| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.android.apis.graphics; |
| |
| import android.content.Context; |
| import android.graphics.*; |
| import android.os.Bundle; |
| import android.view.*; |
| |
| import java.io.ByteArrayOutputStream; |
| |
| public class CreateBitmap extends GraphicsActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(new SampleView(this)); |
| } |
| |
| private static final int WIDTH = 50; |
| private static final int HEIGHT = 50; |
| private static final int STRIDE = 64; // must be >= WIDTH |
| |
| private static int[] createColors() { |
| int[] colors = new int[STRIDE * HEIGHT]; |
| for (int y = 0; y < HEIGHT; y++) { |
| for (int x = 0; x < WIDTH; x++) { |
| int r = x * 255 / (WIDTH - 1); |
| int g = y * 255 / (HEIGHT - 1); |
| int b = 255 - Math.min(r, g); |
| int a = Math.max(r, g); |
| colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b; |
| } |
| } |
| return colors; |
| } |
| |
| private static class SampleView extends View { |
| private Bitmap[] mBitmaps; |
| private Bitmap[] mJPEG; |
| private Bitmap[] mPNG; |
| private int[] mColors; |
| private Paint mPaint; |
| |
| private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format, |
| int quality) { |
| ByteArrayOutputStream os = new ByteArrayOutputStream(); |
| src.compress(format, quality, os); |
| |
| byte[] array = os.toByteArray(); |
| return BitmapFactory.decodeByteArray(array, 0, array.length); |
| } |
| |
| public SampleView(Context context) { |
| super(context); |
| setFocusable(true); |
| |
| mColors = createColors(); |
| int[] colors = mColors; |
| |
| mBitmaps = new Bitmap[6]; |
| // these three are initialized with colors[] |
| mBitmaps[0] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, |
| Bitmap.Config.ARGB_8888); |
| mBitmaps[1] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, |
| Bitmap.Config.RGB_565); |
| mBitmaps[2] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, |
| Bitmap.Config.ARGB_4444); |
| |
| // these three will have their colors set later |
| mBitmaps[3] = Bitmap.createBitmap(WIDTH, HEIGHT, |
| Bitmap.Config.ARGB_8888); |
| mBitmaps[4] = Bitmap.createBitmap(WIDTH, HEIGHT, |
| Bitmap.Config.RGB_565); |
| mBitmaps[5] = Bitmap.createBitmap(WIDTH, HEIGHT, |
| Bitmap.Config.ARGB_4444); |
| for (int i = 3; i <= 5; i++) { |
| mBitmaps[i].setPixels(colors, 0, STRIDE, 0, 0, WIDTH, HEIGHT); |
| } |
| |
| mPaint = new Paint(); |
| mPaint.setDither(true); |
| |
| // now encode/decode using JPEG and PNG |
| mJPEG = new Bitmap[mBitmaps.length]; |
| mPNG = new Bitmap[mBitmaps.length]; |
| for (int i = 0; i < mBitmaps.length; i++) { |
| mJPEG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.JPEG, 80); |
| mPNG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.PNG, 0); |
| } |
| } |
| |
| @Override protected void onDraw(Canvas canvas) { |
| canvas.drawColor(Color.WHITE); |
| |
| for (int i = 0; i < mBitmaps.length; i++) { |
| canvas.drawBitmap(mBitmaps[i], 0, 0, null); |
| canvas.drawBitmap(mJPEG[i], 80, 0, null); |
| canvas.drawBitmap(mPNG[i], 160, 0, null); |
| canvas.translate(0, mBitmaps[i].getHeight()); |
| } |
| |
| // draw the color array directly, w/o craeting a bitmap object |
| canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, |
| true, null); |
| canvas.translate(0, HEIGHT); |
| canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, |
| false, mPaint); |
| } |
| } |
| } |
| |