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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 com.android.gallery3d.ui;
import com.android.gallery3d.ui.GLRoot.OnGLIdleListener;
import java.util.ArrayDeque;
public class TextureUploader implements OnGLIdleListener {
private static final int INIT_CAPACITY = 64;
private static final int QUOTA_PER_FRAME = 1;
private final ArrayDeque<UploadedTexture> mFgTextures =
new ArrayDeque<UploadedTexture>(INIT_CAPACITY);
private final ArrayDeque<UploadedTexture> mBgTextures =
new ArrayDeque<UploadedTexture>(INIT_CAPACITY);
private final GLRoot mGLRoot;
private volatile boolean mIsQueued = false;
public TextureUploader(GLRoot root) {
mGLRoot = root;
}
public synchronized void clear() {
while (!mFgTextures.isEmpty()) {
mFgTextures.pop().setIsUploading(false);
}
while (!mBgTextures.isEmpty()) {
mBgTextures.pop().setIsUploading(false);
}
}
// caller should hold synchronized on "this"
private void queueSelfIfNeed() {
if (mIsQueued) return;
mIsQueued = true;
mGLRoot.addOnGLIdleListener(this);
}
public synchronized void addBgTexture(UploadedTexture t) {
if (t.isContentValid()) return;
mBgTextures.addLast(t);
t.setIsUploading(true);
queueSelfIfNeed();
}
public synchronized void addFgTexture(UploadedTexture t) {
if (t.isContentValid()) return;
mFgTextures.addLast(t);
t.setIsUploading(true);
queueSelfIfNeed();
}
private int upload(GLCanvas canvas, ArrayDeque<UploadedTexture> deque,
int uploadQuota, boolean isBackground) {
while (uploadQuota > 0) {
UploadedTexture t;
synchronized (this) {
if (deque.isEmpty()) break;
t = deque.removeFirst();
t.setIsUploading(false);
if (t.isContentValid()) continue;
// this has to be protected by the synchronized block
// to prevent the inner bitmap get recycled
t.updateContent(canvas);
}
// It will took some more time for a texture to be drawn for
// the first time.
// Thus, when scrolling, if a new column appears on screen,
// it may cause a UI jank even these textures are uploaded.
if (isBackground) t.draw(canvas, 0, 0);
--uploadQuota;
}
return uploadQuota;
}
@Override
public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) {
int uploadQuota = QUOTA_PER_FRAME;
uploadQuota = upload(canvas, mFgTextures, uploadQuota, false);
if (uploadQuota < QUOTA_PER_FRAME) mGLRoot.requestRender();
upload(canvas, mBgTextures, uploadQuota, true);
synchronized (this) {
mIsQueued = !mFgTextures.isEmpty() || !mBgTextures.isEmpty();
return mIsQueued;
}
}
}
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