aseprite/src/util/msk_file.cpp

/* ASE - Allegro Sprite Editor
 * Copyright (C) 2001-2009  David Capello
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"

#include <allegro.h>

#include "raster/image.h"
#include "raster/mask.h"
#include "util/pic_file.h"

/* loads a MSK file (Animator and Animator Pro format) */
Mask *load_msk_file(const char *filename)
{
#if (MAKE_VERSION(4, 2, 1) >= MAKE_VERSION(ALLEGRO_VERSION,		\
					   ALLEGRO_SUB_VERSION,		\
					   ALLEGRO_WIP_VERSION))
  int orig_size = file_size(filename);
#else
  int orig_size = file_size_ex(filename);
#endif
  int i, c, u, v, byte, magic, size;
  Mask *mask = NULL;
  PACKFILE *f;

  f = pack_fopen(filename, F_READ);
  if (!f)
    return NULL;

  size = pack_igetl(f);
  magic = pack_igetw(f);

  /* Animator Pro MSK format */
  if ((size == orig_size) && (magic == 0x9500)) {
    Image *image;
    int x, y;

    pack_fclose(f);

    /* just load an Animator Pro PIC file */
    image = load_pic_file(filename, &x, &y, NULL);
    if ((!image) || (image->imgtype != IMAGE_BITMAP)) {
      if (image)
	image_free(image);
    }
    else {
      mask = mask_new();
      mask->x = x;
      mask->y = y;
      mask->w = image->w;
      mask->h = image->h;
      mask->bitmap = image;
    }
  }
  /* Animator MSK format */
  else if (orig_size == 8000) {
    mask = mask_new();
    mask_replace(mask, 0, 0, 320, 200);

    u = v = 0;
    for (i=0; i<8000; i++) {
      byte = pack_getc (f);
      for (c=0; c<8; c++) {
	mask->bitmap->method->putpixel(mask->bitmap, u, v, byte & (1<<(7-c)));
	u++;
	if (u == 320) {
	  u = 0;
	  v++;
	}
      }
    }
    pack_fclose(f);
  }
  else {
    pack_fclose(f);
  }

  return mask;
}

/* saves an Animator Pro MSK file (really a PIC file) */
int save_msk_file(Mask *mask, const char *filename)
{
  if (mask->bitmap)
    return save_pic_file(filename, mask->x, mask->y, NULL, mask->bitmap);
  else
    return -1;
}