--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.internal.image;
+
+import java.io.*;
+import java.util.zip.*;
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+
+final class PngEncoder extends 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'};
+
+ static final int NO_COMPRESSION = 0;
+ static final int BEST_SPEED = 1;
+ static final int BEST_COMPRESSION = 9;
+ static final int DEFAULT_COMPRESSION = -1;
+
+ 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 == SWT.TRANSPARENCY_ALPHA) {
+ this.colorType = 6;
+ }
+ }
+ else {
+ this.colorType = 3;
+ }
+
+ if (!(colorType == 2 || colorType == 3 || colorType == 6)) SWT.error(SWT.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 != null) ? buffer.length : 0;
+
+ chunk = new PngChunk(bufferLength);
+
+ writeInt(bytes, bufferLength);
+ bytes.write(tag, 0, 4);
+ chunk.setType(tag);
+ if (bufferLength != 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) SWT.error(SWT.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 SWT.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 SWT.TRANSPARENCY_PIXEL:
+
+ int pixel = data.transparentPixel;
+
+ if (colorType == 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 == 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 = null;
+ switch (loader.compression) {
+ case 0:
+ os = new DeflaterOutputStream(baos, new Deflater(NO_COMPRESSION));
+ break;
+ case 1:
+ os = new DeflaterOutputStream(baos, new Deflater(BEST_SPEED));
+ break;
+ case 3:
+ os = new DeflaterOutputStream(baos, new Deflater(BEST_COMPRESSION));
+ break;
+ default:
+ os = new DeflaterOutputStream(baos, new Deflater(DEFAULT_COMPRESSION));
+ break;
+ }
+
+ if (colorType == 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);
+
+ os.write(lineData);
+
+ }
+
+ }
+
+ else {
+
+ int[] lineData = new int[width];
+ byte[] alphaData = null;
+ if (colorType == 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;
+
+ byte[] lineBytes = new byte[width * (colorType == 6 ? 4 : 3)];
+
+ for (int y = 0; y < height; y++) {
+
+ int filter = 0;
+ os.write(filter);
+
+ data.getPixels(0, y, width, lineData, 0);
+
+ if (colorType == 6) {
+ data.getAlphas(0, y, width, alphaData, 0);
+ }
+
+ int offset = 0;
+ for (int x = 0; x < lineData.length; x++) {
+
+ int pixel = lineData[x];
+
+ int r = pixel & redMask;
+ lineBytes[offset++] = (byte) ((redShift < 0) ? r >>> -redShift
+ : r << redShift);
+ int g = pixel & greenMask;
+ lineBytes[offset++] = (byte) ((greenShift < 0) ? g >>> -greenShift
+ : g << greenShift);
+ int b = pixel & blueMask;
+ lineBytes[offset++] = (byte) ((blueShift < 0) ? b >>> -blueShift
+ : b << blueShift);
+
+ if (colorType == 6) {
+ lineBytes[offset++] = alphaData[x];
+ }
+
+ }
+
+ os.write(lineBytes);
+
+ }
+
+ }
+
+ os.flush();
+ os.close();
+
+ byte[] compressed = baos.toByteArray();
+ if (os == baos) {
+ /* Use PngDeflater for J2ME. */
+ 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 == 3) {
+ writePalette();
+ }
+
+ boolean transparencyAlpha = (transparencyType == SWT.TRANSPARENCY_ALPHA);
+ boolean transparencyPixel = (transparencyType == SWT.TRANSPARENCY_PIXEL);
+ boolean type2Transparency = (colorType == 2 && transparencyPixel);
+ boolean type3Transparency = (colorType == 3 && (transparencyAlpha || transparencyPixel));
+
+ if (type2Transparency || type3Transparency) {
+ writeTransparency();
+ }
+
+ writeImageData();
+ writeEnd();
+
+ outputStream.write(bytes.toByteArray());
+
+ }
+
+ catch (IOException e) {
+
+ SWT.error(SWT.ERROR_IO, e);
+
+ }
+
+}
+
+}
Code Review / simantics / platform.git / blobdiff