diff options
Diffstat (limited to 'src/main/java/com/lowagie/text/pdf/codec/GifImage.java')
| -rw-r--r-- | src/main/java/com/lowagie/text/pdf/codec/GifImage.java | 593 |
1 files changed, 0 insertions, 593 deletions
diff --git a/src/main/java/com/lowagie/text/pdf/codec/GifImage.java b/src/main/java/com/lowagie/text/pdf/codec/GifImage.java deleted file mode 100644 index f6858ac..0000000 --- a/src/main/java/com/lowagie/text/pdf/codec/GifImage.java +++ /dev/null @@ -1,593 +0,0 @@ -/*
- * Copyright 2003 by Paulo Soares.
- *
- * The contents of this file are subject to the Mozilla Public License Version 1.1
- * (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.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the License.
- *
- * The Original Code is 'iText, a free JAVA-PDF library'.
- *
- * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
- * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
- * All Rights Reserved.
- * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
- * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
- *
- * Contributor(s): all the names of the contributors are added in the source code
- * where applicable.
- *
- * Alternatively, the contents of this file may be used under the terms of the
- * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
- * provisions of LGPL are applicable instead of those above. If you wish to
- * allow use of your version of this file only under the terms of the LGPL
- * License and not to allow others to use your version of this file under
- * the MPL, indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by the LGPL.
- * If you do not delete the provisions above, a recipient may use your version
- * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
- *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the MPL as stated above or under the terms of the GNU
- * Library General Public License as published by the Free Software Foundation;
- * either version 2 of the License, or 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 Library general Public License for more
- * details.
- *
- * If you didn't download this code from the following link, you should check if
- * you aren't using an obsolete version:
- * http://www.lowagie.com/iText/
- */
-package com.lowagie.text.pdf.codec;
-
-import com.lowagie.text.pdf.*;
-import com.lowagie.text.*;
-import java.io.*;
-import java.net.URL;
-import java.util.ArrayList;
-
-/** Reads gif images of all types. All the images in a gif are read in the constructors
- * and can be retrieved with other methods.
- * @author Paulo Soares (psoares@consiste.pt)
- */
-public class GifImage {
-
- protected DataInputStream in;
- protected int width; // full image width
- protected int height; // full image height
- protected boolean gctFlag; // global color table used
-
- protected int bgIndex; // background color index
- protected int bgColor; // background color
- protected int pixelAspect; // pixel aspect ratio
-
- protected boolean lctFlag; // local color table flag
- protected boolean interlace; // interlace flag
- protected int lctSize; // local color table size
-
- protected int ix, iy, iw, ih; // current image rectangle
-
- protected byte[] block = new byte[256]; // current data block
- protected int blockSize = 0; // block size
-
- // last graphic control extension info
- protected int dispose = 0; // 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
- protected boolean transparency = false; // use transparent color
- protected int delay = 0; // delay in milliseconds
- protected int transIndex; // transparent color index
-
- protected static final int MaxStackSize = 4096; // max decoder pixel stack size
-
- // LZW decoder working arrays
- protected short[] prefix;
- protected byte[] suffix;
- protected byte[] pixelStack;
- protected byte[] pixels;
-
- protected byte m_out[];
- protected int m_bpc;
- protected int m_gbpc;
- protected byte m_global_table[];
- protected byte m_local_table[];
- protected byte m_curr_table[];
- protected int m_line_stride;
- protected byte fromData[];
- protected URL fromUrl;
-
-
- protected ArrayList frames = new ArrayList(); // frames read from current file
-
- /** Reads gif images from an URL.
- * @param url the URL
- * @throws IOException on error
- */
- public GifImage(URL url) throws IOException {
- fromUrl = url;
- InputStream is = null;
- try {
- is = url.openStream();
- process(is);
- }
- finally {
- if (is != null) {
- is.close();
- }
- }
- }
-
- /** Reads gif images from a file.
- * @param file the file
- * @throws IOException on error
- */
- public GifImage(String file) throws IOException {
- this(Image.toURL(file));
- }
-
- /** Reads gif images from a byte array.
- * @param data the byte array
- * @throws IOException on error
- */
- public GifImage(byte data[]) throws IOException {
- fromData = data;
- InputStream is = null;
- try {
- is = new ByteArrayInputStream(data);
- process(is);
- }
- finally {
- if (is != null) {
- is.close();
- }
- }
- }
-
- /** Reads gif images from a stream. The stream is not closed.
- * @param is the stream
- * @throws IOException on error
- */
- public GifImage(InputStream is) throws IOException {
- process(is);
- }
-
- /** Gets the number of frames the gif has.
- * @return the number of frames the gif has
- */
- public int getFrameCount() {
- return frames.size();
- }
-
- /** Gets the image from a frame. The first frame is 1.
- * @param frame the frame to get the image from
- * @return the image
- */
- public Image getImage(int frame) {
- GifFrame gf = (GifFrame)frames.get(frame - 1);
- return gf.image;
- }
-
- /** Gets the [x,y] position of the frame in reference to the
- * logical screen.
- * @param frame the frame
- * @return the [x,y] position of the frame
- */
- public int[] getFramePosition(int frame) {
- GifFrame gf = (GifFrame)frames.get(frame - 1);
- return new int[]{gf.ix, gf.iy};
-
- }
-
- /** Gets the logical screen. The images may be smaller and placed
- * in some position in this screen to playback some animation.
- * No image will be be bigger that this.
- * @return the logical screen dimensions as [x,y]
- */
- public int[] getLogicalScreen() {
- return new int[]{width, height};
- }
-
- void process(InputStream is) throws IOException {
- in = new DataInputStream(new BufferedInputStream(is));
- readHeader();
- readContents();
- if (frames.size() == 0)
- throw new IOException("The file does not contain any valid image.");
- }
-
- /**
- * Reads GIF file header information.
- */
- protected void readHeader() throws IOException {
- String id = "";
- for (int i = 0; i < 6; i++)
- id += (char)in.read();
- if (!id.startsWith("GIF8")) {
- throw new IOException("Gif signature nor found.");
- }
-
- readLSD();
- if (gctFlag) {
- m_global_table = readColorTable(m_gbpc);
- }
- }
-
- /**
- * Reads Logical Screen Descriptor
- */
- protected void readLSD() throws IOException {
-
- // logical screen size
- width = readShort();
- height = readShort();
-
- // packed fields
- int packed = in.read();
- gctFlag = (packed & 0x80) != 0; // 1 : global color table flag
- m_gbpc = (packed & 7) + 1;
- bgIndex = in.read(); // background color index
- pixelAspect = in.read(); // pixel aspect ratio
- }
-
- /**
- * Reads next 16-bit value, LSB first
- */
- protected int readShort() throws IOException {
- // read 16-bit value, LSB first
- return in.read() | (in.read() << 8);
- }
-
- /**
- * Reads next variable length block from input.
- *
- * @return number of bytes stored in "buffer"
- */
- protected int readBlock() throws IOException {
- blockSize = in.read();
- if (blockSize <= 0)
- return blockSize = 0;
- for (int k = 0; k < blockSize; ++k) {
- int v = in.read();
- if (v < 0) {
- return blockSize = k;
- }
- block[k] = (byte)v;
- }
- return blockSize;
- }
-
- protected byte[] readColorTable(int bpc) throws IOException {
- int ncolors = 1 << bpc;
- int nbytes = 3*ncolors;
- bpc = newBpc(bpc);
- byte table[] = new byte[(1 << bpc) * 3];
- in.readFully(table, 0, nbytes);
- return table;
- }
-
-
- static protected int newBpc(int bpc) {
- switch (bpc) {
- case 1:
- case 2:
- case 4:
- break;
- case 3:
- return 4;
- default:
- return 8;
- }
- return bpc;
- }
-
- protected void readContents() throws IOException {
- // read GIF file content blocks
- boolean done = false;
- while (!done) {
- int code = in.read();
- switch (code) {
-
- case 0x2C: // image separator
- readImage();
- break;
-
- case 0x21: // extension
- code = in.read();
- switch (code) {
-
- case 0xf9: // graphics control extension
- readGraphicControlExt();
- break;
-
- case 0xff: // application extension
- readBlock();
- skip(); // don't care
- break;
-
- default: // uninteresting extension
- skip();
- }
- break;
-
- default:
- done = true;
- break;
- }
- }
- }
-
- /**
- * Reads next frame image
- */
- protected void readImage() throws IOException {
- ix = readShort(); // (sub)image position & size
- iy = readShort();
- iw = readShort();
- ih = readShort();
-
- int packed = in.read();
- lctFlag = (packed & 0x80) != 0; // 1 - local color table flag
- interlace = (packed & 0x40) != 0; // 2 - interlace flag
- // 3 - sort flag
- // 4-5 - reserved
- lctSize = 2 << (packed & 7); // 6-8 - local color table size
- m_bpc = newBpc(m_gbpc);
- if (lctFlag) {
- m_curr_table = readColorTable((packed & 7) + 1); // read table
- m_bpc = newBpc((packed & 7) + 1);
- }
- else {
- m_curr_table = m_global_table;
- }
- if (transparency && transIndex >= m_curr_table.length / 3)
- transparency = false;
- if (transparency && m_bpc == 1) { // Acrobat 5.05 doesn't like this combination
- byte tp[] = new byte[12];
- System.arraycopy(m_curr_table, 0, tp, 0, 6);
- m_curr_table = tp;
- m_bpc = 2;
- }
- boolean skipZero = decodeImageData(); // decode pixel data
- if (!skipZero)
- skip();
-
- Image img = null;
- try {
- img = new ImgRaw(iw, ih, 1, m_bpc, m_out);
- PdfArray colorspace = new PdfArray();
- colorspace.add(PdfName.INDEXED);
- colorspace.add(PdfName.DEVICERGB);
- int len = m_curr_table.length;
- colorspace.add(new PdfNumber(len / 3 - 1));
- colorspace.add(new PdfString(m_curr_table));
- PdfDictionary ad = new PdfDictionary();
- ad.put(PdfName.COLORSPACE, colorspace);
- img.setAdditional(ad);
- if (transparency) {
- img.setTransparency(new int[]{transIndex, transIndex});
- }
- }
- catch (Exception e) {
- throw new ExceptionConverter(e);
- }
- img.setOriginalType(Image.ORIGINAL_GIF);
- img.setOriginalData(fromData);
- img.setUrl(fromUrl);
- GifFrame gf = new GifFrame();
- gf.image = img;
- gf.ix = ix;
- gf.iy = iy;
- frames.add(gf); // add image to frame list
-
- //resetFrame();
-
- }
-
- protected boolean decodeImageData() throws IOException {
- int NullCode = -1;
- int npix = iw * ih;
- int available, clear, code_mask, code_size, end_of_information, in_code, old_code,
- bits, code, count, i, datum, data_size, first, top, bi;
- boolean skipZero = false;
-
- if (prefix == null)
- prefix = new short[MaxStackSize];
- if (suffix == null)
- suffix = new byte[MaxStackSize];
- if (pixelStack == null)
- pixelStack = new byte[MaxStackSize+1];
-
- m_line_stride = (iw * m_bpc + 7) / 8;
- m_out = new byte[m_line_stride * ih];
- int pass = 1;
- int inc = interlace ? 8 : 1;
- int line = 0;
- int xpos = 0;
-
- // Initialize GIF data stream decoder.
-
- data_size = in.read();
- clear = 1 << data_size;
- end_of_information = clear + 1;
- available = clear + 2;
- old_code = NullCode;
- code_size = data_size + 1;
- code_mask = (1 << code_size) - 1;
- for (code = 0; code < clear; code++) {
- prefix[code] = 0;
- suffix[code] = (byte) code;
- }
-
- // Decode GIF pixel stream.
-
- datum = bits = count = first = top = bi = 0;
-
- for (i = 0; i < npix; ) {
- if (top == 0) {
- if (bits < code_size) {
- // Load bytes until there are enough bits for a code.
- if (count == 0) {
- // Read a new data block.
- count = readBlock();
- if (count <= 0) {
- skipZero = true;
- break;
- }
- bi = 0;
- }
- datum += (((int) block[bi]) & 0xff) << bits;
- bits += 8;
- bi++;
- count--;
- continue;
- }
-
- // Get the next code.
-
- code = datum & code_mask;
- datum >>= code_size;
- bits -= code_size;
-
- // Interpret the code
-
- if ((code > available) || (code == end_of_information))
- break;
- if (code == clear) {
- // Reset decoder.
- code_size = data_size + 1;
- code_mask = (1 << code_size) - 1;
- available = clear + 2;
- old_code = NullCode;
- continue;
- }
- if (old_code == NullCode) {
- pixelStack[top++] = suffix[code];
- old_code = code;
- first = code;
- continue;
- }
- in_code = code;
- if (code == available) {
- pixelStack[top++] = (byte) first;
- code = old_code;
- }
- while (code > clear) {
- pixelStack[top++] = suffix[code];
- code = prefix[code];
- }
- first = ((int) suffix[code]) & 0xff;
-
- // Add a new string to the string table,
-
- if (available >= MaxStackSize)
- break;
- pixelStack[top++] = (byte) first;
- prefix[available] = (short) old_code;
- suffix[available] = (byte) first;
- available++;
- if (((available & code_mask) == 0) && (available < MaxStackSize)) {
- code_size++;
- code_mask += available;
- }
- old_code = in_code;
- }
-
- // Pop a pixel off the pixel stack.
-
- top--;
- i++;
-
- setPixel(xpos, line, pixelStack[top]);
- ++xpos;
- if (xpos >= iw) {
- xpos = 0;
- line += inc;
- if (line >= ih) {
- if (interlace) {
- do {
- pass++;
- switch (pass) {
- case 2:
- line = 4;
- break;
- case 3:
- line = 2;
- inc = 4;
- break;
- case 4:
- line = 1;
- inc = 2;
- break;
- default: // this shouldn't happen
- line = ih - 1;
- inc = 0;
- }
- } while (line >= ih);
- }
- else {
- line = ih - 1; // this shouldn't happen
- inc = 0;
- }
- }
- }
- }
- return skipZero;
- }
-
-
- protected void setPixel(int x, int y, int v) {
- if (m_bpc == 8) {
- int pos = x + iw * y;
- m_out[pos] = (byte)v;
- }
- else {
- int pos = m_line_stride * y + x / (8 / m_bpc);
- int vout = v << (8 - m_bpc * (x % (8 / m_bpc))- m_bpc);
- m_out[pos] |= vout;
- }
- }
-
- /**
- * Resets frame state for reading next image.
- */
- protected void resetFrame() {
- // it does nothing in the pdf context
- //boolean transparency = false;
- //int delay = 0;
- }
-
- /**
- * Reads Graphics Control Extension values
- */
- protected void readGraphicControlExt() throws IOException {
- in.read(); // block size
- int packed = in.read(); // packed fields
- dispose = (packed & 0x1c) >> 2; // disposal method
- if (dispose == 0)
- dispose = 1; // elect to keep old image if discretionary
- transparency = (packed & 1) != 0;
- delay = readShort() * 10; // delay in milliseconds
- transIndex = in.read(); // transparent color index
- in.read(); // block terminator
- }
-
- /**
- * Skips variable length blocks up to and including
- * next zero length block.
- */
- protected void skip() throws IOException {
- do {
- readBlock();
- } while (blockSize > 0);
- }
-
- static class GifFrame {
- Image image;
- int ix;
- int iy;
- }
-}
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