File: xcftools.h

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/* Generic functions and macros for reading XCF files
 *
 * This file was written by Henning Makholm <henning@makholm.net>
 * It is hereby in the public domain.
 * 
 * In jurisdictions that do not recognise grants of copyright to the
 * public domain: I, the author and (presumably, in those jurisdictions)
 * copyright holder, hereby permit anyone to distribute and use this code,
 * in source code or binary form, with or without modifications. This
 * permission is world-wide and irrevocable.
 *
 * Of course, I will not be liable for any errors or shortcomings in the
 * code, since I give it away without asking any compenstations.
 *
 * If you use or distribute this code, I would appreciate receiving
 * credit for writing it, in whichever way you find proper and customary.
 */

#ifndef XCFTOOLS_H
#define XCFTOOLS_H

#include "config.h"
#include "enums.h"
#include <stddef.h>
#include <stdio.h>

#if defined(HAVE_GETTEXT) && defined(ENABLE_NLS)
#include <libintl.h>
#define _(s) gettext(s)
void nls_init(void);
#else
#define _(s) (s)
#define nls_init() (void)0
#endif
#define N_(s) (s)

#if HAVE_INTTYPES_H
# define __STDC_FORMAT_MACROS
# include <inttypes.h>
#else
/* These legacy fall-backs will probably work on every system
 * that does not supply a inttypes.h ... */
typedef unsigned char     uint8_t ;
typedef unsigned long int uint32_t, uintptr_t ;
typedef signed char       int8_t ;
typedef signed long int   int32_t ;
# define PRIX32 "lX"
# define PRIu32 "lu"
# define PRIXPTR "lX"
#endif

#if __GNUC__
# define __ATTRIBUTE__ __attribute__
#else
# define __ATTRIBUTE__(x)
#endif

#if HAVE_NETINET_IN_H
# include <netinet/in.h>
#elif HAVE_ARPA_INET_H
# include <arpa/inet.h>
#elif WORDS_BIGENDIAN
# define ntohl(x) (x)
#else
static inline uint32_t ntohl(uint32_t a) {
  return (a << 24) + ((a & 0xFF00) << 8) + ((a >> 8) & 0xFF00) + (a >> 24) ;
}
#endif

#ifndef HAVE_STRCASECMP
#define strcasecmp strcmp
#endif

/* Read a single word value from the XCF file */

/* Use + instead of | because that allows LEA instructions */
#define xcfBE(a) ( ((uint32_t)xcf_file[(a)  ] << 24) + \
                   ((uint32_t)xcf_file[(a)+1] << 16) + \
                   ((uint32_t)xcf_file[(a)+2] << 8 ) + \
                   ((uint32_t)xcf_file[(a)+3]      ) )
#define xcfLE(a) ( ((uint32_t)xcf_file[(a)  ]      ) + \
                   ((uint32_t)xcf_file[(a)+1] << 8 ) + \
                   ((uint32_t)xcf_file[(a)+2] << 16) + \
                   ((uint32_t)xcf_file[(a)+3] << 24) )

#if CAN_DO_UNALIGNED_WORDS
# define xcfL(a) ntohl(*(uint32_t *)(xcf_file + (a)))
#else
# define xcfL(a) ((a) & 3 ? xcfBE(a) : ntohl(*(uint32_t *)(xcf_file + (a))))
#endif

/* ****************************************************************** */

/* The following are exported from am OS-specific source file;
 * io-unix.c on unixish systems.
 */
void read_or_mmap_xcf(const char* filename, const char *unzipper);
void free_or_close_xcf(void);

/* ****************************************************************** */
/* utils.c */

extern const char *progname ;
extern int verboseFlag ;

void *xcfmalloc(size_t size);
void xcffree(void*);

void FatalGeneric(int status,const char* format,...)
     __ATTRIBUTE__((format(printf,2,3),noreturn)) ;
void FatalUnexpected(const char* format,...)
     __ATTRIBUTE__((format(printf,1,2),noreturn)) ;
void FatalBadXCF(const char* format,...)
     __ATTRIBUTE__((format(printf,1,2),noreturn)) ;
void FatalUnsupportedXCF(const char* format,...)
     __ATTRIBUTE__((format(printf,1,2),noreturn)) ;

void gpl_blurb(void) __ATTRIBUTE__((noreturn));
     
FILE* openout(const char*);
void closeout(FILE *,const char*);

struct rect {
  int t, b, l, r ;
};

#define isSubrect(A,B) \
  ((A).l >= (B).l && (A).r <= (B).r && (A).t >= (B).t && (A).b <= (B).b)
#define disjointRects(A,B) \
  ((A).l >= (B).r || (A).r <= (B).l || (A).t >= (B).b || (A).b <= (B).t)

/* ****************************************************************** */
/* xcf-general.c */

extern uint8_t *xcf_file ;
extern size_t xcf_length ;
extern int use_utf8 ;

void xcfCheckspace(uint32_t addr,int spaceafter, const char *format,...)
     __ATTRIBUTE__((format(printf,3,4)));
uint32_t xcfOffset(uint32_t addr,int spaceafter);

int xcfNextprop(uint32_t *master,uint32_t *body);
const char* xcfString(uint32_t ptr,uint32_t *after);

/* These are hardcoded in the Gimp sources: */
#define TILE_SHIFT 6
#define TILE_WIDTH (1<<TILE_SHIFT)
#define TILE_HEIGHT (1<<TILE_SHIFT)
/* These definitions of TILE_LEFT and TILE_TOP work correctly for negative
 * numbers, but on the other hand depend on TILE_WIDTH and TILE_HEIGHT
 * being powers of 2. That's okay, because the tile size cannot change
 * anyway.
 */
#define TILE_LEFT(x) ((x) & -TILE_WIDTH)
#define TILE_TOP(y) ((y) & -TILE_HEIGHT)
#define TILE_NUM(x) ((x) >> TILE_SHIFT)

struct tileDimensions {
  struct rect c ;
  unsigned width, height ;
  unsigned tilesx, tilesy ;
  unsigned ntiles ;
};
/* computeDimensions assumes that width, height, c.l, and c.t are set */
void computeDimensions(struct tileDimensions *);

struct xcfTiles {
  const struct _convertParams *params ;
  uint32_t *tileptrs ;
  uint32_t hierarchy ;
};

struct xcfLayer {
  struct tileDimensions dim ;
  const char *name ;
  GimpLayerModeEffects mode ;
  GimpImageType type ;
  unsigned int opacity ;
  int isVisible, hasMask ;
  uint32_t propptr ;
  struct xcfTiles pixels ;
  struct xcfTiles mask ;
}; 

extern struct xcfImage {
  int version ;
  unsigned width, height ;
  GimpImageBaseType type ;
  XcfCompressionType compression ;
  int numLayers ;
  struct xcfLayer *layers ;
  uint32_t colormapptr ;
} XCF ;

void getBasicXcfInfo(void);

#endif /* XCFTOOLS_H */