/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.systemui.statusbar.notification;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.ColorMatrix;
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import android.graphics.ColorMatrixColorFilter;
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import android.graphics.LinearGradient;
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import android.graphics.Paint;
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import android.graphics.PorterDuff;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.Shader;
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import android.graphics.drawable.Drawable;
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/**
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* A utility class to colorize bitmaps with a color gradient and a special blending mode
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*/
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public class ImageGradientColorizer {
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public Bitmap colorize(Drawable drawable, int backgroundColor, boolean isRtl) {
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int width = drawable.getIntrinsicWidth();
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int height = drawable.getIntrinsicHeight();
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int size = Math.min(width, height);
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int widthInset = (width - size) / 2;
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int heightInset = (height - size) / 2;
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drawable = drawable.mutate();
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drawable.setBounds(- widthInset, - heightInset, width - widthInset, height - heightInset);
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Bitmap newBitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(newBitmap);
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// Values to calculate the luminance of a color
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float lr = 0.2126f;
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float lg = 0.7152f;
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float lb = 0.0722f;
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// Extract the red, green, blue components of the color extraction color in
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// float and int form
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int tri = Color.red(backgroundColor);
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int tgi = Color.green(backgroundColor);
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int tbi = Color.blue(backgroundColor);
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float tr = tri / 255f;
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float tg = tgi / 255f;
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float tb = tbi / 255f;
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// Calculate the luminance of the color extraction color
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float cLum = (tr * lr + tg * lg + tb * lb) * 255;
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ColorMatrix m = new ColorMatrix(new float[] {
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lr, lg, lb, 0, tri - cLum,
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lr, lg, lb, 0, tgi - cLum,
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lr, lg, lb, 0, tbi - cLum,
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0, 0, 0, 1, 0,
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});
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Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
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LinearGradient linearGradient = new LinearGradient(0, 0, size, 0,
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new int[] {0, Color.argb(0.5f, 1, 1, 1), Color.BLACK},
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new float[] {0.0f, 0.4f, 1.0f}, Shader.TileMode.CLAMP);
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paint.setShader(linearGradient);
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Bitmap fadeIn = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
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Canvas fadeInCanvas = new Canvas(fadeIn);
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drawable.clearColorFilter();
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drawable.draw(fadeInCanvas);
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if (isRtl) {
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// Let's flip the gradient
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fadeInCanvas.translate(size, 0);
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fadeInCanvas.scale(-1, 1);
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}
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paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
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fadeInCanvas.drawPaint(paint);
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Paint coloredPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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coloredPaint.setColorFilter(new ColorMatrixColorFilter(m));
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coloredPaint.setAlpha((int) (0.5f * 255));
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canvas.drawBitmap(fadeIn, 0, 0, coloredPaint);
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linearGradient = new LinearGradient(0, 0, size, 0,
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new int[] {0, Color.argb(0.5f, 1, 1, 1), Color.BLACK},
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new float[] {0.0f, 0.6f, 1.0f}, Shader.TileMode.CLAMP);
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paint.setShader(linearGradient);
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fadeInCanvas.drawPaint(paint);
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canvas.drawBitmap(fadeIn, 0, 0, null);
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return newBitmap;
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}
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}
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