+++ /dev/null
-/*
- * This file was adapted from D J Hagberg's GifDecoder.java
- *
- * This software is copyrighted by D. J. Hagberg, Jr., and other parties.
- * The following terms apply to all files associated with the software
- * unless explicitly disclaimed in individual files.
- *
- * The authors hereby grant permission to use, copy, modify, distribute,
- * and license this software and its documentation for any purpose, provided
- * that existing copyright notices are retained in all copies and that this
- * notice is included verbatim in any distributions. No written agreement,
- * license, or royalty fee is required for any of the authorized uses.
- * Modifications to this software may be copyrighted by their authors
- * and need not follow the licensing terms described here, provided that
- * the new terms are clearly indicated on the first page of each file where
- * they apply.
- *
- * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY
- * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- * ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
- * DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE
- * IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE
- * NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
- * MODIFICATIONS.
- *
- * GOVERNMENT USE: If you are acquiring this software on behalf of the
- * U.S. government, the Government shall have only "Restricted Rights"
- * in the software and related documentation as defined in the Federal
- * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
- * are acquiring the software on behalf of the Department of Defense, the
- * software shall be classified as "Commercial Computer Software" and the
- * Government shall have only "Restricted Rights" as defined in Clause
- * 252.227-7013 (c) (1) of DFARs. Notwithstanding the foregoing, the
- * authors grant the U.S. Government and others acting in its behalf
- * permission to use and distribute the software in accordance with the
- * terms specified in this license.
- *
- */
-package org.xwt;
-
-import org.xwt.util.*;
-import java.io.BufferedInputStream;
-import java.io.InputStream;
-import java.io.IOException;
-import java.io.PrintWriter;
-
-/** Converts an InputStream carrying a GIF image into an ARGB int[] */
-public class GIF extends ImageDecoder {
-
- // Public Methods /////////////////////////////////////////////////////////
-
- public int[] getData() { return data; }
- public int getWidth() { return width; }
- public int getHeight() { return height; }
-
- /** Processes an image from InputStream is; returns null if there is an error
- @param name A string describing the image; used for error reporting.
- */
- public static GIF decode(InputStream is, String name) {
- try {
- return new GIF(is, name);
- } catch (Exception e) {
- if (Log.on) Log.log(GIF.class, e);
- return null;
- }
- }
-
- private GIF(InputStream is, String name) throws IOException {
- if (is instanceof BufferedInputStream) _in = (BufferedInputStream)is;
- else _in = new BufferedInputStream(is);
- decodeAsBufferedImage(0);
- }
-
- // Private Methods /////////////////////////////////////////////////////////
-
- private int[] data = null;
-
- /** Decode a particular frame from the GIF file. Frames must be decoded in order, starting with 0. */
- private void decodeAsBufferedImage(int page) throws IOException, IOException {
-
- // If the user requested a page already decoded, we cannot go back.
- if (page <= index ) return;
-
- // If we just started reading this stream, initialize the global info.
- if (index < 0 ) {
- if (!readIntoBuf(6) || _buf[0] != 'G' || _buf[1] != 'I' || _buf[2] != 'F' ||
- _buf[3] != '8' || !(_buf[4] == '7' || _buf[4] == '9') || _buf[5] != 'a')
- throw new IOException("Not a GIF8Xa file.");
- if (!readGlobalImageDescriptor()) throw new IOException("Unable to read GIF header.");
- }
-
- // Loop through the blocks in the image.
- int block_identifier;
- while (true) {
- if(!readIntoBuf(1)) throw new IOException("Unexpected EOF(1)");
- block_identifier = _buf[0];
- if (block_identifier == ';') throw new IOException("No image data");
- if (block_identifier == '!') {
- if (!readExtensionBlock()) throw new IOException("Unexpected EOF(2)");
- continue;
- }
-
- // not a valid start character -- ignore it.
- if (block_identifier != ',') continue;
-
- if (!readLocalImageDescriptor()) throw new IOException("Unexpected EOF(3)");
- data = new int[width * height];
- readImage();
-
- // If we did not decode the requested index, need to go on
- // to the next one (future implementations should consider
- // caching already-decoded images here to allow for random
- // access to animated GIF pages).
- index++;
- if (index < page) continue;
-
- // If we did decode the requested index, we can return.
- break;
- }
-
- // Return the image thus-far decoded
- return;
- }
-
- /** Actually read the image data */
- private void readImage()
- throws IOException, IOException {
- int len = width;
- int rows = height;
- int initialCodeSize;
- int v;
- int xpos = 0, ypos = 0, pass = 0, i;
- int prefix[] = new int[(1 << MAX_LWZ_BITS)];
- int append[] = new int[(1 << MAX_LWZ_BITS)];
- int stack[] = new int[(1 << MAX_LWZ_BITS)*2];
- int top_idx;
- int codeSize, clearCode, inCode, endCode, oldCode, maxCode, code, firstCode;
-
- // Initialize the decoder
- if (!readIntoBuf(1)) throw new IOException("Unexpected EOF decoding image");
- initialCodeSize = _buf[0];
-
- // Look at the right color map, setting up transparency if called for.
- int[] cmap = global_color_map;
- if (hascmap) cmap = color_map;
- if (trans_idx >= 0) cmap[trans_idx] = 0x00000000;
-
- /* Initialize the decoder */
- /* Set values for "special" numbers:
- * clear code reset the decoder
- * end code stop decoding
- * code size size of the next code to retrieve
- * max code next available table position
- */
- clearCode = 1 << initialCodeSize;
- endCode = clearCode + 1;
- codeSize = initialCodeSize + 1;
- maxCode = clearCode + 2;
- oldCode = -1;
- firstCode = -1;
-
- for (i = 0; i < clearCode; i++) append[i] = i;
- top_idx = 0; // top of stack.
-
- bitsInWindow = 0;
- bytes = 0;
- window = 0L;
- done = false;
- c = -1;
-
- /* Read until we finish the image */
- ypos = 0;
- for (i = 0; i < rows; i++) {
- for (xpos = 0; xpos < len;) {
-
- if (top_idx == 0) {
- /* Bummer -- our stack is empty. Now we have to work! */
- code = getCode(codeSize);
- if (code < 0) return;
-
- if (code > maxCode || code == endCode) return;
- if (code == clearCode) {
- codeSize = initialCodeSize + 1;
- maxCode = clearCode + 2;
- oldCode = -1;
- continue;
- }
-
- // Last pass reset the decoder, so the first code we
- // see must be a singleton. Seed the stack with it,
- // and set up the old/first code pointers for
- // insertion into the string table. We can't just
- // roll this into the clearCode test above, because
- // at that point we have not yet read the next code.
- if (oldCode == -1) {
- stack[top_idx++] = append[code];
- oldCode = code;
- firstCode = code;
- continue;
- }
-
- inCode = code;
-
- // maxCode is always one bigger than our
- // highest assigned code. If the code we see
- // is equal to maxCode, then we are about to
- // add a new string to the table. ???
- if (code == maxCode) {
- stack[top_idx++] = firstCode;
- code = oldCode;
- }
-
- // Populate the stack by tracing the string in the
- // string table from its tail to its head
- while (code > clearCode) {
- stack[top_idx++] = append[code];
- code = prefix[code];
- }
- firstCode = append[code];
-
- // If there's no more room in our string table, quit.
- // Otherwise, add a new string to the table
- if (maxCode >= (1 << MAX_LWZ_BITS)) return;
-
- // Push the head of the string onto the stack
- stack[top_idx++] = firstCode;
-
- // Add a new string to the string table
- prefix[maxCode] = oldCode;
- append[maxCode] = firstCode;
- maxCode++;
-
- // maxCode tells us the maximum code value we can accept.
- // If we see that we need more bits to represent it than
- // we are requesting from the unpacker, we need to increase
- // the number we ask for.
- if ((maxCode >= (1 << codeSize)) && (maxCode < (1<<MAX_LWZ_BITS))) codeSize++;
- oldCode = inCode;
- }
-
- // Pop the next color index off the stack
- v = stack[--top_idx];
- if (v < 0) return;
-
- // Finally, we can set a pixel! Joy!
- data[xpos + ypos * width] = cmap[v];
- xpos++;
- }
-
- // If interlacing, the next ypos is not just +1
- if (interlaced) {
- ypos += _interlaceStep[pass];
- while (ypos >= rows) {
- pass++;
- if (pass > 3) return;
- ypos = _interlaceStart[pass];
- }
- } else ypos++;
- }
- return;
- }
-
- /** Extract the next compression code from the file. */
- private int getCode(int code_size) throws IOException {
- int ret;
-
- while (bitsInWindow < code_size) {
- // Not enough bits in our window to cover the request
- if (done) return -1;
-
- if (bytes == 0) {
- // Not enough bytes in our buffer to add to the window
- bytes = getDataBlock();
- c = 0;
- if (bytes <= 0) {
- done = true;
- break;
- }
- }
- // Tack another byte onto the window, see if that's enough
- window += (_buf[c]) << bitsInWindow;
- ++c;
- bitsInWindow += 8;
- bytes--;
- }
-
-
- // The next code will always be the last code_size bits of the window
- ret = ((int)window) & ((1 << code_size) - 1);
-
- // Shift data in the window to put the next code at the end
- window >>= code_size;
- bitsInWindow -= code_size;
- return ret;
- }
-
- /** Read the global image descriptor and optional global color map. Sets global_* variables. */
- private boolean readGlobalImageDescriptor() throws IOException {
- int packed;
- int aspect; // we ignore this.
- int ofs;
-
- if (!readIntoBuf(7) ) return false;
- global_width = _buf[0] | (_buf[1] << 8);
- global_height = _buf[2] | (_buf[3] << 8);
- packed = _buf[4];
- global_bgcolor = _buf[5];
- aspect = _buf[6];
- global_cmapsize = 2 << (packed & 0x07);
- global_hascmap = (packed & GLOBALCOLORMAP) == GLOBALCOLORMAP;
- global_color_map = null;
-
- // Read the color map, if we have one.
- if (global_hascmap) {
- if (!readColorMap(global_cmapsize,true)) {
- return false;
- }
- }
-
- return true;
- }
-
- /** Read a local image descriptor and optional local color map. */
- private boolean readLocalImageDescriptor() throws IOException {
- int packed;
-
- if (!readIntoBuf(9) ) return false;
-
- left = _buf[0] | (_buf[1] << 8);
- top = _buf[2] | (_buf[3] << 8);
- width = _buf[4] | (_buf[5] << 8);
- height = _buf[6] | (_buf[7] << 8);
- packed = _buf[8];
- hascmap = (packed & LOCALCOLORMAP) == LOCALCOLORMAP;
- cmapsize = 2 << (packed & 0x07);
- interlaced = (packed & INTERLACE) == INTERLACE;
- color_map = null;
-
- // Read the local color table, if there is one.
- return !(hascmap && !readColorMap(cmapsize,false));
- }
-
- /** Read a color map (global or local). */
- private boolean readColorMap(int nColors, boolean isGlobal)
- throws IOException {
- int[] map = new int[nColors];
- for( int i=0; i < nColors; ++i) {
- if (!readIntoBuf(3) ) return false;
- map[i] = (_buf[0] << 16) | (_buf[1] << 8) | _buf[2] | 0xFF000000;
- }
- if (isGlobal) global_color_map = map;
- else color_map = map;
- return true;
- }
-
- /** Read the contents of a GIF89a Graphical Extension Block. */
- private boolean readExtensionBlock() throws IOException {
- if (!readIntoBuf(1) ) return false;
- int label = _buf[0];
- int count = -1;
- switch (label) {
- case 0x01: // Plain Text Extension
- case 0xff: // Application Extension
- case 0xfe: // Comment Extension
- break;
- case 0xf9: // Graphic Control Extension
- count = getDataBlock();
- if (count < 0) return true;
- // Check for transparency setting.
- if ((_buf[0] & HASTRANSPARENCY) != 0) trans_idx = _buf[3];
- else trans_idx = -1;
- }
- do { count = getDataBlock(); } while (count > 0);
- return true;
- }
-
- /** Read a block of data from the GIF file. */
- private int getDataBlock() throws IOException {
- if (!readIntoBuf(1) ) return -1;
- int count = _buf[0];
- if (count != 0) if (!readIntoBuf(count) ) return -1;
- return count;
- }
-
- /** Read the indicated number of bytes into _buf, our instance-wide buffer. */
- private boolean readIntoBuf(int count) throws IOException {
- for(int i = 0; i < count; i++) if ((_buf[i] = _in.read()) == -1) return false;
- return true;
- }
-
- // Private Data //////////////////////////////////////////////////////////
-
- // State management stuff
- private int index = -1;
- private BufferedInputStream _in = null;
- private int[] _buf = new int[BUFSIZE];
-
- // Transparency settings
- private int trans_idx = -1;
-
- // Global image descriptor contents
- private int global_width = 0;
- private int global_height = 0;
- private int global_bgcolor = 0;
- private int global_cmapsize = 0;
- private boolean global_hascmap = false;
- private int[] global_color_map = null;
-
- // Local image descriptor contents
- private int left = 0;
- private int top = 0;
- private int width = 0;
- private int height = 0;
- private int cmapsize = 0;
- private boolean hascmap = false;
- private boolean interlaced = false;
- private int[] color_map = null;
-
- // Variables used in getCode(...) to track sliding bit-window.
- private int bytes = 0;
- private boolean done;
- private int c;
- private long window;
- private int bitsInWindow = 0;
-
- // Class-wide constants.
- private static final int INTERLACE = 0x40;
- private static final int GLOBALCOLORMAP = 0x80;
- private static final int LOCALCOLORMAP = 0x80;
- private static final int HASTRANSPARENCY = 0x01;
- private static final int MAX_LWZ_BITS = 12;
- private static final int BUFSIZE = 280;
- private static final int[] _interlaceStep = { 8, 8, 4, 2 };
- private static final int[] _interlaceStart = { 0, 4, 2, 1 };
-}
-
-
-
+++ /dev/null
-/*
- * This file was adapted from Jason Marshall's PNGImageProducer.java
- *
- * Copyright (c) 1997, Jason Marshall. All Rights Reserved
- *
- * The author makes no representations or warranties regarding the suitability,
- * reliability or stability of this code. This code is provided AS IS. The
- * author shall not be liable for any damages suffered as a result of using,
- * modifying or redistributing this software or any derivitives thereof.
- * Permission to use, reproduce, modify and/or (re)distribute this software is
- * hereby granted.
- */
-
-package org.xwt;
-
-import org.xwt.util.*;
-import java.io.*;
-import java.util.Hashtable;
-import java.util.Vector;
-import java.util.Enumeration;
-import java.util.zip.*;
-
-/** Converts an InputStream carrying a PNG image into an ARGB int[] */
-public class PNG extends ImageDecoder {
-
- // Public Methods ///////////////////////////////////////////////////////////////////////////////
-
- /** returns the ARGB int[] representing the last image processed */
- public final int[] getData() { return data; }
-
- /** returns the width of the last image processed */
- public final int getWidth() { return width; }
-
- /** returns the height of the last image processed */
- public final int getHeight() { return height; }
-
- /** process a PNG as an inputstream; returns null if there is an error
- @param name A string describing the image, to be used when logging errors
- */
- public static PNG decode(InputStream is, String name) {
- try {
- return new PNG(is, name);
- } catch (Exception e) {
- if (Log.on) Log.log(PNG.class, e);
- return null;
- }
- }
-
- private PNG(InputStream is, String name) throws IOException {
- underlyingStream = is;
- target_offset = 0;
- inputStream = new DataInputStream(underlyingStream);
-
- // consume the header
- if ((inputStream.read() != 137) || (inputStream.read() != 80) || (inputStream.read() != 78) || (inputStream.read() != 71) ||
- (inputStream.read() != 13) || (inputStream.read() != 10) || (inputStream.read() != 26) || (inputStream.read() != 10)) {
- Log.log(this, "PNG: error: input file " + name + " is not a PNG file");
- data = new int[] { };
- width = height = 0;
- return;
- }
-
- DONE: while (!error) {
- if (needChunkInfo) {
- chunkLength = inputStream.readInt();
- chunkType = inputStream.readInt();
- needChunkInfo = false;
- }
-
- switch (chunkType) {
- case CHUNK_bKGD: inputStream.skip(chunkLength); break;
- case CHUNK_cHRM: inputStream.skip(chunkLength); break;
- case CHUNK_gAMA: inputStream.skip(chunkLength); break;
- case CHUNK_hIST: inputStream.skip(chunkLength); break;
- case CHUNK_pHYs: inputStream.skip(chunkLength); break;
- case CHUNK_sBIT: inputStream.skip(chunkLength); break;
- case CHUNK_tEXt: inputStream.skip(chunkLength); break;
- case CHUNK_zTXt: inputStream.skip(chunkLength); break;
- case CHUNK_tIME: inputStream.skip(chunkLength); break;
-
- case CHUNK_IHDR: handleIHDR(); break;
- case CHUNK_PLTE: handlePLTE(); break;
- case CHUNK_tRNS: handletRNS(); break;
-
- case CHUNK_IDAT: handleIDAT(); break;
-
- case CHUNK_IEND: break DONE;
- default:
- System.err.println("unrecognized chunk type " +
- Integer.toHexString(chunkType) + ". skipping");
- inputStream.skip(chunkLength);
- }
-
- int crc = inputStream.readInt();
- needChunkInfo = true;
- }
- }
-
- // Chunk Handlers ///////////////////////////////////////////////////////////////////////
-
- /** handle data chunk */
- private void handleIDAT() throws IOException {
- if (width == -1 || height == -1) throw new IOException("never got image width/height");
- switch (depth) {
- case 1: mask = 0x1; break;
- case 2: mask = 0x3; break;
- case 4: mask = 0xf; break;
- case 8: case 16: mask = 0xff; break;
- default: mask = 0x0; break;
- }
- if (depth < 8) smask = mask << depth;
- else smask = mask << 8;
-
- int count = width * height;
-
- switch (colorType) {
- case 0:
- case 2:
- case 6:
- case 4:
- ipixels = new int[count];
- pixels = ipixels;
- break;
- case 3:
- bpixels = new byte[count];
- pixels = bpixels;
- break;
- default:
- throw new IOException("Image has unknown color type");
- }
- if (interlaceMethod != 0) multipass = true;
- readImageData();
- }
-
- /** handle header chunk */
- private void handleIHDR() throws IOException {
- if (headerFound) throw new IOException("Extraneous IHDR chunk encountered.");
- if (chunkLength != 13) throw new IOException("IHDR chunk length wrong: " + chunkLength);
- width = inputStream.readInt();
- height = inputStream.readInt();
- depth = inputStream.read();
- colorType = inputStream.read();
- compressionMethod = inputStream.read();
- filterMethod = inputStream.read();
- interlaceMethod = inputStream.read();
- }
-
- /** handle pallette chunk */
- private void handlePLTE() throws IOException {
- if (colorType == 3) {
- palette = new byte[chunkLength];
- inputStream.readFully(palette);
- } else {
- // Ignore suggested palette
- inputStream.skip(chunkLength);
- }
- }
-
- /** handle transparency chunk; modifies palette */
- private void handletRNS() throws IOException {
- int chunkLen = chunkLength;
- if (palette == null) {
- if (Log.on) Log.log(this, "warning: tRNS chunk encountered before pLTE; ignoring alpha channel");
- inputStream.skip(chunkLength);
- return;
- }
- int len = palette.length;
- if (colorType == 3) {
- transparency = true;
-
- int transLength = len/3;
- byte[] trans = new byte[transLength];
- for (int i = 0; i < transLength; i++) trans[i] = (byte) 0xff;
- inputStream.readFully(trans, 0, chunkLength);
-
- byte[] newPalette = new byte[len + transLength];
- for (int i = newPalette.length; i > 0;) {
- newPalette[--i] = trans[--transLength];
- newPalette[--i] = palette[--len];
- newPalette[--i] = palette[--len];
- newPalette[--i] = palette[--len];
- }
- palette = newPalette;
-
- } else {
- inputStream.skip(chunkLength);
- }
- }
-
- /// Helper functions for IDAT ///////////////////////////////////////////////////////////////////////////////////////////
-
- /** Read Image data in off of a compression stream */
- private void readImageData() throws IOException {
- InputStream dataStream = new SequenceInputStream(new IDATEnumeration(this));
- DataInputStream dis = new DataInputStream(new BufferedInputStream(new InflaterInputStream(dataStream, new Inflater())));
- int bps, filterOffset;
- switch (colorType) {
- case 0: case 3: bps = depth; break;
- case 2: bps = 3 * depth; break;
- case 4: bps = depth<<1; break;
- case 6: bps = depth<<2; break;
- default: throw new IOException("Unknown color type encountered.");
- }
-
- filterOffset = (bps + 7) >> 3;
-
- for (pass = (multipass ? 1 : 0); pass < 8; pass++) {
- int pass = this.pass;
- int rInc = rowInc[pass];
- int cInc = colInc[pass];
- int sCol = startingCol[pass];
- int val = (width - sCol + cInc - 1) / cInc;
- int samples = val * filterOffset;
- int rowSize = (val * bps)>>3;
- int sRow = startingRow[pass];
- if (height <= sRow || rowSize == 0) continue;
- int sInc = rInc * width;
- byte inbuf[] = new byte[rowSize];
- int pix[] = new int[rowSize];
- int upix[] = null;
- int temp[] = new int[rowSize];
- int nextY = sRow; // next Y value and number of rows to report to sendPixels
- int rows = 0;
- int rowStart = sRow * width;
-
- for (int y = sRow; y < height; y += rInc, rowStart += sInc) {
- rows += rInc;
- int rowFilter = dis.read();
- dis.readFully(inbuf);
- if (!filterRow(inbuf, pix, upix, rowFilter, filterOffset)) throw new IOException("Unknown filter type: " + rowFilter);
- insertPixels(pix, rowStart + sCol, samples);
- if (multipass && (pass < 6)) blockFill(rowStart);
- upix = pix;
- pix = temp;
- temp = upix;
- }
- if (!multipass) break;
- }
- while(dis.read() != -1) System.err.println("Leftover data encountered.");
-
- // 24-bit color is our native format
- if (colorType == 2 || colorType == 6) {
- data = (int[])pixels;
- if (colorType == 2) {
- for(int i=0; i<data.length; i++)
- data[i] |= 0xFF000000;
- }
-
- } else if (colorType == 3) {
- byte[] pix = (byte[])pixels;
- data = new int[pix.length];
- for(int i=0; i<pix.length; i++) {
- if (transparency) {
- data[i] =
- ((palette[4 * (pix[i] & 0xff) + 3] & 0xff) << 24) |
- ((palette[4 * (pix[i] & 0xff) + 0] & 0xff) << 16) |
- ((palette[4 * (pix[i] & 0xff) + 1] & 0xff) << 8) |
- (palette[4 * (pix[i] & 0xff) + 2] & 0xff);
- } else {
- data[i] =
- 0xFF000000 |
- ((palette[3 * (pix[i] & 0xff) + 0] & 0xff) << 16) |
- ((palette[3 * (pix[i] & 0xff) + 1] & 0xff) << 8) |
- (palette[3 * (pix[i] & 0xff) + 2] & 0xff);
- }
- }
-
- } else if (colorType == 0 || colorType == 4) {
- if (depth == 16) depth = 8;
- int[] pix = (int[])pixels;
- data = new int[pix.length];
- for(int i=0; i<pix.length; i ++) {
- if (colorType == 0) {
- int val = (pix[i] & 0xff) << (8 - depth);
- data[i] =
- 0xFF000000 |
- (val << 16) |
- (val << 8) |
- val;
- } else {
- int alpha = (pix[i] & mask) << (8 - depth);
- int val = ((pix[i] & smask) >> depth) << (8 - depth);
- data[i] =
- (alpha << 24) |
- (val << 16) |
- (val << 8) |
- val;
- }
- }
- }
-
- }
-
- private void insertGreyPixels(int pix[], int offset, int samples) {
- int p = pix[0];
- int ipix[] = ipixels;
- int cInc = colInc[pass];
- int rs = 0;
-
- if (colorType == 0) {
- switch (depth) {
- case 1:
- for (int j = 0; j < samples; j++, offset += cInc) {
- if (rs != 0) rs--;
- else { rs = 7; p = pix[j>>3]; }
- ipix[offset] = (p>>rs) & 0x1;
- }
- break;
- case 2:
- for (int j = 0; j < samples; j++, offset += cInc) {
- if (rs != 0) rs -= 2;
- else { rs = 6; p = pix[j>>2]; }
- ipix[offset] = (p>>rs) & 0x3;
- }
- break;
- case 4:
- for (int j = 0; j < samples; j++, offset += cInc) {
- if (rs != 0) rs = 0;
- else { rs = 4; p = pix[j>>1]; }
- ipix[offset] = (p>>rs) & 0xf;
- }
- break;
- case 8:
- for (int j = 0; j < samples; offset += cInc) ipix[offset] = (byte) pix[j++];
- break;
- case 16:
- samples = samples<<1;
- for (int j = 0; j < samples; j += 2, offset += cInc) ipix[offset] = pix[j];
- break;
- default: break;
- }
- } else if (colorType == 4) {
- if (depth == 8) {
- for (int j = 0; j < samples; offset += cInc) ipix[offset] = (pix[j++]<<8) | pix[j++];
- } else {
- samples = samples<<1;
- for (int j = 0; j < samples; j += 2, offset += cInc) ipix[offset] = (pix[j]<<8) | pix[j+=2];
- }
- }
- }
-
- private void insertPalettedPixels(int pix[], int offset, int samples) {
- int rs = 0;
- int p = pix[0];
- byte bpix[] = bpixels;
- int cInc = colInc[pass];
-
- switch (depth) {
- case 1:
- for (int j = 0; j < samples; j++, offset += cInc) {
- if (rs != 0) rs--;
- else { rs = 7; p = pix[j>>3]; }
- bpix[offset] = (byte) ((p>>rs) & 0x1);
- }
- break;
- case 2:
- for (int j = 0; j < samples; j++, offset += cInc) {
- if (rs != 0) rs -= 2;
- else { rs = 6; p = pix[j>>2]; }
- bpix[offset] = (byte) ((p>>rs) & 0x3);
- }
- break;
- case 4:
- for (int j = 0; j < samples; j++, offset += cInc) {
- if (rs != 0) rs = 0;
- else { rs = 4; p = pix[j>>1]; }
- bpix[offset] = (byte) ((p>>rs) & 0xf);
- }
- break;
- case 8:
- for (int j = 0; j < samples; j++, offset += cInc) bpix[offset] = (byte) pix[j];
- break;
- }
- }
-
- private void insertPixels(int pix[], int offset, int samples) {
- switch (colorType) {
- case 0:
- case 4:
- insertGreyPixels(pix, offset, samples);
- break;
- case 2: {
- int j = 0;
- int ipix[] = ipixels;
- int cInc = colInc[pass];
- if (depth == 8) {
- for (j = 0; j < samples; offset += cInc)
- ipix[offset] = (pix[j++]<<16) | (pix[j++]<<8) | pix[j++];
- } else {
- samples = samples<<1;
- for (j = 0; j < samples; j += 2, offset += cInc)
- ipix[offset] = (pix[j]<<16) | (pix[j+=2]<<8) | pix[j+=2];
- }
- break; }
- case 3:
- insertPalettedPixels(pix, offset, samples);
- break;
- case 6: {
- int j = 0;
- int ipix[] = ipixels;
- int cInc = colInc[pass];
- if (depth == 8) {
- for (j = 0; j < samples; offset += cInc) {
- ipix[offset] = (pix[j++]<<16) | (pix[j++]<<8) | pix[j++] |
- (pix[j++]<<24);
- }
- } else {
- samples = samples<<1;
- for (j = 0; j < samples; j += 2, offset += cInc) {
- ipix[offset] = (pix[j]<<16) | (pix[j+=2]<<8) | pix[j+=2] |
- (pix[j+=2]<<24);
- }
- }
- break; }
- default:
- break;
- }
- }
-
- private void blockFill(int rowStart) {
- int counter;
- int dw = width;
- int pass = this.pass;
- int w = blockWidth[pass];
- int sCol = startingCol[pass];
- int cInc = colInc[pass];
- int wInc = cInc - w;
- int maxW = rowStart + dw - w;
- int len;
- int h = blockHeight[pass];
- int maxH = rowStart + (dw * h);
- int startPos = rowStart + sCol;
- counter = startPos;
-
- if (colorType == 3) {
- byte bpix[] = bpixels;
- byte pixel;
- len = bpix.length;
- for (; counter <= maxW;) {
- int end = counter + w;
- pixel = bpix[counter++];
- for (; counter < end; counter++) bpix[counter] = pixel;
- counter += wInc;
- }
- maxW += w;
- if (counter < maxW)
- for (pixel = bpix[counter++]; counter < maxW; counter++)
- bpix[counter] = pixel;
- if (len < maxH) maxH = len;
- for (counter = startPos + dw; counter < maxH; counter += dw)
- System.arraycopy(bpix, startPos, bpix, counter, dw - sCol);
- } else {
- int ipix[] = ipixels;
- int pixel;
- len = ipix.length;
- for (; counter <= maxW;) {
- int end = counter + w;
- pixel = ipix[counter++];
- for (; counter < end; counter++)
- ipix[counter] = pixel;
- counter += wInc;
- }
- maxW += w;
- if (counter < maxW)
- for (pixel = ipix[counter++]; counter < maxW; counter++)
- ipix[counter] = pixel;
- if (len < maxH) maxH = len;
- for (counter = startPos + dw; counter < maxH; counter += dw)
- System.arraycopy(ipix, startPos, ipix, counter, dw - sCol);
- }
- }
-
- private boolean filterRow(byte inbuf[], int pix[], int upix[], int rowFilter, int boff) {
- int rowWidth = pix.length;
- switch (rowFilter) {
- case 0: {
- for (int x = 0; x < rowWidth; x++) pix[x] = 0xff & inbuf[x];
- break; }
- case 1: {
- int x = 0;
- for ( ; x < boff; x++) pix[x] = 0xff & inbuf[x];
- for ( ; x < rowWidth; x++) pix[x] = 0xff & (inbuf[x] + pix[x - boff]);
- break; }
- case 2: {
- if (upix != null) {
- for (int x = 0; x < rowWidth; x++)
- pix[x] = 0xff & (upix[x] + inbuf[x]);
- } else {
- for (int x = 0; x < rowWidth; x++)
- pix[x] = 0xff & inbuf[x];
- }
- break; }
- case 3: {
- if (upix != null) {
- int x = 0;
- for ( ; x < boff; x++) {
- int rval = upix[x];
- pix[x] = 0xff & ((rval>>1) + inbuf[x]);
- }
- for ( ; x < rowWidth; x++) {
- int rval = upix[x] + pix[x - boff];
- pix[x] = 0xff & ((rval>>1) + inbuf[x]);
- }
- } else {
- int x = 0;
- for ( ; x < boff; x++) pix[x] = 0xff & inbuf[x];
- for ( ; x < rowWidth; x++) {
- int rval = pix[x - boff];
- pix[x] = 0xff & ((rval>>1) + inbuf[x]);
- }
- }
- break; }
- case 4: {
- if (upix != null) {
- int x = 0;
- for ( ; x < boff; x++) pix[x] = 0xff & (upix[x] + inbuf[x]);
- for ( ; x < rowWidth; x++) {
- int a, b, c, p, pa, pb, pc, rval;
- a = pix[x - boff];
- b = upix[x];
- c = upix[x - boff];
- p = a + b - c;
- pa = p > a ? p - a : a - p;
- pb = p > b ? p - b : b - p;
- pc = p > c ? p - c : c - p;
- if ((pa <= pb) && (pa <= pc)) rval = a;
- else if (pb <= pc) rval = b;
- else rval = c;
- pix[x] = 0xff & (rval + inbuf[x]);
- }
- } else {
- int x = 0;
- for ( ; x < boff; x++) pix[x] = 0xff & inbuf[x];
- for ( ; x < rowWidth; x++) {
- int rval = pix[x - boff];
- pix[x] = 0xff & (rval + inbuf[x]);
- }
- }
- break; }
- default: return false;
- }
- return true;
- }
-
- // Private Data ///////////////////////////////////////////////////////////////////////////////////////
-
- private int target_offset = 0;
- private int width = -1;
- private int height = -1;
- private int sigmask = 0xffff;
- private Object pixels = null;
- private int ipixels[] = null;
- private byte bpixels[] = null;
- private boolean multipass = false;
- private boolean complete = false;
- private boolean error = false;
-
- private int[] data = null;
-
- private InputStream underlyingStream = null;
- private DataInputStream inputStream = null;
- private Thread controlThread = null;
- private boolean infoAvailable = false;
- private int updateDelay = 750;
-
- // Image decoding state variables
- private boolean headerFound = false;
- private int compressionMethod = -1;
- private int depth = -1;
- private int colorType = -1;
- private int filterMethod = -1;
- private int interlaceMethod = -1;
- private int pass = 0;
- private byte palette[] = null;
- private int mask = 0x0;
- private int smask = 0x0;
- private boolean transparency = false;
-
- private int chunkLength = 0;
- private int chunkType = 0;
- private boolean needChunkInfo = true;
-
- private static final int CHUNK_bKGD = 0x624B4744; // "bKGD"
- private static final int CHUNK_cHRM = 0x6348524D; // "cHRM"
- private static final int CHUNK_gAMA = 0x67414D41; // "gAMA"
- private static final int CHUNK_hIST = 0x68495354; // "hIST"
- private static final int CHUNK_IDAT = 0x49444154; // "IDAT"
- private static final int CHUNK_IEND = 0x49454E44; // "IEND"
- private static final int CHUNK_IHDR = 0x49484452; // "IHDR"
- private static final int CHUNK_PLTE = 0x504C5445; // "PLTE"
- private static final int CHUNK_pHYs = 0x70485973; // "pHYs"
- private static final int CHUNK_sBIT = 0x73424954; // "sBIT"
- private static final int CHUNK_tEXt = 0x74455874; // "tEXt"
- private static final int CHUNK_tIME = 0x74494D45; // "tIME"
- private static final int CHUNK_tRNS = 0x74524E53; // "tIME"
- private static final int CHUNK_zTXt = 0x7A545874; // "zTXt"
-
- private static final int startingRow[] = { 0, 0, 0, 4, 0, 2, 0, 1 };
- private static final int startingCol[] = { 0, 0, 4, 0, 2, 0, 1, 0 };
- private static final int rowInc[] = { 1, 8, 8, 8, 4, 4, 2, 2 };
- private static final int colInc[] = { 1, 8, 8, 4, 4, 2, 2, 1 };
- private static final int blockHeight[] = { 1, 8, 8, 4, 4, 2, 2, 1 };
- private static final int blockWidth[] = { 1, 8, 4, 4, 2, 2, 1, 1 };
-
- // Helper Classes ////////////////////////////////////////////////////////////////////
-
- private static class MeteredInputStream extends FilterInputStream {
- int bytesLeft;
- int marked;
-
- public MeteredInputStream(InputStream in, int size) {
- super(in);
- bytesLeft = size;
- }
-
- public final int read() throws IOException {
- if (bytesLeft > 0) {
- int val = in.read();
- if (val != -1) bytesLeft--;
- return val;
- }
- return -1;
- }
-
- public final int read(byte b[]) throws IOException {
- return read(b, 0, b.length);
- }
-
- public final int read(byte b[], int off, int len) throws IOException {
- if (bytesLeft > 0) {
- len = (len > bytesLeft ? bytesLeft : len);
- int read = in.read(b, off, len);
- if (read > 0) bytesLeft -= read;
- return read;
- }
- return -1;
- }
-
- public final long skip(long n) throws IOException {
- n = (n > bytesLeft ? bytesLeft : n);
- long skipped = in.skip(n);
- if (skipped > 0) bytesLeft -= skipped;
- return skipped;
- }
-
- public final int available() throws IOException {
- int n = in.available();
- return (n > bytesLeft ? bytesLeft : n);
- }
-
- public final void close() throws IOException { /* Eat this */ }
-
- public final void mark(int readlimit) {
- marked = bytesLeft;
- in.mark(readlimit);
- }
-
- public final void reset() throws IOException {
- in.reset();
- bytesLeft = marked;
- }
-
- public final boolean markSupported() { return in.markSupported(); }
- }
-
- /** Support class, used to eat the IDAT headers dividing up the deflated stream */
- private static class IDATEnumeration implements Enumeration {
- InputStream underlyingStream;
- PNG owner;
- boolean firstStream = true;
-
- public IDATEnumeration(PNG owner) {
- this.owner = owner;
- this.underlyingStream = owner.underlyingStream;
- }
-
- public Object nextElement() {
- firstStream = false;
- return new MeteredInputStream(underlyingStream, owner.chunkLength);
- }
-
- public boolean hasMoreElements() {
- DataInputStream dis = new DataInputStream(underlyingStream);
- if (!firstStream) {
- try {
- int crc = dis.readInt();
- owner.needChunkInfo = false;
- owner.chunkLength = dis.readInt();
- owner.chunkType = dis.readInt();
- } catch (IOException ioe) {
- return false;
- }
- }
- if (owner.chunkType == PNG.CHUNK_IDAT) return true;
- return false;
- }
- }
-
-}
projects / org.ibex.core.git / commitdiff