mapdrawgdal.c 86.9 KB
Newer Older
1
/******************************************************************************
2
 * $Id$
3 4
 *
 * Project:  MapServer
5 6
 * Purpose:  Code for drawing GDAL raster layers.  Called from
 *           msDrawRasterLayerLow() in mapraster.c.
7 8 9 10 11 12 13 14 15 16 17 18
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * 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:
 *
19
 * The above copyright notice and this permission notice shall be included in
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
 * 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"

36

37 38 39 40 41

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))
42
#define SKIP_MASK(x,y) (mask_rb && !*(mask_rb->data.rgba.a+(y)*mask_rb->data.rgba.row_step+(x)*mask_rb->data.rgba.pixel_step))
43 44 45 46 47 48 49 50 51 52

#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,
53 54 55 56 57
                layerObj *layer,
                int src_xoff, int src_yoff, int src_xsize, int src_ysize,
                GByte *pabyBuffer,
                int dst_xsize, int dst_ysize,
                int *pbHaveRGBNoData,
58
                int *pnNoData1, int *pnNoData2, int *pnNoData3 );
59
static int
60
msDrawRasterLayerGDAL_RawMode(
61 62 63
  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 );
64

65
static int
66
msDrawRasterLayerGDAL_16BitClassification(
67 68 69 70
  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 );
71

72
#ifdef USE_GD
73
static void Dither24to8( GByte *pabyRed, GByte *pabyGreen, GByte *pabyBlue,
74
                         GByte *pabyDithered, int xsize, int ysize,
75 76 77 78 79 80 81 82
                         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);
83 84
#endif

85 86 87 88 89 90 91 92 93 94 95 96 97

#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))

98
/*
99
 * rasterBufferObj setting macros.
100 101 102 103
 */



104 105 106 107
/************************************************************************/
/*                       msDrawRasterLayerGDAL()                        */
/************************************************************************/

108
int msDrawRasterLayerGDAL(mapObj *map, layerObj *layer, imageObj *image,
109
                          rasterBufferObj *rb, void *hDSVoid )
110 111

{
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132
  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;
133
  rasterBufferObj *mask_rb = NULL;
134 135 136 137 138 139
#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
140 141 142 143 144 145 146 147
  if(layer->mask) {
    int ret;
    layerObj *maskLayer = GET_LAYER(map, msGetLayerIndex(map,layer->mask));
    mask_rb = msSmallCalloc(1,sizeof(rasterBufferObj)); 
    ret = MS_IMAGE_RENDERER(maskLayer->maskimage)->getRasterBufferHandle(maskLayer->maskimage,mask_rb);
    if(ret != MS_SUCCESS)
      return -1;
  }
148

149 150 151 152 153 154 155 156 157 158 159 160 161 162
  /*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.                   */
  /* -------------------------------------------------------------------- */
163 164


165 166
  src_xsize = GDALGetRasterXSize( hDS );
  src_ysize = GDALGetRasterYSize( hDS );
167

168 169 170 171 172
  /*
   * 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.
   */
173

174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
  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;
190 191
    }

192 193 194 195
    src_xoff = atoi(papszTokens[0]);
    src_yoff = atoi(papszTokens[1]);
    src_xsize = atoi(papszTokens[2]);
    src_ysize = atoi(papszTokens[3]);
196

197 198 199 200
    dst_xoff = 0;
    dst_yoff = 0;
    dst_xsize = image->width;
    dst_ysize = image->height;
201

202 203
    CSLDestroy( papszTokens );
  }
204

205 206 207 208 209 210
  /*
   * 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;
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
    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;
241 242 243
    }

    /*
244
     * Copy the source and destination raster coordinates.
245
     */
246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265
    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);
266 267
    }

268 269 270 271
    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;
272
    }
273 274 275 276 277

    if (map->cellsize == 0) {
      if( layer->debug )
        msDebug( "msDrawRasterLayerGDAL(): Cellsize can't be 0.\n" );
      return 0;
278 279
    }

280 281
    dst_xoff = (int) ((copyRect.minx - mapRect.minx) / map->cellsize);
    dst_yoff = (int) ((mapRect.maxy - copyRect.maxy) / map->cellsize);
282

283 284 285 286
    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));
287

288 289 290 291 292 293 294
    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;
295 296
    }

297 298 299 300 301 302 303
    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;
304

305 306
      geo_x = mapRect.minx + dst_xoff * map->cellsize;
      geo_y = mapRect.maxy - dst_yoff * map->cellsize;
307

308 309 310 311 312 313
      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 );
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
#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;
393
    }
394 395 396 397 398 399 400 401 402
  } 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];
403
    else
404 405 406 407 408 409 410
      red_band = 0;
    if( band_count > 2 ) {
      green_band = band_list[1];
      blue_band = band_list[2];
    } else {
      green_band = 0;
      blue_band = 0;
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
    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 ) {
452
    hBand1 = GDALGetRasterBand( hDS, red_band );
453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
    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
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
  /*
   * 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 );
503

504 505 506
      for( i = 0; i < 256; i++ ) {
        colorObj pixel;
        GDALColorEntry sEntry;
507

508 509 510 511 512 513
        pixel.red = i;
        pixel.green = i;
        pixel.blue = i;
#ifdef USE_GD
        pixel.pen = i;
#endif
514

515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534
        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;
535
        }
536 537 538

        GDALSetColorEntry( hColorMap, i, &sEntry );
      }
539 540 541
    }

    /*
542 543
    ** If we have a known NODATA value, mark it now as transparent.
    */
544
    {
545 546 547 548 549 550 551 552 553 554 555 556 557 558 559
      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 );
      }
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
  /*
   * 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);
636 637
            }

638 639 640 641 642
            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;
643
            }
644
          }
645
        }
646 647 648 649 650 651
#ifdef USE_GD
      } else {
        if( rb->type == MS_BUFFER_GD )
          cmap[i] = -1;
#endif
      }
652
    }
653 654 655 656 657 658
#ifdef USE_GD
  } else if( hColorMap != NULL && rb->type == MS_BUFFER_GD ) {
    int color_count;
#ifndef NDEBUG
    cmap_set = TRUE;
#endif
659

660
    color_count = MIN(256,GDALGetColorEntryCount(hColorMap));
661

662 663
    for(i=0; i < color_count; i++) {
      GDALColorEntry sEntry;
664

665
      GDALGetColorEntryAsRGB( hColorMap, i, &sEntry );
666

667 668 669 670 671 672 673 674 675
      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;
676
    }
677 678 679 680 681 682
#endif
  } else if( hBand2 == NULL && hColorMap != NULL && rb->type == MS_BUFFER_BYTE_RGBA ) {
    int color_count;
#ifndef NDEBUG
    cmap_set = TRUE;
#endif
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
    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 );
772
        return -1;
773
      }
774

775
      if( hBand2 != NULL ) {
776 777
        pabyRaw2 = pabyRaw1 + dst_xsize * dst_ysize * 1;
        pabyRaw3 = pabyRaw1 + dst_xsize * dst_ysize * 2;
778 779 780 781
        pabyRawAlpha = pabyRaw1 + dst_xsize * dst_ysize * 3;
      } else {
        pabyRawAlpha = pabyRaw1 + dst_xsize * dst_ysize * 1;
      }
782

783
      hBandAlpha = GDALGetMaskBand(hBand1);
784

785 786 787 788 789 790 791
      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() );
792 793
        free( pabyRaw1 );
        return -1;
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
      }

      /* 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;
813

814 815
    for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
      int result, alpha;
816

817 818
      for( j = dst_xoff; j < dst_xoff + dst_xsize; j++ ) {
        alpha = pabyRawAlpha[k];
819

820
        result = cmap[pabyRaw1[k++]];
821 822 823
        if(SKIP_MASK(j,i)) {
          continue;
        }
824

825 826 827 828
        /*
        ** We don't do alpha blending in non-truecolor mode, just
        ** threshold the point on/off at alpha=128.
        */
829

830 831 832 833
        if( result != -1 && alpha >= 128 )
          rb->data.gd_img->pixels[i][j] = result;
      }
    }
834

835 836
    assert( k == dst_xsize * dst_ysize );
  }
837

838 839 840 841 842 843
  /* -------------------------------------------------------------------- */
  /*      Single band plus colormap (no alpha) to 8bit.                   */
  /* -------------------------------------------------------------------- */
  else if( hBand2 == NULL  && rb->type == MS_BUFFER_GD ) {
    assert( cmap_set );
    k = 0;
844

845 846
    for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
      int result;
847

848 849
      for( j = dst_xoff; j < dst_xoff + dst_xsize; j++ ) {
        result = cmap[pabyRaw1[k++]];
850 851 852
        if(SKIP_MASK(j,i)) {
          continue;
        }
853 854
        if( result != -1 ) {
          rb->data.gd_img->pixels[i][j] = result;
855
        }
856
      }
857 858
    }

859 860 861
    assert( k == dst_xsize * dst_ysize );
  } else
#endif
862

863 864 865 866 867 868 869 870 871 872
    /* -------------------------------------------------------------------- */
    /*      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;
873 874 875 876
          if(SKIP_MASK(j,i)) {
            k++;
            continue;
          }
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899

          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++;
900
        }
901 902 903 904 905 906 907 908 909 910 911 912 913
      }
    }

  /* -------------------------------------------------------------------- */
  /*      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++];
914 915 916
          if(SKIP_MASK(j,i)) {
            continue;
          }
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

          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++ ) {
944 945 946
          if(SKIP_MASK(j,i)) {
            continue;
          }
947 948 949 950 951
          if( MS_VALID_COLOR( layer->offsite )
              && pabyRaw1[k] == layer->offsite.red
              && pabyRaw2[k] == layer->offsite.green
              && pabyRaw3[k] == layer->offsite.blue )
            continue;
952

953 954 955 956 957
          if( bHaveRGBNoData
              && pabyRaw1[k] == nNoData1
              && pabyRaw2[k] == nNoData2
              && pabyRaw3[k] == nNoData3 )
            continue;
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
          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;
992
        }
993

994 995 996 997
        Dither24to8( pabyRaw1, pabyRaw2, pabyRaw3, pabyDithered,
                     dst_xsize, dst_ysize, image->format->transparent,
                     map->imagecolor, rb->data.gd_img );

998
        k = 0;
999 1000
        for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
          for( j = dst_xoff; j < dst_xoff + dst_xsize; j++, k++ ) {
1001 1002 1003
            if(SKIP_MASK(j,i)) {
              continue;
            }
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
            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];
          }
1021 1022
        }

1023 1024
        free( pabyDithered );
      }
1025

1026 1027 1028 1029 1030 1031
      /* 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++ ) {
          for( j = dst_xoff; j < dst_xoff + dst_xsize; j++, k++ ) {
            int cc_index;
1032 1033 1034
            if(SKIP_MASK(j,i)) {
              continue;
            }
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053

            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;

            cc_index= RGB_INDEX(pabyRaw1[k],pabyRaw2[k],pabyRaw3[k]);
            rb->data.gd_img->pixels[i][j] = anColorCube[cc_index];
          }
1054
        }
1055 1056 1057 1058
      } else {
        msSetError(MS_MISCERR,"Unsupported raster configuration","msDrawRasterLayerGDAL()");
        return MS_FAILURE;
      }
1059
    }
1060
#endif
1061

1062 1063 1064
  /*
  ** Cleanup
  */
1065

1066
  msFree( mask_rb );
1067
  free( pabyRaw1 );
1068

1069 1070
  if( hColorMap != NULL )
    GDALDestroyColorTable( hColorMap );
1071

1072
  return 0;
1073 1074 1075 1076 1077 1078 1079 1080 1081
}

/************************************************************************/
/*                          ParseDefaultLUT()                           */
/************************************************************************/

static int ParseDefaultLUT( const char *lut_def, GByte *lut )

{
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
  const char *lut_read;
  int last_in=0, last_out=0, all_done=FALSE;

  /* -------------------------------------------------------------------- */
  /*      Parse definition, applying to lut on the fly.                   */
  /* -------------------------------------------------------------------- */
  lut_read = lut_def;
  while( !all_done ) {
    int this_in=0, this_out=0;
    int lut_i;

    while( isspace(*lut_read) )
      lut_read++;

    /* if we are at end, assum 255:255 */
    if( *lut_read == '\0' ) {
      all_done = TRUE;
      if ( last_in != 255 ) {
        this_in = 255;
        this_out = 255;
      }
    }

    /* otherwise read "in:out", and skip past */
    else {
      this_in = atoi(lut_read);
      while( *lut_read != ':' && *lut_read )
        lut_read++;
      if( *lut_read == ':' )
        lut_read++;
      while( isspace(*lut_read) )
        lut_read++;
      this_out = atoi(lut_read);
      while( *lut_read && *lut_read != ',' && *lut_read != '\n' )
        lut_read++;
      if( *lut_read == ',' || *lut_read == '\n' )
        lut_read++;
      while( isspace(*lut_read) )
        lut_read++;
    }

    this_in = MAX(0,MIN(255,this_in));
    this_out = MAX(0,MIN(255,this_out));

    /* apply linear values from last in:out to this in:out */
    for( lut_i = last_in; lut_i <= this_in; lut_i++ ) {
      double ratio;

      if( last_in == this_in )
        ratio = 1.0;
      else
        ratio = (lut_i - last_in) / (double) (this_in - last_in);

      lut[lut_i] = (int)
                   floor(((1.0 - ratio)*last_out + ratio*this_out) + 0.5);
    }

    last_in = this_in;
    last_out = this_out;
  }

  return 0;
1144 1145 1146 1147 1148 1149 1150 1151 1152
}

/************************************************************************/
/*                          LutFromGimpLine()                           */
/************************************************************************/

static int LutFromGimpLine( char *lut_line, GByte *lut )

{
1153 1154 1155
  char wrkLUTDef[1000];
  int  i, count = 0;
  char **tokens;
1156

1157 1158 1159 1160
  /* cleanup white space at end of line (DOS LF, etc) */
  i = strlen(lut_line) - 1;
  while( i > 0 && isspace(lut_line[i]) )
    lut_line[i--] = '\0';
1161

1162 1163
  while( *lut_line == 10 || *lut_line == 13 )
    lut_line++;
1164

1165 1166 1167
  /* tokenize line */
  tokens = CSLTokenizeString( lut_line );
  if( CSLCount(tokens) != 17 * 2 ) {
1168
    CSLDestroy( tokens );
1169 1170 1171 1172 1173
    msSetError(MS_MISCERR,
               "GIMP curve file appears corrupt.",
               "LutFromGimpLine()" );
    return -1;
  }
1174

1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
  /* Convert to our own format */
  wrkLUTDef[0] = '\0';
  for( i = 0; i < 17; i++ ) {
    if( atoi(tokens[i*2]) >= 0 ) {
      if( count++ > 0 )
        strlcat( wrkLUTDef, ",", sizeof(wrkLUTDef));

      snprintf( wrkLUTDef + strlen(wrkLUTDef), sizeof(wrkLUTDef)-strlen(wrkLUTDef),
                "%s:%s", tokens[i*2], tokens[i*2+1] );
    }
  }

  CSLDestroy( tokens );

  return ParseDefaultLUT( wrkLUTDef, lut );
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
}

/************************************************************************/
/*                            ParseGimpLUT()                            */
/*                                                                      */
/*      Parse a Gimp style LUT.                                         */
/************************************************************************/

static int ParseGimpLUT( const char *lut_def, GByte *lut, int iColorIndex )

{
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
  int i;
  GByte lutValue[256];
  GByte lutColorBand[256];
  char **lines =
    CSLTokenizeStringComplex( lut_def, "\n", FALSE, FALSE );

  if( !EQUALN(lines[0],"# GIMP Curves File",18)
      || CSLCount(lines) < 6 ) {
    msSetError(MS_MISCERR,
               "GIMP curve file appears corrupt.",
               "ParseGimpLUT()" );
    return -1;
  }
1214

1215 1216 1217 1218 1219
  /*
   * Convert the overall curve, and the color band specific curve into LUTs.
   */
  if( LutFromGimpLine( lines[1], lutValue ) != 0
      || LutFromGimpLine( lines[iColorIndex + 1], lutColorBand ) != 0 ) {
1220
    CSLDestroy( lines );
1221 1222 1223
    return -1;
  }
  CSLDestroy( lines );
1224

1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
  /*
   * Compose the two luts as if the raw value passed through the color band
   * specific lut, and then the general value lut.  Usually one or the
   * other will be the identity mapping, but not always.
   */

  for( i = 0; i < 256; i++ ) {
    lut[i] = lutValue[lutColorBand[i]];
  }

  return 0;
1236 1237 1238 1239 1240 1241 1242 1243
}

/************************************************************************/
/*                              ApplyLUT()                              */
/*                                                                      */
/*      Apply a LUT according to RFC 21.                                */
/************************************************************************/

1244
static int ApplyLUT( int iColorIndex, layerObj *layer,
1245 1246 1247
                     GByte *buffer, int buf_xsize, int buf_ysize )

{
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
  const char *lut_def;
  char key[20], lut_def_fromfile[2500];
  GByte lut[256];
  int   err, i;

  /* -------------------------------------------------------------------- */
  /*      Get lut specifier from processing directives.  Do nothing if    */
  /*      none are found.                                                 */
  /* -------------------------------------------------------------------- */
  sprintf( key, "LUT_%d", iColorIndex );
  lut_def = msLayerGetProcessingKey( layer, key );
  if( lut_def == NULL )
    lut_def = msLayerGetProcessingKey( layer, "LUT" );
  if( lut_def == NULL )
1262
    return 0;
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286

  /* -------------------------------------------------------------------- */
  /*      Does this look like a file?  If so, read it into memory.        */
  /* -------------------------------------------------------------------- */
  if( strspn(lut_def,"0123456789:, ") != strlen(lut_def) ) {
    FILE *fp;
    char path[MS_MAXPATHLEN];
    int len;
    msBuildPath(path, layer->map->mappath, lut_def);
    fp = fopen( path, "rb" );
    if( fp == NULL ) {
      msSetError(MS_IOERR,
                 "Failed to open LUT file '%s'.",
                 "drawGDAL()", path );
      return -1;
    }

    len = fread( lut_def_fromfile, 1, sizeof(lut_def_fromfile), fp );
    fclose( fp );

    if( len == sizeof(lut_def_fromfile) ) {
      msSetError(MS_IOERR,
                 "LUT definition from file %s longer than maximum buffer size (%d bytes).",
                 "drawGDAL()",
1287
                 path, (int)sizeof(lut_def_fromfile) );
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
      return -1;
    }

    lut_def_fromfile[len] = '\0';

    lut_def = lut_def_fromfile;
  }

  /* -------------------------------------------------------------------- */
  /*      Parse the LUT description.                                      */
  /* -------------------------------------------------------------------- */
  if( EQUALN(lut_def,"# GIMP",6) ) {
    err = ParseGimpLUT( lut_def, lut, iColorIndex );
  } else {
    err = ParseDefaultLUT( lut_def, lut );
  }

  if( err != 0 )
    return err;

  /* -------------------------------------------------------------------- */
  /*      Apply LUT.                                                      */
  /* -------------------------------------------------------------------- */
  for( i = buf_xsize * buf_ysize - 1; i >= 0; i-- )
    buffer[i] = lut[buffer[i]];

  return 0;
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
}

/************************************************************************/
/*                           LoadGDALImages()                           */
/*                                                                      */
/*      This call will load and process 1-4 bands of input for the      */
/*      selected rectangle, loading the result into the passed 8bit     */
/*      buffer.  The processing options include scaling.                */
/************************************************************************/

static int
LoadGDALImages( GDALDatasetH hDS, int band_numbers[4], int band_count,
1327 1328 1329 1330 1331
                layerObj *layer,
                int src_xoff, int src_yoff, int src_xsize, int src_ysize,
                GByte *pabyWholeBuffer,
                int dst_xsize, int dst_ysize,
                int *pbHaveRGBNoData,
1332
                int *pnNoData1, int *pnNoData2, int *pnNoData3 )
1333

1334
{
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
  int    iColorIndex, result_code=0;
  CPLErr eErr;
  float *pafWholeRawData;

  /* -------------------------------------------------------------------- */
  /*      If we have no alpha band, but we do have three input            */
  /*      bands, then check for nodata values.  If we only have one       */
  /*      input band, then nodata will already have been adderssed as     */
  /*      part of the real or manufactured color table.                   */
  /* -------------------------------------------------------------------- */
  if( band_count == 3 ) {
    *pnNoData1 = (int)
                 msGetGDALNoDataValue( layer,
                                       GDALGetRasterBand(hDS,band_numbers[0]),
                                       pbHaveRGBNoData);

    if( *pbHaveRGBNoData )
      *pnNoData2 = (int)
                   msGetGDALNoDataValue( layer,
                                         GDALGetRasterBand(hDS,band_numbers[1]),
                                         pbHaveRGBNoData);
    if( *pbHaveRGBNoData )
      *pnNoData3 = (int)
                   msGetGDALNoDataValue( layer,
                                         GDALGetRasterBand(hDS,band_numbers[2]),
                                         pbHaveRGBNoData);
  }

  /* -------------------------------------------------------------------- */
  /*      Are we doing a simple, non-scaling case?  If so, read directly  */
  /*      and return.                                                     */
  /* -------------------------------------------------------------------- */
  if( CSLFetchNameValue( layer->processing, "SCALE" ) == NULL
      && CSLFetchNameValue( layer->processing, "SCALE_1" ) == NULL
      && CSLFetchNameValue( layer->processing, "SCALE_2" ) == NULL
      && CSLFetchNameValue( layer->processing, "SCALE_3" ) == NULL
      && CSLFetchNameValue( layer->processing, "SCALE_4" ) == NULL ) {
    eErr = GDALDatasetRasterIO( hDS, GF_Read,
                                src_xoff, src_yoff, src_xsize, src_ysize,
                                pabyWholeBuffer,
                                dst_xsize, dst_ysize, GDT_Byte,
                                band_count, band_numbers,
                                0,0,0);

    if( eErr != CE_None ) {
      msSetError( MS_IOERR,
                  "GDALDatasetRasterIO() failed: %s",
                  "drawGDAL()",
                  CPLGetLastErrorMsg() );
      return -1;
    }

    for( iColorIndex = 0;
         iColorIndex < band_count && result_code == 0; iColorIndex++ ) {
      result_code = ApplyLUT( iColorIndex+1, layer,
                              pabyWholeBuffer
                              + dst_xsize*dst_ysize*iColorIndex,
                              dst_xsize, dst_ysize );
1393 1394
    }

1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
    return result_code;
  }

  /* -------------------------------------------------------------------- */
  /*      Disable use of nodata if we are doing scaling.                  */
  /* -------------------------------------------------------------------- */
  *pbHaveRGBNoData = FALSE;

  /* -------------------------------------------------------------------- */
  /*      We need to do some scaling.  Will load into either a 16bit      */
  /*      unsigned or a floating point buffer depending on the source     */
  /*      data.  We offer a special case for 16U data because it is       */
  /*      common and it is a substantial win to avoid alot of floating    */
  /*      point operations on it.                                         */
  /* -------------------------------------------------------------------- */
  /* TODO */

  /* -------------------------------------------------------------------- */
  /*      Allocate the raw imagery buffer, and load into it (band         */
  /*      interleaved).                                                   */
  /* -------------------------------------------------------------------- */
  pafWholeRawData =
    (float *) malloc(sizeof(float) * dst_xsize * dst_ysize * band_count );

  if( pafWholeRawData == NULL ) {
    msSetError(MS_MEMERR,
               "Allocating work float image of size %dx%dx%d failed.",
               "msDrawRasterLayerGDAL()",
               dst_xsize, dst_ysize, band_count );
    return -1;
  }
1426

1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
  eErr = GDALDatasetRasterIO(
           hDS, GF_Read,
           src_xoff, src_yoff, src_xsize, src_ysize,
           pafWholeRawData, dst_xsize, dst_ysize, GDT_Float32,
           band_count, band_numbers,
           0, 0, 0 );

  if( eErr != CE_None ) {
    msSetError( MS_IOERR, "GDALDatasetRasterIO() failed: %s",
                "drawGDAL()",
                CPLGetLastErrorMsg() );

    free( pafWholeRawData );
    return -1;
  }

  /* -------------------------------------------------------------------- */
  /*      Fetch the scale processing option.                              */
  /* -------------------------------------------------------------------- */
  for( iColorIndex = 0; iColorIndex < band_count; iColorIndex++ ) {
    unsigned char *pabyBuffer;
    double dfScaleMin=0.0, dfScaleMax=255.0, dfScaleRatio, dfNoDataValue;
    const char *pszScaleInfo;
    float *pafRawData;
    int   nPixelCount = dst_xsize * dst_ysize, i, bGotNoData = FALSE;
    GDALRasterBandH hBand =GDALGetRasterBand(hDS,band_numbers[iColorIndex]);
    pszScaleInfo = CSLFetchNameValue( layer->processing, "SCALE" );
    if( pszScaleInfo == NULL ) {
      char szBandScalingName[20];

      sprintf( szBandScalingName, "SCALE_%d", iColorIndex+1 );
      pszScaleInfo = CSLFetchNameValue( layer->processing,
                                        szBandScalingName);
1460
    }
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470

    if( pszScaleInfo != NULL ) {
      char **papszTokens;

      papszTokens = CSLTokenizeStringComplex( pszScaleInfo, " ,",
                                              FALSE, FALSE );
      if( CSLCount(papszTokens) == 1
          && EQUAL(papszTokens[0],"AUTO") ) {
        dfScaleMin = dfScaleMax = 0.0;
      } else if( CSLCount(papszTokens) != 2 ) {
1471
        free( pafWholeRawData );
1472 1473 1474 1475
        msSetError( MS_MISCERR,
                    "SCALE PROCESSING option unparsable for layer %s.",
                    "msDrawGDAL()",
                    layer->name );
1476
        return -1;
1477 1478 1479 1480 1481
      } else {
        dfScaleMin = atof(papszTokens[0]);
        dfScaleMax = atof(papszTokens[1]);
      }
      CSLDestroy( papszTokens );
1482 1483
    }

1484 1485 1486 1487 1488 1489
    /* -------------------------------------------------------------------- */
    /*      If we are using autoscaling, then compute the max and min       */
    /*      now.  Perhaps we should eventually honour the offsite value     */
    /*      as a nodata value, or get it from GDAL.                         */
    /* -------------------------------------------------------------------- */
    pafRawData = pafWholeRawData + iColorIndex * dst_xsize * dst_ysize;
1490

1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
    dfNoDataValue = msGetGDALNoDataValue( layer, hBand, &bGotNoData );

    if( dfScaleMin == dfScaleMax ) {
      int bMinMaxSet = 0;

      /* we force assignment to a float rather than letting pafRawData[i]
         get promoted to double later to avoid float precision issues. */
      float fNoDataValue = (float) dfNoDataValue;

      for( i = 0; i < nPixelCount; i++ ) {
        if( bGotNoData && pafRawData[i] == fNoDataValue )
          continue;

        if( !bMinMaxSet ) {
          dfScaleMin = dfScaleMax = pafRawData[i];
          bMinMaxSet = TRUE;
1507 1508
        }

1509 1510 1511
        dfScaleMin = MIN(dfScaleMin,pafRawData[i]);
        dfScaleMax = MAX(dfScaleMax,pafRawData[i]);
      }
1512

1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563
      if( dfScaleMin == dfScaleMax )
        dfScaleMax = dfScaleMin + 1.0;
    }

    if( layer->debug > 0 )
      msDebug( "msDrawGDAL(%s): scaling to 8bit, src range=%g,%g\n",
               layer->name, dfScaleMin, dfScaleMax );

    /* -------------------------------------------------------------------- */
    /*      Now process the data.                                           */
    /* -------------------------------------------------------------------- */
    dfScaleRatio = 256.0 / (dfScaleMax - dfScaleMin);
    pabyBuffer = pabyWholeBuffer + iColorIndex * nPixelCount;

    for( i = 0; i < nPixelCount; i++ ) {
      float fScaledValue = (float) ((pafRawData[i]-dfScaleMin)*dfScaleRatio);

      if( fScaledValue < 0.0 )
        pabyBuffer[i] = 0;
      else if( fScaledValue > 255.0 )
        pabyBuffer[i] = 255;
      else
        pabyBuffer[i] = (int) fScaledValue;
    }

    /* -------------------------------------------------------------------- */
    /*      Report a warning if NODATA keyword was applied.  We are         */
    /*      unable to utilize it since we can't return any pixels marked    */
    /*      as nodata from this function.  Need to fix someday.             */
    /* -------------------------------------------------------------------- */
    if( bGotNoData )
      msDebug( "LoadGDALImage(%s): NODATA value %g in GDAL\n"
               "file or PROCESSING directive largely ignored.  Not yet fully supported for\n"
               "unclassified scaled data.  The NODATA value is excluded from auto-scaling\n"
               "min/max computation, but will not be transparent.\n",
               layer->name, dfNoDataValue );

    /* -------------------------------------------------------------------- */
    /*      Apply LUT if there is one.                                      */
    /* -------------------------------------------------------------------- */
    result_code = ApplyLUT( iColorIndex+1, layer,
                            pabyBuffer, dst_xsize, dst_ysize );;
    if( result_code == -1 ) {
      free( pafWholeRawData );
      return result_code;
    }
  }

  free( pafWholeRawData );

  return result_code;
1564 1565
}

1566
#ifdef USE_GD
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
/************************************************************************/
/*                           allocColorCube()                           */
/*                                                                      */
/*      Allocate color table entries as best possible for a color       */
/*      cube.                                                           */
/************************************************************************/

static int allocColorCube(mapObj *map, gdImagePtr img, int *panColorCube)

{
1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
  int  r, g, b;
  int i = 0;
  int nGreyColors = 32;
  int nSpaceGreyColors = 8;
  int iColors = 0;
  int red, green, blue;

  for( r = 0; r < RED_LEVELS; r++ ) {
    for( g = 0; g < GREEN_LEVELS; g++ ) {
      for( b = 0; b < BLUE_LEVELS; b++ ) {
        red = MS_MIN(255,r * (255 / (RED_LEVELS-1)));
        green = MS_MIN(255,g * (255 / (GREEN_LEVELS-1)));
        blue = MS_MIN(255,b * (255 / (BLUE_LEVELS-1)));

        panColorCube[RGB_LEVEL_INDEX(r,g,b)] =
          msAddColorGD(map, img, 1, red, green, blue );
        iColors++;
      }
    }
  }
  /* -------------------------------------------------------------------- */
  /*      Adding 32 grey colors                                           */
  /* -------------------------------------------------------------------- */
  for (i=0; i<nGreyColors; i++) {
    red = i*nSpaceGreyColors;
    green = red;
    blue = red;
    if(iColors < 256) {
      panColorCube[iColors] = msAddColorGD(map,img,1,red,green,blue);
      iColors++;
    }
  }
  return MS_SUCCESS;
1610 1611 1612 1613 1614 1615 1616 1617 1618
}

/************************************************************************/
/*                            Dither24to8()                             */
/*                                                                      */
/*      Wrapper for GDAL dithering algorithm.                           */
/************************************************************************/

static void Dither24to8( GByte *pabyRed, GByte *pabyGreen, GByte *pabyBlue,
1619
                         GByte *pabyDithered, int xsize, int ysize,
1620 1621 1622 1623
                         int bTransparent, colorObj transparent,
                         gdImagePtr gdImg )

{
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
  GDALDatasetH hDS;
  GDALDriverH  hDriver;
  char **papszBandOptions = NULL;
  char szDataPointer[120];
  GDALColorTableH hCT;
  int c;

  /* -------------------------------------------------------------------- */
  /*      Create the "memory" GDAL dataset referencing our working        */
  /*      arrays.                                                         */
  /* -------------------------------------------------------------------- */
  hDriver = GDALGetDriverByName( "MEM" );
  if( hDriver == NULL )
    return;

  hDS = GDALCreate( hDriver, "TempDitherDS", xsize, ysize, 0, GDT_Byte,
                    NULL );

  /* Add Red Band */
  memset( szDataPointer, 0, sizeof(szDataPointer) );
  CPLPrintPointer( szDataPointer, pabyRed, sizeof(szDataPointer) );
  papszBandOptions = CSLSetNameValue( papszBandOptions, "DATAPOINTER",
                                      szDataPointer );
  GDALAddBand( hDS, GDT_Byte, papszBandOptions );

  /* Add Green Band */
  memset( szDataPointer, 0, sizeof(szDataPointer) );
  CPLPrintPointer( szDataPointer, pabyGreen, sizeof(szDataPointer) );
  papszBandOptions = CSLSetNameValue( papszBandOptions, "DATAPOINTER",
                                      szDataPointer );
  GDALAddBand( hDS, GDT_Byte, papszBandOptions );

  /* Add Blue Band */
  memset( szDataPointer, 0, sizeof(szDataPointer) );
  CPLPrintPointer( szDataPointer, pabyBlue, sizeof(szDataPointer) );
  papszBandOptions = CSLSetNameValue( papszBandOptions, "DATAPOINTER",
                                      szDataPointer );
  GDALAddBand( hDS, GDT_Byte, papszBandOptions );

  /* Add Dithered Band */
  memset( szDataPointer, 0, sizeof(szDataPointer) );
  CPLPrintPointer( szDataPointer, pabyDithered, sizeof(szDataPointer) );
  papszBandOptions = CSLSetNameValue( papszBandOptions, "DATAPOINTER",
                                      szDataPointer );
  GDALAddBand( hDS, GDT_Byte, papszBandOptions );

  CSLDestroy( papszBandOptions );

  /* -------------------------------------------------------------------- */
  /*      Create the color table.                                         */
  /* -------------------------------------------------------------------- */
  hCT = GDALCreateColorTable( GPI_RGB );

  for (c = 0; c < gdImg->colorsTotal; c++) {
    GDALColorEntry sEntry;

    sEntry.c1 = gdImg->red[c];
    sEntry.c2 = gdImg->green[c];
    sEntry.c3 = gdImg->blue[c];

    if( bTransparent
        && transparent.red == sEntry.c1
        && transparent.green == sEntry.c2
        && transparent.blue == sEntry.c3 )
      sEntry.c4 = 0;
    else
      sEntry.c4 = 255;

    GDALSetColorEntry( hCT, c, &sEntry );
  }

  /* -------------------------------------------------------------------- */
  /*      Perform dithering.                                              */
  /* -------------------------------------------------------------------- */
  GDALDitherRGB2PCT( GDALGetRasterBand( hDS, 1 ),
                     GDALGetRasterBand( hDS, 2 ),
                     GDALGetRasterBand( hDS, 3 ),
                     GDALGetRasterBand( hDS, 4 ),
                     hCT, NULL, NULL );

  /* -------------------------------------------------------------------- */
  /*      Cleanup.                                                        */
  /* -------------------------------------------------------------------- */
  GDALDestroyColorTable( hCT );
  GDALClose( hDS );
1709
}
1710 1711
#endif

1712 1713 1714 1715 1716 1717 1718 1719 1720

/************************************************************************/
/*                       msGetGDALGeoTransform()                        */
/*                                                                      */
/*      Cover function that tries GDALGetGeoTransform(), a world        */
/*      file or OWS extents.  It is assumed that TLOCK_GDAL is held     */
/*      before this function is called.                                 */
/************************************************************************/

1721
int msGetGDALGeoTransform( GDALDatasetH hDS, mapObj *map, layerObj *layer,
1722 1723 1724
                           double *padfGeoTransform )

{
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
  const char *extent_priority = NULL;
  const char *value;
  const char *gdalDesc;
  const char *fullPath;
  char *fileExtension = NULL;
  char szPath[MS_MAXPATHLEN];
  int fullPathLen;
  int success = 0;
  rectObj  rect;

  /* -------------------------------------------------------------------- */
  /*      some GDAL drivers (ie. GIF) don't set geotransform on failure.  */
  /* -------------------------------------------------------------------- */
  padfGeoTransform[0] = 0.0;
  padfGeoTransform[1] = 1.0;
  padfGeoTransform[2] = 0.0;
  padfGeoTransform[3] = GDALGetRasterYSize(hDS);
  padfGeoTransform[4] = 0.0;
  padfGeoTransform[5] = -1.0;

  /* -------------------------------------------------------------------- */
  /*      Do we want to override GDAL with a worldfile if one is present? */
  /* -------------------------------------------------------------------- */
  extent_priority = CSLFetchNameValue( layer->processing,
                                       "EXTENT_PRIORITY" );

  if( extent_priority != NULL
      && EQUALN(extent_priority,"WORLD",5) ) {
    /* is there a user configured worldfile? */
    value = CSLFetchNameValue( layer->processing, "WORLDFILE" );

    if( value != NULL ) {
      /* at this point, fullPath may be a filePath or path only */
      fullPath = msBuildPath(szPath, map->mappath, value);

      /* fullPath is a path only, so let's append the dataset filename */
      if( strrchr(szPath,'.') == NULL ) {
        fullPathLen = strlen(fullPath);
        gdalDesc = msStripPath((char*)GDALGetDescription(hDS));

        if ( (fullPathLen + strlen(gdalDesc)) < MS_MAXPATHLEN ) {
          strcpy((char*)(fullPath + fullPathLen), gdalDesc);
        } else {
          msDebug("Path length to alternative worldfile exceeds MS_MAXPATHLEN.\n");
          fullPath = NULL;
1770
        }
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
      }
      /* fullPath has a filename included, so get the extension */
      else {
        fileExtension = msStrdup(strrchr(szPath,'.') + 1);
      }
    }
    /* common behaviour with worldfile generated from basename + .wld */
    else {
      fullPath = GDALGetDescription(hDS);
      fileExtension = msStrdup("wld");
1781 1782
    }

1783 1784
    if( fullPath )
      success = GDALReadWorldFile(fullPath, fileExtension, padfGeoTransform);
1785

1786 1787 1788 1789
    if( success && layer->debug >= MS_DEBUGLEVEL_VVV ) {
      msDebug("Worldfile location: %s.\n", fullPath);
    } else if( layer->debug >= MS_DEBUGLEVEL_VVV ) {
      msDebug("Failed using worldfile location: %s.\n", fullPath);
1790 1791
    }

1792
    msFree(fileExtension);
1793

1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810
    if( success )
      return MS_SUCCESS;
  }

  /* -------------------------------------------------------------------- */
  /*      Try GDAL.                                                       */
  /*                                                                      */
  /*      Make sure that ymax is always at the top, and ymin at the       */
  /*      bottom ... that is flip any files without the usual             */
  /*      orientation.  This is intended to enable display of "raw"       */
  /*      files with no coordinate system otherwise they break down in    */
  /*      many ways.                                                      */
  /* -------------------------------------------------------------------- */
  if (GDALGetGeoTransform( hDS, padfGeoTransform ) == CE_None ) {
    if( padfGeoTransform[5] == 1.0 && padfGeoTransform[3] == 0.0 ) {
      padfGeoTransform[5] = -1.0;
      padfGeoTransform[3] = GDALGetRasterYSize(hDS);
1811 1812
    }

1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860
    return MS_SUCCESS;
  }

  /* -------------------------------------------------------------------- */
  /*      Try worldfile.                                                  */
  /* -------------------------------------------------------------------- */
  if( GDALGetDescription(hDS) != NULL
      && GDALReadWorldFile(GDALGetDescription(hDS), "wld",
                           padfGeoTransform) ) {
    return MS_SUCCESS;
  }

  /* -------------------------------------------------------------------- */
  /*      Do we have the extent keyword on the layer?  We only use        */
  /*      this if we have a single raster associated with the layer as    */
  /*      opposed to a tile index.                                        */
  /*                                                                      */
  /*      Arguably this ought to take priority over all the other         */
  /*      stuff.                                                          */
  /* -------------------------------------------------------------------- */
  if (MS_VALID_EXTENT(layer->extent) && layer->data != NULL) {
    rect = layer->extent;

    padfGeoTransform[0] = rect.minx;
    padfGeoTransform[1] = (rect.maxx - rect.minx) /
                          (double) GDALGetRasterXSize( hDS );
    padfGeoTransform[2] = 0;
    padfGeoTransform[3] = rect.maxy;
    padfGeoTransform[4] = 0;
    padfGeoTransform[5] = (rect.miny - rect.maxy) /
                          (double) GDALGetRasterYSize( hDS );

    return MS_SUCCESS;
  }

  /* -------------------------------------------------------------------- */
  /*      We didn't find any info ... use the default.                    */
  /*      Reset our default geotransform.  GDALGetGeoTransform() may      */
  /*      have altered it even if GDALGetGeoTransform() failed.           */
  /* -------------------------------------------------------------------- */
  padfGeoTransform[0] = 0.0;
  padfGeoTransform[1] = 1.0;
  padfGeoTransform[2] = 0.0;
  padfGeoTransform[3] = GDALGetRasterYSize(hDS);
  padfGeoTransform[4] = 0.0;
  padfGeoTransform[5] = -1.0;

  return MS_FAILURE;
1861 1862 1863 1864 1865 1866 1867 1868
}

/************************************************************************/
/*                   msDrawRasterLayerGDAL_RawMode()                    */
/*                                                                      */
/*      Handle the loading and application of data in rawmode.          */
/************************************************************************/

1869
static int
1870
msDrawRasterLayerGDAL_RawMode(
1871 1872 1873
  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 )
1874 1875

{
1876 1877 1878 1879 1880 1881 1882 1883 1884
  void *pBuffer;
  GDALDataType eDataType;
  int *band_list, band_count;
  int  i, j, k, band;
  CPLErr eErr;
  float *f_nodatas = NULL;
  unsigned char *b_nodatas = NULL;
  GInt16 *i_nodatas = NULL;
  int got_nodata=FALSE;
1885 1886 1887 1888 1889 1890 1891 1892 1893
  rasterBufferObj *mask_rb = NULL;
  if(layer->mask) {
    int ret;
    layerObj *maskLayer = GET_LAYER(map, msGetLayerIndex(map,layer->mask));
    mask_rb = msSmallCalloc(1,sizeof(rasterBufferObj)); 
    ret = MS_IMAGE_RENDERER(maskLayer->maskimage)->getRasterBufferHandle(maskLayer->maskimage,mask_rb);
    if(ret != MS_SUCCESS)
      return -1;
  }
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910

  if( image->format->bands > 256 ) {
    msSetError( MS_IMGERR, "Too many bands (more than 256).",
                "msDrawRasterLayerGDAL_RawMode()" );
    return -1;
  }

  /* -------------------------------------------------------------------- */
  /*      What data type do we need?                                      */
  /* -------------------------------------------------------------------- */
  if( image->format->imagemode == MS_IMAGEMODE_INT16 )
    eDataType = GDT_Int16;
  else if( image->format->imagemode == MS_IMAGEMODE_FLOAT32 )
    eDataType = GDT_Float32;
  else if( image->format->imagemode == MS_IMAGEMODE_BYTE )
    eDataType = GDT_Byte;
  else
1911
    return -1;
1912

1913 1914 1915 1916 1917 1918 1919
  /* -------------------------------------------------------------------- */
  /*      Work out the band list.                                         */
  /* -------------------------------------------------------------------- */
  band_list = msGetGDALBandList( layer, hDS, image->format->bands,
                                 &band_count );
  if( band_list == NULL )
    return -1;
1920

1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
  if( band_count != image->format->bands ) {
    free( band_list );
    msSetError( MS_IMGERR, "BANDS PROCESSING directive has wrong number of bands, expected %d, got %d.",
                "msDrawRasterLayerGDAL_RawMode()",
                image->format->bands, band_count );
    return -1;
  }

  /* -------------------------------------------------------------------- */
  /*      Do we have nodata values?                                       */
  /* -------------------------------------------------------------------- */
  f_nodatas = (float *) calloc(sizeof(float),band_count);
  if (f_nodatas == NULL) {
    msSetError(MS_MEMERR, "%s: %d: Out of memory allocating %u bytes.\n", "msDrawRasterLayerGDAL_RawMode()",
1935
               __FILE__, __LINE__, (unsigned int)(sizeof(float)*band_count));
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
    free( band_list );
    return -1;
  }

  if( band_count <= 3
      && (layer->offsite.red != -1
          || layer->offsite.green != -1
          || layer->offsite.blue != -1) ) {
    if( band_count > 0 )
      f_nodatas[0] = layer->offsite.red;
    if( band_count > 1 )
      f_nodatas[1] = layer->offsite.green;
    if( band_count > 2 )
      f_nodatas[2] = layer->offsite.blue;
    got_nodata = TRUE;
  }

  if( !got_nodata ) {
    got_nodata = TRUE;
    for( band = 0; band < band_count && got_nodata; band++ ) {
      f_nodatas[band] = msGetGDALNoDataValue(
                          layer, GDALGetRasterBand(hDS,band_list[band]), &got_nodata );
    }
  }

  if( !got_nodata ) {