我正在使用下面的代码
public void cropSelection(){
Bitmap bitmap = annotationBitmap.copy(annotationBitmap.getConfig(), true);
Canvas canvas = new Canvas(bitmap);
Paint p = new Paint();
// p.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.XOR));
canvas.drawBitmap(imageBitmap, 0, 0, p); // this line throws error
imageBitmap = bitmap;
}
更令人惊讶的是,当我在onDraw()
中使用同一行canvas.drawBitmap(imageBitmap, 0, 0, p)
时,它没有抛出任何错误。它工作得很好。
堆栈跟踪
2020-01-17 11:20:07.815 21388-21388/com.mayank.picturemagic E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mayank.picturemagic, PID: 21388
java.lang.IllegalArgumentException: Software rendering doesn't support hardware bitmaps
at android.graphics.BaseCanvas.onHwBitmapInSwMode(BaseCanvas.java:550)
at android.graphics.BaseCanvas.throwIfHwBitmapInSwMode(BaseCanvas.java:557)
at android.graphics.BaseCanvas.throwIfCannotDraw(BaseCanvas.java:69)
at android.graphics.BaseCanvas.drawBitmap(BaseCanvas.java:109)
at android.graphics.Canvas.drawBitmap(Canvas.java:1456)
at com.mayank.picturemagic.MainView.cropSelection(MainView.java:434)
at com.mayank.picturemagic.k$6.onClick(k.java:330)
at android.view.View.performClick(View.java:6608)
at android.view.View.performClickInternal(View.java:6585)
at android.view.View.access$3100(View.java:785)
at android.view.View$PerformClick.run(View.java:25921)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
发布于 2020-01-17 18:53:38
最终得到了一个很好的解决方案
imageBitmap = imageBitmap.copy(Bitmap.Config.ARGB_8888, true);
从本质上从位图中删除硬件配置。
为了解决这个问题,早些时候我尝试了imageBitmap = imageBitmap.copy(imageBitmap.getConfig(), true);
,在这种情况下,配置是硬件,它抛出错误硬件位图总是不可变的。
然而,应该有更有效的解决方案,也是问题的一部分- why this works inside onDraw() but not outside remains
https://stackoverflow.com/questions/59781937
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