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mapdrawgdal.c
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mapdrawgdal.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Code for drawing GDAL raster layers. Called from
* msDrawRasterLayerLow() in mapraster.c.
* 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:
*
* 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], cmap_set = FALSE;
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;
cmap_set = TRUE;
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;
cmap_set = TRUE;
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;
cmap_set = TRUE;
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++ )