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58382e9572
When doing something like this with the same image from a partial used in, say, both the home page and the single page:
```bash
{{ with $img }}
{{ $big := .Fill "1024x512 top" }}
{{ $small := $big.Resize "512x" }}
{{ end }}
```
There would be timing issues making Hugo in some cases try to process the same image with the same instructions in parallel.
You would experience errors of type:
```bash
png: invalid format: not enough pixel data
```
This commit works around that by adding a mutex per image. This should also improve the performance, sligthly, as it avoids duplicate work.
The current workaround before this fix is to always operate on the original:
```bash
{{ with $img }}
{{ $big := .Fill "1024x512 top" }}
{{ $small := .Fill "512x256 top" }}
{{ end }}
```
Fixes #4404
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| .. | ||
| testdata | ||
| image.go | ||
| image_cache.go | ||
| image_test.go | ||
| resource.go | ||
| resource_test.go | ||
| smartcrop.go | ||
| testhelpers_test.go | ||