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PDF pages physical dimensions should be close to US Letter or A4 (#153)

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This commit is contained in:
Pierre-Yves Nicolas
2026-04-10 18:57:32 +02:00
parent 3e085eca5c
commit eeb0d8e8b3
1 changed files with 19 additions and 2 deletions
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21
app/src/main/java/org/fairscan/app/platform/AndroidPdfWriter.kt
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@@ -34,10 +34,27 @@ class AndroidPdfWriter : PdfWriter {
doc.use { document ->
for (jpegBytes in jpegs) {
val image = JPEGFactory.createFromByteArray(document, jpegBytes.get().bytes)
val page = PDPage(PDRectangle(image.width.toFloat(), image.height.toFloat()))
// Let's say that the physical dimensions of the page are close to US Letter
// US Letter: 215.9×279.4 mm (A4: 210×297 mm)
val maxDimInMm = 279.4f
// PDF has 72 points (units) per inch, 1 inch = 25.4 mm
val pointsPerMm = 72f / 25.4f
val widthPx = image.width.toFloat()
val heightPx = image.height.toFloat()
val maxPx = maxOf(widthPx, heightPx)
val scalePxToMm = maxDimInMm / maxPx
val widthPoints = widthPx * scalePxToMm * pointsPerMm
val heightPoints = heightPx * scalePxToMm * pointsPerMm
val page = PDPage(PDRectangle(widthPoints, heightPoints))
document.addPage(page)
val contentStream = PDPageContentStream(document, page, AppendMode.OVERWRITE, false)
contentStream.drawImage(image, 0f, 0f)
contentStream.drawImage(image, 0f, 0f, widthPoints, heightPoints)
contentStream.close()
}
// TODO So the whole document is in memory before this line...