Mercurial > cgi-bin > hgweb.cgi > SimpleResizer

annotate app/src/main/java/com/bartsent/simpleresizer/lib/Resizer.kt @ 18:eedf995462d9 concur2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Parallalized, but ConstraintLayout started hosing the edit window.
author David Barts <n5jrn@me.com>
date Mon, 22 Feb 2021 07:04:31 -0800
parents 86740f593b6c
children 6607f675a5f7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
1 package com.bartsent.simpleresizer.lib
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
2
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
3 import android.graphics.Bitmap
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
4 import android.graphics.Color
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
5 import android.util.Log
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
6 import java.util.concurrent.Callable
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
7 import kotlin.math.ceil
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
8 import kotlin.math.floor
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
9
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
10 /**
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
11 * Bitmapped images designed for efficient resampling and per-pixel access via
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
12 * subscripting.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
13 */
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
14 class Resizer(private val bits: IntArray, val width: Int, val height: Int) {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
15 constructor(width: Int, height: Int) : this(IntArray(width * height), width, height)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
16
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
17 companion object {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
18 /**
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
19 * Make a Resizer from a standard Bitmap.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
20 * @param image Bitmap object.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
21 * @return A new Resizer.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
22 */
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
23 fun fromBitmap(image: Bitmap): Resizer {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
24 val basedOn = IntArray(image.width * image.height)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
25 image.getPixels(basedOn, 0, image.width, 0, 0, image.width, image.height)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
26 return Resizer(basedOn, image.width, image.height)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
27 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
28 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
29
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
30 private interface Band {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
31 operator fun get(i: Int): Int
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
32 operator fun set(i: Int, v: Int): Unit
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
33 val index: Int
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
34 val size: Int
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
35 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
36
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
37 private class Row(val basedOn: Resizer, override val index: Int): Band {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
38 override operator fun get(i: Int) = basedOn[i, index]
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
39 override operator fun set(i: Int, v: Int): Unit {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
40 basedOn[i, index] = v
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
41 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
42 override val size; get() = basedOn.width
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
43 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
44
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
45 private class Column(val basedOn: Resizer, override val index: Int): Band {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
46 override operator fun get(i: Int) = basedOn[index, i]
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
47 override operator fun set(i: Int, v: Int): Unit {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
48 basedOn[index, i] = v
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
49 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
50 override val size; get() = basedOn.height
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
51 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
52
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
53 private data class IndexWeight(var index: Int, var weight: Double)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
54
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
55 operator fun get(x: Int, y: Int): Int = bits[x + y*width]
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
56
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
57 operator fun set(x: Int, y: Int, v: Int): Unit {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
58 bits[x + y*width] = v
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
59 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
60
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
61 /**
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
62 * Return a standard Bitmap based on this Resizer's image.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
63 * @return A new Bitmap, which may share this Resizer's image storage.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
64 */
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
65 fun toBitmap(): Bitmap = Bitmap.createBitmap(bits, width, height, Bitmap.Config.ARGB_8888)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
66
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
67 private fun precomputeWeights(dstSize: Int, srcSize: Int, filter: ScalingKernel): Array<Array<IndexWeight>> {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
68 val du = srcSize.toDouble() / dstSize.toDouble()
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
69 val scale = maxOf(1.0, du)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
70 val ru = ceil(scale * filter.size)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
71 val TEMPLATE = arrayOf<IndexWeight>()
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
72 val out = Array<Array<IndexWeight>>(dstSize) { TEMPLATE }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
73 val tmp = ArrayList<IndexWeight>((ru.toInt()+2)*2)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
74 val emax = srcSize - 1
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
75
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
76 for (v in 0 until dstSize) {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
77 val fu = (v.toDouble()+0.5)*du - 0.5
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
78 val begin = maxOf(0, ceil(fu - ru).toInt())
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
79 val end = minOf(emax, floor(fu + ru).toInt())
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
80 var sum: Double = 0.0
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
81 for (u in begin..end) {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
82 val w = filter.weight((u.toDouble() - fu) / scale)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
83 if (w != 0.0) {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
84 sum += w
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
85 tmp.add(IndexWeight(u, w))
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
86 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
87 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
88 if (sum != 0.0) {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
89 tmp.forEach {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
90 it.weight /= sum
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
91 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
92 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
93 out[v] = tmp.toArray(TEMPLATE)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
94 tmp.clear()
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
95 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
96 return out
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
97 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
98
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
99 private fun clamp(v: Double): Int = minOf(255, maxOf(0, (v + 0.5).toInt()))
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
100
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
101 private fun resample(target: Band, i: Int, weights: Array<IndexWeight>, source: Band): Unit {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
102 var r = 0.0; var g = 0.0; var b = 0.0; var a = 0.0
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
103 weights.forEach {
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
104 val c = source[it.index]
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
105 val aw = Color.alpha(c).toDouble() * it.weight
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
106 r += Color.red(c).toDouble() * aw
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
107 g += Color.green(c).toDouble() * aw
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
108 b += Color.blue(c).toDouble() * aw
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
109 a += aw
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
110 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
111 if (a == 0.0)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
112 return
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
113 target[i] = Color.argb(clamp(a), clamp(r/a), clamp(g/a), clamp(b/a))
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
114 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
115
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
116 private fun makeResampler(target: Band, weights: Array<Array<IndexWeight>>, source: Band): Callable<Exception?> {
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
117 return Callable<Exception?> {
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
118 try {
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
119 for (i in 0 until target.size) {
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
120 resample(target, i, weights[i], source)
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
121 }
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
122 null
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
123 } catch (e: Exception) {
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
124 e
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
125 }
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
126 }
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
127 }
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
128
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
129 private fun runAndReap(jobs: ArrayList<Callable<Exception?>>) {
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
130 ThreadPools.WORKERS.invokeAll(jobs).forEach {
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
131 val exc = it.get()
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
132 if (exc != null)
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
133 Log.e("Resizer", "worker thread threw exception", exc)
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
134 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
135 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
136
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
137 /**
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
138 * Resize the horizontal aspect.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
139 * @param newWidth Width of new image
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
140 * @param kernel Scaling kernel to use (default: LanczosKernel)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
141 * @return A new Resizer object, resampled per specifications
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
142 */
17
86740f593b6c Better memoization, more rational API.
David Barts <n5jrn@me.com>
parents: 13
diff changeset
143 fun horizontal(newWidth: Int, kernel: ScalingKernel): Resizer {
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
144 val dst = Resizer(newWidth, height)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
145 val weights = precomputeWeights(newWidth, width, kernel)
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
146 val jobs = ArrayList<Callable<Exception?>>(height)
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
147 for (y in 0 until height) {
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
148 jobs.add(makeResampler(Row(dst, y), weights, Row(this, y)))
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
149 }
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
150 runAndReap(jobs)
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
151 return dst
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
152 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
153
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
154 /**
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
155 * Resize the vertical aspect.
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
156 * @param newHeight Height of new image
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
157 * @param kernel Scaling kernel to use (default: LanczosKernel)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
158 * @return A new Resizer object, resampled per specifications
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
159 */
17
86740f593b6c Better memoization, more rational API.
David Barts <n5jrn@me.com>
parents: 13
diff changeset
160 fun vertical(newHeight: Int, kernel: ScalingKernel): Resizer {
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
161 val dst = Resizer(width, newHeight)
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
162 val weights = precomputeWeights(newHeight, height, kernel)
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
163 val jobs = ArrayList<Callable<Exception?>>(width)
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
164 for (x in 0 until width) {
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
165 jobs.add(makeResampler(Column(dst, x), weights, Column(this, x)))
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
166 }
18
eedf995462d9 Parallalized, but ConstraintLayout started hosing the edit window.
David Barts <n5jrn@me.com>
parents: 17
diff changeset
167 runAndReap(jobs)
13
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
168 return dst
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
169 }
b1605be35bcc Dumping Bitmap yields 2x improvement!
David Barts <n5jrn@me.com>
parents:
diff changeset
170 }