TextureView TranslationX&Y在API 23上没有预期的行为

Phi*_*ens 5 android translation xamarin textureview

目前我正在使用相机播放器textureview来渲染我的相机.因为预览可以有任何维度,所以我创建了一些自定义代码来在调用时改变textureview OnSurfaceTextureUpdated:

    void updateTextureMatrix(int width, int height) {
        Display display = WindowManager.DefaultDisplay;
        var isPortrait = (display.Rotation == SurfaceOrientation.Rotation0 || display.Rotation == SurfaceOrientation.Rotation180);

        int previewWidth = orgPreviewWidth;
        int previewHeight = orgPreviewHeight;

        if(isPortrait) {
            previewWidth = orgPreviewHeight;
            previewHeight = orgPreviewWidth;
        }

        // determine which part to crop
        float widthRatio = (float)width / previewWidth;
        float heightRatio = (float)height / previewHeight;

        float scaleX;
        float scaleY;

        if(widthRatio > heightRatio) {
            // height must be cropped
            scaleX = 1;
            scaleY = widthRatio * ((float)previewHeight / height);
        } else {
            // width must be cropped
            scaleX = heightRatio * ((float)previewWidth / width);
            scaleY = 1; 
        }

        Android.Graphics.Matrix matrix = new Android.Graphics.Matrix();

        matrix.SetScale(scaleX, scaleY);
        _textureView.SetTransform(matrix);

        float scaledWidth = width * scaleX;
        float scaledHeight = height * scaleY;

        float dx = (width - scaledWidth) * 0.5f;
        float dy = (height - scaledHeight) * 0.5f;
        _textureView.TranslationX = dx;
        _textureView.TranslationY = dy;
    }
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在旧版Android设备上进行缩放和计算dxdy完美运行,但我使用API​​级别23处理的设备会引发意外行为.

Galaxy S3正确显示: Galaxy S3

但是在S7上: S7

尽管正确定位,手机仍能切断大量图像.这让我相信底部部分不会在旧设备上呈现.任何人都可以证实这一点并指出我正确的位置来解决这个问题吗?

Phi*_*ens 4

经过长时间的测试,我发现问题是由于SetTransform方法造成的。我正在使用矩阵设置比例,但这以某种方式渲染了我的纹理并忽略了TranslationX& TranslationY。删除矩阵并用 floatscaledWidth = width *scaleX 替换它;浮动缩放高度=高度*缩放Y;

        float dx = (width - scaledWidth) * 0.5f;
        float dy = (height - scaledHeight) * 0.5f;
        _textureView.ScaleX = scaleX;
        _textureView.ScaleY = scaleY;
        _textureView.TranslationX = dx;
        _textureView.TranslationY = dy;
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修复了在某些 Android 设备上渲染错误的问题。