fix: scale signature images to fill signature fields

The field renderer decreased large signature images to the field size, but it did not increase small images. Thus a low-resolution image, for example an upload from a different tool, showed at its native pixel size and was too small. This change removes the cap on the scale factor in the Konva field renderer and in the v1 and legacy PDF insert paths. The image scales in the two directions to fill the field, and the aspect ratio stays the same.
2026-08-15 02:53:32 +10:00 · 2026-08-11 15:37:40 +00:00
3 changed files with 3 additions and 3 deletions
@@ -135,7 +135,7 @@ export const insertFieldInPDFV1 = async (pdf: PDFDocument, field: FieldWithSigna
          let imageWidth = image.width;
          let imageHeight = image.height;

-          const scalingFactor = Math.min(fieldWidth / imageWidth, fieldHeight / imageHeight, 1);
+          const scalingFactor = Math.min(fieldWidth / imageWidth, fieldHeight / imageHeight);

          imageWidth = imageWidth * scalingFactor;
          imageHeight = imageHeight * scalingFactor;
@@ -128,7 +128,7 @@ export const legacy_insertFieldInPDF = async (pdf: PDFDocument, field: FieldWith
          let imageWidth = image.width;
          let imageHeight = image.height;

-          const scalingFactor = Math.min(fieldWidth / imageWidth, fieldHeight / imageHeight, 1);
+          const scalingFactor = Math.min(fieldWidth / imageWidth, fieldHeight / imageHeight);

          imageWidth = imageWidth * scalingFactor;
          imageHeight = imageHeight * scalingFactor;
@@ -23,7 +23,7 @@ const getImageDimensions = (img: HTMLImageElement, fieldWidth: number, fieldHeig
  let imageWidth = img.width;
  let imageHeight = img.height;

-  const scalingFactor = Math.min(fieldWidth / imageWidth, fieldHeight / imageHeight, 1);
+  const scalingFactor = Math.min(fieldWidth / imageWidth, fieldHeight / imageHeight);

  imageWidth = imageWidth * scalingFactor;
  imageHeight = imageHeight * scalingFactor;