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refactor: do not change original image aspect ratio and do not up-scale image in BLEND image-diff mode
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Signed-off-by: leo <longshuang@msn.cn>
This commit is contained in:
leo 2025-06-11 10:25:24 +08:00
parent 7c1a894525
commit c3c7d32167
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1 changed files with 22 additions and 12 deletions
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34
src/Views/ImageContainer.cs
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@ -286,7 +286,6 @@ namespace SourceGit.Views
{
base.Render(context);
var rect = new Rect(0, 0, Bounds.Width, Bounds.Height);
var alpha = Alpha;
var left = OldImage;
var right = NewImage;
@ -295,32 +294,27 @@ namespace SourceGit.Views
if (drawLeft && drawRight)
{
using (var rt = new RenderTargetBitmap(right.PixelSize, right.Dpi))
using (var rt = new RenderTargetBitmap(new PixelSize((int)Bounds.Width, (int)Bounds.Height), right.Dpi))
{
var rtRect = new Rect(rt.Size);
using (var dc = rt.CreateDrawingContext())
{
using (dc.PushRenderOptions(RO_SRC))
using (dc.PushOpacity(1 - alpha))
dc.DrawImage(left, rtRect);
RenderSingleSide(dc, left, rt.Size.Width, rt.Size.Height, 1 - alpha);
using (dc.PushRenderOptions(RO_DST))
using (dc.PushOpacity(alpha))
dc.DrawImage(right, rtRect);
RenderSingleSide(dc, right, rt.Size.Width, rt.Size.Height, alpha);
}
context.DrawImage(rt, rtRect, rect);
context.DrawImage(rt, new Rect(0, 0, Bounds.Width, Bounds.Height));
}
}
else if (drawLeft)
{
using (context.PushOpacity(1 - alpha))
context.DrawImage(left, rect);
RenderSingleSide(context, left, Bounds.Width, Bounds.Height, 1 - alpha);
}
else if (drawRight)
{
using (context.PushOpacity(alpha))
context.DrawImage(right, rect);
RenderSingleSide(context, right, Bounds.Width, Bounds.Height, alpha);
}
}
@ -348,6 +342,22 @@ namespace SourceGit.Views
return new Size(scale * img.Width, scale * img.Height);
}
private void RenderSingleSide(DrawingContext context, Bitmap img, double w, double h, double alpha)
{
var imgW = img.Size.Width;
var imgH = img.Size.Height;
var scale = Math.Min(1, Math.Min(w / imgW, h / imgH));
var scaledW = img.Size.Width * scale;
var scaledH = img.Size.Height * scale;
var src = new Rect(0, 0, imgW, imgH);
var dst = new Rect((w - scaledW) * 0.5, (h - scaledH) * 0.5, scaledW, scaledH);
using (context.PushOpacity(alpha))
context.DrawImage(img, src, dst);
}
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 };
}