summaryrefslogtreecommitdiff
path: root/frontends/amiga/plotters.c
blob: f06f911637c2ce71ff24e60b479291f87946c978 (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
/*
 * Copyright 2008-09, 2012-13 Chris Young <chris@unsatisfactorysoftware.co.uk>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "amiga/os3support.h"

#include <proto/exec.h>
#include <proto/intuition.h>
#include <proto/layers.h>
#include <proto/graphics.h>

#include <intuition/intuition.h>
#include <graphics/rpattr.h>
#include <graphics/gfxmacros.h>
#include <graphics/gfxbase.h>

#ifdef __amigaos4__
#include <graphics/blitattr.h>
#include <graphics/composite.h>
#endif

#include <math.h>
#include <assert.h>
#include <stdlib.h>

#include "utils/nsoption.h"
#include "utils/utils.h"
#include "utils/log.h"
#include "netsurf/css.h"
#include "netsurf/mouse.h"
#include "netsurf/window.h"

#include "amiga/plotters.h"
#include "amiga/bitmap.h"
#include "amiga/font.h"
#include "amiga/gui.h"
#include "amiga/memory.h"
#include "amiga/misc.h"
#include "amiga/rtg.h"
#include "amiga/utf8.h"

HOOKF(void, ami_bitmap_tile_hook, struct RastPort *, rp, struct BackFillMessage *);

struct bfbitmap {
	struct BitMap *bm;
	ULONG width;
	ULONG height;
	int offsetx;
	int offsety;
	APTR mask;
	bool palette_mapped;
};

struct ami_plot_pen {
	struct MinNode node;
	ULONG pen;
};

struct bez_point {
	float x;
	float y;
};

struct gui_globals {
	struct BitMap *bm;
	struct RastPort *rp;
	struct Layer_Info *layerinfo;
	APTR areabuf;
	APTR tmprasbuf;
	struct Rectangle rect;
	struct MinList *shared_pens;
	bool managed_pen_list;
	bool palette_mapped;
	ULONG apen;
	ULONG open;
	LONG apen_num;
	LONG open_num;
	int width;  /* size of bm and    */
	int height; /* associated memory */
};

static int init_layers_count = 0;
static APTR pool_pens = NULL;
static bool palette_mapped = true; /* palette-mapped state for the screen */

#ifndef M_PI /* For some reason we don't always get this from math.h */
#define M_PI		3.14159265358979323846
#endif

#define PATT_DOT  0xAAAA
#define PATT_DASH 0xCCCC
#define PATT_LINE 0xFFFF

/* This defines the size of the list for Area* functions.
   25000 = 5000 vectors
  */
#define AREA_SIZE 25000

struct gui_globals *ami_plot_ra_alloc(ULONG width, ULONG height, bool force32bit, bool alloc_pen_list)
{
	/* init shared bitmaps */
 	int depth = 32;
	struct BitMap *friend = NULL;
	struct Screen *scrn = ami_gui_get_screen();

	struct gui_globals *gg = malloc(sizeof(struct gui_globals));

	if(force32bit == false) depth = GetBitMapAttr(scrn->RastPort.BitMap, BMA_DEPTH);
	NSLOG(netsurf, INFO, "Screen depth = %d", depth);

#ifdef __amigaos4__
	if(depth < 16) {
		gg->palette_mapped = true;
		if(force32bit == false) palette_mapped = true;
	} else {
		gg->palette_mapped = false;
		if(force32bit == false) palette_mapped = false;
	}
#else
	/* Friend BitMaps are weird.
	 * For OS4, we shouldn't use a friend BitMap here (see below).
	 * For OS3 AGA, we get no display blitted if we use a friend BitMap,
	 * however on RTG it seems to be a benefit.
	 */
	if(nsoption_bool(friend_bitmap) == true) {
		friend = scrn->RastPort.BitMap;
	} else {
		/* Force friend BitMaps on for obvious RTG screens under OS3.
		 * If we get a bit smarter about this we can lose the user option. */
		if((depth > 8) && (force32bit == false)) friend = scrn->RastPort.BitMap;
	}

	/* OS3 is locked to using palette-mapped display even on RTG.
	 * To change this, comment out the below and build with the similar OS4 lines above.
	 * Various bits of RTG code are OS4-only and OS3 versions will need to be written,
	 * however a brief test reveals a negative performance benefit, so this lock to a
	 * palette-mapped display is most likely permanent.
	 */
#warning OS3 locked to palette-mapped modes
	gg->palette_mapped = true;
	palette_mapped = true;
	if(depth > 8) depth = 8;
#endif

	/* Probably need to fix this next line */
	if(gg->palette_mapped == true) nsoption_set_bool(font_antialiasing, false);

	if(!width) width = nsoption_int(redraw_tile_size_x);
	if(!height) height = nsoption_int(redraw_tile_size_y);
	gg->width = width;
	gg->height = height;

	gg->layerinfo = NewLayerInfo();
	gg->areabuf = malloc(AREA_SIZE);

	/* OS3/AGA requires this to be in chip mem.  RTG would probably rather it wasn't. */
	gg->tmprasbuf = ami_memory_chip_alloc(width * height);

	if(gg->palette_mapped == true) {
		gg->bm = AllocBitMap(width, height, depth, 0, friend);
	} else {
#ifdef __amigaos4__
		/* Screen depth is reported as 24 even when it's actually 32-bit.
		 * We get freezes and other problems on OS4 if we befriend at any
		 * other depths, hence this check.
		 * \todo use friend BitMaps but avoid CompositeTags() at non-32-bit
		 * as that seems to be the cause of the problems.
		 */
		if((depth >= 24) && (force32bit == false)) friend = scrn->RastPort.BitMap;
#endif
		gg->bm = ami_rtg_allocbitmap(width, height, 32, 0, friend, RGBFB_A8R8G8B8);
	}

	if(!gg->bm) amiga_warn_user("NoMemory","");

	gg->rp = malloc(sizeof(struct RastPort));
	if(!gg->rp) amiga_warn_user("NoMemory","");

	InitRastPort(gg->rp);
	gg->rp->BitMap = gg->bm;

	SetDrMd(gg->rp,BGBACKFILL);

	gg->rp->Layer = CreateUpfrontLayer(gg->layerinfo,gg->rp->BitMap,0,0,
					width-1, height-1, LAYERSIMPLE, NULL);

	InstallLayerHook(gg->rp->Layer,LAYERS_NOBACKFILL);

	gg->rp->AreaInfo = malloc(sizeof(struct AreaInfo));
	if((!gg->areabuf) || (!gg->rp->AreaInfo))	amiga_warn_user("NoMemory","");

	InitArea(gg->rp->AreaInfo, gg->areabuf, AREA_SIZE/5);

	gg->rp->TmpRas = malloc(sizeof(struct TmpRas));
	if((!gg->tmprasbuf) || (!gg->rp->TmpRas))	amiga_warn_user("NoMemory","");

	InitTmpRas(gg->rp->TmpRas, gg->tmprasbuf, width*height);

	gg->shared_pens = NULL;
	gg->managed_pen_list = false;

	if(gg->palette_mapped == true) {
		if(pool_pens == NULL) {
			pool_pens = ami_memory_itempool_create(sizeof(struct ami_plot_pen));
		}

		if(alloc_pen_list == true) {
			gg->shared_pens = ami_AllocMinList();
			gg->managed_pen_list = true;
		}
	}

	gg->apen = 0x00000000;
	gg->open = 0x00000000;
	gg->apen_num = -1;
	gg->open_num = -1;

	init_layers_count++;
	NSLOG(netsurf, INFO, "Layer initialised (total: %d)",
	      init_layers_count);

	return gg;
}

void ami_plot_ra_free(struct gui_globals *gg)
{
	init_layers_count--;

	if(init_layers_count < 0) return;

	if((init_layers_count == 0) && (pool_pens != NULL)) {
		ami_memory_itempool_delete(pool_pens);
		pool_pens = NULL;
	}

	if(gg->rp) {
		if(gg->rp->Layer != NULL) DeleteLayer(0, gg->rp->Layer);
		free(gg->rp->TmpRas);
		free(gg->rp->AreaInfo);
		free(gg->rp);
	}

	ami_memory_chip_free(gg->tmprasbuf);
	free(gg->areabuf);
	DisposeLayerInfo(gg->layerinfo);
	if(gg->palette_mapped == false) {
		if(gg->bm) ami_rtg_freebitmap(gg->bm);
	} else {
		if(gg->bm) FreeBitMap(gg->bm);
	}

	if(gg->managed_pen_list == true) {
		ami_plot_release_pens(gg->shared_pens);
		free(gg->shared_pens);
		gg->shared_pens = NULL;
	}

	free(gg);
}

struct RastPort *ami_plot_ra_get_rastport(struct gui_globals *gg)
{
	return gg->rp;
}

struct BitMap *ami_plot_ra_get_bitmap(struct gui_globals *gg)
{
	return gg->bm;
}

void ami_plot_ra_get_size(struct gui_globals *gg, int *width, int *height)
{
	*width = gg->width;
	*height = gg->height;
}

void ami_plot_ra_set_pen_list(struct gui_globals *gg, struct MinList *pen_list)
{
	gg->shared_pens = pen_list;
}

void ami_clearclipreg(struct gui_globals *gg)
{
	struct Region *reg = NULL;
	struct Screen *scrn = ami_gui_get_screen();

	reg = InstallClipRegion(gg->rp->Layer,NULL);
	if(reg) DisposeRegion(reg);

	gg->rect.MinX = 0;
	gg->rect.MinY = 0;
	gg->rect.MaxX = scrn->Width-1;
	gg->rect.MaxY = scrn->Height-1;

	gg->apen = 0x00000000;
	gg->open = 0x00000000;
	gg->apen_num = -1;
	gg->open_num = -1;
}

static ULONG ami_plot_obtain_pen(struct MinList *shared_pens, ULONG colr)
{
	struct ami_plot_pen *node;
	struct Screen *scrn = ami_gui_get_screen();

	LONG pen = ObtainBestPenA(scrn->ViewPort.ColorMap,
			(colr & 0x000000ff) << 24,
			(colr & 0x0000ff00) << 16,
			(colr & 0x00ff0000) << 8,
			NULL);
	
	if(pen == -1) NSLOG(netsurf, INFO,
			    "WARNING: Cannot allocate pen for ABGR:%lx", colr);

	if((shared_pens != NULL) && (pool_pens != NULL)) {
		if((node = (struct ami_plot_pen *)ami_memory_itempool_alloc(pool_pens, sizeof(struct ami_plot_pen)))) {
			node->pen = pen;
			AddTail((struct List *)shared_pens, (struct Node *)node);
		}
	} else {
		/* Immediately release the pen if we can't keep track of it. */
		ReleasePen(scrn->ViewPort.ColorMap, pen);
	}
	return pen;
}

void ami_plot_release_pens(struct MinList *shared_pens)
{
	struct Screen *scrn = ami_gui_get_screen();
	struct ami_plot_pen *node;
	struct ami_plot_pen *nnode;

	if(shared_pens == NULL) return;
	if(IsMinListEmpty(shared_pens)) return;
	node = (struct ami_plot_pen *)GetHead((struct List *)shared_pens);

	do {
		nnode = (struct ami_plot_pen *)GetSucc((struct Node *)node);
		ReleasePen(scrn->ViewPort.ColorMap, node->pen);
		Remove((struct Node *)node);
		ami_memory_itempool_free(pool_pens, node, sizeof(struct ami_plot_pen));
	} while((node = nnode));

}

static void ami_plot_setapen(struct gui_globals *glob, struct RastPort *rp, ULONG colr)
{
	if(glob->apen == colr) return;

#ifdef __amigaos4__
	if(glob->palette_mapped == false) {
		SetRPAttrs(rp, RPTAG_APenColor,
			ns_color_to_nscss(colr),
			TAG_DONE);
	} else
#endif
	{
		LONG pen = ami_plot_obtain_pen(glob->shared_pens, colr);
		if((pen != -1) && (pen != glob->apen_num)) SetAPen(rp, pen);
	}

	glob->apen = colr;
}

static void ami_plot_setopen(struct gui_globals *glob, struct RastPort *rp, ULONG colr)
{
	if(glob->open == colr) return;

#ifdef __amigaos4__
	if(glob->palette_mapped == false) {
		SetRPAttrs(rp, RPTAG_OPenColor,
			ns_color_to_nscss(colr),
			TAG_DONE);
	} else
#endif
	{
		LONG pen = ami_plot_obtain_pen(glob->shared_pens, colr);
		if((pen != -1) && (pen != glob->open_num)) SetOPen(rp, pen);
	}

	glob->open = colr;
}

void ami_plot_clear_bbox(struct RastPort *rp, struct IBox *bbox)
{
	if((bbox == NULL) || (rp == NULL)) return;

	EraseRect(rp, bbox->Left, bbox->Top,
		bbox->Width + bbox->Left, bbox->Height + bbox->Top);
}


static void ami_arc_gfxlib(struct RastPort *rp, int x, int y, int radius, int angle1, int angle2)
{
	float angle1_r = (float)(angle1) * (M_PI / 180.0);
	float angle2_r = (float)(angle2) * (M_PI / 180.0);
	float angle, b, c;
	float step = 0.1; //(angle2_r - angle1_r) / ((angle2_r - angle1_r) * (float)radius);
	int x0, y0, x1, y1;

	x0 = x;
	y0 = y;
	
	b = angle1_r;
	c = angle2_r;
	
	x1 = (int)(cos(b) * (float)radius);
	y1 = (int)(sin(b) * (float)radius);
	Move(rp, x0 + x1, y0 - y1);
		
	for(angle = (b + step); angle <= c; angle += step) {
		x1 = (int)(cos(angle) * (float)radius);
		y1 = (int)(sin(angle) * (float)radius);
		Draw(rp, x0 + x1, y0 - y1);
	}
}

/**
 */
static nserror
ami_bitmap(struct gui_globals *glob, int x, int y, int width, int height, struct bitmap *bitmap)
{
	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_bitmap()");
	struct Screen *scrn = ami_gui_get_screen();
	struct BitMap *tbm;

	if (!width || !height) {
		return NSERROR_OK;
	}

	if (((x + width) < glob->rect.MinX) ||
	    ((y + height) < glob->rect.MinY) ||
	    (x > glob->rect.MaxX) ||
	    (y > glob->rect.MaxY)) {
		return NSERROR_OK;
	}

	tbm = ami_bitmap_get_native(bitmap, width, height, glob->palette_mapped, glob->rp->BitMap);
	if (!tbm) {
		return NSERROR_OK;
	}

	NSLOG(plot, DEEPDEBUG, "[ami_plotter] ami_bitmap() got native bitmap");

#ifdef __amigaos4__
	if (__builtin_expect((GfxBase->LibNode.lib_Version >= 53) &&
			     (glob->palette_mapped == false), 1)) {
		uint32 comptype = COMPOSITE_Src_Over_Dest;
		uint32 compflags = COMPFLAG_IgnoreDestAlpha;
		if(amiga_bitmap_get_opaque(bitmap)) {
			compflags |= COMPFLAG_SrcAlphaOverride;
			comptype = COMPOSITE_Src;
		}

		CompositeTags(comptype,tbm,glob->rp->BitMap,
					COMPTAG_Flags, compflags,
					COMPTAG_DestX,glob->rect.MinX,
					COMPTAG_DestY,glob->rect.MinY,
					COMPTAG_DestWidth,glob->rect.MaxX - glob->rect.MinX + 1,
					COMPTAG_DestHeight,glob->rect.MaxY - glob->rect.MinY + 1,
					COMPTAG_SrcWidth,width,
					COMPTAG_SrcHeight,height,
					COMPTAG_OffsetX,x,
					COMPTAG_OffsetY,y,
					COMPTAG_FriendBitMap, scrn->RastPort.BitMap,
					TAG_DONE);
	} else
#endif
	{
		ULONG tag, tag_data, minterm = 0xc0;
		
		if (glob->palette_mapped == false) {
			tag = BLITA_UseSrcAlpha;
			tag_data = !amiga_bitmap_get_opaque(bitmap);
			minterm = 0xc0;
		} else {
			tag = BLITA_MaskPlane;
			if ((tag_data = (ULONG)ami_bitmap_get_mask(bitmap, width, height, tbm)))
				minterm = MINTERM_SRCMASK;
		}
#ifdef __amigaos4__
		BltBitMapTags(BLITA_Width,width,
						BLITA_Height,height,
						BLITA_Source,tbm,
						BLITA_Dest,glob->rp,
						BLITA_DestX,x,
						BLITA_DestY,y,
						BLITA_SrcType,BLITT_BITMAP,
						BLITA_DestType,BLITT_RASTPORT,
						BLITA_Minterm, minterm,
						tag, tag_data,
						TAG_DONE);
#else
		if (tag_data) {
			BltMaskBitMapRastPort(tbm, 0, 0, glob->rp, x, y, width, height, minterm, tag_data);
		} else {
			BltBitMapRastPort(tbm, 0, 0, glob->rp, x, y, width, height, 0xc0);
		}
#endif
	}

	if ((ami_bitmap_is_nativebm(bitmap, tbm) == false)) {
		ami_rtg_freebitmap(tbm);
	}

	return NSERROR_OK;
}


HOOKF(void, ami_bitmap_tile_hook, struct RastPort *, rp, struct BackFillMessage *)
{
	int xf,yf;
	struct bfbitmap *bfbm = (struct bfbitmap *)hook->h_Data;
	struct Screen *scrn = ami_gui_get_screen();

	/* tile down and across to extents  (msg->Bounds.MinX)*/
	for (xf = -bfbm->offsetx; xf < msg->Bounds.MaxX; xf += bfbm->width) {
		for (yf = -bfbm->offsety; yf < msg->Bounds.MaxY; yf += bfbm->height) {
#ifdef __amigaos4__
			if(__builtin_expect((GfxBase->LibNode.lib_Version >= 53) &&
				(bfbm->palette_mapped == false), 1)) {
				CompositeTags(COMPOSITE_Src_Over_Dest, bfbm->bm, rp->BitMap,
					COMPTAG_Flags, COMPFLAG_IgnoreDestAlpha,
					COMPTAG_DestX, msg->Bounds.MinX,
					COMPTAG_DestY, msg->Bounds.MinY,
					COMPTAG_DestWidth, msg->Bounds.MaxX - msg->Bounds.MinX + 1,
					COMPTAG_DestHeight, msg->Bounds.MaxY - msg->Bounds.MinY + 1,
					COMPTAG_SrcWidth, bfbm->width,
					COMPTAG_SrcHeight, bfbm->height,
					COMPTAG_OffsetX, xf,
					COMPTAG_OffsetY, yf,
					COMPTAG_FriendBitMap, scrn->RastPort.BitMap,
					TAG_DONE);
			} else
#endif
			{
				ULONG tag, tag_data, minterm = 0xc0;
		
				if(bfbm->palette_mapped == false) {
					tag = BLITA_UseSrcAlpha;
					tag_data = TRUE;
					minterm = 0xc0;
				} else {
					tag = BLITA_MaskPlane;
					if((tag_data = (ULONG)bfbm->mask))
						minterm = MINTERM_SRCMASK;
				}
#ifdef __amigaos4__
				BltBitMapTags(BLITA_Width, bfbm->width,
					BLITA_Height, bfbm->height,
					BLITA_Source, bfbm->bm,
					BLITA_Dest, rp,
					BLITA_DestX, xf,
					BLITA_DestY, yf,
					BLITA_SrcType, BLITT_BITMAP,
					BLITA_DestType, BLITT_RASTPORT,
					BLITA_Minterm, minterm,
					tag, tag_data,
					TAG_DONE);
#else
				if(tag_data) {
					BltMaskBitMapRastPort(bfbm->bm, 0, 0, rp, xf, yf,
						bfbm->width, bfbm->height, minterm, tag_data);
				} else {
					BltBitMapRastPort(bfbm->bm, 0, 0, rp, xf, yf,
						bfbm->width, bfbm->height, minterm);
				}
#endif
			}			
		}
	}
}

static void ami_bezier(struct bez_point *restrict a, struct bez_point *restrict b,
				struct bez_point *restrict c, struct bez_point *restrict d,
				float t, struct bez_point *restrict p) {
    p->x = pow((1 - t), 3) * a->x + 3 * t * pow((1 -t), 2) * b->x + 3 * (1-t) * pow(t, 2)* c->x + pow (t, 3)* d->x;
    p->y = pow((1 - t), 3) * a->y + 3 * t * pow((1 -t), 2) * b->y + 3 * (1-t) * pow(t, 2)* c->y + pow (t, 3)* d->y;
}


bool ami_plot_screen_is_palettemapped(void)
{
	/* This may not be entirely correct - previously we returned the state of the current BitMap */
	return palette_mapped;
}


/**
 * \brief Sets a clip rectangle for subsequent plot operations.
 *
 * \param ctx The current redraw context.
 * \param clip The rectangle to limit all subsequent plot
 *              operations within.
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_clip(const struct redraw_context *ctx, const struct rect *clip)
{
	struct gui_globals *glob = (struct gui_globals *)ctx->priv;
	struct Region *reg = NULL;

	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_clip()");

	if (glob->rp->Layer) {
		reg = NewRegion();

		glob->rect.MinX = clip->x0;
		glob->rect.MinY = clip->y0;
		glob->rect.MaxX = clip->x1-1;
		glob->rect.MaxY = clip->y1-1;

		OrRectRegion(reg,&glob->rect);

		reg = InstallClipRegion(glob->rp->Layer,reg);

		if(reg) {
			DisposeRegion(reg);
		}
	}

	return NSERROR_OK;
}


/**
 * Plots an arc
 *
 * plot an arc segment around (x,y), anticlockwise from angle1
 *  to angle2. Angles are measured anticlockwise from
 *  horizontal, in degrees.
 *
 * \param ctx The current redraw context.
 * \param style Style controlling the arc plot.
 * \param x The x coordinate of the arc.
 * \param y The y coordinate of the arc.
 * \param radius The radius of the arc.
 * \param angle1 The start angle of the arc.
 * \param angle2 The finish angle of the arc.
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_arc(const struct redraw_context *ctx,
	const plot_style_t *style,
	int x, int y, int radius, int angle1, int angle2)
{
	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_arc()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	if (angle2 < angle1) {
		angle2 += 360;
	}

	ami_plot_setapen(glob, glob->rp, style->fill_colour);
	ami_arc_gfxlib(glob->rp, x, y, radius, angle1, angle2);

	return NSERROR_OK;
}


/**
 * Plots a circle
 *
 * Plot a circle centered on (x,y), which is optionally filled.
 *
 * \param ctx The current redraw context.
 * \param style Style controlling the circle plot.
 * \param x x coordinate of circle centre.
 * \param y y coordinate of circle centre.
 * \param radius circle radius.
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_disc(const struct redraw_context *ctx,
		const plot_style_t *style,
		int x, int y, int radius)
{
	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_disc()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	if (style->fill_type != PLOT_OP_TYPE_NONE) {
		ami_plot_setapen(glob, glob->rp, style->fill_colour);
		AreaCircle(glob->rp,x,y,radius);
		AreaEnd(glob->rp);
	}

	if (style->stroke_type != PLOT_OP_TYPE_NONE) {
		ami_plot_setapen(glob, glob->rp, style->stroke_colour);
		DrawEllipse(glob->rp,x,y,radius,radius);
	}

	return NSERROR_OK;
}


/**
 * Plots a line
 *
 * plot a line from (x0,y0) to (x1,y1). Coordinates are at
 *  centre of line width/thickness.
 *
 * \param ctx The current redraw context.
 * \param style Style controlling the line plot.
 * \param line A rectangle defining the line to be drawn
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_line(const struct redraw_context *ctx,
		const plot_style_t *style,
		const struct rect *line)
{
	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_line()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	glob->rp->PenWidth = plot_style_fixed_to_int(style->stroke_width);
	glob->rp->PenHeight = plot_style_fixed_to_int(style->stroke_width);

	switch (style->stroke_type) {
		case PLOT_OP_TYPE_SOLID: /**< Solid colour */
		default:
			glob->rp->LinePtrn = PATT_LINE;
		break;

		case PLOT_OP_TYPE_DOT: /**< Doted plot */
			glob->rp->LinePtrn = PATT_DOT;
		break;

		case PLOT_OP_TYPE_DASH: /**< dashed plot */
			glob->rp->LinePtrn = PATT_DASH;
		break;
	}

	ami_plot_setapen(glob, glob->rp, style->stroke_colour);
	Move(glob->rp, line->x0, line->y0);
	Draw(glob->rp, line->x1, line->y1);

	glob->rp->PenWidth = 1;
	glob->rp->PenHeight = 1;
	glob->rp->LinePtrn = PATT_LINE;

	return NSERROR_OK;
}


/**
 * Plots a rectangle.
 *
 * The rectangle can be filled an outline or both controlled
 *  by the plot style The line can be solid, dotted or
 *  dashed. Top left corner at (x0,y0) and rectangle has given
 *  width and height.
 *
 * \param ctx The current redraw context.
 * \param style Style controlling the rectangle plot.
 * \param rect A rectangle defining the line to be drawn
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_rectangle(const struct redraw_context *ctx,
		     const plot_style_t *style,
		     const struct rect *rect)
{
	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_rectangle()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	if (style->fill_type != PLOT_OP_TYPE_NONE) {
		ami_plot_setapen(glob, glob->rp, style->fill_colour);
		RectFill(glob->rp, rect->x0, rect->y0, rect->x1- 1 , rect->y1 - 1);
	}

	if (style->stroke_type != PLOT_OP_TYPE_NONE) {
		glob->rp->PenWidth = plot_style_fixed_to_int(style->stroke_width);
		glob->rp->PenHeight = plot_style_fixed_to_int(style->stroke_width);

		switch (style->stroke_type) {
			case PLOT_OP_TYPE_SOLID: /**< Solid colour */
			default:
				glob->rp->LinePtrn = PATT_LINE;
			break;

			case PLOT_OP_TYPE_DOT: /**< Dotted plot */
				glob->rp->LinePtrn = PATT_DOT;
			break;

			case PLOT_OP_TYPE_DASH: /**< dashed plot */
				glob->rp->LinePtrn = PATT_DASH;
			break;
 		}

		ami_plot_setapen(glob, glob->rp, style->stroke_colour);
		Move(glob->rp, rect->x0, rect->y0);
		Draw(glob->rp, rect->x1, rect->y0);
		Draw(glob->rp, rect->x1, rect->y1);
		Draw(glob->rp, rect->x0, rect->y1);
		Draw(glob->rp, rect->x0, rect->y0);

		glob->rp->PenWidth = 1;
		glob->rp->PenHeight = 1;
		glob->rp->LinePtrn = PATT_LINE;
	}

	return NSERROR_OK;
}


/**
 * Plot a polygon
 *
 * Plots a filled polygon with straight lines between
 * points. The lines around the edge of the ploygon are not
 * plotted. The polygon is filled with the non-zero winding
 * rule.
 *
 * \param ctx The current redraw context.
 * \param style Style controlling the polygon plot.
 * \param p verticies of polygon
 * \param n number of verticies.
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_polygon(const struct redraw_context *ctx,
		   const plot_style_t *style,
		   const int *p,
		   unsigned int n)
{
	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_polygon()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	ami_plot_setapen(glob, glob->rp, style->fill_colour);

	if (AreaMove(glob->rp,p[0],p[1]) == -1) {
		NSLOG(netsurf, INFO, "AreaMove: vector list full");
	}

	for (uint32 k = 1; k < n; k++) {
		if (AreaDraw(glob->rp,p[k*2],p[(k*2)+1]) == -1) {
			NSLOG(netsurf, INFO, "AreaDraw: vector list full");
		}
	}

	if (AreaEnd(glob->rp) == -1) {
		NSLOG(netsurf, INFO, "AreaEnd: error");
	}

	return NSERROR_OK;
}


/**
 * Plots a path.
 *
 * Path plot consisting of cubic Bezier curves. Line and fill colour is
 *  controlled by the plot style.
 *
 * \param ctx The current redraw context.
 * \param pstyle Style controlling the path plot.
 * \param p elements of path
 * \param n nunber of elements on path
 * \param transform A transform to apply to the path.
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_path(const struct redraw_context *ctx,
		const plot_style_t *pstyle,
		const float *p,
		unsigned int n,
		const float transform[6])
{
	unsigned int i;
	struct bez_point start_p = {0, 0}, cur_p = {0, 0}, p_a, p_b, p_c, p_r;

	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_path()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	if (n == 0) {
		return NSERROR_OK;
	}

	if (p[0] != PLOTTER_PATH_MOVE) {
		NSLOG(netsurf, INFO, "Path does not start with move");
		return NSERROR_INVALID;
	}

	if (pstyle->fill_colour != NS_TRANSPARENT) {
		ami_plot_setapen(glob, glob->rp, pstyle->fill_colour);
		if (pstyle->stroke_colour != NS_TRANSPARENT) {
			ami_plot_setopen(glob, glob->rp, pstyle->stroke_colour);
		}
	} else {
		if (pstyle->stroke_colour != NS_TRANSPARENT) {
			ami_plot_setapen(glob, glob->rp, pstyle->stroke_colour);
		} else {
			return NSERROR_OK; /* wholly transparent */
		}
	}

	/* Construct path */
	for (i = 0; i < n; ) {
		if (p[i] == PLOTTER_PATH_MOVE) {
			if (pstyle->fill_colour != NS_TRANSPARENT) {
				if (AreaMove(glob->rp, p[i+1], p[i+2]) == -1) {
					NSLOG(netsurf, INFO,
					      "AreaMove: vector list full");
				}
			} else {
				Move(glob->rp, p[i+1], p[i+2]);
			}
			/* Keep track for future Bezier curves/closes etc */
			start_p.x = p[i+1];
			start_p.y = p[i+2];
			cur_p.x = start_p.x;
			cur_p.y = start_p.y;
			i += 3;
		} else if (p[i] == PLOTTER_PATH_CLOSE) {
			if (pstyle->fill_colour != NS_TRANSPARENT) {
				if (AreaEnd(glob->rp) == -1) {
					NSLOG(netsurf, INFO, "AreaEnd: error");
				}
			} else {
				Draw(glob->rp, start_p.x, start_p.y);
			}
			i++;
		} else if (p[i] == PLOTTER_PATH_LINE) {
			if (pstyle->fill_colour != NS_TRANSPARENT) {
				if (AreaDraw(glob->rp, p[i+1], p[i+2]) == -1) {
					NSLOG(netsurf, INFO,
					      "AreaDraw: vector list full");
				}
			} else {
				Draw(glob->rp, p[i+1], p[i+2]);
			}
			cur_p.x = p[i+1];
			cur_p.y = p[i+2];
			i += 3;
		} else if (p[i] == PLOTTER_PATH_BEZIER) {
			p_a.x = p[i+1];
			p_a.y = p[i+2];
			p_b.x = p[i+3];
			p_b.y = p[i+4];
			p_c.x = p[i+5];
			p_c.y = p[i+6];

			for (float t = 0.0; t <= 1.0; t += 0.1) {
				ami_bezier(&cur_p, &p_a, &p_b, &p_c, t, &p_r);
				if (pstyle->fill_colour != NS_TRANSPARENT) {
					if (AreaDraw(glob->rp, p_r.x, p_r.y) == -1) {
						NSLOG(netsurf, INFO,
						      "AreaDraw: vector list full");
					}
				} else {
					Draw(glob->rp, p_r.x, p_r.y);
				}
			}
			cur_p.x = p_c.x;
			cur_p.y = p_c.y;
			i += 7;
		} else {
			NSLOG(netsurf, INFO, "bad path command %f", p[i]);
			/* End path for safety if using Area commands */
			if (pstyle->fill_colour != NS_TRANSPARENT) {
				AreaEnd(glob->rp);
				BNDRYOFF(glob->rp);
			}
			return NSERROR_INVALID;
		}
	}
	if (pstyle->fill_colour != NS_TRANSPARENT) {
		BNDRYOFF(glob->rp);
	}

	return NSERROR_OK;
}


/**
 * Plot a bitmap
 *
 * Tiled plot of a bitmap image. (x,y) gives the top left
 * coordinate of an explicitly placed tile. From this tile the
 * image can repeat in all four directions -- up, down, left
 * and right -- to the extents given by the current clip
 * rectangle.
 *
 * The bitmap_flags say whether to tile in the x and y
 * directions. If not tiling in x or y directions, the single
 * image is plotted. The width and height give the dimensions
 * the image is to be scaled to.
 *
 * \param ctx The current redraw context.
 * \param bitmap The bitmap to plot
 * \param x The x coordinate to plot the bitmap
 * \param y The y coordiante to plot the bitmap
 * \param width The width of area to plot the bitmap into
 * \param height The height of area to plot the bitmap into
 * \param bg the background colour to alpha blend into
 * \param flags the flags controlling the type of plot operation
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_bitmap_tile(const struct redraw_context *ctx,
		struct bitmap *bitmap,
		int x, int y,
		int width,
		int height,
		colour bg,
		bitmap_flags_t flags)
{
	int xf,yf,xm,ym,oy,ox;
	struct BitMap *tbm = NULL;
	struct Hook *bfh = NULL;
	struct bfbitmap bfbm;
	bool repeat_x = (flags & BITMAPF_REPEAT_X);
	bool repeat_y = (flags & BITMAPF_REPEAT_Y);

	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_bitmap_tile()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	if ((width == 0) || (height == 0)) {
		return NSERROR_OK;
	}

	if (!(repeat_x || repeat_y)) {
		return ami_bitmap(glob, x, y, width, height, bitmap);
	}

	/* If it is a one pixel transparent image, we are wasting our time */
	if ((amiga_bitmap_get_opaque(bitmap) == false) &&
	    (bitmap_get_width(bitmap) == 1) &&
	    (bitmap_get_height(bitmap) == 1)) {
		return NSERROR_OK;
	}

	tbm = ami_bitmap_get_native(bitmap, width, height, glob->palette_mapped, glob->rp->BitMap);
	if (!tbm) {
		return NSERROR_OK;
	}

	ox = x;
	oy = y;

	/* get left most tile position */
	for (; ox > 0; ox -= width)

	/* get top most tile position */
	for (; oy > 0; oy -= height);

	if (ox < 0) {
		ox = -ox;
	}
	if (oy < 0) {
		oy = -oy;
	}
	if (repeat_x) {
		xf = glob->rect.MaxX;
		xm = glob->rect.MinX;
	} else {
		xf = x + width;
		xm = x;
	}

	if (repeat_y) {
		yf = glob->rect.MaxY;
		ym = glob->rect.MinY;
	} else {
		yf = y + height;
		ym = y;
	}
#ifdef __amigaos4__
	if(amiga_bitmap_get_opaque(bitmap)) {
		bfh = CreateBackFillHook(BFHA_BitMap,tbm,
							BFHA_Width,width,
							BFHA_Height,height,
							BFHA_OffsetX,ox,
							BFHA_OffsetY,oy,
							TAG_DONE);
	} else
#endif
	{
		bfbm.bm = tbm;
		bfbm.width = width;
		bfbm.height = height;
		bfbm.offsetx = ox;
		bfbm.offsety = oy;
		bfbm.mask = ami_bitmap_get_mask(bitmap, width, height, tbm);
		bfbm.palette_mapped = glob->palette_mapped;
		bfh = calloc(1, sizeof(struct Hook));
		bfh->h_Entry = (HOOKFUNC)ami_bitmap_tile_hook;
		bfh->h_SubEntry = 0;
		bfh->h_Data = &bfbm;
	}

	InstallLayerHook(glob->rp->Layer,bfh);
	EraseRect(glob->rp,xm,ym,xf,yf);
	InstallLayerHook(glob->rp->Layer,LAYERS_NOBACKFILL);

#ifdef __amigaos4__
	if (amiga_bitmap_get_opaque(bitmap)) {
		DeleteBackFillHook(bfh);
	} else
#endif
		free(bfh);

	if ((ami_bitmap_is_nativebm(bitmap, tbm) == false)) {
		/**\todo is this logic logical? */
		ami_rtg_freebitmap(tbm);
	}

	return NSERROR_OK;
}


/**
 * Text plotting.
 *
 * \param ctx The current redraw context.
 * \param fstyle plot style for this text
 * \param x x coordinate
 * \param y y coordinate
 * \param text UTF-8 string to plot
 * \param length length of string, in bytes
 * \return NSERROR_OK on success else error code.
 */
static nserror
ami_text(const struct redraw_context *ctx,
		const struct plot_font_style *fstyle,
		int x,
		int y,
		const char *text,
		size_t length)
{
	NSLOG(plot, DEEPDEBUG, "[ami_plotter] Entered ami_text()");

	struct gui_globals *glob = (struct gui_globals *)ctx->priv;

	if (__builtin_expect(ami_nsfont == NULL, 0)) {
		return NSERROR_OK;
	}
	ami_plot_setapen(glob, glob->rp, fstyle->foreground);
	ami_nsfont->text(glob->rp, text, length, fstyle, x, y, nsoption_bool(font_antialiasing));

	return NSERROR_OK;
}


const struct plotter_table amiplot = {
	.rectangle = ami_rectangle,
	.line = ami_line,
	.polygon = ami_polygon,
	.clip = ami_clip,
	.text = ami_text,
	.disc = ami_disc,
	.arc = ami_arc,
	.bitmap = ami_bitmap_tile,
	.path = ami_path,
	.option_knockout = true,
};