// crop
public SoftwareBitmap Crop(SoftwareBitmap softwareBitmap, Rect bounds)
{
if (softwareBitmap.BitmapPixelFormat != BitmapPixelFormat.Bgra8)
{
softwareBitmap = SoftwareBitmap.Convert(softwareBitmap, BitmapPixelFormat.Bgra8);
}
var resourceCreator = CanvasDevice.GetSharedDevice();
using (var canvasBitmap = CanvasBitmap.CreateFromSoftwareBitmap(resourceCreator, softwareBitmap))
using (var canvasRenderTarget = new CanvasRenderTarget(resourceCreator, (float)bounds.Width, (float)bounds.Width, canvasBitmap.Dpi))
using (var drawingSession = canvasRenderTarget.CreateDrawingSession())
using (var cropEffect = new CropEffect())
using (var atlasEffect = new AtlasEffect())
{
drawingSession.Clear(Colors.White);
cropEffect.SourceRectangle = bounds;
cropEffect.Source = canvasBitmap;
atlasEffect.SourceRectangle = bounds;
atlasEffect.Source = cropEffect;
drawingSession.DrawImage(atlasEffect);
drawingSession.Flush();
return(SoftwareBitmap.CreateCopyFromBuffer(canvasRenderTarget.GetPixelBytes().AsBuffer(), BitmapPixelFormat.Bgra8, (int)bounds.Width, (int)bounds.Width, BitmapAlphaMode.Premultiplied));
}
}
public static SoftwareBitmap CropAndResize(this SoftwareBitmap softwareBitmap, Rect bounds, float newWidth, float newHeight)
{
var resourceCreator = CanvasDevice.GetSharedDevice();
using (var canvasBitmap = CanvasBitmap.CreateFromSoftwareBitmap(resourceCreator, softwareBitmap))
using (var canvasRenderTarget = new CanvasRenderTarget(resourceCreator, newWidth, newHeight, canvasBitmap.Dpi))
using (var drawingSession = canvasRenderTarget.CreateDrawingSession())
using (var scaleEffect = new ScaleEffect())
using (var cropEffect = new CropEffect())
using (var atlasEffect = new AtlasEffect())
{
drawingSession.Clear(Colors.White);
cropEffect.SourceRectangle = bounds;
cropEffect.Source = canvasBitmap;
atlasEffect.SourceRectangle = bounds;
atlasEffect.Source = cropEffect;
scaleEffect.Source = atlasEffect;
scaleEffect.Scale = new System.Numerics.Vector2(newWidth / (float)bounds.Width, newHeight / (float)bounds.Height);
drawingSession.DrawImage(scaleEffect);
drawingSession.Flush();
return(SoftwareBitmap.CreateCopyFromBuffer(canvasRenderTarget.GetPixelBytes().AsBuffer(), BitmapPixelFormat.Bgra8, (int)newWidth, (int)newHeight, BitmapAlphaMode.Premultiplied));
}
}
