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use printpdf::*; |
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use std::path::Path; |
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pub fn imageToPdf(path: String) -> Result<String, String> { |
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let mut doc = PdfDocument::new("image_to_pdf"); |
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let image_bytes = std::fs::read(&path).map_err(|e| e.to_string())?; |
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let image = RawImage::decode_from_bytes(&image_bytes, &mut Vec::new()).unwrap(); |
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let mut ops = Vec::new(); |
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// In the PDF, an image is an `XObject`, identified by a unique `ImageId`
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let image_xobject_id = doc.add_image(&image); |
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// Calculate image size in points (1 point = 1/72 inch)
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// let dpi = 300.0;
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// let output_width= 105.0; // A6 width in mm
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// let output_height = 148.0; // A6 height in mm
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// let mm_to_pt = 1.0 / 25.4; // Conversion factor
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// let width_pt = output_width * mm_to_pt * dpi / image.width as f64;
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// let height_pt = output_height * mm_to_pt * dpi / image.height as f64;
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// println!("Image size in points: {}x{}", width_pt, height_pt);
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// Place the image at (0,0) with the calculated size
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ops.push(Op::UseXobject { |
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id: image_xobject_id.clone(), |
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transform: XObjectTransform { |
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translate_x: Some(Pt(0.0)), |
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translate_y: Some(Pt(0.0)), |
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scale_x: Some(1.0), |
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scale_y: Some(1.0), |
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dpi: Some(300.0), |
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..Default::default() |
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}, |
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}); |
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let page1 = PdfPage::new(Mm(105.0), Mm(148.0), ops); |
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let pdf_bytes: Vec<u8> = doc |
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.with_pages(vec![page1]) |
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.save(&PdfSaveOptions::default(), &mut Vec::new()); |
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let pdf_path = Path::new(&path).with_extension("pdf"); |
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match std::fs::write(&pdf_path, pdf_bytes) { |
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Ok(_) => { |
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let abs_path = std::fs::canonicalize(&pdf_path) |
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.map(|p| p.display().to_string()) |
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.unwrap_or_else(|_| pdf_path.display().to_string()); |
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println!("PDF written successfully to {}", abs_path); |
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Ok(abs_path) |
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}, |
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Err(e) => Err(format!("Failed to write PDF: {}", e)), |
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} |
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} |
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