SkiaSharp 从 ImageView 加载图像

Question

我正在尝试将位图从 ImageView 加载到 SKCanvasView。问题是这张图片设置了 CenterCrop 并且加载到 canvas 的图片太大了。如何让它看起来和ImageView一模一样？

代码示例：

_skBitmap = ((BitmapDrawable)_frontView.ImageView.Drawable).Bitmap.ToSKBitmap();

并绘图：

private void _canvas_PaintSurface(object sender, SKPaintSurfaceEventArgs e)
    {
        var canvas = e.Surface.Canvas;

        var scale = Resources.DisplayMetrics.Density;

        canvas.Scale(scale);

        if (_skBitmap != null)
        {
            canvas.DrawBitmap(_skBitmap, e.Info.Rect);
        }
    }

Answer 1

如果有人感兴趣（在我的例子中图像总是比屏幕宽）：

private void _canvas_PaintSurface(object sender, SKPaintSurfaceEventArgs e)
{
    var canvas = e.Surface.Canvas;

    var scale = Resources.DisplayMetrics.Density;

    canvas.Scale(scale);

    if (_skBitmap != null)
        {
            var factor = scaledSize.Height / _skBitmap.Height;
            var nw = _skBitmap.Width * factor;
            var offset = (scaledSize.Width - nw) / 2;

            var sr = new SKRect(offset, 0, nw + offset, scaledSize.Height);
            canvas.DrawBitmap(_skBitmap, sr);
        }
}

SkiaSharp 从 ImageView 加载图像

SkiaSharp load imge from ImageView

android

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