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annotate app/src/main/java/com/bartsent/simpleresizer/lib/getScaledInstance.kt @ 13:b1605be35bcc memo.oo

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Dumping Bitmap yields 2x improvement!
author David Barts <n5jrn@me.com>
date Thu, 18 Feb 2021 14:15:26 -0800
parents e8059b166de1
children 20da616dcda0
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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 import android.graphics.Canvas
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5 import android.graphics.Color
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6 import android.graphics.Matrix
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7 import kotlin.math.ceil
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8 import kotlin.math.floor
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9
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10 private data class IndexWeight(var index: Int, var weight: Double)
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11
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12 fun Bitmap.getScaledInstance(newWidth: Int, newHeight: Int): Bitmap {
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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 Bitmap.createBitmap(this)
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19 return if (width != newWidth) {
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20 Resizer.fromBitmap(this).horizontal(newWidth).let {
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21 if (height == newHeight) it else it.vertical(newHeight)
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22 }
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23 } else {
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24 Resizer.fromBitmap(this).vertical(newHeight)
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25 } .toBitmap()
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26 }