--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/internal/image/PngEncoder.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,364 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+module dwt.internal.image;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import dwt.DWT;
+import dwt.graphics.ImageData;
+import dwt.graphics.ImageLoader;
+import dwt.graphics.RGB;
+import dwt.internal.Compatibility;
+
+final class PngEncoder : Object {
+
+    static final byte SIGNATURE[] = {(byte) '\211', (byte) 'P', (byte) 'N', (byte) 'G', (byte) '\r', (byte) '\n', (byte) '\032', (byte) '\n'};
+    static final byte TAG_IHDR[] = {(byte) 'I', (byte) 'H', (byte) 'D', (byte) 'R'};
+    static final byte TAG_PLTE[] = {(byte) 'P', (byte) 'L', (byte) 'T', (byte) 'E'};
+    static final byte TAG_TRNS[] = {(byte) 't', (byte) 'R', (byte) 'N', (byte) 'S'};
+    static final byte TAG_IDAT[] = {(byte) 'I', (byte) 'D', (byte) 'A', (byte) 'T'};
+    static final byte TAG_IEND[] = {(byte) 'I', (byte) 'E', (byte) 'N', (byte) 'D'};
+    
+    ByteArrayOutputStream bytes = new ByteArrayOutputStream(1024);
+    PngChunk chunk;
+    
+    ImageLoader loader;
+    ImageData data;
+    int transparencyType;
+    
+    int width, height, bitDepth, colorType;
+    
+    int compressionMethod = 0;
+    int filterMethod = 0;
+    int interlaceMethod = 0;
+    
+public PngEncoder(ImageLoader loader) {
+
+    this.loader = loader;
+    this.data = loader.data[0];
+    this.transparencyType = data.getTransparencyType();
+    
+    this.width = data.width;
+    this.height = data.height;
+    
+    this.bitDepth = 8;
+    
+    this.colorType = 2;
+    
+    if (data.palette.isDirect) {
+        if (transparencyType is DWT.TRANSPARENCY_ALPHA) {
+            this.colorType = 6;
+        }
+    }
+    else {
+        this.colorType = 3;
+    }
+    
+    if (!(colorType is 2 || colorType is 3 || colorType is 6)) DWT.error(DWT.ERROR_INVALID_IMAGE);
+
+}
+
+void writeShort(ByteArrayOutputStream baos, int theShort) {
+
+    byte byte1 = (byte) ((theShort >> 8) & 0xff);
+    byte byte2 = (byte) (theShort & 0xff);
+    byte[] temp = {byte1, byte2};
+    baos.write(temp, 0, 2);
+
+}
+
+void writeInt(ByteArrayOutputStream baos, int theInt) {
+
+    byte byte1 = (byte) ((theInt >> 24) & 0xff);
+    byte byte2 = (byte) ((theInt >> 16) & 0xff);
+    byte byte3 = (byte) ((theInt >> 8) & 0xff);
+    byte byte4 = (byte) (theInt & 0xff);
+    byte[] temp = {byte1, byte2, byte3, byte4};
+    baos.write(temp, 0, 4);
+
+}
+
+void writeChunk(byte[] tag, byte[] buffer) {
+
+    int bufferLength = (buffer !is null) ? buffer.length : 0;
+    
+    chunk = new PngChunk(bufferLength);
+    
+    writeInt(bytes, bufferLength);
+    bytes.write(tag, 0, 4);
+    chunk.setType(tag);
+    if (bufferLength !is 0) {
+        bytes.write(buffer, 0, bufferLength);
+        chunk.setData(buffer);
+    }
+    else {
+        chunk.setCRC(chunk.computeCRC());
+    }
+    writeInt(bytes, chunk.getCRC());
+
+}
+
+void writeSignature() {
+
+    bytes.write(SIGNATURE, 0, 8);
+
+}
+
+void writeHeader() {
+
+    ByteArrayOutputStream baos = new ByteArrayOutputStream(13);
+    
+    writeInt(baos, width);
+    writeInt(baos, height);
+    baos.write(bitDepth);
+    baos.write(colorType);
+    baos.write(compressionMethod);
+    baos.write(filterMethod);
+    baos.write(interlaceMethod);
+    
+    writeChunk(TAG_IHDR, baos.toByteArray());
+
+}
+
+void writePalette() {
+
+    RGB[] RGBs = data.palette.getRGBs();
+    
+    if (RGBs.length > 256) DWT.error(DWT.ERROR_INVALID_IMAGE);
+    
+    ByteArrayOutputStream baos = new ByteArrayOutputStream(RGBs.length);
+    
+    for (int i = 0; i < RGBs.length; i++) {
+    
+        baos.write((byte) RGBs[i].red);
+        baos.write((byte) RGBs[i].green);
+        baos.write((byte) RGBs[i].blue);
+    
+    }
+    
+    writeChunk(TAG_PLTE, baos.toByteArray());
+
+}
+
+void writeTransparency() {
+
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    
+    switch (transparencyType) {
+    
+        case DWT.TRANSPARENCY_ALPHA:
+            
+            int pixelValue, alphaValue;
+            
+            byte[] alphas = new byte[data.palette.getRGBs().length];
+            
+            for (int y = 0; y < height; y++) {
+            
+                for (int x = 0; x < width; x++) {
+                
+                    pixelValue = data.getPixel(x, y);
+                    alphaValue = data.getAlpha(x, y);
+                    
+                    alphas[pixelValue] = (byte) alphaValue;
+                
+                }
+            
+            }
+            
+            baos.write(alphas, 0, alphas.length);
+            
+            break;
+        
+        case DWT.TRANSPARENCY_PIXEL:
+            
+            int pixel = data.transparentPixel;
+            
+            if (colorType is 2) {
+            
+                int redMask = data.palette.redMask;
+                int redShift = data.palette.redShift;
+                int greenMask = data.palette.greenMask;
+                int greenShift = data.palette.greenShift;
+                int blueShift = data.palette.blueShift;
+                int blueMask = data.palette.blueMask;
+                
+                int r = pixel & redMask;
+                r = (redShift < 0) ? r >>> -redShift : r << redShift;
+                int g = pixel & greenMask;
+                g = (greenShift < 0) ? g >>> -greenShift : g << greenShift;
+                int b = pixel & blueMask;
+                b = (blueShift < 0) ? b >>> -blueShift : b << blueShift;
+                
+                writeShort(baos, r);
+                writeShort(baos, g);
+                writeShort(baos, b);
+            
+            }
+            
+            if (colorType is 3) {
+            
+                byte[] padding = new byte[pixel + 1];
+                
+                for (int i = 0; i < pixel; i++) {
+                
+                    padding[i] = (byte) 255;
+                
+                }
+                
+                padding[pixel] = (byte) 0;
+                
+                baos.write(padding, 0, padding.length);
+            
+            }
+            
+            break;
+    
+    }
+    
+    writeChunk(TAG_TRNS, baos.toByteArray());
+
+}
+
+void writeImageData() throws IOException {
+
+    ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
+    OutputStream os = Compatibility.newDeflaterOutputStream(baos);
+    if (os is null) os = baos;
+    
+    if (colorType is 3) {
+    
+        byte[] lineData = new byte[width];
+        
+        for (int y = 0; y < height; y++) {
+            
+            int filter = 0;
+            os.write(filter);
+            
+            data.getPixels(0, y, width, lineData, 0);
+            
+            for (int x = 0; x < lineData.length; x++) {
+            
+                os.write(lineData[x]);
+            
+            }
+        
+        }
+    
+    }
+    
+    else {
+    
+        int[] lineData = new int[width];
+        byte[] alphaData = null;
+        if (colorType is 6) {
+            alphaData = new byte[width];
+        }
+        
+        int redMask = data.palette.redMask;
+        int redShift = data.palette.redShift;
+        int greenMask = data.palette.greenMask;
+        int greenShift = data.palette.greenShift;
+        int blueShift = data.palette.blueShift;
+        int blueMask = data.palette.blueMask;
+        
+        for (int y = 0; y < height; y++) {
+        
+            int filter = 0;
+            os.write(filter);
+            
+            data.getPixels(0, y, width, lineData, 0);
+            
+            if (colorType is 6) {
+                data.getAlphas(0, y, width, alphaData, 0);
+            }
+            
+            for (int x = 0; x < lineData.length; x++) {
+            
+                int pixel = lineData[x];
+                
+                int r = pixel & redMask;
+                r = (redShift < 0) ? r >>> -redShift : r << redShift;
+                int g = pixel & greenMask;
+                g = (greenShift < 0) ? g >>> -greenShift : g << greenShift;
+                int b = pixel & blueMask;
+                b = (blueShift < 0) ? b >>> -blueShift : b << blueShift;
+                
+                os.write(r);
+                os.write(g);
+                os.write(b);
+                
+                if (colorType is 6) {
+                    os.write(alphaData[x]);
+                }
+            
+            }
+        
+        }
+    
+    }
+    
+    os.flush();
+    os.close();
+    
+    byte[] compressed = baos.toByteArray();
+    if (os is baos) {
+        PngDeflater deflater = new PngDeflater();
+        compressed = deflater.deflate(compressed);
+    }
+    
+    writeChunk(TAG_IDAT, compressed);
+
+}
+
+void writeEnd() {
+
+    writeChunk(TAG_IEND, null);
+
+}
+
+public void encode(LEDataOutputStream outputStream) {
+
+    try {
+    
+        writeSignature();
+        writeHeader();
+        
+        if (colorType is 3) {
+            writePalette();
+        }
+        
+        bool transparencyAlpha = (transparencyType is DWT.TRANSPARENCY_ALPHA);
+        bool transparencyPixel = (transparencyType is DWT.TRANSPARENCY_PIXEL);
+        bool type2Transparency = (colorType is 2 && transparencyPixel);
+        bool type3Transparency = (colorType is 3 && (transparencyAlpha || transparencyPixel));
+        
+        if (type2Transparency || type3Transparency) {
+            writeTransparency();
+        }
+        
+        writeImageData();
+        writeEnd();
+        
+        outputStream.write(bytes.toByteArray());
+    
+    }
+    
+    catch (IOException e) {
+    
+        DWT.error(DWT.ERROR_IO, e);
+    
+    }
+
+}
+
+}