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Wpf: Rotations at any angle

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This commit is contained in:
Ben Olden-Cooligan 2023-12-25 07:46:44 -08:00
parent ee4db52303
commit 35a8dd3810
1 changed files with 15 additions and 6 deletions
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21
NAPS2.Images.Wpf/WpfImageTransformer.cs
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@ -1,3 +1,4 @@
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
@ -11,9 +12,6 @@ public class WpfImageTransformer : AbstractImageTransformer<WpfImage>
protected override WpfImage PerformTransform(WpfImage image, RotationTransform transform)
{
// TODO: We can maybe optimize this in some ways, e.g. skip a clone if we're already Rgba32, or convert the
// final pixel format back to whatever the original was.
var width = image.Width;
var height = image.Height;
float xres = image.HorizontalResolution, yres = image.VerticalResolution;
@ -23,10 +21,21 @@ public class WpfImageTransformer : AbstractImageTransformer<WpfImage>
(xres, yres) = (yres, xres);
}
var copy = new TransformedBitmap(image.Bitmap, new RotateTransform(transform.Angle));
var visual = new DrawingVisual();
using (var dc = visual.RenderOpen())
{
dc.DrawRectangle(Brushes.White, null, new Rect(0, 0, width, height));
dc.PushTransform(new TranslateTransform(width / 2.0, height / 2.0));
dc.PushTransform(new RotateTransform(transform.Angle));
dc.PushTransform(new TranslateTransform(-image.Width / 2.0, -image.Height / 2.0));
dc.DrawImage(image.Bitmap, new Rect(0, 0, image.Width, image.Height));
}
var newImage = new WpfImage(ImageContext, new WriteableBitmap(copy));
// TODO: In Gdi, we convert this back to BW1. Should we do the same?
var rtb = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Default);
rtb.Render(visual);
var newImage = new WpfImage(ImageContext, new WriteableBitmap(rtb));
// TODO: In Gdi, we convert this back to BW1 (or the original pixel format). Should we do the same?
newImage.LogicalPixelFormat = image.LogicalPixelFormat == ImagePixelFormat.BW1
? ImagePixelFormat.Gray8
: image.LogicalPixelFormat;