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enhance: new image alpha blend implementation

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leo 2024-06-22 11:25:19 +08:00
parent 7a5279f717
commit 209f51da9e
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2 changed files with 59 additions and 39 deletions
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65
src/Views/ImageDiffView.axaml.cs
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@ -9,10 +9,8 @@ using Avalonia.Styling;
namespace SourceGit.Views
{
public class ImageContainer : ContentControl
public class ImageContainer : Control
{
protected override Type StyleKeyOverride => typeof(ContentControl);
public override void Render(DrawingContext context)
{
if (_bgBrush == null)
@ -54,7 +52,7 @@ namespace SourceGit.Views
private DrawingBrush _bgBrush = null;
}
public class ImagesSwipeControl : Control
public class ImagesSwipeControl : ImageContainer
{
public static readonly StyledProperty<double> AlphaProperty =
AvaloniaProperty.Register<ImagesSwipeControl, double>(nameof(Alpha), 0.5);
@ -91,6 +89,8 @@ namespace SourceGit.Views
public override void Render(DrawingContext context)
{
base.Render(context);
var alpha = Alpha;
var w = Bounds.Width;
var h = Bounds.Height;
@ -199,7 +199,7 @@ namespace SourceGit.Views
private bool _lastInSlider = false;
}
public class ImageBlendControl : Control
public class ImageBlendControl : ImageContainer
{
public static readonly StyledProperty<double> AlphaProperty =
AvaloniaProperty.Register<ImageBlendControl, double>(nameof(Alpha), 1.0);
@ -236,30 +236,50 @@ namespace SourceGit.Views
public override void Render(DrawingContext context)
{
base.Render(context);
var rect = new Rect(0, 0, Bounds.Width, Bounds.Height);
var alpha = Alpha;
var left = OldImage;
var right = NewImage;
var drawLeft = left != null && alpha < 1.0;
var drawRight = right != null && alpha > 0;
if (drawLeft)
{
using (context.PushRenderOptions(new RenderOptions() { BitmapBlendingMode = BitmapBlendingMode.Source }))
using (context.PushOpacity(1 - alpha))
context.DrawImage(left, rect);
var psize = left == null ? right.PixelSize : left.PixelSize;
var dpi = left == null ? right.Dpi : left.Dpi;
if (drawRight)
{
using (context.PushRenderOptions(new RenderOptions() { BitmapBlendingMode = BitmapBlendingMode.Plus }))
using (context.PushOpacity(alpha))
context.DrawImage(right, rect);
}
}
else if (drawRight)
using (var rt = new RenderTargetBitmap(psize, dpi))
{
using (context.PushOpacity(alpha))
context.DrawImage(right, rect);
var rtRect = new Rect(rt.Size);
using (var dc = rt.CreateDrawingContext())
{
if (drawLeft)
{
if (drawRight)
{
using (dc.PushRenderOptions(RO_SRC))
using (dc.PushOpacity(1 - alpha))
dc.DrawImage(left, rtRect);
using (dc.PushRenderOptions(RO_DST))
using (dc.PushOpacity(alpha))
dc.DrawImage(right, rtRect);
}
else
{
using (dc.PushRenderOptions(RO_SRC))
using (dc.PushOpacity(1 - alpha))
dc.DrawImage(left, rtRect);
}
}
else if (drawRight)
{
using (dc.PushRenderOptions(RO_SRC))
using (dc.PushOpacity(alpha))
dc.DrawImage(right, rtRect);
}
}
context.DrawImage(rt, rtRect, rect);
}
}
@ -290,6 +310,9 @@ namespace SourceGit.Views
return new Size(scale * img.Width, scale * img.Height);
}
private static readonly RenderOptions RO_SRC = new RenderOptions() { BitmapBlendingMode = BitmapBlendingMode.Source, BitmapInterpolationMode = BitmapInterpolationMode.HighQuality };
private static readonly RenderOptions RO_DST = new RenderOptions() { BitmapBlendingMode = BitmapBlendingMode.Plus, BitmapInterpolationMode = BitmapInterpolationMode.HighQuality };
}
public partial class ImageDiffView : UserControl