59         this.maxTileAlphaSum = TILE_SIZE*TILE_SIZE*maxalpha;
  60     }
  61 
  62     private static byte[] buildAlphaMap(int maxalpha) {
  63         byte[] alMap = new byte[maxalpha+1];
  64         int halfmaxalpha = maxalpha>>2;
  65         for (int i = 0; i <= maxalpha; i++) {
  66             alMap[i] = (byte) ((i * 255 + halfmaxalpha) / maxalpha);
  67         }
  68         return alMap;
  69     }
  70 
  71     public static byte[] getAlphaMap(int maxalpha) {
  72         if (!alphaMapsCache.containsKey(maxalpha)) {
  73             alphaMapsCache.put(maxalpha, buildAlphaMap(maxalpha));
  74         }
  75         return alphaMapsCache.get(maxalpha);
  76     }
  77 
  78     public void getBbox(int bbox[]) {
  79         cache.getBBox(bbox);



  80         //System.out.println("bbox["+bbox[0]+", "+bbox[1]+" => "+bbox[2]+", "+bbox[3]+"]");
  81     }
  82 
  83     /**
  84      * Gets the width of the tiles that the generator batches output into.
  85      * @return the width of the standard alpha tile
  86      */
  87     public int getTileWidth() {
  88         return TILE_SIZE;
  89     }
  90 
  91     /**
  92      * Gets the height of the tiles that the generator batches output into.
  93      * @return the height of the standard alpha tile
  94      */
  95     public int getTileHeight() {
  96         return TILE_SIZE;
  97     }
  98 
  99     /**

  59         this.maxTileAlphaSum = TILE_SIZE*TILE_SIZE*maxalpha;
  60     }
  61 
  62     private static byte[] buildAlphaMap(int maxalpha) {
  63         byte[] alMap = new byte[maxalpha+1];
  64         int halfmaxalpha = maxalpha>>2;
  65         for (int i = 0; i <= maxalpha; i++) {
  66             alMap[i] = (byte) ((i * 255 + halfmaxalpha) / maxalpha);
  67         }
  68         return alMap;
  69     }
  70 
  71     public static byte[] getAlphaMap(int maxalpha) {
  72         if (!alphaMapsCache.containsKey(maxalpha)) {
  73             alphaMapsCache.put(maxalpha, buildAlphaMap(maxalpha));
  74         }
  75         return alphaMapsCache.get(maxalpha);
  76     }
  77 
  78     public void getBbox(int bbox[]) {
  79         bbox[0] = cache.bboxX0;
  80         bbox[1] = cache.bboxY0;
  81         bbox[2] = cache.bboxX1;
  82         bbox[3] = cache.bboxY1;
  83         //System.out.println("bbox["+bbox[0]+", "+bbox[1]+" => "+bbox[2]+", "+bbox[3]+"]");
  84     }
  85 
  86     /**
  87      * Gets the width of the tiles that the generator batches output into.
  88      * @return the width of the standard alpha tile
  89      */
  90     public int getTileWidth() {
  91         return TILE_SIZE;
  92     }
  93 
  94     /**
  95      * Gets the height of the tiles that the generator batches output into.
  96      * @return the height of the standard alpha tile
  97      */
  98     public int getTileHeight() {
  99         return TILE_SIZE;
 100     }
 101 
 102     /**