1 /* 2 * Copyright (C) 2007 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.example.android.apis.graphics; 18 19 import android.content.Context; 20 import android.graphics.*; 21 import android.os.Bundle; 22 import android.view.*; 23 24 import java.io.ByteArrayOutputStream; 25 26 public class CreateBitmap extends GraphicsActivity { 27 28 @Override onCreate(Bundle savedInstanceState)29 protected void onCreate(Bundle savedInstanceState) { 30 super.onCreate(savedInstanceState); 31 setContentView(new SampleView(this)); 32 } 33 34 private static final int WIDTH = 50; 35 private static final int HEIGHT = 50; 36 private static final int STRIDE = 64; // must be >= WIDTH 37 createColors()38 private static int[] createColors() { 39 int[] colors = new int[STRIDE * HEIGHT]; 40 for (int y = 0; y < HEIGHT; y++) { 41 for (int x = 0; x < WIDTH; x++) { 42 int r = x * 255 / (WIDTH - 1); 43 int g = y * 255 / (HEIGHT - 1); 44 int b = 255 - Math.min(r, g); 45 int a = Math.max(r, g); 46 colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b; 47 } 48 } 49 return colors; 50 } 51 52 private static class SampleView extends View { 53 private Bitmap[] mBitmaps; 54 private Bitmap[] mJPEG; 55 private Bitmap[] mPNG; 56 private int[] mColors; 57 private Paint mPaint; 58 codec(Bitmap src, Bitmap.CompressFormat format, int quality)59 private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format, 60 int quality) { 61 ByteArrayOutputStream os = new ByteArrayOutputStream(); 62 src.compress(format, quality, os); 63 64 byte[] array = os.toByteArray(); 65 return BitmapFactory.decodeByteArray(array, 0, array.length); 66 } 67 SampleView(Context context)68 public SampleView(Context context) { 69 super(context); 70 setFocusable(true); 71 72 mColors = createColors(); 73 int[] colors = mColors; 74 75 mBitmaps = new Bitmap[6]; 76 // these three are initialized with colors[] 77 mBitmaps[0] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, 78 Bitmap.Config.ARGB_8888); 79 mBitmaps[1] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, 80 Bitmap.Config.RGB_565); 81 mBitmaps[2] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, 82 Bitmap.Config.ARGB_4444); 83 84 // these three will have their colors set later 85 mBitmaps[3] = Bitmap.createBitmap(WIDTH, HEIGHT, 86 Bitmap.Config.ARGB_8888); 87 mBitmaps[4] = Bitmap.createBitmap(WIDTH, HEIGHT, 88 Bitmap.Config.RGB_565); 89 mBitmaps[5] = Bitmap.createBitmap(WIDTH, HEIGHT, 90 Bitmap.Config.ARGB_4444); 91 for (int i = 3; i <= 5; i++) { 92 mBitmaps[i].setPixels(colors, 0, STRIDE, 0, 0, WIDTH, HEIGHT); 93 } 94 95 mPaint = new Paint(); 96 mPaint.setDither(true); 97 98 // now encode/decode using JPEG and PNG 99 mJPEG = new Bitmap[mBitmaps.length]; 100 mPNG = new Bitmap[mBitmaps.length]; 101 for (int i = 0; i < mBitmaps.length; i++) { 102 mJPEG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.JPEG, 80); 103 mPNG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.PNG, 0); 104 } 105 } 106 onDraw(Canvas canvas)107 @Override protected void onDraw(Canvas canvas) { 108 canvas.drawColor(Color.WHITE); 109 110 for (int i = 0; i < mBitmaps.length; i++) { 111 canvas.drawBitmap(mBitmaps[i], 0, 0, null); 112 canvas.drawBitmap(mJPEG[i], 80, 0, null); 113 canvas.drawBitmap(mPNG[i], 160, 0, null); 114 canvas.translate(0, mBitmaps[i].getHeight()); 115 } 116 117 // draw the color array directly, w/o craeting a bitmap object 118 canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, 119 true, null); 120 canvas.translate(0, HEIGHT); 121 canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, 122 false, mPaint); 123 } 124 } 125 } 126 127