package me.xiaopan.sketch.cache;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Build;
import android.text.format.Formatter;
import android.util.Log;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import me.xiaopan.sketch.SLogType;
import me.xiaopan.sketch.SLog;
import me.xiaopan.sketch.cache.recycle.AttributeStrategy;
import me.xiaopan.sketch.cache.recycle.LruPoolStrategy;
import me.xiaopan.sketch.cache.recycle.SizeConfigStrategy;
import me.xiaopan.sketch.util.SketchUtils;
/**
* An {@link BitmapPool} implementation that uses an
* {@link me.xiaopan.sketch.cache.recycle.LruPoolStrategy} to bucket {@link Bitmap}s and then uses an LRU
* eviction policy to evict {@link android.graphics.Bitmap}s from the least recently used bucket in order to keep
* the pool below a given maximum size limit.
*/
public class LruBitmapPool implements BitmapPool {
private static final Bitmap.Config DEFAULT_CONFIG = Bitmap.Config.ARGB_8888;
private final LruPoolStrategy strategy;
private final Set<Bitmap.Config> allowedConfigs;
private final int initialMaxSize;
private final BitmapTracker tracker;
protected String logName = "LruBitmapPool";
private int maxSize;
private int currentSize;
private int hits;
private int misses;
private int puts;
private int evictions;
private Context context;
private boolean closed;
private boolean disabled;
// Exposed for testing only.
LruBitmapPool(Context context, int maxSize, LruPoolStrategy strategy, Set<Bitmap.Config> allowedConfigs) {
context = context.getApplicationContext();
this.context = context;
this.initialMaxSize = maxSize;
this.maxSize = maxSize;
this.strategy = strategy;
this.allowedConfigs = allowedConfigs;
this.tracker = new NullBitmapTracker();
}
/**
* Constructor for LruBitmapPool.
*
* @param maxSize The initial maximum size of the pool in bytes.
*/
public LruBitmapPool(Context context, int maxSize) {
this(context, maxSize, getDefaultStrategy(), getDefaultAllowedConfigs());
}
/**
* Constructor for LruBitmapPool.
*
* @param maxSize The initial maximum size of the pool in bytes.
* @param allowedConfigs A white listed set of {@link android.graphics.Bitmap.Config} that are allowed to be put
* into the pool. Configs not in the allowed set will be rejected.
*/
@SuppressWarnings("unused")
public LruBitmapPool(Context context, int maxSize, Set<Bitmap.Config> allowedConfigs) {
this(context, maxSize, getDefaultStrategy(), allowedConfigs);
}
private static LruPoolStrategy getDefaultStrategy() {
final LruPoolStrategy strategy;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
strategy = new SizeConfigStrategy();
} else {
strategy = new AttributeStrategy();
}
return strategy;
}
private static Set<Bitmap.Config> getDefaultAllowedConfigs() {
Set<Bitmap.Config> configs = new HashSet<Bitmap.Config>();
configs.addAll(Arrays.asList(Bitmap.Config.values()));
if (Build.VERSION.SDK_INT >= 19) {
configs.add(null);
}
return Collections.unmodifiableSet(configs);
}
@Override
public synchronized boolean put(Bitmap bitmap) {
if (closed) {
return false;
}
if (disabled) {
SLog.w(SLogType.CACHE, logName, "Disabled. Unable put, bitmap=%s,%s",
strategy.logBitmap(bitmap), SketchUtils.toHexString(bitmap));
return false;
}
if (bitmap == null) {
throw new NullPointerException("Bitmap must not be null");
}
if (bitmap.isRecycled() || !bitmap.isMutable() || strategy.getSize(bitmap) > maxSize || !allowedConfigs.contains(bitmap.getConfig())) {
SLog.w(SLogType.CACHE, logName, "Reject bitmap from pool, bitmap: %s, is recycled: %s, is mutable: %s, is allowed config: %s, %s",
strategy.logBitmap(bitmap), bitmap.isRecycled(), bitmap.isMutable(),
allowedConfigs.contains(bitmap.getConfig()), SketchUtils.toHexString(bitmap));
return false;
}
final int size = strategy.getSize(bitmap);
strategy.put(bitmap);
tracker.add(bitmap);
puts++;
currentSize += size;
SLog.v(SLogType.CACHE, logName, "Put bitmap in pool=%s,%s",
strategy.logBitmap(bitmap), SketchUtils.toHexString(bitmap));
dump();
evict();
return true;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
public synchronized Bitmap getDirty(int width, int height, Bitmap.Config config) {
if (closed) {
return null;
}
if (disabled) {
SLog.w(SLogType.CACHE, logName, "Disabled. Unable get, bitmap=%s,%s",
strategy.logBitmap(width, height, config));
return null;
}
// Config will be null for non public config types, which can lead to transformations naively passing in
// null as the requested config here. See issue #194.
final Bitmap result = strategy.get(width, height, config != null ? config : DEFAULT_CONFIG);
if (result == null) {
SLog.w(SLogType.CACHE, logName, "Missing bitmap=%s", strategy.logBitmap(width, height, config));
misses++;
} else {
SLog.i(SLogType.CACHE, logName, "Get bitmap=%s,%s", strategy.logBitmap(width, height, config), SketchUtils.toHexString(result));
hits++;
currentSize -= strategy.getSize(result);
tracker.remove(result);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
result.setHasAlpha(true);
}
}
dump();
return result;
}
@Override
public synchronized Bitmap get(int width, int height, Bitmap.Config config) {
Bitmap result = getDirty(width, height, config);
if (result != null) {
// Bitmaps in the pool contain random data that in some cases must be cleared for an image to be rendered
// correctly. we shouldn't force all consumers to independently erase the contents individually, so we do so
// here. See issue #131.
result.eraseColor(Color.TRANSPARENT);
}
return result;
}
@Override
public Bitmap getOrMake(int width, int height, Bitmap.Config config) {
Bitmap result = get(width, height, config);
if (result == null) {
result = Bitmap.createBitmap(width, height, config);
if (SLogType.CACHE.isEnabled()) {
StackTraceElement[] elements = new Exception().getStackTrace();
StackTraceElement element = elements.length > 1 ? elements[1] : elements[0];
SLog.i(SLogType.CACHE, String.format("Make bitmap. info:%dx%d,%s,%s - %s.%s:%d",
result.getWidth(), result.getHeight(), result.getConfig(), SketchUtils.toHexString(result),
element.getClassName(), element.getMethodName(), element.getLineNumber()));
}
}
return result;
}
private void evict() {
if (closed) {
return;
}
trimToSize(maxSize);
}
@Override
public int getMaxSize() {
return maxSize;
}
@Override
public int getSize() {
return currentSize;
}
@Override
public synchronized void setSizeMultiplier(float sizeMultiplier) {
if (closed) {
return;
}
maxSize = Math.round(initialMaxSize * sizeMultiplier);
evict();
}
@Override
public boolean isDisabled() {
return disabled;
}
@Override
public void setDisabled(boolean disabled) {
this.disabled = disabled;
if (disabled) {
SLog.w(SLogType.CACHE, logName, "setDisabled. %s", true);
} else {
SLog.i(SLogType.CACHE, logName, "setDisabled. %s", false);
}
}
@SuppressLint("InlinedApi")
@Override
public synchronized void trimMemory(int level) {
long size = getSize();
if (level >= android.content.ComponentCallbacks2.TRIM_MEMORY_MODERATE) {
trimToSize(0);
} else if (level >= android.content.ComponentCallbacks2.TRIM_MEMORY_BACKGROUND) {
trimToSize(maxSize / 2);
}
if (SLogType.CACHE.isEnabled()) {
String releasedSize = Formatter.formatFileSize(context, size - getSize());
SLog.w(SLogType.CACHE, logName, "trimMemory. level=%s, released: %s",
SketchUtils.getTrimLevelName(level), releasedSize);
}
}
@Override
public synchronized void clear() {
if (SLogType.CACHE.isEnabled()) {
SLog.w(SLogType.CACHE, logName, "clear. before size %s", Formatter.formatFileSize(context, getSize()));
}
trimToSize(0);
}
@Override
public synchronized boolean isClosed() {
return closed;
}
@Override
public synchronized void close() {
if (closed) {
return;
}
closed = true;
trimToSize(0);
}
private synchronized void trimToSize(int size) {
while (currentSize > size) {
final Bitmap removed = strategy.removeLast();
if (removed == null) {
SLog.w(SLogType.CACHE, logName, "Size mismatch, resetting");
dumpUnchecked();
currentSize = 0;
return;
}
SLog.e(SLogType.CACHE, logName, "Evicting bitmap=%s,%s",
strategy.logBitmap(removed), SketchUtils.toHexString(removed));
tracker.remove(removed);
currentSize -= strategy.getSize(removed);
removed.recycle();
evictions++;
dump();
}
}
private void dump() {
if (Log.isLoggable(logName, Log.VERBOSE)) {
dumpUnchecked();
}
}
private void dumpUnchecked() {
SLog.v(SLogType.CACHE, logName,
"Hits=%d, misses=%d, puts=%d, evictions=%d, currentSize=%d, maxSize=%d, Strategy=%s",
hits, misses, puts, evictions, currentSize, maxSize, strategy);
}
@Override
public String getKey() {
return String.format("%s(maxSize=%s)", logName, Formatter.formatFileSize(context, getMaxSize()));
}
private interface BitmapTracker {
void add(Bitmap bitmap);
void remove(Bitmap bitmap);
}
@SuppressWarnings("unused")
// Only used for debugging
private static class ThrowingBitmapTracker implements BitmapTracker {
private final Set<Bitmap> bitmaps = Collections.synchronizedSet(new HashSet<Bitmap>());
@Override
public void add(Bitmap bitmap) {
if (bitmaps.contains(bitmap)) {
throw new IllegalStateException("Can't add already added bitmap: " + bitmap + " [" + bitmap.getWidth()
+ "x" + bitmap.getHeight() + "]");
}
bitmaps.add(bitmap);
}
@Override
public void remove(Bitmap bitmap) {
if (!bitmaps.contains(bitmap)) {
throw new IllegalStateException("Cannot remove bitmap not in tracker");
}
bitmaps.remove(bitmap);
}
}
private static class NullBitmapTracker implements BitmapTracker {
@Override
public void add(Bitmap bitmap) {
// Do nothing.
}
@Override
public void remove(Bitmap bitmap) {
// Do nothing.
}
}
}