libvips/include/vips/dispatch.h

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/* VIPS function dispatch.
*
* J. Cupitt, 8/4/93.
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifndef IM_DISPATCH_H
#define IM_DISPATCH_H
#ifdef __cplusplus
extern "C" {
#endif /*__cplusplus*/
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#include <glib-object.h>
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#include <vips/vips.h>
#include <vips/util.h>
/* Type names. You may define your own, but if you use one of these, then
* you should use the built-in VIPS type converters.
*/
#define IM_TYPE_IMAGEVEC "imagevec" /* im_object is ptr to IMAGE[] */
#define IM_TYPE_DOUBLEVEC "doublevec" /* im_object is ptr to double[] */
#define IM_TYPE_INTVEC "intvec" /* im_object is ptr to int[] */
#define IM_TYPE_DOUBLE "double" /* im_object is ptr to double */
#define IM_TYPE_INT "integer" /* 32-bit integer */
#define IM_TYPE_COMPLEX "complex" /* Pair of doubles */
#define IM_TYPE_STRING "string" /* Zero-terminated char array */
#define IM_TYPE_IMASK "intmask" /* Integer mask type */
#define IM_TYPE_DMASK "doublemask" /* Double mask type */
#define IM_TYPE_IMAGE "image" /* IMAGE descriptor */
#define IM_TYPE_DISPLAY "display" /* Display descriptor */
#define IM_TYPE_GVALUE "gvalue" /* GValue wrapper */
typedef char *im_arg_type; /* Type of argument id */
/* Internal representation of an argument to an image processing function.
*/
typedef void *im_object;
/* These bits are ored together to make the flags in a type descriptor.
*
* IM_TYPE_OUTPUT: set to indicate output, otherwise input.
*
* IM_TYPE_ARG: Two ways of making an im_object --- with and without a
* command-line string to help you along. Arguments with a string are thing
* like IMAGE descriptors, which require a filename to initialise.
* Arguments without are things like output numbers, where making the object
* simply involves allocating storage.
*/
typedef enum {
IM_TYPE_NONE = 0, /* No flags */
IM_TYPE_OUTPUT = 0x1, /* Output/input object */
IM_TYPE_ARG = 0x2 /* Uses a str arg in construction */
} im_type_flags;
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/* Initialise, destroy and write objects. The "str" argument to the
* init function will not be supplied if this is not an ARG type. The
* write function writes to the GString.
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*/
typedef int (*im_init_obj_fn)( im_object *obj, char *str );
typedef int (*im_dest_obj_fn)( im_object obj );
/* Describe a VIPS type.
*/
typedef struct {
im_arg_type type; /* Type of argument */
int size; /* sizeof( im_object repres. ) */
im_type_flags flags; /* Flags */
im_init_obj_fn init; /* Operation functions */
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im_dest_obj_fn dest; /* Destroy object */
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} im_type_desc;
/* Success on an argument. This is called if the image processing function
* succeeds and should be used to (for example) print output.
*/
typedef int (*im_print_obj_fn)( im_object obj );
/* Describe a VIPS command argument.
*/
typedef struct {
char *name; /* eg. "width" */
im_type_desc *desc; /* Type description */
im_print_obj_fn print; /* Print some output objects */
} im_arg_desc;
/* Type of VIPS dispatch funtion.
*/
typedef int (*im_dispatch_fn)( im_object *argv );
/* Maximum size of arg table.
*/
#define IM_MAX_ARGS (1000)
/* Flags for functions. These are for information only, and more may be
* added.
*/
typedef enum {
IM_FN_NONE = 0, /* No flags set */
IM_FN_PIO = 0x1, /* Is a partial function */
IM_FN_TRANSFORM = 0x2, /* Performs coordinate transformations */
IM_FN_PTOP = 0x4, /* Point-to-point ... can be done with a LUT */
IM_FN_NOCACHE = 0x8 /* Result should not be cached */
} im_fn_flags;
/* Describe a VIPS function.
*/
typedef struct {
char *name; /* eg "im_invert" */
char *desc; /* Description - eg "photographic negative" */
im_fn_flags flags; /* Flags for this function */
im_dispatch_fn disp; /* Dispatch */
int argc; /* Number of args */
im_arg_desc *argv; /* Arg table */
} im_function;
/* A set of VIPS functions forming a package.
*/
typedef struct {
char *name; /* Package name (eg "arithmetic") */
int nfuncs; /* Number of functions in package */
im_function **table; /* Array of function descriptors */
} im_package;
/* Externs for dispatch.
*/
/* Struct for mask IO to a file.
*/
typedef struct {
char *name; /* Command-line name in */
void *mask; /* Mask --- DOUBLE or INT */
} im_mask_object;
/* Struct for doublevec IO
*/
typedef struct {
int n; /* Vector length */
double *vec; /* Vector */
} im_doublevec_object;
/* Struct for intvec IO
*/
typedef struct {
int n; /* Vector length */
int *vec; /* Vector */
} im_intvec_object;
/* Struct for imagevec IO
*/
typedef struct {
int n; /* Vector length */
IMAGE **vec; /* Vector */
} im_imagevec_object;
/* Built-in VIPS types.
*/
extern im_type_desc im__input_int;
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extern im_type_desc im__input_intvec;
extern im_type_desc im__input_imask;
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extern im_type_desc im__output_int;
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extern im_type_desc im__output_intvec;
extern im_type_desc im__output_imask;
extern im_type_desc im__input_double;
extern im_type_desc im__input_doublevec;
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extern im_type_desc im__input_dmask;
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extern im_type_desc im__output_double;
extern im_type_desc im__output_doublevec;
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extern im_type_desc im__output_dmask;
extern im_type_desc im__output_dmask_screen;
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extern im_type_desc im__output_complex;
extern im_type_desc im__input_string;
extern im_type_desc im__output_string;
extern im_type_desc im__input_imagevec;
extern im_type_desc im__input_image;
extern im_type_desc im__output_image;
extern im_type_desc im__rw_image;
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extern im_type_desc im__input_display;
extern im_type_desc im__output_display;
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extern im_type_desc im__input_gvalue;
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extern im_type_desc im__output_gvalue;
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/* VIPS print functions.
*/
int im__iprint( im_object obj ); /* int */
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int im__ivprint( im_object obj ); /* intvec */
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int im__dprint( im_object obj ); /* double */
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int im__dvprint( im_object obj ); /* doublevec */
int im__dmsprint( im_object obj ); /* DOUBLEMASK as stats */
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int im__cprint( im_object obj ); /* complex */
int im__sprint( im_object obj ); /* string */
int im__displayprint( im_object obj ); /* im_col_display */
int im__gprint( im_object obj ); /* GValue */
/* Macros for convenient creation.
*/
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#define IM_INPUT_INT( S ) { S, &im__input_int, NULL }
#define IM_INPUT_INTVEC( S ) { S, &im__input_intvec, NULL }
#define IM_INPUT_IMASK( S ) { S, &im__input_imask, NULL }
#define IM_OUTPUT_INT( S ) { S, &im__output_int, im__iprint }
#define IM_OUTPUT_INTVEC( S ) { S, &im__output_intvec, im__ivprint }
#define IM_OUTPUT_IMASK( S ) { S, &im__output_imask, NULL }
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#define IM_INPUT_DOUBLE( S ) { S, &im__input_double, NULL }
#define IM_INPUT_DOUBLEVEC( S ) { S, &im__input_doublevec, NULL }
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#define IM_INPUT_DMASK( S ) { S, &im__input_dmask, NULL }
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#define IM_OUTPUT_DOUBLE( S ) { S, &im__output_double, im__dprint }
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#define IM_OUTPUT_DOUBLEVEC( S ) { S, &im__output_doublevec, im__dvprint }
#define IM_OUTPUT_DMASK( S ) { S, &im__output_dmask, NULL }
#define IM_OUTPUT_DMASK_STATS( S ) { S, &im__output_dmask_screen, im__dmsprint }
#define IM_OUTPUT_COMPLEX( S ) { S, &im__output_complex, im__cprint }
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#define IM_INPUT_STRING( S ) { S, &im__input_string, NULL }
#define IM_OUTPUT_STRING( S ) { S, &im__output_string, im__sprint }
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#define IM_INPUT_IMAGE( S ) { S, &im__input_image, NULL }
#define IM_INPUT_IMAGEVEC( S ) { S, &im__input_imagevec, NULL }
#define IM_OUTPUT_IMAGE( S ) { S, &im__output_image, NULL }
#define IM_RW_IMAGE( S ) { S, &im__rw_image, NULL }
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#define IM_INPUT_DISPLAY( S ) { S, &im__input_display, NULL }
#define IM_OUTPUT_DISPLAY( S ) { S, &im__output_display, im__displayprint }
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#define IM_INPUT_GVALUE( S ) { S, &im__input_gvalue, NULL }
#define IM_OUTPUT_GVALUE( S ) { S, &im__output_gvalue, im__gprint }
/* Add a plug-in package.
*/
im_package *im_load_plugin( const char *name );
int im_load_plugins( const char *fmt, ... )
__attribute__((format(printf, 1, 2)));
/* Close all plug-ins.
*/
int im_close_plugins( void );
/* Loop over all loaded packages.
*/
void *im_map_packages( VSListMap2Fn fn, void *a );
/* Convenience functions for finding packages, functions, etc.
*/
im_function *im_find_function( const char *name );
im_package *im_find_package( const char *name );
im_package *im_package_of_function( const char *name );
/* Allocate space for, and free im_object argument lists.
*/
int im_free_vargv( im_function *fn, im_object *vargv );
int im_allocate_vargv( im_function *fn, im_object *vargv );
/* Run a VIPS command by name.
*/
int im_run_command( char *name, int argc, char **argv );
#ifdef __cplusplus
}
#endif /*__cplusplus*/
#endif /*IM_DISPATCH_H*/