forked from MapServer/MapServer
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathmapdrawgdal.c
2451 lines (2077 loc) · 86.3 KB
/
mapdrawgdal.c
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
/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Code for drawing GDAL raster layers. Called from
* msDrawRasterLayerLow() in mapraster.c.
* Author: Frank Warmerdam, [email protected]
*
******************************************************************************
* Copyright (c) 1996-2005 Regents of the University of Minnesota.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <assert.h>
#include "mapserver.h"
#include "mapresample.h"
#include "mapthread.h"
extern int InvGeoTransform( double *gt_in, double *gt_out );
#define MAXCOLORS 256
#define GEO_TRANS(tr,x,y) ((tr)[0]+(tr)[1]*(x)+(tr)[2]*(y))
#if defined(USE_GDAL)
#include "gdal.h"
#include "cpl_string.h"
#include "gdal_alg.h"
static int
LoadGDALImages( GDALDatasetH hDS, int band_numbers[4], int band_count,
layerObj *layer,
int src_xoff, int src_yoff, int src_xsize, int src_ysize,
GByte *pabyBuffer,
int dst_xsize, int dst_ysize,
int *pbHaveRGBNoData,
int *pnNoData1, int *pnNoData2, int *pnNoData3 );
static int
msDrawRasterLayerGDAL_RawMode(
mapObj *map, layerObj *layer, imageObj *image, GDALDatasetH hDS,
int src_xoff, int src_yoff, int src_xsize, int src_ysize,
int dst_xoff, int dst_yoff, int dst_xsize, int dst_ysize );
static int
msDrawRasterLayerGDAL_16BitClassification(
mapObj *map, layerObj *layer, rasterBufferObj *rb,
GDALDatasetH hDS, GDALRasterBandH hBand,
int src_xoff, int src_yoff, int src_xsize, int src_ysize,
int dst_xoff, int dst_yoff, int dst_xsize, int dst_ysize );
#ifdef USE_GD
static void Dither24to8( GByte *pabyRed, GByte *pabyGreen, GByte *pabyBlue,
GByte *pabyDithered, int xsize, int ysize,
int bTransparent, colorObj transparentColor,
gdImagePtr gdImg );
/*
* Stuff for allocating color cubes, and mapping between RGB values and
* the corresponding color cube index.
*/
static int allocColorCube(mapObj *map, gdImagePtr img, int *panColorCube);
#endif
#define RED_LEVELS 5
#define RED_DIV 52
/* #define GREEN_LEVELS 7 */
#define GREEN_LEVELS 5
/* #define GREEN_DIV 37 */
#define GREEN_DIV 52
#define BLUE_LEVELS 5
#define BLUE_DIV 52
#define RGB_LEVEL_INDEX(r,g,b) ((r)*GREEN_LEVELS*BLUE_LEVELS + (g)*BLUE_LEVELS+(b))
#define RGB_INDEX(r,g,b) RGB_LEVEL_INDEX(((r)/RED_DIV),((g)/GREEN_DIV),((b)/BLUE_DIV))
/*
* rasterBufferObj setting macros.
*/
/************************************************************************/
/* msDrawRasterLayerGDAL() */
/************************************************************************/
int msDrawRasterLayerGDAL(mapObj *map, layerObj *layer, imageObj *image,
rasterBufferObj *rb, void *hDSVoid )
{
int i,j, k; /* loop counters */
int cmap[MAXCOLORS];
#ifndef NDEBUG
int cmap_set = FALSE;
#endif
unsigned char rb_cmap[4][MAXCOLORS];
double adfGeoTransform[6], adfInvGeoTransform[6];
int dst_xoff, dst_yoff, dst_xsize, dst_ysize;
int src_xoff, src_yoff, src_xsize, src_ysize;
double llx, lly, urx, ury;
rectObj copyRect, mapRect;
unsigned char *pabyRaw1=NULL, *pabyRaw2=NULL, *pabyRaw3=NULL,
*pabyRawAlpha = NULL;
int classified = FALSE;
int red_band=0, green_band=0, blue_band=0, alpha_band=0;
int band_count, band_numbers[4];
GDALDatasetH hDS = hDSVoid;
GDALColorTableH hColorMap;
GDALRasterBandH hBand1=NULL, hBand2=NULL, hBand3=NULL, hBandAlpha=NULL;
int bHaveRGBNoData = FALSE;
int nNoData1=-1,nNoData2=-1,nNoData3=-1;
#ifdef USE_GD
int anColorCube[256];
int cmt=0;
/*make sure we don't have a truecolor gd image*/
assert(!rb || rb->type != MS_BUFFER_GD || !gdImageTrueColor(rb->data.gd_img));
#endif
/*only support rawdata and pluggable renderers*/
assert(MS_RENDERER_RAWDATA(image->format) || (MS_RENDERER_PLUGIN(image->format) && rb));
memset( cmap, 0xff, MAXCOLORS * sizeof(int) );
memset( rb_cmap, 0, sizeof(rb_cmap) );
/* -------------------------------------------------------------------- */
/* Test the image format instead of the map format. */
/* Normally the map format and the image format should be the */
/* same but In somes cases like swf and pdf support, a temporary */
/* GD image object is created and used to render raster layers */
/* and then dumped into the SWF or the PDF file. */
/* -------------------------------------------------------------------- */
src_xsize = GDALGetRasterXSize( hDS );
src_ysize = GDALGetRasterYSize( hDS );
/*
* If the RAW_WINDOW attribute is set, use that to establish what to
* load. This is normally just set by the mapresample.c module to avoid
* problems with rotated maps.
*/
if( CSLFetchNameValue( layer->processing, "RAW_WINDOW" ) != NULL ) {
char **papszTokens =
CSLTokenizeString(
CSLFetchNameValue( layer->processing, "RAW_WINDOW" ) );
if( layer->debug )
msDebug( "msDrawGDAL(%s): using RAW_WINDOW=%s, dst=0,0,%d,%d\n",
layer->name,
CSLFetchNameValue( layer->processing, "RAW_WINDOW" ),
image->width, image->height );
if( CSLCount(papszTokens) != 4 ) {
CSLDestroy( papszTokens );
msSetError( MS_IMGERR, "RAW_WINDOW PROCESSING directive corrupt.",
"msDrawGDAL()" );
return -1;
}
src_xoff = atoi(papszTokens[0]);
src_yoff = atoi(papszTokens[1]);
src_xsize = atoi(papszTokens[2]);
src_ysize = atoi(papszTokens[3]);
dst_xoff = 0;
dst_yoff = 0;
dst_xsize = image->width;
dst_ysize = image->height;
CSLDestroy( papszTokens );
}
/*
* Compute the georeferenced window of overlap, and do nothing if there
* is no overlap between the map extents, and the file we are operating on.
*/
else if( layer->transform ) {
int dst_lrx, dst_lry;
if( layer->debug )
msDebug( "msDrawRasterLayerGDAL(): Entering transform.\n" );
msGetGDALGeoTransform( hDS, map, layer, adfGeoTransform );
InvGeoTransform( adfGeoTransform, adfInvGeoTransform );
mapRect = map->extent;
mapRect.minx -= map->cellsize*0.5;
mapRect.maxx += map->cellsize*0.5;
mapRect.miny -= map->cellsize*0.5;
mapRect.maxy += map->cellsize*0.5;
copyRect = mapRect;
if( copyRect.minx < GEO_TRANS(adfGeoTransform,0,src_ysize) )
copyRect.minx = GEO_TRANS(adfGeoTransform,0,src_ysize);
if( copyRect.maxx > GEO_TRANS(adfGeoTransform,src_xsize,0) )
copyRect.maxx = GEO_TRANS(adfGeoTransform,src_xsize,0);
if( copyRect.miny < GEO_TRANS(adfGeoTransform+3,0,src_ysize) )
copyRect.miny = GEO_TRANS(adfGeoTransform+3,0,src_ysize);
if( copyRect.maxy > GEO_TRANS(adfGeoTransform+3,src_xsize,0) )
copyRect.maxy = GEO_TRANS(adfGeoTransform+3,src_xsize,0);
if( copyRect.minx >= copyRect.maxx || copyRect.miny >= copyRect.maxy ) {
if( layer->debug )
msDebug( "msDrawRasterLayerGDAL(): Error in overlap calculation.\n" );
return 0;
}
/*
* Copy the source and destination raster coordinates.
*/
llx = GEO_TRANS(adfInvGeoTransform+0,copyRect.minx,copyRect.miny);
lly = GEO_TRANS(adfInvGeoTransform+3,copyRect.minx,copyRect.miny);
urx = GEO_TRANS(adfInvGeoTransform+0,copyRect.maxx,copyRect.maxy);
ury = GEO_TRANS(adfInvGeoTransform+3,copyRect.maxx,copyRect.maxy);
src_xoff = MAX(0,(int) floor(llx+0.5));
src_yoff = MAX(0,(int) floor(ury+0.5));
src_xsize = MIN(MAX(0,(int) (urx - llx + 0.5)),
GDALGetRasterXSize(hDS) - src_xoff);
src_ysize = MIN(MAX(0,(int) (lly - ury + 0.5)),
GDALGetRasterYSize(hDS) - src_yoff);
/* We want very small windows to use at least one source pixel (#4172) */
if( src_xsize == 0 && (urx - llx) > 0.0 ) {
src_xsize = 1;
src_xoff = MIN(src_xoff,GDALGetRasterXSize(hDS)-1);
}
if( src_ysize == 0 && (lly - ury) > 0.0 ) {
src_ysize = 1;
src_yoff = MIN(src_yoff,GDALGetRasterYSize(hDS)-1);
}
if( src_xsize == 0 || src_ysize == 0 ) {
if( layer->debug )
msDebug( "msDrawRasterLayerGDAL(): no apparent overlap between map view and this window(1).\n" );
return 0;
}
if (map->cellsize == 0) {
if( layer->debug )
msDebug( "msDrawRasterLayerGDAL(): Cellsize can't be 0.\n" );
return 0;
}
dst_xoff = (int) ((copyRect.minx - mapRect.minx) / map->cellsize);
dst_yoff = (int) ((mapRect.maxy - copyRect.maxy) / map->cellsize);
dst_lrx = (int) ((copyRect.maxx - mapRect.minx) / map->cellsize + 0.5);
dst_lry = (int) ((mapRect.maxy - copyRect.miny) / map->cellsize + 0.5);
dst_lrx = MAX(0,MIN(image->width,dst_lrx));
dst_lry = MAX(0,MIN(image->height,dst_lry));
dst_xsize = MAX(0,MIN(image->width,dst_lrx - dst_xoff));
dst_ysize = MAX(0,MIN(image->height,dst_lry - dst_yoff));
if( dst_xsize == 0 || dst_ysize == 0 ) {
if( layer->debug )
msDebug( "msDrawRasterLayerGDAL(): no apparent overlap between map view and this window(2).\n" );
return 0;
}
if( layer->debug )
msDebug( "msDrawRasterLayerGDAL(): src=%d,%d,%d,%d, dst=%d,%d,%d,%d\n",
src_xoff, src_yoff, src_xsize, src_ysize,
dst_xoff, dst_yoff, dst_xsize, dst_ysize );
#ifndef notdef
if( layer->debug ) {
double d_src_xoff, d_src_yoff, geo_x, geo_y;
geo_x = mapRect.minx + dst_xoff * map->cellsize;
geo_y = mapRect.maxy - dst_yoff * map->cellsize;
d_src_xoff = (geo_x - adfGeoTransform[0]) / adfGeoTransform[1];
d_src_yoff = (geo_y - adfGeoTransform[3]) / adfGeoTransform[5];
msDebug( "msDrawRasterLayerGDAL(): source raster PL (%.3f,%.3f) for dst PL (%d,%d).\n",
d_src_xoff, d_src_yoff,
dst_xoff, dst_yoff );
}
#endif
}
/*
* If layer transforms are turned off, just map 1:1.
*/
else {
dst_xoff = src_xoff = 0;
dst_yoff = src_yoff = 0;
dst_xsize = src_xsize = MIN(image->width,src_xsize);
dst_ysize = src_ysize = MIN(image->height,src_ysize);
}
/*
* In RAWDATA mode we don't fool with colors. Do the raw processing,
* and return from the function early.
*/
if( MS_RENDERER_RAWDATA( image->format ) ) {
return msDrawRasterLayerGDAL_RawMode(
map, layer, image, hDS,
src_xoff, src_yoff, src_xsize, src_ysize,
dst_xoff, dst_yoff, dst_xsize, dst_ysize );
}
/*
* Is this image classified? We consider it classified if there are
* classes with an expression string *or* a color range. We don't want
* to treat the raster as classified if there is just a bogus class here
* to force inclusion in the legend.
*/
for( i = 0; i < layer->numclasses; i++ ) {
int s;
/* change colour based on colour range? */
for(s=0; s<layer->class[i]->numstyles; s++) {
if( MS_VALID_COLOR(layer->class[i]->styles[s]->mincolor)
&& MS_VALID_COLOR(layer->class[i]->styles[s]->maxcolor) ) {
classified = TRUE;
break;
}
}
if( layer->class[i]->expression.string != NULL ) {
classified = TRUE;
break;
}
}
/*
* Set up the band selection. We look for a BANDS directive in the
* the PROCESSING options. If not found we default to red=1 or
* red=1,green=2,blue=3 or red=1,green=2,blue=3,alpha=4.
*/
if( CSLFetchNameValue( layer->processing, "BANDS" ) == NULL ) {
red_band = 1;
if( GDALGetRasterCount( hDS ) >= 4
&& GDALGetRasterColorInterpretation(
GDALGetRasterBand( hDS, 4 ) ) == GCI_AlphaBand )
alpha_band = 4;
if( GDALGetRasterCount( hDS ) >= 3 ) {
green_band = 2;
blue_band = 3;
}
if( GDALGetRasterCount( hDS ) == 2
&& GDALGetRasterColorInterpretation(
GDALGetRasterBand( hDS, 2 ) ) == GCI_AlphaBand )
alpha_band = 2;
hBand1 = GDALGetRasterBand( hDS, red_band );
if( classified
|| GDALGetRasterColorTable( hBand1 ) != NULL ) {
alpha_band = 0;
green_band = 0;
blue_band = 0;
}
} else {
int *band_list;
band_list = msGetGDALBandList( layer, hDS, 4, &band_count );
if( band_list == NULL )
return -1;
if( band_count > 0 )
red_band = band_list[0];
else
red_band = 0;
if( band_count > 2 ) {
green_band = band_list[1];
blue_band = band_list[2];
} else {
green_band = 0;
blue_band = 0;
}
if( band_count > 3 )
alpha_band = band_list[3];
else
alpha_band = 0;
free( band_list );
}
band_numbers[0] = red_band;
band_numbers[1] = green_band;
band_numbers[2] = blue_band;
band_numbers[3] = 0;
if( blue_band != 0 && alpha_band != 0 ) {
band_numbers[3] = alpha_band;
band_count = 4;
} else if( blue_band != 0 && alpha_band == 0 )
band_count = 3;
else if( alpha_band != 0 ) {
band_numbers[1] = alpha_band;
band_count = 2;
} else
band_count = 1;
if( layer->debug > 1 || (layer->debug > 0 && green_band != 0) ) {
msDebug( "msDrawRasterLayerGDAL(): red,green,blue,alpha bands = %d,%d,%d,%d\n",
red_band, green_band, blue_band, alpha_band );
}
/*
* Get band handles for PC256, RGB or RGBA cases.
*/
hBand1 = GDALGetRasterBand( hDS, red_band );
if( hBand1 == NULL )
return -1;
hBand2 = hBand3 = hBandAlpha = NULL;
if( green_band != 0 ) {
hBand1 = GDALGetRasterBand( hDS, red_band );
hBand2 = GDALGetRasterBand( hDS, green_band );
hBand3 = GDALGetRasterBand( hDS, blue_band );
if( hBand1 == NULL || hBand2 == NULL || hBand3 == NULL )
return -1;
}
if( alpha_band != 0 )
hBandAlpha = GDALGetRasterBand( hDS, alpha_band );
#ifdef USE_GD
/*
* Wipe pen indicators for all our layer class colors if they exist.
* Sometimes temporary gdImg'es are used in which case previously allocated
* pens won't generally apply. See Bug 504.
*/
if( rb->type == MS_BUFFER_GD ) {
int iClass;
int iStyle;
for( iClass = 0; iClass < layer->numclasses; iClass++ ) {
for (iStyle=0; iStyle<layer->class[iClass]->numstyles; iStyle++)
layer->class[iClass]->styles[iStyle]->color.pen = MS_PEN_UNSET;
}
}
#endif
/*
* The logic for a classification rendering of non-8bit raster bands
* is sufficiently different than the normal mechanism of loading
* into an 8bit buffer, that we isolate it into it's own subfunction.
*/
if( classified
&& hBand1 != NULL && GDALGetRasterDataType( hBand1 ) != GDT_Byte ) {
return msDrawRasterLayerGDAL_16BitClassification(
map, layer, rb, hDS, hBand1,
src_xoff, src_yoff, src_xsize, src_ysize,
dst_xoff, dst_yoff, dst_xsize, dst_ysize );
}
/*
* Get colormap for this image. If there isn't one, and we have only
* one band create a greyscale colormap.
*/
if( hBand2 != NULL )
hColorMap = NULL;
else {
hColorMap = GDALGetRasterColorTable( hBand1 );
if( hColorMap != NULL )
hColorMap = GDALCloneColorTable( hColorMap );
else if( hBand2 == NULL ) {
hColorMap = GDALCreateColorTable( GPI_RGB );
for( i = 0; i < 256; i++ ) {
colorObj pixel;
GDALColorEntry sEntry;
pixel.red = i;
pixel.green = i;
pixel.blue = i;
#ifdef USE_GD
pixel.pen = i;
#endif
if(MS_COMPARE_COLORS(pixel, layer->offsite)) {
sEntry.c1 = 0;
sEntry.c2 = 0;
sEntry.c3 = 0;
sEntry.c4 = 0; /* alpha set to zero */
} else if( rb->type != MS_BUFFER_GD ) {
sEntry.c1 = i;
sEntry.c2 = i;
sEntry.c3 = i;
sEntry.c4 = 255;
} else {
/*
** This special calculation is intended to use only 128
** unique colors for greyscale in non-truecolor mode.
*/
sEntry.c1 = i - i%2;
sEntry.c2 = i - i%2;
sEntry.c3 = i - i%2;
sEntry.c4 = 255;
}
GDALSetColorEntry( hColorMap, i, &sEntry );
}
}
/*
** If we have a known NODATA value, mark it now as transparent.
*/
{
int bGotNoData;
double dfNoDataValue = msGetGDALNoDataValue( layer, hBand1,
&bGotNoData);
if( bGotNoData && dfNoDataValue >= 0
&& dfNoDataValue < GDALGetColorEntryCount( hColorMap ) ) {
GDALColorEntry sEntry;
memcpy( &sEntry,
GDALGetColorEntry( hColorMap, (int) dfNoDataValue ),
sizeof(GDALColorEntry) );
sEntry.c4 = 0;
GDALSetColorEntry( hColorMap, (int) dfNoDataValue, &sEntry );
}
}
}
/*
* Setup the mapping between source eight bit pixel values, and the
* output images color table. There are two general cases, where the
* class colors are provided by the MAP file, or where we use the native
* color table.
*/
if( classified ) {
int c, color_count;
#ifndef NDEBUG
cmap_set = TRUE;
#endif
if( hColorMap == NULL ) {
msSetError(MS_IOERR,
"Attempt to classify 24bit image, this is unsupported.",
"drawGDAL()");
return -1;
}
color_count = MIN(256,GDALGetColorEntryCount(hColorMap));
for(i=0; i < color_count; i++) {
colorObj pixel;
int colormap_index;
GDALColorEntry sEntry;
GDALGetColorEntryAsRGB( hColorMap, i, &sEntry );
pixel.red = sEntry.c1;
pixel.green = sEntry.c2;
pixel.blue = sEntry.c3;
colormap_index = i;
if(!MS_COMPARE_COLORS(pixel, layer->offsite)) {
c = msGetClass(layer, &pixel, colormap_index);
if(c == -1) { /* doesn't belong to any class, so handle like offsite*/
if( rb->type == MS_BUFFER_GD )
cmap[i] = -1;
} else {
int s;
/* change colour based on colour range? Currently we
only address the greyscale case properly. */
for(s=0; s<layer->class[c]->numstyles; s++) {
if( MS_VALID_COLOR(layer->class[c]->styles[s]->mincolor)
&& MS_VALID_COLOR(layer->class[c]->styles[s]->maxcolor) )
msValueToRange(layer->class[c]->styles[s],
sEntry.c1 );
}
#ifdef USE_GD
if( rb->type == MS_BUFFER_GD ) {
RESOLVE_PEN_GD(rb->data.gd_img, layer->class[c]->styles[0]->color);
if( MS_TRANSPARENT_COLOR(layer->class[c]->styles[0]->color) )
cmap[i] = -1;
else if( MS_VALID_COLOR(layer->class[c]->styles[0]->color)) {
/* use class color */
cmap[i] = layer->class[c]->styles[0]->color.pen;
} else /* Use raster color */
cmap[i] = msAddColorGD(map, rb->data.gd_img, cmt,
pixel.red, pixel.green, pixel.blue);
} else if( rb->type == MS_BUFFER_BYTE_RGBA )
#endif
{
if( MS_TRANSPARENT_COLOR(layer->class[c]->styles[0]->color))
/* leave it transparent */;
else if( MS_VALID_COLOR(layer->class[c]->styles[0]->color)) {
rb_cmap[0][i] = layer->class[c]->styles[0]->color.red;
rb_cmap[1][i] = layer->class[c]->styles[0]->color.green;
rb_cmap[2][i] = layer->class[c]->styles[0]->color.blue;
rb_cmap[3][i] = (255*layer->class[c]->styles[0]->opacity / 100);
}
else { /* Use raster color */
rb_cmap[0][i] = pixel.red;
rb_cmap[1][i] = pixel.green;
rb_cmap[2][i] = pixel.blue;
rb_cmap[3][i] = 255;
}
}
}
#ifdef USE_GD
} else {
if( rb->type == MS_BUFFER_GD )
cmap[i] = -1;
#endif
}
}
#ifdef USE_GD
} else if( hColorMap != NULL && rb->type == MS_BUFFER_GD ) {
int color_count;
#ifndef NDEBUG
cmap_set = TRUE;
#endif
color_count = MIN(256,GDALGetColorEntryCount(hColorMap));
for(i=0; i < color_count; i++) {
GDALColorEntry sEntry;
GDALGetColorEntryAsRGB( hColorMap, i, &sEntry );
if( sEntry.c4 != 0
&& (!MS_VALID_COLOR( layer->offsite )
|| layer->offsite.red != sEntry.c1
|| layer->offsite.green != sEntry.c2
|| layer->offsite.blue != sEntry.c3 ) )
cmap[i] = msAddColorGD(map, rb->data.gd_img, cmt,
sEntry.c1, sEntry.c2, sEntry.c3);
else
cmap[i] = -1;
}
#endif
} else if( hBand2 == NULL && hColorMap != NULL && rb->type == MS_BUFFER_BYTE_RGBA ) {
int color_count;
#ifndef NDEBUG
cmap_set = TRUE;
#endif
color_count = MIN(256,GDALGetColorEntryCount(hColorMap));
for(i=0; i < color_count; i++) {
GDALColorEntry sEntry;
GDALGetColorEntryAsRGB( hColorMap, i, &sEntry );
if( sEntry.c4 != 0
&& (!MS_VALID_COLOR( layer->offsite )
|| layer->offsite.red != sEntry.c1
|| layer->offsite.green != sEntry.c2
|| layer->offsite.blue != sEntry.c3 ) ) {
rb_cmap[0][i] = sEntry.c1;
rb_cmap[1][i] = sEntry.c2;
rb_cmap[2][i] = sEntry.c3;
rb_cmap[3][i] = sEntry.c4;
}
}
}
#ifdef USE_GD
else if( rb->type == MS_BUFFER_GD ) {
allocColorCube( map, rb->data.gd_img, anColorCube );
}
#endif
/*
* Allocate imagery buffers.
*/
pabyRaw1 = (unsigned char *) malloc(dst_xsize * dst_ysize * band_count);
if( pabyRaw1 == NULL ) {
msSetError(MS_MEMERR, "Allocating work image of size %dx%dx%d failed.",
"msDrawRasterLayerGDAL()", dst_xsize, dst_ysize, band_count );
return -1;
}
if( hBand2 != NULL && hBand3 != NULL ) {
pabyRaw2 = pabyRaw1 + dst_xsize * dst_ysize * 1;
pabyRaw3 = pabyRaw1 + dst_xsize * dst_ysize * 2;
}
if( hBandAlpha != NULL ) {
if( hBand2 != NULL )
pabyRawAlpha = pabyRaw1 + dst_xsize * dst_ysize * 3;
else
pabyRawAlpha = pabyRaw1 + dst_xsize * dst_ysize * 1;
}
/*
* Load image data into buffers with scaling, etc.
*/
if( LoadGDALImages( hDS, band_numbers, band_count, layer,
src_xoff, src_yoff, src_xsize, src_ysize,
pabyRaw1, dst_xsize, dst_ysize,
&bHaveRGBNoData,
&nNoData1, &nNoData2, &nNoData3 ) == -1 ) {
free( pabyRaw1 );
return -1;
}
if( bHaveRGBNoData && layer->debug )
msDebug( "msDrawGDAL(): using RGB nodata values from GDAL dataset.\n" );
/* -------------------------------------------------------------------- */
/* If there was no alpha band, but we have a dataset level mask */
/* load it as massage it so it will function as our alpha for */
/* transparency purposes. */
/* -------------------------------------------------------------------- */
if( hBandAlpha == NULL ) {
int nMaskFlags = GDALGetMaskFlags(hBand1);
if( (CSLFetchNameValue( layer->processing, "BANDS" ) == NULL ) &&
(nMaskFlags & GMF_PER_DATASET) != 0 &&
(nMaskFlags & (GMF_NODATA|GMF_ALL_VALID)) == 0 ) {
CPLErr eErr;
if( layer->debug )
msDebug( "msDrawGDAL(): using GDAL mask band for alpha.\n" );
band_count++;
pabyRaw1 = (unsigned char *)
realloc(pabyRaw1,dst_xsize * dst_ysize * band_count);
if( pabyRaw1 == NULL ) {
msSetError(MS_MEMERR,
"Allocating work image of size %dx%dx%d failed.",
"msDrawRasterLayerGDAL()",
dst_xsize, dst_ysize, band_count );
return -1;
}
if( hBand2 != NULL ) {
pabyRaw2 = pabyRaw1 + dst_xsize * dst_ysize * 1;
pabyRaw3 = pabyRaw1 + dst_xsize * dst_ysize * 2;
pabyRawAlpha = pabyRaw1 + dst_xsize * dst_ysize * 3;
} else {
pabyRawAlpha = pabyRaw1 + dst_xsize * dst_ysize * 1;
}
hBandAlpha = GDALGetMaskBand(hBand1);
eErr = GDALRasterIO( hBandAlpha, GF_Read,
src_xoff, src_yoff, src_xsize, src_ysize,
pabyRawAlpha, dst_xsize, dst_ysize, GDT_Byte, 0,0);
if( eErr != CE_None ) {
msSetError( MS_IOERR, "GDALRasterIO() failed: %s",
"drawGDAL()", CPLGetLastErrorMsg() );
free( pabyRaw1 );
return -1;
}
/* In case the mask is not an alpha channel, expand values of 1 to 255, */
/* so we can deal as it was an alpha band afterwards */
if ((nMaskFlags & GMF_ALPHA) == 0) {
for(i=0; i<dst_xsize * dst_ysize; i++)
if (pabyRawAlpha[i])
pabyRawAlpha[i] = 255;
}
}
}
#ifdef USE_GD
/* -------------------------------------------------------------------- */
/* Single band plus colormap with alpha blending to 8bit. */
/* -------------------------------------------------------------------- */
if( hBand2 == NULL && rb->type == MS_BUFFER_GD && hBandAlpha != NULL ) {
assert( cmap_set );
k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
int result, alpha;
for( j = dst_xoff; j < dst_xoff + dst_xsize; j++ ) {
alpha = pabyRawAlpha[k];
result = cmap[pabyRaw1[k++]];
/*
** We don't do alpha blending in non-truecolor mode, just
** threshold the point on/off at alpha=128.
*/
if( result != -1 && alpha >= 128 )
rb->data.gd_img->pixels[i][j] = result;
}
}
assert( k == dst_xsize * dst_ysize );
}
/* -------------------------------------------------------------------- */
/* Single band plus colormap (no alpha) to 8bit. */
/* -------------------------------------------------------------------- */
else if( hBand2 == NULL && rb->type == MS_BUFFER_GD ) {
assert( cmap_set );
k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
int result;
for( j = dst_xoff; j < dst_xoff + dst_xsize; j++ ) {
result = cmap[pabyRaw1[k++]];
if( result != -1 ) {
rb->data.gd_img->pixels[i][j] = result;
}
}
}
assert( k == dst_xsize * dst_ysize );
} else
#endif
/* -------------------------------------------------------------------- */
/* Single band plus colormap and alpha to truecolor. (RB) */
/* -------------------------------------------------------------------- */
if( hBand2 == NULL && rb->type == MS_BUFFER_BYTE_RGBA && hBandAlpha != NULL ) {
assert( cmap_set );
k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
for( j = dst_xoff; j < dst_xoff + dst_xsize; j++ ) {
int src_pixel, src_alpha, cmap_alpha, merged_alpha;
src_pixel = pabyRaw1[k];
src_alpha = pabyRawAlpha[k];
cmap_alpha = rb_cmap[3][src_pixel];
merged_alpha = (src_alpha * cmap_alpha) / 255;
if( merged_alpha < 2 )
/* do nothing - transparent */;
else if( merged_alpha > 253 ) {
RB_SET_PIXEL( rb, j, i,
rb_cmap[0][src_pixel],
rb_cmap[1][src_pixel],
rb_cmap[2][src_pixel],
cmap_alpha );
} else {
RB_MIX_PIXEL( rb, j, i,
rb_cmap[0][src_pixel],
rb_cmap[1][src_pixel],
rb_cmap[2][src_pixel],
merged_alpha );
}
k++;
}
}
}
/* -------------------------------------------------------------------- */
/* Single band plus colormap (no alpha) to truecolor (RB) */
/* -------------------------------------------------------------------- */
else if( hBand2 == NULL && rb->type == MS_BUFFER_BYTE_RGBA ) {
assert( cmap_set );
k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
for( j = dst_xoff; j < dst_xoff + dst_xsize; j++ ) {
int src_pixel = pabyRaw1[k++];
if( rb_cmap[3][src_pixel] > 253 ) {
RB_SET_PIXEL( rb, j, i,
rb_cmap[0][src_pixel],
rb_cmap[1][src_pixel],
rb_cmap[2][src_pixel],
rb_cmap[3][src_pixel] );
} else if( rb_cmap[3][src_pixel] > 1 ) {
RB_MIX_PIXEL( rb, j, i,
rb_cmap[0][src_pixel],
rb_cmap[1][src_pixel],
rb_cmap[2][src_pixel],
rb_cmap[3][src_pixel] );
}
}
}
}
/* -------------------------------------------------------------------- */
/* Input is 3 band RGB. Alpha blending is mixed into the loop */
/* since this case is less commonly used and has lots of other */
/* overhead. (RB) */
/* -------------------------------------------------------------------- */
else if( hBand3 != NULL && rb->type == MS_BUFFER_BYTE_RGBA ) {
k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
for( j = dst_xoff; j < dst_xoff + dst_xsize; j++, k++ ) {
if( MS_VALID_COLOR( layer->offsite )
&& pabyRaw1[k] == layer->offsite.red
&& pabyRaw2[k] == layer->offsite.green
&& pabyRaw3[k] == layer->offsite.blue )
continue;
if( bHaveRGBNoData
&& pabyRaw1[k] == nNoData1
&& pabyRaw2[k] == nNoData2
&& pabyRaw3[k] == nNoData3 )
continue;
if( pabyRawAlpha == NULL || pabyRawAlpha[k] == 255 ) {
RB_SET_PIXEL( rb, j, i,
pabyRaw1[k],
pabyRaw2[k],
pabyRaw3[k],
255 );
} else if( pabyRawAlpha[k] != 0 ) {
RB_MIX_PIXEL( rb, j, i,
pabyRaw1[k],
pabyRaw2[k],
pabyRaw3[k],
pabyRawAlpha[k] );
}
}
}
}
#ifdef USE_GD
/* -------------------------------------------------------------------- */
/* Input is 3 band RGB. Alpha blending is mixed into the loop */
/* since this case is less commonly used and has lots of other */
/* overhead. (GD) */
/* -------------------------------------------------------------------- */
else if( hBand3 != NULL && rb->type == MS_BUFFER_GD ) {
/* Dithered 24bit to 8bit conversion */
if( CSLFetchBoolean( layer->processing, "DITHER", FALSE ) ) {
unsigned char *pabyDithered;
pabyDithered = (unsigned char *) malloc(dst_xsize * dst_ysize);
if( pabyDithered == NULL ) {
msSetError(MS_MEMERR, "Allocating work image of size %dx%d failed.",
"msDrawRasterLayerGDAL()", dst_xsize, dst_ysize );
return -1;
}
Dither24to8( pabyRaw1, pabyRaw2, pabyRaw3, pabyDithered,
dst_xsize, dst_ysize, image->format->transparent,
map->imagecolor, rb->data.gd_img );
k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
for( j = dst_xoff; j < dst_xoff + dst_xsize; j++, k++ ) {
if( MS_VALID_COLOR( layer->offsite )
&& pabyRaw1[k] == layer->offsite.red
&& pabyRaw2[k] == layer->offsite.green
&& pabyRaw3[k] == layer->offsite.blue )
continue;
if( bHaveRGBNoData
&& pabyRaw1[k] == nNoData1
&& pabyRaw2[k] == nNoData2
&& pabyRaw3[k] == nNoData3 )
continue;
if( pabyRawAlpha != NULL && pabyRawAlpha[k] == 0 )
continue;
rb->data.gd_img->pixels[i][j] = pabyDithered[k];
}
}
free( pabyDithered );
}
/* Color cubed 24bit to 8bit conversion. */
else if( rb->type == MS_BUFFER_GD ) {
k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {