1 /* 2 * Copyright (C) 2017 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.systemui.statusbar.notification; 18 19 import android.graphics.Bitmap; 20 import android.graphics.BitmapShader; 21 import android.graphics.Canvas; 22 import android.graphics.Color; 23 import android.graphics.ColorMatrix; 24 import android.graphics.ColorMatrixColorFilter; 25 import android.graphics.LinearGradient; 26 import android.graphics.Paint; 27 import android.graphics.PorterDuff; 28 import android.graphics.PorterDuffXfermode; 29 import android.graphics.Shader; 30 import android.graphics.Xfermode; 31 import android.graphics.drawable.Drawable; 32 33 /** 34 * A utility class to colorize bitmaps with a color gradient and a special blending mode 35 */ 36 public class ImageGradientColorizer { 37 public Bitmap colorize(Drawable drawable, int backgroundColor, boolean isRtl) { 38 int width = drawable.getIntrinsicWidth(); 39 int height = drawable.getIntrinsicHeight(); 40 int size = Math.min(width, height); 41 int widthInset = (width - size) / 2; 42 int heightInset = (height - size) / 2; 43 drawable = drawable.mutate(); 44 drawable.setBounds(- widthInset, - heightInset, width - widthInset, height - heightInset); 45 Bitmap newBitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888); 46 Canvas canvas = new Canvas(newBitmap); 47 48 // Values to calculate the luminance of a color 49 float lr = 0.2126f; 50 float lg = 0.7152f; 51 float lb = 0.0722f; 52 53 // Extract the red, green, blue components of the color extraction color in 54 // float and int form 55 int tri = Color.red(backgroundColor); 56 int tgi = Color.green(backgroundColor); 57 int tbi = Color.blue(backgroundColor); 58 59 float tr = tri / 255f; 60 float tg = tgi / 255f; 61 float tb = tbi / 255f; 62 63 // Calculate the luminance of the color extraction color 64 float cLum = (tr * lr + tg * lg + tb * lb) * 255; 65 66 ColorMatrix m = new ColorMatrix(new float[] { 67 lr, lg, lb, 0, tri - cLum, 68 lr, lg, lb, 0, tgi - cLum, 69 lr, lg, lb, 0, tbi - cLum, 70 0, 0, 0, 1, 0, 71 }); 72 73 Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 74 LinearGradient linearGradient = new LinearGradient(0, 0, size, 0, 75 new int[] {0, Color.argb(0.5f, 1, 1, 1), Color.BLACK}, 76 new float[] {0.0f, 0.4f, 1.0f}, Shader.TileMode.CLAMP); 77 paint.setShader(linearGradient); 78 Bitmap fadeIn = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888); 79 Canvas fadeInCanvas = new Canvas(fadeIn); 80 drawable.clearColorFilter(); 81 drawable.draw(fadeInCanvas); 82 83 if (isRtl) { 84 // Let's flip the gradient 85 fadeInCanvas.translate(size, 0); 86 fadeInCanvas.scale(-1, 1); 87 } 88 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); 89 fadeInCanvas.drawPaint(paint); 90 91 Paint coloredPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 92 coloredPaint.setColorFilter(new ColorMatrixColorFilter(m)); 93 coloredPaint.setAlpha((int) (0.5f * 255)); 94 canvas.drawBitmap(fadeIn, 0, 0, coloredPaint); 95 96 linearGradient = new LinearGradient(0, 0, size, 0, 97 new int[] {0, Color.argb(0.5f, 1, 1, 1), Color.BLACK}, 98 new float[] {0.0f, 0.6f, 1.0f}, Shader.TileMode.CLAMP); 99 paint.setShader(linearGradient); 100 fadeInCanvas.drawPaint(paint); 101 canvas.drawBitmap(fadeIn, 0, 0, null); 102 103 return newBitmap; 104 } 105 } 106
