Пример #1
0
  /**
   * Paint the image onto a Graphics object. The painting is performed tile-by-tile, and includes a
   * grey region covering the unused portion of image tiles as well as the general background. At
   * this point the image must be byte data.
   */
  public synchronized void paintComponent(Graphics g) {

    Graphics2D g2D = null;
    if (g instanceof Graphics2D) {
      g2D = (Graphics2D) g;
    } else {
      return;
    }

    // if source is null, it's just a component
    if (source == null) {
      g2D.setColor(getBackground());
      g2D.fillRect(0, 0, componentWidth, componentHeight);
      return;
    }

    int transX = -originX;
    int transY = -originY;

    // Get the clipping rectangle and translate it into image coordinates.
    Rectangle clipBounds = g.getClipBounds();

    if (clipBounds == null) {
      clipBounds = new Rectangle(0, 0, componentWidth, componentHeight);
    }

    // clear the background (clip it) [minimal optimization here]
    if (transX > 0
        || transY > 0
        || transX < (componentWidth - source.getWidth())
        || transY < (componentHeight - source.getHeight())) {
      g2D.setColor(getBackground());
      g2D.fillRect(0, 0, componentWidth, componentHeight);
    }

    clipBounds.translate(-transX, -transY);

    // Determine the extent of the clipping region in tile coordinates.
    int txmin, txmax, tymin, tymax;
    int ti, tj;

    txmin = XtoTileX(clipBounds.x);
    txmin = Math.max(txmin, minTileX);
    txmin = Math.min(txmin, maxTileX);

    txmax = XtoTileX(clipBounds.x + clipBounds.width - 1);
    txmax = Math.max(txmax, minTileX);
    txmax = Math.min(txmax, maxTileX);

    tymin = YtoTileY(clipBounds.y);
    tymin = Math.max(tymin, minTileY);
    tymin = Math.min(tymin, maxTileY);

    tymax = YtoTileY(clipBounds.y + clipBounds.height - 1);
    tymax = Math.max(tymax, minTileY);
    tymax = Math.min(tymax, maxTileY);
    Insets insets = getInsets();

    // Loop over tiles within the clipping region
    for (tj = tymin; tj <= tymax; tj++) {
      for (ti = txmin; ti <= txmax; ti++) {
        int tx = TileXtoX(ti);
        int ty = TileYtoY(tj);

        Raster tile = source.getTile(ti, tj);
        if (tile != null) {
          DataBuffer dataBuffer = tile.getDataBuffer();

          WritableRaster wr = tile.createWritableRaster(sampleModel, dataBuffer, null);

          BufferedImage bi =
              new BufferedImage(colorModel, wr, colorModel.isAlphaPremultiplied(), null);

          // correctly handles band offsets
          if (brightnessEnabled == true) {
            SampleModel sm =
                sampleModel.createCompatibleSampleModel(tile.getWidth(), tile.getHeight());

            WritableRaster raster = RasterFactory.createWritableRaster(sm, null);

            BufferedImage bimg =
                new BufferedImage(colorModel, raster, colorModel.isAlphaPremultiplied(), null);

            // don't move this code
            ByteLookupTable lutTable = new ByteLookupTable(0, lutData);
            LookupOp lookup = new LookupOp(lutTable, null);
            lookup.filter(bi, bimg);

            g2D.drawImage(bimg, biop, tx + transX + insets.left, ty + transY + insets.top);
          } else {
            AffineTransform transform;

            transform =
                AffineTransform.getTranslateInstance(
                    tx + transX + insets.left, ty + transY + insets.top);

            g2D.drawRenderedImage(bi, transform);
          }
        }
      }
    }
  }
Пример #2
0
  public BufferedImage read(int imageIndex, ImageReadParam param) throws IOException {
    checkIndex(imageIndex);
    readHeader();

    if (iis == null) throw new IllegalStateException("input is null");

    BufferedImage img;

    clearAbortRequest();
    processImageStarted(imageIndex);

    if (param == null) param = getDefaultReadParam();

    sourceRegion = new Rectangle(0, 0, 0, 0);
    destinationRegion = new Rectangle(0, 0, 0, 0);

    computeRegions(
        param, this.width, this.height, param.getDestination(), sourceRegion, destinationRegion);

    scaleX = param.getSourceXSubsampling();
    scaleY = param.getSourceYSubsampling();

    // If the destination band is set used it
    sourceBands = param.getSourceBands();
    destBands = param.getDestinationBands();

    seleBand = (sourceBands != null) && (destBands != null);
    noTransform = destinationRegion.equals(new Rectangle(0, 0, width, height)) || seleBand;

    if (!seleBand) {
      sourceBands = new int[colorPlanes];
      destBands = new int[colorPlanes];
      for (int i = 0; i < colorPlanes; i++) destBands[i] = sourceBands[i] = i;
    }

    // If the destination is provided, then use it.  Otherwise, create new one
    bi = param.getDestination();

    // Get the image data.
    WritableRaster raster = null;

    if (bi == null) {
      if (sampleModel != null && colorModel != null) {
        sampleModel =
            sampleModel.createCompatibleSampleModel(
                destinationRegion.width + destinationRegion.x,
                destinationRegion.height + destinationRegion.y);
        if (seleBand) sampleModel = sampleModel.createSubsetSampleModel(sourceBands);
        raster = Raster.createWritableRaster(sampleModel, new Point(0, 0));
        bi = new BufferedImage(colorModel, raster, false, null);
      }
    } else {
      raster = bi.getWritableTile(0, 0);
      sampleModel = bi.getSampleModel();
      colorModel = bi.getColorModel();

      noTransform &= destinationRegion.equals(raster.getBounds());
    }

    byte bdata[] = null; // buffer for byte data

    if (sampleModel.getDataType() == DataBuffer.TYPE_BYTE)
      bdata = (byte[]) ((DataBufferByte) raster.getDataBuffer()).getData();

    readImage(bdata);

    if (abortRequested()) processReadAborted();
    else processImageComplete();

    return bi;
  }