Example #1
0
 /**
  * Turn a (possibly) translucent or indexed image into a display-compatible bitmask image using
  * the given alpha threshold and render-to-background colour, or display-compatible translucent
  * image. The alpha values in the image are set to either 0 (below threshold) or 255 (above
  * threshold). The render-to-background colour bg_col is used to determine how the pixels
  * overlapping transparent pixels should be rendered. The fast algorithm just sets the colour
  * behind the transparent pixels in the image (for bitmask source images); the slow algorithm
  * actually renders the image to a background of bg_col (for translucent sources).
  *
  * @param thresh alpha threshold between 0 and 255
  * @param fast use fast algorithm (only set bg_col behind transp. pixels)
  * @param bitmask true=use bitmask, false=use translucent
  */
 public JGImage toDisplayCompatible(int thresh, JGColor bg_col, boolean fast, boolean bitmask) {
   Color bgcol = new Color(bg_col.r, bg_col.g, bg_col.b);
   int bgcol_rgb = (bgcol.getRed() << 16) | (bgcol.getGreen() << 8) | bgcol.getBlue();
   JGPoint size = getSize();
   int[] buffer = getPixels();
   // render image to bg depending on bgcol
   BufferedImage img_bg;
   if (bitmask) {
     img_bg = createCompatibleImage(size.x, size.y, Transparency.BITMASK);
   } else {
     img_bg = createCompatibleImage(size.x, size.y, Transparency.TRANSLUCENT);
   }
   int[] bg_buf;
   if (!fast) {
     Graphics g = img_bg.getGraphics();
     g.setColor(bgcol);
     // the docs say I could use bgcol in the drawImage as an
     // equivalent to the following two lines, but this
     // doesn't handle translucency properly and is _slower_
     g.fillRect(0, 0, size.x, size.y);
     g.drawImage(img, 0, 0, null);
     bg_buf = new JREImage(img_bg).getPixels();
   } else {
     bg_buf = buffer;
   }
   // g.dispose();
   // ColorModel rgb_bitmask = ColorModel.getRGBdefault();
   // rgb_bitmask = new PackedColorModel(
   //		rgb_bitmask.getColorSpace(),25,0xff0000,0x00ff00,0x0000ff,
   //		0x1000000, false, Transparency.BITMASK, DataBuffer.TYPE_INT);
   //		ColorSpace space, int bits, int rmask, int gmask, int bmask, int amask, boolean
   // isAlphaPremultiplied, int trans, int transferType)
   int[] thrsbuf = new int[size.x * size.y];
   for (int y = 0; y < size.y; y++) {
     for (int x = 0; x < size.x; x++) {
       if (((buffer[y * size.x + x] >> 24) & 0xff) >= thresh) {
         thrsbuf[y * size.x + x] = bg_buf[y * size.x + x] | (0xff << 24);
       } else {
         // explicitly set the colour of the transparent pixel.
         // This makes a difference when scaling!
         // thrsbuf[y*size.x+x]=bg_buf[y*size.x+x]&~(0xff<<24);
         thrsbuf[y * size.x + x] = bgcol_rgb;
       }
     }
   }
   return new JREImage(
       output_comp.createImage(
           new MemoryImageSource(
               size.x,
               size.y,
               // rgb_bitmask,
               img_bg.getColorModel(), // display compatible bitmask
               bitmask ? thrsbuf : bg_buf,
               0,
               size.x)));
 }
    private Color getColor(Element shape) {
      Color color;
      if (shape.hasAttribute(ATR_COLOUR)) {
        String s = shape.getAttribute(ATR_COLOUR);
        if (s.indexOf(',') > -1) {
          String[] rgb = s.split(",");
          color =
              new Color(
                  Integer.parseInt(rgb[0]), Integer.parseInt(rgb[1]), Integer.parseInt(rgb[2]));
        } else {
          color = new Color(Integer.parseInt(s));
        }
      } else color = IMPLIED_COLOR;

      if (shape.hasAttribute(ATR_TRANSPARENCY)) {
        int alpha = Integer.parseInt(shape.getAttribute(ATR_TRANSPARENCY));
        if (alpha < 255) return new Color(color.getRed(), color.getGreen(), color.getBlue(), alpha);
      }

      return color;
    }