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Clean up imagemagick disposal processing

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This commit is contained in:
Kovid Goyal
2025-11-07 14:44:26 +05:30
parent f8c78909fa
commit 375aeae689
1 changed files with 10 additions and 6 deletions
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16
tools/utils/images/loading.go
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@@ -420,9 +420,7 @@ func parse_identify_record(ans *IdentifyRecord, raw *IdentifyOutput) (err error)
}
ans.Needs_blend = q == "blend"
switch strings.ToLower(raw.Dispose) {
case "undefined":
ans.Disposal = 0
case "none":
case "none", "undefined":
ans.Disposal = gif.DisposalNone
case "background":
ans.Disposal = gif.DisposalBackground
@@ -626,10 +624,16 @@ func RenderWithMagick(path, original_file_path string, ro *RenderOptions, frames
return
}
slices.SortFunc(ans, func(a, b *ImageFrame) int { return a.Number - b.Number })
anchor_frame := uint(1)
prev_disposal := gif.DisposalBackground
prev_compose_onto := 0
for i, frame := range ans {
af, co := gifmeta.SetGIFFrameDisposal(uint(frame.Number), anchor_frame, byte(frames[i].Disposal))
anchor_frame, frame.Compose_onto = af, int(co)
switch prev_disposal {
case gif.DisposalNone:
frame.Compose_onto = frame.Number - 1
case gif.DisposalPrevious:
frame.Compose_onto = prev_compose_onto
}
prev_disposal, prev_compose_onto = frames[i].Disposal, frame.Compose_onto
}
return
}