mirror of
https://codeberg.org/Freeyourgadget/Gadgetbridge
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31d2563a18
Co-Authored-By: Arjan Schrijver <arjan5@noreply.codeberg.org> Co-Committed-By: Arjan Schrijver <arjan5@noreply.codeberg.org>
85 lines
2.9 KiB
Java
85 lines
2.9 KiB
Java
/* Copyright (C) 2017-2021 Frank Slezak
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This file is part of Gadgetbridge.
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Gadgetbridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Gadgetbridge is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.util;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.ColorMatrix;
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import android.graphics.ColorMatrixColorFilter;
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import android.graphics.Paint;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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public class BitmapUtil {
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/**
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* Get a Bitmap from any given Drawable.
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*
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* Note that this code will fail if the drawable is 0x0.
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*
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* @param drawable A Drawable to convert.
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* @return A Bitmap representing the drawable.
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*/
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public static Bitmap convertDrawableToBitmap(Drawable drawable) {
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// If whoever made this drawable decided to be nice to us...
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if (drawable instanceof BitmapDrawable) {
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return ((BitmapDrawable) drawable).getBitmap();
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}
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Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(bitmap);
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drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
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drawable.draw(canvas);
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return bitmap;
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}
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/**
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* Change the contrast and brightness on a Bitmap
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*
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* Code from: https://stackoverflow.com/questions/12891520/how-to-programmatically-change-contrast-of-a-bitmap-in-android#17887577
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*
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* @param bmp input bitmap
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* @param contrast 0..10 1 is default
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* @param brightness -255..255 0 is default
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* @return new bitmap
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*/
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public static Bitmap changeBitmapContrastBrightness(Bitmap bmp, float contrast, float brightness)
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{
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ColorMatrix cm = new ColorMatrix(new float[]
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{
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contrast, 0, 0, 0, brightness,
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0, contrast, 0, 0, brightness,
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0, 0, contrast, 0, brightness,
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0, 0, 0, 1, 0
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});
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Bitmap ret = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
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Canvas canvas = new Canvas(ret);
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Paint paint = new Paint();
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paint.setColorFilter(new ColorMatrixColorFilter(cm));
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canvas.drawBitmap(bmp, 0, 0, paint);
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return ret;
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}
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}
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