Mercurial > cgi-bin > hgweb.cgi > SimpleResizer

annotate app/src/main/java/com/bartsent/simpleresizer/lib/Resizer.kt @ 35:6607f675a5f7

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Add licensing.
author David Barts <n5jrn@me.com>
date Thu, 11 Mar 2021 22:41:48 -0800
parents eedf995462d9
children
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1 package com.bartsent.simpleresizer.lib
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3 /*
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4 * Some code in this file has been adapted from: https://github.com/disintegration/imaging/ .
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5 */
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6
13
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7 import android.graphics.Bitmap
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8 import android.graphics.Color
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9 import android.util.Log
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10 import java.util.concurrent.Callable
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11 import kotlin.math.ceil
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12 import kotlin.math.floor
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14 /**
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15 * Bitmapped images designed for efficient resampling and per-pixel access via
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16 * subscripting.
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17 */
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18 class Resizer(private val bits: IntArray, val width: Int, val height: Int) {
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19 constructor(width: Int, height: Int) : this(IntArray(width * height), width, height)
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21 companion object {
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22 /**
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23 * Make a Resizer from a standard Bitmap.
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24 * @param image Bitmap object.
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25 * @return A new Resizer.
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26 */
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27 fun fromBitmap(image: Bitmap): Resizer {
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28 val basedOn = IntArray(image.width * image.height)
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29 image.getPixels(basedOn, 0, image.width, 0, 0, image.width, image.height)
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30 return Resizer(basedOn, image.width, image.height)
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31 }
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32 }
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34 private interface Band {
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35 operator fun get(i: Int): Int
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36 operator fun set(i: Int, v: Int): Unit
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37 val index: Int
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38 val size: Int
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39 }
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40
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41 private class Row(val basedOn: Resizer, override val index: Int): Band {
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42 override operator fun get(i: Int) = basedOn[i, index]
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43 override operator fun set(i: Int, v: Int): Unit {
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44 basedOn[i, index] = v
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45 }
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46 override val size; get() = basedOn.width
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47 }
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49 private class Column(val basedOn: Resizer, override val index: Int): Band {
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50 override operator fun get(i: Int) = basedOn[index, i]
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51 override operator fun set(i: Int, v: Int): Unit {
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52 basedOn[index, i] = v
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53 }
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54 override val size; get() = basedOn.height
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55 }
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57 private data class IndexWeight(var index: Int, var weight: Double)
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58
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59 operator fun get(x: Int, y: Int): Int = bits[x + y*width]
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60
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61 operator fun set(x: Int, y: Int, v: Int): Unit {
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62 bits[x + y*width] = v
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63 }
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64
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65 /**
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66 * Return a standard Bitmap based on this Resizer's image.
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67 * @return A new Bitmap, which may share this Resizer's image storage.
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68 */
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69 fun toBitmap(): Bitmap = Bitmap.createBitmap(bits, width, height, Bitmap.Config.ARGB_8888)
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70
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71 private fun precomputeWeights(dstSize: Int, srcSize: Int, filter: ScalingKernel): Array<Array<IndexWeight>> {
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72 val du = srcSize.toDouble() / dstSize.toDouble()
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73 val scale = maxOf(1.0, du)
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74 val ru = ceil(scale * filter.size)
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75 val TEMPLATE = arrayOf<IndexWeight>()
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76 val out = Array<Array<IndexWeight>>(dstSize) { TEMPLATE }
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77 val tmp = ArrayList<IndexWeight>((ru.toInt()+2)*2)
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78 val emax = srcSize - 1
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79
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80 for (v in 0 until dstSize) {
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81 val fu = (v.toDouble()+0.5)*du - 0.5
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82 val begin = maxOf(0, ceil(fu - ru).toInt())
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83 val end = minOf(emax, floor(fu + ru).toInt())
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84 var sum: Double = 0.0
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85 for (u in begin..end) {
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86 val w = filter.weight((u.toDouble() - fu) / scale)
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87 if (w != 0.0) {
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88 sum += w
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89 tmp.add(IndexWeight(u, w))
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90 }
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91 }
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92 if (sum != 0.0) {
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93 tmp.forEach {
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94 it.weight /= sum
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95 }
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96 }
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97 out[v] = tmp.toArray(TEMPLATE)
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98 tmp.clear()
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99 }
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100 return out
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101 }
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102
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103 private fun clamp(v: Double): Int = minOf(255, maxOf(0, (v + 0.5).toInt()))
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104
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105 private fun resample(target: Band, i: Int, weights: Array<IndexWeight>, source: Band): Unit {
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106 var r = 0.0; var g = 0.0; var b = 0.0; var a = 0.0
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107 weights.forEach {
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108 val c = source[it.index]
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109 val aw = Color.alpha(c).toDouble() * it.weight
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110 r += Color.red(c).toDouble() * aw
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111 g += Color.green(c).toDouble() * aw
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112 b += Color.blue(c).toDouble() * aw
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113 a += aw
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114 }
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115 if (a == 0.0)
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116 return
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117 target[i] = Color.argb(clamp(a), clamp(r/a), clamp(g/a), clamp(b/a))
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118 }
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119
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120 private fun makeResampler(target: Band, weights: Array<Array<IndexWeight>>, source: Band): Callable<Exception?> {
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121 return Callable<Exception?> {
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122 try {
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123 for (i in 0 until target.size) {
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124 resample(target, i, weights[i], source)
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125 }
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126 null
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127 } catch (e: Exception) {
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128 e
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129 }
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130 }
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131 }
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132
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133 private fun runAndReap(jobs: ArrayList<Callable<Exception?>>) {
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134 ThreadPools.WORKERS.invokeAll(jobs).forEach {
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135 val exc = it.get()
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136 if (exc != null)
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137 Log.e("Resizer", "worker thread threw exception", exc)
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138 }
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139 }
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140
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141 /**
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142 * Resize the horizontal aspect.
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143 * @param newWidth Width of new image
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144 * @param kernel Scaling kernel to use (default: LanczosKernel)
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145 * @return A new Resizer object, resampled per specifications
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146 */
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147 fun horizontal(newWidth: Int, kernel: ScalingKernel): Resizer {
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148 val dst = Resizer(newWidth, height)
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149 val weights = precomputeWeights(newWidth, width, kernel)
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150 val jobs = ArrayList<Callable<Exception?>>(height)
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151 for (y in 0 until height) {
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152 jobs.add(makeResampler(Row(dst, y), weights, Row(this, y)))
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153 }
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154 runAndReap(jobs)
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155 return dst
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156 }
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157
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158 /**
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159 * Resize the vertical aspect.
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160 * @param newHeight Height of new image
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161 * @param kernel Scaling kernel to use (default: LanczosKernel)
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162 * @return A new Resizer object, resampled per specifications
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163 */
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164 fun vertical(newHeight: Int, kernel: ScalingKernel): Resizer {
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165 val dst = Resizer(width, newHeight)
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166 val weights = precomputeWeights(newHeight, height, kernel)
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167 val jobs = ArrayList<Callable<Exception?>>(width)
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168 for (x in 0 until width) {
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169 jobs.add(makeResampler(Column(dst, x), weights, Column(this, x)))
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170 }
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171 runAndReap(jobs)
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172 return dst
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173 }
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174 }