Allow clipping to selection during export (#1113)

* Allow clipping to selection during export

* linting

* removed shader

src/Autoload/Export.gd

@@ -52,6 +52,7 @@ var blended_frames := {}
 var export_json := false
 var split_layers := false
 var trim_images := false
+var erase_unselected_area := false
 
 # Spritesheet options
 var orientation := Orientation.COLUMNS
@@ -288,6 +289,13 @@ func process_animation(project := Global.current_project) -> void:
 		else:
 			var image := Image.create(project.size.x, project.size.y, false, Image.FORMAT_RGBA8)
 			image.copy_from(blended_frames[frame])
+			if erase_unselected_area and project.has_selection:
+				var crop := Image.create(project.size.x, project.size.y, false, Image.FORMAT_RGBA8)
+				var selection_image = project.selection_map.return_cropped_copy(project.size)
+				crop.blit_rect_mask(
+					image, selection_image, Rect2i(Vector2i.ZERO, image.get_size()), Vector2i.ZERO
+				)
+				image.copy_from(crop)
 			if trim_images:
 				image = image.get_region(image.get_used_rect())
 			var duration := frame.duration * (1.0 / project.fps)

src/UI/Dialogs/ExportDialog.gd

@@ -464,6 +464,12 @@ func _on_trim_images_toggled(toggled_on: bool) -> void:
 	set_preview()
 
 
+func _on_clip_images_selection_toggled(toggled_on: bool) -> void:
+	Export.erase_unselected_area = toggled_on
+	Export.process_data()
+	set_preview()
+
+
 func _on_frames_item_selected(id: int) -> void:
 	Export.frame_current_tag = id
 	Export.process_data()

src/UI/Dialogs/ExportDialog.tscn

@@ -324,6 +324,12 @@ tooltip_text = "Trims the exported images to their visible portion, considering
 mouse_default_cursor_shape = 2
 text = "Trim images"
 
+[node name="ClipSelection" type="CheckBox" parent="VBoxContainer/VSplitContainer/VBoxContainer/AdvancedOptions/GridContainer" groups=["ExportImageOptions"]]
+layout_mode = 2
+tooltip_text = "Only shows content that is within the bounds of a selected area."
+mouse_default_cursor_shape = 2
+text = "Clip image content to selection"
+
 [node name="PathDialog" type="FileDialog" parent="." groups=["FileDialogs"]]
 mode = 2
 title = "Open a Directory"
@@ -379,6 +385,7 @@ size_flags_horizontal = 3
 [connection signal="toggled" from="VBoxContainer/VSplitContainer/VBoxContainer/AdvancedOptions/GridContainer/IncludeTagsInFilename" to="." method="_on_include_tags_in_filename_toggled"]
 [connection signal="toggled" from="VBoxContainer/VSplitContainer/VBoxContainer/AdvancedOptions/GridContainer/MultipleAnimationsDirectories" to="." method="_on_multiple_animations_directories_toggled"]
 [connection signal="toggled" from="VBoxContainer/VSplitContainer/VBoxContainer/AdvancedOptions/GridContainer/TrimImages" to="." method="_on_trim_images_toggled"]
+[connection signal="toggled" from="VBoxContainer/VSplitContainer/VBoxContainer/AdvancedOptions/GridContainer/ClipSelection" to="." method="_on_clip_images_selection_toggled"]
 [connection signal="canceled" from="PathDialog" to="." method="_on_path_dialog_canceled"]
 [connection signal="dir_selected" from="PathDialog" to="." method="_on_path_dialog_dir_selected"]
 [connection signal="confirmed" from="FileExistsAlert" to="." method="_on_file_exists_alert_confirmed"]