Continuing implementation of rpn_if, adding default if functions implementation

Makefile

@@ -21,7 +21,7 @@ PYTHON_LDFLAGS=-shared  -fPIC `$(PYTHON_CONFIG) --libs` `$(PYTHON_CONFIG) --ldfl
 
 all: .deps pyrpn.so
 
-pyrpn.so: python_pyrpn.o python_rpnexpr.o rpn_lib.o rpn_jit.o rpn_parse.o rpn_mutation.o rpn_if.o
+pyrpn.so: python_pyrpn.o python_rpnexpr.o rpn_lib.o rpn_jit.o rpn_parse.o rpn_mutation.o rpn_if.o rpn_if_default.o
 	$(LD) $(LDFLAGS) $(PYTHON_LDFLAGS) -o $@ $^
 
 python_pyrpn.o: python_pyrpn.c python_rpnexpr.h python_rpnexpr.o rpn_jit.o
@@ -42,6 +42,9 @@ rpn_mutation.o: rpn_mutation.c rpn_mutation.h rpn_parse.o
 rpn_if.o: rpn_if.c rpn_if.h rpn_jit.o
 	$(CC) $(CFLAGS) -c $<
 
+rpn_if_default.o: rpn_if_default.c rpn_if_default.h rpn_if.o
+	$(CC) $(CFLAGS) -c $<
+
 rpn_lib.o: rpn_lib.asm rpn_lib.h
 	$(NASM) $(NASMCFLAGS) -o $@ $<
 

python_rpnexpr.h

@@ -92,6 +92,7 @@ PyObject* rpnexpr_new(PyTypeObject *subtype, PyObject *args, PyObject* kwds);
  * @ingroup python_type
  */
 int rpnexpr_init(PyObject *self, PyObject *args, PyObject *kwds);
+
 /**@brief RPNExpr __del__ method 
  * @param self RPNExpr instance
  * @ingroup python_type

rpn_if.c

@@ -18,81 +18,7 @@
  */
 #include "rpn_if.h"
 
-rpn_if_t* rpn_if_new(size_t mem_sz, rpn_if_transfo_t *if2rpn,
-	rpn_if_transfo_t *rpn2if, rpn_expr_t *rpn)
-{
-	rpn_if_t *res;
-	if(mem_sz != 0)
-	{
-		if((if2rpn->mem_sz != 0 && if2rpn->mem_sz != mem_sz) ||
-			(rpn2if->mem_sz != 0 && rpn2if->mem_sz != mem_sz))
-		{
-			errno = EINVAL;
-			return NULL;
-		}
-	}
-	else
-	{
-		if(if2rpn->mem_sz == 0 && rpn2if->mem_sz == 0)
-		{
-			errno = EINVAL;
-			return NULL;
-		}
-		if(if2rpn->mem_sz != rpn2if->mem_sz && if2rpn->mem_sz != 0 &&
-			rpn2if->mem_sz != 0)
-		{
-			errno = EINVAL;
-			return NULL;
-		}
-		mem_sz = if2rpn->mem_sz != 0?if2rpn->mem_sz:rpn2if->mem_sz;
-	}
-	if(if2rpn->data_sz != rpn2if->data_sz || if2rpn->data_sz == 0)
-	{
-		errno = EINVAL;
-		return NULL;
-	}
-	res = _rpn_if_new(mem_sz, if2rpn->argc, rpn2if->argc, rpn2if->data_sz);
-	if(!res)
-	{
-		return NULL;
-	}
-	res->if2rpn = if2rpn->if2rpn;
-	res->rpn2if = rpn2if->rpn2if;
-	res->rpn = rpn;
-	return res;
-}
-
-void rpn_if_free(rpn_if_t* rif)
-{
-	size_t i;
-	for(i=0; i<rif->rpn_sz; i++)
-	{
-		rpn_expr_close(&(rif->rpn[i]));
-	}
-	free(rif->rpn);
-	free(rif->rpn_res);
-	munmap(rif->mem, rif->mem_sz);
-	free(rif);
-}
-
-int rpn_if_rpn_upd(rpn_if_t *rif, rpn_tokenized_t *rpns)
-{
-	return rpn_if_rpn_upd_rng(rif, rpns, rif->rpn_sz, 0);
-}
-
-int rpn_if_rpn_upd_rng(rpn_if_t *rif, rpn_tokenized_t *rpns, size_t sz,
-	size_t offset)
-{
-	size_t i;
-	for(i=offset; i<offset+sz; i++)
-	{
-		/**@todo continue implementation */
-	}
-	return 0;
-}
-
-rpn_if_t* _rpn_if_new(size_t mem_sz, size_t rpn_argc, size_t rpn_count, size_t
-	value_sz)
+rpn_if_t* rpn_if_new(const rpn_if_param_t *params, rpn_expr_t *rpn)
 {
 	rpn_if_t *res;
 	int err;
@@ -103,25 +29,24 @@ rpn_if_t* _rpn_if_new(size_t mem_sz, size_t rpn_argc, size_t rpn_count, size_t
 		goto error;
 	}
 	
-	res->rpn_sz = rpn_count;
-	res->rpn_argc = rpn_argc;
-	res->mem_sz = mem_sz;
-	res->value_sz = value_sz;
+	memcpy(&res->params, params, sizeof(rpn_if_param_t));
 
-	res->mem = mmap(NULL, mem_sz, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0);
+	res->mem = mmap(NULL, params->mem_sz, PROT_READ|PROT_WRITE, MAP_ANON,
+		-1, 0);
 	if(res->mem == (void*)-1)
 	{
 		goto mmap_err;
 	}
 
-	res->rpn_res = malloc(sizeof(unsigned long) * (rpn_count +rpn_argc));
+	res->rpn_res = malloc(sizeof(rpn_value_t) *
+		(params->rpn_sz + params->rpn_argc));
 	if(!res->rpn_res)
 	{
 		goto rpn_malloc_err;
 	}
-	res->rpn_args = &(res->rpn_res[res->rpn_sz]);
+	res->rpn_args = &(res->rpn_res[params->rpn_sz]);
 
-	res->rpn = malloc(sizeof(rpn_expr_t) * res->rpn_sz);
+	res->rpn = malloc(sizeof(rpn_expr_t) * params->rpn_sz);
 	if(!res->rpn)
 	{
 		goto rpn_expr_err;
@@ -134,7 +59,7 @@ rpn_if_t* _rpn_if_new(size_t mem_sz, size_t rpn_argc, size_t rpn_count, size_t
 		free(res->rpn_res);
 	rpn_malloc_err:
 		err = errno;
-		munmap(res->mem, mem_sz);
+		munmap(res->mem, params->mem_sz);
 	mmap_err:
 		err = errno;
 		free(res);
@@ -143,3 +68,46 @@ rpn_if_t* _rpn_if_new(size_t mem_sz, size_t rpn_argc, size_t rpn_count, size_t
 		errno = err;
 		return NULL;
 }
+
+void rpn_if_free(rpn_if_t* rif)
+{
+	size_t i;
+	for(i=0; i<rif->params.rpn_sz; i++)
+	{
+		rpn_expr_close(&(rif->rpn[i]));
+	}
+	free(rif->rpn);
+	free(rif->rpn_res);
+	munmap(rif->mem, rif->params.mem_sz);
+	free(rif);
+}
+
+size_t rpn_if_step(rpn_if_t *rif, size_t pos)
+{
+	size_t i;
+	size_t newpos;
+	rif->params.arg_f(rif, pos, rif->rpn_args);
+	for(i=0; i<rif->params.rpn_sz; i++)
+	{
+		rif->rpn_res[i] = rpn_expr_eval(&(rif->rpn[i]), rif->rpn_args);
+	}
+	rif->params.res_f(rif, &newpos, rif->rpn_res);
+	return newpos;
+}
+
+int rpn_if_rpn_upd(rpn_if_t *rif, rpn_tokenized_t *rpns)
+{
+	return rpn_if_rpn_upd_rng(rif, rpns, rif->params.rpn_sz, 0);
+}
+
+int rpn_if_rpn_upd_rng(rpn_if_t *rif, rpn_tokenized_t *rpns, size_t sz,
+	size_t offset)
+{
+	size_t i;
+	for(i=offset; i<offset+sz; i++)
+	{
+		/**@todo continue implementation */
+	}
+	return 0;
+}
+

rpn_if.h

@@ -34,120 +34,69 @@
  * For more details about IF see dedicated page : @ref doc_ifs_if
  */
 
-typedef void* rpn_if_arg_t;
-typedef unsigned long rpn_arg_t;
+/**@brief Shortcut for struct @ref rpn_if_s */
 typedef struct rpn_if_s rpn_if_t;
-typedef struct rpn_if_res_s rpn_if_res_t;
-typedef struct rpn_if_state_s rpn_if_state_t;
-typedef struct rpn_if_transfo_s rpn_if_transfo_t;
-typedef enum rpn_if_transfo_type_e rpn_if_transfo_type_t;
-/**@brief IF state to RPN arguments transformation */
-typedef void (*if2rpn_f)(rpn_if_t *rif, rpn_if_state_t, rpn_arg_t*);
-/**@brief RPN arguments to IF state transformation */
-typedef rpn_if_res_t (*rpn2if_f)(rpn_if_t *rif, rpn_arg_t, rpn_if_state_t);
-
-/**@brief IF state
- *
- * Will always be something like :
- * - memory adress/offset/index
- * - value
- */
-struct rpn_if_state_s
-{
-	/**@brief Data address */
-	size_t i;
-	/**@brief Data value(s) */
-	void *val;
-};
-
-/**@brief Indicate function type for @ref rpn_if_transfo_s */
-enum rpn_if_transfo_type_e
-{
-	/**@brief No transformation
-	 *
-	 * Default behavior is to copy data in args directly assuming
-	 * argc * sizeof(unsigned long) =  data_sz */
-	RPN_f_null,
-	/**@brief Transform RPN result into data */
-	RPN_f_rpn2if,
-	/**@brief Transform data into RPN result */
-	RPN_f_if2rpn
-};
-/**@brief Represent an IF transformation function
- *
- * Can transform data into arguments or arguments into data, depending
- * on function type.
- */
-struct rpn_if_transfo_s
-{
-	/**@brief Function pointer type
-	 * @note optionnal, for type checking
-	 */
-	rpn_if_transfo_type_t type;
-	/**@brief Data size (a @ref rpn_if_s::mem item ) in bytes */
-	size_t data_sz;
-	/**@brief Memory size in byte */
-	size_t mem_sz;
-	/**@brief RPN arg/result size
-	 *
-	 * - if type is RPN_if2rpn argc is the rpn expression argc
-	 * - if type is RPN_rpn2if argc is the rpn expression count (results
-	 * count)
-	 */
-	size_t argc;
-	union {
-		/**@brief IF state to RPN arguments transformation */
-		if2rpn_f if2rpn;
-		/**@brief RPN arguments to IF state transformation */
-		rpn2if_f rpn2if;
-	};
-};
+/**@brief Shortcut for struct @ref rpn_if_param_s */
+typedef struct rpn_if_param_s rpn_if_param_t;
 
-/**@brief Generic Iterated function implementation */
-struct rpn_if_s
+/**@brief Stores IF parameters and transformations function pointers */
+struct rpn_if_param_s
 {
-	/**@brief Memory map in wich data are fetch & stored */
-	void *mem;
-	/**@brief Memory map size in bytes */
+	/**@brief Memory map size in items */
 	size_t mem_sz;
 	/**@brief Size of a memory item */
 	size_t value_sz;
-
-	/**@brief IF last position + value buffer */
-	rpn_if_state_t state;
-	/**@brief RPN expression(s) result(s) buffer */
-	unsigned long *rpn_res;
-	/**@brief Arguments given to RPN expression(s) buffer */
-	rpn_arg_t *rpn_args;
+	/**@brief RPN expression count */
+	size_t rpn_sz;
 	/**@brief Number of arguments expected by RPN expressions */
 	size_t rpn_argc;
 
-	/**@brief RPN expression(s) pointer(s) */
-	rpn_expr_t *rpn;
-	/**@brief RPN expression count */
-	size_t rpn_sz;
+	/**@brief Position to RPN argument transformation */
+	int (*arg_f)(rpn_if_t *rif, size_t pos, rpn_value_t *args);
+	/**@brief RPN results to data and position transformation
+	 * @note set memory maps with converted data */
+	int (*res_f)(rpn_if_t *rif, size_t *pos,
+		rpn_value_t *data);
 
-	/**@brief IF state to RPN arguments transformation */
-	if2rpn_f if2rpn;
-	/**@brief RPN arguments to IF state transformation */
-	rpn2if_f rpn2if;
+	void *data;
+};
 
+/**@brief Generic Iterated function implementation */
+struct rpn_if_s
+{
+	/**@brief IF parameters */
+	rpn_if_param_t params;
+	/**@brief RPN expression(s) pointer(s) */
+	rpn_expr_t *rpn;
+	/**@brief RPN expression(s) result(s) buffer */
+	rpn_value_t *rpn_res;
+	/**@brief Arguments given to RPN expression(s) buffer */
+	rpn_value_t *rpn_args;
+	/**@brief Memory map in wich data are fetch & stored */
+	rpn_value_t *mem;
 };
 
+#define rpn_if_getitem(rif, pos) (rif->mem + (rif->params.value_sz * pos))
+
 /**@brief Alloc a new @ref rpn_if_s from two transformation functions
- * @param if2rpn informations about data to rpn args transformation
- * @param rpn2if informations about rpn args to data transformation 
- * @param rpn list of RPN expresions ( must be of rpn2if->argc size !!!)
+ * @param params IF parameters
+ * @param rpn list of RPN expresions of params->rpn_sz size
  * @return A pointer on an allocated @ref rpn_if_s
  */
-rpn_if_t* rpn_if_new(size_t mem_sz, rpn_if_transfo_t *if2rpn,
-	rpn_if_transfo_t *rpn2if, rpn_expr_t *rpn);
+rpn_if_t* rpn_if_new(const rpn_if_param_t *params, rpn_expr_t *rpn);
 
-/**@brief Deallocate an @ref rpn_ifs_s and close associated @ref rpn_expr_s
+/**@brief Deallocate an @ref rpn_ifs_s and its ressources and close associated 
+ * @ref rpn_expr_s
  * @param rif The IF to deallocate
  */
 void rpn_if_free(rpn_if_t *rif);
 
+/**@brief Run an IF
+ * @param rif Pointer on IF
+ * @param pos Input position
+ * @return new position
+ */
+size_t rpn_if_step(rpn_if_t *rif, size_t pos);
 
 /**@brief Update all RPN expressions
  * @param rif The concerned IF
@@ -156,6 +105,7 @@ void rpn_if_free(rpn_if_t *rif);
  * @note Shortcut for @ref rpn_if_rpn_upd_rng(rif, rpns, rif->rpn_sz, 0);
  */
 int rpn_if_rpn_upd(rpn_if_t *rif, rpn_tokenized_t *rpns);
+
 /**@brief Update a range of RPN expressions
  * @param rif The concerned IF
  * @param rpn A list of tokenized expressions

rpn_if_default.c

@@ -0,0 +1,233 @@
+#include "rpn_if_default.h"
+
+
+int rpn_if_argf_default(rpn_if_t *rif, size_t pos, rpn_value_t *args)
+{
+	size_t cur_arg, i, rgb_imax;
+	rpn_if_default_data_t *data;
+	rpn_value_t *values;
+
+	data = (rpn_if_default_data_t*)rif->params.data;
+
+	switch(data->pos_flag)
+	{
+		case RPN_IF_POSITION_LINEAR:
+			rpn_if_argf_linear(rif, pos, args);
+			cur_arg = 1;
+			break;
+		case RPN_IF_POSITION_XY:
+			rpn_if_argf_xy(rif, pos, args);
+			cur_arg = 2;
+			break;
+		case RPN_IF_POSITION_XDIM:
+			rpn_if_argf_xdim(rif, pos, args);
+			cur_arg = *(data->size_lim);
+			break;
+	}
+	if(cur_arg >= rif->params.rpn_argc)
+	{
+		/* Too many arguments for given rif !! */
+		return -1;
+	}
+	rgb_imax = 4; /* rgba */
+	values = rpn_if_getitem(rif, pos);
+	switch(data->res_flag)
+	{
+		case RPN_IF_RES_BOOL:
+			args[cur_arg] = values[0]?1:0;
+			break;
+		case RPN_IF_RES_CONST:
+		case RPN_IF_RES_COUNT:
+			args[cur_arg] = *values;
+			break;
+		case RPN_IF_RES_RGB:
+			rgb_imax = 3;
+		case RPN_IF_RES_CONST_RGBA:
+		case RPN_IF_RES_RGBA:
+			for(i=0; i<rgb_imax; i++)
+			{
+				args[cur_arg+i] = values[i];
+			}
+			break;
+		case RPN_IF_RES_XFUN:
+			for(i=0; i < rif->params.rpn_sz - cur_arg; i++)
+			{
+				args[cur_arg+i] = values[i];
+			}
+			break;
+		default:
+			return -1;
+	}
+	return -1;
+}
+
+int rpn_if_resf_default(rpn_if_t *rif, size_t *pos, rpn_value_t *data);
+
+int rpn_if_argf_linear(rpn_if_t *rif, size_t pos, rpn_value_t *args)
+{
+	rpn_if_default_data_t *data;
+	data = (rpn_if_default_data_t*)rif->params.data;
+	if(data->size_lim && pos >= *data->size_lim)
+	{
+		if(data->pos_flag & RPN_IF_POSITION_OF_ERR)
+		{
+			return -1;
+		}
+		pos %= *(data->size_lim);
+	}
+	args[0] = pos;
+	return 0;
+}
+
+int rpn_if_resf_linear(rpn_if_t *rif, size_t *pos, rpn_value_t *_data)
+{
+	rpn_if_default_data_t *data;
+	size_t res;
+	data = (rpn_if_default_data_t*)rif->params.data;
+	res = rif->rpn_res[0];
+	if(data->size_lim && res >= *data->size_lim)
+	{
+		if(data->pos_flag & RPN_IF_POSITION_OF_ERR)
+		{
+			return -1;
+		}
+		res %= *(data->size_lim);
+	}
+	*pos = res;
+	return 0;
+}
+
+int rpn_if_argf_xy(rpn_if_t *rif, size_t pos, rpn_value_t *args)
+{
+	rpn_if_default_data_t *data;
+
+	data = (rpn_if_default_data_t*)rif->params.data;
+	if(!data->size_lim)
+	{
+		return -1;
+	}
+	args[0] = pos % data->size_lim[0];
+	args[1] = pos / data->size_lim[0];
+	if(args[1] > data->size_lim[1])
+	{
+		if(data->pos_flag & RPN_IF_POSITION_OF_ERR)
+		{
+			return -1;
+		}
+		args[1] %= data->size_lim[1];
+	}
+	return 0;
+}
+
+int rpn_if_resf_xy(rpn_if_t *rif, size_t *pos, rpn_value_t *_data)
+{
+	rpn_if_default_data_t *data;
+	size_t xy[2];
+
+	data = (rpn_if_default_data_t*)rif->params.data;
+	
+	xy[0] = rif->rpn_res[0];
+	xy[1] = rif->rpn_res[1];
+
+	if(!data->size_lim)
+	{
+		return -1;
+	}
+
+	if(xy[0] >= data->size_lim[0] || xy[1] >= data->size_lim[1])
+	{
+		if(data->pos_flag & RPN_IF_POSITION_OF_ERR)
+		{
+			return -1;
+		}
+		xy[0] %= data->size_lim[0];
+		xy[1] %= data->size_lim[1];
+	}
+	*pos = xy[0]+(xy[1]*data->size_lim[0]);
+	return 0;
+}
+
+int rpn_if_argf_xdim(rpn_if_t *rif, size_t pos, rpn_value_t *args)
+{
+	rpn_if_default_data_t *data;
+	size_t i, curdim_sz, curpos;
+
+	data = (rpn_if_default_data_t*)rif->params.data;
+
+	if(!data->size_lim)
+	{
+		return -1;
+	}
+	if(*(data->size_lim) < 1)
+	{
+		return -1;
+	}
+	/**@todo check if *(data->size_lim) overflow rif->params->rpn_argc */
+
+	curdim_sz = 1;
+	curpos = pos;
+	for(i=0; i<*(data->size_lim)-1; i++)
+	{
+		curdim_sz *= data->size_lim[i+1];
+		args[i] = curpos % curdim_sz;
+		curpos /= curdim_sz;
+	}
+	args[i] = curpos;
+	if(args[i] >= curdim_sz)
+	{
+		if(data->pos_flag && RPN_IF_POSITION_OF_ERR)
+		{
+			return -1;
+		}
+		args[i] %= curdim_sz;
+	}
+	return 0;
+}
+
+int rpn_if_resf_xdim(rpn_if_t *rif, size_t *pos, rpn_value_t *_data)
+{
+	rpn_if_default_data_t *data;
+	size_t i, res, cur, curlim, prevlim;
+
+	data = (rpn_if_default_data_t*)rif->params.data;
+	res = 0;
+	
+	if(!data->size_lim)
+	{
+		return -1;
+	}
+	if(*(data->size_lim) < 1)
+	{
+		return -1;
+	}
+	/**@todo check if *(data->size_lim) overflow rif->params->rpn_argc */
+
+	res = rif->rpn_res[0];
+	if(res >= data->size_lim[1])
+	{
+		if(data->pos_flag & RPN_IF_POSITION_OF_ERR)
+		{
+			return -1;
+		}
+		res %= data->size_lim[1];
+	}
+
+	for(i=1; i < *(data->size_lim); i++)
+	{
+		cur = rif->rpn_res[i];
+		prevlim = data->size_lim[i];
+		curlim = data->size_lim[i+1];
+		if(cur >= curlim)
+		{
+			if(data->pos_flag & RPN_IF_POSITION_OF_ERR)
+			{
+				return -1;
+			}
+			cur %= curlim;
+		}
+		res += cur * prevlim;
+	}
+	*pos = res;
+	return 0;
+}
+

rpn_if_default.h

@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2020 Weber Yann
+ * 
+ * This file is part of pyrpn.
+ * 
+ * pyrpn 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
+ * any later version.
+ * 
+ * pyrpn 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 pyrpn.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __rpn_if_default__h__
+#define __rpn_if_default__h__
+
+/**@file rpn_if_default.h Defines default IF
+ * @brief Default IF definitions
+ */
+/**@defgroup ifs_if_default Default functions
+ * @brief Simple iterated functions functions
+ */
+
+#include "config.h"
+#include "rpn_if.h"
+
+#define RPN_IF_POSITION_LINEAR 0 // One expr for position
+#define RPN_IF_POSITION_XY 1 // two expr for poisition
+#define RPN_IF_POSITION_XDIM 2 // X expr for position
+
+#define RPN_IF_POSITION_OF_LOOP 0 // Loop on position overflow
+#define RPN_IF_POSITION_OF_ERR 16 // Trigger error on position overflow
+
+#define RPN_IF_RES_BOOL 0 // Set to one when position occurs
+#define RPN_IF_RES_CONST 1 // Set to a constant value
+#define RPN_IF_RES_CONST_RGBA 2 // Set to a constant RGB using alpha channel
+#define RPN_IF_RES_COUNT 3 // Count number of time position occurs
+#define RPN_IF_RES_XFUN 4 // Set to result of rpn_expr
+#define RPN_IF_RES_RGB 5 // Set result to RGB color from rpn_expr
+#define RPN_IF_RES_RGBA 6 // Set result to RGB using alpha channel from rpn_expr
+
+typedef struct rpn_if_default_data_s rpn_if_default_data_t;
+
+/**@brief Stores default IF data
+ *
+ * Stores flags and size limit
+ */
+struct rpn_if_default_data_s
+{
+	short pos_flag;
+	short res_flag;
+	/**@brief Stores size limits given pos_flag
+	 *
+	 * @note If NULL no limit
+	 * - For @ref RPN_IF_POSITION_LINEAR size_lim is a single size_t
+	 * - For @ref RPN_IF_POSITION_XY size_lim is two size_t (height and width)
+	 * - For @ref RPN_IF_POSITION_XDIM *size_lim is the size of size_lim
+	 */
+	size_t *size_lim;
+
+	/**@brief Store constant values to set mem giver res_flag
+	 * - For @ref RPN_IF_CONST_RGBA const_val points on a single value
+	 * - For @ref RPN_IF_RES_CONST_RGBA const_val points on 4 values
+	 */
+	rpn_value_t *const_val;
+};
+
+int rpn_if_argf_default(rpn_if_t *rif, size_t pos, rpn_value_t *args);
+int rpn_if_resf_default(rpn_if_t *rif, size_t *pos, rpn_value_t *data);
+
+/**@brief Set the first expression argument from position
+ * @params rif Expressions
+ * @params pos Memory map offset
+ * @params args pointer on expressions arguments
+ * @note Other arguments are set using the generic @ref rpn_if_argf_default
+ * function
+ */
+int rpn_if_argf_linear(rpn_if_t *rif, size_t pos, rpn_value_t *args);
+/**@brief Transform 1st expression result to position 
+ * @params rif Expressions
+ * @params pos Pointer on resulting position in memory map
+ * @params data Pointer on resulting data
+ * @note Data from position fecth is done by generic @ref rpn_if_resf_default
+ * function
+ */
+int rpn_if_resf_linear(rpn_if_t *rif, size_t *pos, rpn_value_t *data);
+
+/**@brief Set the 1st & 2nd argument from position
+ * @params rif Expressions
+ * @params pos Memory map offset
+ * @params args pointer on expression arguments
+ * @note Other arguments are set using the generic @ref rpn_if_argf_default
+ * function
+ */
+int rpn_if_argf_xy(rpn_if_t *rif, size_t pos, rpn_value_t *args);
+/**@brief Transform 1st and 2nd result into a memory map's offset
+ * @params rif Expressions
+ * @param pos Memory map offset pointer
+ * @params data Pointer on resulting data
+ * @note Data from position fetch is done by generic @ref rpn_if_resf_default
+ * function
+ */
+int rpn_if_resf_xy(rpn_if_t *rif, size_t *pos, rpn_value_t *data);
+
+/**@brief Set X first arguments from position
+ * @params rif Expressions
+ * @params pos Memory map offset
+ * @params args Pointer on expression arguments
+ * @note Other arguments are set using the generic @ref rpn_if_argf_default
+ * function
+ */
+int rpn_if_argf_xdim(rpn_if_t *rif, size_t pos, rpn_value_t *args);
+/**@brief Transform X arguments into a memory map's offset
+ * @params rif Expressions
+ * @param pos Memory map offset pointer
+ * @param data Pointer on resulting data
+ * @note Data from position fetch is done by generic @ref rpn_if_resf_default
+ * function
+ */
+int rpn_if_resf_xdim(rpn_if_t *rif, size_t *pos, rpn_value_t *data);
+
+#endif