[gimp] plug-ins: improve formatting and comments related to resolution export ...

[Jacob Boerema <jboerema src gnome org>]

commit fac6b2f3f1d8251ff7b0d99736c5b06f86ce1fa6
Author: Jacob Boerema <jgboerema gmail com>
Date:   Wed Aug 24 14:19:30 2022 -0400

    plug-ins: improve formatting and comments related to resolution export ...
    
    for PSD's

 plug-ins/file-psd/psd-save.c | 10 +++++-----
 plug-ins/file-psd/psd.h      |  6 +++---
 2 files changed, 8 insertions(+), 8 deletions(-)
---
diff --git a/plug-ins/file-psd/psd-save.c b/plug-ins/file-psd/psd-save.c
index 99ae48ca17..ef70c9483a 100644
--- a/plug-ins/file-psd/psd-save.c
+++ b/plug-ins/file-psd/psd-save.c
@@ -824,10 +824,10 @@ save_resources (GOutputStream  *output,
 
   /* --------------- Write resolution data ------------------- */
   {
-    gdouble xres = 0, yres = 0;
-    guint32 xres_fix, yres_fix;
+    gdouble  xres = 0, yres = 0;
+    guint32  xres_fix, yres_fix;
     GimpUnit g_unit;
-    gint16 psd_unit;
+    gint16   psd_unit;
 
     g_unit = gimp_image_get_unit (image);
     gimp_image_get_resolution (image, &xres, &yres);
@@ -850,10 +850,10 @@ save_resources (GOutputStream  *output,
     write_gint16(output, 0x03ed, "0x03ed Id (resolution)"); /* 1005 */
     write_gint16 (output, 0, "Id name"); /* Set to null string (two zeros) */
     write_gint32 (output, 16, "0x0400 resource size");
-    write_gint32 (output,  xres_fix, "hRes (16.16 fixed point)");
+    write_gint32 (output, xres_fix, "hRes (16.16 fixed point)");
     write_gint16 (output, psd_unit, "hRes unit");
     write_gint16 (output, psd_unit, "width unit");
-    write_gint32 (output,  yres_fix, "vRes (16.16 fixed point)");
+    write_gint32 (output, yres_fix, "vRes (16.16 fixed point)");
     write_gint16 (output, psd_unit, "vRes unit");
     write_gint16 (output, psd_unit, "height unit");
   }
diff --git a/plug-ins/file-psd/psd.h b/plug-ins/file-psd/psd.h
index cd86019bf1..1236faa4b6 100644
--- a/plug-ins/file-psd/psd.h
+++ b/plug-ins/file-psd/psd.h
@@ -435,11 +435,11 @@ typedef struct
 /* Image resolution data */
 typedef struct {
   Fixed         hRes;                   /* Horizontal resolution pixels/inch */
-  gint16        hResUnit;               /* Horizontal display resolution unit */
-  gint16        widthUnit;              /* Width unit ?? */
+  gint16        hResUnit;               /* Horizontal display resolution unit (1=pixels per inch, 2=pixels 
per cm) */
+  gint16        widthUnit;              /* Display width unit (1=inches; 2=cm; 3=points; 4=picas; 5=columns) 
*/
   Fixed         vRes;                   /* Vertical resolution pixels/inch */
   gint16        vResUnit;               /* Vertical display resolution unit */
-  gint16        heightUnit;             /* Height unit ?? */
+  gint16        heightUnit;             /* Display height unit */
 } ResolutionInfo;
 
 /* Grid & guide header */