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Annotation of researchv10no/cmd/post.src/postbgi/postbgi.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *
        !             3:  * BGI opcodes.
        !             4:  *
        !             5:  */
        !             6: 
        !             7: #define BRCHAR         033             /* rotated character mode */
        !             8: #define BCHAR          034             /* graphical character mode */
        !             9: #define BGRAPH         035             /* graphical master mode */
        !            10: 
        !            11: #define BSUB           042             /* subroutine definition */
        !            12: #define BRET           043             /* end of subroutine */
        !            13: #define BCALL          044             /* subroutine call */
        !            14: 
        !            15: #define BEND           045             /* end page */
        !            16: #define BERASE         046             /* erase - obsolete */
        !            17: #define BREP           047             /* repeat */
        !            18: #define BENDR          050             /* end repeat */
        !            19: 
        !            20: #define BSETX          051             /* set horizontal position */
        !            21: #define BSETY          052             /* set vertical position */
        !            22: #define BSETXY         053             /* set horizontal and vertical positions */
        !            23: #define BINTEN         054             /* intensify - mark current pixel */
        !            24: 
        !            25: #define BVISX          055             /* manhattan vector - change x first */
        !            26: #define BINVISX                056             /* same as BVISX but nothing drawn */
        !            27: #define BVISY          057             /* manhattan vector - change y first */
        !            28: #define BINVISY                060             /* same as BVISY but nothing drawn */
        !            29: 
        !            30: #define BVEC           061             /* arbitrary long vector */
        !            31: #define BSVEC          062             /* arbitrary short vector */
        !            32: #define BRECT          063             /* outline rectangle */
        !            33: #define BPOINT1                064             /* point plot - mode 1 */
        !            34: #define BPOINT         065             /* point plot - mode 2 */
        !            35: #define BLINE          066             /* line plot */
        !            36: 
        !            37: #define BCSZ           067             /* set character size */
        !            38: #define BLTY           070             /* select line type */
        !            39: #define BARC           071             /* draw circular arc */
        !            40: #define BFARC          072             /* filled circular arc */
        !            41: #define BFRECT         073             /* filled rectangle */
        !            42: #define BRASRECT       074             /* raster rectangle */
        !            43: #define BCOL           075             /* select color */
        !            44: #define BFTRAPH                076             /* filled trapezoid */
        !            45: #define BPAT           077             /* pattern are for filling - no info */
        !            46: 
        !            47: #define BNOISE         0               /* from bad file format */
        !            48: 
        !            49: /*
        !            50:  *
        !            51:  * Character size is controlled by the spacing of dots in a 5x7 dot matrix, which
        !            52:  * by default is set to BGISIZE.
        !            53:  *
        !            54:  */
        !            55: 
        !            56: #define BGISIZE                2               /* default character grid spacing */
        !            57: 
        !            58: /*
        !            59:  *
        !            60:  * Definitions used to decode the bytes read from a BGI file.
        !            61:  *
        !            62:  */
        !            63: 
        !            64: #define CHMASK         0177            /* characters only use 7 bits */
        !            65: #define DMASK          077             /* data values use lower 6 bits */
        !            66: #define MSB            0100            /* used to check for data or opcode */
        !            67: #define SGNB           040             /* sign bit for integers */
        !            68: #define MSBMAG         037             /* mag of most sig byte in a BGI int */
        !            69: 
        !            70: /*
        !            71:  *
        !            72:  * Descriptions of BGI vectors and what's done when they're drawn.
        !            73:  *
        !            74:  */
        !            75: 
        !            76: #define X_COORD                0               /* change x next in manhattan vector */
        !            77: #define Y_COORD                1               /* same but y change comes next */
        !            78: #define LONGVECTOR     2               /* arbitrary long vector */
        !            79: #define SHORTVECTOR    3               /* components given in 6 bits */
        !            80: 
        !            81: #define VISIBLE                0               /* really draw the vector */
        !            82: #define INVISIBLE      1               /* just move the current position */
        !            83: 
        !            84: /*
        !            85:  *
        !            86:  * What's done with a closed path.
        !            87:  *
        !            88:  */
        !            89: 
        !            90: #define OUTLINE                0               /* outline the defined path */
        !            91: #define FILL           1               /* fill it in */
        !            92: 
        !            93: /*
        !            94:  *
        !            95:  * BGI line style definitions. They're used as an index into the STYLES array,
        !            96:  * which really belongs in the prologue.
        !            97:  *
        !            98:  */
        !            99: 
        !           100: #define SOLID          0
        !           101: #define DOTTED         1
        !           102: #define SHORTDASH      2
        !           103: #define DASH           3
        !           104: #define LONGDASH       4
        !           105: #define DOTDASH                5
        !           106: #define THREEDOT       6
        !           107: 
        !           108: #define STYLES                                                         \
        !           109:                                                                        \
        !           110:        {                                                               \
        !           111:            "[]",                                                       \
        !           112:            "[.5 2]",                                                   \
        !           113:            "[2 4]",                                                    \
        !           114:            "[4 4]",                                                    \
        !           115:            "[8 4]",                                                    \
        !           116:            "[.5 2 4 2]",                                               \
        !           117:            "[.5 2 .5 2 .5 2 4 2]"                                      \
        !           118:        }
        !           119: 
        !           120: /*
        !           121:  *
        !           122:  * Three constants used to choose which component (RED, GREEN, or BLUE) we're
        !           123:  * interested in. BGI colors are specified as a single data byte and pulling a
        !           124:  * particular  component out of the BGI color byte is handled by procedure
        !           125:  * get_color().
        !           126:  *
        !           127:  */
        !           128: 
        !           129: #define RED            0
        !           130: #define GREEN          1
        !           131: #define BLUE           2
        !           132: 
        !           133: /*
        !           134:  *
        !           135:  * An array of type Disp is used to save the horizontal and vertical displacements
        !           136:  * that result after a subroutine has been called. Needed so we can properly adjust
        !           137:  * our horizontal and vertical positions after a subroutine call. Entries are made
        !           138:  * immediately after a subroutine is defined and used after the call. Subroutine
        !           139:  * names are integers that range from 0 to 63 (assigned in the BG file) and the
        !           140:  * name is used as an index into the Disp array when we save or retrieve the
        !           141:  * displacement.
        !           142:  *
        !           143:  */
        !           144: 
        !           145: typedef struct {
        !           146:        int     dx;                     /* horizontal and */
        !           147:        int     dy;                     /* vertical displacements */
        !           148: } Disp;
        !           149: 
        !           150: /*
        !           151:  *
        !           152:  * An array of type Fontmap helps convert font names requested by users into
        !           153:  * legitimate PostScript names. The array is initialized using FONTMAP, which must
        !           154:  * end with and entry that has NULL defined as its name field.
        !           155:  *
        !           156:  */
        !           157: 
        !           158: typedef struct {
        !           159:        char    *name;                  /* user's font name */
        !           160:        char    *val;                   /* corresponding PostScript name */
        !           161: } Fontmap;
        !           162: 
        !           163: #define FONTMAP                                                                \
        !           164:                                                                        \
        !           165:        {                                                               \
        !           166:            "R", "Courier",                                             \
        !           167:            "I", "Courier-Oblique",                                     \
        !           168:            "B", "Courier-Bold",                                        \
        !           169:            "CO", "Courier",                                            \
        !           170:            "CI", "Courier-Oblique",                                    \
        !           171:            "CB", "Courier-Bold",                                       \
        !           172:            "CW", "Courier",                                            \
        !           173:            "PO", "Courier",                                            \
        !           174:            "courier", "Courier",                                       \
        !           175:            "cour", "Courier",                                          \
        !           176:            "co", "Courier",                                            \
        !           177:            NULL, NULL                                                  \
        !           178:        }
        !           179: 
        !           180: /*
        !           181:  *
        !           182:  * Two macros that are useful in processing BGI files:
        !           183:  *
        !           184:  *       MAG(A, B)    - Takes bytes A and B which have been read from a BGI file
        !           185:  *                      and returns the magnitude of the integer represented by
        !           186:  *                      the two bytes.
        !           187:  *
        !           188:  *       LINESPACE(A) - Takes BGI size A and returns the number of address units
        !           189:  *                      that can be used for a reasonable interline spacing.
        !           190:  *
        !           191:  */
        !           192: 
        !           193: #define MAG(A, B)      (((A & MSBMAG) << 6) | (B & DMASK))
        !           194: #define LINESPACE(A)   (8 * A)
        !           195: 
        !           196: /*
        !           197:  *
        !           198:  * Some of the non-integer valued functions in postdmd.c.
        !           199:  *
        !           200:  */
        !           201: 
        !           202: char   *get_font();
        !           203: 

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