The animated foreground only draws its root frame onto the background

[Yushu2606]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

ImageSharp version

3.1.1

Other ImageSharp packages and versions

SixLabors.ImageSharp.Drawing 2.1.7

Environment (Operating system, version and so on)

Windows 10 22H2

.NET Framework version

.NET 8.0.21

Description

The animated foreground only draws its root frame onto the background.

Steps to Reproduce

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

Image img = await Image.LoadAsync("input.gif");
Point loc = new(128, 128);
img.Mutate(ctx =>
{
    ctx.DrawImage(img, loc, 1);
});
await img.SaveAsGifAsync(
#if DEBUG
    "output_debug.gif"
#elif RELEASE
    "output_release.gif"
#endif
);

Images

input	output (DEBUG)	output (RELEASE)

[JimBobSquarePants]

That's by design.

The method takes the first frame of the source image and draws it on each frame of the target image.

In addition, you do not express what your intended behavior should be nor in your PR how this fixes the "issue".

As I said previously, you need to use the discussions channel to discuss feature requests. Issues are reserved for defects. I'm happy to accept new behavior but I need to clarify requirements and viability of any solution through discussion.

[Yushu2606]

That's by design.

The method takes the first frame of the source image and draws it on each frame of the target image.

In addition, you do not express what your intended behavior should be nor in your PR how this fixes the "issue".

As I said previously, you need to use the discussions channel to discuss feature requests. Issues are reserved for defects. I'm happy to accept new behavior but I need to clarify requirements and viability of any solution through discussion.

sorry for that. I have opened a discussion #2997 for this request now.