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gif显示工具
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gif显示工具
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/*
* Copyright (c) 2012 Thunder Software Technology Co.,Ltd.
* All Rights Reserved.
* Thundersoft Confidential and Proprietary.
* Developed by Thundersoft Engineering team.
*/
package com.android.gallery3d.gif;
import java.io.InputStream;
import java.util.Vector;
import android.R.integer;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.util.Log;
public class GifDecoder {
private static final boolean VERBOSE = true;
/**
* The following is the decoder's status
*/
public static final int _STATUS_OK = 0;
/**
* _STATUS_FORMAT_ERROR
*/
public static final int _STATUS_FORMAT_ERROR = 1000;
/**
* _STATUS_OPEN_ERROR
*/
public static final int _STATUS_OPEN_ERROR = 2000;
private static final String TAG = "GifDecoder";
protected int mWidth;
protected int mHeight;
// global color table used
protected boolean mGctFlag;
// size of global color table
protected int mGctSize;
// iterations; 0 = repeat forever
protected int mLoopCount = 1;
protected InputStream mInputStream;
protected int mStatus;
// global color table
protected int[] mGct;
// local color table
protected int[] mLct;
// active color table
protected int[] mAct;
// background color index
protected int mBgIndex;
// background color
protected int mBgColor;
// previous bg color
protected int mLastBgColor;
// pixel aspect ratio
protected int mPixelAspect;
// local color table flag
protected boolean mLctFlag;
// interlace flag
protected boolean mInterlace;
// local color table size
protected int mLctSize;
// current image rectangle
protected int mIx, mIy, mIw, mIh;
protected int mLrx, mLry, mLrw, mLrh;
protected Bitmap mImage; // current frame
protected Bitmap mLastImage; // previous frame
protected int mFrameindex = 0;
protected static final int WAIT_TIME = 10;
protected final int HEAD_FRAME_COUNT = 0;
/**
*
* @return int
*/
public int getFrameindex() {
return mFrameindex;
}
/**
*
* @param frameindex frameindex
*/
public void setFrameindex(int frameindex) {
this.mFrameindex = frameindex;
if (frameindex > mFrames.size() - 1) {
frameindex = 0;
}
}
protected byte[] mBlock = new byte[256]; // current data block
protected int mBlockSize = 0; // block size
// last graphic control extension info
protected int mDispose = 0;
/*
* 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
*/
protected int mLastDispose = 0;
protected boolean mTransparency = false; // use transparent color
protected int mDelay = 0; // delay in milliseconds
protected int mTransIndex; // transparent color index
// max decoder pixel stack size
protected static final int MaxStackSize = 4096;
// LZW decoder working arrays
protected short[] mPrefix;
protected byte[] mSuffix;
protected byte[] mPixelStack;
protected byte[] mPixels;
protected Vector mFrames; // frames read from current file
protected int mFrameCount = 0;
protected boolean mUnDecode = false;
/**
*
* @author owen
*
*/
static class GifFrame {
public GifFrame(Bitmap im, int del) {
image = im;
delay = del;
}
public Bitmap image;
public int delay;
}
/**
*
* @this function must be called before getNext
* @return int
*/
public synchronized int getDelay() {
mDelay = -1;
if (null != mFrames && mFrames.size()>0) {
mDelay = ((GifFrame) mFrames.elementAt(0)).delay;
}
return mDelay;
}
/**
*
* @return int
*/
public int getFrameCount() {
return mFrameCount;
}
public synchronized int getLeftFrameCount() {
if(mFrames == null)return 0;
return mFrames.size();
}
/**
*
* @return Bitmap
*/
public Bitmap getImage() {
Bitmap im = null;
if(null != mFrames && mFrames.size()>0 ) {
im = ((GifFrame) mFrames.elementAt(0)).image;
}
return im;
}
/**
*
* @return int
*/
public int getLoopCount() {
return mLoopCount;
}
protected void setPixels() {
if(VERBOSE)
Log.d(TAG, "setPixels(): mWidth = " + mWidth + ", mHeight = " + mHeight);
int[] dest = new int[mWidth * mHeight];
// Log.d(TAG,
// "fill in starting image contents based on last image's dispose code");
if (mLastDispose > 0) {
if (mLastDispose == 3) {
// use image before last
int n = mFrameCount - 2;
if (n > 0) {
mLastImage = getFrame(n - 1);
} else {
mLastImage = null;
}
}
if (mLastImage != null) {
mLastImage.getPixels(dest, 0, mWidth, 0, 0, mWidth, mHeight);
// copy pixels
if (mLastDispose == 2) {
// Log.d(TAG,
// "fill last image rect area with background color");
int c = 0;
if (!mTransparency) {
c = mLastBgColor;
}
for (int i = 0; i < mLrh; i++) {
int n1 = (mLry + i) * mWidth + mLrx;
int n2 = n1 + mLrw;
for (int k = n1; k < n2; k++) {
dest[k] = c;
}
}
}
}
}
// Log.d(TAG,
// "copy each source line to the appropriate place in the destination");
int pass = 1;
int inc = 8;
int iline = 0;
for (int i = 0; i < mIh; i++) {
int line = i;
if (mInterlace) {
if (iline >= mIh) {
pass++;
switch (pass) {
case 2:
iline = 4;
break;
case 3:
iline = 2;
inc = 4;
break;
case 4:
iline = 1;
inc = 2;
break;
default :
break;
}
}
line = iline;
iline += inc;
}
line += mIy;
if (line < mHeight) {
int k = line * mWidth;
int dx = k + mIx; // start of line in dest
int dlim = dx + mIw; // end of dest line
if ((k + mWidth) < dlim) {
dlim = k + mWidth; // past dest edge
}
int sx = i * mIw; // start of line in source
while (dx < dlim) {
// Log.d(TAG, "map color and insert in destination");
int index = ((int) mPixels[sx++]) & 0xff;
int c = mAct[index];
if (c != 0) {
dest[dx] = c;
}
dx++;
}
}
}
try {
mImage = Bitmap.createBitmap(dest, mWidth, mHeight, Config.RGB_565);
}catch (Exception e) {
// e.printStackTrace();
}
dest = null;
}
public synchronized Bitmap getHeadFrame() {
return getNextFrame();
}
/**
*
* @return Bitmap
*/
public synchronized Bitmap getNextFrame() {
Bitmap im = null;
if(null != mFrames && mFrames.size()>0 ) {
im = ((GifFrame) mFrames.elementAt(0)).image;
// mFrames.remove(0);
}
return im;
}
public synchronized void releaseFrame() {
if(mFrames == null)return;
if(mFrames.size()>0 ) {
GifFrame frame = (GifFrame)mFrames.remove(0);
frame = null;
}
}
private synchronized Bitmap getFrame (int n ) {
Bitmap im = null;
if(null != mFrames && n>0 && n<mFrames.size())
im = ((GifFrame) mFrames.elementAt(n)).image;
return im;
}
/**
*
* @param is is
* @return int
*/
public int readContent(InputStream is,boolean bPrepared, boolean bRepeat) {
if(bPrepared)
init(bRepeat);
if (is != null) {
if(bPrepared){
mInputStream = is;
readHeader();
}
if ((bPrepared && !getErrorStatus()) || !bPrepared) {
readContents(bPrepared);
if (mFrameCount < 0) {
mStatus = _STATUS_FORMAT_ERROR;
}
}
} else {
mStatus = _STATUS_OPEN_ERROR;
}
if(!bPrepared)
try {
is.close();
} catch (Exception e) {
e.printStackTrace();
}
return mStatus;
}
//this function is needed to optimize in order to reduce time
public boolean isSingleFrame (InputStream is) {
mUnDecode = true;
init(false);
mInputStream = is;
if(mInputStream == null)
return false;
readHeader();
readContents(false);
try {
is.close();
} catch (Exception e) {
e.printStackTrace();
}
mUnDecode = false;
return mFrameCount == 1 && getLoopCount() != 0 ? true:false;
}
public boolean isGIF(InputStream is) {
boolean bRet = false;
mInputStream = is;
if(mInputStream == null)
return bRet;
String id = "";
for (int i = 0; i < 6; i++) {
id += (char) readContent();
}
if (id.startsWith("GIF")) {
Log.e(TAG, "not start with GIF");
bRet = true;
}
return bRet;
}
protected void decodeImageData() {
int null_code = -1;
int npix = mIw * mIh;
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 ((mPixels == null) || (mPixels.length < npix)) {
// Log.d(TAG, "allocate new pixel array");
mPixels = null;
mPixels = new byte[npix];
}
if (mPrefix == null) {
mPrefix = new short[MaxStackSize];
}
if (mSuffix == null) {
mSuffix = new byte[MaxStackSize];
}
if (mPixelStack == null) {
mPixelStack = new byte[MaxStackSize + 1];
}
// Log.d(TAG, "Initialize GIF data stream decoder.");
data_size = readContent();
clear = 1 << data_size;
end_of_information = clear + 1;
available = clear + 2;
old_code = null_code;
code_size = data_size + 1;
code_mask = (1 << code_size) - 1;
for (code = 0; code < clear; code++) {
mPrefix[code] = 0;
mSuffix[code] = (byte) code;
}
// Log.d(TAG, "Decode gif pixel stream.");
datum = bits = count = first = top = pi = bi = 0;
for (i = 0; i < npix;) {
if (top == 0) {
if (bits < code_size) {
// Log.d(TAG,
// "Load bytes until there are enough bits for a code.");
if (count == 0) {
// Log.d(TAG, "Read a new data block.");
count = readBlock();
if (count <= 0) {
break;
}
bi = 0;
}
datum += (((int) mBlock[bi]) & 0xff) << bits;
bits += 8;
bi++;
count--;
continue;
}
// Log.d(TAG, "Get the next code.");
code = datum & code_mask;
datum >>= code_size;
bits -= code_size;
// Log.d(TAG, "Interpret the code");
if ((code > available) || (code == end_of_information)) {
break;
}
if (code == clear) {
// Log.d(TAG, "Reset decoder.");
code_size = data_size + 1;
code_mask = (1 << code_size) - 1;
available = clear + 2;
old_code = null_code;
continue;
}
if (old_code == null_code) {
mPixelStack[top++] = mSuffix[code];
old_code = code;
first = code;
continue;
}
in_code = code;
if (code == available) {
mPixelStack[top++] = (byte) first;
code = old_code;
}
while (code > clear) {
mPixelStack[top++] = mSuffix[code];
code = mPrefix[code];
}
first = ((int) mSuffix[code]) & 0xff;
// Log.d(TAG, "Add a new string to the string table");
if (available >= MaxStackSize) {
break;
}
mPixelStack[top++] = (byte) first;
mPrefix[available] = (short) old_code;
mSuffix[available] = (byte) first;
available++;
if (((available & code_mask) == 0) && (available < MaxStackSize)) {
code_size++;
code_mask += available;
}
old_code = in_code;
}
// Log.d(TAG, "Pop a pixel off the pixel stack.");
top--;
mPixels[pi++] = mPixelStack[top];
i++;
}
for (i = pi; i < npix; i++) {
// Log.d(TAG, "clear missing pixels");
mPixels[i] = 0;
}
}
protected boolean getErrorStatus() {
return mStatus != _STATUS_OK;
}
protected void init(boolean bRepeat) {
mStatus = _STATUS_OK;
mFrameCount = 0;
if(!bRepeat)
mFrames = new Vector();
mGct = null;
mLct = null;
}
protected int readContent() {
int currentByte = 0;
try {
currentByte = mInputStream.read();
} catch (Exception e) {
mStatus = _STATUS_FORMAT_ERROR;
}
return currentByte;
}
protected int readBlock() {
mBlockSize = readContent();
int n = 0;
if (mBlockSize > 0) {
try {
int count = 0;
while (n < mBlockSize) {
count = mInputStream.read(mBlock, n, mBlockSize - n);
if (count == -1) {
break;
}
n += count;
}
} catch (Exception e) {
e.printStackTrace();
}
if (n < mBlockSize) {
mStatus = _STATUS_FORMAT_ERROR;
}
}
return n;
}
protected int[] readColorTable(int colors) {
int bytes = 3 * colors;
int[] tab = null;
byte[] bytesArray = new byte[bytes];
int n = 0;
try {
n = mInputStream.read(bytesArray);
} catch (Exception e) {
e.printStackTrace();
}
if (n < bytes) {
mStatus = _STATUS_FORMAT_ERROR;
} else {
// Log.d(TAG, "max size to avoid bounds checks");
tab = new int[256];
int i = 0;
int j = 0;
while (i < colors) {
int r = ((int) bytesArray[j++]) & 0xff;
int g = ((int) bytesArray[j++]) & 0xff;
int b = ((int) bytesArray[j++]) & 0xff;
tab[i++] = 0xff000000 | (r << 16) | (g << 8) | b;
}
}
bytesArray = null;
return tab;
}
// if done is true then stop read the Image
private boolean done;
public void setDone(boolean done) {
this.done = done;
}
protected void readContents(boolean bPrepared) {
// read Gif file content blocks
// done = false;
boolean exit = false;
while (!(done || exit ||getErrorStatus())) {
if(bPrepared && mFrameCount > HEAD_FRAME_COUNT)
break;
if(mUnDecode && mFrameCount>HEAD_FRAME_COUNT+1)
break;
if(mFrames.size() >HEAD_FRAME_COUNT) {
try{
Thread.sleep(WAIT_TIME);
continue;
}catch(Exception e){
}
}
int code = readContent();
switch (code) {
case 0x2C: // image separator
readImage();
break;
case 0x21: // extension
code = readContent();
switch (code) {
case 0xf9: // graphics control extension
readGraphicControlExt();
break;
case 0xff: // application extension
readBlock();
String app = "";
for (int i = 0; i < 11; i++) {
app += (char) mBlock[i];
}
if (app.equals("NETSCAPE2.0")) {
/*
* we can follow
* http://odur.let.rug.nl/~kleiweg/
* gif/netscape.html for reference
*/
readNetscapeExt();
} else {
skip(); // don't care
}
break;
default: // uninteresting extension
skip();
}
break;
case 0x3b:
Log.d(TAG, "terminator, decode succeed");
exit = true;
break;
case 0x00:
// Log.d(TAG,
// "bad byte, but keep going and see what happens");
break;
default:
mStatus = _STATUS_FORMAT_ERROR;
}
}
}
protected void readGraphicControlExt() {
readContent(); // block size
int packed = readContent(); // packed fields
mDispose = (packed & 0x1c) >> 2; // disposal method
if (mDispose == 0) {
// Log.d(TAG, "select to keep old image if discretionary");
mDispose = 1;
}
mTransparency = (packed & 1) != 0;
mDelay = readShort() * 10; // delay in milliseconds
mTransIndex = readContent(); // transparent color index
readContent(); // block terminator
}
protected void readHeader() {
String id = "";
for (int i = 0; i < 6; i++) {
id += (char) readContent();
}
if (!id.startsWith("GIF")) {
Log.e(TAG, "not start with GIF");
mStatus = _STATUS_FORMAT_ERROR;
return;
}
readLSD();
if (mGctFlag && !getErrorStatus()) {
mGct = null;
mGct = readColorTable(mGctSize);
mBgColor = mGct[mBgIndex];
}
}
protected synchronized void readImage() {
mIx = readShort(); // (sub)image position & size
mIy = readShort();
mIw = readShort();
mIh = readShort();
int packed = readContent();
mLctFlag = (packed & 0x80) != 0; // 1 - local color table flag
mInterlace = (packed & 0x40) != 0;
// 2 - interlace flag
// 3 - sort flag
// 4-5 - reserved
// 6-8 - local color table size
mLctSize = 2 << (packed & 7);
if (mLctFlag) {
mLct = null;
mLct = readColorTable(mLctSize); // read table
// Log.d(TAG, "make local table active");
mAct = mLct;
} else {
// Log.d(TAG, "make global table active");
mAct = mGct;
if (mBgIndex == mTransIndex) {
mBgColor = 0;
}
}
int save = 0;
if (mTransparency) {
// Log.d(TAG, "set transparent color if specified");
save = mAct[mTransIndex];
mAct[mTransIndex] = 0;
}
if (mAct == null) {
Log.e(TAG, "no color table defined");
mStatus = _STATUS_FORMAT_ERROR;
}
if (getErrorStatus()) {
return ;
}
// Log.d(TAG, "decode pixel data");
decodeImageData();
skip();
if (getErrorStatus()) {
return ;
}
mFrameCount++;
// try {
// // Log.d(TAG, "create new image to receive frame data");
// mImage = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888);
// } catch (Exception e) {
// e.printStackTrace();
// }
// createImage(width, height);
Log.d(TAG, "add image begin mFrameCount "+mFrameCount +"leftFrame:"+getLeftFrameCount());
if(!mUnDecode) {
setPixels();
// Log.d(TAG, "add image to frame");
mFrames.addElement(new GifFrame(mImage, mDelay));
Log.d(TAG, "add image end mFrameCount "+"leftFrame:"+getLeftFrameCount());
}
// list
if (mTransparency) {
mAct[mTransIndex] = save;
}
resetFrame();
}
protected void readLSD() {
// logical screen size
mWidth = readShort();
mHeight = readShort();
// packed fields
int packedField = readContent();
mGctFlag = (packedField & 0x80) != 0;
// 1 : global color table flag
// 2-4 : color resolution
// 5 : gct sort flag
// 6-8 : gct size
mGctSize = 2 << (packedField & 7);
mBgIndex = readContent(); // background color index
mPixelAspect = readContent(); // pixel aspect ratio
}
protected void readNetscapeExt() {
do {
readBlock();
if (mBlock[0] == 1) {
// loop count sub-block
int b1 = ((int) mBlock[1]) & 0xff;
int b2 = ((int) mBlock[2]) & 0xff;
mLoopCount = (b2 << 8) | b1;
}
} while ((mBlockSize > 0) && !getErrorStatus());
}
protected int readShort() {
// Log.d(TAG, "read 16-bit value, LSB first");
return readContent() | (readContent() << 8);
}
protected void resetFrame() {
mLastDispose = mDispose;
mLrw = mIw;
mLrh = mIh;
mLrx = mIx;
mLry = mIy;
mDispose = 0;
mLastImage = mImage;
mLastBgColor = mBgColor;
mTransparency = false;
mDelay = 0;
mLct = null;
}
/**
* Skips variable length blocks up to and including next zero length block.
*/
protected void skip() {
do {
readBlock();
} while ((mBlockSize > 0) && !getErrorStatus());
}
public void release() {
setDone(false);
mBlock = null;
mPrefix = null;
mSuffix = null;
mPixelStack = null;
mPixels = null;
mGct = null;
mLct = null;
mAct = null;
}
}
/*
* Copyright (c) 2012 Thunder Software Technology Co.,Ltd.
* All Rights Reserved.
* Thundersoft Confidential and Proprietary.
* Developed by Thundersoft Engineering team.
*/
package com.android.gallery3d.gif;
import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Toast;
import com.gangyun.camera.R;
public class GifPlayerActivity extends Activity {
private static final String TAG = "GifPlayerActivity";
private GifView mGifView = null;
private boolean isFirstShow = true;
/**
* MSG_DECODE_GIF_ERROR
*/
public static final int MSG_DECODE_GIF_ERROR = 0x2000;
//when decoder begin than send this message
public static final int MSG_DECODE_BEGIN = 0x2001;
public static final int MSG_DECODE_FINISH= 0x2002;
public static final int MSG_DECODE_NOTGIF = 0x2003;
/**
* mHandler
*/
public Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_DECODE_NOTGIF:
if(isFirstShow) {
isFirstShow = false;
}
if(mGifView != null) {
mGifView.recycleGifFrame();
}
finish();
break;
case MSG_DECODE_GIF_ERROR:
Log.d(TAG, "handleMessage(): isFirstShow = " + isFirstShow);
if(isFirstShow) {
// Toast.makeText(QPhoneGifPlayerActivity.this,
// getString(Res.string.qphone_cannot_play_current_gif), Toast.LENGTH_SHORT).show();
isFirstShow = false;
}
if(mGifView != null) {
mGifView.recycleGifFrame();
}
Toast.makeText(GifPlayerActivity.this,getString(R.string.cannot_play_current_gif), Toast.LENGTH_SHORT).show();
finish();
break;
case MSG_DECODE_BEGIN:
// start thread for update the view
if (mGifView != null) {
Thread t = new Thread(mGifView);
t.start();
}
break;
case MSG_DECODE_FINISH:
finish();
break;
default :
break;
}
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Uri gifUri = getIntent().getData();
Log.d(TAG, "gifUri: " + gifUri);
try {
mGifView = new GifView(this, gifUri, mHandler);
} catch(OutOfMemoryError e) {
e.printStackTrace();
}
Log.d(TAG, "onCreate(): entry to play gif animation...mQPhoneGifView = " + mGifView);
if(mGifView !=null) {
setContentView(mGifView);
} else {
mHandler.obtainMessage();
mHandler.sendEmptyMessage(MSG_DECODE_GIF_ERROR);
}
// setContentView(R.layout.gif_layout);
}
public void onPause() {
super.onPause();
// if(App.VERBOSE) {
// Log.d(TAG, "onPause(): mQphoneGifView = " + mQPhoneGifView);
// }
//when playing one gif, screen off, and then screen on,
//the playing interface is black, now if happen, exit current playing interface.
if(mGifView != null) {
mGifView.recycleGifFrame();
}
finish();
}
/*@Override
public void onDestroy() {
super.onDestroy();
if(mQPhoneGifView != null) {
mQPhoneGifView.recycleGifFrame();
}
}*/
}
/*
* Copyright (c) 2012 Thunder Software Technology Co.,Ltd.
* All Rights Reserved.
* Thundersoft Confidential and Proprietary.
* Developed by Thundersoft Engineering team.
*/
package com.android.gallery3d.gif;