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mapdraw.c
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mapdraw.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: High level msDrawMap() implementation and related functions.
* Author: Steve Lime and the MapServer team.
*
******************************************************************************
* 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 <math.h>
#include "mapserver.h"
#include "maptime.h"
#include "mapcopy.h"
#ifdef USE_GD
/*
* Functions to reset any pen (color index) values previously set. Used primarily to reset things when
* using MapScript to create multiple images. How the pen values are set is irrelevant (definitely output
* format type specific) which is why this function is here instead of the GD, PDF or SWF source files.
*/
void msClearLayerPenValues(layerObj *layer)
{
int i, j, k;
for(i=0; i<layer->numclasses; i++) {
for(j=0; j<layer->class[i]->numlabels; j++) {
layer->class[i]->labels[j]->color.pen = MS_PEN_UNSET; /* set in MSXXDrawText function */
layer->class[i]->labels[j]->outlinecolor.pen = MS_PEN_UNSET;
layer->class[i]->labels[j]->shadowcolor.pen = MS_PEN_UNSET;
for(k=0; k<layer->class[i]->labels[j]->numstyles; k++) {
layer->class[i]->labels[j]->styles[k]->backgroundcolor.pen = MS_PEN_UNSET; /* set in various symbol drawing functions */
layer->class[i]->labels[j]->styles[k]->color.pen = MS_PEN_UNSET;
layer->class[i]->labels[j]->styles[k]->outlinecolor.pen = MS_PEN_UNSET;
}
}
for(j=0; j<layer->class[i]->numstyles; j++) {
layer->class[i]->styles[j]->backgroundcolor.pen = MS_PEN_UNSET; /* set in various symbol drawing functions */
layer->class[i]->styles[j]->color.pen = MS_PEN_UNSET;
layer->class[i]->styles[j]->outlinecolor.pen = MS_PEN_UNSET;
}
}
}
void msClearScalebarPenValues(scalebarObj *scalebar)
{
if (scalebar) {
scalebar->color.pen = MS_PEN_UNSET;
scalebar->backgroundcolor.pen = MS_PEN_UNSET;
scalebar->outlinecolor.pen = MS_PEN_UNSET;
scalebar->imagecolor.pen = MS_PEN_UNSET;
scalebar->label.color.pen = MS_PEN_UNSET;
scalebar->label.outlinecolor.pen = MS_PEN_UNSET;
scalebar->label.shadowcolor.pen = MS_PEN_UNSET;
/* TODO: deal with label styles here */
}
}
void msClearLegendPenValues(legendObj *legend)
{
if (legend) {
legend->outlinecolor.pen = MS_PEN_UNSET;
legend->imagecolor.pen = MS_PEN_UNSET;
legend->label.color.pen = MS_PEN_UNSET;
legend->label.outlinecolor.pen = MS_PEN_UNSET;
legend->label.shadowcolor.pen = MS_PEN_UNSET;
/* TODO: deal with label styles here */
}
}
void msClearReferenceMapPenValues(referenceMapObj *referencemap)
{
if (referencemap) {
referencemap->outlinecolor.pen = MS_PEN_UNSET;
referencemap->color.pen = MS_PEN_UNSET;
}
}
void msClearQueryMapPenValues(queryMapObj *querymap)
{
if (querymap)
querymap->color.pen = MS_PEN_UNSET;
}
void msClearPenValues(mapObj *map)
{
int i;
for(i=0; i<map->numlayers; i++)
msClearLayerPenValues((GET_LAYER(map, i)));
msClearLegendPenValues(&(map->legend));
msClearScalebarPenValues(&(map->scalebar));
msClearReferenceMapPenValues(&(map->reference));
msClearQueryMapPenValues(&(map->querymap));
}
#endif
/* msPrepareImage()
*
* Returns a new imageObj ready for rendering the current map.
*
* If allow_nonsquare is set to MS_TRUE then the caller should call
* msMapRestoreRealExtent() once they are done with the image.
* This should be set to MS_TRUE only when called from msDrawMap(), see bug 945.
*/
imageObj *msPrepareImage(mapObj *map, int allow_nonsquare)
{
int i, status;
imageObj *image=NULL;
double geo_cellsize;
if(map->width == -1 || map->height == -1) {
msSetError(MS_MISCERR, "Image dimensions not specified.", "msPrepareImage()");
return(NULL);
}
msInitLabelCache(&(map->labelcache)); /* this clears any previously allocated cache */
/* clear any previously created mask layer images */
for(i=0; i<map->numlayers; i++) {
if(GET_LAYER(map, i)->maskimage) {
msFreeImage(GET_LAYER(map, i)->maskimage);
GET_LAYER(map, i)->maskimage = NULL;
}
}
status = msValidateContexts(map); /* make sure there are no recursive REQUIRES or LABELREQUIRES expressions */
if(status != MS_SUCCESS) return NULL;
if(!map->outputformat) {
msSetError(MS_GDERR, "Map outputformat not set!", "msPrepareImage()");
return(NULL);
} else if (MS_RENDERER_PLUGIN(map->outputformat)) {
rendererVTableObj *renderer = map->outputformat->vtable;
colorObj *bg = &map->imagecolor;
map->imagecolor.alpha=255;
if(map->transparent == MS_TRUE) {
/* don't set the image color */
bg = NULL;
}
image = renderer->createImage(map->width, map->height, map->outputformat,bg);
if (image == NULL)
return(NULL);
image->format = map->outputformat;
image->format->refcount++;
image->width = map->width;
image->height = map->height;
image->resolution = map->resolution;
image->resolutionfactor = map->resolution/map->defresolution;
if (map->web.imagepath)
image->imagepath = msStrdup(map->web.imagepath);
if (map->web.imageurl)
image->imageurl = msStrdup(map->web.imageurl);
} else if( MS_RENDERER_IMAGEMAP(map->outputformat) ) {
image = msImageCreateIM(map->width, map->height, map->outputformat,
map->web.imagepath, map->web.imageurl, map->resolution, map->defresolution);
} else if( MS_RENDERER_RAWDATA(map->outputformat) ) {
image = msImageCreate(map->width, map->height, map->outputformat,
map->web.imagepath, map->web.imageurl, map->resolution, map->defresolution, &map->imagecolor);
} else {
image = NULL;
}
if(!image) {
msSetError(MS_GDERR, "Unable to initialize image.", "msPrepareImage()");
return(NULL);
}
/*
* If we want to support nonsquare pixels, note that now, otherwise
* adjust the extent size to have square pixels.
*
* If allow_nonsquare is set to MS_TRUE then the caller should call
* msMapRestoreRealExtent() once they are done with the image.
* This should be set to MS_TRUE only when called from msDrawMap(), see bug 945.
*/
if( allow_nonsquare && msTestConfigOption( map, "MS_NONSQUARE", MS_FALSE ) ) {
double cellsize_x = (map->extent.maxx - map->extent.minx)/map->width;
double cellsize_y = (map->extent.maxy - map->extent.miny)/map->height;
if( cellsize_y != 0.0
&& (fabs(cellsize_x/cellsize_y) > 1.00001
|| fabs(cellsize_x/cellsize_y) < 0.99999) ) {
map->gt.need_geotransform = MS_TRUE;
if (map->debug)
msDebug( "msDrawMap(): kicking into non-square pixel preserving mode.\n" );
}
map->cellsize = (cellsize_x*0.5 + cellsize_y*0.5);
} else
map->cellsize = msAdjustExtent(&(map->extent),map->width,map->height);
status = msCalculateScale(map->extent,map->units,map->width,map->height, map->resolution, &map->scaledenom);
if(status != MS_SUCCESS) {
msFreeImage(image);
return(NULL);
}
/* update geotransform based on adjusted extent. */
msMapComputeGeotransform( map );
/* Do we need to fake out stuff for rotated support? */
if( map->gt.need_geotransform )
msMapSetFakedExtent( map );
/* We will need a cellsize that represents a real georeferenced */
/* coordinate cellsize here, so compute it from saved extents. */
geo_cellsize = map->cellsize;
if( map->gt.need_geotransform == MS_TRUE ) {
double cellsize_x = (map->saved_extent.maxx - map->saved_extent.minx)
/ map->width;
double cellsize_y = (map->saved_extent.maxy - map->saved_extent.miny)
/ map->height;
geo_cellsize = sqrt(cellsize_x*cellsize_x + cellsize_y*cellsize_y)
/ sqrt(2.0);
}
/* compute layer scale factors now */
for(i=0; i<map->numlayers; i++) {
if(GET_LAYER(map, i)->sizeunits != MS_PIXELS)
GET_LAYER(map, i)->scalefactor = (msInchesPerUnit(GET_LAYER(map, i)->sizeunits,0)/msInchesPerUnit(map->units,0)) / geo_cellsize;
else if(GET_LAYER(map, i)->symbolscaledenom > 0 && map->scaledenom > 0)
GET_LAYER(map, i)->scalefactor = GET_LAYER(map, i)->symbolscaledenom/map->scaledenom*map->resolution/map->defresolution;
else
GET_LAYER(map, i)->scalefactor = map->resolution/map->defresolution;
}
image->refpt.x = MS_MAP2IMAGE_X_IC_DBL(0, map->extent.minx, 1.0/map->cellsize);
image->refpt.y = MS_MAP2IMAGE_Y_IC_DBL(0, map->extent.maxy, 1.0/map->cellsize);
return image;
}
/*
* Generic function to render the map file.
* The type of the image created is based on the imagetype parameter in the map file.
*
* mapObj *map - map object loaded in MapScript or via a mapfile to use
* int querymap - is this map the result of a query operation, MS_TRUE|MS_FALSE
*/
imageObj *msDrawMap(mapObj *map, int querymap)
{
int i;
layerObj *lp=NULL;
int status = MS_FAILURE;
imageObj *image = NULL;
struct mstimeval mapstarttime, mapendtime;
struct mstimeval starttime, endtime;
#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
enum MS_CONNECTION_TYPE lastconnectiontype;
httpRequestObj *pasOWSReqInfo=NULL;
int numOWSLayers=0, numOWSRequests=0;
wmsParamsObj sLastWMSParams;
#endif
if(map->debug >= MS_DEBUGLEVEL_TUNING) msGettimeofday(&mapstarttime, NULL);
if(querymap) { /* use queryMapObj image dimensions */
if(map->querymap.width != -1) map->width = map->querymap.width;
if(map->querymap.height != -1) map->height = map->querymap.height;
}
msApplyMapConfigOptions(map);
image = msPrepareImage(map, MS_TRUE);
if(!image) {
msSetError(MS_IMGERR, "Unable to initialize image.", "msDrawMap()");
return(NULL);
}
if( map->debug >= MS_DEBUGLEVEL_DEBUG )
msDebug( "msDrawMap(): rendering using outputformat named %s (%s).\n",
map->outputformat->name,
map->outputformat->driver );
#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
/* Time the OWS query phase */
if(map->debug >= MS_DEBUGLEVEL_TUNING ) msGettimeofday(&starttime, NULL);
/* How many OWS (WMS/WFS) layers do we have to draw?
* Note: numOWSLayers is the number of actual layers and numOWSRequests is
* the number of HTTP requests which could be lower if multiple layers
* are merged into the same request.
*/
numOWSLayers=0;
for(i=0; i<map->numlayers; i++) {
if(map->layerorder[i] != -1 &&
msLayerIsVisible(map, GET_LAYER(map,map->layerorder[i])))
numOWSLayers++;
}
if (numOWSLayers > 0) {
/* Alloc and init pasOWSReqInfo...
*/
pasOWSReqInfo = (httpRequestObj *)malloc((numOWSLayers+1)*sizeof(httpRequestObj));
if (pasOWSReqInfo == NULL) {
msSetError(MS_MEMERR, "Allocation of httpRequestObj failed.", "msDrawMap()");
return NULL;
}
msHTTPInitRequestObj(pasOWSReqInfo, numOWSLayers+1);
msInitWmsParamsObj(&sLastWMSParams);
/* Pre-download all WMS/WFS layers in parallel before starting to draw map */
lastconnectiontype = MS_SHAPEFILE;
for(i=0; numOWSLayers && i<map->numlayers; i++) {
if(map->layerorder[i] == -1 || !msLayerIsVisible(map, GET_LAYER(map,map->layerorder[i])))
continue;
lp = GET_LAYER(map,map->layerorder[i]);
#ifdef USE_WMS_LYR
if(lp->connectiontype == MS_WMS) {
if(msPrepareWMSLayerRequest(map->layerorder[i], map, lp, 1, lastconnectiontype, &sLastWMSParams, 0, 0, 0, NULL, pasOWSReqInfo, &numOWSRequests) == MS_FAILURE) {
msFreeWmsParamsObj(&sLastWMSParams);
msFreeImage(image);
msFree(pasOWSReqInfo);
return NULL;
}
}
#endif
#ifdef USE_WFS_LYR
if(lp->connectiontype == MS_WFS) {
if(msPrepareWFSLayerRequest(map->layerorder[i], map, lp, pasOWSReqInfo, &numOWSRequests) == MS_FAILURE) {
msFreeWmsParamsObj(&sLastWMSParams);
msFreeImage(image);
msFree(pasOWSReqInfo);
return NULL;
}
}
#endif
lastconnectiontype = lp->connectiontype;
}
#ifdef USE_WMS_LYR
msFreeWmsParamsObj(&sLastWMSParams);
#endif
} /* if numOWSLayers > 0 */
if(numOWSRequests && msOWSExecuteRequests(pasOWSReqInfo, numOWSRequests, map, MS_TRUE) == MS_FAILURE) {
msFreeImage(image);
msFree(pasOWSReqInfo);
return NULL;
}
if(map->debug >= MS_DEBUGLEVEL_TUNING) {
msGettimeofday(&endtime, NULL);
msDebug("msDrawMap(): WMS/WFS set-up and query, %.3fs\n",
(endtime.tv_sec+endtime.tv_usec/1.0e6)-
(starttime.tv_sec+starttime.tv_usec/1.0e6) );
}
#endif /* USE_WMS_LYR || USE_WFS_LYR */
/* OK, now we can start drawing */
for(i=0; i<map->numlayers; i++) {
if(map->layerorder[i] != -1) {
lp = (GET_LAYER(map, map->layerorder[i]));
if(lp->postlabelcache) /* wait to draw */
continue;
if(map->debug >= MS_DEBUGLEVEL_TUNING || lp->debug >= MS_DEBUGLEVEL_TUNING ) msGettimeofday(&starttime, NULL);
if(!msLayerIsVisible(map, lp)) continue;
if(lp->connectiontype == MS_WMS) {
#ifdef USE_WMS_LYR
if(MS_RENDERER_PLUGIN(image->format) || MS_RENDERER_RAWDATA(image->format))
status = msDrawWMSLayerLow(map->layerorder[i], pasOWSReqInfo, numOWSRequests, map, lp, image);
else {
msSetError(MS_WMSCONNERR, "Output format '%s' doesn't support WMS layers.", "msDrawMap()", image->format->name);
status = MS_FAILURE;
}
if(status == MS_FAILURE) {
msSetError(MS_WMSCONNERR,
"Failed to draw WMS layer named '%s'. This most likely happened because "
"the remote WMS server returned an invalid image, and XML exception "
"or another unexpected result in response to the GetMap request. Also check "
"and make sure that the layer's connection URL is valid.",
"msDrawMap()", lp->name);
msFreeImage(image);
msHTTPFreeRequestObj(pasOWSReqInfo, numOWSRequests);
msFree(pasOWSReqInfo);
return(NULL);
}
#else /* ndef USE_WMS_LYR */
msSetError(MS_WMSCONNERR, "MapServer not built with WMS Client support, unable to render layer '%s'.", "msDrawMap()", lp->name);
msFreeImage(image);
return(NULL);
#endif
} else { /* Default case: anything but WMS layers */
if(querymap)
status = msDrawQueryLayer(map, lp, image);
else
status = msDrawLayer(map, lp, image);
if(status == MS_FAILURE) {
msSetError(MS_IMGERR, "Failed to draw layer named '%s'.", "msDrawMap()", lp->name);
msFreeImage(image);
#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
if (pasOWSReqInfo) {
msHTTPFreeRequestObj(pasOWSReqInfo, numOWSRequests);
msFree(pasOWSReqInfo);
}
#endif /* USE_WMS_LYR || USE_WFS_LYR */
return(NULL);
}
}
}
if(map->debug >= MS_DEBUGLEVEL_TUNING || lp->debug >= MS_DEBUGLEVEL_TUNING) {
msGettimeofday(&endtime, NULL);
msDebug("msDrawMap(): Layer %d (%s), %.3fs\n",
map->layerorder[i], lp->name?lp->name:"(null)",
(endtime.tv_sec+endtime.tv_usec/1.0e6)-
(starttime.tv_sec+starttime.tv_usec/1.0e6) );
}
}
if(map->scalebar.status == MS_EMBED && !map->scalebar.postlabelcache) {
/* We need to temporarily restore the original extent for drawing */
/* the scalebar as it uses the extent to recompute cellsize. */
if(map->gt.need_geotransform)
msMapRestoreRealExtent(map);
if(MS_SUCCESS != msEmbedScalebar(map, image)) {
msFreeImage( image );
return NULL;
}
if(map->gt.need_geotransform)
msMapSetFakedExtent(map);
}
if(map->legend.status == MS_EMBED && !map->legend.postlabelcache) {
if( msEmbedLegend(map, image) != MS_SUCCESS ) {
msFreeImage( image );
return NULL;
}
}
if(map->debug >= MS_DEBUGLEVEL_TUNING) msGettimeofday(&starttime, NULL);
if(msDrawLabelCache(image, map) != MS_SUCCESS) {
msFreeImage(image);
#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
if (pasOWSReqInfo) {
msHTTPFreeRequestObj(pasOWSReqInfo, numOWSRequests);
msFree(pasOWSReqInfo);
}
#endif /* USE_WMS_LYR || USE_WFS_LYR */
return(NULL);
}
if(map->debug >= MS_DEBUGLEVEL_TUNING) {
msGettimeofday(&endtime, NULL);
msDebug("msDrawMap(): Drawing Label Cache, %.3fs\n",
(endtime.tv_sec+endtime.tv_usec/1.0e6)-
(starttime.tv_sec+starttime.tv_usec/1.0e6) );
}
for(i=0; i<map->numlayers; i++) { /* for each layer, check for postlabelcache layers */
lp = (GET_LAYER(map, map->layerorder[i]));
if(!lp->postlabelcache) continue;
if(!msLayerIsVisible(map, lp)) continue;
if(map->debug >= MS_DEBUGLEVEL_TUNING || lp->debug >= MS_DEBUGLEVEL_TUNING) msGettimeofday(&starttime, NULL);
if(lp->connectiontype == MS_WMS) {
#ifdef USE_WMS_LYR
if(MS_RENDERER_PLUGIN(image->format) || MS_RENDERER_RAWDATA(image->format))
status = msDrawWMSLayerLow(map->layerorder[i], pasOWSReqInfo, numOWSRequests, map, lp, image);
#else
status = MS_FAILURE;
#endif
} else {
if(querymap)
status = msDrawQueryLayer(map, lp, image);
else
status = msDrawLayer(map, lp, image);
}
if(status == MS_FAILURE) {
msFreeImage(image);
#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
if (pasOWSReqInfo) {
msHTTPFreeRequestObj(pasOWSReqInfo, numOWSRequests);
msFree(pasOWSReqInfo);
}
#endif /* USE_WMS_LYR || USE_WFS_LYR */
return(NULL);
}
if(map->debug >= MS_DEBUGLEVEL_TUNING || lp->debug >= MS_DEBUGLEVEL_TUNING) {
msGettimeofday(&endtime, NULL);
msDebug("msDrawMap(): Layer %d (%s), %.3fs\n",
map->layerorder[i], lp->name?lp->name:"(null)",
(endtime.tv_sec+endtime.tv_usec/1.0e6)-
(starttime.tv_sec+starttime.tv_usec/1.0e6) );
}
}
/* Do we need to fake out stuff for rotated support? */
/* This really needs to be done on every preceeding exit point too... */
if(map->gt.need_geotransform)
msMapRestoreRealExtent(map);
if(map->legend.status == MS_EMBED && map->legend.postlabelcache)
msEmbedLegend(map, image); /* TODO */
if(map->scalebar.status == MS_EMBED && map->scalebar.postlabelcache) {
/* We need to temporarily restore the original extent for drawing */
/* the scalebar as it uses the extent to recompute cellsize. */
if(map->gt.need_geotransform)
msMapRestoreRealExtent(map);
if(MS_SUCCESS != msEmbedScalebar(map, image)) {
msFreeImage( image );
return NULL;
}
if(map->gt.need_geotransform)
msMapSetFakedExtent(map);
}
#if defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
/* Cleanup WMS/WFS Request stuff */
if (pasOWSReqInfo) {
msHTTPFreeRequestObj(pasOWSReqInfo, numOWSRequests);
msFree(pasOWSReqInfo);
}
#endif
if(map->debug >= MS_DEBUGLEVEL_TUNING) {
msGettimeofday(&mapendtime, NULL);
msDebug("msDrawMap() total time: %.3fs\n",
(mapendtime.tv_sec+mapendtime.tv_usec/1.0e6)-
(mapstarttime.tv_sec+mapstarttime.tv_usec/1.0e6) );
}
return(image);
}
/*
* Test whether a layer should be drawn or not in the current map view and
* at the current scale.
* Returns TRUE if layer is visible, FALSE if not.
*/
int msLayerIsVisible(mapObj *map, layerObj *layer)
{
int i;
if(!layer->data && !layer->tileindex && !layer->connection && !layer->features && !layer->layerinfo)
return(MS_FALSE); /* no data associated with this layer, not an error since layer may be used as a template from MapScript */
if(layer->type == MS_LAYER_QUERY || layer->type == MS_LAYER_TILEINDEX) return(MS_FALSE);
if((layer->status != MS_ON) && (layer->status != MS_DEFAULT)) return(MS_FALSE);
/* Only return MS_FALSE if it is definitely false. Sometimes it will return MS_UNKNOWN, which we
** consider true, for this use case (it might be visible, try and draw it, see what happens). */
if ( msExtentsOverlap(map, layer) == MS_FALSE ) {
if( layer->debug >= MS_DEBUGLEVEL_V ) {
msDebug("msLayerIsVisible(): Skipping layer (%s) because LAYER.EXTENT does not intersect MAP.EXTENT\n", layer->name);
}
return(MS_FALSE);
}
if(msEvalContext(map, layer, layer->requires) == MS_FALSE) return(MS_FALSE);
if(map->scaledenom > 0) {
/* layer scale boundaries should be checked first */
if((layer->maxscaledenom > 0) && (map->scaledenom > layer->maxscaledenom)) {
if( layer->debug >= MS_DEBUGLEVEL_V ) {
msDebug("msLayerIsVisible(): Skipping layer (%s) because LAYER.MAXSCALE is too small for this MAP scale\n", layer->name);
}
return(MS_FALSE);
}
if((layer->minscaledenom > 0) && (map->scaledenom <= layer->minscaledenom)) {
if( layer->debug >= MS_DEBUGLEVEL_V ) {
msDebug("msLayerIsVisible(): Skipping layer (%s) because LAYER.MINSCALE is too large for this MAP scale\n", layer->name);
}
return(MS_FALSE);
}
/* now check class scale boundaries (all layers *must* pass these tests) */
if(layer->numclasses > 0) {
for(i=0; i<layer->numclasses; i++) {
if((layer->class[i]->maxscaledenom > 0) && (map->scaledenom > layer->class[i]->maxscaledenom))
continue; /* can skip this one, next class */
if((layer->class[i]->minscaledenom > 0) && (map->scaledenom <= layer->class[i]->minscaledenom))
continue; /* can skip this one, next class */
break; /* can't skip this class (or layer for that matter) */
}
if(i == layer->numclasses) {
if( layer->debug >= MS_DEBUGLEVEL_V ) {
msDebug("msLayerIsVisible(): Skipping layer (%s) because no CLASS in the layer is in-scale for this MAP scale\n", layer->name);
}
return(MS_FALSE);
}
}
}
if (layer->maxscaledenom <= 0 && layer->minscaledenom <= 0) {
if((layer->maxgeowidth > 0) && ((map->extent.maxx - map->extent.minx) > layer->maxgeowidth)) {
if( layer->debug >= MS_DEBUGLEVEL_V ) {
msDebug("msLayerIsVisible(): Skipping layer (%s) because LAYER width is much smaller than map width\n", layer->name);
}
return(MS_FALSE);
}
if((layer->mingeowidth > 0) && ((map->extent.maxx - map->extent.minx) < layer->mingeowidth)) {
if( layer->debug >= MS_DEBUGLEVEL_V ) {
msDebug("msLayerIsVisible(): Skipping layer (%s) because LAYER width is much larger than map width\n", layer->name);
}
return(MS_FALSE);
}
}
return MS_TRUE; /* All tests passed. Layer is visible. */
}
/*
* Generic function to render a layer object.
*/
int msDrawLayer(mapObj *map, layerObj *layer, imageObj *image)
{
imageObj *image_draw = image;
outputFormatObj *altFormat=NULL;
int retcode=MS_SUCCESS;
int originalopacity = layer->opacity;
const char *alternativeFomatString = NULL;
layerObj *maskLayer = NULL;
if(!msLayerIsVisible(map, layer))
return MS_SUCCESS;
if(layer->opacity == 0) return MS_SUCCESS; /* layer is completely transparent, skip it */
/* conditions may have changed since this layer last drawn, so set
layer->project true to recheck projection needs (Bug #673) */
layer->project = MS_TRUE;
if(layer->mask) {
int maskLayerIdx;
/* render the mask layer in its own imageObj */
if(!MS_IMAGE_RENDERER(image)->supports_pixel_buffer) {
msSetError(MS_MISCERR, "Layer (%s) references references a mask layer, but the selected renderer does not support them", "msDrawLayer()",
layer->name);
return (MS_FAILURE);
}
maskLayerIdx = msGetLayerIndex(map,layer->mask);
if(maskLayerIdx == -1) {
msSetError(MS_MISCERR, "Layer (%s) references unknown mask layer (%s)", "msDrawLayer()",
layer->name,layer->mask);
return (MS_FAILURE);
}
maskLayer = GET_LAYER(map, maskLayerIdx);
if(!maskLayer->maskimage) {
int i;
int origstatus, origlabelcache;
altFormat = msSelectOutputFormat(map, "png24");
msInitializeRendererVTable(altFormat);
/* TODO: check the png24 format hasn't been tampered with, i.e. it's agg */
maskLayer->maskimage= msImageCreate(image->width, image->height,altFormat,
image->imagepath, image->imageurl, map->resolution, map->defresolution, NULL);
if (!maskLayer->maskimage) {
msSetError(MS_MISCERR, "Unable to initialize mask image.", "msDrawLayer()");
return (MS_FAILURE);
}
/*
* force the masked layer to status on, and turn off the labelcache so that
* eventual labels are added to the temporary image instead of being added
* to the labelcache
*/
origstatus = maskLayer->status;
origlabelcache = maskLayer->labelcache;
maskLayer->status = MS_ON;
maskLayer->labelcache = MS_OFF;
/* draw the mask layer in the temporary image */
retcode = msDrawLayer(map, maskLayer, maskLayer->maskimage);
maskLayer->status = origstatus;
maskLayer->labelcache = origlabelcache;
if(retcode != MS_SUCCESS) {
return MS_FAILURE;
}
/*
* hack to work around bug #3834: if we have use an alternate renderer, the symbolset may contain
* symbols that reference it. We want to remove those references before the altFormat is destroyed
* to avoid a segfault and/or a leak, and so the the main renderer doesn't pick the cache up thinking
* it's for him.
*/
for(i=0; i<map->symbolset.numsymbols; i++) {
if (map->symbolset.symbol[i]!=NULL) {
symbolObj *s = map->symbolset.symbol[i];
if(s->renderer == MS_IMAGE_RENDERER(maskLayer->maskimage)) {
MS_IMAGE_RENDERER(maskLayer->maskimage)->freeSymbol(s);
s->renderer = NULL;
}
}
}
/* set the imagetype from the original outputformat back (it was removed by msSelectOutputFormat() */
msFree(map->imagetype);
map->imagetype = msStrdup(image->format->name);
}
}
altFormat = NULL;
/* inform the rendering device that layer draw is starting. */
msImageStartLayer(map, layer, image);
/*check if an alternative renderer should be used for this layer*/
alternativeFomatString = msLayerGetProcessingKey( layer, "RENDERER");
if (MS_RENDERER_PLUGIN(image_draw->format) && alternativeFomatString!=NULL &&
(altFormat= msSelectOutputFormat(map, alternativeFomatString))) {
rendererVTableObj *renderer=NULL;
msInitializeRendererVTable(altFormat);
image_draw = msImageCreate(image->width, image->height,
altFormat, image->imagepath, image->imageurl, map->resolution, map->defresolution, &map->imagecolor);
renderer = MS_IMAGE_RENDERER(image_draw);
renderer->startLayer(image_draw,map,layer);
} else if (MS_RENDERER_PLUGIN(image_draw->format)) {
rendererVTableObj *renderer = MS_IMAGE_RENDERER(image_draw);
if ((layer->mask && layer->connectiontype!=MS_WMS && layer->type != MS_LAYER_RASTER) || (layer->opacity > 0 && layer->opacity < 100)) {
/* masking occurs at the pixel/layer level for raster images, so we don't need to create a temporary image
in these cases
*/
if (layer->mask || !renderer->supports_transparent_layers) {
image_draw = msImageCreate(image->width, image->height,
image->format, image->imagepath, image->imageurl, map->resolution, map->defresolution, NULL);
if (!image_draw) {
msSetError(MS_MISCERR, "Unable to initialize temporary transparent image.",
"msDrawLayer()");
return (MS_FAILURE);
}
/* set opacity to full, as the renderer should be rendering a fully opaque image */
layer->opacity=100;
renderer->startLayer(image_draw,map,layer);
}
}
}
/*
** redirect procesing of some layer types.
*/
if(layer->connectiontype == MS_WMS) {
#ifdef USE_WMS_LYR
retcode = msDrawWMSLayer(map, layer, image_draw);
#else
retcode = MS_FAILURE;
#endif
} else if(layer->type == MS_LAYER_RASTER) {
retcode = msDrawRasterLayer(map, layer, image_draw);
} else if(layer->type == MS_LAYER_CHART) {
retcode = msDrawChartLayer(map, layer, image_draw);
} else { /* must be a Vector layer */
retcode = msDrawVectorLayer(map, layer, image_draw);
}
if (altFormat) {
rendererVTableObj *renderer = MS_IMAGE_RENDERER(image);
rendererVTableObj *altrenderer = MS_IMAGE_RENDERER(image_draw);
rasterBufferObj rb;
int i;
memset(&rb,0,sizeof(rasterBufferObj));
altrenderer->endLayer(image_draw,map,layer);
altrenderer->getRasterBufferHandle(image_draw,&rb);
renderer->mergeRasterBuffer(image,&rb,layer->opacity*0.01,0,0,0,0,rb.width,rb.height);
/*
* hack to work around bug #3834: if we have use an alternate renderer, the symbolset may contain
* symbols that reference it. We want to remove those references before the altFormat is destroyed
* to avoid a segfault and/or a leak, and so the the main renderer doesn't pick the cache up thinking
* it's for him.
*/
for(i=0; i<map->symbolset.numsymbols; i++) {
if (map->symbolset.symbol[i]!=NULL) {
symbolObj *s = map->symbolset.symbol[i];
if(s->renderer == altrenderer) {
altrenderer->freeSymbol(s);
s->renderer = NULL;
}
}
}
msFreeImage(image_draw);
/* set the imagetype from the original outputformat back (it was removed by msSelectOutputFormat() */
msFree(map->imagetype);
map->imagetype = msStrdup(image->format->name);
} else if( image != image_draw) {
rendererVTableObj *renderer = MS_IMAGE_RENDERER(image_draw);
rasterBufferObj rb;
memset(&rb,0,sizeof(rasterBufferObj));
renderer->endLayer(image_draw,map,layer);
layer->opacity = originalopacity;
renderer->getRasterBufferHandle(image_draw,&rb);
if(maskLayer && maskLayer->maskimage) {
rasterBufferObj mask;
unsigned int row,col;
memset(&mask,0,sizeof(rasterBufferObj));
MS_IMAGE_RENDERER(maskLayer->maskimage)->getRasterBufferHandle(maskLayer->maskimage,&mask);
/* modify the pixels of the overlay */
if(rb.type == MS_BUFFER_BYTE_RGBA) {
for(row=0; row<rb.height; row++) {
unsigned char *ma,*a,*r,*g,*b;
r=rb.data.rgba.r+row*rb.data.rgba.row_step;
g=rb.data.rgba.g+row*rb.data.rgba.row_step;
b=rb.data.rgba.b+row*rb.data.rgba.row_step;
a=rb.data.rgba.a+row*rb.data.rgba.row_step;
ma=mask.data.rgba.a+row*mask.data.rgba.row_step;
for(col=0; col<rb.width; col++) {
if(*ma == 0) {
*a = *r = *g = *b = 0;
}
a+=rb.data.rgba.pixel_step;
r+=rb.data.rgba.pixel_step;
g+=rb.data.rgba.pixel_step;
b+=rb.data.rgba.pixel_step;
ma+=mask.data.rgba.pixel_step;
}
}
#ifdef USE_GD
} else if(rb.type == MS_BUFFER_GD) {
for(row=0; row<rb.height; row++) {
unsigned char *ma;
ma=mask.data.rgba.a+row*mask.data.rgba.row_step;
for(col=0; col<rb.width; col++) {
if(*ma == 0) {
gdImageSetPixel(rb.data.gd_img,col,row,0);
}
ma+=mask.data.rgba.pixel_step;
}
}
#endif
}
}
renderer->mergeRasterBuffer(image,&rb,layer->opacity*0.01,0,0,0,0,rb.width,rb.height);
msFreeImage(image_draw);
}
msImageEndLayer(map,layer,image);
return(retcode);
}
int msDrawVectorLayer(mapObj *map, layerObj *layer, imageObj *image)
{
int status, retcode=MS_SUCCESS;
int drawmode=MS_DRAWMODE_FEATURES;
char annotate=MS_TRUE;
shapeObj shape;
rectObj searchrect;
char cache=MS_FALSE;
int maxnumstyles=1;
featureListNodeObjPtr shpcache=NULL, current=NULL;
int nclasses = 0;
int *classgroup = NULL;
double minfeaturesize = -1;
int maxfeatures=-1;
int featuresdrawn=0;
if (image)
maxfeatures=msLayerGetMaxFeaturesToDraw(layer, image->format);
/* TODO TBT: draw as raster layer in vector renderers */
annotate = msEvalContext(map, layer, layer->labelrequires);
if(map->scaledenom > 0) {
if((layer->labelmaxscaledenom != -1) && (map->scaledenom >= layer->labelmaxscaledenom)) annotate = MS_FALSE;
if((layer->labelminscaledenom != -1) && (map->scaledenom < layer->labelminscaledenom)) annotate = MS_FALSE;
}
#ifdef USE_GD
/* reset layer pen values just in case the map has been previously processed */
msClearLayerPenValues(layer);
#endif
/* open this layer */
status = msLayerOpen(layer);
if(status != MS_SUCCESS) return MS_FAILURE;
/* build item list */
status = msLayerWhichItems(layer, MS_FALSE, NULL);
if(status != MS_SUCCESS) {
msLayerClose(layer);
return MS_FAILURE;
}
/* identify target shapes */
if(layer->transform == MS_TRUE) {
searchrect = map->extent;
#ifdef USE_PROJ
if((map->projection.numargs > 0) && (layer->projection.numargs > 0))
msProjectRect(&map->projection, &layer->projection, &searchrect); /* project the searchrect to source coords */
#endif
}
else {
searchrect.minx = searchrect.miny = 0;
searchrect.maxx = map->width-1;
searchrect.maxy = map->height-1;
}
status = msLayerWhichShapes(layer, searchrect, MS_FALSE);
if(status == MS_DONE) { /* no overlap */
msLayerClose(layer);
return MS_SUCCESS;
} else if(status != MS_SUCCESS) {
msLayerClose(layer);
return MS_FAILURE;
}
/* step through the target shapes */
msInitShape(&shape);
nclasses = 0;
classgroup = NULL;
if(layer->classgroup && layer->numclasses > 0)
classgroup = msAllocateValidClassGroups(layer, &nclasses);
if(layer->minfeaturesize > 0)
minfeaturesize = Pix2LayerGeoref(map, layer, layer->minfeaturesize);
while((status = msLayerNextShape(layer, &shape)) == MS_SUCCESS) {
/* Check if the shape size is ok to be drawn */
if((shape.type == MS_SHAPE_LINE || shape.type == MS_SHAPE_POLYGON) && (minfeaturesize > 0) && (msShapeCheckSize(&shape, minfeaturesize) == MS_FALSE)) {
if(layer->debug >= MS_DEBUGLEVEL_V)
msDebug("msDrawVectorLayer(): Skipping shape (%d) because LAYER::MINFEATURESIZE is bigger than shape size\n", shape.index);
msFreeShape(&shape);
continue;
}
shape.classindex = msShapeGetClass(layer, map, &shape, classgroup, nclasses);
if((shape.classindex == -1) || (layer->class[shape.classindex]->status == MS_OFF)) {
msFreeShape(&shape);
continue;
}
if(maxfeatures >=0 && featuresdrawn >= maxfeatures) {
status = MS_DONE;
break;