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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/***********************************************************************
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* Author: Philip Thompson ([email protected])
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* - convert from RADIANCE image file format to Xim and vice-versa.
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* Copyright (c) 1990, Massachusetts Institute of Technology
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* Philip R. Thompson ([email protected])
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* Computer Resource Laboratory (CRL)
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* Dept. of Architecture and Planning
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* M.I.T., Rm 9-526
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* Cambridge, MA 02139
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* This software and its documentation may be used, copied, modified,
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* and distributed for any purpose without fee, provided:
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* -- The above copyright notice appears in all copies.
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* -- This disclaimer appears in all source code copies.
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* -- The names of M.I.T. and the CRL are not used in advertising
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* or publicity pertaining to distribution of the software
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* without prior specific written permission from me or CRL.
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* I provide this software freely as a public service. It is NOT
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* public domain nor a commercial product, and therefore is not subject
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* to an an implied warranty of merchantability or fitness for a
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* particular purpose. I provide it as is, without warranty.
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* This software is furnished only on the basis that any party who
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* receives it indemnifies and holds harmless the parties who furnish
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* it against any claims, demands, or liabilities connected with using
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* it, furnishing it to others, or providing it to a third party.
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***********************************************************************/
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#if (!defined(lint) && !defined(SABER))
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static char radiance_rcsid[] =
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"$Header: /mit/phils/X/lib/RCS/radiance_io.c,v 1.2 90/09/10 14:37:21 phils Exp Locker: phils $";
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#endif
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#include <stdio.h>
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#include <math.h>
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#include <pwd.h>
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#include <sys/types.h>
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#ifdef SYSV
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#include <string.h>
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#else
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#include <strings.h>
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#include <sys/time.h>
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#endif
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/* XimHeader.h */
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/*
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* Author: Philip R. Thompson
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* Address: [email protected], 9-526
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* $Header: /mit/phils/X/RCS/XimHeader.h,v 1.11 90/08/09 20:48:33 phils Exp Locker: phils $
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* $Date: 90/08/09 20:48:33 $
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* $Source: /mit/phils/X/RCS/XimHeader.h,v $
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* Copyright (c) 1989, 1990 Massachusetts Institute of Technology
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* 1988, Philip R. Thompson ([email protected])
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* Computer Resource Laboratory (CRL)
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* Dept. of Architecture and Planning
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* M.I.T., Rm 9-526
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* Cambridge, MA 02139
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* This software and its documentation may be used, copied, modified,
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* and distributed for any purpose without fee, provided:
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* -- The above copyright notice appears in all copies.
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* -- This disclaimer appears in all source code copies.
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* -- The names of M.I.T. and the CRL are not used in advertising
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* or publicity pertaining to distribution of the software
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* without prior specific written permission from me or CRL.
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* I provide this software freely as a public service. It is NOT
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* public domain nor a commercial product, and therefore is not subject
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* to an an implied warranty of merchantability or fitness for a
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* particular purpose. I provide it as is, without warranty.
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*
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* This software is furnished only on the basis that any party who
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* receives it indemnifies and holds harmless the parties who furnish
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* it against any claims, demands, or liabilities connected with using
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* it, furnishing it to others, or providing it to a third party.
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*/
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#define IMAGE_VERSION 3
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#ifndef _BYTE
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typedef unsigned char byte;
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#define _BYTE 1
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#endif
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#include <sys/types.h>
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/* External ascii file format
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* Note: size of header should be 1024 (1K) bytes.
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*/
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typedef struct ImageHeader {
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char file_version[8]; /* header version */
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char header_size[8]; /* Size of file header in bytes (1024) */
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char image_width[8]; /* Width of the raster image */
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char image_height[8]; /* Height of the raster imgage */
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char num_colors[4]; /* Actual number of entries in c_map */
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char greyscale[2]; /* Flag if no c_map needed */
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char flag[2]; /* Not used */
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char num_channels[3]; /* 0 or 1 = pixmap, 3 = RG&B buffers */
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char bytes_per_line[5]; /* bytes per scanline */
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char num_pictures[4]; /* Number of pictures in file */
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char bits_per_channel[4]; /* usually 1 or 8 */
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char alpha_channel[4]; /* Alpha channel flag */
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char runlength[4]; /* Runlength encoded flag */
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char author[48]; /* Name of who made it */
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char date[32]; /* Date and time image was made */
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char program[16]; /* Program that created this file */
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char comment[96]; /* other viewing info. for this image */
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unsigned char c_map[256][3]; /* RGB values of the pixmap indices */
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} XimAsciiHeader;
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/* Internal binary format
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*/
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typedef struct Color {
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byte red, grn, blu, pixel;
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} Color;
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typedef struct XimImage {
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int width; /* width of the image in pixels */
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int height; /* height of the image in pixels */
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int bytes_line; /* bytes to hold one scanline */
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unsigned datasize; /* size of one channel of data */
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short nchannels; /* data channels per pixel, usually 1 or3 */
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short bits_channel; /* depth of a channel, usually 1 or 8 */
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byte *data; /* pixmap or red channel data */
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byte *grn_data; /* green channel data */
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byte *blu_data; /* blue channel data */
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byte *other; /* other (alpha) data */
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short ncolors; /* number of colors in the color table */
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Color *colors; /* colortable for pixmaps */
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short curr_pic, npics; /* current & total file number of images */
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unsigned alpha_flag: 1; /* alpha channel flag - "other" is used */
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unsigned grey_flag : 1; /* is pixmap grey scaled */
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unsigned packed_flag:1; /* is data packed in one chunk of memory */
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unsigned runlen_flag:1; /* is data compressed flag (not used) */
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unsigned : 0; /* future flags space and word alignment */
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char *author; /* author credit, copyright, etc */
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char *date; /* date image was made, grabbed, etc. */
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char *program; /* program used to make this */
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char *name; /* name of the image - usually filename */
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short ncomments; /* number of comments strings */
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char **comments; /* pointers to null terminated comments */
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char *offset; /* original offset in memory when packed */
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float gamcor; /* image storage gamma */
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float chroma_red[2]; /* x, y image chromacity coords */
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float chroma_grn[2];
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float chroma_blu[2];
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float chroma_wht[2];
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} XimImage;
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/* Future external ascii variable length header - under review
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*/
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#if (VERSION == 4)
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typedef struct XimAsciiHeader {
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char file_version[4]; /* header version */
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char header_size[8]; /* Size of file header (fixed part only) */
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char image_height[8]; /* Height of the raster imgage in pixels */
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char image_width[8]; /* Width of the raster image in pixels */
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char bytes_line[8]; /* Actual # of bytes separating scanlines */
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char bits_channel[4]; /* Bits per channel (usually 1 or 8) */
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char num_channels[4]; /* 1 = pixmap, 3 = RG&B buffers */
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char alpha_channel[2]; /* Alpha channel flag */
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char num_colors[4]; /* Number of entries in c_map (if any) */
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char num_pictures[4]; /* Number of images in file */
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char compress_flag[2]; /* Runlength encoded flag */
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char greyscale_flag[2]; /* Greyscale flag */
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char future_flags[4];
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char author[48]; /* Name of who made it, from passwd entry */
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char date[32]; /* Unix format date */
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char program[32]; /* Program that created this */
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char gamcor[12]; /* image storage gamma */
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char chroma_red[24]; /* image red primary chromaticity coords. */
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char chroma_grn[24]; /* " green " " " */
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char chroma_blu[24]; /* " blue " " " */
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char chroma_wht[24]; /* " white point " " */
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char comment_length[8] /* Total length of all comments */
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/* char *comment; Null separated comments */
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/* byte c_map[]; RGB Colortable, (ncolors * 3 bytes) */
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} XimAsciiHeader;
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#endif VERSION 4
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#ifndef rnd
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#define rnd(x) ((int)((float)(x) + 0.5)) /* round a float to an int */
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#endif
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/* Note:
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* - All external data is in char's in order to maintain easily
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* portability across machines and some human readibility.
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* - Images may be stored as bitmaps (8 pixels/byte), pixmaps
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* (1 byte /pixel) or as seperate red, green, blue channel data
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* (3 bytes/pixel).
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* - An alpha channel is optional and is found after every num_channels
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* of data.
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* - Pixmaps or RG&B (and alpha) channel data are stored respectively
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* after the header.
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* - If num_channels == 1 a pixmap is assumed and the colormap in the
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* header is used unless its greyscale.
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* - Datasize is for one channel.
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*/
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/*** end ImageHeader.h ***/
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#define XDECR 1
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#define YDECR 2
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#define YMAJOR 4
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#define RED 0
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#define GRN 1
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#define BLU 2
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#define EXP 3
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#define MAXLINE 512
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#define setcolor(col,r,g,b) (col[RED]=(r), col[GRN]=(g), col[BLU]=(b))
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#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \
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c1[2]=c2[2],c1[3]=c2[3])
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#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],\
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(c1)[2]=(c2)[2])
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#define COLXS 128 /* excess used for exponent */
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typedef float COLOR[3]; /* red, green, blue */
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typedef byte COLR[4]; /* red, green, blue, exponent */
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| 220 |
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#define FREE(a) if ((a) != NULL) free((char*)(a)), (a) = NULL
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| 222 |
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char *AllocAndCopy();
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extern debug_flag;
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static byte RadiancePixel();
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XimReadRadiance(ifp, xim, gamcor)
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FILE *ifp;
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XimImage *xim;
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double gamcor;
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{
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register int x, y, i;
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int width, height;
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COLOR *scanline; /* RADIANCE variable */
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struct timeval time_val;
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struct timezone time_zone;
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struct passwd *getpwnam(), *getpwuid(), *pwd = NULL;
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char *login_ptr = NULL, *ctime(), *getlogin();
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byte gmap[256];
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/* get width, height from radiance file */
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bzero(xim, sizeof(XimImage));
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if (!RadianceGetSize(ifp, &width, &height))
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return 0;
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xim->width = xim->bytes_line = width;
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xim->height = height;
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| 247 |
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xim->nchannels = 3;
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xim->bits_channel = 8;
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| 249 |
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xim->datasize = xim->height * xim->bytes_line;
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xim->npics = 1;
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| 251 |
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xim->data = (byte *)malloc(xim->datasize);
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| 252 |
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xim->grn_data = (byte *)malloc(xim->datasize);
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| 253 |
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xim->blu_data = (byte *)malloc(xim->datasize);
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| 254 |
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if (!xim->data || !xim->grn_data || !xim->blu_data) {
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| 255 |
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FREE(xim->data);
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| 256 |
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FREE(xim->grn_data);
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| 257 |
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FREE(xim->blu_data);
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| 258 |
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XimWarn("XimReadRadiance: can't malloc xim buffers");
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| 259 |
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return 0;
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| 260 |
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}
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| 261 |
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if (!(scanline = (COLOR*)malloc(width * sizeof(COLOR)))) {
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| 262 |
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XimWarn("XimReadRadiance: can't malloc scanline");
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| 263 |
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return(0);
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| 264 |
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}
|
| 265 |
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for (i=0; i < 256; i++) {
|
| 266 |
|
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gmap[i] = (byte)(0.5 + 255.0 * pow(i / 255.0, 1.0/gamcor));
|
| 267 |
|
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if (debug_flag)
|
| 268 |
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fprintf(stderr, "%2d: %u\n", i, gmap[i]);
|
| 269 |
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}
|
| 270 |
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for (y=0, i=0; y < height; y++) {
|
| 271 |
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if (!freadscan(scanline, width, ifp)) {
|
| 272 |
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XimWarn("freadscan: read error");
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| 273 |
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free((char*)scanline);
|
| 274 |
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return 0;
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| 275 |
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}
|
| 276 |
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for (x=0; x < width; x++, i++) {
|
| 277 |
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xim->data[i] = gmap[RadiancePixel(scanline[x], RED)];
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| 278 |
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xim->grn_data[i] = gmap[RadiancePixel(scanline[x], GRN)];
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| 279 |
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xim->blu_data[i] = gmap[RadiancePixel(scanline[x], BLU)];
|
| 280 |
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}
|
| 281 |
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}
|
| 282 |
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free((char*)scanline);
|
| 283 |
|
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xim->comments = (char**)calloc(2, sizeof(char*));
|
| 284 |
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xim->comments[0] =AllocAndCopy("converted from RADIANCE format",40);
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| 285 |
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xim->ncomments = 1;
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| 286 |
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(void)gettimeofday(&time_val, &time_zone);
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| 287 |
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xim->date = ctime(&time_val.tv_sec);
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| 288 |
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xim->date[strlen(xim->date)-1] = '\0';
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| 289 |
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/* date points to static memory, so copy it to make freeable */
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| 290 |
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xim->date = AllocAndCopy(xim->date, strlen(xim->date)+1);
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| 291 |
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if ((login_ptr = getlogin()) != NULL)
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| 292 |
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pwd = getpwnam(login_ptr);
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| 293 |
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else
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| 294 |
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pwd = getpwuid(getuid());
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| 295 |
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if (pwd && !(xim->author = AllocAndCopy(pwd->pw_gecos,
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| 296 |
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strlen(pwd->pw_gecos)+1))) {
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| 297 |
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XimWarn("XimReadXwdFile: Can't AllocAndCopy author's name");
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| 298 |
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return 0;
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| 299 |
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} else
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| 300 |
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xim->author = NULL;
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| 301 |
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return 1;
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| 302 |
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}
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| 303 |
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| 304 |
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| 305 |
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XimWriteRadiance(ofp, xim, gamcor)
|
| 306 |
|
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FILE *ofp;
|
| 307 |
|
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XimImage *xim;
|
| 308 |
|
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double gamcor;
|
| 309 |
|
|
{
|
| 310 |
|
|
COLOR *scanline;
|
| 311 |
|
|
int width, height;
|
| 312 |
|
|
register int x, y;
|
| 313 |
|
|
register byte *red, *grn, *blu;
|
| 314 |
|
|
float gmap[256];
|
| 315 |
|
|
|
| 316 |
|
|
/* get width, height from xim */
|
| 317 |
|
|
width = xim->width;
|
| 318 |
|
|
height = xim->height;
|
| 319 |
|
|
|
| 320 |
|
|
/* allocate scan line space */
|
| 321 |
|
|
if (!(scanline = (COLOR *)malloc(width * sizeof(COLOR)))) {
|
| 322 |
|
|
XimWarn("XimWriteRadiance: cant' alloc scanline");
|
| 323 |
|
|
return(0);
|
| 324 |
|
|
}
|
| 325 |
|
|
/* write out the RADIANCE header */
|
| 326 |
|
|
radiance_writeheader(ofp, width, height);
|
| 327 |
|
|
red = xim->data;
|
| 328 |
|
|
grn = xim->grn_data;
|
| 329 |
|
|
blu = xim->blu_data;
|
| 330 |
|
|
for (x=0; x < 256; x++) {
|
| 331 |
|
|
gmap[x] = (float)pow((x / 255.0), gamcor);
|
| 332 |
|
|
if (debug_flag)
|
| 333 |
|
|
fprintf(stderr, "%2d: %f\n", x, gmap[x]);
|
| 334 |
|
|
}
|
| 335 |
|
|
for (y = 0; y < height; y++) {
|
| 336 |
|
|
for (x = 0; x < width; x++)
|
| 337 |
|
|
setcolor(scanline[x], gmap[red[x]], gmap[grn[x]], gmap[blu[x]]);
|
| 338 |
|
|
radiance_writescanline(ofp, scanline, width);
|
| 339 |
|
|
red += xim->bytes_line;
|
| 340 |
|
|
grn += xim->bytes_line;
|
| 341 |
|
|
blu += xim->bytes_line;
|
| 342 |
|
|
}
|
| 343 |
|
|
return 1;
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
static RadianceGetSize(fp, w, h)
|
| 347 |
|
|
FILE *fp;
|
| 348 |
|
|
int *w, *h;
|
| 349 |
|
|
{
|
| 350 |
|
|
if (!GetHeader(fp, NULL))
|
| 351 |
|
|
return 0;
|
| 352 |
|
|
if (fgetresolu(w, h, fp) != (YMAJOR | YDECR)) {
|
| 353 |
|
|
fprintf(stderr, "bad RADIANCE format\n");
|
| 354 |
|
|
return 0;
|
| 355 |
|
|
}
|
| 356 |
|
|
return 1;
|
| 357 |
|
|
}
|
| 358 |
|
|
|
| 359 |
|
|
static byte RadiancePixel(pixel, chan)
|
| 360 |
|
|
COLOR pixel;
|
| 361 |
|
|
int chan;
|
| 362 |
|
|
{
|
| 363 |
|
|
float value;
|
| 364 |
|
|
|
| 365 |
|
|
value = pixel[chan];
|
| 366 |
|
|
if (value <= 0.0)
|
| 367 |
|
|
return (byte)0;
|
| 368 |
|
|
else if (value >= 1.0)
|
| 369 |
|
|
return (byte)255;
|
| 370 |
|
|
return (byte)((int)((value * 256.0)));
|
| 371 |
|
|
}
|
| 372 |
|
|
|
| 373 |
|
|
static radiance_writeheader(fp, x, y)
|
| 374 |
|
|
FILE *fp;
|
| 375 |
|
|
int x;
|
| 376 |
|
|
int y;
|
| 377 |
|
|
{
|
| 378 |
|
|
fputc('\n', fp);
|
| 379 |
|
|
fputresolu(YMAJOR | YDECR, x, y, fp);
|
| 380 |
|
|
fflush(fp);
|
| 381 |
|
|
}
|
| 382 |
|
|
|
| 383 |
|
|
|
| 384 |
|
|
radiance_writescanline(fp, buf, x)
|
| 385 |
|
|
FILE *fp;
|
| 386 |
|
|
COLOR *buf;
|
| 387 |
|
|
int x;
|
| 388 |
|
|
{
|
| 389 |
|
|
if (fwritescan(buf, x, fp) < 0) {
|
| 390 |
|
|
fprintf(stderr, "write error?\n");
|
| 391 |
|
|
perror("fwrite");
|
| 392 |
|
|
exit(1);
|
| 393 |
|
|
}
|
| 394 |
|
|
}
|
| 395 |
|
|
|
| 396 |
|
|
|
| 397 |
|
|
freadscan(scanline, len, fp) /* read in a scanline */
|
| 398 |
|
|
register COLOR *scanline;
|
| 399 |
|
|
int len;
|
| 400 |
|
|
register FILE *fp;
|
| 401 |
|
|
{
|
| 402 |
|
|
COLR thiscolr;
|
| 403 |
|
|
int rshift;
|
| 404 |
|
|
register int i;
|
| 405 |
|
|
|
| 406 |
|
|
rshift = 0;
|
| 407 |
|
|
while (len > 0) {
|
| 408 |
|
|
thiscolr[RED] = getc(fp);
|
| 409 |
|
|
thiscolr[GRN] = getc(fp);
|
| 410 |
|
|
thiscolr[BLU] = getc(fp);
|
| 411 |
|
|
thiscolr[EXP] = getc(fp);
|
| 412 |
|
|
if (feof(fp) || ferror(fp))
|
| 413 |
|
|
return 0;
|
| 414 |
|
|
if (thiscolr[RED] == 1 &&
|
| 415 |
|
|
thiscolr[GRN] == 1 &&
|
| 416 |
|
|
thiscolr[BLU] == 1) {
|
| 417 |
|
|
for (i = thiscolr[EXP] << rshift; i > 0; i--) {
|
| 418 |
|
|
copycolor(scanline[0], scanline[-1]);
|
| 419 |
|
|
scanline++;
|
| 420 |
|
|
len--;
|
| 421 |
|
|
}
|
| 422 |
|
|
rshift += 8;
|
| 423 |
|
|
} else {
|
| 424 |
|
|
colr_color(scanline[0], thiscolr);
|
| 425 |
|
|
scanline++;
|
| 426 |
|
|
len--;
|
| 427 |
|
|
rshift = 0;
|
| 428 |
|
|
}
|
| 429 |
|
|
}
|
| 430 |
|
|
return 1;
|
| 431 |
|
|
}
|
| 432 |
|
|
|
| 433 |
|
|
|
| 434 |
|
|
colr_color(col, clr) /* convert short to float color */
|
| 435 |
|
|
register COLOR col;
|
| 436 |
|
|
register COLR clr;
|
| 437 |
|
|
{
|
| 438 |
|
|
double f;
|
| 439 |
|
|
|
| 440 |
|
|
if (clr[EXP] == 0)
|
| 441 |
|
|
col[RED] = col[GRN] = col[BLU] = 0.0;
|
| 442 |
|
|
else {
|
| 443 |
|
|
f = ldexp(1.0, (int) clr[EXP] - (COLXS + 8));
|
| 444 |
|
|
col[RED] = (clr[RED] + 0.5) * f;
|
| 445 |
|
|
col[GRN] = (clr[GRN] + 0.5) * f;
|
| 446 |
|
|
col[BLU] = (clr[BLU] + 0.5) * f;
|
| 447 |
|
|
}
|
| 448 |
|
|
}
|
| 449 |
|
|
|
| 450 |
|
|
static GetHeader(fp, f) /* get header from file */
|
| 451 |
|
|
FILE *fp;
|
| 452 |
|
|
int (*f)();
|
| 453 |
|
|
{
|
| 454 |
|
|
char buf[MAXLINE];
|
| 455 |
|
|
|
| 456 |
|
|
for (;;) {
|
| 457 |
|
|
buf[MAXLINE - 2] = '\n';
|
| 458 |
|
|
if (fgets(buf, sizeof(buf), fp) == NULL)
|
| 459 |
|
|
return (-1);
|
| 460 |
|
|
if (buf[0] == '\n')
|
| 461 |
|
|
return 1;
|
| 462 |
|
|
if (buf[MAXLINE - 2] != '\n') {
|
| 463 |
|
|
ungetc(buf[MAXLINE - 2], fp); /* prevent false end */
|
| 464 |
|
|
buf[MAXLINE - 2] = '\0';
|
| 465 |
|
|
}
|
| 466 |
|
|
if (f != NULL)
|
| 467 |
|
|
(*f)(buf);
|
| 468 |
|
|
}
|
| 469 |
|
|
}
|
| 470 |
|
|
|
| 471 |
|
|
|
| 472 |
|
|
static fgetresolu(xrp, yrp, fp) /* get x and y resolution */
|
| 473 |
|
|
int *xrp, *yrp;
|
| 474 |
|
|
FILE *fp;
|
| 475 |
|
|
{
|
| 476 |
|
|
char buf[64], *xndx, *yndx;
|
| 477 |
|
|
register char *cp;
|
| 478 |
|
|
register int ord;
|
| 479 |
|
|
|
| 480 |
|
|
if (fgets(buf, sizeof(buf), fp) == NULL)
|
| 481 |
|
|
return (-1);
|
| 482 |
|
|
xndx = yndx = NULL;
|
| 483 |
|
|
for (cp = buf + 1; *cp; cp++)
|
| 484 |
|
|
if (*cp == 'X')
|
| 485 |
|
|
xndx = cp;
|
| 486 |
|
|
else if (*cp == 'Y')
|
| 487 |
|
|
yndx = cp;
|
| 488 |
|
|
if (xndx == NULL || yndx == NULL)
|
| 489 |
|
|
return (-1);
|
| 490 |
|
|
ord = 0;
|
| 491 |
|
|
if (xndx > yndx)
|
| 492 |
|
|
ord |= YMAJOR;
|
| 493 |
|
|
if (xndx[-1] == '-')
|
| 494 |
|
|
ord |= XDECR;
|
| 495 |
|
|
if (yndx[-1] == '-')
|
| 496 |
|
|
ord |= YDECR;
|
| 497 |
|
|
if ((*xrp = atoi(xndx + 1)) <= 0)
|
| 498 |
|
|
return (-1);
|
| 499 |
|
|
if ((*yrp = atoi(yndx + 1)) <= 0)
|
| 500 |
|
|
return (-1);
|
| 501 |
|
|
return(ord);
|
| 502 |
|
|
}
|
| 503 |
|
|
|
| 504 |
|
|
|
| 505 |
|
|
fputresolu(ord, xres, yres, fp) /* put x and y resolution */
|
| 506 |
|
|
register int ord;
|
| 507 |
|
|
int xres, yres;
|
| 508 |
|
|
FILE *fp;
|
| 509 |
|
|
{
|
| 510 |
|
|
if (ord & YMAJOR)
|
| 511 |
|
|
fprintf(fp, "%cY %d %cX %d\n", ord & YDECR ? '-' : '+', yres,
|
| 512 |
|
|
ord & XDECR ? '-' : '+', xres);
|
| 513 |
|
|
else
|
| 514 |
|
|
fprintf(fp, "%cX %d %cY %d\n", ord & XDECR ? '-' : '+', xres,
|
| 515 |
|
|
ord & YDECR ? '-' : '+', yres);
|
| 516 |
|
|
}
|
| 517 |
|
|
|
| 518 |
|
|
|
| 519 |
|
|
fwritescan(scanline, len, fp) /* write out a scanline */
|
| 520 |
|
|
register COLOR *scanline;
|
| 521 |
|
|
int len;
|
| 522 |
|
|
register FILE *fp;
|
| 523 |
|
|
{
|
| 524 |
|
|
int rept;
|
| 525 |
|
|
COLR lastcolr, thiscolr;
|
| 526 |
|
|
|
| 527 |
|
|
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1;
|
| 528 |
|
|
lastcolr[EXP] = 0;
|
| 529 |
|
|
rept = 0;
|
| 530 |
|
|
while (len > 0) {
|
| 531 |
|
|
setcolr(thiscolr, scanline[0][RED],
|
| 532 |
|
|
scanline[0][GRN],
|
| 533 |
|
|
scanline[0][BLU]);
|
| 534 |
|
|
if (thiscolr[EXP] == lastcolr[EXP] &&
|
| 535 |
|
|
thiscolr[RED] == lastcolr[RED] &&
|
| 536 |
|
|
thiscolr[GRN] == lastcolr[GRN] &&
|
| 537 |
|
|
thiscolr[BLU] == lastcolr[BLU])
|
| 538 |
|
|
rept++;
|
| 539 |
|
|
else {
|
| 540 |
|
|
while (rept) { /* write out count */
|
| 541 |
|
|
putc(1, fp);
|
| 542 |
|
|
putc(1, fp);
|
| 543 |
|
|
putc(1, fp);
|
| 544 |
|
|
putc(rept & 255, fp);
|
| 545 |
|
|
rept >>= 8;
|
| 546 |
|
|
}
|
| 547 |
|
|
putc(thiscolr[RED], fp); /* new color */
|
| 548 |
|
|
putc(thiscolr[GRN], fp);
|
| 549 |
|
|
putc(thiscolr[BLU], fp);
|
| 550 |
|
|
putc(thiscolr[EXP], fp);
|
| 551 |
|
|
copycolr(lastcolr, thiscolr);
|
| 552 |
|
|
rept = 0;
|
| 553 |
|
|
}
|
| 554 |
|
|
scanline++;
|
| 555 |
|
|
len--;
|
| 556 |
|
|
}
|
| 557 |
|
|
while (rept) { /* write out count */
|
| 558 |
|
|
putc(1, fp);
|
| 559 |
|
|
putc(1, fp);
|
| 560 |
|
|
putc(1, fp);
|
| 561 |
|
|
putc(rept & 255, fp);
|
| 562 |
|
|
rept >>= 8;
|
| 563 |
|
|
}
|
| 564 |
|
|
return (ferror(fp) ? -1 : 0);
|
| 565 |
|
|
}
|
| 566 |
|
|
|
| 567 |
|
|
static setcolr(clr, r, g, b) /* assign a short color value */
|
| 568 |
|
|
register COLR clr;
|
| 569 |
|
|
double r, g, b;
|
| 570 |
|
|
{
|
| 571 |
|
|
double d, frexp();
|
| 572 |
|
|
int e;
|
| 573 |
|
|
|
| 574 |
|
|
d = r > g ? r : g;
|
| 575 |
|
|
if (b > d)
|
| 576 |
|
|
d = b;
|
| 577 |
|
|
if (d <= 1e-32) {
|
| 578 |
|
|
clr[RED] = clr[GRN] = clr[BLU] = 0;
|
| 579 |
|
|
clr[EXP] = 0;
|
| 580 |
|
|
return;
|
| 581 |
|
|
}
|
| 582 |
|
|
d = frexp(d, &e) * 256.0 / d;
|
| 583 |
|
|
|
| 584 |
|
|
clr[RED] = (byte)(r * d);
|
| 585 |
|
|
clr[GRN] = (byte)(g * d);
|
| 586 |
|
|
clr[BLU] = (byte)(b * d);
|
| 587 |
|
|
clr[EXP] = (byte)(e + COLXS);
|
| 588 |
|
|
}
|
| 589 |
|
|
|
| 590 |
|
|
/*** radiance_io.c ***/
|
