mirror of
https://github.com/nextcloud/talk-android
synced 2025-06-20 12:09:45 +01:00
113 lines
3.8 KiB
Kotlin
113 lines
3.8 KiB
Kotlin
/*
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* Nextcloud Talk application
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*
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* @author Marcel Hibbe
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* Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* 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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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.nextcloud.talk.utils
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import android.graphics.Bitmap
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import android.graphics.BitmapFactory
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import android.graphics.Matrix
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import android.util.Log
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import androidx.exifinterface.media.ExifInterface
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import java.io.IOException
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object BitmapShrinker {
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private val TAG = "BitmapShrinker"
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private const val DEGREES_90 = 90f
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private const val DEGREES_180 = 180f
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private const val DEGREES_270 = 270f
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fun shrinkBitmap(
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path: String,
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reqWidth: Int,
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reqHeight: Int
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): Bitmap {
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val bitmap = decodeBitmap(path, reqWidth, reqHeight)
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return rotateBitmap(path, bitmap)
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}
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// solution inspired by https://developer.android.com/topic/performance/graphics/load-bitmap
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private fun decodeBitmap(
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path: String,
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requestedWidth: Int,
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requestedHeight: Int
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): Bitmap {
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return BitmapFactory.Options().run {
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inJustDecodeBounds = true
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BitmapFactory.decodeFile(path, this)
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inSampleSize = getInSampleSize(this, requestedWidth, requestedHeight)
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inJustDecodeBounds = false
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BitmapFactory.decodeFile(path, this)
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}
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}
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// solution inspired by https://developer.android.com/topic/performance/graphics/load-bitmap
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private fun getInSampleSize(
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options: BitmapFactory.Options,
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requestedWidth: Int,
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requestedHeight: Int
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): Int {
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val (height: Int, width: Int) = options.run { outHeight to outWidth }
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var inSampleSize = 1
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if (height > requestedHeight || width > requestedWidth) {
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val halfHeight: Int = height / 2
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val halfWidth: Int = width / 2
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// "||" was used instead of "&&". Otherwise it would still crash for wide panorama photos.
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while (halfHeight / inSampleSize >= requestedHeight || halfWidth / inSampleSize >= requestedWidth) {
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inSampleSize *= 2
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}
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}
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return inSampleSize
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}
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// solution inspired by https://stackoverflow.com/a/15341203
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private fun rotateBitmap(path: String, bitmap: Bitmap): Bitmap {
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try {
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val exif = ExifInterface(path)
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val orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1)
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val matrix = Matrix()
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when (orientation) {
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ExifInterface.ORIENTATION_ROTATE_90 -> {
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matrix.postRotate(DEGREES_90)
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}
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ExifInterface.ORIENTATION_ROTATE_180 -> {
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matrix.postRotate(DEGREES_180)
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}
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ExifInterface.ORIENTATION_ROTATE_270 -> {
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matrix.postRotate(DEGREES_270)
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}
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}
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val rotatedBitmap = Bitmap.createBitmap(
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bitmap,
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0,
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0,
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bitmap.getWidth(),
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bitmap.getHeight(),
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matrix,
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true
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)
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return rotatedBitmap
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} catch (e: IOException) {
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Log.e(TAG, "error while rotating image", e)
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}
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return bitmap
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}
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}
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