238 lines
7.7 KiB
C
238 lines
7.7 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "libpika/pika.h"
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#include "tinyscheme/scheme-private.h"
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#include "scheme-marshal.h"
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#include "script-fu-errors.h"
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/*
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* Marshal arguments to, and return values from, calls to PDB.
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* Convert Scheme constructs to/from a GValue.
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*
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* For each marshalling function:
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* - a returned "pointer" is a scheme pointer to a foreign error or NULL.
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* - marshal into a GValue holding a designated type,
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* usually a PIKA type but also GLib types, e.g. GFile.
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* The GValue's held type is already set, but value is uninitialized.
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*
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* When marshalling into a PikaObjectArray, arbitrarily say the contained type is PIKA_TYPE_DRAWABLE.
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* The actual contained type is opaque to the PDB calling mechanism.
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* Setting the GValue's value does not check the contained type.
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* But we do call pika_drawable_get_by_id.
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* PIKA_TYPE_DRAWABLE is a superclass of most common uses.
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* But perhaps we should call pika_item_get_by_id
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* and arbitrarily say PIKA_TYPE_ITEM, a superclass of drawable.
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*/
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/* Marshal single drawable ID from script into a single GObject. */
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pointer
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marshal_ID_to_drawable (scheme *sc,
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pointer a,
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gint id,
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GValue *value)
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{
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PikaDrawable *drawable;
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pointer error = get_drawable_from_script (sc, a, id, &drawable);
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if (error)
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return error;
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/* drawable is NULL or valid */
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/* Shallow copy, adding a reference while the GValue exists. */
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g_value_set_object (value, drawable);
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return NULL; /* no error */
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}
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/* Marshal a vector of ID into PikaObjectArray of same length. */
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pointer
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marshal_vector_to_drawable_array (scheme *sc,
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pointer vector,
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GValue *value)
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{
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PikaDrawable **drawable_array;
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gint id;
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pointer error;
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guint num_elements = sc->vptr->vector_length (vector);
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g_debug ("vector has %d elements", num_elements);
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/* empty vector will produce empty PikaObjectArray */
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drawable_array = g_new0 (PikaDrawable*, num_elements);
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for (int j = 0; j < num_elements; ++j)
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{
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pointer element = sc->vptr->vector_elem (vector, j);
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if (!sc->vptr->is_number (element))
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{
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g_free (drawable_array);
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return script_error (sc, "Expected numeric in drawable vector", vector);
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/* FUTURE more detailed error msg:
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* return script_type_error_in_container (sc, "numeric", i, j, proc_name, vector);
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*/
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}
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id = sc->vptr->ivalue (element);
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error = get_drawable_from_script (sc, element, id, &drawable_array[j]);
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if (error)
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{
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g_free (drawable_array);
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return error;
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}
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}
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/* Shallow copy. */
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pika_value_set_object_array (value, PIKA_TYPE_DRAWABLE, (GObject**)drawable_array, num_elements);
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g_free (drawable_array);
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return NULL; /* no error */
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}
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/* Marshal path string from script into a GValue holding type GFile */
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void
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marshal_path_string_to_gfile (scheme *sc,
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pointer a,
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GValue *value)
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{
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/* require sc->vptr->is_string (sc->vptr->pair_car (a)) */
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GFile *gfile = g_file_new_for_path (sc->vptr->string_value (sc->vptr->pair_car (a)));
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/* GLib docs say that g_file_new_for_path():
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* "never fails, but the returned object might not support any I/O operation if path is malformed."
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*/
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g_value_set_object (value, gfile);
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g_debug ("gfile arg is '%s'\n", g_file_get_parse_name (gfile));
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}
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/* Marshal values returned from PDB call in a GValue, into a Scheme construct to a script. */
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/* Marshal a GValue holding a GFile into a string.
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*
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* Returns NULL or a string that must be freed.
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*/
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gchar *
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marshal_returned_gfile_to_string (GValue *value)
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{
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gchar * filepath = NULL;
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GObject *object = g_value_get_object (value);
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/* object can be NULL, the GValue's type only indicates what should have been returned. */
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if (object)
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{
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filepath = g_file_get_parse_name ((GFile *) object);
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/* GLib docs:
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* For local files with names that can safely be converted to UTF-8 the pathname is used,
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* otherwise the IRI is used (a form of URI that allows UTF-8 characters unescaped).
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*/
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}
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return filepath;
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}
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/* Marshal a PikaObjectArray into a Scheme list of ID's.
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*
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* Before v3.0, PDB procedure's return type was say INT32ARRAY,
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* preceded by a type INT32 designating array length.
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* Now return type is PikaObjectArray preceded by length.
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*
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* Returns a vector, since most arrays in Scriptfu are returned as vectors.
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* An alternate implementation would be return list.
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*
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* Existing scheme plugins usually expect PDB to return values: len, vector.
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* If ever the PDB is changed to be more object-oriented,
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* scripts could use a scheme call: (vector-length vector)
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* to get the length of the vector.
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*/
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pointer
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marshal_returned_object_array_to_vector (scheme *sc,
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GValue *value)
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{
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GObject **object_array;
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gint32 n;
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pointer vector;
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object_array = pika_value_get_object_array (value);
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/* array knows own length, ignore length in preceding return value */
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n = ((PikaObjectArray*)g_value_get_boxed (value))->length;
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vector = sc->vptr->mk_vector (sc, n);
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/* Iterate starting at the back of the array, and prefix to container
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* so the order of objects is not changed.
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*/
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for (int j = n - 1; j >= 0; j--)
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{
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GObject *object = object_array[j];
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gint id;
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if (object)
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g_object_get (object, "id", &id, NULL); /* get property "id" */
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else
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/* Scriptfu language represents NULL object by ID of -1*/
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id = -1;
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sc->vptr->set_vector_elem (vector, j, sc->vptr->mk_integer (sc, id));
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/* Alt: list = sc->vptr->cons (sc, sc->vptr->mk_integer (sc, id), list); */
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}
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/* ensure container's len equals object array's len and all elements are ID's or -1 */
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return vector;
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}
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/* From a script numeric (a drawable ID) set a handle to a drawable.
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* When ID is -1, sets drawable to NULL and returns no error.
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* When ID is valid, sets drawable and returns no error.
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* Otherwise (ID is not -1 and not valid ID of a drawable) returns error.
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*/
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pointer
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get_drawable_from_script (scheme *sc,
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pointer a,
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gint id,
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PikaDrawable **drawable_handle)
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{
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if (id == -1)
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{
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/* -1 is scriptfu language for NULL i.e. none for an optional */
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*drawable_handle = NULL;
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}
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else
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{
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*drawable_handle = pika_drawable_get_by_id (id);
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if (! *drawable_handle)
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return script_error (sc, "Invalid drawable ID", a);
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}
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/* ensure *drawable_handle is NULL or a valid reference to a drawable */
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return NULL; /* no error */
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}
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