X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=srcjar%2Fjavajs%2Fimg%2FPngEncoder.java;fp=srcjar%2Fjavajs%2Fimg%2FPngEncoder.java;h=0000000000000000000000000000000000000000;hb=5152dafd5d71c877156621def8463d437c9c5453;hp=2dc848546909181efad0bd38a15ef6c2f46c97d2;hpb=c4cf7aa546ede43930f9a17fec5060119984da41;p=jalview.git diff --git a/srcjar/javajs/img/PngEncoder.java b/srcjar/javajs/img/PngEncoder.java deleted file mode 100644 index 2dc8485..0000000 --- a/srcjar/javajs/img/PngEncoder.java +++ /dev/null @@ -1,480 +0,0 @@ -/* $RCSfile$ - * $Author: nicove $ - * $Date: 2007-03-30 12:26:16 -0500 (Fri, 30 Mar 2007) $ - * $Revision: 7275 $ - * - * Some portions of this file have been modified by Robert Hanson hansonr.at.stolaf.edu 2012-2017 - * for use in SwingJS via transpilation into JavaScript using Java2Script. - * - * Copyright (C) 2002-2005 The Jmol Development Team - * - * Contact: jmol-developers@lists.sf.net - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - */ -package javajs.img; - -import java.io.ByteArrayOutputStream; -import java.io.IOException; -import java.util.Map; -import java.util.zip.Deflater; -import java.util.zip.DeflaterOutputStream; - - - -/** - * - * Modified by Bob Hanson hansonr@stolaf.edu to be a subclass of ImageEncoder - * and to use javajs.util.OutputChannel instead of just returning bytes. Also includes: - * - * -- JavaScript-compatible image processing - * - * -- transparent background option - * - * -- more efficient calculation of needs for pngBytes - * - * -- option to use pre-created PNGJ image data (3/19/14; Jmol 14.1.12) - * - * -- PNGJ format: - * - * // IHDR chunk - * - * // tEXt chunk "Jmol type - <0000000pt>+<000000len>" - * - * // tEXt chunk "Software - Jmol " - * - * // tEXt chunk "Creation Time - " - * - * // tRNS chunk transparent color, if desired - * - * // IDAT chunk (image data) - * - * // IEND chunk - * - * // [JMOL ZIP FILE APPENDIX] - * - * Original Comment: - * - * PngEncoder takes a Java Image object and creates a byte string which can be - * saved as a PNG file. The Image is presumed to use the DirectColorModel. - * - * Thanks to Jay Denny at KeyPoint Software http://www.keypoint.com/ who let me - * develop this code on company time. - * - * You may contact me with (probably very-much-needed) improvements, comments, - * and bug fixes at: - * - * david@catcode.com - * - * @author J. David Eisenberg - * @author http://catcode.com/pngencoder/ - * @author Christian Ribeaud (christian.ribeaud@genedata.com) - * @author Bob Hanson (hansonr@stolaf.edu) - * - * @version 1.4, 31 March 2000 - */ -public class PngEncoder extends CRCEncoder { - - /** Constants for filters */ - public static final int FILTER_NONE = 0; - public static final int FILTER_SUB = 1; - public static final int FILTER_UP = 2; - public static final int FILTER_LAST = 2; - - private static final int PT_FIRST_TAG = 37; - - private boolean encodeAlpha; - private int filter = FILTER_NONE; - private int bytesPerPixel; - private int compressionLevel; - private String type; - private Integer transparentColor; - - private byte[] appData; - private String appPrefix; - private String comment; - private byte[] bytes; - - - public PngEncoder() { - super(); - } - - @Override - protected void setParams(Map params) { - if (quality < 0) - quality = (params.containsKey("qualityPNG") ? ((Integer) params - .get("qualityPNG")).intValue() : 2); - if (quality > 9) - quality = 9; - encodeAlpha = false; - filter = FILTER_NONE; - compressionLevel = quality; - transparentColor = (Integer) params.get("transparentColor"); - comment = (String) params.get("comment"); - type = (params.get("type") + "0000").substring(0, 4); - bytes = (byte[]) params.get("pngImgData"); - appData = (byte[]) params.get("pngAppData"); - appPrefix = (String) params.get("pngAppPrefix"); - } - - - - @Override - protected void generate() throws IOException { - if (bytes == null) { - if (!pngEncode()) { - out.cancel(); - return; - } - bytes = getBytes(); - } else { - dataLen = bytes.length; - } - int len = dataLen; - if (appData != null) { - setJmolTypeText(appPrefix, bytes, len, appData.length, - type); - out.write(bytes, 0, len); - len = (bytes = appData).length; - } - out.write(bytes, 0, len); - } - - - /** - * Creates an array of bytes that is the PNG equivalent of the current image, - * specifying whether to encode alpha or not. - * - * @return true if successful - * - */ - private boolean pngEncode() { - - byte[] pngIdBytes = { -119, 80, 78, 71, 13, 10, 26, 10 }; - - writeBytes(pngIdBytes); - //hdrPos = bytePos; - writeHeader(); - writeText(getApplicationText(appPrefix, type, 0, 0)); - - writeText("Software\0" + comment); - writeText("Creation Time\0" + date); - - if (!encodeAlpha && transparentColor != null) - writeTransparentColor(transparentColor.intValue()); - //dataPos = bytePos; - return writeImageData(); - } - - /** - * Fill in the Jmol type text area with number of bytes of PNG data and number - * of bytes of Jmol state data and fix checksum. - * - * If we do not do this, then the checksum will be wrong, and Jmol and some - * other programs may not be able to read the PNG image. - * - * This was corrected for Jmol 12.3.30. Between 12.3.7 and 12.3.29, PNG files - * created by Jmol have incorrect checksums. - * - * @param prefix - * - * @param b - * @param nPNG - * @param nState - * @param type - */ - private static void setJmolTypeText(String prefix, byte[] b, int nPNG, int nState, String type) { - String s = "tEXt" + getApplicationText(prefix, type, nPNG, nState); - CRCEncoder encoder = new PngEncoder(); - byte[] test = s.substring(0, 4 + prefix.length()).getBytes(); - for (int i = test.length; -- i >= 0;) - if (b[i + PT_FIRST_TAG] != test[i]) { - System.out.println("image is not of the right form; appending data, but not adding tEXt tag."); - return; - } - encoder.setData(b, PT_FIRST_TAG); - encoder.writeString(s); - encoder.writeCRC(); - } - - /** - * Generate the PNGJ directory identifier: - * - * xxxxxxxxx\0ttttiiiiiiiii+ddddddddd - * - * where - * - * xxxxxxxxx is a unique 9-character software identifier - * tttt is a four-byte software-specific type indicator (PNG0, PNGJ, PNGT, etc.) - * iiiiiiiii is the file pointer to the start of app data - * ddddddddd is the length of the app data - * - * @param prefix up to 9 characters to allow software to recognize itself - * @param type PNGx, where x is J or T for Jmol; original type "PNG" is now "PNG0" - * @param nPNG - * @param nData - * @return - */ - private static String getApplicationText(String prefix, String type, - int nPNG, int nData) { - String sPNG = "000000000" + nPNG; - sPNG = sPNG.substring(sPNG.length() - 9); - String sData = "000000000" + nData; - sData = sData.substring(sData.length() - 9); - if (prefix == null) - prefix = "#SwingJS."; - if (prefix.length() < 9) - prefix = (prefix + "........."); - if (prefix.length() > 9) - prefix = prefix.substring(0, 9); - return prefix + "\0" + type + sPNG + "+" + sData; - } - - // /** - // * Set the filter to use - // * - // * @param whichFilter from constant list - // */ - // public void setFilter(int whichFilter) { - // this.filter = (whichFilter <= FILTER_LAST ? whichFilter : FILTER_NONE); - // } - - // /** - // * Retrieve filtering scheme - // * - // * @return int (see constant list) - // */ - // public int getFilter() { - // return filter; - // } - - // /** - // * Set the compression level to use - // * - // * @param level 0 through 9 - // */ - // public void setCompressionLevel(int level) { - // if ((level >= 0) && (level <= 9)) { - // this.compressionLevel = level; - // } - // } - - // /** - // * Retrieve compression level - // * - // * @return int in range 0-9 - // */ - // public int getCompressionLevel() { - // return compressionLevel; - // } - - /** - * Write a PNG "IHDR" chunk into the pngBytes array. - */ - private void writeHeader() { - - writeInt4(13); - startPos = bytePos; - writeString("IHDR"); - writeInt4(width); - writeInt4(height); - writeByte(8); // bit depth - writeByte(encodeAlpha ? 6 : 2); // color type or direct model - writeByte(0); // compression method - writeByte(0); // filter method - writeByte(0); // no interlace - writeCRC(); - } - - private void writeText(String msg) { - writeInt4(msg.length()); - startPos = bytePos; - writeString("tEXt" + msg); - writeCRC(); - } - - /** - * Write a PNG "tRNS" chunk into the pngBytes array. - * - * @param icolor - */ - private void writeTransparentColor(int icolor) { - - writeInt4(6); - startPos = bytePos; - writeString("tRNS"); - writeInt2((icolor >> 16) & 0xFF); - writeInt2((icolor >> 8) & 0xFF); - writeInt2(icolor & 0xFF); - writeCRC(); - } - - private byte[] scanLines; // the scan lines to be compressed - private int byteWidth; // width * bytesPerPixel - - //private int hdrPos, dataPos, endPos; - //private byte[] priorRow; - //private byte[] leftBytes; - - - /** - * Write the image data into the pngBytes array. This will write one or more - * PNG "IDAT" chunks. In order to conserve memory, this method grabs as many - * rows as will fit into 32K bytes, or the whole image; whichever is less. - * - * - * @return true if no errors; false if error grabbing pixels - */ - private boolean writeImageData() { - - bytesPerPixel = (encodeAlpha ? 4 : 3); - byteWidth = width * bytesPerPixel; - - int scanWidth = byteWidth + 1; // the added 1 is for the filter byte - - //boolean doFilter = (filter != FILTER_NONE); - - int rowsLeft = height; // number of rows remaining to write - //int startRow = 0; // starting row to process this time through - int nRows; // how many rows to grab at a time - - int scanPos; // where we are in the scan lines - - Deflater deflater = new Deflater(compressionLevel); - ByteArrayOutputStream outBytes = new ByteArrayOutputStream(1024); - - DeflaterOutputStream compBytes = new DeflaterOutputStream(outBytes, - deflater); - - int pt = 0; // overall image byte pointer - - // Jmol note: The entire image has been stored in pixels[] already - - try { - while (rowsLeft > 0) { - nRows = Math.max(1, Math.min(32767 / scanWidth, rowsLeft)); - scanLines = new byte[scanWidth * nRows]; - // if (doFilter) - // switch (filter) { - // case FILTER_SUB: - // leftBytes = new byte[16]; - // break; - // case FILTER_UP: - // priorRow = new byte[scanWidth - 1]; - // break; - // } - int nPixels = width * nRows; - scanPos = 0; - //startPos = 1; - for (int i = 0; i < nPixels; i++, pt++) { - if (i % width == 0) { - scanLines[scanPos++] = (byte) filter; - //startPos = scanPos; - } - scanLines[scanPos++] = (byte) ((pixels[pt] >> 16) & 0xff); - scanLines[scanPos++] = (byte) ((pixels[pt] >> 8) & 0xff); - scanLines[scanPos++] = (byte) ((pixels[pt]) & 0xff); - if (encodeAlpha) { - scanLines[scanPos++] = (byte) ((pixels[pt] >> 24) & 0xff); - } - // if (doFilter && i % width == width - 1) { - // switch (filter) { - // case FILTER_SUB: - // filterSub(); - // break; - // case FILTER_UP: - // filterUp(); - // break; - // } - // } - } - - /* - * Write these lines to the output area - */ - compBytes.write(scanLines, 0, scanPos); - - //startRow += nRows; - rowsLeft -= nRows; - } - compBytes.close(); - - /* - * Write the compressed bytes - */ - byte[] compressedLines = outBytes.toByteArray(); - writeInt4(compressedLines.length); - startPos = bytePos; - writeString("IDAT"); - writeBytes(compressedLines); - writeCRC(); - writeEnd(); - deflater.finish(); - return true; - } catch (IOException e) { - System.err.println(e.toString()); - return false; - } - } - - /** - * Write a PNG "IEND" chunk into the pngBytes array. - */ - private void writeEnd() { - writeInt4(0); - startPos = bytePos; - writeString("IEND"); - writeCRC(); - } - - ///** - //* Perform "sub" filtering on the given row. - //* Uses temporary array leftBytes to store the original values - //* of the previous pixels. The array is 16 bytes long, which - //* will easily hold two-byte samples plus two-byte alpha. - //* - //*/ - //private void filterSub() { - // int offset = bytesPerPixel; - // int actualStart = startPos + offset; - // int leftInsert = offset; - // int leftExtract = 0; - // //byte current_byte; - // - // for (int i = actualStart; i < startPos + byteWidth; i++) { - // leftBytes[leftInsert] = scanLines[i]; - // scanLines[i] = (byte) ((scanLines[i] - leftBytes[leftExtract]) % 256); - // leftInsert = (leftInsert + 1) % 0x0f; - // leftExtract = (leftExtract + 1) % 0x0f; - // } - //} - // - ///** - //* Perform "up" filtering on the given row. Side effect: refills the prior row - //* with current row - //* - //*/ - //private void filterUp() { - // int nBytes = width * bytesPerPixel; - // for (int i = 0; i < nBytes; i++) { - // int pt = startPos + i; - // byte b = scanLines[pt]; - // scanLines[pt] = (byte) ((scanLines[pt] - priorRow[i]) % 256); - // priorRow[i] = b; - // } - //} - -}