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Annotation of 43BSDTahoe/new/X/libibm/libsrc/tile.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char *rcsid_tile_c = "$Header: tile.c,v 10.1 86/11/19 10:44:34 jg Exp $";
        !             3: #endif lint
        !             4: /* Copyright 1985 Massachusetts Institute of Technology */
        !             5: 
        !             6: /* tile.c - Perform a raster operation involving a pattern
        !             7:  *
        !             8:  *      TileFill        Patterns a portion of the screen
        !             9:  *      DrawFilled      Draw a filled generalized line/polygon/combination
        !            10:  *     AlignTile       Aligns tile to a given coordinates
        !            11:  *
        !            12:  *     Changes and modifications by:
        !            13:  *
        !            14:  *             Scott Bates
        !            15:  *             Brown University
        !            16:  *             IRIS, Box 1946
        !            17:  *             Providence, RI 02912
        !            18:  *
        !            19:  *
        !            20:  *             Copyright (c) 1986 Brown University
        !            21:  *
        !            22:  * Permission to use, copy, modify and distribute this software and its
        !            23:  * documentation for any purpose and without fee is hereby granted, provided
        !            24:  * that the above copyright notice appear in all copies, and that both
        !            25:  * that copyright notice and this permission notice appear in supporting
        !            26:  * documentation, and that the name of Brown University not be used in
        !            27:  * advertising or publicity pertaining to distribution of the software
        !            28:  * without specific, written prior permission. Brown University makes no
        !            29:  * representations about the suitability of this software for any purpose.
        !            30:  * It is provided "as-is" without express or implied warranty.
        !            31:  */
        !            32: 
        !            33: #include "private.h"
        !            34: #include "bitblt.h"
        !            35: 
        !            36: /*
        !            37:  * Tile area of screen using a mask
        !            38:  */
        !            39: 
        !            40: /*ARGSUSED*/
        !            41: TileFill (tile, xoff, yoff, xymask, dstx, dsty, width, height,
        !            42:           clips, clipcount, func, zmask)
        !            43:         register PIXMAP *tile;
        !            44:         register BITMAP *xymask;
        !            45:        register width, height;
        !            46:         int xoff, yoff, dstx, dsty, zmask;
        !            47:         register func;
        !            48:         CLIP *clips;
        !            49: {
        !            50:        u_short *clipmask = NILMASK;
        !            51:         register BITMAP *bm = (BITMAP *) tile->data;
        !            52:        register u_short *tilepattern;
        !            53:        u_short newtilepattern[TILE_SIZE];
        !            54: 
        !            55: #ifdef TRACE_X
        !            56:        fprintf(stderr, "In TileFill\n");
        !            57:        fflush(stderr);
        !            58: #endif TRACE_X
        !            59: 
        !            60:        /*
        !            61:         * There better be at least one plane
        !            62:         */
        !            63: 
        !            64:         if ((zmask & 1) == 0)
        !            65:                return;
        !            66: 
        !            67:        /*
        !            68:          * If pixmap needs to be inverted before being displayed
        !            69:          * remap funtion to reflect this change.
        !            70:          */
        !            71: 
        !            72:                func = SSMap[func | (tile->kind & InvertFlag)];
        !            73: 
        !            74:        /*
        !            75:          * Get tile. If pixmap has no associated bitmap then pixmap
        !            76:          * struct contains pointer to constant tile. Otherwise, it
        !            77:          * contains pointer to bitmap which points to the tile.
        !            78:          */
        !            79: 
        !            80:         if (PTYPE(tile) == ConstantPixmap) {
        !            81:                tilepattern = (u_short *) tile->data;
        !            82:         } else {
        !            83:                tilepattern = (u_short *) bm->data;
        !            84: 
        !            85:                /*
        !            86:                 * Align tile to offset supplied
        !            87:                 */
        !            88: 
        !            89:                if ((xoff | yoff) & 0x0F) {
        !            90:                        AlignTile(tilepattern, newtilepattern, xoff, yoff);
        !            91:                        tilepattern = newtilepattern;
        !            92:                }
        !            93:        }
        !            94: 
        !            95:        /*
        !            96:         * Clip xymask and destnation rectangle to minimum size
        !            97:         */
        !            98: 
        !            99:        if(xymask) {
        !           100:                width = MIN (xymask->width, width);
        !           101:                height = MIN (xymask->height, height);
        !           102:                clipmask = (u_short *) xymask->data;
        !           103:        }
        !           104: 
        !           105:        /*
        !           106:          * Fill in destination rectangle
        !           107:          */
        !           108: 
        !           109:        FillInRect(dstx, dsty, width, height, &DstRect);
        !           110: 
        !           111:        /*
        !           112:          * Tile area of screen using a mask
        !           113:          */
        !           114: 
        !           115:        CopyBits (tilepattern, NIL, NIL, NILRECT, 
        !           116:                  (u_short *) pbm.data, pbm.width, pbm.height, &DstRect,
        !           117:                  clipmask, width, height, MAKE_TILE_RULE(func),
        !           118:                  clipcount, clips);
        !           119: }
        !           120: 
        !           121: /*
        !           122:  * Draw a filled generalized line/polygon/combination
        !           123:  */
        !           124: 
        !           125: /*ARGSUSED*/
        !           126: DrawFilled (verts, vertcount, xbase, ybase, srcpix, tile, xoff, yoff,
        !           127:             clips, clipcount, func, zmask)
        !           128:         Vertex *verts;
        !           129:         register PIXMAP *tile;
        !           130:         int vertcount, xbase, ybase, srcpix, xoff, yoff, clipcount, zmask;
        !           131:         int func;
        !           132:         CLIP *clips;
        !           133: {
        !           134:        BITMAP *xymask;
        !           135:        Vertex *newverts;
        !           136:        int newvertcount;
        !           137: 
        !           138: #ifdef TRACE_X
        !           139:        fprintf(stderr, "In DrawFilled\n");
        !           140:        fflush(stderr);
        !           141: #endif TRACE_X
        !           142: 
        !           143:        /*
        !           144:         * Limit draw operation to one plane
        !           145:         */
        !           146: 
        !           147:         if ((zmask & 1) == 0 || vertcount < 2)
        !           148:                return;
        !           149: 
        !           150:        /*
        !           151:         * Convert path list to absolute line segments
        !           152:         */
        !           153: 
        !           154:        if(PathListConverter(verts, vertcount, xbase, ybase, &newverts,
        !           155:           &newvertcount, FILL_PATH_LIST) == NULL) {
        !           156:                DeviceError("DrawCurve failure in PathListConverter()\n");
        !           157:                return;
        !           158:        }
        !           159: 
        !           160:        /*
        !           161:         * Make mask for polygon fill
        !           162:         */
        !           163: 
        !           164:        if((xymask = MakeMask(newverts, newvertcount)) == NULL) {
        !           165:                DeviceError("DrawFilled failure in MakeMask()\n");
        !           166:                return;
        !           167:        }
        !           168: 
        !           169:        /*
        !           170:         * Fill the polygon
        !           171:         */
        !           172: 
        !           173:        if(tile) {
        !           174:                /*
        !           175:                 * Tile fill the polygon using the mask
        !           176:                 */
        !           177: 
        !           178:                TileFill(tile, xoff, yoff, xymask, 0, 0, xymask->width,
        !           179:                         xymask->height, clips, clipcount, func, zmask);
        !           180:        } else  {
        !           181:                /*
        !           182:                 * Pix fill the polygon using the mask
        !           183:                 */
        !           184: 
        !           185:                PixFill(srcpix, xymask, 0, 0, xymask->width, xymask->height,
        !           186:                        clips, clipcount, func, zmask);
        !           187:        }
        !           188: 
        !           189:        /*
        !           190:         * Free mask BITMAP and space used by converted vertex list
        !           191:         */
        !           192: 
        !           193:        FreeBitmap(xymask);
        !           194:        free((caddr_t)newverts);
        !           195: }
        !           196: 
        !           197: /*
        !           198:  * Align tile to offset provided.
        !           199:  * Note: tile is in IBM bit order not VAX
        !           200:  */
        !           201: 
        !           202: static
        !           203: AlignTile(src, dst, xoff, yoff)
        !           204:        register u_short *src, *dst;
        !           205:        register int xoff, yoff;
        !           206: {
        !           207:        register int i;
        !           208:        register int shift;
        !           209:        u_short mask;
        !           210: 
        !           211: #ifdef TRACE_X
        !           212:        fprintf(stderr, "In Align_Tile\n");
        !           213:        fflush(stderr);
        !           214: #endif TRACE_X
        !           215: 
        !           216:        xoff &= 0x0F;
        !           217:        yoff = (TILE_HEIGHT - (yoff & 0x0F)) & 0x0F;
        !           218:        shift = (TILE_WIDTH - xoff) & 0x0F;
        !           219:        mask = (1 << xoff) - 1;
        !           220: 
        !           221:        for (i = 0; i < TILE_HEIGHT; i++) {
        !           222:                dst[i] = (src[yoff] >> xoff) | ((src[yoff] & mask) << shift);
        !           223:                yoff++;
        !           224:                yoff &= 0x0F;
        !           225:        }
        !           226: }

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