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annotate app/src/main/java/com/bartsent/simpleresizer/lib/getScaledInstance.kt @ 15:20da616dcda0

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Add preferences.
author David Barts <n5jrn@me.com>
date Thu, 18 Feb 2021 22:12:19 -0800
parents b1605be35bcc
children 86740f593b6c
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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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2
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3 import android.graphics.Bitmap
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4
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5 private data class IndexWeight(var index: Int, var weight: Double)
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7 /**
20da616dcda0 Add preferences.
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8 * A quality scaler, rather simpler than Image.getScaledInstance in that it has only
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9 * one (slow, high-quality) option.
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10 * @param newWidth Width of new bitmap
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11 * @param newHeight Height of new bitmap
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12 * @return New bitmap
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13 */
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14 fun Bitmap.getScaledInstance(newWidth: Int, newHeight: Int): Bitmap {
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15 if (newWidth <= 0)
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16 throw IllegalArgumentException("invalid width: $newWidth")
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17 if (newHeight <= 0)
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18 throw IllegalArgumentException("invalid height: $newHeight")
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19 if (width == newWidth && height == newHeight)
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20 return this
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b1605be35bcc Dumping Bitmap yields 2x improvement!
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21 return if (width != newWidth) {
b1605be35bcc Dumping Bitmap yields 2x improvement!
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22 Resizer.fromBitmap(this).horizontal(newWidth).let {
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23 if (height == newHeight) it else it.vertical(newHeight)
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e8059b166de1 Lanczos works, but is painfully slow.
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24 }
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25 } else {
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26 Resizer.fromBitmap(this).vertical(newHeight)
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27 } .toBitmap()
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28 }