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      1 /*
      2  * Copyright (C) 2010 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 android.graphics.Bitmap;
     20 import android.graphics.Canvas;
     21 import android.graphics.LightingColorFilter;
     22 import android.graphics.Paint;
     23 
     24 import com.android.gallery3d.anim.FloatAnimation;
     25 
     26 public class AdaptiveBackground extends GLView {
     27 
     28     private static final int BACKGROUND_WIDTH = 128;
     29     private static final int BACKGROUND_HEIGHT = 64;
     30     private static final int FILTERED_COLOR = 0xffaaaaaa;
     31     private static final int ANIMATION_DURATION = 500;
     32 
     33     private BasicTexture mOldBackground;
     34     private BasicTexture mBackground;
     35 
     36     private final Paint mPaint;
     37     private Bitmap mPendingBitmap;
     38     private final FloatAnimation mAnimation =
     39             new FloatAnimation(0, 1, ANIMATION_DURATION);
     40 
     41     public AdaptiveBackground() {
     42         Paint paint = new Paint();
     43         paint.setFilterBitmap(true);
     44         paint.setColorFilter(new LightingColorFilter(FILTERED_COLOR, 0));
     45         mPaint = paint;
     46     }
     47 
     48     public Bitmap getAdaptiveBitmap(Bitmap bitmap) {
     49         Bitmap target = Bitmap.createBitmap(
     50                 BACKGROUND_WIDTH, BACKGROUND_HEIGHT, Bitmap.Config.ARGB_8888);
     51         Canvas canvas = new Canvas(target);
     52         int width = bitmap.getWidth();
     53         int height = bitmap.getHeight();
     54         int left = 0;
     55         int top = 0;
     56         if (width * BACKGROUND_HEIGHT > height * BACKGROUND_WIDTH) {
     57             float scale = (float) BACKGROUND_HEIGHT / height;
     58             canvas.scale(scale, scale);
     59             left = (BACKGROUND_WIDTH - (int) (width * scale + 0.5)) / 2;
     60         } else {
     61             float scale = (float) BACKGROUND_WIDTH / width;
     62             canvas.scale(scale, scale);
     63             top = (BACKGROUND_HEIGHT - (int) (height * scale + 0.5)) / 2;
     64         }
     65         canvas.drawBitmap(bitmap, left, top, mPaint);
     66         BoxBlurFilter.apply(target,
     67                 BoxBlurFilter.MODE_REPEAT, BoxBlurFilter.MODE_CLAMP);
     68         return target;
     69     }
     70 
     71     private void startTransition(Bitmap bitmap) {
     72         BitmapTexture texture = new BitmapTexture(bitmap);
     73         if (mBackground == null) {
     74             mBackground = texture;
     75         } else {
     76             if (mOldBackground != null) mOldBackground.recycle();
     77             mOldBackground = mBackground;
     78             mBackground = texture;
     79             mAnimation.start();
     80         }
     81         invalidate();
     82     }
     83 
     84     public void setImage(Bitmap bitmap) {
     85         if (mAnimation.isActive()) {
     86             mPendingBitmap = bitmap;
     87         } else {
     88             startTransition(bitmap);
     89         }
     90     }
     91 
     92     public void setScrollPosition(int position) {
     93         if (mScrollX == position) return;
     94         mScrollX = position;
     95         invalidate();
     96     }
     97 
     98     @Override
     99     protected void render(GLCanvas canvas) {
    100         if (mBackground == null) return;
    101 
    102         int height = getHeight();
    103         float scale = (float) height / BACKGROUND_HEIGHT;
    104         int width = (int) (BACKGROUND_WIDTH * scale + 0.5f);
    105         int scroll = mScrollX;
    106         int start = (scroll / width) * width;
    107 
    108         if (mOldBackground == null) {
    109             for (int i = start, n = scroll + getWidth(); i < n; i += width) {
    110                 mBackground.draw(canvas, i - scroll, 0, width, height);
    111             }
    112         } else {
    113             boolean moreAnimation =
    114                     mAnimation.calculate(canvas.currentAnimationTimeMillis());
    115             float ratio = mAnimation.get();
    116             for (int i = start, n = scroll + getWidth(); i < n; i += width) {
    117                 canvas.drawMixed(mOldBackground,
    118                         mBackground, ratio, i - scroll, 0, width, height);
    119             }
    120             if (moreAnimation) {
    121                 invalidate();
    122             } else if (mPendingBitmap != null) {
    123                 startTransition(mPendingBitmap);
    124                 mPendingBitmap = null;
    125             }
    126         }
    127     }
    128 }
    129