BSD 4_3_Tahoe development

[unix-history] / usr / src / new / X / libvs100 / draw.c

/* $Header: draw.c,v 10.3 86/02/01 15:46:46 tony Rel $ */
/* draw.c       Draw lines, curves, and polygons on the screen
*
*      DrawCurve       Draw a generalized line/polygon/combination
*
*/

/****************************************************************************
*                                                                          *
*  Copyright (c) 1983, 1984 by                                             *
*  DIGITAL EQUIPMENT CORPORATION, Maynard, Massachusetts.                  *
*  All rights reserved.                                                    *
*                                                                          *
*  This software is furnished on an as-is basis and may be used and copied *
*  only with inclusion of the above copyright notice. This software or any *
*  other copies thereof may be provided or otherwise made available to     *
*  others only for non-commercial purposes.  No title to or ownership of   *
*  the software is hereby transferred.                                     *
*                                                                          *
*  The information in this software is  subject to change without notice   *
*  and  should  not  be  construed as  a commitment by DIGITAL EQUIPMENT   *
*  CORPORATION.                                                            *
*                                                                          *
*  DIGITAL assumes no responsibility for the use  or  reliability of its   *
*  software on equipment which is not supplied by DIGITAL.                 *
*                                                                          *
*                                                                          *
****************************************************************************/

#include "vs100.h"

extern BitMap screen;
extern int VSReloc;
extern char SSMap[];

char *AllocateCopy(), *AllocateSpace();

DrawCurve (verts, vertcount, xbase, ybase, srcpix, altpix, mode,
          bwidth, bheight, pat, patlen, patmul, clips, clipcount, func, zmask)
       Vertex *verts;
       int vertcount, xbase, ybase, srcpix, altpix, mode, bwidth, bheight;
       int pat, patlen, patmul, clipcount, zmask;
       register int func;
       CLIP *clips;
{
       register DrawCurvePacket *dcp;
#define h ((PacketHeader *) dcp->dcp_head)
#define size ((Extent *) dcp->dcp_maskSize)
#define destOff ((Point *) dcp->dcp_destOffset)
#define path ((SegmentList *) dcp->dcp_path)
#define clip ((RectangleList *) dcp->dcp_clipping.rectList)
#define pstr ((PatternString *) dcp->dcp_pattern)
#define pstate ((PatternState *) dcp->dcp_patState.literal)

       if (!(zmask & 1)) {
           DeallocateSpace ();
           return;
       }
       if ((verts = (Vertex *) AllocateCopy ((caddr_t) verts, vertcount * sizeof (Vertex))) == NULL ||
           (dcp = (DrawCurvePacket *) AllocateSpace (sizeof (DrawCurvePacket))) == NULL)
           return;

       func = SSMap[func];
       h->ph_drawMod.m_source = 0;     /* Always constant here */
       h->ph_drawMod.m_mask = 0;
       h->ph_drawMod.m_map = MAPTYPE(func);
       if (mode == 0) {
           h->ph_drawMod.m_drawMode = 0;
           h->ph_drawMod.m_patMode = 0;
       } else {
           h->ph_drawMod.m_drawMode = 1;
           h->ph_drawMod.m_patMode = mode - 1;
       }
       h->ph_drawMod.m_patState = 0;
       h->ph_opcode = DRAW_CURVE;
       *(long *) h->ph_next = NULL;

       dcp->dcp_source.const = srcpix & 1;
       dcp->dcp_secondSource.const = altpix & 1;

       size->e_height = bheight;
       size->e_width = bwidth;

       *(BitMap *) dcp->dcp_destImage = screen;
       destOff->p_x = xbase;
       destOff->p_y = ybase;

       *(short *) dcp->dcp_map.literal = MAPLIT(func);

       pstr->p_pattern = pat;
       pstr->p_length = patlen;
       pstr->p_multiplier = patmul;
       pstate->p_position = 0;
       pstate->p_count = 0;

       if (clipcount == 1) {
           h->ph_drawMod.m_clipping = 1;
           *(CLIP *) dcp->dcp_clipping.litRect = *clips;
       } else {
           h->ph_drawMod.m_clipping = 2;
           *(caddr_t *) clip->r_first = (caddr_t) clips + VSReloc;
           clip->r_count = clipcount;
       }

       *(caddr_t *) path->seg_first = (caddr_t) verts + VSReloc;
       path->seg_count = vertcount;

       WritePacket ((caddr_t) dcp);
#undef h
#undef size
#undef destOff
#undef path
#undef clip
#undef pstr
#undef pstate
}