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annotate app/src/main/java/com/bartsent/simpleresizer/lib/getScaledInstance.kt @ 35:6607f675a5f7

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Add licensing.
author David Barts <n5jrn@me.com>
date Thu, 11 Mar 2021 22:41:48 -0800
parents 19c584b29679
children
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e8059b166de1 Lanczos works, but is painfully slow.
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1 package com.bartsent.simpleresizer.lib
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3 /*
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4 * Some code in this file has been adapted from: https://github.com/disintegration/imaging/ .
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5 */
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7 import android.graphics.Bitmap
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9 /**
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10 * A quality scaler, rather simpler than Image.getScaledInstance in that it
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11 * currently has only one (slow, high-quality) option.
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12 * @param newWidth Width of new bitmap
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13 * @param newHeight Height of new bitmap
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14 * @return New bitmap
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15 */
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16 fun Bitmap.getScaledInstance(newWidth: Int, newHeight: Int, kernel: ScalingKernel = LanczosKernel()): Bitmap {
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17 if (newWidth <= 0)
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18 throw IllegalArgumentException("invalid width: $newWidth")
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19 if (newHeight <= 0)
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20 throw IllegalArgumentException("invalid height: $newHeight")
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21 if (width == newWidth && height == newHeight)
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22 return this
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23 return if (width != newWidth) {
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24 Resizer.fromBitmap(this).horizontal(newWidth, kernel).let {
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25 if (height == newHeight) it else it.vertical(newHeight, kernel)
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26 }
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27 } else {
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28 Resizer.fromBitmap(this).vertical(newHeight, kernel)
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29 } .toBitmap()
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30 }