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package com.android.gallery3d.filtershow.cache;
import android.graphics.Bitmap;
import com.android.gallery3d.filtershow.presets.ImagePreset;
import java.nio.ByteBuffer;
public class BitmapCache {
private static final String LOGTAG = "BitmapCache";
static int mNbItems = 20;
private final Bitmap[] mBitmaps = new Bitmap[mNbItems];
private final Object[] mKeys = new Object[mNbItems];
private final long[] mIndices = new long[mNbItems];
private final boolean[] mBusyStatus = new boolean[mNbItems];
private Bitmap mOriginalBitmap = null;
private ByteBuffer mBuffer = null;
private final Bitmap.Config mConfig = Bitmap.Config.ARGB_8888;
private long mIndex = 0;
public void setOriginalBitmap(Bitmap original) {
if (original == null) {
return;
}
mOriginalBitmap = original.copy(mConfig, true);
int size = 4 * original.getWidth() * original.getHeight();
mBuffer = ByteBuffer.allocate(size);
mOriginalBitmap.copyPixelsToBuffer(mBuffer);
mBuffer.rewind();
mOriginalBitmap.copyPixelsFromBuffer(mBuffer);
for (int i = 0; i < mNbItems; i++) {
mBitmaps[i] = mOriginalBitmap.copy(mConfig, true);
}
}
private int getOldestPosition() {
long minIndex = mIndices[0];
int current = 0;
for (int i = 1; i < mNbItems; i++) {
if (!mBusyStatus[i] && minIndex > mIndices[i]) {
minIndex = mIndices[i];
current = i;
}
}
return current;
}
public Bitmap put(ImagePreset preset) {
int pos = getOldestPosition();
return put(preset, pos);
}
public Bitmap put(ImagePreset preset, int pos) {
mBitmaps[pos] = mOriginalBitmap.copy(mConfig, true);
Bitmap bitmap = mBitmaps[pos];
bitmap = preset.apply(bitmap);
mKeys[pos] = preset;
mIndices[pos] = mIndex++;
return bitmap;
}
public int reservePosition(ImagePreset preset) {
for (int i = 1; i < mNbItems; i++) {
if (mKeys[i] == preset && mBusyStatus[i]) {
return -1;
}
}
int pos = getOldestPosition();
mBusyStatus[pos] = true;
mKeys[pos] = preset;
return pos;
}
public void processPosition(int pos) {
ImagePreset preset = (ImagePreset) mKeys[pos];
mBitmaps[pos] = mOriginalBitmap.copy(mConfig, true);
Bitmap bitmap = mBitmaps[pos];
bitmap = preset.apply(bitmap);
mIndices[pos] = mIndex++;
}
public void unlockPosition(int pos) {
mBusyStatus[pos] = false;
}
public Bitmap get(ImagePreset preset) {
int foundPosition = -1;
int currentIndice = 0;
for (int i = 0; i < mNbItems; i++) {
if (mKeys[i] == preset && mBitmaps[i] != null) {
if (mIndices[i] > currentIndice) {
foundPosition = i;
}
}
}
if (foundPosition != -1) {
mIndices[foundPosition] = mIndex++;
return mBitmaps[foundPosition];
}
return null;
}
public void reset(ImagePreset preset) {
for (int i = 0; i < mNbItems; i++) {
if (mKeys[i] == preset && !mBusyStatus[i]) {
mBitmaps[i] = null;
}
}
}
}
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