public swmi.BitmapFrame Get(swmi.BitmapSource image, float scale, int width, int height, swm.BitmapScalingMode scalingMode)
{
if (width <= 0 || height <= 0 || scale <= 0)
{
return(null);
}
var _cachedFrame = _cachedFrameReference?.Target as swmi.BitmapFrame;
// if parameters are the same, return cached bitmap
if (_cachedFrame != null && scale == _scale && width == _width && height == _height && scalingMode == _scalingMode)
{
return(_cachedFrame);
}
// generate a new bitmap with the desired size & scale.
var scaledwidth = (int)Math.Round(width * scale);
var scaledheight = (int)Math.Round(height * scale);
if (scaledwidth <= 0 || scaledheight <= 0)
{
return(null);
}
var group = new swm.DrawingGroup();
swm.RenderOptions.SetBitmapScalingMode(group, scalingMode);
group.Children.Add(new swm.ImageDrawing(image, new sw.Rect(0, 0, width, height)));
var targetVisual = new swm.DrawingVisual();
using (var targetContext = targetVisual.RenderOpen())
targetContext.DrawDrawing(group);
// note, this uses a GDI handle, which are limited (only 5000 or so can be created).
// There's no way to get around it other than just not creating that many and using GC.Collect/WaitForPendingFinalizers.
// we can't do it in Eto as it'd be a serious performance hit.
var target = new swmi.RenderTargetBitmap(scaledwidth, scaledheight, 96 * scale, 96 * scale, swm.PixelFormats.Default);
target.Render(targetVisual);
target.Freeze();
_cachedFrame = swmi.BitmapFrame.Create(target);
_cachedFrame.Freeze();
_scale = scale;
_width = width;
_height = height;
_scalingMode = scalingMode;
_cachedFrameReference = new WeakReference(_cachedFrame);
return(_cachedFrame);
}
/// <summary>
/// Resizes a bitmap frame
/// </summary>
/// <param name="photo"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="scalingMode"></param>
/// <returns></returns>
public static BitmapFrame Resize(BitmapFrame photo, int width, int height, System.Windows.Media.BitmapScalingMode scalingMode)
{
var group = new System.Windows.Media.DrawingGroup();
System.Windows.Media.RenderOptions.SetBitmapScalingMode(group, scalingMode);
group.Children.Add(new System.Windows.Media.ImageDrawing(photo, new System.Windows.Rect(0, 0, width, height)));
var targetVisual = new System.Windows.Media.DrawingVisual();
var targetContext = targetVisual.RenderOpen();
targetContext.DrawDrawing(group);
var target = new RenderTargetBitmap(width, height, 96, 96, System.Windows.Media.PixelFormats.Default);
targetContext.Close();
target.Render(targetVisual);
var targetFrame = BitmapFrame.Create(target);
return(targetFrame);
}
public static ImageInterpolation ToEto(this swm.BitmapScalingMode value)
{
switch (value)
{
case swm.BitmapScalingMode.HighQuality:
return(ImageInterpolation.High);
case swm.BitmapScalingMode.LowQuality:
return(ImageInterpolation.Low);
case swm.BitmapScalingMode.NearestNeighbor:
return(ImageInterpolation.None);
case swm.BitmapScalingMode.Unspecified:
return(ImageInterpolation.Default);
default:
throw new NotSupportedException();
}
}
static swmi.BitmapFrame Resize(swmi.BitmapSource image, float scale, int width, int height, swm.BitmapScalingMode scalingMode)
{
var group = new swm.DrawingGroup();
swm.RenderOptions.SetBitmapScalingMode(group, scalingMode);
group.Children.Add(new swm.ImageDrawing(image, new sw.Rect(0, 0, width, height)));
var targetVisual = new swm.DrawingVisual();
var targetContext = targetVisual.RenderOpen();
targetContext.DrawDrawing(group);
width = (int)Math.Round(width * scale);
height = (int)Math.Round(height * scale);
var target = new swmi.RenderTargetBitmap(width, height, 96 * scale, 96 * scale, swm.PixelFormats.Default);
targetContext.Close();
target.Render(targetVisual);
return(swmi.BitmapFrame.Create(target));
}
public Column()
{
ScalingMode = swm.BitmapScalingMode.HighQuality;
}
