怎样有效地修改从相机捕获字节？ [英] How do I efficiently modify captured bytes from the camera?

问题描述

我画从摄像机的图像上的重叠，并保存结果到文件。要做到这一点，我传递一个包含code下面takePicture（）回调。对于较大的图像大小，我越来越崩溃，在方法的第一行OutOfMemoryError异常。

有没有什么办法可以更有效地做到这一点？看来，它不可能使从字节[]，这立即双打我的内存使用量的可变位图。如果它不能在高分辨率的情况做这样子，怎么的可以的我产生大量拍摄的图像上叠加而不会耗尽内存？

 公共无效onPictureTaken（字节[] rawPlainImage，相机摄像头）{
    位图plainImage = BitmapFactory.de codeByteArray的（rawPlainImage，0，rawPlainImage.length）;
    plainImage = plainImage.copy（plainImage.getConfig（），TRUE）;
    帆布combinedImage =新的Canvas（pl​​ainImage）;
    combinedImage.drawBitmap（mOverlay，mOverlayTransformation，NULL）;
    //写plainImage（今修改）到一个文件
    plainImage.recycle（）;
}
 

解决方案

您实际上并不需要取消code中的形象。相反，绘制overlay的画布，画布保存为位图，该位图转换为字节数组，然后结合画布的字节数组和位图，然后保存。

I'm drawing an overlay on an image from the camera and saving the result to a file. To do this, I am passing a callback containing the code below to takePicture(). With larger image sizes, I am getting crashes with an OutOfMemoryError at the first line of the method.

Is there any way I can do this more efficiently? It seems that it's not possible to make a mutable Bitmap from the byte[], which doubles my memory usage immediately. If it can't be done this way at high resolutions, how can I produce an overlay on a large captured image without running out of memory?

public void onPictureTaken(byte[] rawPlainImage, Camera camera) {
    Bitmap plainImage = BitmapFactory.decodeByteArray(rawPlainImage, 0, rawPlainImage.length);
    plainImage = plainImage.copy(plainImage.getConfig(), true);
    Canvas combinedImage = new Canvas(plainImage);
    combinedImage.drawBitmap(mOverlay, mOverlayTransformation, null);
    //Write plainImage (now modified) out to a file
    plainImage.recycle();
}

解决方案

You don't actually need to decode the image. Instead draw the overlay to the canvas, save the canvas as a bitmap, convert that bitmap to a byte array and then combine the byte array of the canvas and the bitmap and then save that.

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