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PIKApp/app/text/pikatext-parasite.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* PikaText
* Copyright (C) 2003 Sven Neumann <sven@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <pango/pango.h>
#include "libpikabase/pikabase.h"
#include "libpikacolor/pikacolor.h"
#include "libpikaconfig/pikaconfig.h"
#include "text-types.h"
#include "core/pikaerror.h"
#include "pikafont.h"
#include "pikatext.h"
#include "pikatext-parasite.h"
#include "pikatext-xlfd.h"
#include "pika-intl.h"
/****************************************/
/* The native PikaTextLayer parasite. */
/****************************************/
const gchar *
pika_text_parasite_name (void)
{
return "pika-text-layer";
}
PikaParasite *
pika_text_to_parasite (PikaText *text)
{
g_return_val_if_fail (PIKA_IS_TEXT (text), NULL);
return pika_config_serialize_to_parasite (PIKA_CONFIG (text),
pika_text_parasite_name (),
PIKA_PARASITE_PERSISTENT,
NULL);
}
PikaText *
pika_text_from_parasite (const PikaParasite *parasite,
Pika *pika,
gboolean *before_xcf_v19,
GError **error)
{
PikaText *text;
gchar *parasite_data;
guint32 parasite_data_size;
g_return_val_if_fail (parasite != NULL, NULL);
g_return_val_if_fail (strcmp (pika_parasite_get_name (parasite),
pika_text_parasite_name ()) == 0, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
text = g_object_new (PIKA_TYPE_TEXT, "pika", pika, NULL);
g_object_set (text, "font", pika_font_get_standard(), NULL);
parasite_data = (gchar *) pika_parasite_get_data (parasite, &parasite_data_size);
if (parasite_data)
{
gboolean has_markup = g_str_has_prefix (parasite_data, "(markup ");
PikaParasite *new_parasite = NULL;
GString *new_data;
*before_xcf_v19 = (strstr (parasite_data, "(font \"PikaFont\"") == NULL);
/* This is for backward compatibility with older xcf files.
* font used to be serialized as a string, but now it is serialized/deserialized as
* PikaFont, so the object Type name is inserted for the PikaFont deserialization function to be called.
* And more importantly, fonts in the markup are extracted into their own fields for deserialization.
*/
if (*before_xcf_v19)
{
new_data = g_string_new (parasite_data);
g_string_replace (new_data, "\")\n(font", "\")\n(font \"PikaFont\"", 1);
if (has_markup)
{
char *markup_start = strstr (parasite_data, "\"<");
char *markup_end = strstr (parasite_data, ">\")");
if (markup_start != NULL && markup_end != NULL)
{
PangoAttrList *attr_list;
gchar *desc;
guint length;
GSList *list = NULL;
GSList *fonts = NULL;
GString *markup_fonts = g_string_new (NULL);
glong markup_start_pos;
glong markup_end_pos;
gchar *markup_str;
GString *markup;
markup_start_pos = (glong) (markup_start - parasite_data) + 1;
markup_end_pos = (glong) (markup_end - parasite_data) + 1;
markup_str = g_utf8_substring (parasite_data, markup_start_pos, markup_end_pos);
markup = g_string_new (markup_str);
g_string_replace (markup, "\\\"", "\"", 0);
pango_parse_markup (markup->str, -1, 0, &attr_list, NULL, NULL, NULL);
list = pango_attr_list_get_attributes (attr_list);
length = g_slist_length (list);
for (guint i = 0; i < length; ++i)
{
PangoAttrFontDesc *attr_font_desc = pango_attribute_as_font_desc ((PangoAttribute*)g_slist_nth_data (list, i));
if (attr_font_desc != NULL)
{
desc = pango_font_description_to_string (attr_font_desc->desc);
if (g_slist_find_custom (fonts, (gconstpointer) desc, (GCompareFunc) g_strcmp0) == NULL)
{
fonts = g_slist_prepend (fonts, (gpointer) desc);
/*duplicate font name to making parsing easier when deserializing*/
g_string_append_printf (markup_fonts,
"\n\"%s\" \"%s\"",
desc, desc);
}
else
{
g_free (desc);
}
}
}
g_slist_free_full (fonts, (GDestroyNotify) g_free);
g_slist_free_full (list, (GDestroyNotify) pango_attribute_destroy);
pango_attr_list_unref (attr_list);
g_string_insert (new_data, markup_end_pos + 1, markup_fonts->str);
g_free (markup_str);
g_string_free (markup_fonts, TRUE);
g_string_free (markup, TRUE);
}
else
{
/* We could not find the markup delimiters. */
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("Invalid markup format in text parasite"));
}
}
new_parasite = pika_parasite_new (pika_parasite_get_name (parasite),
pika_parasite_get_flags (parasite),
new_data->len+1,
new_data->str);
parasite = new_parasite;
g_string_free (new_data, TRUE);
}
if (error == NULL || *error == NULL)
pika_config_deserialize_parasite (PIKA_CONFIG (text),
parasite,
NULL,
error);
pika_parasite_free (new_parasite);
}
else
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("Empty text parasite"));
}
return text;
}
/****************************************************************/
/* Compatibility to plug-in GDynText 1.4.4 and later versions */
/* GDynText was written by Marco Lamberto <lm@geocities.com> */
/****************************************************************/
const gchar *
pika_text_gdyntext_parasite_name (void)
{
return "plug_in_gdyntext/data";
}
enum
{
TEXT = 0,
ANTIALIAS = 1,
ALIGNMENT = 2,
ROTATION = 3,
LINE_SPACING = 4,
COLOR = 5,
LAYER_ALIGNMENT = 6,
XLFD = 7,
NUM_PARAMS
};
PikaText *
pika_text_from_gdyntext_parasite (const PikaParasite *parasite)
{
PikaText *retval = NULL;
PikaTextJustification justify;
gchar *str;
gchar *text = NULL;
gchar **params;
guint32 parasite_data_size;
gboolean antialias;
gdouble spacing;
PikaRGB rgb;
glong color;
gint i;
g_return_val_if_fail (parasite != NULL, NULL);
g_return_val_if_fail (strcmp (pika_parasite_get_name (parasite),
pika_text_gdyntext_parasite_name ()) == 0,
NULL);
str = (gchar *) pika_parasite_get_data (parasite, &parasite_data_size);
str = g_strndup (str, parasite_data_size);
g_return_val_if_fail (str != NULL, NULL);
if (! g_str_has_prefix (str, "GDT10{")) /* magic value */
return NULL;
params = g_strsplit (str + strlen ("GDT10{"), "}{", -1);
/* first check that we have the required number of parameters */
for (i = 0; i < NUM_PARAMS; i++)
if (!params[i])
goto cleanup;
text = g_strcompress (params[TEXT]);
if (! g_utf8_validate (text, -1, NULL))
{
gchar *tmp = pika_any_to_utf8 (text, -1, NULL);
g_free (text);
text = tmp;
}
antialias = atoi (params[ANTIALIAS]) ? TRUE : FALSE;
switch (atoi (params[ALIGNMENT]))
{
default:
case 0: justify = PIKA_TEXT_JUSTIFY_LEFT; break;
case 1: justify = PIKA_TEXT_JUSTIFY_CENTER; break;
case 2: justify = PIKA_TEXT_JUSTIFY_RIGHT; break;
}
spacing = g_strtod (params[LINE_SPACING], NULL);
color = strtol (params[COLOR], NULL, 16);
pika_rgba_set_uchar (&rgb, color >> 16, color >> 8, color, 255);
retval = g_object_new (PIKA_TYPE_TEXT,
"text", text,
"antialias", antialias,
"justify", justify,
"line-spacing", spacing,
"color", &rgb,
NULL);
pika_text_set_font_from_xlfd (PIKA_TEXT (retval), params[XLFD]);
cleanup:
g_free (str);
g_free (text);
g_strfreev (params);
return retval;
}
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