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annotate app/src/main/java/com/bartsent/simpleresizer/lib/Resizer.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
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children 86740f593b6c
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13
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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.Color
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5 import kotlin.math.ceil
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6 import kotlin.math.floor
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7
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8 /**
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9 * Bitmapped images designed for efficient resampling and per-pixel access via
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10 * subscripting.
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11 */
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12 class Resizer(private val bits: IntArray, val width: Int, val height: Int) {
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13 constructor(width: Int, height: Int) : this(IntArray(width * height), width, height)
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14
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15 companion object {
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16 /**
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17 * Make a Resizer from a standard Bitmap.
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18 * @param image Bitmap object.
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19 * @return A new Resizer.
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20 */
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21 fun fromBitmap(image: Bitmap): Resizer {
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22 val basedOn = IntArray(image.width * image.height)
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23 image.getPixels(basedOn, 0, image.width, 0, 0, image.width, image.height)
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24 return Resizer(basedOn, image.width, image.height)
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25 }
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26 }
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27
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28 private interface Band {
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29 operator fun get(i: Int): Int
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30 operator fun set(i: Int, v: Int): Unit
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31 val index: Int
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32 val size: Int
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33 }
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34
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35 private class Row(val basedOn: Resizer, override val index: Int): Band {
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36 override operator fun get(i: Int) = basedOn[i, index]
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37 override operator fun set(i: Int, v: Int): Unit {
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38 basedOn[i, index] = v
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39 }
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40 override val size; get() = basedOn.width
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41 }
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42
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43 private class Column(val basedOn: Resizer, override val index: Int): Band {
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44 override operator fun get(i: Int) = basedOn[index, i]
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45 override operator fun set(i: Int, v: Int): Unit {
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46 basedOn[index, i] = v
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47 }
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48 override val size; get() = basedOn.height
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49 }
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50
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51 private data class IndexWeight(var index: Int, var weight: Double)
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52
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53 operator fun get(x: Int, y: Int): Int = bits[x + y*width]
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54
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55 operator fun set(x: Int, y: Int, v: Int): Unit {
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56 bits[x + y*width] = v
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57 }
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58
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59 /**
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60 * Return a standard Bitmap based on this Resizer's image.
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61 * @return A new Bitmap, which may share this Resizer's image storage.
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62 */
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63 fun toBitmap(): Bitmap = Bitmap.createBitmap(bits, width, height, Bitmap.Config.ARGB_8888)
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64
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65 private fun precomputeWeights(dstSize: Int, srcSize: Int, filter: ScalingKernel): Array<Array<IndexWeight>> {
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66 val du = srcSize.toDouble() / dstSize.toDouble()
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67 val scale = maxOf(1.0, du)
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68 val ru = ceil(scale * filter.size)
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69 val TEMPLATE = arrayOf<IndexWeight>()
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70 val out = Array<Array<IndexWeight>>(dstSize) { TEMPLATE }
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71 val tmp = ArrayList<IndexWeight>((ru.toInt()+2)*2)
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72 val emax = srcSize - 1
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73
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74 for (v in 0 until dstSize) {
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75 val fu = (v.toDouble()+0.5)*du - 0.5
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76 val begin = maxOf(0, ceil(fu - ru).toInt())
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77 val end = minOf(emax, floor(fu + ru).toInt())
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78 var sum: Double = 0.0
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79 for (u in begin..end) {
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80 val w = filter.weight((u.toDouble() - fu) / scale)
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81 if (w != 0.0) {
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82 sum += w
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83 tmp.add(IndexWeight(u, w))
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84 }
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85 }
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86 if (sum != 0.0) {
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87 tmp.forEach {
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88 it.weight /= sum
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89 }
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90 }
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91 out[v] = tmp.toArray(TEMPLATE)
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92 tmp.clear()
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93 }
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94 return out
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95 }
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96
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97 private fun clamp(v: Double): Int = minOf(255, maxOf(0, (v + 0.5).toInt()))
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98
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99 private fun resample(target: Band, i: Int, weights: Array<IndexWeight>, source: Band): Unit {
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100 var r = 0.0; var g = 0.0; var b = 0.0; var a = 0.0
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101 weights.forEach {
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102 val c = source[it.index]
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103 val aw = Color.alpha(c).toDouble() * it.weight
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104 r += Color.red(c).toDouble() * aw
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105 g += Color.green(c).toDouble() * aw
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106 b += Color.blue(c).toDouble() * aw
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107 a += aw
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108 }
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109 if (a == 0.0)
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110 return
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111 target[i] = Color.argb(clamp(a), clamp(r/a), clamp(g/a), clamp(b/a))
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112 }
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113
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114 private fun resampleBand(target: Band, weights: Array<Array<IndexWeight>>, source: Band) {
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115 for (i in 0 until target.size) {
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116 resample(target, i, weights[i], source)
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117 }
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118 }
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119
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120 private val DEFAULT_KERNEL = LanczosKernel()
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121
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122 /**
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123 * Resize the horizontal aspect.
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124 * @param newWidth Width of new image
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125 * @param kernel Scaling kernel to use (default: LanczosKernel)
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126 * @return A new Resizer object, resampled per specifications
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127 */
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128 fun horizontal(newWidth: Int, kernel: ScalingKernel = DEFAULT_KERNEL): Resizer {
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129 val dst = Resizer(newWidth, height)
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130 val weights = precomputeWeights(newWidth, width, kernel)
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131 for (y in 0 until height) {
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132 resampleBand(Row(dst, y), weights, Row(this, y))
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133 }
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134 return dst
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135 }
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136
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137 /**
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138 * Resize the vertical aspect.
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139 * @param newHeight Height of new image
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140 * @param kernel Scaling kernel to use (default: LanczosKernel)
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141 * @return A new Resizer object, resampled per specifications
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142 */
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143 fun vertical(newHeight: Int, kernel: ScalingKernel = DEFAULT_KERNEL): Resizer {
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144 val dst = Resizer(width, newHeight)
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145 val weights = precomputeWeights(newHeight, height, kernel)
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146 for (x in 0 until width) {
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147 resampleBand(Column(dst, x), weights, Column(this, x))
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148 }
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149 return dst
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150 }
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151 }