535 lines
17 KiB
C
535 lines
17 KiB
C
/* PIKA - Photo and Image Kooker Application
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* Amiga IFF plug-in
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*
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* Copyright (C) 2023 Alex S.
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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 <string.h>
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#include <errno.h>
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#include <glib/gstdio.h>
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#include <libpika/pika.h>
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#include <libpika/pikaui.h>
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#include <libilbm/ilbm.h>
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#include <libilbm/ilbmimage.h>
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#include <libilbm/interleave.h>
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#include <libilbm/byterun.h>
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#include "libpika/stdplugins-intl.h"
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#define LOAD_PROC "file-iff-load"
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#define PLUG_IN_BINARY "file-iff"
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#define PLUG_IN_ROLE "pika-file-iff"
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typedef struct _Iff Iff;
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typedef struct _IffClass IffClass;
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struct _Iff
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{
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PikaPlugIn parent_instance;
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};
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struct _IffClass
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{
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PikaPlugInClass parent_class;
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};
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#define IFF_TYPE (iff_get_type ())
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#define IFF(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), IFF_TYPE, Iff))
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GType iff_get_type (void) G_GNUC_CONST;
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static GList * iff_query_procedures (PikaPlugIn *plug_in);
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static PikaProcedure * iff_create_procedure (PikaPlugIn *plug_in,
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const gchar *name);
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static PikaValueArray * iff_load (PikaProcedure *procedure,
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PikaRunMode run_mode,
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GFile *file,
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PikaMetadata *metadata,
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PikaMetadataLoadFlags *flags,
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PikaProcedureConfig *config,
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gpointer run_data);
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static PikaImage * load_image (GFile *file,
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GObject *config,
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PikaRunMode run_mode,
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GError **error);
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static void deleave_indexed_row (IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width,
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gint nPlanes);
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static void deleave_rgb_row (IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width,
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gint nPlanes,
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gint pixel_size);
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static void deleave_ham_row (const guchar *pika_cmap,
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IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width,
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gint nPlanes);
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static void pbm_row (IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width);
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G_DEFINE_TYPE (Iff, iff, PIKA_TYPE_PLUG_IN)
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PIKA_MAIN (IFF_TYPE)
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DEFINE_STD_SET_I18N
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static void
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iff_class_init (IffClass *klass)
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{
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PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
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plug_in_class->query_procedures = iff_query_procedures;
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plug_in_class->create_procedure = iff_create_procedure;
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plug_in_class->set_i18n = STD_SET_I18N;
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}
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static void
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iff_init (Iff *iff)
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{
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}
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static GList *
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iff_query_procedures (PikaPlugIn *plug_in)
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{
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GList *list = NULL;
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list = g_list_append (list, g_strdup (LOAD_PROC));
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return list;
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}
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static PikaProcedure *
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iff_create_procedure (PikaPlugIn *plug_in,
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const gchar *name)
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{
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PikaProcedure *procedure = NULL;
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if (! strcmp (name, LOAD_PROC))
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{
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procedure = pika_load_procedure_new (plug_in, name,
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PIKA_PDB_PROC_TYPE_PLUGIN,
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iff_load, NULL, NULL);
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pika_procedure_set_menu_label (procedure, _("Amiga IFF"));
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pika_procedure_set_documentation (procedure,
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_("Load file in the IFF file format"),
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_("Load file in the IFF file format"),
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name);
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pika_procedure_set_attribution (procedure,
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"Alex S.",
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"Alex S.",
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"2023");
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pika_file_procedure_set_mime_types (PIKA_FILE_PROCEDURE (procedure),
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"image/x-ilbm");
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pika_file_procedure_set_extensions (PIKA_FILE_PROCEDURE (procedure),
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"iff,ilbm,lbm,acbm,ham,ham6,ham8");
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pika_file_procedure_set_magics (PIKA_FILE_PROCEDURE (procedure),
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"0,string,FORM");
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}
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return procedure;
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}
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static PikaValueArray *
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iff_load (PikaProcedure *procedure,
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PikaRunMode run_mode,
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GFile *file,
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PikaMetadata *metadata,
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PikaMetadataLoadFlags *flags,
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PikaProcedureConfig *config,
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gpointer run_data)
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{
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PikaValueArray *return_vals;
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PikaImage *image;
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GError *error = NULL;
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gegl_init (NULL, NULL);
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image = load_image (file, G_OBJECT (config), run_mode, &error);
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if (! image)
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_EXECUTION_ERROR,
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error);
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return_vals = pika_procedure_new_return_values (procedure,
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PIKA_PDB_SUCCESS,
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NULL);
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PIKA_VALUES_SET_IMAGE (return_vals, 1, image);
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return return_vals;
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}
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static PikaImage *
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load_image (GFile *file,
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GObject *config,
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PikaRunMode run_mode,
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GError **error)
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{
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PikaImage *image = NULL;
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PikaLayer *layer;
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GeglBuffer *buffer;
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FILE *fp;
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guint imagesLength;
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IFF_Chunk *chunk;
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ILBM_Image **iff_image;
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fp = g_fopen (g_file_peek_path (file), "rb");
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if (! fp)
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{
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g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
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_("Could not open '%s' for reading: %s"),
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pika_file_get_utf8_name (file), g_strerror (errno));
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return NULL;
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}
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fclose (fp);
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chunk = ILBM_read (g_file_peek_path (file));
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iff_image = ILBM_extractImages (chunk, &imagesLength);
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for (gint i = 0; i < imagesLength; i++)
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{
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ILBM_Image *true_image = iff_image[i];
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/* Struct representing bitmap header properties */
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ILBM_BitMapHeader *bitMapHeader = true_image->bitMapHeader;
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/* Struct containing the color palette */
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ILBM_ColorMap *colorMap = true_image->colorMap;
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ILBM_Viewport *camg = true_image->viewport;
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IFF_UByte *bitplanes;
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PikaImageType image_type;
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guchar pika_cmap[768]; /* Max index is (2^nplanes) - 1 */
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gint width;
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gint height;
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gint nPlanes;
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gint palette_size = 0;
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gint row_length;
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gint pixel_size = 1;
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gint y_height = 0;
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gboolean ehb_mode = FALSE;
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gboolean ham_mode = FALSE;
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if (! true_image || ! bitMapHeader)
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{
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g_message (_("Invalid or missing ILBM image"));
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return image;
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}
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if (! true_image->body)
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{
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g_message (_("ILBM contains no image data - likely a palette file"));
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return NULL;
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}
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/* Convert ACBM files to ILBM format */
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if (ILBM_imageIsACBM (true_image))
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ILBM_convertACBMToILBM (true_image);
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width = bitMapHeader->w;
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height = bitMapHeader->h;
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nPlanes = bitMapHeader->nPlanes;
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row_length = (width + 15) / 16;
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pixel_size = nPlanes / 8;
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/* Check for ILBM variants in CMAG chunk */
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if (camg)
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{
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if (camg->viewportMode & (1 << 7))
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ehb_mode = TRUE;
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if (camg->viewportMode & (1 << 11) &&
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(nPlanes >= 5 && nPlanes <= 8))
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ham_mode = TRUE;
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}
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/* Load palette if it exists */
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if (colorMap)
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{
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palette_size = colorMap->colorRegisterLength;
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for (gint j = 0; j < palette_size; j++)
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{
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pika_cmap[j * 3] = colorMap->colorRegister[j].red;
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pika_cmap[j * 3 + 1] = colorMap->colorRegister[j].green;
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pika_cmap[j * 3 + 2] = colorMap->colorRegister[j].blue;
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}
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if (ehb_mode)
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{
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/* EHB mode adds 32 more colors. Each are half the RGB values
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* of the first 32 colors */
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for (gint j = 0; j < palette_size * 2; j++)
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{
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gint offset_index = j + 32;
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pika_cmap[offset_index * 3] =
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colorMap->colorRegister[j].red / 2;
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pika_cmap[offset_index * 3 + 1] =
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colorMap->colorRegister[j].green / 2;
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pika_cmap[offset_index * 3 + 2] =
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colorMap->colorRegister[j].blue / 2;
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}
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/* EHB mode always has 64 colors */
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palette_size = 64;
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}
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}
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if (ham_mode)
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pixel_size = 3;
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if (pixel_size == 4)
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{
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image_type = PIKA_RGBA_IMAGE;
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}
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else if (pixel_size == 3)
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{
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image_type = PIKA_RGB_IMAGE;
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}
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else
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{
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pixel_size = 1;
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image_type = PIKA_INDEXED_IMAGE;
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}
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ILBM_unpackByteRun (true_image);
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image = pika_image_new (width, height,
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pixel_size == 1 ? PIKA_INDEXED : PIKA_RGB);
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layer = pika_layer_new (image, _("Background"), width, height,
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image_type, 100,
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pika_image_get_default_new_layer_mode (image));
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pika_image_insert_layer (image, layer, NULL, 0);
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buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (layer));
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bitplanes = true_image->body->chunkData;
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/* Loading rows */
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for (gint j = 0; j < height; j++)
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{
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guchar *pixel_row;
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pixel_row = g_malloc (width * pixel_size * sizeof (guchar));
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/* PBM uses one byte per pixel index */
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if (ILBM_imageIsPBM (true_image))
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pbm_row (bitplanes, pixel_row, width);
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else if (pixel_size == 1)
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deleave_indexed_row (bitplanes, pixel_row, width, nPlanes);
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else if (ham_mode)
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deleave_ham_row (pika_cmap, bitplanes, pixel_row, width, nPlanes);
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else
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deleave_rgb_row (bitplanes, pixel_row, width, nPlanes, pixel_size);
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bitplanes += (row_length * 2 * nPlanes);
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gegl_buffer_set (buffer, GEGL_RECTANGLE (0, y_height, width, 1), 0,
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NULL, pixel_row, GEGL_AUTO_ROWSTRIDE);
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y_height++;
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g_free (pixel_row);
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}
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if (pixel_size == 1)
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pika_image_set_colormap (image, pika_cmap, palette_size);
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g_object_unref (buffer);
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}
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ILBM_freeImages (iff_image, imagesLength);
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return image;
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}
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static void
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deleave_indexed_row (IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width,
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gint nPlanes)
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{
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guchar index[width];
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gint row_length = ((width + 15) / 16) * 2;
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/* Initialize index array */
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for (gint i = 0; i < width; i++)
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index[i] = 0;
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/* Deleave rows */
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for (gint i = 0; i < row_length; i++)
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{
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for (gint j = 0; j < 8; j++)
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{
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guint8 bitmask = (1 << (8 - j)) - (1 << (7 - j));
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for (gint k = 0; k < nPlanes; k++)
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{
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guint8 update = (1 << (k + 1)) - (1 << (k));
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if (bitplanes[i + (row_length * k)] & bitmask)
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index[j + (i * 8)] += update;
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}
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}
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}
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/* Associate palette with pixels */
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for (gint i = 0; i < width; i++)
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pixel_row[i] = index[i];
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}
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static void
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deleave_ham_row (const guchar *pika_cmap,
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IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width,
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gint nPlanes)
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{
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const gint control_index[3] = {2, 0, 1};
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const gint row_length = ((width + 15) / 16) * 2;
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gint prior_rgb[3] = {0, 0, 0};
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gint current_index = 0;
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/* Deleave rows */
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for (gint i = 0; i < row_length; i++)
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{
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for (gint j = 0; j < 8; j++)
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{
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guint8 bitmask = (1 << (8 - j)) - (1 << (7 - j));
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guint8 control = 0;
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guint8 color = 0;
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guint8 index = 0;
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for (gint k = 0; k < nPlanes; k++)
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{
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if (bitplanes[i + (row_length * k)] & bitmask)
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{
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gint limit = nPlanes < 7 ? 4 : 6;
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/* The last two planes are control values.
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* Everything else is either an index or a color.
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* For HAM 5/6 colors, we use the 4 bits as both
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* upper and lower bit modifiers. For HAM 7/8,
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* we replace the 6 MSB with the color value. */
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if (k < limit)
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{
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gint update = 1 << k;
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index += update;
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if (limit == 4)
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color += update + (update << 4);
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else
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color += update;
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}
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else
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{
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control += 1 << (k - limit);
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}
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}
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}
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if (control == 0)
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{
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prior_rgb[0] = pika_cmap[index * 3];
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prior_rgb[1] = pika_cmap[index * 3 + 1];
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prior_rgb[2] = pika_cmap[index * 3 + 2];
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}
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else
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{
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/* Determines which RGB component to modify */
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gint modify = control_index[control - 1];
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if (nPlanes < 7)
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prior_rgb[modify] = color;
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else
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prior_rgb[modify] = (color << 2) + (prior_rgb[modify] & 3);
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}
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pixel_row[current_index * 3] = prior_rgb[0];
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pixel_row[current_index * 3 + 1] = prior_rgb[1];
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pixel_row[current_index * 3 + 2] = prior_rgb[2];
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current_index++;
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}
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}
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}
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static void
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deleave_rgb_row (IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width,
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gint nPlanes,
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gint pixel_size)
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{
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gint row_length = ((width + 15) / 16) * 2;
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gint current_pixel = 0;
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/* Initialize index array */
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for (gint i = 0; i < (width * pixel_size); i++)
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pixel_row[i] = 0;
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/* Deleave rows */
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for (gint i = 0; i < row_length; i++)
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{
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for (gint j = 0; j < 8; j++)
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{
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guint8 bitmask = (1 << (8 - j)) - (1 << (7 - j));
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for (gint k = 0; k < pixel_size; k++)
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{
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for (gint l = 0; l < 8; l++)
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{
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guint8 update = (1 << (l + 1)) - (1 << (l));
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if (bitplanes[i + (row_length * (l + k * 8))] & bitmask)
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pixel_row[current_pixel] += update;
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}
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current_pixel++;
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}
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}
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}
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}
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static void
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pbm_row (IFF_UByte *bitplanes,
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guchar *pixel_row,
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gint width)
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{
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for (gint i = 0; i < width; i++)
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pixel_row[i] = bitplanes[i];
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}
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