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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 <stdbool.h>
#include "mapserver.h"
#include "mapresample.h"
#include "mapthread.h"
#include "maptime.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))
#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))
#include "gdal.h"
#include "cpl_string.h"
#include "gdal_alg.h"
static bool
IsNoData( double dfValue, double dfNoDataValue );
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,
bool *pbScaled, double *pdfScaleMin, double *pdfScaleRatio,
bool **ppbIsNoDataBuffer );
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,
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 );
/*
* rasterBufferObj setting macros.
*/
/************************************************************************/
/* msDrawRasterLayerGDAL() */
/************************************************************************/
int msDrawRasterLayerGDAL(mapObj *map, layerObj *layer, imageObj *image,
rasterBufferObj *rb, void *hDSVoid )
{
int i; /* 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=NULL;
GDALRasterBandH hBand1=NULL, hBand2=NULL, hBand3=NULL, hBandAlpha=NULL;
int bHaveRGBNoData = FALSE;
int nNoData1=-1,nNoData2=-1,nNoData3=-1;
rasterBufferObj *mask_rb = NULL;
rasterBufferObj s_mask_rb;
if(layer->mask) {
int ret;
layerObj *maskLayer = GET_LAYER(map, msGetLayerIndex(map,layer->mask));
mask_rb = &s_mask_rb;
memset(mask_rb, 0, sizeof(s_mask_rb));
ret = MS_IMAGE_RENDERER(maskLayer->maskimage)->getRasterBufferHandle(maskLayer->maskimage,mask_rb);
if(ret != MS_SUCCESS)
return -1;
}
/*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 = MS_MAX(0,(int) floor(llx+0.5));
src_yoff = MS_MAX(0,(int) floor(ury+0.5));
src_xsize = MS_MIN(MS_MAX(0,(int) (urx - llx + 0.5)),
GDALGetRasterXSize(hDS) - src_xoff);
src_ysize = MS_MIN(MS_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 = MS_MIN(src_xoff,GDALGetRasterXSize(hDS)-1);
}
if( src_ysize == 0 && (lly - ury) > 0.0 ) {
src_ysize = 1;
src_yoff = MS_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 = MS_MAX(0,MS_MIN(image->width,dst_lrx));
dst_lry = MS_MAX(0,MS_MIN(image->height,dst_lry));
dst_xsize = MS_MAX(0,MS_MIN(image->width,dst_lrx - dst_xoff));
dst_ysize = MS_MAX(0,MS_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 = MS_MIN(image->width,src_xsize);
dst_ysize = src_ysize = MS_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 grey=1, grey=1,alpha=2,
* red=1,green=2,blue=3 or red=1,green=2,blue=3,alpha>=4.
*/
if( CSLFetchNameValue( layer->processing, "BANDS" ) == NULL ) {
const int gdal_band_count = GDALGetRasterCount( hDS );
red_band = 1;
if( gdal_band_count >= 4 )
{
/* The alpha band is not necessarily the 4th one */
for( i = 4; i <= gdal_band_count; i ++ ) {
if( GDALGetRasterColorInterpretation(
GDALGetRasterBand( hDS, i ) ) == GCI_AlphaBand ) {
alpha_band = i;
break;
}
}
}
if( gdal_band_count >= 3 ) {
green_band = 2;
blue_band = 3;
}
if( gdal_band_count == 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 );
/*
* 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, 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.
*/
bool isDefaultGreyscale = false;
if( hBand2 != NULL )
hColorMap = NULL;
else {
hColorMap = GDALGetRasterColorTable( hBand1 );
if( hColorMap != NULL )
hColorMap = GDALCloneColorTable( hColorMap );
else {
hColorMap = GDALCreateColorTable( GPI_RGB );
isDefaultGreyscale = true;
for( i = 0; i < 256; i++ ) {
colorObj pixel;
GDALColorEntry sEntry;
pixel.red = i;
pixel.green = i;
pixel.blue = i;
if(MS_COMPARE_COLORS(pixel, layer->offsite)) {
sEntry.c1 = 0;
sEntry.c2 = 0;
sEntry.c3 = 0;
sEntry.c4 = 0; /* alpha set to zero */
} else {
sEntry.c1 = i;
sEntry.c2 = i;
sEntry.c3 = i;
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 );
}
}
}
/*
* 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.
*/
bool bScaled = false;
double dfScaleMin = 0;
double dfScaleRatio = 0;
bool* pbIsNoDataBuffer = NULL;
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,
&bScaled, &dfScaleMin, &dfScaleRatio,
&pbIsNoDataBuffer ) == -1 ) {
free( pabyRaw1 );
free( pbIsNoDataBuffer );
return -1;
}
/*
* 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;
const char* pszRangeColorspace = msLayerGetProcessingKey( layer, "RANGE_COLORSPACE" );
colorspace iRangeColorspace;
#ifndef NDEBUG
cmap_set = TRUE;
#endif
if( hColorMap == NULL ) {
msSetError(MS_IOERR,
"Attempt to classify 24bit image, this is unsupported.",
"drawGDAL()");
free( pabyRaw1 );
free( pbIsNoDataBuffer );
return -1;
}
if(!pszRangeColorspace || !strcasecmp(pszRangeColorspace, "RGB")) {
iRangeColorspace = MS_COLORSPACE_RGB;
} else if(!strcasecmp(pszRangeColorspace, "HSL")) {
iRangeColorspace = MS_COLORSPACE_HSL;
} else {
msSetError(MS_MISCERR,
"Unknown RANGE_COLORSPACE \"%s\", expecting RGB or HSL",
"drawGDAL()", pszRangeColorspace);
GDALDestroyColorTable( hColorMap );
free( pabyRaw1 );
free( pbIsNoDataBuffer );
return -1;
}
int color_count = GDALGetColorEntryCount(hColorMap);
const bool bScaleColors = bScaled && !isDefaultGreyscale;
if( !bScaleColors && color_count > 256 )
color_count = 256;
for(i=0; i < color_count; i++) {
colorObj pixel;
int colormap_index;
GDALColorEntry sEntry;
GDALGetColorEntryAsRGB( hColorMap, i, &sEntry );
const int j = bScaleColors ? MAX(0, MIN(255, (int) ((i-dfScaleMin)*dfScaleRatio))) : i;
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) { /* belongs to any class */
int s;
/* change colour based on colour range? Currently we
only address the greyscale case properly. */
if( MS_VALID_COLOR(layer->class[c]->styles[0]->mincolor) ) {
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)) {
if( sEntry.c1 >= layer->class[c]->styles[s]->minvalue
&& sEntry.c1 <= layer->class[c]->styles[s]->maxvalue ) {
msValueToRange(layer->class[c]->styles[s], sEntry.c1, iRangeColorspace);
if(MS_VALID_COLOR(layer->class[c]->styles[s]->color)) {
rb_cmap[0][j] = layer->class[c]->styles[s]->color.red;
rb_cmap[1][j] = layer->class[c]->styles[s]->color.green;
rb_cmap[2][j] = layer->class[c]->styles[s]->color.blue;
rb_cmap[3][j] = (layer->class[c]->styles[s]->color.alpha != 255)?(layer->class[c]->styles[s]->color.alpha):(255*layer->class[c]->styles[0]->opacity / 100);
break;
}
}
}
}
}
else 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][j] = layer->class[c]->styles[0]->color.red;
rb_cmap[1][j] = layer->class[c]->styles[0]->color.green;
rb_cmap[2][j] = layer->class[c]->styles[0]->color.blue;
rb_cmap[3][j] = (255*layer->class[c]->styles[0]->opacity / 100);
}
else { /* Use raster color */
rb_cmap[0][j] = pixel.red;
rb_cmap[1][j] = pixel.green;
rb_cmap[2][j] = pixel.blue;
rb_cmap[3][j] = 255;
}
}
}
}
} else if( hBand2 == NULL && hColorMap != NULL && rb->type == MS_BUFFER_BYTE_RGBA ) {
int color_count;
#ifndef NDEBUG
cmap_set = TRUE;
#endif
color_count = MS_MIN(256,GDALGetColorEntryCount(hColorMap));
const bool bScaleColors = bScaled && !isDefaultGreyscale;
if( !bScaleColors && color_count > 256 )
color_count = 256;
for(i=0; i < color_count; i++) {
GDALColorEntry sEntry;
GDALGetColorEntryAsRGB( hColorMap, i, &sEntry );
const int j = bScaleColors ? MAX(0, MIN(255, (int) ((i-dfScaleMin)*dfScaleRatio))) : i;
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][j] = sEntry.c1;
rb_cmap[1][j] = sEntry.c2;
rb_cmap[2][j] = sEntry.c3;
rb_cmap[3][j] = sEntry.c4;
}
}
}
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( CSLTestBoolean(CSLFetchNameValueDef( layer->processing, "USE_MASK_BAND", "YES" )) &&
(nMaskFlags & GMF_PER_DATASET) != 0 &&
(nMaskFlags & (GMF_NODATA|GMF_ALL_VALID)) == 0 ) {
CPLErr eErr;
unsigned char * pabyOrig = pabyRaw1;
if( layer->debug )
msDebug( "msDrawGDAL(): using GDAL mask band for alpha.\n" );
band_count++;
pabyRaw1 = (unsigned char *)
realloc(pabyOrig,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 );
free(pabyOrig);
if( hColorMap != NULL )
GDALDestroyColorTable( hColorMap );
free( pbIsNoDataBuffer );
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() );
if( hColorMap != NULL )
GDALDestroyColorTable( hColorMap );
free( pabyRaw1 );
free( pbIsNoDataBuffer );
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;
}
}
}
/* -------------------------------------------------------------------- */
/* Single band plus colormap and alpha to truecolor. (RB) */
/* -------------------------------------------------------------------- */
if( hBand2 == NULL && rb->type == MS_BUFFER_BYTE_RGBA && hBandAlpha != NULL ) {
assert( cmap_set );
int k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
for( int j = dst_xoff; j < dst_xoff + dst_xsize; j++, k++ ) {
int src_pixel, src_alpha, cmap_alpha, merged_alpha;
if(SKIP_MASK(j,i) || (pbIsNoDataBuffer && pbIsNoDataBuffer[k]))
continue;
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 );
}
}
}
}
/* -------------------------------------------------------------------- */
/* Single band plus colormap (no alpha) to truecolor (RB) */
/* -------------------------------------------------------------------- */
else if( hBand2 == NULL && rb->type == MS_BUFFER_BYTE_RGBA ) {
assert( cmap_set );
int k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
for( int j = dst_xoff; j < dst_xoff + dst_xsize; j++, k++ ) {
int src_pixel = pabyRaw1[k];
if(SKIP_MASK(j,i) || (pbIsNoDataBuffer && pbIsNoDataBuffer[k]))
continue;
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 ) {
int k = 0;
for( i = dst_yoff; i < dst_yoff + dst_ysize; i++ ) {
for( int j = dst_xoff; j < dst_xoff + dst_xsize; j++, k++ ) {
if(SKIP_MASK(j,i) || (pbIsNoDataBuffer && pbIsNoDataBuffer[k]))
continue;
if( MS_VALID_COLOR( layer->offsite )
&& pabyRaw1[k] == layer->offsite.red
&& pabyRaw2[k] == layer->offsite.green
&& pabyRaw3[k] == layer->offsite.blue )
continue;
if( bHaveRGBNoData
&& pabyRaw1[k] == nNoData1
&& pabyRaw2[k] == nNoData2
&& pabyRaw3[k] == nNoData3 )
continue;
if( pabyRawAlpha == NULL || pabyRawAlpha[k] == 255 ) {
RB_SET_PIXEL( rb, j, i,
pabyRaw1[k],
pabyRaw2[k],
pabyRaw3[k],
255 );
} else if( pabyRawAlpha[k] != 0 ) {
RB_MIX_PIXEL( rb, j, i,
pabyRaw1[k],
pabyRaw2[k],
pabyRaw3[k],
pabyRawAlpha[k] );
}
}
}
}
/*
** Cleanup
*/
free( pabyRaw1 );
free( pbIsNoDataBuffer );
if( hColorMap != NULL )
GDALDestroyColorTable( hColorMap );
return 0;
}
/************************************************************************/
/* ParseDefaultLUT() */
/************************************************************************/
static int ParseDefaultLUT( const char *lut_def, GByte *lut, int nMaxValIn )
{
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, assume nMaxValIn:255 */
if( *lut_read == '\0' ) {
all_done = TRUE;
if ( last_in != nMaxValIn ) {
this_in = nMaxValIn;
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 = MS_MAX(0,MS_MIN(nMaxValIn,this_in));
this_out = MS_MAX(0,MS_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;
}
/************************************************************************/
/* LutFromGimpLine() */
/************************************************************************/
static int LutFromGimpLine( char *lut_line, GByte *lut )
{
char wrkLUTDef[1000];
int i, count = 0;
char **tokens;
/* 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';
while( *lut_line == 10 || *lut_line == 13 )
lut_line++;
/* tokenize line */
tokens = CSLTokenizeString( lut_line );
if( CSLCount(tokens) != 17 * 2 ) {
CSLDestroy( tokens );
msSetError(MS_MISCERR,
"GIMP curve file appears corrupt.",
"LutFromGimpLine()" );
return -1;
}
/* 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] );
}
}