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.app.Activity; 20 import android.content.Context; 21 import android.graphics.Bitmap; 22 import android.graphics.BitmapShader; 23 import android.graphics.Canvas; 24 import android.graphics.Color; 25 import android.graphics.Matrix; 26 import android.graphics.Paint; 27 import android.graphics.PorterDuff; 28 import android.graphics.PorterDuffXfermode; 29 import android.graphics.RectF; 30 import android.graphics.Shader; 31 import android.graphics.Xfermode; 32 import android.os.Bundle; 33 import android.view.View; 34 35 public class Xfermodes extends GraphicsActivity { 36 37 // create a bitmap with a circle, used for the "dst" image 38 static Bitmap makeDst(int w, int h) { 39 Bitmap bm = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 40 Canvas c = new Canvas(bm); 41 Paint p = new Paint(Paint.ANTI_ALIAS_FLAG); 42 43 p.setColor(0xFFFFCC44); 44 c.drawOval(new RectF(0, 0, w*3/4, h*3/4), p); 45 return bm; 46 } 47 48 // create a bitmap with a rect, used for the "src" image 49 static Bitmap makeSrc(int w, int h) { 50 Bitmap bm = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 51 Canvas c = new Canvas(bm); 52 Paint p = new Paint(Paint.ANTI_ALIAS_FLAG); 53 54 p.setColor(0xFF66AAFF); 55 c.drawRect(w/3, h/3, w*19/20, h*19/20, p); 56 return bm; 57 } 58 59 @Override 60 protected void onCreate(Bundle savedInstanceState) { 61 super.onCreate(savedInstanceState); 62 setContentView(new SampleView(this)); 63 } 64 65 private static class SampleView extends View { 66 private static final int W = 64; 67 private static final int H = 64; 68 private static final int ROW_MAX = 4; // number of samples per row 69 70 private Bitmap mSrcB; 71 private Bitmap mDstB; 72 private Shader mBG; // background checker-board pattern 73 74 private static final Xfermode[] sModes = { 75 new PorterDuffXfermode(PorterDuff.Mode.CLEAR), 76 new PorterDuffXfermode(PorterDuff.Mode.SRC), 77 new PorterDuffXfermode(PorterDuff.Mode.DST), 78 new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER), 79 new PorterDuffXfermode(PorterDuff.Mode.DST_OVER), 80 new PorterDuffXfermode(PorterDuff.Mode.SRC_IN), 81 new PorterDuffXfermode(PorterDuff.Mode.DST_IN), 82 new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT), 83 new PorterDuffXfermode(PorterDuff.Mode.DST_OUT), 84 new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP), 85 new PorterDuffXfermode(PorterDuff.Mode.DST_ATOP), 86 new PorterDuffXfermode(PorterDuff.Mode.XOR), 87 new PorterDuffXfermode(PorterDuff.Mode.DARKEN), 88 new PorterDuffXfermode(PorterDuff.Mode.LIGHTEN), 89 new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY), 90 new PorterDuffXfermode(PorterDuff.Mode.SCREEN) 91 }; 92 93 private static final String[] sLabels = { 94 "Clear", "Src", "Dst", "SrcOver", 95 "DstOver", "SrcIn", "DstIn", "SrcOut", 96 "DstOut", "SrcATop", "DstATop", "Xor", 97 "Darken", "Lighten", "Multiply", "Screen" 98 }; 99 100 public SampleView(Context context) { 101 super(context); 102 103 mSrcB = makeSrc(W, H); 104 mDstB = makeDst(W, H); 105 106 // make a ckeckerboard pattern 107 Bitmap bm = Bitmap.createBitmap(new int[] { 0xFFFFFFFF, 0xFFCCCCCC, 108 0xFFCCCCCC, 0xFFFFFFFF }, 2, 2, 109 Bitmap.Config.RGB_565); 110 mBG = new BitmapShader(bm, 111 Shader.TileMode.REPEAT, 112 Shader.TileMode.REPEAT); 113 Matrix m = new Matrix(); 114 m.setScale(6, 6); 115 mBG.setLocalMatrix(m); 116 } 117 118 @Override protected void onDraw(Canvas canvas) { 119 canvas.drawColor(Color.WHITE); 120 121 Paint labelP = new Paint(Paint.ANTI_ALIAS_FLAG); 122 labelP.setTextAlign(Paint.Align.CENTER); 123 124 Paint paint = new Paint(); 125 paint.setFilterBitmap(false); 126 127 canvas.translate(15, 35); 128 129 int x = 0; 130 int y = 0; 131 for (int i = 0; i < sModes.length; i++) { 132 // draw the border 133 paint.setStyle(Paint.Style.STROKE); 134 paint.setShader(null); 135 canvas.drawRect(x - 0.5f, y - 0.5f, 136 x + W + 0.5f, y + H + 0.5f, paint); 137 138 // draw the checker-board pattern 139 paint.setStyle(Paint.Style.FILL); 140 paint.setShader(mBG); 141 canvas.drawRect(x, y, x + W, y + H, paint); 142 143 // draw the src/dst example into our offscreen bitmap 144 int sc = canvas.saveLayer(x, y, x + W, y + H, null, 145 Canvas.MATRIX_SAVE_FLAG | 146 Canvas.CLIP_SAVE_FLAG | 147 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 148 Canvas.FULL_COLOR_LAYER_SAVE_FLAG | 149 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 150 canvas.translate(x, y); 151 canvas.drawBitmap(mDstB, 0, 0, paint); 152 paint.setXfermode(sModes[i]); 153 canvas.drawBitmap(mSrcB, 0, 0, paint); 154 paint.setXfermode(null); 155 canvas.restoreToCount(sc); 156 157 // draw the label 158 canvas.drawText(sLabels[i], 159 x + W/2, y - labelP.getTextSize()/2, labelP); 160 161 x += W + 10; 162 163 // wrap around when we've drawn enough for one row 164 if ((i % ROW_MAX) == ROW_MAX - 1) { 165 x = 0; 166 y += H + 30; 167 } 168 } 169 } 170 } 171 } 172 173
