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82 lines
3.4 KiB
C#
82 lines
3.4 KiB
C#
using Cairo;
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using Gdk;
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using NAPS2.Images.Bitwise;
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namespace NAPS2.Images.Gtk;
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internal class GtkImageTransformer : AbstractImageTransformer<GtkImage>
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{
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public GtkImageTransformer(ImageContext imageContext) : base(imageContext)
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{
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}
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protected override GtkImage PerformTransform(GtkImage image, RotationTransform transform)
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{
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var format = image.PixelFormat == ImagePixelFormat.ARGB32 ? Format.Argb32 : Format.Rgb24;
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int width = image.Width, height = image.Height;
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float xres = image.HorizontalResolution, yres = image.VerticalResolution;
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if (transform.Angle is > 45.0 and < 135.0 or > 225.0 and < 315.0)
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{
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(width, height) = (height, width);
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(xres, yres) = (yres, xres);
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}
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using var surface = new ImageSurface(format, width, height);
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using var context = new Context(surface);
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context.Fill();
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context.SetSourceColor(new Cairo.Color(1, 1, 1));
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context.Paint();
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context.Translate(width / 2.0, height / 2.0);
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context.Rotate(transform.Angle * Math.PI / 180);
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context.Translate(-image.Width / 2.0, -image.Height / 2.0);
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CairoHelper.SetSourcePixbuf(context, image.Pixbuf, 0, 0);
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context.Paint();
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var newImage = new GtkImage(new Pixbuf(surface, 0, 0, width, height));
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OptimizePixelFormat(image, ref newImage);
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newImage.LogicalPixelFormat = image.LogicalPixelFormat;
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newImage.SetResolution(xres, yres);
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image.Dispose();
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return newImage;
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}
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protected override GtkImage PerformTransform(GtkImage image, ResizeTransform transform)
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{
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// TODO: Can we improve interpolation? Somehow integrate Cairo.Filter.Bilinear or Cairo.Filter.Best, though
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// it's not clear how to reconcile that with SetSourcePixbuf.
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var format = image.PixelFormat == ImagePixelFormat.ARGB32 ? Format.Argb32 : Format.Rgb24;
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using var surface = new ImageSurface(format, transform.Width, transform.Height);
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using var context = new Context(surface);
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context.Scale(transform.Width / (double) image.Width, transform.Height / (double) image.Height);
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CairoHelper.SetSourcePixbuf(context, image.Pixbuf, 0, 0);
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context.Paint();
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var newImage = new GtkImage(new Pixbuf(surface, 0, 0, transform.Width, transform.Height));
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newImage.LogicalPixelFormat = image.LogicalPixelFormat == ImagePixelFormat.BW1
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? ImagePixelFormat.Gray8
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: image.LogicalPixelFormat;
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newImage.SetResolution(
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image.HorizontalResolution * image.Width / transform.Width,
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image.VerticalResolution * image.Height / transform.Height);
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image.Dispose();
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return newImage;
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}
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protected override GtkImage PerformTransform(GtkImage image, BlackWhiteTransform transform)
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{
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new DecolorBitwiseImageOp(true)
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{
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BlackWhiteThreshold = (transform.Threshold + 1000) / 2000f
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}.Perform(image);
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image.LogicalPixelFormat = ImagePixelFormat.BW1;
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return image;
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}
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protected override GtkImage PerformTransform(GtkImage image, GrayscaleTransform transform)
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{
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new DecolorBitwiseImageOp(false).Perform(image);
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if (image.LogicalPixelFormat != ImagePixelFormat.Unknown)
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{
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image.LogicalPixelFormat = ImagePixelFormat.Gray8;
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}
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return image;
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}
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} |