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annotate app/src/main/java/com/bartsent/simpleresizer/lib/getScaledInstance.kt @ 17:86740f593b6c

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Better memoization, more rational API.
author David Barts <n5jrn@me.com>
date Sun, 21 Feb 2021 22:14:07 -0800
parents 20da616dcda0
children 19c584b29679
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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 /**
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6 * A quality scaler, rather simpler than Image.getScaledInstance in that it has only
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7 * one (slow, high-quality) option.
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8 * @param newWidth Width of new bitmap
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9 * @param newHeight Height of new bitmap
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10 * @return New bitmap
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11 */
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12 fun Bitmap.getScaledInstance(newWidth: Int, newHeight: Int, kernel: ScalingKernel = LanczosKernel()): Bitmap {
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e8059b166de1 Lanczos works, but is painfully slow.
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13 if (newWidth <= 0)
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14 throw IllegalArgumentException("invalid width: $newWidth")
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15 if (newHeight <= 0)
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16 throw IllegalArgumentException("invalid height: $newHeight")
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17 if (width == newWidth && height == newHeight)
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18 return this
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b1605be35bcc Dumping Bitmap yields 2x improvement!
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19 return if (width != newWidth) {
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20 Resizer.fromBitmap(this).horizontal(newWidth, kernel).let {
86740f593b6c Better memoization, more rational API.
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21 if (height == newHeight) it else it.vertical(newHeight, kernel)
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22 }
e8059b166de1 Lanczos works, but is painfully slow.
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23 } else {
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24 Resizer.fromBitmap(this).vertical(newHeight, kernel)
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25 } .toBitmap()
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26 }