_LINE(pWin) - bytecnt;
       sp += BYTES_PER_LINE(pWin) * (h - 1);
       dp += BYTES_PER_LINE(pWin) * (h - 1);
    }
  } else { /* Move up, start at the top */
    if ( x1 > x0 ) { /* Move right, start right */
       pad = BYTES_PER_LINE(pWin) + bytecnt;
       sp += bytecnt - 1;
       dp += bytecnt - 1;
    } else { /* Move left, start left */
       pad = BYTES_PER_LINE(pWin) - bytecnt;
       sp += 0;
       dp += 0;
    }
  }

  if ( x1 > x0 ) { /* Move right, start right */
      for ( htmp = h ; htmp ; htmp-- ) {
        for ( wtmp = bytecnt ; wtmp ; wtmp-- ) {
          tmp = sp[0];
	  dp[0] = tmp;
	  dp--;
          sp--;
        }
        dp += pad;
        sp += pad;
      } 
  } else { /* x1 <= x0 */ /* Move left, start left */
      for ( htmp = h ; htmp ; htmp-- ) {
        for ( wtmp = bytecnt ; wtmp ; wtmp-- ) {
          tmp = sp[0];
          dp[0] = tmp;
	  dp++;
          sp++;
        }
        dp += pad;
        sp += pad;
      } 
  }
}
#else	/* PC98_EGC */

static void
egc_fast_blt (pWin, alu, writeplanes, x0, y0, x1, y1, w, h)
WindowPtr pWin;	
const	int alu, writeplanes ;
register int x0, x1 ;
int	     y0, y1 ;
register int w, h ;
{
register volatile unsigned char *src ;
register volatile unsigned char *dst ;
unsigned short *src_x ;
unsigned short *dst_x ;
int x_direction, y_interval ;
int	src_off, dst_off ;
register int k, i ;
unsigned short ROP_value;

src = (unsigned char *)SCREENADDRESS( pWin, 0, y0);
dst = (unsigned char *)SCREENADDRESS( pWin, 0, y1);

/* Set Map Mask */
outw(EGC_PLANE, ~(writeplanes & VGA_ALLPLANES));
switch(alu) {
case GXnor:		/* ~(S|D) */
    ROP_value = 0x2903;
    break;
case GXandInverted:	/* ~S&D */
    ROP_value = 0x290c;
    break;
case GXand:		/* S&D */
    ROP_value = 0x29c0;
    break;
case GXequiv:		/* ~S ^ D */
    ROP_value = 0x29c3;
    break;
case GXxor:		/* S^D */
    ROP_value = 0x293c;
    break;
case GXandReverse:	/* S&~D */
    ROP_value = 0x2930;
    break;
case GXorReverse:	/* S|~D */
    ROP_value = 0x29f3;
    break;
case GXnand:		/* ~(S&D) */
    ROP_value = 0x293f;
    break;
case GXorInverted:	/* ~S|D */
    ROP_value = 0x29cf;
    break;
case GXor:		/* S|D */
    ROP_value = 0x29fa;
    break;
case GXcopyInverted:	/* ~S */
    ROP_value = 0x290f;
    break;
case GXcopy:		/* S */
default:
    ROP_value = 0x29f0;
}
outw(EGC_MODE, ROP_value);
if ( y1 > y0 ) {
	y_interval = - BYTES_PER_LINE(pWin) * 8 ;
	src += BYTES_PER_LINE(pWin) * ( h - 1 ) ;
	dst += BYTES_PER_LINE(pWin) * ( h - 1 ) ;
}
else {
	y_interval = BYTES_PER_LINE(pWin) * 8 ;
}

src = (unsigned char *)((int)src << 3) ;
dst = (unsigned char *)((int)dst << 3) ;

if ( y1 > y0) {
	x_direction = 0x1000 ;
	src += x0 + w - 1 ;
	dst += x1 + w - 1 ;
} else if ( y1 < y0 ) {
	x_direction = 0 ;
	src += x0 ;
	dst += x1 ;
} else {
	if ( x1 < x0 ) {
		x_direction = 0 ;
		src += x0 ;
		dst += x1 ;
	} else {
		x_direction = 0x1000 ;
		src += x0 + w - 1 ;
		dst += x1 + w - 1 ;
	}
}
	outw ( EGC_LENGTH , w - 1 ) ;

for ( ; h-- ; ) {
	if ( x_direction ) {
		src_off = 15 - (int)src & 0xf ;
		dst_off = 15 - (int)dst & 0xf ;
	} else {
		src_off = (int)src & 0xf ;
		dst_off = (int)dst & 0xf ;
	}
#if defined(__NetBSD__) || defined(__OpenBSD__)
	src_x   = (unsigned short *)(((unsigned int)src >> 4 ) << 1) ;
	dst_x   = (unsigned short *)(((unsigned int)dst >> 4 ) << 1) ;
#else
	src_x   = (unsigned short *)(((int)src >> 4 ) << 1) ;
	dst_x   = (unsigned short *)(((int)dst >> 4 ) << 1) ;
#endif
	k = ( src_off + w + 15 ) >> 4 ;
	if ( src_off < dst_off ) {
		if ( ((src_off + w - 1 ) >> 4) < ((dst_off + w - 1) >> 4)) k++ ;
	}
	if ( src_off > dst_off ) {
		if ( ((src_off + w - 1) >> 4 ) == ((dst_off + w - 1) >> 4) ) k++ ;
		if ( x_direction ) dst_x ++ ;
			else	   dst_x -- ;
	}
	outw ( EGC_ADD , x_direction | src_off | dst_off << 4 );
	if ( x_direction ) {
		wcopyl ( src_x, dst_x, k, VIDBASE(pWin) ) ;
	} else {
		wcopyr ( src_x, dst_x, k, VIDBASE(pWin) ) ;
	}
src += y_interval ;
dst += y_interval ;
}
outw ( EGC_ADD, 0 ) ;
outw ( EGC_LENGTH , 0xf );
return;
}

void
xf4bppBitBlt( pWin,alu, writeplanes, x0, y0, x1, y1, w, h )
WindowPtr pWin; /* GJA */
int alu;
int writeplanes; /* planes */
int x0, y0, x1, y1, w, h;
{
	if ( ! xf86Screens[((DrawablePtr)pWin)->pScreen->myNum]->vtSema ) {
		xf4bppOffBitBlt( pWin, alu, writeplanes,
			   x0, y0, x1, y1, w, h );
		return;
	}

switch ( alu ) {
	case GXclear:		/* 0x0 Zero 0 */
	case GXinvert:		/* 0xa NOT dst */
	case GXset:		/* 0xf 1 */
		xf4bppFillSolid( pWin, VGA_ALLPLANES, alu, writeplanes, x1, y1, w, h ) ;
			/* x1, y1, GJA */
	case GXnoop:		/* 0x5 dst */
		return ;
	default:
		break ;
}

egc_fast_blt ( pWin, alu, writeplanes, x0, y0, x1, y1, w, h);
return;
}
#endif