尝试缩放时出现 ArrayIndexOutOfBoundsException

Question

一直在尝试将视图缩小到不同的比例，但我遇到了一些麻烦。上下文在视频播放器中（使用 VLCJ）。

此代码用于缩放图像，但在第一帧之后图像出于某种原因停止更新为下一图像。

public void newFrameRecieved(int[] rgbBuffer)
{
    this.image.setRGB(0, 0, this.size.width, this.size.height, rgbBuffer, 0, this.size.width);


    after = new BufferedImage(this.getWidth(), this.getHeight(), this.image.getType());
    at = new AffineTransform();
    scalingFactorX = (double)this.getWidth()/ (double)this.image.getWidth();
    scalingFactorY = (double)this.getHeight()/ (double)this.image.getHeight();
    at.scale(scalingFactorX, scalingFactorY);
    scaleOp = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
    this.image = scaleOp.filter(this.image, after);


    repaint();
}

如果删除中间部分（this.image.setRGB(......) 和 repaint(); 之间的所有代码）则它可以工作（缩放部分除外......）

非常感谢你们提供的任何帮助！收到的错误如下：

JNA: Callback uk.co.caprica.vlcj.player.direct.DefaultDirectMediaPlayer$DisplayCallback@4516af24 threw the following exception:
java.lang.ArrayIndexOutOfBoundsException: Coordinate out of bounds!
    at sun.awt.image.IntegerInterleavedRaster.setDataElements(IntegerInterleavedRaster.java:301)
    at java.awt.image.BufferedImage.setRGB(BufferedImage.java:1059)
    at myVlcjWrapper.VideoSurfacePanel.newFrameRecieved(VideoSurfacePanel.java:65)

我明白这个问题我只是不知道如何解决它！谢谢！

Answer 1

经过大量错误搜索后，我得到了这段有效代码！

public void newFrameRecieved(int[] rgbBuffer, Dimension max)
{
    before = new BufferedImage(max.width, max.height, BufferedImage.TYPE_INT_ARGB);
    before.setRGB(0, 0, max.width, max.height, rgbBuffer, 0, max.width);
    after = new BufferedImage(this.getWidth(), this.getHeight(), this.image.getType());
    at = new AffineTransform();
    scalingFactorX = (double)after.getWidth()/ (double)before.getWidth();
    scalingFactorY = (double)after.getHeight()/ (double)before.getHeight();
    at.scale(scalingFactorX, scalingFactorY);
    scaleOp = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
    this.image = scaleOp.filter(before, after);

    repaint();
}

这是一个微小的变化，但它起到了作用！认为最好 post 它以防万一有人再次找到这里。感谢您的帮助！ :)

尝试缩放时出现 ArrayIndexOutOfBoundsException

ArrayIndexOutOfBoundsException while trying to scale

java

bufferedimage

scale

libvlc

vlcj