/* Copyright (C) 2017-2024 Arjan Schrijver, Frank Slezak, HelloCodeberg,
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José Rebelo
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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 <https://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.Matrix;
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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.Rect;
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import android.graphics.RectF;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import androidx.annotation.Nullable;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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public class BitmapUtil {
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private static final Logger LOG = LoggerFactory.getLogger(BitmapUtil.class);
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/**
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* Downscale a bitmap to a maximum resolution. Doesn't scale if the bitmap is already smaller than the max resolution.
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*
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* @param bitmap
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* @param maxWidth
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* @param maxHeight
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* @return
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*/
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public static Bitmap scaleWithMax(Bitmap bitmap, int maxWidth, int maxHeight) {
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// Scale image only if necessary
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if ((bitmap.getWidth() > maxWidth) || (bitmap.getHeight() > maxHeight)) {
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bitmap = Bitmap.createScaledBitmap(bitmap, maxWidth, maxHeight, true);
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}
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return bitmap;
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}
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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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* Converts the provided Bitmap to grayscale.
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*
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* @param bitmap
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* @return
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*/
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public static Bitmap convertToGrayscale(Bitmap bitmap) {
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Canvas c = new Canvas(bitmap);
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Paint paint = new Paint();
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ColorMatrix cm = new ColorMatrix();
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cm.setSaturation(0);
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ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
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paint.setColorFilter(f);
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c.drawBitmap(bitmap, 0, 0, paint);
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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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* Invert the colors of a Bitmap
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*
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* @param bmp input bitmap
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* @return new bitmap
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*/
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public static Bitmap invertBitmapColors(Bitmap bmp)
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{
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ColorMatrix colorMatrix_Inverted =
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new ColorMatrix(new float[] {
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-1, 0, 0, 0, 255,
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0, -1, 0, 0, 255,
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0, 0, -1, 0, 255,
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0, 0, 0, 1, 0});
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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(colorMatrix_Inverted));
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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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* Crops a circular image from the center of the provided Bitmap.
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* From: https://www.tutorialspoint.com/android-how-to-crop-circular-area-from-bitmap
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* @param srcBitmap
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* @return
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*/
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public static Bitmap getCircularBitmap(Bitmap srcBitmap) {
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// Calculate the circular bitmap width with border
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int squareBitmapWidth = Math.min(srcBitmap.getWidth(), srcBitmap.getHeight());
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// Initialize a new instance of Bitmap
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Bitmap dstBitmap = Bitmap.createBitmap (
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squareBitmapWidth, // Width
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squareBitmapWidth, // Height
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Bitmap.Config.ARGB_8888 // Config
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);
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Canvas canvas = new Canvas(dstBitmap);
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// Initialize a new Paint instance
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Paint paint = new Paint();
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paint.setAntiAlias(true);
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Rect rect = new Rect(0, 0, squareBitmapWidth, squareBitmapWidth);
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RectF rectF = new RectF(rect);
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canvas.drawOval(rectF, paint);
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paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
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// Calculate the left and top of copied bitmap
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float left = (squareBitmapWidth-srcBitmap.getWidth())/2;
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float top = (squareBitmapWidth-srcBitmap.getHeight())/2;
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canvas.drawBitmap(srcBitmap, left, top, paint);
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// Return the circular bitmap
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return dstBitmap;
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}
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/**
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* Rotates a given Bitmap
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* @param bitmap input bitmap
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* @param degree int Degree of rotation
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* @return new bitmap
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*/
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public static Bitmap rotateImage(Bitmap bitmap, int degree) {
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Matrix matrix = new Matrix();
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matrix.postRotate(degree);
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return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
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}
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/**
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* Overlays two bitmaps on top of each other,
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* bmp1 is assumed to be larger or equal to bmp2
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* From: https://stackoverflow.com/a/2287218
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* @param bmp1
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* @param bmp2
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* @return new Bitmap
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*/
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public static Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {
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Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), bmp1.getConfig());
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Canvas canvas = new Canvas(bmOverlay);
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canvas.drawBitmap(bmp1, new Matrix(), null);
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canvas.drawBitmap(bmp2, new Matrix(), null);
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return bmOverlay;
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}
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/**
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* Converts a {@link Drawable} to a {@link Bitmap}, in ARGB8888 mode.
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*
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* @param drawable the {@link Drawable}
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* @return the {@link Bitmap}
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*/
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public static Bitmap toBitmap(final Drawable drawable) {
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if (drawable instanceof BitmapDrawable) {
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return ((BitmapDrawable) drawable).getBitmap();
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}
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final Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
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final 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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* Converts a {@link Bitmap} to an uncompressed TGA image, as raw bytes, in RGB565 encoding.
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* @param bmp the {@link Bitmap} to convert.
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* @param width the target width
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* @param height the target height
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* @param id the TGA ID
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* @return the raw bytes for the TGA image
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*/
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public static byte[] convertToTgaRGB565(final Bitmap bmp, final int width, final int height, final byte[] id) {
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final Bitmap bmp565;
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if (bmp.getConfig().equals(Bitmap.Config.RGB_565) && bmp.getWidth() == width && bmp.getHeight() == height) {
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// Right encoding and size
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bmp565 = bmp;
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} else {
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// Convert encoding / scale
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bmp565 = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
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final Canvas canvas = new Canvas(bmp565);
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final Rect rect = new Rect(0, 0, width, height);
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canvas.drawBitmap(bmp, null, rect, null);
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}
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int size = bmp565.getRowBytes() * bmp565.getHeight();
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final ByteBuffer bmp565buf = ByteBuffer.allocate(size);
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bmp565.copyPixelsToBuffer(bmp565buf);
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// As per https://en.wikipedia.org/wiki/Truevision_TGA
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// 18 bytes
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final byte[] header = {
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// ID length
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(byte) id.length,
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// Color map type - (0 - no color map)
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0x00,
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// Image type (2 - uncompressed true-color image)
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0x02,
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// Color map specification (5 bytes)
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0x00, 0x00, // first entry index
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0x00, 0x00, /// color map length
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0x00, // color map entry size
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// Image dimensions and format (10 bytes)
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0x00, 0x00, // x origin
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0x00, 0x00, // y origin
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(byte) (width & 0xff), (byte) ((width >> 8) & 0xff), // width
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(byte) (height & 0xff), (byte) ((height >> 8) & 0xff), // height
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16, // bits per pixel (10)
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0x20, // image descriptor (0x20, 00100000)
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// bits 3-0 give the alpha channel depth, bits 5-4 give pixel ordering
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// Bit 4 of the image descriptor byte indicates right-to-left pixel ordering if set.
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// Bit 5 indicates an ordering of top-to-bottom. Otherwise, pixels are stored in bottom-to-top, left-to-right order.
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};
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final ByteBuffer tga565buf = ByteBuffer.allocate(header.length + id.length + size);
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tga565buf.put(header);
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tga565buf.put(id);
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tga565buf.put(bmp565buf.array());
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return tga565buf.array();
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}
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public static boolean isPng(final byte[] data) {
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return ArrayUtils.equals(data, new byte[] {(byte) 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a}, 0);
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}
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@Nullable
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public static Bitmap decodeTga(final byte[] bytes) {
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final ByteBuffer buf = ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN);
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final byte idLength = buf.get();
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final byte colorMapType = buf.get();
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final byte imageType = buf.get();
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final short colorMapFirstEntryIndex = buf.getShort();
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final short colorMapLength = buf.getShort();
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final byte colorMapEntrySize = buf.get();
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final short xOrigin = buf.getShort();
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final short yOrigin = buf.getShort();
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final short width = buf.getShort();
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final short height = buf.getShort();
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final byte bitsPerPixel = buf.get();
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final byte imageDescriptor = buf.get();
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final byte[] id = new byte[idLength];
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buf.get(id);
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if (imageType== 2 && colorMapType == 0) {
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// Parse true-color uncompressed image data as RGB565
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final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
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bitmap.copyPixelsFromBuffer(buf);
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return bitmap;
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}
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if (colorMapType != 0x01) {
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LOG.warn("Unknown color map type {}", colorMapType);
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return null;
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}
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if (colorMapEntrySize != 32) {
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LOG.warn("Color map entry size {} not supported", colorMapEntrySize);
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return null;
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}
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final int[] colorMap = new int[colorMapLength];
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for (int i = 0; i < colorMapLength; i++) {
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colorMap[i] = buf.getInt();
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}
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final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
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switch (imageType) {
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case 1:
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if (bitsPerPixel != 8) {
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LOG.warn("Unsupported bits per pixel {} for imageType 1", bitsPerPixel);
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return null;
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}
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// uncompressed color-mapped image
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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bitmap.setPixel(x, y, colorMap[buf.get() & 0xff]);
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}
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}
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break;
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case 9:
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// run-length encoded color-mapped image
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int i = 0;
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while (buf.position() < buf.limit()) {
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final byte b = buf.get();
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final int count = (b & 127) + 1;
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if ((b & 128) != 0) {
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// msb 1 - run-length encoded
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final int val = buf.get() & 0xff;
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for (int j = 0; j < count; j++) {
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int y = i / width;
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int x = i % width;
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bitmap.setPixel(x, y, colorMap[val]);
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i++;
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}
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} else {
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// msb 0 - raw pixels
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for (int j = 0; j < count; j++) {
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int y = i / width;
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int x = i % width;
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bitmap.setPixel(x, y, colorMap[buf.get() & 0xff]);
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i++;
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}
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}
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}
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break;
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default:
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LOG.warn("Image type {} not supported", imageType);
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return null;
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}
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final int remainingBytes = buf.limit() - buf.position();
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if (remainingBytes != 0) {
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LOG.warn("There are {} bytes remaining in the buffer", remainingBytes);
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}
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return bitmap;
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}
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}
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