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/*
* Copyright (C) 2011 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.glrenderer;
import com.android.gallery3d.common.Utils;
import com.android.gallery3d.ui.AnimationTime;
// FadeTexture is a texture which fades the given texture along the time.
public abstract class FadeTexture implements Texture {
@SuppressWarnings("unused")
private static final String TAG = "FadeTexture";
// The duration of the fading animation in milliseconds
public static final int DURATION = 180;
private final long mStartTime;
private final int mWidth;
private final int mHeight;
private final boolean mIsOpaque;
private boolean mIsAnimating;
public FadeTexture(int width, int height, boolean opaque) {
mWidth = width;
mHeight = height;
mIsOpaque = opaque;
mStartTime = now();
mIsAnimating = true;
}
@Override
public void draw(GLCanvas canvas, int x, int y) {
draw(canvas, x, y, mWidth, mHeight);
}
@Override
public boolean isOpaque() {
return mIsOpaque;
}
@Override
public int getWidth() {
return mWidth;
}
@Override
public int getHeight() {
return mHeight;
}
public boolean isAnimating() {
if (mIsAnimating) {
if (now() - mStartTime >= DURATION) {
mIsAnimating = false;
}
}
return mIsAnimating;
}
protected float getRatio() {
float r = (float)(now() - mStartTime) / DURATION;
return Utils.clamp(1.0f - r, 0.0f, 1.0f);
}
private long now() {
return AnimationTime.get();
}
}
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