first page empty with complete page filling rows

[nschneider90]

Description

We are generating a PDF file with multiple QR codes.
The pages are very small, to produce small centered QR codes and a QR code is fitting a whole page (with a margin of 1 in each direction).
In this setup, there always is a blank page generated as first page.

I'd try some combinations of page dimensions, margins and row heights and figured out, that the page height has to be row height + top margin + 21, to prevent generating a first blank page.

In my following example, it is row height 20, top margin 1 + 21. That means the page height has to be 42, but I would like to have it on 22, to get a small page with a centered QR code.

The necessary extra height of 21 is always 21, it does not matter if row/page height is 20/22 or 250/252.

Code Example

func CreateQrCodePdf() ([]byte, error) {
	qrCodes := []string{
		"a",
		"b",
		"c",
	}

	configData := pdfConfig.NewBuilder().
		WithDimensions(22, 22).
		WithMargins(1, 1, 1).
		Build()

	doc := pdf.New(configData)

	content := page.New()

	for _, qrCode := range qrCodes {
		content.Add(
			code.NewQrRow(
				20,
				qrCode,
			),
		)
	}

	doc.AddPages(content)
	pdfFile, err := doc.Generate()
	if err != nil {
		return []byte{}, err
	}

	return pdfFile.GetBytes(), nil
}

[johnfercher]

Could you provide an image of the problem?

[nschneider90]

Sure, here are two pictures.
The first one with the problem (row height 22) and the second one with bigger row height, that there is no empty page at the beginning.

[andoryu-kun]

I have the same issue when I generate DataMatrix.
Is it possible to delete the first page?