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comparison 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
comparison
equal deleted inserted replaced
16:3ed74dc0e34a 17:86740f593b6c
1 package com.bartsent.simpleresizer.lib 1 package com.bartsent.simpleresizer.lib
2 2
3 import android.graphics.Bitmap 3 import android.graphics.Bitmap
4
5 private data class IndexWeight(var index: Int, var weight: Double)
6 4
7 /** 5 /**
8 * A quality scaler, rather simpler than Image.getScaledInstance in that it has only 6 * A quality scaler, rather simpler than Image.getScaledInstance in that it has only
9 * one (slow, high-quality) option. 7 * one (slow, high-quality) option.
10 * @param newWidth Width of new bitmap 8 * @param newWidth Width of new bitmap
11 * @param newHeight Height of new bitmap 9 * @param newHeight Height of new bitmap
12 * @return New bitmap 10 * @return New bitmap
13 */ 11 */
14 fun Bitmap.getScaledInstance(newWidth: Int, newHeight: Int): Bitmap { 12 fun Bitmap.getScaledInstance(newWidth: Int, newHeight: Int, kernel: ScalingKernel = LanczosKernel()): Bitmap {
15 if (newWidth <= 0) 13 if (newWidth <= 0)
16 throw IllegalArgumentException("invalid width: $newWidth") 14 throw IllegalArgumentException("invalid width: $newWidth")
17 if (newHeight <= 0) 15 if (newHeight <= 0)
18 throw IllegalArgumentException("invalid height: $newHeight") 16 throw IllegalArgumentException("invalid height: $newHeight")
19 if (width == newWidth && height == newHeight) 17 if (width == newWidth && height == newHeight)
20 return this 18 return this
21 return if (width != newWidth) { 19 return if (width != newWidth) {
22 Resizer.fromBitmap(this).horizontal(newWidth).let { 20 Resizer.fromBitmap(this).horizontal(newWidth, kernel).let {
23 if (height == newHeight) it else it.vertical(newHeight) 21 if (height == newHeight) it else it.vertical(newHeight, kernel)
24 } 22 }
25 } else { 23 } else {
26 Resizer.fromBitmap(this).vertical(newHeight) 24 Resizer.fromBitmap(this).vertical(newHeight, kernel)
27 } .toBitmap() 25 } .toBitmap()
28 } 26 }