plug-ins: add option to crop layers to image bounds when exporting TIFF

In file-tiff, add an option to crop the layers to the image bounds
when exporting individual layers (using GIMP_EXPORT_NEEDS_CROP
added in the previous commit), since TIFF has no concept of global
image bounds otherwise.  Cropping is enabled by default.

plug-ins/file-tiff/file-tiff-save.c

@@ -1271,6 +1271,18 @@ save_dialog (TiffSaveVals  *tsvals,
                     G_CALLBACK (gimp_toggle_button_update),
                     &tsvals->save_layers);
 
+  frame = GTK_WIDGET (gtk_builder_get_object (builder, "layers-frame"));
+  g_object_bind_property (toggle, "active",
+                          frame,  "sensitive",
+                          G_BINDING_SYNC_CREATE);
+
+  toggle = GTK_WIDGET (gtk_builder_get_object (builder, "crop-layers"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+                                tsvals->crop_layers);
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &tsvals->crop_layers);
+
   gtk_widget_show (dialog);
 
   run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);

plug-ins/file-tiff/file-tiff-save.h

@@ -34,6 +34,7 @@ typedef struct
   gboolean  save_thumbnail;
   gboolean  save_profile;
   gboolean  save_layers;
+  gboolean  crop_layers;
 } TiffSaveVals;
 
 

plug-ins/file-tiff/file-tiff.c

@@ -88,7 +88,8 @@ static TiffSaveVals tsvals =
   FALSE,               /*  save iptc           */
   TRUE,                /*  save thumbnail      */
   TRUE,                /*  save profile        */
-  TRUE                 /*  save layer          */
+  TRUE,                /*  save layers         */
+  TRUE                 /*  crop layers         */
 };
 
 static gchar *image_comment = NULL;
@@ -392,7 +393,12 @@ run (const gchar      *name,
                                GIMP_EXPORT_CAN_HANDLE_ALPHA;
 
               if (tsvals.save_layers)
-                capabilities |= GIMP_EXPORT_CAN_HANDLE_LAYERS;
+                {
+                  capabilities |= GIMP_EXPORT_CAN_HANDLE_LAYERS;
+
+                  if (tsvals.crop_layers)
+                    capabilities |= GIMP_EXPORT_NEEDS_CROP;
+                }
 
               export = gimp_export_image (&image, &drawable, "TIFF", capabilities);
 

plug-ins/ui/plug-in-file-tiff.ui

@@ -54,6 +54,26 @@
             <property name="position">0</property>
           </packing>
         </child>
+        <child>
+          <object class="GimpFrame" id="layers-frame">
+            <property name="visible">True</property>
+            <child>
+              <object class="GtkCheckButton" id="crop-layers">
+                <property name="label" translatable="yes">Cr_op layers to image bounds</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">False</property>
+                <property name="use_underline">True</property>
+                <property name="draw_indicator">True</property>
+              </object>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
         <child>
           <object class="GtkCheckButton" id="save-alpha">
             <property name="label" translatable="yes">Save color _values from transparent pixels</property>
@@ -67,7 +87,7 @@
           <packing>
             <property name="expand">True</property>
             <property name="fill">True</property>
-            <property name="position">1</property>
+            <property name="position">2</property>
           </packing>
         </child>
       </object>