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      1 /*
      2  * Copyright (C) 2013 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.launcher3;
     18 
     19 import android.content.Context;
     20 import android.graphics.Bitmap;
     21 import android.graphics.Canvas;
     22 import android.graphics.Rect;
     23 import android.graphics.drawable.Drawable;
     24 
     25 import com.android.gallery3d.glrenderer.BasicTexture;
     26 import com.android.gallery3d.glrenderer.BitmapTexture;
     27 import com.android.photos.views.TiledImageRenderer;
     28 
     29 public class DrawableTileSource implements TiledImageRenderer.TileSource {
     30     private static final int GL_SIZE_LIMIT = 2048;
     31     // This must be no larger than half the size of the GL_SIZE_LIMIT
     32     // due to decodePreview being allowed to be up to 2x the size of the target
     33     public static final int MAX_PREVIEW_SIZE = GL_SIZE_LIMIT / 2;
     34 
     35     private int mTileSize;
     36     private int mPreviewSize;
     37     private Drawable mDrawable;
     38     private BitmapTexture mPreview;
     39 
     40     public DrawableTileSource(Context context, Drawable d, int previewSize) {
     41         mTileSize = TiledImageRenderer.suggestedTileSize(context);
     42         mDrawable = d;
     43         mPreviewSize = Math.min(previewSize, MAX_PREVIEW_SIZE);
     44     }
     45 
     46     @Override
     47     public int getTileSize() {
     48         return mTileSize;
     49     }
     50 
     51     @Override
     52     public int getImageWidth() {
     53         return mDrawable.getIntrinsicWidth();
     54     }
     55 
     56     @Override
     57     public int getImageHeight() {
     58         return mDrawable.getIntrinsicHeight();
     59     }
     60 
     61     @Override
     62     public int getRotation() {
     63         return 0;
     64     }
     65 
     66     @Override
     67     public BasicTexture getPreview() {
     68         if (mPreviewSize == 0) {
     69             return null;
     70         }
     71         if (mPreview == null){
     72             float width = getImageWidth();
     73             float height = getImageHeight();
     74             while (width > MAX_PREVIEW_SIZE || height > MAX_PREVIEW_SIZE) {
     75                 width /= 2;
     76                 height /= 2;
     77             }
     78             Bitmap b = Bitmap.createBitmap((int) width, (int) height, Bitmap.Config.ARGB_8888);
     79             Canvas c = new Canvas(b);
     80             mDrawable.setBounds(new Rect(0, 0, (int) width, (int) height));
     81             mDrawable.draw(c);
     82             c.setBitmap(null);
     83             mPreview = new BitmapTexture(b);
     84         }
     85         return mPreview;
     86     }
     87 
     88     @Override
     89     public Bitmap getTile(int level, int x, int y, Bitmap bitmap) {
     90         int tileSize = getTileSize();
     91         if (bitmap == null) {
     92             bitmap = Bitmap.createBitmap(tileSize, tileSize, Bitmap.Config.ARGB_8888);
     93         }
     94         Canvas c = new Canvas(bitmap);
     95         Rect bounds = new Rect(0, 0, getImageWidth(), getImageHeight());
     96         bounds.offset(-x, -y);
     97         mDrawable.setBounds(bounds);
     98         mDrawable.draw(c);
     99         c.setBitmap(null);
    100         return bitmap;
    101     }
    102 }
    103