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suwhs/AssetGifDrawable.java

Created September 3, 2015 21:58
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LazyDrawable - abstract class with support preview and full drawable loading on demand, AssetGifDrawable - example implementation that show animated gif, and required classes
Raw
AssetGifDrawable.java
/*
* Copyright 2015 whs.su
* 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.
*/
package su.whs.watl.samples;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import java.io.IOException;
import java.io.InputStream;
import pl.droidsonroids.gif.GifDrawable;
import su.whs.watl.experimental.LazyDrawable;
import su.whs.watl.samples.utils.GifDecoder;
/**
* Created by igor n. boulliev on 31.08.15.
*/
/**
* demo code for suppport animated drawables in TextViewEx (wATL/wATLlib)
* gradle dependency :
* compile 'pl.droidsonroids.gif:android-gif-drawable:1.1.+'
* (and GifDrawableCompat.java for old AOSP version. It's ok to use ONLY GifDrawableCompat - so you can remove
* android-gif-drawable dependency and fix code)
*
* LazyDrawable required for animation on demand launch,
* and for support AOSP < 11
*
*
*/
public class AssetGifDrawable extends LazyDrawable {
private String mPath;
private Context mContext;
private boolean mFullVersionLoaded = false;
public AssetGifDrawable(Context context, String path) {
super(0, 0);
mPath = path;
mContext = context;
Drawable drawable = readPreviewDrawable();
if (drawable==null) {
onFailure();
return;
}
setSize(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
setDrawable(drawable);
}
/**
* readPreviewDrawable() must returns initial image for DynamicDrawableSpan (less resolution version, BW version),
* or single frame from animation
*
* @return
*/
@Override
protected Drawable readPreviewDrawable() {
if (mLoadingError) return null;
GifDecoder decoder = new GifDecoder();
try {
InputStream inputStream = mContext.getAssets().open(mPath);
decoder.read(inputStream, 0);
decoder.advance();
Bitmap frame = decoder.getNextFrame();
Drawable result = new BitmapDrawable(mContext.getResources(),frame);
inputStream.close();
return result;
} catch (IOException e) {
onFailure();
return null;
}
}
/**
* readFullDrawable must returns high-quality version of image, or Animatable instance
*
* @return
*/
@Override
protected Drawable readFullDrawable() {
if (mLoadingError) return null;
if (mFullVersionLoaded) return null;
try {
/* GifDrawable implements Animatable, so we can show animations */
Drawable r = Build.VERSION.SDK_INT>18 ? new GifDrawable(mContext.getAssets().open(mPath)) : new GifDrawableCompat(mContext.getAssets().open(mPath));
mFullVersionLoaded = true;
return r;
} catch (IOException e) {
onFailure();
return null;
}
}
/* call loadFullImage and launch animation */
@Override
public void start() {
loadFullImage();
super.start();
}
public String getPath() {
return mPath;
}
}
Raw
GifDecoder.java
package su.whs.watl.samples.utils;
/**
* Copyright (c) 2013 Xcellent Creations, Inc.
* <p/>
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
* <p/>
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
* <p/>
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
import android.graphics.Bitmap;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
/**
* Reads frame data from a GIF image source and decodes it into individual frames
* for animation purposes. Image data can be read from either and InputStream source
* or a byte[].
*
* This class is optimized for running animations with the frames, there
* are no methods to get individual frame images, only to decode the next frame in the
* animation sequence. Instead, it lowers its memory footprint by only housing the minimum
* data necessary to decode the next frame in the animation sequence.
*
* The animation must be manually moved forward using {@link #advance()} before requesting the next
* frame. This method must also be called before you request the first frame or an error will
* occur.
*
* Implementation adapted from sample code published in Lyons. (2004). <em>Java for Programmers</em>,
* republished under the MIT Open Source License
*/
public class GifDecoder {
private static final String TAG = GifDecoder.class.getSimpleName();
/**
* File read status: No errors.
*/
public static final int STATUS_OK = 0;
/**
* File read status: Error decoding file (may be partially decoded)
*/
public static final int STATUS_FORMAT_ERROR = 1;
/**
* File read status: Unable to open source.
*/
public static final int STATUS_OPEN_ERROR = 2;
/**
* max decoder pixel stack size
*/
protected static final int MAX_STACK_SIZE = 4096;
/**
* GIF Disposal Method meaning take no action
*/
private static final int DISPOSAL_UNSPECIFIED = 0;
/**
* GIF Disposal Method meaning leave canvas from previous frame
*/
private static final int DISPOSAL_NONE = 1;
/**
* GIF Disposal Method meaning clear canvas to background color
*/
private static final int DISPOSAL_BACKGROUND = 2;
/**
* GIF Disposal Method meaning clear canvas to frame before last
*/
private static final int DISPOSAL_PREVIOUS = 3;
/**
* Global status code of GIF data parsing
*/
protected int status;
//Global File Header values and parsing flags
protected int width; // full image width
protected int height; // full image height
protected boolean gctFlag; // global color table used
protected int gctSize; // size of global color table
protected int loopCount = 1; // iterations; 0 = repeat forever
protected int[] gct; // global color table
protected int[] act; // active color table
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 int lctSize; // local color table size
// Raw GIF data from input source
protected ByteBuffer rawData;
// Raw data read working array
protected byte[] block = new byte[256]; // current data block
protected int blockSize = 0; // block size last graphic control extension info
// LZW decoder working arrays
protected short[] prefix;
protected byte[] suffix;
protected byte[] pixelStack;
protected byte[] mainPixels;
protected int[] mainScratch, copyScratch;
protected ArrayList<GifFrame> frames; // frames read from current file
protected GifFrame currentFrame;
protected Bitmap previousImage, currentImage, renderImage;
protected int framePointer;
protected int frameCount;
/**
* Inner model class housing metadata for each frame
*/
private static class GifFrame {
public int ix, iy, iw, ih;
/* Control Flags */
public boolean interlace;
public boolean transparency;
/* Disposal Method */
public int dispose;
/* Transparency Index */
public int transIndex;
/* Delay, in ms, to next frame */
public int delay;
/* Index in the raw buffer where we need to start reading to decode */
public int bufferFrameStart;
/* Local Color Table */
public int[] lct;
}
/**
* Move the animation frame counter forward
*/
public void advance() {
framePointer = (framePointer + 1) % frameCount;
}
/**
* Gets display duration for specified frame.
*
* @param n int index of frame
* @return delay in milliseconds
*/
public int getDelay(int n) {
int delay = -1;
if ((n >= 0) && (n < frameCount)) {
delay = frames.get(n).delay;
}
return delay;
}
/**
* Gets display duration for the upcoming frame
*/
public int getNextDelay() {
if (frameCount <= 0 || framePointer < 0) {
return -1;
}
return getDelay(framePointer);
}
/**
* Gets the number of frames read from file.
*
* @return frame count
*/
public int getFrameCount() {
return frameCount;
}
/**
* Gets the current index of the animation frame, or -1 if animation hasn't not yet started
*
* @return frame index
*/
public int getCurrentFrameIndex() {
return framePointer;
}
/**
* Gets the "Netscape" iteration count, if any. A count of 0 means repeat indefinitiely.
*
* @return iteration count if one was specified, else 1.
*/
public int getLoopCount() {
return loopCount;
}
/**
* Get the next frame in the animation sequence.
*
* @return Bitmap representation of frame
*/
public Bitmap getNextFrame() {
if (frameCount <= 0 || framePointer < 0 || currentImage == null) {
return null;
}
GifFrame frame = frames.get(framePointer);
//Set the appropriate color table
if (frame.lct == null) {
act = gct;
} else {
act = frame.lct;
if (bgIndex == frame.transIndex) {
bgColor = 0;
}
}
int save = 0;
if (frame.transparency) {
save = act[frame.transIndex];
act[frame.transIndex] = 0; // set transparent color if specified
}
if (act == null) {
Log.w(TAG, "No Valid Color Table");
status = STATUS_FORMAT_ERROR; // no color table defined
return null;
}
setPixels(framePointer); // transfer pixel data to image
// Reset the transparent pixel in the color table
if (frame.transparency) {
act[frame.transIndex] = save;
}
return currentImage;
}
/**
* Reads GIF image from stream
*
* @param is containing GIF file.
* @return read status code (0 = no errors)
*/
public int read(InputStream is, int contentLength) {
long startTime = System.currentTimeMillis();
if (is != null) {
try {
int capacity = (contentLength > 0) ? (contentLength + 4096) : 4096;
ByteArrayOutputStream buffer = new ByteArrayOutputStream(capacity);
int nRead;
byte[] data = new byte[16384];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
read(buffer.toByteArray());
// TODO: implement read on demand with recycle bitmaps
} catch (IOException e) {
Log.w(TAG, "Error reading data from stream", e);
}
} else {
status = STATUS_OPEN_ERROR;
}
try {
is.close();
} catch (Exception e) {
Log.w(TAG, "Error closing stream", e);
}
return status;
}
/**
* Reads GIF image from byte array
*
* @param data containing GIF file.
* @return read status code (0 = no errors)
*/
public int read(byte[] data) {
init();
if (data != null) {
//Initiliaze the raw data buffer
rawData = ByteBuffer.wrap(data);
rawData.rewind();
rawData.order(ByteOrder.LITTLE_ENDIAN);
readHeader();
if (!err()) {
readContents();
if (frameCount < 0) {
status = STATUS_FORMAT_ERROR;
}
}
} else {
status = STATUS_OPEN_ERROR;
}
return status;
}
/**
* Creates new frame image from current data (and previous frames as specified by their disposition codes).
*/
protected void setPixels(int frameIndex) {
GifFrame currentFrame = frames.get(frameIndex);
GifFrame previousFrame = null;
int previousIndex = frameIndex - 1;
if (previousIndex >= 0) {
previousFrame = frames.get(previousIndex);
}
// final location of blended pixels
final int[] dest = mainScratch;
// fill in starting image contents based on last image's dispose code
if (previousFrame != null && previousFrame.dispose > DISPOSAL_UNSPECIFIED) {
if (previousFrame.dispose == DISPOSAL_NONE && currentImage != null) {
// Start with the current image
currentImage.getPixels(dest, 0, width, 0, 0, width, height);
}
if (previousFrame.dispose == DISPOSAL_BACKGROUND) {
// Start with a canvas filled with the background color
int c = 0;
if (!currentFrame.transparency) {
c = bgColor;
}
for (int i = 0; i < previousFrame.ih; i++) {
int n1 = (previousFrame.iy + i) * width + previousFrame.ix;
int n2 = n1 + previousFrame.iw;
for (int k = n1; k < n2; k++) {
dest[k] = c;
}
}
}
if (previousFrame.dispose == DISPOSAL_PREVIOUS && previousImage != null) {
// Start with the previous frame
previousImage.getPixels(dest, 0, width, 0, 0, width, height);
}
}
//Decode pixels for this frame into the global pixels[] scratch
decodeBitmapData(currentFrame, mainPixels); // decode pixel data
// 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 < currentFrame.ih; i++) {
int line = i;
if (currentFrame.interlace) {
if (iline >= currentFrame.ih) {
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 += currentFrame.iy;
if (line < height) {
int k = line * width;
int dx = k + currentFrame.ix; // start of line in dest
int dlim = dx + currentFrame.iw; // end of dest line
if ((k + width) < dlim) {
dlim = k + width; // past dest edge
}
int sx = i * currentFrame.iw; // start of line in source
while (dx < dlim) {
// map color and insert in destination
int index = ((int) mainPixels[sx++]) & 0xff;
int c = act[index];
if (c != 0) {
dest[dx] = c;
}
dx++;
}
}
}
//Copy pixels into previous image
currentImage.getPixels(copyScratch, 0, width, 0, 0, width, height);
previousImage.setPixels(copyScratch, 0, width, 0, 0, width, height);
//Set pixels for current image
currentImage.setPixels(dest, 0, width, 0, 0, width, height);
}
/**
* Decodes LZW image data into pixel array. Adapted from John Cristy's BitmapMagick.
*/
protected void decodeBitmapData(GifFrame frame, byte[] dstPixels) {
long startTime = System.currentTimeMillis();
long stepOne, stepTwo, stepThree;
if (frame != null) {
//Jump to the frame start position
rawData.position(frame.bufferFrameStart);
}
int nullCode = -1;
int npix = (frame == null) ? width * height : frame.iw * frame.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 (dstPixels == null || dstPixels.length < npix) {
dstPixels = new byte[npix]; // allocate new pixel array
}
if (prefix == null) {
prefix = new short[MAX_STACK_SIZE];
}
if (suffix == null) {
suffix = new byte[MAX_STACK_SIZE];
}
if (pixelStack == null) {
pixelStack = new byte[MAX_STACK_SIZE + 1];
}
// Initialize GIF data stream decoder.
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; // XXX ArrayIndexOutOfBoundsException
suffix[code] = (byte) code;
}
// Decode GIF pixel stream.
datum = bits = count = first = top = pi = 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) {
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 >= MAX_STACK_SIZE) {
break;
}
pixelStack[top++] = (byte) first;
prefix[available] = (short) old_code;
suffix[available] = (byte) first;
available++;
if (((available & code_mask) == 0) && (available < MAX_STACK_SIZE)) {
code_size++;
code_mask += available;
}
old_code = in_code;
}
// Pop a pixel off the pixel stack.
top--;
dstPixels[pi++] = pixelStack[top];
i++;
}
for (i = pi; i < npix; i++) {
dstPixels[i] = 0; // clear missing pixels
}
}
/**
* Returns true if an error was encountered during reading/decoding
*/
protected boolean err() {
return status != STATUS_OK;
}
/**
* Initializes or re-initializes reader
*/
protected void init() {
status = STATUS_OK;
frameCount = 0;
framePointer = -1;
frames = new ArrayList<GifFrame>();
gct = null;
}
/**
* Reads a single byte from the input stream.
*/
protected int read() {
int curByte = 0;
try {
curByte = (rawData.get() & 0xFF);
} catch (Exception e) {
status = STATUS_FORMAT_ERROR;
}
return curByte;
}
/**
* Reads next variable length block from input.
*
* @return number of bytes stored in "buffer"
*/
protected int readBlock() {
blockSize = read();
int n = 0;
if (blockSize > 0) {
try {
int count;
while (n < blockSize) {
count = blockSize - n;
rawData.get(block, n, count);
n += count;
}
} catch (Exception e) {
Log.w(TAG, "Error Reading Block", e);
status = STATUS_FORMAT_ERROR;
}
}
return n;
}
/**
* Reads color table as 256 RGB integer values
*
* @param ncolors int number of colors to read
* @return int array containing 256 colors (packed ARGB with full alpha)
*/
protected int[] readColorTable(int ncolors) {
int nbytes = 3 * ncolors;
int[] tab = null;
byte[] c = new byte[nbytes];
try {
rawData.get(c);
tab = new int[256]; // max size to avoid bounds checks
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;
}
} catch (BufferUnderflowException e) {
Log.w(TAG, "Format Error Reading Color Table", e);
status = STATUS_FORMAT_ERROR;
}
return tab;
}
/**
* Main file parser. Reads GIF content blocks.
*/
protected void readContents() {
// read GIF file content blocks
boolean done = false;
while (!(done || err())) {
int code = read();
switch (code) {
case 0x2C: // image separator
readBitmap();
break;
case 0x21: // extension
code = read();
switch (code) {
case 0xf9: // graphics control extension
//Start a new frame
currentFrame = new GifFrame();
readGraphicControlExt();
break;
case 0xff: // application extension
readBlock();
String app = "";
for (int i = 0; i < 11; i++) {
app += (char) block[i];
}
if (app.equals("NETSCAPE2.0")) {
readNetscapeExt();
} else {
skip(); // don't care
}
break;
case 0xfe:// comment extension
skip();
break;
case 0x01:// plain text extension
skip();
break;
default: // uninteresting extension
skip();
}
break;
case 0x3b: // terminator
done = true;
break;
case 0x00: // bad byte, but keep going and see what happens break;
default:
status = STATUS_FORMAT_ERROR;
}
}
}
/**
* Reads GIF file header information.
*/
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];
}
}
/**
* Reads Graphics Control Extension values
*/
protected void readGraphicControlExt() {
read(); // block size
int packed = read(); // packed fields
currentFrame.dispose = (packed & 0x1c) >> 2; // disposal method
if (currentFrame.dispose == 0) {
currentFrame.dispose = 1; // elect to keep old image if discretionary
}
currentFrame.transparency = (packed & 1) != 0;
currentFrame.delay = readShort() * 10; // delay in milliseconds
currentFrame.transIndex = read(); // transparent color index
read(); // block terminator
}
/**
* Reads next frame image
*/
protected void readBitmap() {
currentFrame.ix = readShort(); // (sub)image position & size
currentFrame.iy = readShort();
currentFrame.iw = readShort();
currentFrame.ih = readShort();
int packed = read();
lctFlag = (packed & 0x80) != 0; // 1 - local color table flag interlace
lctSize = (int) Math.pow(2, (packed & 0x07) + 1);
// 3 - sort flag
// 4-5 - reserved lctSize = 2 << (packed & 7); // 6-8 - local color
// table size
currentFrame.interlace = (packed & 0x40) != 0;
if (lctFlag) {
currentFrame.lct = readColorTable(lctSize); // read table
} else {
currentFrame.lct = null; //No local color table
}
currentFrame.bufferFrameStart = rawData.position(); //Save this as the decoding position pointer
decodeBitmapData(null, mainPixels); // false decode pixel data to advance buffer
skip();
if (err()) {
return;
}
frameCount++;
frames.add(currentFrame); // add image to frame
}
/**
* Reads Logical Screen Descriptor
*/
protected void readLSD() {
// logical screen size
width = readShort();
height = readShort();
// packed fields
int packed = read();
gctFlag = (packed & 0x80) != 0; // 1 : global color table flag
// 2-4 : color resolution
// 5 : gct sort flag
gctSize = 2 << (packed & 7); // 6-8 : gct size
bgIndex = read(); // background color index
pixelAspect = read(); // pixel aspect ratio
//Now that we know the size, init scratch arrays
mainPixels = new byte[width * height];
mainScratch = new int[width * height];
copyScratch = new int[width * height];
previousImage = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
currentImage = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
}
/**
* Reads Netscape extenstion to obtain iteration count
*/
protected void readNetscapeExt() {
do {
readBlock();
if (block[0] == 1) {
// loop count sub-block
int b1 = ((int) block[1]) & 0xff;
int b2 = ((int) block[2]) & 0xff;
loopCount = (b2 << 8) | b1;
}
} while ((blockSize > 0) && !err());
}
/**
* Reads next 16-bit value, LSB first
*/
protected int readShort() {
// read 16-bit value
return rawData.getShort();
}
/**
* Skips variable length blocks up to and including next zero length block.
*/
protected void skip() {
do {
readBlock();
} while ((blockSize > 0) && !err());
}
}
Raw
GifDrawableCompat.java
/*
* Copyright 2015 whs.su
* 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.
*/
package su.whs.watl.samples;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Animatable;
import android.graphics.drawable.Drawable;
import android.os.SystemClock;
import java.io.InputStream;
import su.whs.watl.samples.utils.GifDecoder;
/**
* Created by igor n. boulliev on 01.09.15.
*/
public class GifDrawableCompat extends Drawable implements Animatable {
private GifDecoder mDecoder;
private Bitmap mFrame;
private boolean mStarted = false;
private Paint mPaint = new Paint();
private Rect mSrcRect = new Rect();
private Runnable updateRunable = new Runnable() {
@Override
public void run() {
nextFrame();
if (mStarted)
scheduleSelf(updateRunable, SystemClock.uptimeMillis()+mDecoder.getNextDelay());
}
};
public GifDrawableCompat(InputStream inputStream) {
mDecoder = new GifDecoder();
mDecoder.read(inputStream,0);
mDecoder.advance();
mFrame = mDecoder.getNextFrame();
mSrcRect.set(0,0,mFrame.getWidth(),mFrame.getHeight());
}
@Override
public int getIntrinsicWidth() { return mSrcRect.width(); }
@Override
public int getIntrinsicHeight() { return mSrcRect.height(); }
private void nextFrame() {
mDecoder.advance();
mFrame = mDecoder.getNextFrame();
invalidateSelf();
}
@Override
public void start() {
mStarted = true;
scheduleSelf(updateRunable,SystemClock.uptimeMillis()+mDecoder.getNextDelay());
}
@Override
public void stop() {
unscheduleSelf(updateRunable);
mStarted = false;
}
@Override
public boolean isRunning() {
return mStarted;
}
@Override
public void draw(Canvas canvas) {
canvas.drawBitmap(mFrame,mSrcRect,getBounds(),mPaint);
}
@Override
public void setAlpha(int alpha) {
mPaint.setAlpha(alpha);
}
@Override
public void setColorFilter(ColorFilter cf) {
mPaint.setColorFilter(cf);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSPARENT;
}
}
Raw
LazyDrawable.java
/*
* Copyright 2015 whs.su
* 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.
*/
package su.whs.watl.experimental;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Rect;
import android.graphics.drawable.Animatable;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Handler;
import android.os.Looper;
import android.os.SystemClock;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Created by igor n. boulliev on 29.08.15.
*/
/**
* abstract class for support two display mode - 'preview' and 'full'
* for example, it may display local cached jpeg as preview, and load high quality png on
* request
*
*/
public abstract class LazyDrawable extends Drawable implements Animatable, Drawable.Callback {
private static ThreadPoolExecutor executor = new ThreadPoolExecutor(1,3,10, TimeUnit.SECONDS,new LinkedBlockingQueue<Runnable>());
private static final String TAG="LazyDrawable";
private int mSrcWidth;
private int mSrcHeight;
private Drawable mDrawable;
private Rect mBounds = new Rect();
private boolean mBoundsApplied = false;
private boolean mLoadingInProgress = false;
protected boolean mLoadingError = false;
private Drawable.Callback mCallbackCompat = null;
/**
* create instance with given size
* @param srcWidth
* @param srcHeight
*/
public LazyDrawable(int srcWidth, int srcHeight) {
mSrcWidth = srcWidth;
mSrcHeight = srcHeight;
mBounds.set(0, 0, srcWidth, srcHeight);
}
@Override
public int getIntrinsicWidth() {
return mSrcWidth;
}
@Override
public int getIntrinsicHeight() {
return mSrcHeight;
}
@Override
public void setBounds(int left, int top, int right, int bottom) {
mBoundsApplied = false;
mBounds.set(left,top,right,bottom);
super.setBounds(left,top,right,bottom);
}
/**
* set size and adjust bounds
* @param srcWidth
* @param srcHeight
*/
protected void setSize(int srcWidth, int srcHeight) {
mSrcWidth = srcWidth;
mSrcHeight = srcHeight;
mBounds.right = mBounds.left + srcWidth;
mBounds.bottom = mBounds.top + srcHeight;
mBoundsApplied = false;
}
/**
* load preview (sync)
*/
public void initialLoad() {
Drawable d = readPreviewDrawable();
synchronized (LazyDrawable.this) {
mDrawable = d;
mLoadingInProgress = false;
}
}
/**
* if no preview loaded - execute initialLoad() in background and draw 'loadingFrame', if defined
* @param canvas
*/
@Override
public void draw(Canvas canvas) {
if (mDrawable==null) {
synchronized (this) {
mLoadingInProgress = true;
executor.execute(new Runnable() {
@Override
public void run() {
initialLoad();
invalidateSelfOnUiThread();
}
});
}
}
if (!mBoundsApplied) {
synchronized (this) {
mDrawable.setBounds(mBounds);
mBoundsApplied = true;
}
}
boolean loadError;
boolean loadingInProgress;
synchronized (this) {
if (mDrawable!=null)
mDrawable.draw(canvas);
loadError = mLoadingError;
loadingInProgress = mLoadingInProgress;
}
if (loadingInProgress) {
/* draw loading animation */
drawNextLoadingFrame(canvas);
/* */
if (getCallbackCompat()!=null) {
scheduleSelf(new Runnable() {
@Override
public void run() {
invalidateSelf();
}
}, SystemClock.uptimeMillis()+100);
}
} else if (loadError) {
/* draw loading error sign */
}
}
/**
* by default - do nothing. Override it to draw loading animation
* @param canvas
*/
protected void drawNextLoadingFrame(Canvas canvas) {
}
/**
* initiate load full image (sync)
*/
public void loadFullImage() {
synchronized (this) {
mLoadingError = false;
mLoadingInProgress = true;
}
executor.execute(
new Runnable() {
@Override
public void run() {
Drawable drawable = readFullDrawable();
synchronized (LazyDrawable.this) {
if (drawable != null)
setDrawable(drawable);
}
invalidateSelfOnUiThread();
}
}
);
}
@Override
public void setAlpha(int alpha) {
synchronized (this) {
mDrawable.setAlpha(alpha);
}
}
@Override
public void setColorFilter(ColorFilter cf) {
synchronized (this) {
mDrawable.setColorFilter(cf);
}
}
@Override
public int getOpacity() {
synchronized (this) {
return mDrawable.getOpacity();
}
}
@Override
public void start() {
synchronized (this) {
if (mDrawable instanceof Animatable) {
((Animatable)mDrawable).start();
}
}
}
@Override
public void stop() {
synchronized (this) {
if (mDrawable instanceof Animatable) {
((Animatable)mDrawable).stop();
}
}
}
@Override
public boolean isRunning() {
synchronized (this) {
if (mDrawable instanceof Animatable) {
return ((Animatable)mDrawable).isRunning();
}
}
return false;
}
/**
* replace wrapped drawable (and reset internal flags)
* @param drawable
*/
protected synchronized void setDrawable(Drawable drawable) {
if (mDrawable!=null && isRunning()) stop();
mDrawable = drawable;
mDrawable.setCallback(this);
mBoundsApplied = false;
}
/**
* set unrecoverable load error flag
*/
protected void onFailure() {
mLoadingError = true;
invalidateSelfOnUiThread();
}
@Override
public void invalidateDrawable(Drawable who) {
if (getCallbackCompat()!=null)
getCallbackCompat().invalidateDrawable(this);
}
@Override
public void scheduleDrawable(Drawable who, Runnable what, long when) {
if (getCallbackCompat()!=null)
getCallbackCompat().scheduleDrawable(this, what, when);
}
@Override
public void unscheduleDrawable(Drawable who, Runnable what) {
if (getCallbackCompat()!=null)
getCallbackCompat().unscheduleDrawable(this, what);
}
private Drawable.Callback getCallbackCompat() {
if (Build.VERSION.SDK_INT>10) return getCallback();
return mCallbackCompat;
}
public void setCallbackCompat(Drawable.Callback cb) {
if (Build.VERSION.SDK_INT>10) {
setCallback(cb);
return;
}
mCallbackCompat = cb;
}
/**
* run invalidateSelf() on MainLooper
*/
protected void invalidateSelfOnUiThread() {
if (Looper.getMainLooper().getThread().equals(Thread.currentThread())) {
invalidateSelf();
} else {
new Handler(Looper.getMainLooper()).post(new Runnable() {
@Override
public void run() {
LazyDrawable.this.invalidateSelf();
}
});
}
}
/**
* abstract method. Implementation must return Drawable fast as possible
* @return
*/
protected abstract Drawable readPreviewDrawable();
/**
* abstract method. Implementation may load real image from network (not fast),
* store to cache (and use it when this drawable required again)
* @return
*/
protected abstract Drawable readFullDrawable();
/**
* sample implementation - only 'slow method'
* generally - for development and debug purposes
*/
public static class FromURL extends LazyDrawable {
private String mSrcUrl;
public FromURL(String srcUrl) throws IOException {
super(0, 0);
mSrcUrl = srcUrl;
Drawable drawable = readFullDrawable();
setDrawable(drawable);
}
protected FromURL(int srcWidth, int srcHeight) {
super(srcWidth, srcHeight);
}
protected FromURL(int srcWidth, int srcHeight, String srcUrl) {
super(srcWidth,srcHeight);
mSrcUrl = srcUrl;
}
public String getURL() { return mSrcUrl; }
@Override
protected Drawable readPreviewDrawable() {
return readFullDrawable();
}
@Override
protected Drawable readFullDrawable() {
URL url;
try {
url = new URL(mSrcUrl);
} catch (MalformedURLException e) {
onFailure();
return null;
}
Bitmap image = null;
try {
image = BitmapFactory.decodeStream(url.openConnection().getInputStream());
} catch (IOException e) {
onFailure();
return null;
}
setSize(image.getWidth(),image.getHeight());
return new BitmapDrawable(Resources.getSystem(),image);
}
}
}
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