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Issue #5274 - Exporting as TIFF fails for layers with a negative offset 

When exporting a TIFF file without merging the image, make sure non
of the exported layers has a negative offset, by offsetting all the
layers as necessary.  TIFF doesn't support negative page offsets,
giving an error in libtiff.
This commit is contained in:
Ell 2020-06-25 17:05:59 +03:00
parent 8732f06196
commit 536bf771b7
1 changed files with 24 additions and 1 deletions
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25
plug-ins/file-tiff/file-tiff-save.c
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@ -275,6 +275,8 @@ save_layer (TIFF *tif,
gint32 num_pages,
GimpImage *orig_image, /* the export function might
* have created a duplicate */
gint origin_x,
gint origin_y,
gint *saved_bpp,
gboolean out_linear,
GError **error)
@ -693,6 +695,9 @@ save_layer (TIFF *tif,
gimp_drawable_offsets (GIMP_DRAWABLE (layer), &offset_x, &offset_y);
offset_x -= origin_x;
offset_y -= origin_y;
if (offset_x || offset_y)
{
TIFFSetField (tif, TIFFTAG_XPOSITION, offset_x / xresolution);
@ -951,6 +956,9 @@ save_image (GFile *file,
gint32 num_layers;
gint32 current_layer = 0;
GList *layers;
GList *iter;
gint origin_x = 0;
gint origin_y = 0;
gint saved_bpp;
gchar *config_comment;
gboolean config_save_profile;
@ -1046,11 +1054,25 @@ save_image (GFile *file,
if (config_save_thumbnail)
TIFFSetField (tif, TIFFTAG_SUBIFD, number_of_sub_IFDs, sub_IFDs_offsets);
/* calculate the top-left coordinates */
for (iter = layers; iter; iter = g_list_next (iter))
{
GimpDrawable *drawable = iter->data;
gint offset_x, offset_y;
gimp_drawable_offsets (drawable, &offset_x, &offset_y);
origin_x = MIN (origin_x, offset_x);
origin_y = MIN (origin_y, offset_y);
}
/* write last layer as first page. */
if (! save_layer (tif, config, space, image,
g_list_nth_data (layers, current_layer),
current_layer, num_layers,
orig_image, &saved_bpp, out_linear, error))
orig_image,
origin_x, origin_y,
&saved_bpp, out_linear, error))
{
goto out;
}
@ -1092,6 +1114,7 @@ save_image (GFile *file,
if (! save_layer (tif, config, space, image,
g_list_nth_data (layers, current_layer),
current_layer, num_layers, orig_image,
origin_x, origin_y,
&tmp_saved_bpp, out_linear, error))
{
goto out;