/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: PCLGenerator.java 1067881 2011-02-07 08:39:46Z jeremias $ */
package org.apache.fop.render.pcl;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ByteLookupTable;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.IndexColorModel;
import java.awt.image.LookupOp;
import java.awt.image.MultiPixelPackedSampleModel;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRaster;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.xmlgraphics.image.GraphicsUtil;
import org.apache.xmlgraphics.util.UnitConv;
import org.apache.fop.util.bitmap.BitmapImageUtil;
import org.apache.fop.util.bitmap.DitherUtil;
/**
* This class provides methods for generating PCL print files.
*/
public class PCLGenerator {
private static final String US_ASCII = "US-ASCII";
private static final String ISO_8859_1 = "ISO-8859-1";
/** The ESC (escape) character */
public static final char ESC = '\033';
/** A list of all supported resolutions in PCL (values in dpi) */
public static final int[] PCL_RESOLUTIONS = new int[] {75, 100, 150, 200, 300, 600};
private final DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.US);
private final DecimalFormat df2 = new DecimalFormat("0.##", symbols);
private final DecimalFormat df4 = new DecimalFormat("0.####", symbols);
private final OutputStream out;
private boolean currentSourceTransparency = true;
private boolean currentPatternTransparency = true;
private int maxBitmapResolution = PCL_RESOLUTIONS[PCL_RESOLUTIONS.length - 1];
private float ditheringQuality = 0.5f;
/**
* true: Standard PCL shades are used (poor quality). false: user-defined pattern are used
* to create custom dither patterns for better grayscale quality.
*/
private final boolean usePCLShades = false;
/**
* Main constructor.
* @param out the OutputStream to write the PCL stream to
*/
public PCLGenerator(OutputStream out) {
this.out = out;
}
/**
* Main constructor.
* @param out the OutputStream to write the PCL stream to
* @param maxResolution the maximum resolution to encode bitmap images at
*/
public PCLGenerator(OutputStream out, int maxResolution) {
this(out);
boolean found = false;
for (int i = 0; i < PCL_RESOLUTIONS.length; i++) {
if (PCL_RESOLUTIONS[i] == maxResolution) {
found = true;
break;
}
}
if (!found) {
throw new IllegalArgumentException("Illegal value for maximum resolution!");
}
this.maxBitmapResolution = maxResolution;
}
/** @return the OutputStream that this generator writes to */
public OutputStream getOutputStream() {
return this.out;
}
/**
* Returns the currently active text encoding.
* @return the text encoding
*/
public String getTextEncoding() {
return ISO_8859_1;
}
/** @return the maximum resolution to encode bitmap images at */
public int getMaximumBitmapResolution() {
return this.maxBitmapResolution;
}
/**
* Writes a PCL escape command to the output stream.
* @param cmd the command (without the ESCAPE character)
* @throws IOException In case of an I/O error
*/
public void writeCommand(String cmd) throws IOException {
out.write(27); //ESC
out.write(cmd.getBytes(US_ASCII));
}
/**
* Writes raw text (in ISO-8859-1 encoding) to the output stream.
* @param s the text
* @throws IOException In case of an I/O error
*/
public void writeText(String s) throws IOException {
out.write(s.getBytes(ISO_8859_1));
}
/**
* Formats a double value with two decimal positions for PCL output.
*
* @param value value to format
* @return the formatted value
*/
public final String formatDouble2(double value) {
return df2.format(value);
}
/**
* Formats a double value with four decimal positions for PCL output.
*
* @param value value to format
* @return the formatted value
*/
public final String formatDouble4(double value) {
return df4.format(value);
}
/**
* Sends the universal end of language command (UEL).
* @throws IOException In case of an I/O error
*/
public void universalEndOfLanguage() throws IOException {
writeCommand("%-12345X");
}
/**
* Resets the printer and restores the user default environment.
* @throws IOException In case of an I/O error
*/
public void resetPrinter() throws IOException {
writeCommand("E");
}
/**
* Sends the job separation command.
* @throws IOException In case of an I/O error
*/
public void separateJobs() throws IOException {
writeCommand("&l1T");
}
/**
* Sends the form feed character.
* @throws IOException In case of an I/O error
*/
public void formFeed() throws IOException {
out.write(12); //=OC ("FF", Form feed)
}
/**
* Sets the unit of measure.
* @param value the resolution value (units per inch)
* @throws IOException In case of an I/O error
*/
public void setUnitOfMeasure(int value) throws IOException {
writeCommand("&u" + value + "D");
}
/**
* Sets the raster graphics resolution
* @param value the resolution value (units per inch)
* @throws IOException In case of an I/O error
*/
public void setRasterGraphicsResolution(int value) throws IOException {
writeCommand("*t" + value + "R");
}
/**
* Selects the page size.
* @param selector the integer representing the page size
* @throws IOException In case of an I/O error
*/
public void selectPageSize(int selector) throws IOException {
writeCommand("&l" + selector + "A");
}
/**
* Selects the paper source. The parameter is usually printer-specific. Usually, "1" is the
* default tray, "2" is the manual paper feed, "3" is the manual envelope feed, "4" is the
* "lower" tray and "7" is "auto-select". Consult the technical reference for your printer
* for all available values.
* @param selector the integer representing the paper source/tray
* @throws IOException In case of an I/O error
*/
public void selectPaperSource(int selector) throws IOException {
writeCommand("&l" + selector + "H");
}
/**
* Selects the output bin. The parameter is usually printer-specific. Usually, "1" is the
* default output bin (upper bin) and "2" is the lower (rear) output bin. Some printers
* may support additional output bins. Consult the technical reference for your printer
* for all available values.
* @param selector the integer representing the output bin
* @throws IOException In case of an I/O error
*/
public void selectOutputBin(int selector) throws IOException {
writeCommand("&l" + selector + "G");
}
/**
* Selects the duplexing mode for the page.
* The parameter is usually printer-specific.
* "0" means Simplex,
* "1" means Duplex, Long-Edge Binding,
* "2" means Duplex, Short-Edge Binding.
* @param selector the integer representing the duplexing mode of the page
* @throws IOException In case of an I/O error
*/
public void selectDuplexMode(int selector) throws IOException {
writeCommand("&l" + selector + "S");
}
/**
* Clears the horizontal margins.
* @throws IOException In case of an I/O error
*/
public void clearHorizontalMargins() throws IOException {
writeCommand("9");
}
/**
* The Top Margin command designates the number of lines between
* the top of the logical page and the top of the text area.
* @param numberOfLines the number of lines (See PCL specification for details)
* @throws IOException In case of an I/O error
*/
public void setTopMargin(int numberOfLines) throws IOException {
writeCommand("&l" + numberOfLines + "E");
}
/**
* The Text Length command can be used to define the bottom border. See the PCL specification
* for details.
* @param numberOfLines the number of lines
* @throws IOException In case of an I/O error
*/
public void setTextLength(int numberOfLines) throws IOException {
writeCommand("&l" + numberOfLines + "F");
}
/**
* Sets the Vertical Motion Index (VMI).
* @param value the VMI value
* @throws IOException In case of an I/O error
*/
public void setVMI(double value) throws IOException {
writeCommand("&l" + formatDouble4(value) + "C");
}
/**
* Sets the cursor to a new absolute coordinate.
* @param x the X coordinate (in millipoints)
* @param y the Y coordinate (in millipoints)
* @throws IOException In case of an I/O error
*/
public void setCursorPos(double x, double y) throws IOException {
if (x < 0) {
//A negative x value will result in a relative movement so go to "0" first.
//But this will most probably have no effect anyway since you can't paint to the left
//of the logical page
writeCommand("&a0h" + formatDouble2(x / 100) + "h" + formatDouble2(y / 100) + "V");
} else {
writeCommand("&a" + formatDouble2(x / 100) + "h" + formatDouble2(y / 100) + "V");
}
}
/**
* Pushes the current cursor position on a stack (stack size: max 20 entries)
* @throws IOException In case of an I/O error
*/
public void pushCursorPos() throws IOException {
writeCommand("&f0S");
}
/**
* Pops the current cursor position from the stack.
* @throws IOException In case of an I/O error
*/
public void popCursorPos() throws IOException {
writeCommand("&f1S");
}
/**
* Changes the current print direction while maintaining the current cursor position.
* @param rotate the rotation angle (counterclockwise), one of 0, 90, 180 and 270.
* @throws IOException In case of an I/O error
*/
public void changePrintDirection(int rotate) throws IOException {
writeCommand("&a" + rotate + "P");
}
/**
* Enters the HP GL/2 mode.
* @param restorePreviousHPGL2Cursor true if the previous HP GL/2 pen position should be
* restored, false if the current position is maintained
* @throws IOException In case of an I/O error
*/
public void enterHPGL2Mode(boolean restorePreviousHPGL2Cursor) throws IOException {
if (restorePreviousHPGL2Cursor) {
writeCommand("%0B");
} else {
writeCommand("%1B");
}
}
/**
* Enters the PCL mode.
* @param restorePreviousPCLCursor true if the previous PCL cursor position should be restored,
* false if the current position is maintained
* @throws IOException In case of an I/O error
*/
public void enterPCLMode(boolean restorePreviousPCLCursor) throws IOException {
if (restorePreviousPCLCursor) {
writeCommand("%0A");
} else {
writeCommand("%1A");
}
}
/**
* Generate a filled rectangle at the current cursor position.
*
* @param w the width in millipoints
* @param h the height in millipoints
* @param col the fill color
* @throws IOException In case of an I/O error
*/
protected void fillRect(int w, int h, Color col) throws IOException {
if ((w == 0) || (h == 0)) {
return;
}
if (h < 0) {
h *= -1;
} else {
//y += h;
}
setPatternTransparencyMode(false);
if (usePCLShades
|| Color.black.equals(col)
|| Color.white.equals(col)) {
writeCommand("*c" + formatDouble4(w / 100.0) + "h"
+ formatDouble4(h / 100.0) + "V");
int lineshade = convertToPCLShade(col);
writeCommand("*c" + lineshade + "G");
writeCommand("*c2P"); //Shaded fill
} else {
defineGrayscalePattern(col, 32, DitherUtil.DITHER_MATRIX_4X4);
writeCommand("*c" + formatDouble4(w / 100.0) + "h"
+ formatDouble4(h / 100.0) + "V");
writeCommand("*c32G");
writeCommand("*c4P"); //User-defined pattern
}
// Reset pattern transparency mode.
setPatternTransparencyMode(true);
}
/**
* Generates a user-defined pattern for a dithering pattern matching the grayscale value
* of the color given.
* @param col the color to create the pattern for
* @param patternID the pattern ID to use
* @param ditherMatrixSize the size of the Bayer dither matrix to use (4 or 8 supported)
* @throws IOException In case of an I/O error
*/
public void defineGrayscalePattern(Color col, int patternID, int ditherMatrixSize)
throws IOException {
ByteArrayOutputStream baout = new ByteArrayOutputStream();
DataOutputStream data = new DataOutputStream(baout);
data.writeByte(0); //Format
data.writeByte(0); //Continuation
data.writeByte(1); //Pixel Encoding
data.writeByte(0); //Reserved
data.writeShort(8); //Width in Pixels
data.writeShort(8); //Height in Pixels
//data.writeShort(600); //X Resolution (didn't manage to get that to work)
//data.writeShort(600); //Y Resolution
int gray255 = convertToGray(col.getRed(), col.getGreen(), col.getBlue());
byte[] pattern;
if (ditherMatrixSize == 8) {
pattern = DitherUtil.getBayerDither(DitherUtil.DITHER_MATRIX_8X8, gray255, false);
} else {
//Since a 4x4 pattern did not work, the 4x4 pattern is applied 4 times to an
//8x8 pattern. Maybe this could be changed to use an 8x8 bayer dither pattern
//instead of the 4x4 one.
pattern = DitherUtil.getBayerDither(DitherUtil.DITHER_MATRIX_4X4, gray255, true);
}
data.write(pattern);
if ((baout.size() % 2) > 0) {
baout.write(0);
}
writeCommand("*c" + patternID + "G");
writeCommand("*c" + baout.size() + "W");
baout.writeTo(this.out);
writeCommand("*c4Q"); //temporary pattern
}
/**
* Sets the source transparency mode.
* @param transparent true if transparent, false for opaque
* @throws IOException In case of an I/O error
*/
public void setSourceTransparencyMode(boolean transparent) throws IOException {
setTransparencyMode(transparent, currentPatternTransparency);
}
/**
* Sets the pattern transparency mode.
* @param transparent true if transparent, false for opaque
* @throws IOException In case of an I/O error
*/
public void setPatternTransparencyMode(boolean transparent) throws IOException {
setTransparencyMode(currentSourceTransparency, transparent);
}
/**
* Sets the transparency modes.
* @param source source transparency: true if transparent, false for opaque
* @param pattern pattern transparency: true if transparent, false for opaque
* @throws IOException In case of an I/O error
*/
public void setTransparencyMode(boolean source, boolean pattern) throws IOException {
if (source != currentSourceTransparency && pattern != currentPatternTransparency) {
writeCommand("*v" + (source ? '0' : '1') + "n" + (pattern ? '0' : '1') + "O");
} else if (source != currentSourceTransparency) {
writeCommand("*v" + (source ? '0' : '1') + "N");
} else if (pattern != currentPatternTransparency) {
writeCommand("*v" + (pattern ? '0' : '1') + "O");
}
this.currentSourceTransparency = source;
this.currentPatternTransparency = pattern;
}
/**
* Convert an RGB color value to a grayscale from 0 to 100.
* @param r the red component
* @param g the green component
* @param b the blue component
* @return the gray value
*/
public final int convertToGray(int r, int g, int b) {
return BitmapImageUtil.convertToGray(r, g, b);
}
/**
* Convert a Color value to a PCL shade value (0-100).
* @param col the color
* @return the PCL shade value (100=black)
*/
public final int convertToPCLShade(Color col) {
float gray = convertToGray(col.getRed(), col.getGreen(), col.getBlue()) / 255f;
return (int)(100 - (gray * 100f));
}
/**
* Selects the current grayscale color (the given color is converted to grayscales).
* @param col the color
* @throws IOException In case of an I/O error
*/
public void selectGrayscale(Color col) throws IOException {
if (Color.black.equals(col)) {
selectCurrentPattern(0, 0); //black
} else if (Color.white.equals(col)) {
selectCurrentPattern(0, 1); //white
} else {
if (usePCLShades) {
selectCurrentPattern(convertToPCLShade(col), 2);
} else {
defineGrayscalePattern(col, 32, DitherUtil.DITHER_MATRIX_4X4);
selectCurrentPattern(32, 4);
}
}
}
/**
* Select the current pattern
* @param patternID the pattern ID (<ESC>*c#G command)
* @param pattern the pattern type (<ESC>*v#T command)
* @throws IOException In case of an I/O error
*/
public void selectCurrentPattern(int patternID, int pattern) throws IOException {
if (pattern > 1) {
writeCommand("*c" + patternID + "G");
}
writeCommand("*v" + pattern + "T");
}
/**
* Sets the dithering quality used when encoding gray or color images. If not explicitely
* set a medium setting (0.5f) is used.
* @param quality a quality setting between 0.0f (worst/fastest) and 1.0f (best/slowest)
*/
public void setDitheringQuality(float quality) {
quality = Math.min(Math.max(0f, quality), 1.0f);
this.ditheringQuality = quality;
}
/**
* Returns the dithering quality used when encoding gray or color images.
* @return the quality setting between 0.0f (worst/fastest) and 1.0f (best/slowest)
*/
public float getDitheringQuality() {
return this.ditheringQuality;
}
/**
* Indicates whether an image is a monochrome (b/w) image.
* @param img the image
* @return true if it's a monochrome image
*/
public static boolean isMonochromeImage(RenderedImage img) {
return BitmapImageUtil.isMonochromeImage(img);
}
/**
* Indicates whether an image is a grayscale image.
* @param img the image
* @return true if it's a grayscale image
*/
public static boolean isGrayscaleImage(RenderedImage img) {
return BitmapImageUtil.isGrayscaleImage(img);
}
private static int jaiAvailable = -1; //no synchronization necessary, not critical
/**
* Indicates whether JAI is available. JAI has shown to be reliable when dithering a
* grayscale or color image to monochrome bitmaps (1-bit).
* @return true if JAI is available
*/
public static boolean isJAIAvailable() {
if (jaiAvailable < 0) {
try {
String clName = "javax.media.jai.JAI";
Class.forName(clName);
jaiAvailable = 1;
} catch (ClassNotFoundException cnfe) {
jaiAvailable = 0;
}
}
return (jaiAvailable > 0);
}
private int calculatePCLResolution(int resolution) {
return calculatePCLResolution(resolution, false);
}
/**
* Calculates the ideal PCL resolution for a given resolution.
* @param resolution the input resolution
* @param increased true if you want to go to a higher resolution, for example if you
* convert grayscale or color images to monochrome images so dithering has
* a chance to generate better quality.
* @return the resulting PCL resolution (one of 75, 100, 150, 200, 300, 600)
*/
private int calculatePCLResolution(int resolution, boolean increased) {
int choice = -1;
for (int i = PCL_RESOLUTIONS.length - 2; i >= 0; i--) {
if (resolution > PCL_RESOLUTIONS[i]) {
int idx = i + 1;
if (idx < PCL_RESOLUTIONS.length - 2) {
idx += increased ? 2 : 0;
} else if (idx < PCL_RESOLUTIONS.length - 1) {
idx += increased ? 1 : 0;
}
choice = idx;
break;
//return PCL_RESOLUTIONS[idx];
}
}
if (choice < 0) {
choice = (increased ? 2 : 0);
}
while (choice > 0 && PCL_RESOLUTIONS[choice] > getMaximumBitmapResolution()) {
choice--;
}
return PCL_RESOLUTIONS[choice];
}
private boolean isValidPCLResolution(int resolution) {
return resolution == calculatePCLResolution(resolution);
}
//Threshold table to convert an alpha channel (8-bit) into a clip mask (1-bit)
private static final byte[] THRESHOLD_TABLE = new byte[256];
static { // Initialize the arrays
for (int i = 0; i < 256; i++) {
THRESHOLD_TABLE[i] = (byte) ((i < 240) ? 255 : 0);
}
}
private RenderedImage getMask(RenderedImage img, Dimension targetDim) {
ColorModel cm = img.getColorModel();
if (cm.hasAlpha()) {
BufferedImage alpha = new BufferedImage(img.getWidth(), img.getHeight(),
BufferedImage.TYPE_BYTE_GRAY);
Raster raster = img.getData();
GraphicsUtil.copyBand(raster, cm.getNumColorComponents(), alpha.getRaster(), 0);
BufferedImageOp op1 = new LookupOp(new ByteLookupTable(0, THRESHOLD_TABLE), null);
BufferedImage alphat = op1.filter(alpha, null);
BufferedImage mask;
if (true) {
mask = new BufferedImage(targetDim.width, targetDim.height,
BufferedImage.TYPE_BYTE_BINARY);
} else {
byte[] arr = {(byte)0, (byte)0xff};
ColorModel colorModel = new IndexColorModel(1, 2, arr, arr, arr);
WritableRaster wraster = Raster.createPackedRaster(DataBuffer.TYPE_BYTE,
targetDim.width, targetDim.height, 1, 1, null);
mask = new BufferedImage(colorModel, wraster, false, null);
}
Graphics2D g2d = mask.createGraphics();
try {
AffineTransform at = new AffineTransform();
double sx = targetDim.getWidth() / img.getWidth();
double sy = targetDim.getHeight() / img.getHeight();
at.scale(sx, sy);
g2d.drawRenderedImage(alphat, at);
} finally {
g2d.dispose();
}
/*
try {
BatchDiffer.saveAsPNG(alpha, new java.io.File("D:/out-alpha.png"));
BatchDiffer.saveAsPNG(mask, new java.io.File("D:/out-mask.png"));
} catch (IOException e) {
e.printStackTrace();
}*/
return mask;
} else {
return null;
}
}
/**
* Paint a bitmap at the current cursor position. The bitmap is converted to a monochrome
* (1-bit) bitmap image.
* @param img the bitmap image
* @param targetDim the target Dimention (in mpt)
* @param sourceTransparency true if the background should not be erased
* @throws IOException In case of an I/O error
*/
public void paintBitmap(RenderedImage img, Dimension targetDim, boolean sourceTransparency)
throws IOException {
double targetHResolution = img.getWidth() / UnitConv.mpt2in(targetDim.width);
double targetVResolution = img.getHeight() / UnitConv.mpt2in(targetDim.height);
double targetResolution = Math.max(targetHResolution, targetVResolution);
int resolution = (int)Math.round(targetResolution);
int effResolution = calculatePCLResolution(resolution, true);
Dimension orgDim = new Dimension(img.getWidth(), img.getHeight());
Dimension effDim;
if (targetResolution == effResolution) {
effDim = orgDim; //avoid scaling side-effects
} else {
effDim = new Dimension(
(int)Math.ceil(UnitConv.mpt2px(targetDim.width, effResolution)),
(int)Math.ceil(UnitConv.mpt2px(targetDim.height, effResolution)));
}
boolean scaled = !orgDim.equals(effDim);
//ImageWriterUtil.saveAsPNG(img, new java.io.File("D:/text-0-org.png"));
boolean monochrome = isMonochromeImage(img);
if (!monochrome) {
//Transparency mask disabled. Doesn't work reliably
final boolean transparencyDisabled = true;
RenderedImage mask = (transparencyDisabled ? null : getMask(img, effDim));
if (mask != null) {
pushCursorPos();
selectCurrentPattern(0, 1); //Solid white
setTransparencyMode(true, true);
paintMonochromeBitmap(mask, effResolution);
popCursorPos();
}
RenderedImage red = BitmapImageUtil.convertToMonochrome(
img, effDim, this.ditheringQuality);
selectCurrentPattern(0, 0); //Solid black
setTransparencyMode(sourceTransparency || mask != null, true);
paintMonochromeBitmap(red, effResolution);
} else {
RenderedImage effImg = img;
if (scaled) {
effImg = BitmapImageUtil.convertToMonochrome(img, effDim);
}
setSourceTransparencyMode(sourceTransparency);
selectCurrentPattern(0, 0); //Solid black
paintMonochromeBitmap(effImg, effResolution);
}
}
private int toGray(int rgb) {
// see http://www.jguru.com/faq/view.jsp?EID=221919
double greyVal = 0.072169d * (rgb & 0xff);
rgb >>= 8;
greyVal += 0.715160d * (rgb & 0xff);
rgb >>= 8;
greyVal += 0.212671d * (rgb & 0xff);
return (int)greyVal;
}
/**
* Paint a bitmap at the current cursor position. The bitmap must be a monochrome
* (1-bit) bitmap image.
* @param img the bitmap image (must be 1-bit b/w)
* @param resolution the resolution of the image (must be a PCL resolution)
* @throws IOException In case of an I/O error
*/
public void paintMonochromeBitmap(RenderedImage img, int resolution) throws IOException {
if (!isValidPCLResolution(resolution)) {
throw new IllegalArgumentException("Invalid PCL resolution: " + resolution);
}
boolean monochrome = isMonochromeImage(img);
if (!monochrome) {
throw new IllegalArgumentException("img must be a monochrome image");
}
setRasterGraphicsResolution(resolution);
writeCommand("*r0f" + img.getHeight() + "t" + img.getWidth() + "s1A");
Raster raster = img.getData();
Encoder encoder = new Encoder(img);
// Transfer graphics data
int imgw = img.getWidth();
IndexColorModel cm = (IndexColorModel)img.getColorModel();
if (cm.getTransferType() == DataBuffer.TYPE_BYTE) {
DataBufferByte dataBuffer = (DataBufferByte)raster.getDataBuffer();
MultiPixelPackedSampleModel packedSampleModel = new MultiPixelPackedSampleModel(
DataBuffer.TYPE_BYTE, img.getWidth(), img.getHeight(), 1);
if (img.getSampleModel().equals(packedSampleModel)
&& dataBuffer.getNumBanks() == 1) {
//Optimized packed encoding
byte[] buf = dataBuffer.getData();
int scanlineStride = packedSampleModel.getScanlineStride();
int idx = 0;
int c0 = toGray(cm.getRGB(0));
int c1 = toGray(cm.getRGB(1));
boolean zeroIsWhite = c0 > c1;
for (int y = 0, maxy = img.getHeight(); y < maxy; y++) {
for (int x = 0, maxx = scanlineStride; x < maxx; x++) {
if (zeroIsWhite) {
encoder.add8Bits(buf[idx]);
} else {
encoder.add8Bits((byte)~buf[idx]);
}
idx++;
}
encoder.endLine();
}
} else {
//Optimized non-packed encoding
for (int y = 0, maxy = img.getHeight(); y < maxy; y++) {
byte[] line = (byte[])raster.getDataElements(0, y, imgw, 1, null);
for (int x = 0, maxx = imgw; x < maxx; x++) {
encoder.addBit(line[x] == 0);
}
encoder.endLine();
}
}
} else {
//Safe but slow fallback
for (int y = 0, maxy = img.getHeight(); y < maxy; y++) {
for (int x = 0, maxx = imgw; x < maxx; x++) {
int sample = raster.getSample(x, y, 0);
encoder.addBit(sample == 0);
}
encoder.endLine();
}
}
// End raster graphics
writeCommand("*rB");
}
private class Encoder {
private int imgw;
private int bytewidth;
private byte[] rle; //compressed (RLE)
private byte[] uncompressed; //uncompressed
private int lastcount = -1;
private byte lastbyte = 0;
private int rlewidth = 0;
private byte ib = 0; //current image bits
private int x = 0;
private boolean zeroRow = true;
public Encoder(RenderedImage img) {
imgw = img.getWidth();
bytewidth = (imgw / 8);
if ((imgw % 8) != 0) {
bytewidth++;
}
rle = new byte[bytewidth * 2];
uncompressed = new byte[bytewidth];
}
public void addBit(boolean bit) {
//Set image bit for black
if (bit) {
ib |= 1;
}
//RLE encoding
if ((x % 8) == 7 || ((x + 1) == imgw)) {
finishedByte();
} else {
ib <<= 1;
}
x++;
}
public void add8Bits(byte b) {
ib = b;
finishedByte();
x += 8;
}
private void finishedByte() {
if (rlewidth < bytewidth) {
if (lastcount >= 0) {
if (ib == lastbyte) {
lastcount++;
} else {
rle[rlewidth++] = (byte)(lastcount & 0xFF);
rle[rlewidth++] = lastbyte;
lastbyte = ib;
lastcount = 0;
}
} else {
lastbyte = ib;
lastcount = 0;
}
if (lastcount == 255 || ((x + 1) == imgw)) {
rle[rlewidth++] = (byte)(lastcount & 0xFF);
rle[rlewidth++] = lastbyte;
lastbyte = 0;
lastcount = -1;
}
}
uncompressed[x / 8] = ib;
if (ib != 0) {
zeroRow = false;
}
ib = 0;
}
public void endLine() throws IOException {
if (zeroRow && PCLGenerator.this.currentSourceTransparency) {
writeCommand("*b1Y");
} else if (rlewidth < bytewidth) {
writeCommand("*b1m" + rlewidth + "W");
out.write(rle, 0, rlewidth);
} else {
writeCommand("*b0m" + bytewidth + "W");
out.write(uncompressed);
}
lastcount = -1;
rlewidth = 0;
ib = 0;
x = 0;
zeroRow = true;
}
}
}