From b532eeff23dbd605b8df86e23c074f1ec1ba53d1 Mon Sep 17 00:00:00 2001
From: ruven <ruven@users.sourceforge.net>
Date: Mon, 11 Sep 2023 16:00:42 +0200
Subject: [PATCH] Added extra check for untiled TIFF images

---
 ChangeLog       | 3 +++
 src/TPTImage.cc | 8 +++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index c4949b6d..86ae5006 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+11/09/2023:
+	- Added extra check for untiled TIFF images
+
 
 07/09/2023:
 	- Fix normalization in convolution when kernel sums to zero
diff --git a/src/TPTImage.cc b/src/TPTImage.cc
index 20ba7000..e9bf1bbd 100644
--- a/src/TPTImage.cc
+++ b/src/TPTImage.cc
@@ -103,9 +103,7 @@ void TPTImage::loadImageInfo( int seq, int ang )
   currentX = seq;
   currentY = ang;
 
-  // Get the tile and image sizes
-  TIFFGetField( tiff, TIFFTAG_TILEWIDTH, &tw );
-  TIFFGetField( tiff, TIFFTAG_TILELENGTH, &th );
+  // Get various essential image parameters
   TIFFGetField( tiff, TIFFTAG_IMAGEWIDTH, &w );
   TIFFGetField( tiff, TIFFTAG_IMAGELENGTH, &h );
   TIFFGetField( tiff, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel );
@@ -116,6 +114,10 @@ void TPTImage::loadImageInfo( int seq, int ang )
   TIFFGetField( tiff, TIFFTAG_YRESOLUTION, &dpi_y );
   TIFFGetField( tiff, TIFFTAG_RESOLUTIONUNIT, &dpi_units );
 
+  // If image is untiled, set tile sizes to zero
+  if( TIFFGetField( tiff, TIFFTAG_TILEWIDTH, &tw ) == 0 ) tw = 0;
+  if( TIFFGetField( tiff, TIFFTAG_TILEWIDTH, &th ) == 0 ) th = 0;
+
   // Units for libtiff are 1=unknown, 2=DPI and 3=pixels/cm, whereas we want 0=unknown, 1=DPI and 2=pixels/cm
   dpi_units--;