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