Memory leak with images creation

[Athin0]

When I load tested this code, memory usage kept growing and wasn't freed.

func MakeImageFirstPage(file []byte, DPI float64) (image.Image, error) {
	doc, err := fitz.NewFromMemory(file)
	if err != nil {
		return nil, fmt.Errorf("%w: %w", ErrInvalidFile, err)
	}
	defer doc.Close()
	img, err := doc.ImageDPI(0, DPI)
	if err != nil {
		return nil, fmt.Errorf("%w: %w", ErrImageCreation, err)
	}
	return img, nil
}

I really need your help because I'm so bad at CGO.

[Athin0]

New additional information:

• When I run only fitz.NewFromMemory(...), memory remains stable.
• When I increase the DPI (e.g. from 50 to 200), the memory usage grows faster and does not clear.

It looks like something inside ImageDPI or the underlying C resources might not be fully released.

Maybe I need to do something manually to free the memory after calling ImageDPI?

Thanks in advance for any help or suggestions.

[pmilanez]

I've had the SAME problem with ImagePNG(0, 300.0)

[kj686]

hi @Athin0, were you able to solve the issue? I notice there is a similar issue in PyMuPDF and they provide a solution to set pix as None. pymupdf/PyMuPDF#1430.