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Annotation of 43BSD/contrib/X/libvs100/draw.c, revision 1.1

1.1     ! root        1: /* $Header: draw.c,v 10.3 86/02/01 15:46:46 tony Rel $ */
        !             2: /* draw.c      Draw lines, curves, and polygons on the screen
        !             3:  *
        !             4:  *     DrawCurve       Draw a generalized line/polygon/combination
        !             5:  *
        !             6:  */
        !             7: 
        !             8: /****************************************************************************
        !             9:  *                                                                         *
        !            10:  *  Copyright (c) 1983, 1984 by                                                    *
        !            11:  *  DIGITAL EQUIPMENT CORPORATION, Maynard, Massachusetts.                 *
        !            12:  *  All rights reserved.                                                   *
        !            13:  *                                                                         *
        !            14:  *  This software is furnished on an as-is basis and may be used and copied *
        !            15:  *  only with inclusion of the above copyright notice. This software or any *
        !            16:  *  other copies thereof may be provided or otherwise made available to     *
        !            17:  *  others only for non-commercial purposes.  No title to or ownership of   *
        !            18:  *  the software is hereby transferred.                                            *
        !            19:  *                                                                         *
        !            20:  *  The information in this software is  subject to change without notice   *
        !            21:  *  and  should  not  be  construed as  a commitment by DIGITAL EQUIPMENT   *
        !            22:  *  CORPORATION.                                                           *
        !            23:  *                                                                         *
        !            24:  *  DIGITAL assumes no responsibility for the use  or  reliability of its   *
        !            25:  *  software on equipment which is not supplied by DIGITAL.                *
        !            26:  *                                                                         *
        !            27:  *                                                                         *
        !            28:  ****************************************************************************/
        !            29: 
        !            30: #include "vs100.h"
        !            31: 
        !            32: extern BitMap screen;
        !            33: extern int VSReloc;
        !            34: extern char SSMap[];
        !            35: 
        !            36: char *AllocateCopy(), *AllocateSpace();
        !            37: 
        !            38: DrawCurve (verts, vertcount, xbase, ybase, srcpix, altpix, mode,
        !            39:           bwidth, bheight, pat, patlen, patmul, clips, clipcount, func, zmask)
        !            40:        Vertex *verts;
        !            41:        int vertcount, xbase, ybase, srcpix, altpix, mode, bwidth, bheight;
        !            42:        int pat, patlen, patmul, clipcount, zmask;
        !            43:        register int func;
        !            44:        CLIP *clips;
        !            45: {
        !            46:        register DrawCurvePacket *dcp;
        !            47: #define        h ((PacketHeader *) dcp->dcp_head)
        !            48: #define        size ((Extent *) dcp->dcp_maskSize)
        !            49: #define        destOff ((Point *) dcp->dcp_destOffset)
        !            50: #define        path ((SegmentList *) dcp->dcp_path)
        !            51: #define        clip ((RectangleList *) dcp->dcp_clipping.rectList)
        !            52: #define pstr ((PatternString *) dcp->dcp_pattern)
        !            53: #define pstate ((PatternState *) dcp->dcp_patState.literal)
        !            54: 
        !            55:        if (!(zmask & 1)) {
        !            56:            DeallocateSpace ();
        !            57:            return;
        !            58:        }
        !            59:        if ((verts = (Vertex *) AllocateCopy ((caddr_t) verts, vertcount * sizeof (Vertex))) == NULL ||
        !            60:            (dcp = (DrawCurvePacket *) AllocateSpace (sizeof (DrawCurvePacket))) == NULL)
        !            61:            return;
        !            62: 
        !            63:        func = SSMap[func];
        !            64:        h->ph_drawMod.m_source = 0;     /* Always constant here */
        !            65:        h->ph_drawMod.m_mask = 0;
        !            66:        h->ph_drawMod.m_map = MAPTYPE(func);
        !            67:        if (mode == 0) {
        !            68:            h->ph_drawMod.m_drawMode = 0;
        !            69:            h->ph_drawMod.m_patMode = 0;
        !            70:        } else {
        !            71:            h->ph_drawMod.m_drawMode = 1;
        !            72:            h->ph_drawMod.m_patMode = mode - 1;
        !            73:        }
        !            74:        h->ph_drawMod.m_patState = 0;
        !            75:        h->ph_opcode = DRAW_CURVE;
        !            76:        *(long *) h->ph_next = NULL;
        !            77: 
        !            78:        dcp->dcp_source.const = srcpix & 1;
        !            79:        dcp->dcp_secondSource.const = altpix & 1;
        !            80: 
        !            81:        size->e_height = bheight;
        !            82:        size->e_width = bwidth;
        !            83: 
        !            84:        *(BitMap *) dcp->dcp_destImage = screen;
        !            85:        destOff->p_x = xbase;
        !            86:        destOff->p_y = ybase;
        !            87: 
        !            88:        *(short *) dcp->dcp_map.literal = MAPLIT(func);
        !            89: 
        !            90:        pstr->p_pattern = pat;
        !            91:        pstr->p_length = patlen;
        !            92:        pstr->p_multiplier = patmul;
        !            93:        pstate->p_position = 0;
        !            94:        pstate->p_count = 0;
        !            95: 
        !            96:        if (clipcount == 1) {
        !            97:            h->ph_drawMod.m_clipping = 1;
        !            98:            *(CLIP *) dcp->dcp_clipping.litRect = *clips;
        !            99:        } else {
        !           100:            h->ph_drawMod.m_clipping = 2;
        !           101:            *(caddr_t *) clip->r_first = (caddr_t) clips + VSReloc;
        !           102:            clip->r_count = clipcount;
        !           103:        }
        !           104: 
        !           105:        *(caddr_t *) path->seg_first = (caddr_t) verts + VSReloc;
        !           106:        path->seg_count = vertcount;
        !           107: 
        !           108:        WritePacket ((caddr_t) dcp);
        !           109: #undef h
        !           110: #undef size
        !           111: #undef destOff
        !           112: #undef path
        !           113: #undef clip
        !           114: #undef pstr
        !           115: #undef pstate
        !           116: }

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