/j2se/JavaSE(LGame-0.3.2 &LAE-1.1)/LGame-0.3.2(OpenGL)/src/core/org/loon/framework/javase/game/action/sprite/GIFDecoder.java
Java | 607 lines | 500 code | 87 blank | 20 comment | 111 complexity | 4d92a4f53ef9f876d961a855681a5150 MD5 | raw file
- package org.loon.framework.javase.game.action.sprite;
-
- import java.awt.Color;
- import java.awt.Rectangle;
- import java.io.BufferedInputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.util.ArrayList;
-
- import org.loon.framework.javase.game.core.geom.RectBox;
- import org.loon.framework.javase.game.core.graphics.LImage;
- import org.loon.framework.javase.game.core.graphics.device.LGraphics;
- import org.loon.framework.javase.game.core.resource.Resources;
-
- /**
- * Copyright 2008 - 2009
- *
- * Licensed 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.
- *
- * @project loonframework
- * @author chenpeng
- * @email??šceponline@yahoo.com.cn
- * @version 0.1
- */
- class GIFDecoder {
-
- public static final int STATUS_OK = 0;
-
- public static final int STATUS_FORMAT_ERROR = 1;
-
- public static final int STATUS_OPEN_ERROR = 2;
-
- protected BufferedInputStream in;
-
- protected int status;
-
- protected int width, height;
-
- protected boolean gctFlag;
-
- protected int gctSize;
-
- protected int loopCount = 1;
-
- protected int[] gct, lct, act;
-
- protected int bgIndex, bgColor, lastBgColor, pixelAspect;
-
- protected boolean lctFlag;
-
- protected boolean interlace;
-
- protected int lctSize;
-
- protected int ix, iy, iw, ih;
-
- protected Rectangle lastRect;
-
- protected LImage image;
-
- protected LImage lastImage;
-
- protected byte[] block = new byte[256];
-
- protected int blockSize = 0;
-
- protected int dispose = 0;
-
- protected int lastDispose = 0;
-
- protected boolean transparency = false;
-
- protected int delay = 0;
-
- protected int transIndex;
-
- protected static final int MaxStackSize = 4096;
-
- protected short[] prefix;
-
- protected byte[] suffix;
-
- protected byte[] pixelStack;
-
- protected byte[] pixels;
-
- protected ArrayList<GifFrame> frames;
-
- protected int frameCount;
-
- static class GifFrame {
- public GifFrame(LImage im, int del) {
- image = im;
- delay = del;
- }
-
- public LImage image;
-
- public int delay;
- }
-
- public int getDelay(int n) {
- delay = -1;
- if ((n >= 0) && (n < frameCount)) {
- delay = ((GifFrame) frames.get(n)).delay;
- }
- return delay;
- }
-
- public int getFrameCount() {
- return frameCount;
- }
-
- public LImage getImage() {
- return getFrame(0);
- }
-
- public int getLoopCount() {
- return loopCount;
- }
-
- protected void setPixels() {
- int[] dest = image.getPixels();
- if (lastDispose > 0) {
- if (lastDispose == 3) {
- int n = frameCount - 2;
- if (n > 0) {
- lastImage = getFrame(n - 1);
- } else {
- lastImage = null;
- }
- }
- if (lastImage != null) {
- int[] prev = lastImage.getPixels();
- image.setPixels(prev, width, height);
- if (lastDispose == 2) {
- LGraphics g = image.getLGraphics();
- Color c = null;
- if (transparency) {
- c = new Color(0, 0, 0, 0);
- } else {
- c = new Color(lastBgColor);
- }
- g.setColor(c);
- g.fill(lastRect);
- g.dispose();
- }
- }
- }
- int pass = 1;
- int inc = 8;
- int iline = 0;
- for (int i = 0; i < ih; i++) {
- int line = i;
- if (interlace) {
- if (iline >= ih) {
- pass++;
- switch (pass) {
- case 2:
- iline = 4;
- break;
- case 3:
- iline = 2;
- inc = 4;
- break;
- case 4:
- iline = 1;
- inc = 2;
- }
- }
- line = iline;
- iline += inc;
- }
- line += iy;
- if (line < height) {
- int k = line * width;
- int dx = k + ix;
- int dlim = dx + iw;
- if ((k + width) < dlim) {
- dlim = k + width;
- }
- int sx = i * iw;
- while (dx < dlim) {
- int index = ((int) pixels[sx++]) & 0xff;
- int c = act[index];
- if (c != 0) {
- dest[dx] = c;
- }
- dx++;
- }
- }
- }
- image.setPixels(dest, width, height);
- }
-
- public LImage getFrame(int n) {
- LImage im = null;
- if ((n >= 0) && (n < frameCount)) {
- im = ((GifFrame) frames.get(n)).image;
- }
- return im;
- }
-
- public RectBox getFrameSize() {
- return new RectBox(0, 0, width, height);
- }
-
- public int read(BufferedInputStream is) {
- init();
- if (is != null) {
- in = is;
- readHeader();
- if (!err()) {
- readContents();
- if (frameCount < 0) {
- status = STATUS_FORMAT_ERROR;
- }
- }
- } else {
- status = STATUS_OPEN_ERROR;
- }
- try {
- is.close();
- } catch (IOException e) {
- }
- return status;
- }
-
- public int read(InputStream is) {
- init();
- if (is != null) {
- if (!(is instanceof BufferedInputStream)) {
- is = new BufferedInputStream(is);
- }
- in = (BufferedInputStream) is;
- readHeader();
- if (!err()) {
- readContents();
- if (frameCount < 0) {
- status = STATUS_FORMAT_ERROR;
- }
- }
- } else {
- status = STATUS_OPEN_ERROR;
- }
- try {
- is.close();
- } catch (IOException e) {
- }
- return status;
- }
-
- public int read(String fileName) {
- status = STATUS_OK;
- InputStream in = Resources.getResourceAsStream(fileName);
- if (in != null) {
- status = read(in);
- } else {
- status = STATUS_OPEN_ERROR;
- }
- return status;
- }
-
- protected void decodeImageData() {
- 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, pi;
-
- if ((pixels == null) || (pixels.length < npix)) {
- pixels = new byte[npix];
- }
- if (prefix == null)
- prefix = new short[MaxStackSize];
- if (suffix == null)
- suffix = new byte[MaxStackSize];
- if (pixelStack == null)
- pixelStack = new byte[MaxStackSize + 1];
- data_size = 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;
- }
-
- datum = bits = count = first = top = pi = bi = 0;
-
- for (i = 0; i < npix;) {
- if (top == 0) {
- if (bits < code_size) {
- if (count == 0) {
- count = readBlock();
- if (count <= 0)
- break;
- bi = 0;
- }
- datum += (((int) block[bi]) & 0xff) << bits;
- bits += 8;
- bi++;
- count--;
- continue;
- }
- code = datum & code_mask;
- datum >>= code_size;
- bits -= code_size;
- if ((code > available) || (code == end_of_information))
- break;
- if (code == clear) {
- 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;
- 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;
- }
- top--;
- pixels[pi++] = pixelStack[top];
- i++;
- }
-
- for (i = pi; i < npix; i++) {
- pixels[i] = 0;
- }
-
- }
-
- protected boolean err() {
- return status != STATUS_OK;
- }
-
- protected void init() {
- status = STATUS_OK;
- frameCount = 0;
- frames = new ArrayList<GifFrame>();
- gct = null;
- lct = null;
- }
-
- protected int read() {
- int curByte = 0;
- try {
- curByte = in.read();
- } catch (IOException e) {
- status = STATUS_FORMAT_ERROR;
- }
- return curByte;
- }
-
- protected int readBlock() {
- blockSize = read();
- int n = 0;
- if (blockSize > 0) {
- try {
- int count = 0;
- while (n < blockSize) {
- count = in.read(block, n, blockSize - n);
- if (count == -1)
- break;
- n += count;
- }
- } catch (IOException e) {
- }
-
- if (n < blockSize) {
- status = STATUS_FORMAT_ERROR;
- }
- }
- return n;
- }
-
- protected int[] readColorTable(int ncolors) {
- int nbytes = 3 * ncolors;
- int[] tab = null;
- byte[] c = new byte[nbytes];
- int n = 0;
- try {
- n = in.read(c);
- } catch (IOException e) {
- }
- if (n < nbytes) {
- status = STATUS_FORMAT_ERROR;
- } else {
- tab = new int[256];
- int i = 0;
- int j = 0;
- while (i < ncolors) {
- int r = ((int) c[j++]) & 0xff;
- int g = ((int) c[j++]) & 0xff;
- int b = ((int) c[j++]) & 0xff;
- tab[i++] = 0xff000000 | (r << 16) | (g << 8) | b;
- }
- }
- return tab;
- }
-
- protected void readContents() {
- boolean done = false;
- while (!(done || err())) {
- int code = read();
- switch (code) {
- case 0x2C:
- readImage();
- break;
- case 0x21:
- code = read();
- switch (code) {
- case 0xf9:
- readGraphicControlExt();
- break;
- case 0xff:
- readBlock();
- String app = "";
- for (int i = 0; i < 11; i++) {
- app += (char) block[i];
- }
- if (app.equals("NETSCAPE2.0")) {
- readNetscapeExt();
- } else
- skip();
- break;
- default:
- skip();
- }
- break;
-
- case 0x3b:
- done = true;
- break;
-
- case 0x00:
- break;
-
- default:
- status = STATUS_FORMAT_ERROR;
- }
- }
- }
-
- protected void readGraphicControlExt() {
- read();
- int packed = read();
- dispose = (packed & 0x1c) >> 2;
- if (dispose == 0) {
- dispose = 1;
- }
- transparency = (packed & 1) != 0;
- delay = readShort() * 10;
- transIndex = read();
- read();
- }
-
- protected void readHeader() {
- String id = "";
- for (int i = 0; i < 6; i++) {
- id += (char) read();
- }
- if (!id.startsWith("GIF")) {
- status = STATUS_FORMAT_ERROR;
- return;
- }
-
- readLSD();
- if (gctFlag && !err()) {
- gct = readColorTable(gctSize);
- bgColor = gct[bgIndex];
- }
- }
-
- protected void readImage() {
- ix = readShort();
- iy = readShort();
- iw = readShort();
- ih = readShort();
-
- int packed = read();
- lctFlag = (packed & 0x80) != 0;
- interlace = (packed & 0x40) != 0;
- lctSize = 2 << (packed & 7);
- if (lctFlag) {
- lct = readColorTable(lctSize);
- act = lct;
- } else {
- act = gct;
- if (bgIndex == transIndex)
- bgColor = 0;
- }
- int save = 0;
- if (transparency) {
- save = act[transIndex];
- act[transIndex] = 0;
- }
-
- if (act == null) {
- status = STATUS_FORMAT_ERROR;
- }
-
- if (err())
- return;
-
- decodeImageData();
- skip();
-
- if (err())
- return;
-
- frameCount++;
-
- image = new LImage(width, height, true);
-
- setPixels();
-
- frames.add(new GifFrame(image, delay));
-
- if (transparency) {
- act[transIndex] = save;
- }
- resetFrame();
-
- }
-
- protected void readLSD() {
- width = readShort();
- height = readShort();
-
- int packed = read();
- gctFlag = (packed & 0x80) != 0;
-
- gctSize = 2 << (packed & 7);
- bgIndex = read();
- pixelAspect = read();
- }
-
- protected void readNetscapeExt() {
- do {
- readBlock();
- if (block[0] == 1) {
- int b1 = ((int) block[1]) & 0xff;
- int b2 = ((int) block[2]) & 0xff;
- loopCount = (b2 << 8) | b1;
- }
- } while ((blockSize > 0) && !err());
- }
-
- protected int readShort() {
- return read() | (read() << 8);
- }
-
- protected void resetFrame() {
- lastDispose = dispose;
- lastRect = new Rectangle(ix, iy, iw, ih);
- lastImage = image;
- lastBgColor = bgColor;
- dispose = 0;
- transparency = false;
- delay = 0;
- lct = null;
- }
-
- protected void skip() {
- do {
- readBlock();
- } while ((blockSize > 0) && !err());
- }
-
- }