mapgd.c

/******************************************************************************
 * $Id$
 *
 * Project:  MapServer
 * Purpose:  GD rendering functions (using renderer plugin API)
 * Author:   Stephen Lime, Thomas Bonfort
 *
 ******************************************************************************
 * Copyright (c) 1996-2009 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 "mapserver.h"
#ifdef USE_GD

#include "mapthread.h"
#include <time.h>
#include <gdfonts.h>
#include <gdfontl.h>
#include <gdfontt.h>
#include <gdfontmb.h>
#include <gdfontg.h>

#ifdef _WIN32
#include <fcntl.h>
#include <io.h>
#endif

int msGDSetup() {
  if (gdFontCacheSetup() != 0) {
    return MS_FAILURE;
  }
  return MS_SUCCESS;
}

void msGDCleanup(int signal) {
    if(!signal) {
        /* there's a potential deadlock if we're killed by a signal and the font
         cache is already locked. We don't tear down the fontcache in this case
         to avoid it (issue 4093)*/
        gdFontCacheShutdown();
    }
}

#define MS_IMAGE_GET_GDIMAGEPTR(image) ((gdImagePtr) image->img.plugin)

fontMetrics bitmapFontMetricsGD[5];

gdFontPtr msGetBitmapFont(int size)
{
  switch(size) { /* set the font to use */
  case MS_TINY:
    return gdFontGetTiny();
    break;
  case MS_SMALL:
    return gdFontGetSmall();
    break;
  case MS_MEDIUM:
    return gdFontGetMediumBold();
    break;
  case MS_LARGE:
    return gdFontGetLarge();
    break;
  case MS_GIANT:
    return gdFontGetGiant();
    break;
  default:
    msSetError(MS_GDERR,"Invalid bitmap font. Must be one of tiny, small, medium, large or giant." , "msGetBitmapFont()");
    return(NULL);
  }
}

int msImageSetPenGD(gdImagePtr img, colorObj *color) 
{
  if(MS_VALID_COLOR(*color))
    color->pen = gdImageColorResolve(img, color->red, color->green, color->blue);
  else
    color->pen = -1;

  return(MS_SUCCESS);
}

int startNewLayerGD(imageObj *img, mapObj *map, layerObj *layer) {
	return MS_SUCCESS;
}

int closeNewLayerGD(imageObj *img, mapObj *map, layerObj *layer) {
	return MS_SUCCESS;
}

/*
** GD driver-specific image handling functions.
*/
imageObj *createImageGD(int width, int height, outputFormatObj *format, colorObj* bg) 
{
  imageObj *img = NULL;
  gdImagePtr ip;

  img = (imageObj *) calloc(1, sizeof (imageObj));
  MS_CHECK_ALLOC(img, sizeof (imageObj), NULL); 

  /* we're only doing PC256 for the moment */
  ip = gdImageCreate(width, height);
  if(!format->transparent && bg && MS_VALID_COLOR(*bg))
	  gdImageColorAllocate(ip, bg->red, bg->green, bg->blue); /* set the background color */
  else {
	  gdImageColorAllocate(ip,117,17,91); /*random bg color (same one as picked in msResampleGDALToMap) */
	  gdImageColorTransparent(ip, 0);
  }

  img->img.plugin = (void *) ip;
  return img;
}



int saveImageGD(imageObj *img, mapObj *map, FILE *fp, outputFormatObj *format) 
{
  gdImagePtr ip;

  if(!img || !fp) return MS_FAILURE;
  if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
  
  return saveGdImage(ip,fp,format);
  
}

int freeImageGD(imageObj *img) 
{
  gdImagePtr ip;

  if(img) {
    ip = MS_IMAGE_GET_GDIMAGEPTR(img);
    if(ip) gdImageDestroy(ip);
  }
  
  return MS_SUCCESS;
}

/*
** GD driver-specific rendering functions.
*/
#define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t))

#define SETPEN(ip, c) if(c && c->pen == MS_PEN_UNSET) c->pen = gdImageColorResolve(ip, c->red, c->green, c->blue)


static void imageScanline(gdImagePtr im, int x1, int x2, int y, int c)
{
  int x;

  /* TO DO: This fix (adding if/then) was to address circumstances in the polygon fill code */
  /* where x2 < x1. There may be something wrong in that code, but at any rate this is safer. */

  if(x1 < x2)
    for(x=x1; x<=x2; x++) gdImageSetPixel(im, x, y, c);
  else
    for(x=x2; x<=x1; x++) gdImageSetPixel(im, x, y, c);
}

/*
** Polygon fill. Based on "Concave Polygon Scan Conversion" by Paul
** Heckbert from "Graphics Gems", Academic Press, 1990.
**
*/
static void imageFilledPolygon(gdImagePtr im, shapeObj *p, int c)
{
  typedef struct {     /* a polygon edge */
    double x;          /* x coordinate of edge's intersection with current scanline */
    double dx;         /* change in x with respect to y */
    int i;             /* point index  */
    int l;             /* line number */
    int s;             /* scanline */
  } pEdge;
     
  pointObj *point1, *point2;
     
  int k, l, i, j, xl, xr, ymin, ymax, y, n,nvert, nact, m;
  int wrong_order;
     
  pEdge *edge, *temp;
  pEdge  **active;
  int *yhist, *edgeindex;
     
  if(p->numlines == 0) return;
  n=0;
     
  for(i=0; i<p->numlines; i++) {
   n += p->line[i].numpoints;
  }
     
  if(n == 0)   return;

  edge = (pEdge *) msSmallCalloc(n,sizeof(pEdge));           /* All edges in the polygon */
  edgeindex =  (int *) msSmallCalloc(n,sizeof(int));         /* Index to edges sorted by scanline */
  active = (pEdge **) msSmallCalloc(n,sizeof(pEdge*));       /* Pointers to active edges for current scanline */
    
  nvert=0;
     
  ymin= (int) ceil(p->line[0].point[0].y-0.5);
  ymax= (int) floor(p->line[0].point[0].y-0.5);
     
  /* populate the edge table */
  for(l=0; l<p->numlines; l++) {
    for(i=0; i < p->line[l].numpoints; i++) {
      j = i < p->line[l].numpoints -1 ? i+1 : 0;
      if (p->line[l].point[i].y  < p->line[l].point[j].y ) {
        point1 = &(p->line[l].point[i]);
        point2 = &(p->line[l].point[j]);
      } else {
        point2 = &(p->line[l].point[i]);
        point1 = &(p->line[l].point[j]);
      }
               
      edge[nvert].dx  = point2->y == point1->y ? 0 :  (point2->x - point1->x) / (point2->y - point1->y);
      edge[nvert].s = MS_NINT( p->line[l].point[i].y );  /* ceil( p->line[l].point[i].y  - 0.5 ); */
      edge[nvert].x = point1->x;
      edge[nvert].i = nvert;
      edge[nvert].l = l;
               
      ymin = MS_MIN(ymin,edge[nvert].s);
      ymax = MS_MAX(ymax,edge[nvert].s);

      nvert++;
    }
  }
   
  /* Use histogram sort to create a bucket-sorted edgeindex by scanline */
  yhist = (int*) msSmallCalloc(ymax - ymin + 2, sizeof(int));

  for(i=0;i<nvert;i++) {
    yhist[ edge[i].s - ymin + 1 ]++;
  }
  for(i=0; i<=(ymax - ymin); i++)  {/* Calculate starting point in edgeindex for each scanline */
    yhist[i+1] += yhist[i]; 
  }
  for(i=0;i<nvert;i++){ /* Bucket sort edges into edgeindex */
    y = edge[i].s;
    edgeindex[yhist[y-ymin]] = i;
    yhist[y-ymin]++;
  }
  free(yhist);
   
  k=0;
  nact=0;

  for (y=ymin; y<=ymax; y++) { /* step through scanlines */
    /* scanline y is at y+.5 in continuous coordinates */
          
    /* check vertices between previous scanline and current one, if any */
    for (; k<nvert && edge[edgeindex[k]].s <= y; k++) {
      i = edge[edgeindex[k]].i;
               
      /* vertex previous to i */
      if(i==0 || edge[i].l != edge[i-1].l)
        j = i +  p->line[edge[i].l].numpoints - 1;
      else
        j = i - 1;
               
      if (edge[j].s  <=  y  ) { /* old edge, remove from active list */
        for (m=0; m<nact && active[m]->i!=j; m++);
          if (m<nact) {
            nact--;
            active[m]=active[nact];
          }
      } else if (edge[j].s > y) { /* new edge,  insert into active list */
        active[nact]= & edge[j];
        nact++;
      }
               
      /* vertex next  after i */
      if(i==nvert-1 || edge[i].l != edge[i+1].l)
        j = i - p->line[edge[i].l].numpoints  + 1;
      else
        j = i + 1;

      if (edge[j].s  <=  y - 1 ) {     /* old edge, remove from active list */
        for (m=0; m<nact && active[m]->i!=i; m++);
          if (m<nact) {
            nact--;
            active[m]=active[nact];
          }
      } else if (edge[j].s > y ) { /* new edge, insert into active list */
        active[nact]= & edge[i];
        nact++;
      }
    }
          
    /* Sort active edges by x */
    do {
      wrong_order = 0;
      for(i=0; i < nact-1; i++) {
        if(active[i]->x > active[i+1]->x) {
          wrong_order = 1;
          SWAP(active[i], active[i+1], temp);
        }
      }
    } while(wrong_order);

    /* draw horizontal spans for scanline y */
    for (j=0; j<nact; j+=2) {	
      /* j -> j+1 is inside,  j+1 -> j+2 is outside */
      xl = (int) MS_NINT(active[j]->x );  
      xr = (int) (active[j+1]->x - 0.5) ;

      if(active[j]->x != active[j+1]->x) 
        imageScanline(im, xl, xr, y, c);
               
      active[j]->x += active[j]->dx;	/* increment edge coords */
      active[j+1]->x += active[j+1]->dx;
    }
  }
     
  free(active);
  free(edgeindex);
  free(edge);
}

static void imagePolyline(gdImagePtr im, shapeObj *p, int c)
{
  int i, j;

  for (i=0; i < p->numlines; i++) {
     lineObj *line = &(p->line[i]);
    for(j=1; j<line->numpoints; j++) {
       pointObj *point1 = &line->point[j-1];
       pointObj *point2 = &line->point[j];
              
       gdImageLine(im, (int) point1->x, (int) point1->y, (int) point2->x, (int) point2->y, c);
    }
  }
}

int renderLineGD(imageObj *img, shapeObj *p, strokeStyleObj *stroke) 
{
  gdImagePtr ip;
  int c;
  gdImagePtr brush=NULL;
  
  if(!img || !p || !stroke) return MS_FAILURE;
  if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;

  SETPEN(ip, stroke->color);
  c = stroke->color->pen;

  if(stroke->patternlength > 0) {
    int *style;
    int i, j, k=0;
    int sc;

    for(i=0; i<stroke->patternlength; i++)
      k += MS_NINT(stroke->pattern[i]);
    style = (int *) malloc (k * sizeof(int));
    MS_CHECK_ALLOC(style, k * sizeof(int), MS_FAILURE);

    sc = c; /* start with the color */    

    k=0;
    for(i=0; i<stroke->patternlength; i++) {
      for(j=0; j<MS_NINT(stroke->pattern[i]); j++, k++) {
        style[k] = sc;
      }
      sc = ((sc==c)?gdTransparent:c);
    }

    gdImageSetStyle(ip, style, k);
    free(style);

    c = gdStyled;
  }

  if(stroke->width > 1) {
     int brush_fc;
     brush = gdImageCreate(ceil(stroke->width), ceil(stroke->width));
     gdImageColorAllocate(brush, gdImageRed(ip,0), gdImageGreen(ip, 0), gdImageBlue(ip, 0));
     gdImageColorTransparent(brush,0);
     brush_fc = gdImageColorAllocate(brush, gdImageRed(ip,stroke->color->pen),
           gdImageGreen(ip,stroke->color->pen), gdImageBlue(ip,stroke->color->pen));
     gdImageFilledEllipse(brush,MS_NINT(brush->sx/2),MS_NINT(brush->sy/2),
           MS_NINT(stroke->width),MS_NINT(stroke->width), brush_fc);
     gdImageSetBrush(ip, brush);
     if(stroke->patternlength > 0) {
       c = gdStyledBrushed;
     } else {
       c = gdBrushed;
     }
  }
    
  /* finally draw something */
  imagePolyline(ip, p, c);

  /* clean up */
  if(stroke->width>1) {
     gdImageDestroy(brush);
  }
  return MS_SUCCESS;
}

int renderPolygonGD(imageObj *img, shapeObj *p, colorObj *color) 
{  
  gdImagePtr ip;

  if(!img || !p || !color) return MS_FAILURE;
  if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
  SETPEN(ip, color);
  imageFilledPolygon(ip, p, color->pen);
  return MS_SUCCESS;
}

int renderGlyphsLineGD(imageObj *img, labelPathObj *labelpath, labelStyleObj *style, char *text) {
  return MS_SUCCESS;
}

int renderGlyphsGD(imageObj *img, double x, double y, labelStyleObj *style, char *text) {
   gdImagePtr ip;
   char *error=NULL;
   int bbox[8];
   int c = 0,oc = 0;
   x = MS_NINT(x);
   y = MS_NINT(y);
   if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
   if(!text || !strlen(text)) return(MS_SUCCESS); /* not errors, just don't want to do anything */

   SETPEN(ip, style->color);
   SETPEN(ip, style->outlinecolor);

   if(style->antialias) {
      if(style->color)
         c = style->color->pen;
      if(style->outlinewidth > 0)
         oc = style->outlinecolor->pen;
   } else {
      if(style->color)
         c = -style->color->pen;
      if(style->outlinewidth > 0)
         oc = -style->outlinecolor->pen;
   }
   
   if(style->outlinewidth > 0) { /* handle the outline color */
      error = gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x, y-1, text);
      if(error) {
         msSetError(MS_TTFERR, error, "msDrawTextGD()");
         return(MS_FAILURE);
      }

      gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x, y+1, text);
      gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x+1, y, text);
      gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x-1, y, text);
      gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x-1, y-1, text);      
      gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x-1, y+1, text);
      gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x+1, y-1, text);
      gdImageStringFT(ip, bbox, oc, style->fonts[0], style->size, style->rotation, x+1, y+1, text);
   }
   
   if(style->color)
      gdImageStringFT(ip, bbox, c, style->fonts[0], style->size, style->rotation, x, y, text);
   return MS_SUCCESS;
}

int renderEllipseSymbolGD(imageObj *img, double x, double y, symbolObj *symbol, symbolStyleObj *style) {
   /* check for trivial cases - 1x1 and 2x2, GD does not do these well */
   gdImagePtr ip;
   int w,h,fc,oc;
   if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
   SETPEN(ip, style->color);
   SETPEN(ip, style->outlinecolor);
   fc = style->color ? style->color->pen : -1;
   oc = style->outlinecolor ? style->outlinecolor->pen : -1;
   
   if(oc==-1 && fc ==-1) {
      return MS_SUCCESS;
   }
   
   w = symbol->sizex * style->scale;
   h = symbol->sizey * style->scale;
   
   if(w==1 && h==1) {
      if(fc >= 0)
         gdImageSetPixel(ip, x, y, fc);
      else 
         gdImageSetPixel(ip, x, y, oc);
      return MS_SUCCESS;
   }

   if(w==2 && h==2) {
      if(oc >= 0) {
         gdImageSetPixel(ip, x, y, oc);
         gdImageSetPixel(ip, x, y+1, oc);
         gdImageSetPixel(ip, x+1, y, oc);
         gdImageSetPixel(ip, x+1, y+1, oc);
      } else {
         gdImageSetPixel(ip, x, y, fc);
         gdImageSetPixel(ip, x, y+1, fc);
         gdImageSetPixel(ip, x+1, y, fc);
         gdImageSetPixel(ip, x+1, y+1, fc);
      }
      return MS_SUCCESS;
   }

   if(symbol->filled) {
      if(fc >= 0) gdImageFilledEllipse(ip, x, y, w, h, fc);        
      if(oc >= 0) gdImageArc(ip, x, y, w, h, 0, 360, oc);
   } else {
      if(fc < 0) fc = oc; /* try the outline color */
      gdImageArc(ip, x, y, w, h, 0, 360, fc);
   }
   return MS_SUCCESS;
}

static void get_bbox(pointObj *poiList, int numpoints, double *minx, double *miny, double *maxx, double *maxy) {
  int j;

  *minx = *maxx = poiList[0].x;
  *miny = *maxy = poiList[0].y;
  for(j=1; j<numpoints; j++) {
    if ((poiList[j].x==-99.0) || (poiList[j].y==-99.0)) continue;
    *minx = MS_MIN(*minx, poiList[j].x);
    *maxx = MS_MAX(*maxx, poiList[j].x);
    *miny = MS_MIN(*miny, poiList[j].y);
    *maxy = MS_MAX(*maxy, poiList[j].y);
  }

  return;
}

symbolObj* rotateVectorSymbolPoints(symbolObj *symbol, double angle_rad) {
   double dp_x, dp_y, xcor, ycor;
   double sin_a, cos_a;
   double minx,miny,maxx,maxy;
   symbolObj *newSymbol;
   double TOL=0.00000000001;
   int i;
   
   angle_rad = -angle_rad;
   
   newSymbol = (symbolObj *) msSmallMalloc(sizeof(symbolObj));
   msCopySymbol(newSymbol, symbol, NULL);
   
   sin_a = sin(angle_rad);
   cos_a = cos(angle_rad);

   dp_x = symbol->sizex * .5; /* get the shift vector at 0,0 */
   dp_y = symbol->sizey * .5;

   /* center at 0,0 and rotate; then move back */
   for( i=0;i < symbol->numpoints;i++) {
      /* don't rotate PENUP commands (TODO: should use a constant here) */
      if ((symbol->points[i].x == -99.0) && (symbol->points[i].x == -99.0) ) {
         newSymbol->points[i].x = -99.0;
         newSymbol->points[i].y = -99.0;
         continue;
      }

      newSymbol->points[i].x = dp_x + ((symbol->points[i].x-dp_x)*cos_a - (symbol->points[i].y-dp_y)*sin_a);
      newSymbol->points[i].y = dp_y + ((symbol->points[i].x-dp_x)*sin_a + (symbol->points[i].y-dp_y)*cos_a);
   }

   /* get the new bbox of the symbol, because we need it to get the new dimensions of the new symbol */
   get_bbox(newSymbol->points, newSymbol->numpoints, &minx, &miny, &maxx, &maxy);
   if ( (fabs(minx)>TOL) || (fabs(miny)>TOL) ) {
      xcor = minx*-1.0; /* symbols always start at 0,0 so get the shift vector */
      ycor = miny*-1.0;
      for( i=0;i < newSymbol->numpoints;i++) {
         if ((newSymbol->points[i].x == -99.0) && (newSymbol->points[i].x == -99.0))
            continue;
         newSymbol->points[i].x = newSymbol->points[i].x + xcor;
         newSymbol->points[i].y = newSymbol->points[i].y + ycor;
      }

      /* update the bbox to get the final dimension values for the symbol */
      get_bbox(newSymbol->points, newSymbol->numpoints, &minx, &miny, &maxx, &maxy);
   }
   newSymbol->sizex = maxx;
   newSymbol->sizey = maxy;
   return newSymbol;
}

int renderVectorSymbolGD(imageObj *img, double x, double y, symbolObj *symbol, symbolStyleObj *style) {
   int bRotated = MS_FALSE;
   int j,k;
   gdImagePtr ip;
   gdPoint mPoints[MS_MAXVECTORPOINTS];
   gdPoint oldpnt,newpnt;
   int fc,oc;
   if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
   
   
   SETPEN(ip, style->color);
   SETPEN(ip, style->outlinecolor);
   fc = style->color ? style->color->pen : -1;
   oc = style->outlinecolor ? style->outlinecolor->pen : -1;
   
   if(oc==-1 && fc ==-1) {
      return MS_SUCCESS;
   }
   
   if (style->rotation != 0.0) {      
      bRotated = MS_TRUE;
      symbol = rotateVectorSymbolPoints(symbol, style->rotation);
      if(!symbol) {
         return MS_FAILURE;
      }
   }

   /* We avoid MS_NINT in this context because the potentially variable
          handling of 0.5 rounding is often a problem for symbols which are
          often an odd size (ie. 7pixels) and so if "p" is integral the 
          value is always on a 0.5 boundary - bug 1716 */
   x -= style->scale*.5*symbol->sizex;
   y -= style->scale*.5*symbol->sizey;

   if(symbol->filled) { /* if filled */

      k = 0; /* point counter */
      for(j=0;j < symbol->numpoints;j++) {
         if((symbol->points[j].x == -99) && (symbol->points[j].x == -99)) { /* new polygon (PENUP) */
            if(k>2) {
               if(fc >= 0)
                  gdImageFilledPolygon(ip, mPoints, k, fc);
               if(oc >= 0)
                  gdImagePolygon(ip, mPoints, k, oc);
            }
            k = 0; /* reset point counter */
         } else {
            mPoints[k].x = MS_NINT(style->scale*symbol->points[j].x + x);
            mPoints[k].y = MS_NINT(style->scale*symbol->points[j].y + y); 
            k++;
         }
      }

      if(fc >= 0)
         gdImageFilledPolygon(ip, mPoints, k, fc);
      if(oc >= 0)
         gdImagePolygon(ip, mPoints, k, oc);

   } else  { /* NOT filled */     

      if(oc >= 0) fc = oc; /* try the outline color (reference maps sometimes do this when combining a box and a custom vector marker */
      
      oldpnt.x = MS_NINT(style->scale*symbol->points[0].x + x); /* convert first point in marker */
      oldpnt.y = MS_NINT(style->scale*symbol->points[0].y + y);

      gdImageSetThickness(ip, style->outlinewidth);

      for(j=1;j < symbol->numpoints;j++) { /* step through the marker */
         if((symbol->points[j].x != -99) || (symbol->points[j].x != -99)) {
            if((symbol->points[j-1].x == -99) && (symbol->points[j-1].y == -99)) { /* Last point was PENUP, now a new beginning */
               oldpnt.x = MS_NINT(style->scale*symbol->points[j].x + x);
               oldpnt.y = MS_NINT(style->scale*symbol->points[j].y + y);
            } else {
               newpnt.x = MS_NINT(style->scale*symbol->points[j].x + x);
               newpnt.y = MS_NINT(style->scale*symbol->points[j].y + y);
               gdImageLine(ip, oldpnt.x, oldpnt.y, newpnt.x, newpnt.y, fc);
               oldpnt = newpnt;
            }
         }
      } /* end for loop */   

      gdImageSetThickness(ip, 1); /* restore thinkness */
   } /* end if-then-else */

   if(bRotated) {
      msFreeSymbol(symbol); /* clean up */
      msFree(symbol);
   }
   return MS_SUCCESS;
}

int renderTruetypeSymbolGD(imageObj *img, double x, double y, symbolObj *symbol, symbolStyleObj *s) {
   int bbox[8];
   char *error;
   int c,oc = 0;
   gdImagePtr ip;
   if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
   SETPEN(ip, s->color);
   SETPEN(ip, s->outlinecolor);
   
   if(s->style->antialias) {
      c = s->color->pen;
      if(s->outlinecolor)
         oc = s->outlinecolor->pen;
   } else {
      c = -s->color->pen;
      if(s->outlinecolor)
         oc = -s->outlinecolor->pen;
   }
   gdImageStringFT(NULL, bbox, c, symbol->full_font_path, s->scale, s->rotation, 0,0, symbol->character);
   
   x -=  (bbox[2] - bbox[0])/2 + bbox[0];
   y +=  (bbox[1] - bbox[5])/2 - bbox[1];

   if( s->outlinecolor ) {
      error = gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x, y-1, symbol->character);
      if(error) {
         msSetError(MS_TTFERR, error, "msDrawMarkerSymbolGD()");
         return MS_FAILURE;
      }

      gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x, y+1, symbol->character);
      gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x+1, y, symbol->character);
      gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x-1, y, symbol->character);
      gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x+1, y+1, symbol->character);
      gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x+1, y-1, symbol->character);
      gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x-1, y+1, symbol->character);
      gdImageStringFT(ip, bbox, oc, symbol->full_font_path, s->scale, s->rotation, x-1, y-1, symbol->character);
   }
   if(s->color)
	   gdImageStringFT(ip, bbox, c, symbol->full_font_path, s->scale, s->rotation, x, y, symbol->character);
  return MS_SUCCESS;
}

gdImagePtr rotatePixmapGD(gdImagePtr img, double angle_rad) {
   gdImagePtr rimg = NULL;
   double cos_a, sin_a;
   double x1 = 0.0, y1 = 0.0; /* destination rectangle */
   double x2 = 0.0, y2 = 0.0;
   double x3 = 0.0, y3 = 0.0;
   double x4 = 0.0, y4 = 0.0;

   long minx, miny, maxx, maxy;

   int width=0, height=0;
   /* int color; */

   sin_a = sin(angle_rad);
   cos_a = cos(angle_rad);

   /* compute distination rectangle (x1,y1 is known) */
   x1 = 0 ; y1 = 0 ;
   x2 = img->sy * sin_a;
   y2 = -img->sy * cos_a;
   x3 = (img->sx * cos_a) + (img->sy * sin_a);
   y3 = (img->sx * sin_a) - (img->sy * cos_a);
   x4 = (img->sx * cos_a);
   y4 = (img->sx * sin_a);

   minx = (long) MS_MIN(x1,MS_MIN(x2,MS_MIN(x3,x4)));
   miny = (long) MS_MIN(y1,MS_MIN(y2,MS_MIN(y3,y4)));
   maxx = (long) MS_MAX(x1,MS_MAX(x2,MS_MAX(x3,x4)));
   maxy = (long) MS_MAX(y1,MS_MAX(y2,MS_MAX(y3,y4)));

   width = (int)ceil(maxx-minx);
   height = (int)ceil(maxy-miny);

   /* create the new image based on the computed width/height */
   
   if (gdImageTrueColor(img)) {
      rimg = gdImageCreateTrueColor(width, height);
      gdImageAlphaBlending(rimg, 0);
      gdImageFilledRectangle(rimg, 0, 0, width, height, gdImageColorAllocateAlpha(rimg, 0, 0, 0, gdAlphaTransparent)); 
   } else {
      int tc = gdImageGetTransparent(img);
      rimg = gdImageCreate(width, height);  
      if(tc != -1)
         gdImageColorTransparent(rimg, gdImageColorAllocate(rimg, gdImageRed(img, tc), gdImageGreen(img, tc), gdImageBlue(img, tc)));
   }
   if(!rimg) {
      msSetError(MS_GDERR,"failed to create rotated pixmap","rotatePixmapGD()");
      return NULL;
   }

   gdImageCopyRotated (rimg, img, width*0.5, height*0.5, 0, 0, gdImageSX(img), gdImageSY(img), angle_rad*MS_RAD_TO_DEG);
   return rimg;
}

int renderPixmapSymbolGD(imageObj *img, double x, double y, symbolObj *symbol, symbolStyleObj *style) {
   gdImagePtr ip,pp;
   if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
   assert(symbol->pixmap_buffer && symbol->pixmap_buffer->type == MS_BUFFER_GD);
   pp = symbol->pixmap_buffer->data.gd_img;
   /* gdImageAlphaBlending(ip,1); */
   /* gdImageAlphaBlending(pp,1); */
      
   if(symbol->transparent)
      gdImageColorTransparent(pp,symbol->transparentcolor);
   if(style->scale == 1.0 && style->rotation == 0.0) { /* don't scale */
      x -= .5*symbol->pixmap_buffer->width;
      y -= .5*symbol->pixmap_buffer->height;
      gdImageCopy(ip, pp, x, y, 0, 0, symbol->pixmap_buffer->width,symbol->pixmap_buffer->height);
    } else {
       int bRotated = MS_FALSE;
       if(style->rotation) {
          bRotated = MS_TRUE;
          pp = rotatePixmapGD(pp,style->rotation);
       }
      x -=  .5*gdImageSX(pp)*style->scale;
      y -=  .5*gdImageSY(pp)*style->scale;
      gdImageCopyResampled(ip, pp, x, y, 0, 0,
            (int)(gdImageSX(pp) * style->scale),
            (int)(gdImageSY(pp) * style->scale),
            gdImageSX(pp),gdImageSY(pp));
      if(bRotated) {
         gdImageDestroy(pp);
      }
    }
   /* gdImageAlphaBlending(ip,0); */
   return MS_SUCCESS;
}

int renderTileGD(imageObj *img, imageObj *tile, double x, double y) {
  return MS_SUCCESS;
}

int renderPolygonTiledGD(imageObj *img, shapeObj *p,  imageObj *tile) 
{
  gdImagePtr ip, tp;

  if(!img || !p || !tile) return MS_FAILURE;
  if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
  if(!(tp = MS_IMAGE_GET_GDIMAGEPTR(tile))) return MS_FAILURE;
  gdImageColorTransparent(tp,0);
  gdImageSetTile(ip, tp);
  imageFilledPolygon(ip, p, gdTiled);
  return MS_SUCCESS;
}


int initializeRasterBufferGD(rasterBufferObj *rb, int width, int height, int mode) {
	rb->type = MS_BUFFER_GD;
	rb->data.gd_img = gdImageCreate(width, height);
	if(!rb->data.gd_img)
		return MS_FAILURE;
	rb->width = width;
	rb->height= height;
	return MS_SUCCESS;
}

/*
** GD driver-specific raster buffer functions.
*/
int getRasterBufferHandleGD(imageObj *img, rasterBufferObj *rb) {
	gdImagePtr gdImg = MS_IMAGE_GET_GDIMAGEPTR(img);
	rb->type = MS_BUFFER_GD;
	rb->data.gd_img = gdImg;
	rb->width = gdImg->sx;
	rb->height = gdImg->sy;
	return MS_SUCCESS;

}

int getRasterBufferCopyGD(imageObj *img, rasterBufferObj *rb) {
	gdImagePtr gdImg = MS_IMAGE_GET_GDIMAGEPTR(img);
	int row;
	rb->type = MS_BUFFER_GD;
	rb->width = gdImg->sx;
	rb->height = gdImg->sy;
	rb->data.gd_img = gdImageCreate(gdImg->sx,gdImg->sy);
	rb->data.gd_img->transparent = gdImg->transparent;
	gdImagePaletteCopy(rb->data.gd_img,gdImg);
	for(row=0;row<gdImg->sy;row++)
	   memcpy(rb->data.gd_img->pixels[row],gdImg->pixels[row],gdImg->sx);
	return MS_SUCCESS;
}

int mergeRasterBufferGD(imageObj *dest, rasterBufferObj *overlay, double opacity, int srcX, int srcY, int dstX, int dstY, int width, int height) {
	assert(dest && overlay);
	assert(overlay->type == MS_BUFFER_GD);
	gdImageCopyMerge(MS_IMAGE_GET_GDIMAGEPTR(dest),overlay->data.gd_img,dstX,dstY,srcX,srcY,width,height,opacity*100);
	return MS_SUCCESS;
}

int getTruetypeTextBBoxGD(rendererVTableObj *renderer, char **fonts, int numfonts, double size, char *string, rectObj *rect, double **advances, int bAdjustBaseline) {
   int bbox[8];
   char *error;
   if(advances) {
      char *s;
      int k;
      gdFTStringExtra strex;
      strex.flags = gdFTEX_XSHOW;
      error = gdImageStringFTEx(NULL, bbox, 0, fonts[0], size, 0, 0, 0, string, &strex);
      if(error) {
         msSetError(MS_TTFERR, error, "gdImageStringFTEx()");
         return(MS_FAILURE);
      }

      *advances = (double*)malloc( strlen(string) * sizeof(double) );
      MS_CHECK_ALLOC(*advances, strlen(string) * sizeof(double), MS_FAILURE);
      s = strex.xshow;
      k = 0;
      /* TODO this smells buggy and can cause errors at a higher level. strlen NOK here*/
      while ( *s && k < strlen(string) ) {
         (*advances)[k++] = atof(s);      
         while ( *s && *s != ' ')
            s++;
         if ( *s == ' ' )
            s++;
      }

      gdFree(strex.xshow); /* done with character advances */

      rect->minx = bbox[0];
      rect->miny = bbox[5];
      rect->maxx = bbox[2];
      rect->maxy = bbox[1];
      return MS_SUCCESS;
   } else {
      error = gdImageStringFT(NULL, bbox, 0, fonts[0], size, 0, 0, 0, string);
      if(error) {
         msSetError(MS_TTFERR, error, "msGetTruetypeTextBBox()");
         return(MS_FAILURE);
      }

      rect->minx = bbox[0];
      rect->miny = bbox[5];
      rect->maxx = bbox[2];
      rect->maxy = bbox[1];
      return MS_SUCCESS;
   }
}

int renderBitmapGlyphsGD(imageObj *img, double x, double y, labelStyleObj *style, char *text) {
   int size = MS_NINT(style->size);
   gdFontPtr fontPtr;
   gdImagePtr ip;
   int numlines=0,t;
   char **lines;
   if(!(ip = MS_IMAGE_GET_GDIMAGEPTR(img))) return MS_FAILURE;
   if(size<0 || size>4 || (fontPtr = msGetBitmapFont(size))==NULL) {
      msSetError(MS_RENDERERERR,"invalid bitmap font size", "renderBitmapGlyphsGD()");
      return MS_FAILURE;
   }
   
   SETPEN(ip, style->color);
   SETPEN(ip, style->outlinecolor);
   
   if(msCountChars(text,'\n')) {
      if((lines = msStringSplit((const char*)text, '\n', &(numlines))) == NULL)
         return(-1);
   } else {
      lines = &text;
      numlines = 1;
   }

   y -= fontPtr->h;
   for(t=0; t<numlines; t++) {
      if(style->outlinewidth > 0) {
         gdImageString(ip, fontPtr, x, y-1,   (unsigned char *) lines[t], style->outlinecolor->pen);
         gdImageString(ip, fontPtr, x, y+1,   (unsigned char *) lines[t], style->outlinecolor->pen);
         gdImageString(ip, fontPtr, x+1, y,   (unsigned char *) lines[t], style->outlinecolor->pen);
         gdImageString(ip, fontPtr, x-1, y,   (unsigned char *) lines[t], style->outlinecolor->pen);
         gdImageString(ip, fontPtr, x+1, y-1, (unsigned char *) lines[t], style->outlinecolor->pen);
         gdImageString(ip, fontPtr, x+1, y+1, (unsigned char *) lines[t], style->outlinecolor->pen);
         gdImageString(ip, fontPtr, x-1, y-1, (unsigned char *) lines[t], style->outlinecolor->pen);
         gdImageString(ip, fontPtr, x-1, y+1, (unsigned char *) lines[t], style->outlinecolor->pen);
      }
      if(style->color->pen != -1) {
         gdImageString(ip, fontPtr, x, y, (unsigned char *) lines[t], style->color->pen);
      }

      y += fontPtr->h; /* shift down */
   }


   if(*lines != text)
      msFreeCharArray(lines, numlines);
   return MS_SUCCESS;
}

/*
** Misc. cleanup functions for GD driver.
*/

int freeSymbolGD(symbolObj *s) {
  return MS_SUCCESS;
}
#endif

int msPopulateRendererVTableGD( rendererVTableObj *renderer ) {
#ifdef USE_GD
  int i;
  renderer->use_imagecache=0;
  renderer->supports_pixel_buffer=1;
  renderer->supports_transparent_layers = 0;
  renderer->supports_bitmap_fonts = 1;
  renderer->default_transform_mode = MS_TRANSFORM_ROUND;
  
  for(i=0;i<5;i++) {
     gdFontPtr f = msGetBitmapFont(i);
     bitmapFontMetricsGD[i].charWidth = f->w;
     bitmapFontMetricsGD[i].charHeight = f->h;
     renderer->bitmapFontMetrics[i] = &bitmapFontMetricsGD[i];
  }
    
  
  renderer->startLayer = startNewLayerGD;
  renderer->endLayer = closeNewLayerGD;
  renderer->renderLineTiled = NULL;
  renderer->renderLine = &renderLineGD;
  renderer->createImage = &createImageGD;
  renderer->saveImage = &saveImageGD;
  renderer->getRasterBufferHandle = &getRasterBufferHandleGD;
  renderer->getRasterBufferCopy = &getRasterBufferCopyGD;
  renderer->initializeRasterBuffer = initializeRasterBufferGD;
  renderer->loadImageFromFile = msLoadGDRasterBufferFromFile;
  renderer->renderPolygon = &renderPolygonGD;
  renderer->renderGlyphs = &renderGlyphsGD;
  renderer->renderBitmapGlyphs = &renderBitmapGlyphsGD;
  renderer->freeImage = &freeImageGD;
  renderer->renderEllipseSymbol = &renderEllipseSymbolGD;
  renderer->renderVectorSymbol = &renderVectorSymbolGD;
  renderer->renderTruetypeSymbol = &renderTruetypeSymbolGD;
  renderer->renderPixmapSymbol = &renderPixmapSymbolGD;
  renderer->mergeRasterBuffer = &mergeRasterBufferGD;
  renderer->getTruetypeTextBBox = &getTruetypeTextBBoxGD;
  renderer->renderTile = &renderTileGD;
  renderer->renderPolygonTiled = &renderPolygonTiledGD;
  renderer->freeSymbol = &freeSymbolGD;
  return MS_SUCCESS;
#else
  msSetError(MS_MISCERR,"GD renderer requested but it is not configured in this build","msPopulateRendererVtableGD()");
  return MS_FAILURE;
#endif
}