mirror of https://codeberg.org/gitnex/GitNex.git
54 lines
1.2 KiB
Java
54 lines
1.2 KiB
Java
package org.mian.gitnex.helpers;
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import android.graphics.Bitmap;
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import android.graphics.Color;
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import android.graphics.drawable.BitmapDrawable;
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import android.widget.ImageView;
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import androidx.annotation.ColorInt;
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import androidx.annotation.NonNull;
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/**
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* Author M M Arif
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*/
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public class ColorInverter {
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@ColorInt
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public int getContrastColor(@ColorInt int color) {
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double a = 1 - (0.299 * Color.red(color) + 0.587 * Color.green(color) + 0.114 * Color.blue(color)) / 255;
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int d = (a < 0.30) ?
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30 : // almost black
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255; // white
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return Color.rgb(d, d, d);
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}
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@ColorInt
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public int getBitmapContrastColor(@NonNull Bitmap bitmap) {
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int colorSum = 0;
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int divisionValue = 0;
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for(int height=0; height<bitmap.getHeight(); height += 10) {
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for(int width=0; width<bitmap.getWidth(); width += 10) {
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colorSum += bitmap.getPixel(width, height);
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divisionValue++;
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}
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}
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// Calculate average color
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return getContrastColor(colorSum / divisionValue);
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}
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@ColorInt
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public int getImageViewContrastColor(@NonNull ImageView imageView) {
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return getBitmapContrastColor(((BitmapDrawable) imageView.getDrawable()).getBitmap());
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}
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}
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