| import java.io.ByteArrayOutputStream;
import java.io.IOException; import net.rim.device.api.compress.ZLibOutputStream;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.util.CRC32; /**
* 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.
*
*/ public class PNGEncoder { /** Constant specifying that alpha channel should be encoded. */
public static final boolean ENCODE_ALPHA = true; /** Constant specifying that alpha channel should not be encoded. */
public static final boolean NO_ALPHA = false; /** Constants for filter (NONE) */
public static final int FILTER_NONE = 0; /** Constants for filter (SUB) */
public static final int FILTER_SUB = 1; /** Constants for filter (UP) */
public static final int FILTER_UP = 2; /** Constants for filter (LAST) */
public static final int FILTER_LAST = 2;
/** IHDR tag. */
protected static final byte IHDR[] = {73, 72, 68, 82};
/** IDAT tag. */
protected static final byte IDAT[] = {73, 68, 65, 84};
/** IEND tag. */
protected static final byte IEND[] = {73, 69, 78, 68}; /** The png bytes. */
protected byte[] pngBytes; /** The prior row. */
protected byte[] priorRow; /** The left bytes. */
protected byte[] leftBytes; /** The image. */
protected Bitmap image; /** The width. */
protected int width, height; /** The byte position. */
protected int bytePos, maxPos; /** The CRC value. */
protected int crcValue; /** Encode alpha? */
protected boolean encodeAlpha; /** The filter type. */
protected int filter; /** The bytes-per-pixel. */
protected int bytesPerPixel; /** The compression level. */
protected int compressionLevel; /**
* Class constructor
*/
public PNGEncoder() {
this(null, false, FILTER_NONE, 0);
} /**
* Class constructor specifying Image to encode, with no alpha channel encoding.
*
* @param image A Java Image object which uses the DirectColorModel
*/
public PNGEncoder(Bitmap image) {
this(image, false, FILTER_NONE, 0);
} /**
* Class constructor specifying Image to encode, and whether to encode alpha.
*
* @param image A Java Image object which uses the DirectColorModel
* @param encodeAlpha Encode the alpha channel? false=no; true=yes
*/
public PNGEncoder(Bitmap image, boolean encodeAlpha) {
this(image, encodeAlpha, FILTER_NONE, 0);
} /**
* Class constructor specifying Image to encode, whether to encode alpha, and filter to use.
*
* @param image A Java Image object which uses the DirectColorModel
* @param encodeAlpha Encode the alpha channel? false=no; true=yes
* @param whichFilter 0=none, 1=sub, 2=up
*/
public PNGEncoder(Bitmap image, boolean encodeAlpha, int whichFilter) {
this(image, encodeAlpha, whichFilter, 0);
} /**
* Class constructor specifying Image source to encode, whether to encode alpha, filter to use,
* and compression level.
*
* @param image A Java Image object
* @param encodeAlpha Encode the alpha channel? false=no; true=yes
* @param whichFilter 0=none, 1=sub, 2=up
* @param compLevel 0..9
*/
public PNGEncoder(Bitmap image, boolean encodeAlpha, int whichFilter, int compLevel) {
this.image = image;
this.encodeAlpha = encodeAlpha;
setFilter(whichFilter);
if (compLevel >= 0 && compLevel <= 9) {
this.compressionLevel = compLevel;
}
} /**
* Set the image to be encoded
*
* @param image A Java Image object which uses the DirectColorModel
*/
public void setImage(Bitmap image) {
this.image = image;
pngBytes = null;
} /**
* Creates an array of bytes that is the PNG equivalent of the current image, specifying
* whether to encode alpha or not.
*
* @param encodeAlpha boolean false=no alpha, true=encode alpha
* @return an array of bytes, or null if there was a problem
*/
public byte[] encode(boolean encodeAlpha) throws IOException {
byte[] pngIdBytes = {-119, 80, 78, 71, 13, 10, 26, 10}; if (image == null) {
return null;
}
width = image.getWidth();
height = image.getHeight(); /*
* start with an array that is big enough to hold all the pixels
* (plus filter bytes), and an extra 200 bytes for header info
*/
pngBytes = new byte[((width + 1) * height * 3) + 200]; /*
* keep track of largest byte written to the array
*/
maxPos = 0; bytePos = writeBytes(pngIdBytes, 0);
writeHeader(); if (writeImageData()) {
writeEnd();
pngBytes = resizeByteArray(pngBytes, maxPos);
}
else {
pngBytes = null;
}
return pngBytes;
} /**
* Creates an array of bytes that is the PNG equivalent of the current image.
* Alpha encoding is determined by its setting in the constructor.
*
* @return an array of bytes, or null if there was a problem
*/
public byte[] encode() throws IOException {
return encode(encodeAlpha);
} /**
* Set the alpha encoding on or off.
*
* @param encodeAlpha false=no, true=yes
*/
public void setEncodeAlpha(boolean encodeAlpha) {
this.encodeAlpha = encodeAlpha;
} /**
* Retrieve alpha encoding status.
*
* @return boolean false=no, true=yes
*/
public boolean getEncodeAlpha() {
return encodeAlpha;
} /**
* Set the filter to use
*
* @param whichFilter from constant list
*/
public void setFilter(int whichFilter) {
this.filter = FILTER_NONE;
if (whichFilter <= FILTER_LAST) {
this.filter = whichFilter;
}
} /**
* 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;
} /**
* Increase or decrease the length of a byte array.
*
* @param array The original array.
* @param newLength The length you wish the new array to have.
* @return Array of newly desired length. If shorter than the
* original, the trailing elements are truncated.
*/
protected byte[] resizeByteArray(byte[] array, int newLength) {
byte[] newArray = new byte[newLength];
int oldLength = array.length; System.arraycopy(array, 0, newArray, 0, Math.min(oldLength, newLength));
return newArray;
} /**
* Write an array of bytes into the pngBytes array.
* Note: This routine has the side effect of updating
* maxPos, the largest element written in the array.
* The array is resized by 1000 bytes or the length
* of the data to be written, whichever is larger.
*
* @param data The data to be written into pngBytes.
* @param offset The starting point to write to.
* @return The next place to be written to in the pngBytes array.
*/
protected int writeBytes(byte[] data, int offset) {
maxPos = Math.max(maxPos, offset + data.length);
if (data.length + offset > pngBytes.length) {
pngBytes = resizeByteArray(pngBytes, pngBytes.length + Math.max(1000, data.length));
}
System.arraycopy(data, 0, pngBytes, offset, data.length);
return offset + data.length;
} /**
* Write an array of bytes into the pngBytes array, specifying number of bytes to write.
* Note: This routine has the side effect of updating
* maxPos, the largest element written in the array.
* The array is resized by 1000 bytes or the length
* of the data to be written, whichever is larger.
*
* @param data The data to be written into pngBytes.
* @param nBytes The number of bytes to be written.
* @param offset The starting point to write to.
* @return The next place to be written to in the pngBytes array.
*/
protected int writeBytes(byte[] data, int nBytes, int offset) {
maxPos = Math.max(maxPos, offset + nBytes);
if (nBytes + offset > pngBytes.length) {
pngBytes = resizeByteArray(pngBytes, pngBytes.length + Math.max(1000, nBytes));
}
System.arraycopy(data, 0, pngBytes, offset, nBytes);
return offset + nBytes;
} /**
* Write a two-byte integer into the pngBytes array at a given position.
*
* @param n The integer to be written into pngBytes.
* @param offset The starting point to write to.
* @return The next place to be written to in the pngBytes array.
*/
protected int writeInt2(int n, int offset) {
byte[] temp = {(byte) ((n >> 8) & 0xff), (byte) (n & 0xff)};
return writeBytes(temp, offset);
} /**
* Write a four-byte integer into the pngBytes array at a given position.
*
* @param n The integer to be written into pngBytes.
* @param offset The starting point to write to.
* @return The next place to be written to in the pngBytes array.
*/
protected int writeInt4(int n, int offset) {
byte[] temp = {(byte) ((n >> 24) & 0xff),
(byte) ((n >> 16) & 0xff),
(byte) ((n >> 8) & 0xff),
(byte) (n & 0xff)};
return writeBytes(temp, offset);
} /**
* Write a single byte into the pngBytes array at a given position.
*
* @param b The integer to be written into pngBytes.
* @param offset The starting point to write to.
* @return The next place to be written to in the pngBytes array.
*/
protected int writeByte(int b, int offset) {
byte[] temp = {(byte) b};
return writeBytes(temp, offset);
} /**
* Write a PNG "IHDR" chunk into the pngBytes array.
*/
protected void writeHeader() {
int startPos; startPos = bytePos = writeInt4(13, bytePos);
bytePos = writeBytes(IHDR, bytePos);
width = image.getWidth();
height = image.getHeight();
bytePos = writeInt4(width, bytePos);
bytePos = writeInt4(height, bytePos);
bytePos = writeByte(8, bytePos); // bit depth
bytePos = writeByte((encodeAlpha) ? 6 : 2, bytePos); // direct model
bytePos = writeByte(0, bytePos); // compression method
bytePos = writeByte(0, bytePos); // filter method
bytePos = writeByte(0, bytePos); // no interlace
crcValue = CRC32.update(CRC32.INITIAL_VALUE, pngBytes, startPos, bytePos - startPos);
bytePos = writeInt4(crcValue, bytePos);
} /**
* 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.
*
* @param pixels The array holding the scan lines being built
* @param startPos Starting position within pixels of bytes to be filtered.
* @param width Width of a scanline in pixels.
*/
protected void filterSub(byte[] pixels, int startPos, int width) {
int i;
int offset = bytesPerPixel;
int actualStart = startPos + offset;
int nBytes = width * bytesPerPixel;
int leftInsert = offset;
int leftExtract = 0; for (i = actualStart; i < startPos + nBytes; i++) {
leftBytes[leftInsert] = pixels[i];
pixels[i] = (byte) ((pixels[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
*
* @param pixels The array holding the scan lines being built
* @param startPos Starting position within pixels of bytes to be filtered.
* @param width Width of a scanline in pixels.
*/
protected void filterUp(byte[] pixels, int startPos, int width) {
int i, nBytes;
byte currentByte; nBytes = width * bytesPerPixel; for (i = 0; i < nBytes; i++) {
currentByte = pixels[startPos + i];
pixels[startPos + i] = (byte) ((pixels[startPos + i] - priorRow[i]) % 256);
priorRow[i] = currentByte;
}
} /**
* 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
*/
protected boolean writeImageData() throws IOException {
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 byte[] scanLines; // the scan lines to be compressed
int scanPos; // where we are in the scan lines
int startPos; // where this line's actual pixels start (used for filtering) byte[] compressedLines; // the resultant compressed lines
int nCompressed; // how big is the compressed area?
bytesPerPixel = (encodeAlpha) ? 4 : 3; ByteArrayOutputStream outBytes = new ByteArrayOutputStream(1024); ZLibOutputStream compBytes = new ZLibOutputStream(outBytes); while (rowsLeft > 0) {
nRows = Math.min(32767 / (width * (bytesPerPixel + 1)), rowsLeft);
nRows = Math.max( nRows, 1 ); int[] pixels = new int[width * nRows]; image.getARGB(pixels, 0, width, 0, startRow, width, nRows);
/*
* Create a data chunk. scanLines adds "nRows" for
* the filter bytes.
*/
scanLines = new byte[width * nRows * bytesPerPixel + nRows]; if (filter == FILTER_SUB) {
leftBytes = new byte[16];
}
if (filter == FILTER_UP) {
priorRow = new byte[width * bytesPerPixel];
} scanPos = 0;
startPos = 1;
for (int i = 0; i < width * nRows; i++) {
if (i % width == 0) {
scanLines[scanPos++] = (byte) filter;
startPos = scanPos;
}
scanLines[scanPos++] = (byte) ((pixels[i] >> 16) & 0xff);
scanLines[scanPos++] = (byte) ((pixels[i] >> 8) & 0xff);
scanLines[scanPos++] = (byte) ((pixels[i]) & 0xff);
if (encodeAlpha) {
scanLines[scanPos++] = (byte) ((pixels[i] >> 24) & 0xff);
}
if ((i % width == width - 1) && (filter != FILTER_NONE)) {
if (filter == FILTER_SUB) {
filterSub(scanLines, startPos, width);
}
if (filter == FILTER_UP) {
filterUp(scanLines, startPos, width);
}
}
} /*
* Write these lines to the output area
*/
compBytes.write(scanLines, 0, scanPos); startRow += nRows;
rowsLeft -= nRows;
}
compBytes.close(); /*
* Write the compressed bytes
*/
compressedLines = outBytes.toByteArray();
nCompressed = compressedLines.length; bytePos = writeInt4(nCompressed, bytePos);
bytePos = writeBytes(IDAT, bytePos);
crcValue = CRC32.update(CRC32.INITIAL_VALUE, IDAT); bytePos = writeBytes(compressedLines, nCompressed, bytePos);
crcValue = CRC32.update(crcValue, compressedLines, 0, nCompressed); bytePos = writeInt4(crcValue, bytePos);
return true;
} /**
* Write a PNG "IEND" chunk into the pngBytes array.
*/
protected void writeEnd() {
bytePos = writeInt4(0, bytePos);
bytePos = writeBytes(IEND, bytePos);
crcValue = CRC32.update(CRC32.INITIAL_VALUE, IEND); bytePos = writeInt4(crcValue, bytePos);
} } | 
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