Initital check-in of the ImageIO GIFImageWriter codec

src/helma/image/imageio/gif/GIFImageWriteParam.java

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+/*
+ * Helma License Notice
+ *
+ * The contents of this file are subject to the Helma License
+ * Version 2.0 (the "License"). You may not use this file except in
+ * compliance with the License. A copy of the License is available at
+ * http://adele.helma.org/download/helma/license.txt
+ *
+ * Copyright 1998-2003 Helma Software. All Rights Reserved.
+ *
+ * $RCSfile$
+ * $Author$
+ * $Revision$
+ * $Date$
+ */
+
+/*
+ * The imageio integration is inspired by the package org.freehep.graphicsio.gif
+ */
+
+package helma.image.imageio.gif;
+
+import java.util.*;
+import javax.imageio.*;
+
+public class GIFImageWriteParam extends ImageWriteParam {
+
+    private boolean quantizeColors;
+    private String quantizeMode;
+
+    public GIFImageWriteParam(Locale locale) {
+        super(locale);
+        canWriteProgressive = true;
+        progressiveMode = MODE_DEFAULT;
+    }
+
+    public ImageWriteParam getWriteParam(Properties properties) {
+        return this;
+    }
+}

src/helma/image/imageio/gif/GIFImageWriter.java

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+/*
+ * Helma License Notice
+ *
+ * The contents of this file are subject to the Helma License
+ * Version 2.0 (the "License"). You may not use this file except in
+ * compliance with the License. A copy of the License is available at
+ * http://adele.helma.org/download/helma/license.txt
+ *
+ * Copyright 1998-2003 Helma Software. All Rights Reserved.
+ *
+ * $RCSfile$
+ * $Author$
+ * $Revision$
+ * $Date$
+ */
+
+/*
+ * The imageio integration is inspired by the package org.freehep.graphicsio.gif
+ */
+
+package helma.image.imageio.gif;
+
+import java.awt.image.*;
+import java.io.*;
+import javax.imageio.*;
+import javax.imageio.metadata.*;
+
+import helma.image.*;
+
+public class GIFImageWriter extends ImageWriter {
+    GIFEncoder encoder;
+
+    public GIFImageWriter(GIFImageWriterSpi originatingProvider) {
+        super(originatingProvider);
+        encoder = new GIFEncoder();
+    }
+
+    public void write(IIOMetadata streamMetadata, IIOImage image,
+        ImageWriteParam param) throws IOException {
+        if (image == null)
+            throw new IllegalArgumentException("image == null");
+
+        if (image.hasRaster())
+            throw new UnsupportedOperationException("Cannot write rasters");
+
+        Object output = getOutput();
+        if (output == null)
+            throw new IllegalStateException("output was not set");
+
+        if (param == null)
+            param = getDefaultWriteParam();
+
+        RenderedImage ri = image.getRenderedImage();
+        if (!(ri instanceof BufferedImage))
+            throw new IOException("RenderedImage is not a BufferedImage");
+        if (!(output instanceof DataOutput))
+            throw new IOException("output is not a DataOutput");
+        encoder.encode((BufferedImage) ri, (DataOutput) output,
+            param.getProgressiveMode() != ImageWriteParam.MODE_DISABLED, null);
+    }
+
+    public IIOMetadata convertStreamMetadata(IIOMetadata inData,
+        ImageWriteParam param) {
+        return null;
+    }
+
+    public IIOMetadata convertImageMetadata(IIOMetadata inData,
+        ImageTypeSpecifier imageType, ImageWriteParam param) {
+        return null;
+    }
+
+    public IIOMetadata getDefaultImageMetadata(ImageTypeSpecifier imageType,
+        ImageWriteParam param) {
+        return null;
+    }
+
+    public IIOMetadata getDefaultStreamMetadata(ImageWriteParam param) {
+        return null;
+    }
+
+    public ImageWriteParam getDefaultWriteParam() {
+        return new GIFImageWriteParam(getLocale());
+    }
+}

src/helma/image/imageio/gif/GIFImageWriterSpi.java

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+/*
+ * Helma License Notice
+ *
+ * The contents of this file are subject to the Helma License
+ * Version 2.0 (the "License"). You may not use this file except in
+ * compliance with the License. A copy of the License is available at
+ * http://adele.helma.org/download/helma/license.txt
+ *
+ * Copyright 1998-2003 Helma Software. All Rights Reserved.
+ *
+ * $RCSfile$
+ * $Author$
+ * $Revision$
+ * $Date$
+ */
+
+/*
+ * The imageio integration is inspired by the package org.freehep.graphicsio.gif
+ */
+
+package helma.image.imageio.gif;
+
+import java.io.*;
+import java.util.*;
+import javax.imageio.*;
+import javax.imageio.spi.*;
+
+public class GIFImageWriterSpi extends ImageWriterSpi {
+	
+    public GIFImageWriterSpi() {
+        super(
+            "Helma Object Publisher, http://helma.org/",
+            "1.0",
+            new String[] {"gif", "GIF"},
+            new String[] {"gif", "GIF"},
+            new String[] {"image/gif", "image/x-gif"},
+            "helma.image.imageio.gif.GIFImageWriter",
+            STANDARD_OUTPUT_TYPE,
+            null,
+            false, null, null, null, null,
+            false, null, null, null, null
+        );
+    }
+
+    public String getDescription(Locale locale) {
+        return "Graphics Interchange Format";
+    }
+
+    public ImageWriter createWriterInstance(Object extension)
+        throws IOException {
+        return new GIFImageWriter(this);
+    }
+
+    public boolean canEncodeImage(ImageTypeSpecifier type) {
+        // FIXME handle # colors
+        return true;
+    }
+}