fill with a pattern

[artbot1]

is it possible to implement a pattern object which could be used for filling of a shape, like in this short demo pdf

`
%PDF-1.3
%ÿÿÿÿ
1 0 obj
<< /Creator
/Producer

endobj
2 0 obj
<< /Type /Catalog
/Pages 3 0 R

endobj
3 0 obj
<< /Type /Pages
/Count 1
/Kids [5 0 R]

endobj
4 0 obj
<< /Length 64

stream
q
/Pattern cs
/SPdummytest123 scn
50.0 200.0 100.0 100.0 re
f
Q

endstream
endobj
5 0 obj
<< /Type /Page
/Parent 3 0 R
/MediaBox [0 0 595.28 841.89]
/CropBox [0 0 595.28 841.89]
/BleedBox [0 0 595.28 841.89]
/TrimBox [0 0 595.28 841.89]
/ArtBox [0 0 595.28 841.89]
/Contents 4 0 R
/Resources << /ProcSet [/PDF /Text /ImageB /ImageC /ImageI]
/Pattern << /SPdummytest123 6 0 R

endobj
6 0 obj
<< /PatternType 1
/PaintType 1
/TilingType 2
/BBox [0 0 20 20]
/XStep 20
/YStep 20
/Matrix [1 0 0 1 0 0]
/Length 22

stream
5.0 5.0 10.0 10.0 re
f
endstream
endobj
xref
0 7
0000000000 65535 f
0000000015 00000 n
0000000109 00000 n
0000000158 00000 n
0000000215 00000 n
0000000329 00000 n
0000000638 00000 n
trailer
<< /Size 7
/Root 2 0 R
/Info 1 0 R

startxref
812
%%EOF
`

could
page.node.newXObject page.node.setXObject
be used to generate the 6 0 obj (which contains the pattern)???

aha

[artbot1]

here is a (js) solution, could be more streamlined, but it works !!!
(adapted from #445)

function createPagePatternAnnotation(page) {
const obj =
page.doc.context.obj({
PatternType: 1,
PaintType: 1,
TilingType: 2,
BBox: [0, 0, 20, 20],
XStep: 20,
YStep: 20,
Matrix: [1, 0, 0, 1, 0, 0]
})

const ops = [
rectangle(5, 5, 10, 10),
setFillingColor( rgb(0, 0, 0.9) ),
fill()
]
const obj_with_stream = PDFContentStream.of(obj, ops);
const ref = page.doc.context.register(obj_with_stream)
return ref
}

const pdfDoc = await PDFDocument.create()
const page = pdfDoc.addPage()

const pattern_ref = createPagePatternAnnotation(page)
const pattern_obj_ref = page.doc.context.obj({
ArtPat: pattern_ref
})

// Add the pattern to the page's resources
// NOTE: This currently overrides existing entries in the /Pattern
// resources dict, if one exists. Should be updated to add onto existing
// patterns instead of overriding, when possible.
const { Resources } = page.node.normalizedEntries();
Resources.set(PDFName.of('Pattern'), pattern_obj_ref)

page.pushOperators(
pushGraphicsState(),
PDFOperator.of(Ops.NonStrokingColorspace, [PDFName.of('Pattern')]),
PDFOperator.of(Ops.NonStrokingColorN, [PDFName.of('ArtPat')]),
rectangle(50, 200, 100, 100),
fillAndStroke(),
popGraphicsState(),
)

const pdfBytes = await pdfDoc.save({useObjectStreams: false, dataUri: false})
//const pdfBytes = await pdfDoc.save()

fs.writeFileSync('main_fill_pattern.pdf', pdfBytes)

BTW: is there a possibility to disable Filter FlateDeflate for streams (with paths). quite difficult to debug
with encoded streams!