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

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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
comparison
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17:86740f593b6c 18:eedf995462d9
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 import android.graphics.Color 4 import android.graphics.Color
5 import android.util.Log
6 import java.util.concurrent.Callable
5 import kotlin.math.ceil 7 import kotlin.math.ceil
6 import kotlin.math.floor 8 import kotlin.math.floor
7 9
8 /** 10 /**
9 * Bitmapped images designed for efficient resampling and per-pixel access via 11 * Bitmapped images designed for efficient resampling and per-pixel access via
109 if (a == 0.0) 111 if (a == 0.0)
110 return 112 return
111 target[i] = Color.argb(clamp(a), clamp(r/a), clamp(g/a), clamp(b/a)) 113 target[i] = Color.argb(clamp(a), clamp(r/a), clamp(g/a), clamp(b/a))
112 } 114 }
113 115
114 private fun resampleBand(target: Band, weights: Array<Array<IndexWeight>>, source: Band) { 116 private fun makeResampler(target: Band, weights: Array<Array<IndexWeight>>, source: Band): Callable<Exception?> {
115 for (i in 0 until target.size) { 117 return Callable<Exception?> {
116 resample(target, i, weights[i], source) 118 try {
119 for (i in 0 until target.size) {
120 resample(target, i, weights[i], source)
121 }
122 null
123 } catch (e: Exception) {
124 e
125 }
126 }
127 }
128
129 private fun runAndReap(jobs: ArrayList<Callable<Exception?>>) {
130 ThreadPools.WORKERS.invokeAll(jobs).forEach {
131 val exc = it.get()
132 if (exc != null)
133 Log.e("Resizer", "worker thread threw exception", exc)
117 } 134 }
118 } 135 }
119 136
120 /** 137 /**
121 * Resize the horizontal aspect. 138 * Resize the horizontal aspect.
124 * @return A new Resizer object, resampled per specifications 141 * @return A new Resizer object, resampled per specifications
125 */ 142 */
126 fun horizontal(newWidth: Int, kernel: ScalingKernel): Resizer { 143 fun horizontal(newWidth: Int, kernel: ScalingKernel): Resizer {
127 val dst = Resizer(newWidth, height) 144 val dst = Resizer(newWidth, height)
128 val weights = precomputeWeights(newWidth, width, kernel) 145 val weights = precomputeWeights(newWidth, width, kernel)
146 val jobs = ArrayList<Callable<Exception?>>(height)
129 for (y in 0 until height) { 147 for (y in 0 until height) {
130 resampleBand(Row(dst, y), weights, Row(this, y)) 148 jobs.add(makeResampler(Row(dst, y), weights, Row(this, y)))
131 } 149 }
150 runAndReap(jobs)
132 return dst 151 return dst
133 } 152 }
134 153
135 /** 154 /**
136 * Resize the vertical aspect. 155 * Resize the vertical aspect.
139 * @return A new Resizer object, resampled per specifications 158 * @return A new Resizer object, resampled per specifications
140 */ 159 */
141 fun vertical(newHeight: Int, kernel: ScalingKernel): Resizer { 160 fun vertical(newHeight: Int, kernel: ScalingKernel): Resizer {
142 val dst = Resizer(width, newHeight) 161 val dst = Resizer(width, newHeight)
143 val weights = precomputeWeights(newHeight, height, kernel) 162 val weights = precomputeWeights(newHeight, height, kernel)
163 val jobs = ArrayList<Callable<Exception?>>(width)
144 for (x in 0 until width) { 164 for (x in 0 until width) {
145 resampleBand(Column(dst, x), weights, Column(this, x)) 165 jobs.add(makeResampler(Column(dst, x), weights, Column(this, x)))
146 } 166 }
167 runAndReap(jobs)
147 return dst 168 return dst
148 } 169 }
149 } 170 }