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.glrenderer; 18 19 import android.graphics.Bitmap; 20 import android.graphics.Bitmap.Config; 21 import android.graphics.Canvas; 22 23 // CanvasTexture is a texture whose content is the drawing on a Canvas. 24 // The subclasses should override onDraw() to draw on the bitmap. 25 // By default CanvasTexture is not opaque. 26 abstract class CanvasTexture extends UploadedTexture { 27 protected Canvas mCanvas; 28 private final Config mConfig; 29 30 public CanvasTexture(int width, int height) { 31 mConfig = Config.ARGB_8888; 32 setSize(width, height); 33 setOpaque(false); 34 } 35 36 @Override 37 protected Bitmap onGetBitmap() { 38 Bitmap bitmap = Bitmap.createBitmap(mWidth, mHeight, mConfig); 39 mCanvas = new Canvas(bitmap); 40 onDraw(mCanvas, bitmap); 41 return bitmap; 42 } 43 44 @Override 45 protected void onFreeBitmap(Bitmap bitmap) { 46 if (!inFinalizer()) { 47 bitmap.recycle(); 48 } 49 } 50 51 abstract protected void onDraw(Canvas canvas, Bitmap backing); 52 } 53
