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include <error.h>
include <ctype.h>
include "export.h"
include "exfcn.h"
define DEBUG false
# EX_PREPROCESS - Some of the output functions aren't really applied to
# each line in the image (which is how the expressions are evaluated) but
# just define some feature of the whole output image. We'll strip out
# those functions here and set a flag so that the expression evaluation
# code doesn't have to see them.
procedure ex_preprocess (ex, expr)
pointer ex #i task struct pointer
char expr[ARB] #i input expression strings
char expstr[SZ_EXPSTR]
int ip, pp, last_ip, explen
char func[SZ_FNAME]
bool saw_output_func
int strlen(), strdic(), nowhite()
errchk ex_pp_setcmap, ex_pp_psdpi
errchk ex_cnt_parens, ex_pp_psscale
begin
# Strip out any whitespace chars.
call aclrc (expstr, SZ_EXPSTR)
ip = nowhite (expr, expstr, SZ_EXPSTR)
# Do a quick syntax check.
iferr (call ex_cnt_parens (expstr))
call erract (EA_FATAL)
# Only some functions may be nested, loop until we're forced to break.
# The functions have a precedence such that "special functions"
# may have as arguments "output functions". Below that are "scaling
# functions" and "builtin functions" that are evaluated for each image
# line. Functions w/in the same class may/may not call each other
# where it makes sense, we check for that here.
#
# The precedence order is:
#
# CMAP, SETCMAP, PSDPI, PSSCALE
# BAND, LINE, FLIPX, FLIPY
# ZSCALE, GRAY, BSCALE, GAMMA
# builtin functions
if (DEBUG) { call eprintf("preproc: str=`%s'\n");call pargstr(expstr) }
saw_output_func = false
for (ip = 1 ; expstr[ip] == '(' ; ip = ip + 1)
;
last_ip = 1
explen = strlen (expstr)
repeat {
# Get the function name.
pp = 1
call aclrc (func, SZ_FNAME)
while (expstr[ip] != '(' && expstr[ip] != EOS) {
func[pp] = expstr[ip]
ip = ip + 1
pp = pp + 1
}
func[pp+1] = EOS
if (expstr[ip] == EOS) {
call strcpy (expstr[last_ip], expr, SZ_EXPSTR)
return
}
if (DEBUG) { call eprintf("\tfunc=`%s'\n");call pargstr(func) }
# Update pointer into string past '('.
ip = ip + 1
switch (strdic (func, func, SZ_FNAME, OB_FUNCTIONS)) {
case CMAP:
if (EX_NEXPR(ex) > 1)
call error (4,
"cmap() func allowed only in single expression")
if (saw_output_func)
call error (5,
"Function cmap() may not be nested in output func.")
EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_MKCMAP)
case SETCMAP:
if (EX_NEXPR(ex) > 1)
call error (4,
"setcmap() func allowed only in single expression")
if (saw_output_func)
call error (5,
"Function setcmap(0 may not be nested in output func.")
EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_CMAP)
iferr (call ex_pp_setcmap (ex, expstr[ip]))
call erract (EA_FATAL)
last_ip = ip
explen = strlen (expstr)
next
case PSDPI:
if (EX_NEXPR(ex) > 1)
call error (4,
"psdpi() func allowed only in single expression")
if (saw_output_func)
call error (5,
"Function psdpi() may not be nested in output func.")
iferr (call ex_pp_psdpi (ex, expstr[ip]))
call erract (EA_FATAL)
last_ip = ip
explen = strlen (expstr)
next
case PSSCALE:
if (EX_NEXPR(ex) > 1)
call error (4,
"psscale() func allowed only in single expression")
if (saw_output_func)
call error (5,
"Function psscale() may not be nested in output func.")
iferr (call ex_pp_psscale (ex, expstr[ip]))
call erract (EA_FATAL)
last_ip = ip
explen = strlen (expstr)
next
case BAND:
saw_output_func = true
EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_BAND)
case LINE:
saw_output_func = true
EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_LINE)
case FLIPX:
saw_output_func = true
EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_FLIPX)
case FLIPY:
saw_output_func = true
EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_FLIPY)
default:
# No special function seen so just punt.
break
}
last_ip = ip # update string ptr
if (expstr[explen] != ')')
call error (5,
"Malformed expression, expecting ')' as last char")
expstr[explen] = EOS # remove trailing right paren
}
# Copy expression from current ip to begining of buffer.
call strcpy (expstr[last_ip], expr, SZ_EXPSTR)
if (DEBUG) { call eprintf("\tfixed exp =`%s'\n");call pargstr(expr) }
end
# EX_PP_SETCMAP - Process the SETCMAP special function.
procedure ex_pp_setcmap (ex, expstr)
pointer ex #i task struct pointer
char expstr[ARB] #i expression string
pointer sp, cm, cmap
int ip, lp # string pointers
int tp, i # where to trim the string
int ctor()
bool streq()
include "cmaps.inc"
begin
call smark (sp)
call salloc (cm, SZ_FNAME, TY_CHAR)
call aclrc (Memc[cm], SZ_FNAME)
if (DEBUG) { call eprintf("\t\texp=`%s'\n");call pargstr(expstr)}
# Skip ahead to a quote char single or double) indicating colormap
# name, we also stop at another non-blank char incase they didn't
# use quotes. If we find a comma, back up one so it's handled below.
ip = 1
while (expstr[ip] != EOS &&
expstr[ip] != '"' &&
expstr[ip] != '\'') {
if (expstr[ip] == '@')
for (ip=ip+2; expstr[ip] != '"'; ip=ip+1)
;
ip = ip + 1
}
tp = ip - 1
if (expstr[ip+1] == '"' || (expstr[ip+1]==' ' && expstr[ip+2]=='"') ||
expstr[ip+1] == '\'' || (expstr[ip+1]==' ' && expstr[ip+2]=='\'')) {
# No colormap file specified, assume it's a greyscale.
call strcpy ("greyscale", CMAPFILE(ex), SZ_FNAME)
ip = ip + 1
} else {
# Get colormap name and put it in the task struct.
ip = ip + 1
lp = 0
repeat {
Memc[cm+lp] = expstr[ip]
lp = lp + 1
ip = ip + 1
} until (expstr[ip] == EOS || expstr[ip] == '"' ||
expstr[ip] == '\'')
call strcpy (Memc[cm], CMAPFILE(ex), SZ_FNAME)
}
# Allocate the colormap pointer and read the colormap.
iferr (call calloc (EX_CMAP(ex), 3*CMAP_SIZE, TY_CHAR))
call error (0, "Error allocating colormap pointer.")
call ex_read_cmap (ex, CMAPFILE(ex))
# Get optional brightness and contrast values.
ip = ip + 1
if (expstr[ip] == ',') {
ip = ip + 1
if (ctor (expstr, ip, EX_BRIGHTNESS(ex)) == 0)
call error (5, "cannot interpret brightness value")
ip = ip + 1
if (ctor (expstr, ip, EX_CONTRAST(ex)) == 0)
call error (5, "cannot interpret contrast value")
# Don't scale the overlay colors in colormap.
if (streq(CMAPFILE(ex), "overlay")) {
cmap = EX_CMAP(ex)
call ex_scale_cmap (cmap, 200,
EX_BRIGHTNESS(ex), EX_CONTRAST(ex))
# Patch up the static overlay colors.
do i = 201, 255 {
Memc[cmap+(EX_RED*CMAP_SIZE)+i] = overlay[i*3+1]
Memc[cmap+(EX_GREEN*CMAP_SIZE)+i] = overlay[i*3+2]
Memc[cmap+(EX_BLUE*CMAP_SIZE)+i] = overlay[i*3+3]
}
} else {
call ex_scale_cmap (EX_CMAP(ex), EX_NCOLORS(ex),
EX_BRIGHTNESS(ex), EX_CONTRAST(ex))
}
}
# We should be at the end of the string now.
if (expstr[ip] != ')')
call error (5, "Malformed expression, expecting ')' as last char")
if (DEBUG) {
call eprintf("\t\tcmfile=`%s' brightness=%g contrast=%g\n")
call pargstr(CMAPFILE(ex));call pargr(EX_BRIGHTNESS(ex))
call pargr(EX_CONTRAST(ex))
}
# Now trim the expression string.
expstr[tp] = EOS
call sfree (sp)
end
# EX_PP_PSDPI - Process the PSDPI special function.
procedure ex_pp_psdpi (ex, expstr)
pointer ex #i task struct pointer
char expstr[ARB] #i expression string
int ip, tp
int ctor(), strlen()
begin
if (DEBUG) { call eprintf("\t\texp=`%s'\n");call pargstr(expstr)}
# The last argument is required to be the dpi resolution so pull
# it out.
ip = strlen (expstr)
while (expstr[ip] != ',') {
ip = ip - 1
if (expstr[ip] == ')' || IS_ALPHA(expstr[ip]))
call error (6, "syntax error")
}
tp = ip
ip = ip + 1
if (ctor(expstr,ip,EX_PSDPI(ex)) == 0)
call error (5, "cannot interpret EPS dpi value")
# Now trim the expression string.
expstr[tp] = EOS
end
# EX_PP_PSSCALE - Process the PSSCALE special function.
procedure ex_pp_psscale (ex, expstr)
pointer ex #i task struct pointer
char expstr[ARB] #i expression string
int ip, tp
int ctor(), strlen()
begin
if (DEBUG) { call eprintf("\t\texp=`%s'\n");call pargstr(expstr)}
# The last argument is required to be the dpi resolution so pull
# it out.
ip = strlen (expstr)
while (expstr[ip] != ',') {
ip = ip - 1
if (expstr[ip] == ')' || IS_ALPHA(expstr[ip]))
call error (6, "syntax error")
}
tp = ip
ip = ip + 1
if (ctor(expstr,ip,EX_PSSCALE(ex)) == 0)
call error (5, "cannot interpret EPS scale value")
# Now trim the expression string.
expstr[tp] = EOS
end
# EX_CNT_PARENS - Count the number of parentheses in the expression string.
procedure ex_cnt_parens (expr)
char expr[ARB] #i outbands expression strinf
int ip, plev
begin
ip = 1
plev = 0
while (expr[ip] != EOS) {
if (expr[ip] == '(') plev = plev + 1
if (expr[ip] == ')') plev = plev - 1
ip = ip + 1
}
if (plev > 0)
call error (5, "Missing right paren in `outbands' expression.")
if (plev < 0)
call error (5, "Missing left paren in `outbands' expression.")
end
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