1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.ui; 18 19 import com.android.gallery3d.common.Utils; 20 21 import android.os.SystemClock; 22 23 // FadeInTexture is a texture which begins with a color, then gradually animates 24 // into a given texture. 25 public class FadeInTexture implements Texture { 26 private static final String TAG = "FadeInTexture"; 27 28 // The duration of the animation in milliseconds 29 private static final int DURATION = 180; 30 31 private final BasicTexture mTexture; 32 private final int mColor; 33 private final long mStartTime; 34 private final int mWidth; 35 private final int mHeight; 36 private final boolean mIsOpaque; 37 private boolean mIsAnimating; 38 39 public FadeInTexture(int color, BasicTexture texture) { 40 mColor = color; 41 mTexture = texture; 42 mWidth = mTexture.getWidth(); 43 mHeight = mTexture.getHeight(); 44 mIsOpaque = mTexture.isOpaque(); 45 mStartTime = now(); 46 mIsAnimating = true; 47 } 48 49 public void draw(GLCanvas canvas, int x, int y) { 50 draw(canvas, x, y, mWidth, mHeight); 51 } 52 53 public void draw(GLCanvas canvas, int x, int y, int w, int h) { 54 if (isAnimating()) { 55 canvas.drawMixed(mTexture, mColor, getRatio(), x, y, w, h); 56 } else { 57 mTexture.draw(canvas, x, y, w, h); 58 } 59 } 60 61 public boolean isOpaque() { 62 return mIsOpaque; 63 } 64 65 public int getWidth() { 66 return mWidth; 67 } 68 69 public int getHeight() { 70 return mHeight; 71 } 72 73 public boolean isAnimating() { 74 if (mIsAnimating) { 75 if (now() - mStartTime >= DURATION) { 76 mIsAnimating = false; 77 } 78 } 79 return mIsAnimating; 80 } 81 82 private float getRatio() { 83 float r = (float)(now() - mStartTime) / DURATION; 84 return Utils.clamp(1.0f - r, 0.0f, 1.0f); 85 } 86 87 private long now() { 88 return SystemClock.uptimeMillis(); 89 } 90 } 91