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#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: clrmap.c (Color Map)
* Purpose: Set up the cell storemap XColor array
* Subroutine: make_cellstore_from_tables() returns: void
* Subroutine: make_cellstore_from_cellmaps() returns: void
* Subroutine: make_cellmap_from_table() returns: void
* Xlib calls: none
* Copyright: 1989 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} Michael VanHilst initial version 16 May 1989
* {n} <who> -- <does what> -- <when>
*/
#include <stdio.h> /* stderr, NULL, etc. */
#include <math.h> /* define pow */
#include <X11/Xlib.h> /* X window stuff */
#include <X11/Xutil.h> /* X window manager stuff */
#include "hfiles/color.h" /* color structs */
#include "hfiles/define.h" /* INTERP, INCSZ, and more */
/*
* Subroutine: make_cellstore_from_table
* Purpose: Fill the color map according to the color vertex tables
*/
void make_cellstore_from_tables ( color )
struct colorRec *color;
{
void make_cellmap_from_table(), make_cellstore_from_cellmaps();
make_cellmap_from_table(&color->ctable.red);
make_cellmap_from_table(&color->ctable.green);
make_cellmap_from_table(&color->ctable.blue);
make_cellstore_from_cellmaps(color);
}
/*
* Subroutine: make_cellstore_from_cellmaps
* Purpose: Fill XColor storemap from individual cellmaps
*/
void make_cellstore_from_cellmaps ( color )
struct colorRec *color;
{
double gamma;
double *cellmap;
double *gammamap;
register int i;
int ncolors;
XColor *cellstore;
cellstore = color->cellstore;
ncolors = color->ncolors;
cellmap = color->ctable.red.cellmap;
if( color->ctable.red.do_gamma ) {
gammamap = color->ctable.red.gammamap;
gamma = 1.0 / color->ctable.red.gamma;
for( i=0; i<ncolors; i++ )
cellstore[i].red = (unsigned short)
(65535.0 * (gammamap[i] = pow(cellmap[i], gamma)));
} else {
for( i=0; i<ncolors; i++ )
cellstore[i].red = (unsigned short)(cellmap[i] * 65535.0);
}
cellmap = color->ctable.green.cellmap;
if( color->ctable.green.do_gamma ) {
gammamap = color->ctable.green.gammamap;
gamma = 1.0 / color->ctable.green.gamma;
for( i=0; i<ncolors; i++ )
cellstore[i].green = (unsigned short)
(65535.0 * (gammamap[i] = pow(cellmap[i], gamma)));
} else {
for( i=0; i<ncolors; i++ )
cellstore[i].green = (unsigned short)(cellmap[i] * 65535.0);
}
cellmap = color->ctable.blue.cellmap;
if( color->ctable.blue.do_gamma ) {
gammamap = color->ctable.blue.gammamap;
gamma = 1.0 / color->ctable.blue.gamma;
for( i=0; i<ncolors; i++ )
cellstore[i].blue = (unsigned short)
(65535.0 * (gammamap[i] = pow(cellmap[i], gamma)));
} else {
for( i=0; i<ncolors; i++ )
cellstore[i].blue = (unsigned short)(cellmap[i] * 65535.0);
}
}
/*
* Subroutine: make_cellmap_from_table
* Purpose: Fill cellstore values based on table values
* Method: Set map values using interpolated ramps between map entries
*/
void make_cellmap_from_table ( table )
struct subtableRec *table;
{
double cell_factor;
double level_last;
double level_next;
double start_intensity; /* l: intensity at start cell */
double intensity_inc; /* l: change in intensity between cells */
double intensity_last;
double intensity_next;
double *cellmap; /* l: intensity by cell array */
int start_cell, stop_cell; /* l: cells at ends of ramp function */
int table_cnt;
int map_sz;
int table_i, map_i;
/* initialization phase */
table_cnt = table->vertex_cnt;
cellmap = table->cellmap;
map_sz = table->map_sz;
cell_factor = (double)(map_sz - 1);
table_i = 0;
while( (table->cell_level[table_i] < 0.0) && (++table_i < table_cnt) );
if( table_i >= table_cnt ) {
/* entire table is below 0.0: set entire map with last intensity */
start_intensity = table->intensity[table_cnt - 1];
for( map_i=0; map_i<map_sz; map_i++ )
cellmap[map_i] = start_intensity;
return;
} else if( table_i > 0 ) {
/* table extends partially below 0.0 */
level_last = table->cell_level[table_i - 1];
intensity_last = table->intensity[table_i - 1];
} else {
/* table starts at or above 0.0 */
level_last = 0.0;
intensity_last = table->intensity[table_i];
}
/* middle phase: run through map or table */
start_cell = 0;
do {
level_next = table->cell_level[table_i];
intensity_next = table->intensity[table_i];
stop_cell = (int)(level_next * cell_factor);
if( stop_cell >= map_sz )
/* stop at end of map if there */
stop_cell = map_sz - 1;
if( stop_cell >= start_cell ) {
/* if levels traverse any map cells, set them */
start_intensity =
INTERP(level_last, ((double)start_cell)/cell_factor, level_next,
intensity_last, intensity_next);
if( stop_cell == start_cell ) {
/* if only one cell is traversed, set it */
cellmap[start_cell] = start_intensity;
} else {
intensity_inc = INCSZ(level_last, level_next,
intensity_last, intensity_next, cell_factor);
for( map_i=start_cell; map_i<=stop_cell; map_i++ ) {
cellmap[map_i] = start_intensity;
start_intensity += intensity_inc;
}
/* check for slight over-step at end */
if( cellmap[stop_cell] < 0.0 )
cellmap[stop_cell] = 0.0;
else if( cellmap[stop_cell] > 1.0 )
cellmap[stop_cell] = 1.0;
}
start_cell = stop_cell + 1;
}
level_last = level_next;
intensity_last = intensity_next;
} while( (level_last < 1.0) && (++table_i < table_cnt) );
/* completion phase */
if( start_cell < map_sz ) {
/* table ended before 1.0 */
for( map_i=start_cell; map_i<map_sz; map_i++ )
cellmap[map_i] = intensity_last;
}
}
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