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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.ui;
import com.android.gallery3d.common.Utils;
import android.os.SystemClock;
// FadeInTexture is a texture which begins with a color, then gradually animates
// into a given texture.
public class FadeInTexture implements Texture {
private static final String TAG = "FadeInTexture";
// The duration of the animation in milliseconds
private static final int DURATION = 180;
private final BasicTexture mTexture;
private final int mColor;
private final long mStartTime;
private final int mWidth;
private final int mHeight;
private final boolean mIsOpaque;
private boolean mIsAnimating;
public FadeInTexture(int color, BasicTexture texture) {
mColor = color;
mTexture = texture;
mWidth = mTexture.getWidth();
mHeight = mTexture.getHeight();
mIsOpaque = mTexture.isOpaque();
mStartTime = now();
mIsAnimating = true;
}
public void draw(GLCanvas canvas, int x, int y) {
draw(canvas, x, y, mWidth, mHeight);
}
public void draw(GLCanvas canvas, int x, int y, int w, int h) {
if (isAnimating()) {
canvas.drawMixed(mTexture, mColor, getRatio(), x, y, w, h);
} else {
mTexture.draw(canvas, x, y, w, h);
}
}
public boolean isOpaque() {
return mIsOpaque;
}
public int getWidth() {
return mWidth;
}
public int getHeight() {
return mHeight;
}
public boolean isAnimating() {
if (mIsAnimating) {
if (now() - mStartTime >= DURATION) {
mIsAnimating = false;
}
}
return mIsAnimating;
}
private 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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