将位图转换为灰度
将位图转换为灰度
提问于 2020-03-30 23:18:37
在我的应用程序中，我想上传一个图像到服务器，但是我想在执行that.< br />之前将其转换为灰度，所以我找到了一个函数，它接受位图并返回位图作为灰度。
fun getGrayScale(src: Bitmap): Bitmap {
//Custom color matrix to convert to GrayScale
val matrix = floatArrayOf(
0.3f,
0.59f,
0.11f,
0f,
0f,
0.3f,
0.59f,
0.11f,
0f,
0f,
0.3f,
0.59f,
0.11f,
0f,
0f,
0f,
0f,
0f,
1f,
0f
)
val dest = Bitmap.createBitmap(src.width, src.height, Bitmap.Config.RGB_565)
val canvas = Canvas(dest)
val paint = Paint()
val filter = ColorMatrixColorFilter(matrix)
paint.colorFilter = filter
canvas.drawBitmap(src, 0.toFloat(), 0.toFloat(), paint)
return dest
}它成功运行，但在Android 10中没有运行，在Android 10中，我得到以下异常
java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: Software rendering doesn't support hardware bitmaps
at androidx.work.impl.utils.futures.AbstractFuture.getDoneValue(AbstractFuture.java:516)
at androidx.work.impl.utils.futures.AbstractFuture.get(AbstractFuture.java:475)
at androidx.work.impl.WorkerWrapper$2.run(WorkerWrapper.java:298)
at androidx.work.impl.utils.SerialExecutor$Task.run(SerialExecutor.java:91)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)
Caused by: java.lang.IllegalArgumentException: Software rendering doesn't support hardware bitmaps
at android.graphics.BaseCanvas.onHwBitmapInSwMode(BaseCanvas.java:632)
at android.graphics.BaseCanvas.throwIfHwBitmapInSwMode(BaseCanvas.java:639)
at android.graphics.BaseCanvas.throwIfCannotDraw(BaseCanvas.java:73)
at android.graphics.BaseCanvas.drawBitmap(BaseCanvas.java:113)
at android.graphics.Canvas.drawBitmap(Canvas.java:1540)
at com.example.utilities.ImageUtils.getGrayScale(ImageUtils.kt:64)
at com.example.utilities.FileUtils.imageRefactor(FileUtils.kt:98)
at com.example.workmanager.FileSplitterWorker.doWork(FileSplitterWorker.kt:54)
at androidx.work.CoroutineWorker$startWork$1.invokeSuspend(CoroutineWorker.kt:68)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:241)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:594)
at kotlinx.coroutines.scheduling.CoroutineScheduler.access$runSafely(CoroutineScheduler.kt:60)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:740)我试图在我的清单中将hardwareAccelerated添加为true，但同样的情况也发生了。我能用幻灯片吗，或者用别的方法？
回答 1
Stack Overflow用户
回答已采纳
发布于 2020-04-08 12:34:53
在Android中，他们引入了新的Bitmap.Config，Bitmap.Config.HARDWARE，这是一种实际的优化，当涉及到将Bitmap绘制到屏幕上时。因此，由于您使用的是软件呈现，这就是为什么您会得到错误。
试试这个：
fun getGrayScaleBitmap(original: Bitmap): Bitmap {
// You have to make the Bitmap mutable when changing the config because there will be a crash
// That only mutable Bitmap's should be allowed to change config.
val bmp = original.copy(Bitmap.Config.ARGB_8888, true)
val bmpGrayscale = Bitmap.createBitmap(bmp.width, bmp.height, Bitmap.Config.ARGB_8888)
val canvas = Canvas(bmpGrayscale)
val paint = Paint()
val colorMatrix = ColorMatrix()
colorMatrix.setSaturation(0f)
val colorMatrixFilter = ColorMatrixColorFilter(colorMatrix)
paint.colorFilter = colorMatrixFilter
canvas.drawBitmap(bmp, 0F, 0F, paint)
return bmpGrayscale
}这将取代Bitmap.Config从Bitmap.Config.HARDWARE到Bitmap.Config.ARGB_8888。
希望能帮上忙！
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原文链接：
https://stackoverflow.com/questions/60941076
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