将位图转换为灰度图像

Question

在我的应用程序中，我想要将一张图片上传到服务器，但是在这之前我希望将其转换为灰度图像。<br/> 因此，我找到了一个函数，它接受一个位图并返回一个灰度位图。

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
    }

代码能够成功运行，但在 Android 10 上却失败了，出现了以下异常信息。

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)

我尝试在清单文件中将hardwareAccelerated设置为true，但结果还是一样的。 我能否使用Glide或其他方式来解决这个问题？

- james04

Answer 1

在Android O中，他们引入了新的Bitmap.Config，即Bitmap.Config.HARDWARE。当涉及到将Bitmap绘制到屏幕上时，这是一种实际的优化。所以，由于您正在使用软件渲染，这就是为什么会出现错误的原因。

尝试这个：

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
}

这将把Bitmap.Config从Bitmap.Config.HARDWARE替换为Bitmap.Config.ARGB_8888。

希望这能有所帮助！

- Kostas Drak