PIKApp/app/text/pikatextlayer-xcf.c

/* 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 <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include <cairo.h>

#include "libpikabase/pikabase.h"
#include "text-types.h"

#include "core/pika.h"
#include "core/pikadrawable-private.h" /* eek */
#include "core/pikaimage.h"
#include "core/pikaparasitelist.h"

#include "pikatext.h"
#include "pikatext-parasite.h"
#include "pikatextlayer.h"
#include "pikatextlayer-xcf.h"

#include "pika-intl.h"


enum
{
  TEXT_LAYER_XCF_NONE              = 0,
  TEXT_LAYER_XCF_DONT_AUTO_RENAME  = 1 << 0,
  TEXT_LAYER_XCF_MODIFIED          = 1 << 1
};


static PikaLayer * pika_text_layer_from_layer (PikaLayer *layer,
                                               PikaText  *text);


gboolean
pika_text_layer_xcf_load_hack (PikaLayer **layer)
{
  const gchar        *name;
  PikaText           *text = NULL;
  const PikaParasite *parasite;
  gboolean            before_xcf_v19 = FALSE;

  g_return_val_if_fail (layer != NULL, FALSE);
  g_return_val_if_fail (PIKA_IS_LAYER (*layer), FALSE);

  name = pika_text_parasite_name ();
  parasite = pika_item_parasite_find (PIKA_ITEM (*layer), name);

  if (parasite)
    {
      GError *error = NULL;

      text = pika_text_from_parasite (parasite,
                                      pika_item_get_image (PIKA_ITEM (*layer))->pika,
                                      &before_xcf_v19,
                                      &error);

      if (error)
        {
          pika_message (pika_item_get_image (PIKA_ITEM (*layer))->pika, NULL,
                        PIKA_MESSAGE_ERROR,
                        _("Problems parsing the text parasite for layer '%s':\n"
                          "%s\n\n"
                          "Some text properties may be wrong. "
                          "Unless you want to edit the text layer, "
                          "you don't need to worry about this."),
                        pika_object_get_name (*layer),
                        error->message);
          g_clear_error (&error);
        }
    }
  else
    {
      name = pika_text_gdyntext_parasite_name ();

      parasite = pika_item_parasite_find (PIKA_ITEM (*layer), name);

      if (parasite)
        {
          text = pika_text_from_gdyntext_parasite (parasite);
          before_xcf_v19 = TRUE;
        }
    }

  if (text)
    {
      *layer = pika_text_layer_from_layer (*layer, text);

      /*  let the text layer knows what parasite was used to create it  */
      PIKA_TEXT_LAYER (*layer)->text_parasite        = name;
      PIKA_TEXT_LAYER (*layer)->text_parasite_is_old = before_xcf_v19;
    }

  return (text != NULL);
}

void
pika_text_layer_xcf_save_prepare (PikaTextLayer *layer)
{
  PikaText *text;

  g_return_if_fail (PIKA_IS_TEXT_LAYER (layer));

  /*  If the layer has a text parasite already, it wasn't changed and we
   *  can simply save the original parasite back which is still attached.
   */
  if (layer->text_parasite)
    return;

  text = pika_text_layer_get_text (layer);
  if (text)
    {
      PikaParasite *parasite = pika_text_to_parasite (text);

      /*  Don't push an undo because the parasite only exists temporarily
       *  while the text layer is saved to XCF.
       */
      pika_item_parasite_attach (PIKA_ITEM (layer), parasite, FALSE);

      pika_parasite_free (parasite);
    }
}

guint32
pika_text_layer_get_xcf_flags (PikaTextLayer *text_layer)
{
  guint flags = 0;

  g_return_val_if_fail (PIKA_IS_TEXT_LAYER (text_layer), 0);

  if (! text_layer->auto_rename)
    flags |= TEXT_LAYER_XCF_DONT_AUTO_RENAME;

  if (text_layer->modified)
    flags |= TEXT_LAYER_XCF_MODIFIED;

  return flags;
}

void
pika_text_layer_set_xcf_flags (PikaTextLayer *text_layer,
                               guint32        flags)
{
  g_return_if_fail (PIKA_IS_TEXT_LAYER (text_layer));

  g_object_set (text_layer,
                "auto-rename", (flags & TEXT_LAYER_XCF_DONT_AUTO_RENAME) == 0,
                "modified",    (flags & TEXT_LAYER_XCF_MODIFIED)         != 0,
                NULL);
}


/**
 * pika_text_layer_from_layer:
 * @layer: a #PikaLayer object
 * @text: a #PikaText object
 *
 * Converts a standard #PikaLayer and a #PikaText object into a
 * #PikaTextLayer. The new text layer takes ownership of the @text and
 * @layer objects.  The @layer object is rendered unusable by this
 * function. Don't even try to use if afterwards!
 *
 * This is a gross hack that is needed in order to load text layers
 * from XCF files in a backwards-compatible way. Please don't use it
 * for anything else!
 *
 * Returns: a newly allocated #PikaTextLayer object
 **/
static PikaLayer *
pika_text_layer_from_layer (PikaLayer *layer,
                            PikaText  *text)
{
  PikaTextLayer *text_layer;
  PikaDrawable  *drawable;

  g_return_val_if_fail (PIKA_IS_LAYER (layer), NULL);
  g_return_val_if_fail (PIKA_IS_TEXT (text), NULL);

  text_layer = g_object_new (PIKA_TYPE_TEXT_LAYER,
                             "image", pika_item_get_image (PIKA_ITEM (layer)),
                             NULL);

  pika_item_replace_item (PIKA_ITEM (text_layer), PIKA_ITEM (layer));

  drawable = PIKA_DRAWABLE (text_layer);

  pika_drawable_steal_buffer (drawable, PIKA_DRAWABLE (layer));

  pika_layer_set_opacity         (PIKA_LAYER (text_layer),
                                  pika_layer_get_opacity (layer), FALSE);
  pika_layer_set_mode            (PIKA_LAYER (text_layer),
                                  pika_layer_get_mode (layer), FALSE);
  pika_layer_set_blend_space     (PIKA_LAYER (text_layer),
                                  pika_layer_get_blend_space (layer), FALSE);
  pika_layer_set_composite_space (PIKA_LAYER (text_layer),
                                  pika_layer_get_composite_space (layer), FALSE);
  pika_layer_set_composite_mode  (PIKA_LAYER (text_layer),
                                  pika_layer_get_composite_mode (layer), FALSE);
  pika_layer_set_lock_alpha      (PIKA_LAYER (text_layer),
                                  pika_layer_get_lock_alpha (layer), FALSE);

  pika_text_layer_set_text (text_layer, text);

  g_object_unref (text);
  g_object_unref (layer);

  return PIKA_LAYER (text_layer);
}