/* * This software is copyrighted as noted below. It may be freely copied, * modified, and redistributed, provided that the copyright notice is * preserved on all copies. * * There is no warranty or other guarantee of fitness for this software, * it is provided solely "as is". Bug reports or fixes may be sent * to the author, who may or may not act on them as he desires. * * You may not include this software in a program or other software product * without supplying the source, or without informing the end-user that the * source is available for no extra charge. * * If you modify this software, you should include a notice giving the * name of the person performing the modification, the date of modification, * and the reason for such modification. * * Modified at BRL 16-May-88 by Mike Muuss to avoid Alliant STDC desire * to have all "void" functions so declared. */ /* * Runput.c - General purpose Run Length Encoding. * * Author: Spencer W. Thomas * Computer Science Dept. * University of Utah * Date: Mon Aug 9 1982 * Copyright (c) 1982,1986 Spencer W. Thomas * * $Id: Runput.c,v 3.0.1.1 1992/01/28 18:17:40 spencer Exp $ * * Modified by: Todd W. Fuqua * Date: Jul 22 1984 * convert to new RLE format to make room for larger frame buffers */ /* THIS IS WAY OUT OF DATE. See rle.5. * The output file format is: * * Word 0: A "magic" number. The top byte of the word contains * the letter 'R' or the letter 'W'. 'W' indicates that * only black and white information was saved. The bottom * byte is one of the following: * ' ': Means a straight "box" save, -S flag was given. * 'B': Image saved with background color, clear screen to * background before restoring image. * 'O': Image saved in overlay mode. * * Words 1-6: The structure * { short xpos, Lower left corner * ypos, * xsize, Size of saved box * ysize; * char rgb[3]; Background color * char map; flag for map presence * } * * If the map flag is non-zero, then the color map will follow as * 3*256 16 bit words, first the red map, then the green map, and * finally the blue map. * * Following the setup information is the Run Length Encoded image. * Each instruction consists of a 4-bit opcode, a 12-bit datum and * possibly one or more following words (all words are 16 bits). The * instruction opcodes are: * * SkipLines (1): The bottom 10 bits are an unsigned number to be added to * current Y position. * * SetColor (2): The datum indicates which color is to be loaded with * the data described by the following ByteData and * RunData instructions. 0->red, 1->green, 2->blue. The * operation also resets the X position to the initial * X (i.e. a carriage return operation is performed). * * SkipPixels (3): The bottom 10 bits are an unsigned number to be * added to the current X position. * * ByteData (5): The datum is one less than the number of bytes of * color data following. If the number of bytes is * odd, a filler byte will be appended to the end of * the byte string to make an integral number of 16-bit * words. The bytes are in PDP-11 order. The X * position is incremented to follow the last byte of * data. * * RunData (6): The datum is one less than the run length. The * following word contains (in its lower 8 bits) the * color of the run. The X position is incremented to * follow the last byte in the run. */ #include #include #include "rle_put.h" #include "rle.h" #include "rle_code.h" #include "vaxshort.h" #include "Runput.h" #define UPPER 255 /* anything bigger ain't a byte */ /* * Macros to make writing instructions with correct byte order easier. */ /* Write a two-byte value in little_endian order. */ #define put16(a) (putc((a)&0xff,rle_fd),putc((char)(((a)>>8)&0xff),rle_fd)) /* short instructions */ #define mk_short_1(oper,a1) /* one argument short */ \ putc(oper,rle_fd), putc((char)a1,rle_fd) #define mk_short_2(oper,a1,a2) /* two argument short */ \ putc(oper,rle_fd), putc((char)a1,rle_fd), put16(a2) /* long instructions */ #define mk_long_1(oper,a1) /* one argument long */ \ putc((char)(LONG|oper),rle_fd), putc('\0', rle_fd), put16(a1) #define mk_long_2(oper,a1,a2) /* two argument long */ \ putc((char)(LONG|oper),rle_fd), putc('\0', rle_fd), \ put16(a1), put16(a2) /* choose between long and short format instructions */ /* NOTE: these macros can only be used where a STATEMENT is legal */ #define mk_inst_1(oper,a1) /* one argument inst */ \ if (a1>UPPER) (mk_long_1(oper,a1)); else (mk_short_1(oper,a1)) #define mk_inst_2(oper,a1,a2) /* two argument inst */ \ if (a1>UPPER) (mk_long_2(oper,a1,a2)); else (mk_short_2(oper,a1,a2)) /* * Opcode definitions */ #define RSkipLines(n) mk_inst_1(RSkipLinesOp,(n)) #define RSetColor(c) mk_short_1(RSetColorOp,(c)) /* has side effect of performing */ /* "carriage return" action */ #define RSkipPixels(n) mk_inst_1(RSkipPixelsOp,(n)) #define RNewLine RSkipLines(1) #define RByteData(n) mk_inst_1(RByteDataOp,n) /* followed by ((n+1)/2)*2 bytes */ /* of data. If n is odd, last */ /* byte will be ignored */ /* "cursor" is left at pixel */ /* following last pixel written */ #define RRunData(n,c) mk_inst_2(RRunDataOp,(n),(c)) /* next word contains color data */ /* "cursor" is left at pixel after */ /* end of run */ #define REOF mk_inst_1(REOFOp,0) /* Really opcode only */ /***************************************************************** * TAG( RunSetup ) * Put out initial setup data for RLE files. */ void RunSetup(rle_hdr * the_hdr) { struct XtndRsetup setup; FILE * rle_fd = the_hdr->rle_file; put16( RLE_MAGIC ); if ( the_hdr->background == 2 ) setup.h_flags = H_CLEARFIRST; else if ( the_hdr->background == 0 ) setup.h_flags = H_NO_BACKGROUND; else setup.h_flags = 0; if ( the_hdr->alpha ) setup.h_flags |= H_ALPHA; if ( the_hdr->comments != NULL && *the_hdr->comments != NULL ) setup.h_flags |= H_COMMENT; setup.h_ncolors = the_hdr->ncolors; setup.h_pixelbits = 8; /* Grinnell dependent */ if ( the_hdr->ncmap > 0 && the_hdr->cmap == NULL ) { fprintf( stderr, "%s: Color map of size %d*%d specified, but not supplied, writing %s\n", the_hdr->cmd, the_hdr->ncmap, (1 << the_hdr->cmaplen), the_hdr->file_name ); the_hdr->ncmap = 0; } setup.h_cmaplen = the_hdr->cmaplen; /* log2 of color map size */ setup.h_ncmap = the_hdr->ncmap; /* no of color channels */ vax_pshort(setup.hc_xpos,the_hdr->xmin); vax_pshort(setup.hc_ypos,the_hdr->ymin); vax_pshort(setup.hc_xlen,the_hdr->xmax - the_hdr->xmin + 1); vax_pshort(setup.hc_ylen,the_hdr->ymax - the_hdr->ymin + 1); fwrite((char *)&setup, SETUPSIZE, 1, rle_fd); if ( the_hdr->background != 0 ) { int i; rle_pixel *background = (rle_pixel *)malloc( (unsigned)(the_hdr->ncolors + 1) ); int *bg_color; /* * If even number of bg color bytes, put out one more to get to * 16 bit boundary. */ bg_color = the_hdr->bg_color; for ( i = 0; i < the_hdr->ncolors; i++ ) background[i] = *bg_color++; /* Extra byte, if written, should be 0. */ background[i] = 0; fwrite((char *)background, (the_hdr->ncolors / 2) * 2 + 1, 1, rle_fd); free( background ); } else putc( '\0', rle_fd ); if (the_hdr->ncmap > 0) { /* Big-endian machines are harder */ int i, nmap = (1 << the_hdr->cmaplen) * the_hdr->ncmap; char *h_cmap = (char *)malloc( nmap * 2 ); if ( h_cmap == NULL ) { fprintf( stderr, "%s: Malloc failed for color map of size %d, writing %s\n", the_hdr->cmd, nmap, the_hdr->file_name ); exit( 1 ); } for ( i = 0; i < nmap; i++ ) vax_pshort( &h_cmap[i*2], the_hdr->cmap[i] ); fwrite( h_cmap, nmap, 2, rle_fd ); free( h_cmap ); } /* Now write out comments if given */ if ( setup.h_flags & H_COMMENT ) { int comlen; CONST_DECL char ** com_p; /* Get the total length of comments */ comlen = 0; for ( com_p = the_hdr->comments; *com_p != NULL; com_p++ ) comlen += 1 + strlen( *com_p ); put16( comlen ); for ( com_p = the_hdr->comments; *com_p != NULL; com_p++ ) fwrite( *com_p, 1, strlen( *com_p ) + 1, rle_fd ); if ( comlen & 1 ) /* if odd length, round up */ putc( '\0', rle_fd ); } } /***************************************************************** * TAG( RunSkipBlankLines ) * Skip one or more blank lines in the RLE file. */ void RunSkipBlankLines(int nblank, rle_hdr * the_hdr) { FILE * rle_fd = the_hdr->rle_file; RSkipLines(nblank); } /***************************************************************** * TAG( RunSetColor ) * Select a color and do carriage return. * color: 0 = Red, 1 = Green, 2 = Blue. */ void RunSetColor(int c, rle_hdr * the_hdr) { FILE * rle_fd = the_hdr->rle_file; RSetColor(c); } /***************************************************************** * TAG( RunSkipPixels ) * Skip a run of background. */ /* ARGSUSED */ void RunSkipPixels(int nskip, int last, int wasrun, rle_hdr * the_hdr) { FILE * rle_fd = the_hdr->rle_file; if (! last && nskip > 0) { RSkipPixels(nskip); } } /***************************************************************** * TAG( RunNewScanLine ) * Perform a newline action. Since CR is implied by the Set Color * operation, only generate code if the newline flag is true. */ void RunNewScanLine(int flag, rle_hdr * the_hdr) { FILE * rle_fd = the_hdr->rle_file; if (flag) { RNewLine; } } /***************************************************************** * TAG( Runputdata ) * Put one or more pixels of byte data into the output file. */ void Runputdata(rle_pixel * buf, int n, rle_hdr * the_hdr) { FILE * rle_fd = the_hdr->rle_file; if (n == 0) return; RByteData(n-1); fwrite((char *)buf, n, 1, rle_fd); if ( n & 1 ) putc( 0, rle_fd ); } /***************************************************************** * TAG( Runputrun ) * Output a single color run. */ /* ARGSUSED */ void Runputrun(int color, int n, int last, rle_hdr * the_hdr) { FILE * rle_fd = the_hdr->rle_file; RRunData(n-1,color); } /***************************************************************** * TAG( RunputEof ) * Output an EOF opcode */ void RunputEof(rle_hdr * the_hdr) { FILE * rle_fd = the_hdr->rle_file; REOF; }