[gimp] file-tiff-save: Add support for saving 16-bit TIFFs

[Mukund Sivaraman <muks src gnome org>]

commit 46a0dee673eceb33a1ee691301c65e8e43091c37
Author: Mukund Sivaraman <muks banu com>
Date:   Tue May 14 14:01:06 2013 +0530

    file-tiff-save: Add support for saving 16-bit TIFFs

 plug-ins/common/file-tiff-save.c |   37 +++++++++++++++++++++++++------------
 1 files changed, 25 insertions(+), 12 deletions(-)
---
diff --git a/plug-ins/common/file-tiff-save.c b/plug-ins/common/file-tiff-save.c
index 9b76611..9e68abd 100644
--- a/plug-ins/common/file-tiff-save.c
+++ b/plug-ins/common/file-tiff-save.c
@@ -720,6 +720,11 @@ save_image (const gchar  *filename,
   gimp_progress_init_printf (_("Saving '%s'"),
                              gimp_filename_to_utf8 (filename));
 
+  if (gimp_image_get_precision (image) == GIMP_PRECISION_U8)
+    bitspersample = 8;
+  else
+    bitspersample = 16;
+
   drawable_type = gimp_drawable_type (layer);
   buffer = gimp_drawable_get_buffer (layer);
 
@@ -731,39 +736,47 @@ save_image (const gchar  *filename,
     case GIMP_RGB_IMAGE:
       predictor       = 2;
       samplesperpixel = 3;
-      bitspersample   = 8;
       photometric     = PHOTOMETRIC_RGB;
-      bytesperrow     = cols * 3;
       alpha           = FALSE;
-      format          = babl_format ("R'G'B' u8");
+      if (bitspersample == 8)
+        format        = babl_format ("R'G'B' u8");
+      else
+        format        = babl_format ("R'G'B' u16");
+      bytesperrow     = cols * babl_format_get_bytes_per_pixel (format);
       break;
 
     case GIMP_GRAY_IMAGE:
       samplesperpixel = 1;
-      bitspersample   = 8;
       photometric     = PHOTOMETRIC_MINISBLACK;
-      bytesperrow     = cols;
       alpha           = FALSE;
-      format          = babl_format ("Y' u8");
+      if (bitspersample == 8)
+        format        = babl_format ("Y' u8");
+      else
+        format        = babl_format ("Y' u16");
+      bytesperrow     = cols * babl_format_get_bytes_per_pixel (format);
       break;
 
     case GIMP_RGBA_IMAGE:
       predictor       = 2;
       samplesperpixel = 4;
-      bitspersample   = 8;
       photometric     = PHOTOMETRIC_RGB;
-      bytesperrow     = cols * 4;
       alpha           = TRUE;
-      format          = babl_format ("R'G'B'A u8");
+      if (bitspersample == 8)
+        format        = babl_format ("R'G'B'A u8");
+      else
+        format        = babl_format ("R'G'B'A u16");
+      bytesperrow     = cols * babl_format_get_bytes_per_pixel (format);
       break;
 
     case GIMP_GRAYA_IMAGE:
       samplesperpixel = 2;
-      bitspersample   = 8;
       photometric     = PHOTOMETRIC_MINISBLACK;
-      bytesperrow     = cols * 2;
       alpha           = TRUE;
-      format          = babl_format ("Y'A u8");
+      if (bitspersample == 8)
+        format        = babl_format ("Y'A u8");
+      else
+        format        = babl_format ("Y'A u16");
+      bytesperrow     = cols * babl_format_get_bytes_per_pixel (format);
       break;
 
     case GIMP_INDEXED_IMAGE: