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Annotation of 43BSDTahoe/new/X/libsun/draw.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char *rcsid_draw_c = "$Header: draw.c,v 10.3 86/11/29 13:47:42 jg Rel $";
        !             3: #endif lint
        !             4: #ifdef sun
        !             5: /*
        !             6:  * The Sun X drivers are a product of Sun Microsystems, Inc. and are provided
        !             7:  * for unrestricted use provided that this legend is included on all tape
        !             8:  * media and as a part of the software program in whole or part.  Users
        !             9:  * may copy or modify these drivers without charge, but are not authorized
        !            10:  * to license or distribute them to anyone else except as part of a product or
        !            11:  * program developed by the user.
        !            12:  * 
        !            13:  * THE SUN X DRIVERS ARE PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND
        !            14:  * INCLUDING THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A
        !            15:  * PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE
        !            16:  * PRACTICE.
        !            17:  *
        !            18:  * The Sun X Drivers are provided with no support and without any obligation
        !            19:  * on the part of Sun Microsystems, Inc. to assist in their use, correction,
        !            20:  * modification or enhancement.
        !            21:  * 
        !            22:  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
        !            23:  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THE SUN X
        !            24:  * DRIVERS OR ANY PART THEREOF.
        !            25:  * 
        !            26:  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
        !            27:  * or profits or other special, indirect and consequential damages, even if
        !            28:  * Sun has been advised of the possibility of such damages.
        !            29:  * 
        !            30:  * Sun Microsystems, Inc.
        !            31:  * 2550 Garcia Avenue
        !            32:  * Mountain View, California  94043
        !            33:  */
        !            34: 
        !            35: #ifndef        lint
        !            36: static char sccsid[] = "@(#)draw.c 2.2 86/01/29 Copyright 1986 Sun Micro";
        !            37: #endif
        !            38: 
        !            39: /*-
        !            40:  * Copyright (c) 1986 by Sun Microsystems,  Inc.
        !            41:  */
        !            42: 
        !            43: /* draw.c      Draw lines, curves, and polygons on the screen
        !            44:  *
        !            45:  *     DrawCurve       Draw a generalized line/polygon/combination
        !            46:  *
        !            47:  */
        !            48: 
        !            49: /*
        !            50:  *     ToDo:
        !            51:  *             Brush shapes
        !            52:  *             Dash/Pattern
        !            53:  *             Curves
        !            54:  */
        !            55: 
        !            56: #include "Xsun.h"
        !            57: 
        !            58: extern struct pixrect *PixRect;
        !            59: 
        !            60: static
        !            61: Draw_Solid(srcpix, xbase, ybase, op, vertcount, verts, clipcount, clips, zmask)
        !            62:     int srcpix;        /* Pixel value to write */
        !            63:     int xbase, ybase;  /* Origin of curve */
        !            64:     int op;            /* Opcode */
        !            65:     int vertcount;     /* Length of Vertex array */
        !            66:     Vertex *verts;     /* Vertices */
        !            67:     int clipcount;     /* Length of clip array */
        !            68:     CLIP *clips;       /* clipping rectangles */
        !            69:     int zmask;
        !            70: {
        !            71:     int allmask = -1;
        !            72: 
        !            73:     SetZmask(PixRect, &zmask);
        !            74:     do {
        !            75:        struct pixrect *region;
        !            76:        int         cleft, ctop, cwidth, cheight;
        !            77:        register int xp, yp;
        !            78:        register Vertex *v = verts;
        !            79:        register int vc = vertcount;
        !            80: 
        !            81:        GetNextClip(clips, cleft, ctop, cwidth, cheight);
        !            82:        CheckCursor(cleft, ctop, cwidth, cheight);
        !            83:        do {
        !            84:            register    xo = xp, yo = yp;
        !            85: 
        !            86:            if (v->flags & VertexRelative) {
        !            87:                xp += v->x;
        !            88:                yp += v->y;
        !            89:            }
        !            90:            else {
        !            91:                xp = v->x + xbase;
        !            92:                yp = v->y + ybase;
        !            93:            }
        !            94:            /* XXX - ignore VertexCurved for now */
        !            95:            /* XXX - ignore VertexDrawLastPoint for now */
        !            96:            if (!(v->flags & VertexDontDraw)) {
        !            97:                register int xmin, ymin, xsize, ysize;
        !            98: 
        !            99:                xmin = imin(xo, xp);
        !           100:                ymin = imin(yo, yp),
        !           101:                    xsize = imax(xo, xp) - imin(xo, xp) + 1;
        !           102:                ysize = imax(yo, yp) - imin(yo, yp) + 1;
        !           103:                if (OverLap(xmin, ymin, xsize, ysize, cleft, ctop, cwidth, cheight)) {
        !           104:                    /* Its at least partly visible */
        !           105:                    if (xmin < cleft || ymin < ctop
        !           106:                        || (xmin + xsize) > (cleft + cwidth)
        !           107:                        || (ymin + ysize) > (ctop + cheight)) {
        !           108:                        /* Its clipped - we lose */
        !           109:                        region = pr_region(PixRect, cleft, ctop, cwidth, cheight);      /* XXX - slow!!! */
        !           110:                        pr_vector(region, xo - cleft, yo - ctop, xp - cleft, yp - ctop, op, srcpix);
        !           111:                        pr_destroy(region);
        !           112:                    }
        !           113:                    else {
        !           114:                        /* It isnt clipped */
        !           115:                        pr_vector(PixRect, xo, yo, xp, yp, op, srcpix);
        !           116:                    }
        !           117:                }
        !           118:            }
        !           119:            v++;
        !           120:        } while (--vc > 0);
        !           121:     } while (--clipcount > 0);
        !           122:     RestoreCursor();
        !           123:     SetZmask(PixRect, &allmask);
        !           124: }
        !           125: 
        !           126: DrawCurve (verts, vertcount, xbase, ybase, srcpix, altpix, mode,
        !           127:           bwidth, bheight, pat, patlen, patmul, clips, clipcount, func, zmask)
        !           128:        Vertex *verts;
        !           129:        int vertcount, xbase, ybase, srcpix, altpix, mode, bwidth, bheight;
        !           130:        int pat, patlen, patmul, clipcount, zmask;
        !           131:        register int func;
        !           132:        CLIP *clips;
        !           133: {
        !           134:     int op = SUN_FROM_X_OP(func);
        !           135:     if (bwidth == 1 && bheight == 1)
        !           136:        switch (mode) {
        !           137:            /* XXX - ignores dash/pattern for now */
        !           138:        case DrawSolidLine:
        !           139:            Draw_Solid(srcpix, xbase, ybase, op,
        !           140:                       vertcount, verts, clipcount, clips, zmask);
        !           141:            break;
        !           142:        case DrawDashedLine:
        !           143:            Draw_Solid(srcpix, xbase, ybase, op,
        !           144:                       vertcount, verts, clipcount, clips, zmask);
        !           145:            break;
        !           146:        case DrawPatternedLine:
        !           147:            Draw_Solid(srcpix, xbase, ybase, op,
        !           148:                       vertcount, verts, clipcount, clips, zmask);
        !           149:            break;
        !           150:        }
        !           151:     else
        !           152:        switch (mode) {
        !           153:            /* XXX - ignores brush specification for now */
        !           154:        case DrawSolidLine:
        !           155:            Draw_Solid(srcpix, xbase, ybase, op,
        !           156:                       vertcount, verts, clipcount, clips, zmask);
        !           157:            break;
        !           158:        case DrawDashedLine:
        !           159:            Draw_Solid(srcpix, xbase, ybase, op,
        !           160:                       vertcount, verts, clipcount, clips, zmask);
        !           161:            break;
        !           162:        case DrawPatternedLine:
        !           163:            Draw_Solid(srcpix, xbase, ybase, op,
        !           164:                       vertcount, verts, clipcount, clips, zmask);
        !           165:            break;
        !           166:        }
        !           167: }
        !           168: #endif sun

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