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