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+/* ImageConverter.java -- Loads images asynchronously
+   Copyright (C) 2008 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.awt.image;
+
+import gnu.java.awt.image.AsyncImage;
+
+import java.awt.GraphicsEnvironment;
+import java.awt.Image;
+import java.awt.Transparency;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorModel;
+import java.awt.image.DataBuffer;
+import java.awt.image.ImageConsumer;
+import java.awt.image.IndexColorModel;
+import java.awt.image.ImageObserver;
+import java.awt.image.SinglePixelPackedSampleModel;
+import java.awt.image.WritableRaster;
+import java.util.Hashtable;
+
+/**
+ * Convert an Image to a BufferedImage.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public class ImageConverter implements ImageConsumer
+{
+
+  public static final String IMAGE_TRANSPARENCY_PROPERTY =
+    "gnu.awt.image.transparency";
+
+  public static final String IMAGE_PROPERTIES_PROPERTY =
+    "gnu.awt.image.properties";
+
+  private AsyncImage image;
+  private BufferedImage bImage;
+  private Hashtable imageProperties;
+  private int width, height;
+  private ColorModel colorModel;
+  private ColorModel targetColorModel;
+
+  public ImageConverter()
+  {
+    width = 0;
+    height = 0;
+    image = new AsyncImage();
+  }
+
+  public void setDimensions(int w, int h)
+  {
+    width = w;
+    height = h;
+  }
+
+  public void setProperties(Hashtable props)
+  {
+    // Ignore for now.
+  }
+
+  public void setColorModel(ColorModel model)
+  {
+    colorModel = model;
+  }
+
+  public void setHints(int flags)
+  {
+    // Ignore for now.
+  }
+
+  public void setPixels(int x, int y, int w, int h, ColorModel model,
+                        byte[] pixels, int offset, int scansize)
+  {
+    model = setupColorModel(model);
+
+    if (bImage == null)
+      {
+        createImage();
+      }
+
+    Integer t = (Integer) imageProperties.get("gnu.awt.image.transparency");
+    int transparency = t.intValue();
+
+    if(targetColorModel.equals(model))
+      {
+        transparency = transferPixels(x, y, w, h, model, pixels, offset,
+                                      scansize, transparency);
+      }
+    else if (model instanceof IndexColorModel
+             && targetColorModel.equals(ColorModel.getRGBdefault()))
+      {
+        transparency = convertIndexColorModelToSRGB(x, y, w, h,
+                                                    (IndexColorModel) model,
+                                                    pixels, offset, scansize,
+                                                    transparency);
+      }
+    else
+      {
+        transparency = convertPixels(x, y, w, h, model, pixels, offset,
+                                     scansize, transparency);
+      }
+
+    imageProperties.put("gnu.awt.image.transparency",
+                        Integer.valueOf(transparency));
+  }
+
+  public void setPixels(int x, int y, int w, int h, ColorModel model,
+                        int[] pixels, int offset, int scansize)
+  {
+    model = setupColorModel(model);
+    if (bImage == null)
+      {
+        createImage();
+      }
+
+    Integer t = (Integer) imageProperties.get(IMAGE_TRANSPARENCY_PROPERTY);
+    int transparency= t.intValue();
+
+    if (targetColorModel.equals(model))
+      {
+        transparency = transferPixels(x, y, w, h, model, pixels, offset,
+                                      scansize, transparency);
+      }
+    else if (model instanceof IndexColorModel
+             && targetColorModel.equals(ColorModel.getRGBdefault()))
+      {
+        transparency = convertIndexColorModelToSRGB(x, y, w, h,
+                                                    (IndexColorModel) model,
+                                                    pixels, offset, scansize,
+                                                    transparency);
+      }
+    else
+      {
+        transparency = convertPixels(x, y, w, h, model, pixels, offset,
+                                     scansize, transparency);
+      }
+
+    imageProperties.put(IMAGE_TRANSPARENCY_PROPERTY,
+                        Integer.valueOf(transparency));
+
+  }
+
+  /**
+   * Initialize the color model for this setPixels run: <br/>
+   * 1. if no color model was given use the hinted color model <br/>
+   * 2. if no color model was given and non was hinted use the default sRGB color model. <br/>
+   * Also:<br/>
+   * If no target color model was set use the color model of the given pixels.
+   * @param model
+   * @return
+   */
+  private ColorModel setupColorModel(ColorModel model)
+  {
+    // If the given color model is null use the previously hinted color model.
+    if (model == null)
+      model = colorModel;
+
+    // If no color model was given or hinted use default sRGB.
+    if (model == null)
+      model = ColorModel.getRGBdefault();
+
+    // If no specific color model was requested for the target use the current
+    // pixels model.
+    if (targetColorModel == null)
+      targetColorModel = model;
+    targetColorModel = ColorModel.getRGBdefault();
+    return model;
+  }
+
+  /**
+   * Creates the image instance into which the pixel data is converted.
+   */
+  private void createImage()
+  {
+    if (imageProperties == null)
+      {
+        imageProperties = new Hashtable();
+      }
+
+    imageProperties.put(IMAGE_TRANSPARENCY_PROPERTY,
+                        Integer.valueOf(Transparency.OPAQUE));
+    imageProperties.put(IMAGE_PROPERTIES_PROPERTY, imageProperties);
+
+    // For the sRGB case let the GraphicsEnvironment create an image for us.
+    if (ColorModel.getRGBdefault().equals(targetColorModel))
+      {
+        bImage = GraphicsEnvironment.getLocalGraphicsEnvironment()
+                                    .getDefaultScreenDevice()
+                                    .getDefaultConfiguration()
+             .createCompatibleImage(width, height, Transparency.TRANSLUCENT);
+      }
+    else
+      {
+        WritableRaster raster =
+          targetColorModel.createCompatibleWritableRaster(width, height);
+        bImage = new BufferedImage(targetColorModel, raster, false,
+                                   imageProperties);
+      }
+    image.setRealImage(bImage);
+    return;
+  }
+
+  /**
+   * Transfers pixels into a raster of the same color model.
+   *
+   * @param x the X coordinate of the source pixel rectangle
+   * @param y the Y coordinate of the source pixel rectangle
+   * @param w the width of the source pixel rectangle
+   * @param h the height of the source pixel rectangle
+   * @param model the color model of the source pixels
+   * @param pixels the pixel data
+   * @param offset the offset in the pixel array
+   * @param scansize the scanline size
+   * @param transparency the assumed transparency
+   *
+   * @return the determined transparency
+   */
+  private int transferPixels(int x, int y, int w, int h, ColorModel model,
+                             byte[] pixels, int offset, int scansize,
+                             int transparency)
+  {
+    // If we have the same color model, then we can simply drop
+    // the pixel value into the target raster.
+    bImage.getRaster().setDataElements(x, y, w, h, pixels);
+
+    for (int yy = 0; yy < h; yy++)
+      {
+        for (int xx = 0; xx < w; xx++)
+          {
+            int pixel = 0xFF & pixels[yy * scansize + xx + offset];
+            int alpha = model.getAlpha(pixel);
+            transparency = updateTransparency(alpha, transparency);
+          }
+      }
+    return transparency;
+  }
+
+  /**
+   * Transfers pixels into a raster of the same color model.
+   *
+   * @param x the X coordinate of the source pixel rectangle
+   * @param y the Y coordinate of the source pixel rectangle
+   * @param w the width of the source pixel rectangle
+   * @param h the height of the source pixel rectangle
+   * @param model the color model of the source pixels
+   * @param pixels the pixel data
+   * @param offset the offset in the pixel array
+   * @param scansize the scanline size
+   * @param transparency the assumed transparency
+   *
+   * @return the determined transparency
+   */
+  private int transferPixels(int x, int y, int w, int h, ColorModel model,
+                             int[] pixels, int offset, int scansize,
+                             int transparency)
+  {
+    // If we have the same color model, then we can simply drop
+    // the pixel value into the target raster.
+    bImage.getRaster().setDataElements(x, y, w, h, pixels);
+
+    for (int yy = 0; yy < h; yy++)
+      {
+        for (int xx = 0; xx < w; xx++)
+          {
+            int pixel = pixels[yy * scansize + xx + offset];
+            int alpha = model.getAlpha(pixel);
+            transparency = updateTransparency(alpha, transparency);
+          }
+      }
+    return transparency;
+  }
+
+  /**
+   * Converts pixel from one color model to another, and stores them in the
+   * target image.
+   *
+   * @param x the X coordinate of the source pixel rectangle
+   * @param y the Y coordinate of the source pixel rectangle
+   * @param w the width of the source pixel rectangle
+   * @param h the height of the source pixel rectangle
+   * @param model the color model of the source pixels
+   * @param pixels the pixel data
+   * @param offset the offset in the pixel array
+   * @param scansize the scanline size
+   * @param transparency the assumed transparency
+   *
+   * @return the determined transparency
+   */
+  private int convertPixels(int x, int y, int w, int h, ColorModel model,
+                            byte[] pixels, int offset, int scansize,
+                            int transparency)
+  {
+    // If the color models are not the same, we must convert the
+    // pixel values from one model to the other.
+    Object dataEl = null;
+    // Convert pixels to the destination color model.
+    for (int yy = 0; yy < h; yy++)
+      {
+        for (int xx = 0; xx < w; xx++)
+          {
+            int pixel = 0xFF & pixels[yy * scansize + xx + offset];
+            int rgb = model.getRGB(pixel);
+            int alpha = model.getAlpha(pixel);
+            transparency = updateTransparency(alpha, transparency);
+            dataEl = targetColorModel.getDataElements(rgb, dataEl);
+            bImage.getRaster().setDataElements(x + xx, y + yy, dataEl);
+          }
+      }
+    return transparency;
+  }
+
+  /**
+   * Converts pixel from one color model to another, and stores them in the
+   * target image.
+   *
+   * @param x the X coordinate of the source pixel rectangle
+   * @param y the Y coordinate of the source pixel rectangle
+   * @param w the width of the source pixel rectangle
+   * @param h the height of the source pixel rectangle
+   * @param model the color model of the source pixels
+   * @param pixels the pixel data
+   * @param offset the offset in the pixel array
+   * @param scansize the scanline size
+   * @param transparency the assumed transparency
+   *
+   * @return the determined transparency
+   */
+  private int convertPixels(int x, int y, int w, int h, ColorModel model,
+                            int[] pixels, int offset, int scansize,
+                            int transparency)
+  {
+    // If the color models are not the same, we must convert the
+    // pixel values from one model to the other.
+    Object dataEl = null;
+    // Convert pixels to the destination color model.
+    for (int yy = 0; yy < h; yy++)
+      {
+        for (int xx = 0; xx < w; xx++)
+          {
+            int pixel = pixels[yy * scansize + xx + offset];
+            int rgb = model.getRGB(pixel);
+            int alpha = model.getAlpha(pixel);
+            transparency = updateTransparency(alpha, transparency);
+            dataEl = targetColorModel.getDataElements(rgb, dataEl);
+            bImage.getRaster().setDataElements(x + xx, y + yy, dataEl);
+          }
+      }
+    return transparency;
+  }
+
+  /**
+   * Converts pixels from an index color model to the target image.
+   *
+   * @param x the X coordinate of the source pixel rectangle
+   * @param y the Y coordinate of the source pixel rectangle
+   * @param w the width of the source pixel rectangle
+   * @param h the height of the source pixel rectangle
+   * @param model the color model of the source pixels
+   * @param pixels the pixel data
+   * @param offset the offset in the pixel array
+   * @param scansize the scanline size
+   * @param transparency the assumed transparency
+   *
+   * @return the determined transparency
+   */
+  private int convertIndexColorModelToSRGB(int x, int y, int w, int h,
+                                           IndexColorModel model,
+                                           byte[] pixels, int offset,
+                                           int scansize, int transparency)
+  {
+
+    int mapSize = model.getMapSize();
+    int[] colorMap = new int[mapSize];
+    for(int i=0; i < mapSize; i++)
+      {
+        colorMap[i] = model.getRGB(i);
+      }
+
+    WritableRaster raster = bImage.getRaster();
+    SinglePixelPackedSampleModel sampleMode =
+      (SinglePixelPackedSampleModel) raster.getSampleModel();
+    DataBuffer dataBuffer = (DataBuffer) raster.getDataBuffer();
+
+    int rasterOffset = sampleMode.getOffset(x,y)+dataBuffer.getOffset();
+    int rasterScanline = sampleMode.getScanlineStride();
+
+    for (int yy = 0; yy < h; yy++)
+      {
+        int xoffset = offset;
+        for (int xx = 0; xx < w; xx++)
+          {
+            int argb  = colorMap[(pixels[xoffset++] & 0xFF)];
+            dataBuffer.setElem(rasterOffset+xx, argb);
+            int alpha = (argb >>> 24);
+            transparency = updateTransparency(alpha, transparency);
+          }
+        offset += scansize;
+        rasterOffset += rasterScanline;
+      }
+
+    return transparency;
+  }
+
+  /**
+   * Converts pixels from an index color model to the target image.
+   *
+   * @param x the X coordinate of the source pixel rectangle
+   * @param y the Y coordinate of the source pixel rectangle
+   * @param w the width of the source pixel rectangle
+   * @param h the height of the source pixel rectangle
+   * @param model the color model of the source pixels
+   * @param pixels the pixel data
+   * @param offset the offset in the pixel array
+   * @param scansize the scanline size
+   * @param transparency the assumed transparency
+   *
+   * @return the determined transparency
+   */
+  private int convertIndexColorModelToSRGB(int x, int y, int w, int h,
+                                           IndexColorModel model, int[] pixels,
+                                           int offset, int scansize,
+                                           int transparency)
+  {
+    int mapSize = model.getMapSize();
+    int[] colorMap = new int[mapSize];
+    for(int i=0; i < mapSize; i++)
+      {
+        colorMap[i] = model.getRGB(i);
+      }
+
+    WritableRaster raster = bImage.getRaster();
+    SinglePixelPackedSampleModel sampleMode =
+      (SinglePixelPackedSampleModel) raster.getSampleModel();
+    DataBuffer dataBuffer = (DataBuffer)raster.getDataBuffer();
+
+    int rasterOffset = sampleMode.getOffset(x, y) + dataBuffer.getOffset();
+    int rasterScanline = sampleMode.getScanlineStride();
+
+    for (int yy = 0; yy < h; yy++)
+      {
+        int xoffset = offset;
+        for (int xx = 0; xx < w; xx++)
+          {
+            int argb  = colorMap[pixels[xoffset++]];
+            dataBuffer.setElem(rasterOffset + xx, argb);
+            int alpha = (argb >>> 24);
+            transparency = updateTransparency(alpha, transparency);
+          }
+        offset += scansize;
+        rasterOffset += rasterScanline;
+      }
+
+    return transparency;
+  }
+
+  /**
+   * Updates the transparency information according to the alpha pixel value.
+   *
+   * @param alpha the alpha pixel value
+   * @param transparency the old transparency
+   *
+   * @return the updated transparency
+   */
+  private int updateTransparency(int alpha, int transparency)
+  {
+    if (alpha != 0xFF)
+      {
+        if (alpha == 0x00 && transparency <= Transparency.BITMASK)
+          {
+            transparency = Transparency.BITMASK;
+          }
+        else if (transparency < Transparency.TRANSLUCENT)
+          {
+            transparency = Transparency.TRANSLUCENT;
+          }
+      }
+    return transparency;
+  }
+
+  public void imageComplete(int status)
+  {
+    image.notifyObservers(ImageObserver.ALLBITS, 0, 0, width, height);
+  }
+
+  public void setTargetColorModel(ColorModel model)
+  {
+    targetColorModel = model;
+  }
+
+  public Image getImage()
+  {
+    return image;
+  }
+}