315 lines
10 KiB
C
315 lines
10 KiB
C
/*******************************************************************
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**
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** *********************************************************
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** *
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** * File: PclLine.c
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** *
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** * Contents:
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** * Line drawing routines for the PCL driver
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** *
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** * Created: 10/11/95
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** *
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** *********************************************************
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**
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********************************************************************/
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/*
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(c) Copyright 1996 Hewlett-Packard Company
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(c) Copyright 1996 International Business Machines Corp.
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(c) Copyright 1996 Sun Microsystems, Inc.
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(c) Copyright 1996 Novell, Inc.
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(c) Copyright 1996 Digital Equipment Corp.
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(c) Copyright 1996 Fujitsu Limited
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(c) Copyright 1996 Hitachi, Ltd.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the names of the copyright holders shall
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not be used in advertising or otherwise to promote the sale, use or other
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dealings in this Software without prior written authorization from said
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copyright holders.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include "Pcl.h"
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#include "gcstruct.h"
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#include "windowstr.h"
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/*
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* PclPolyLine()
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* PclPolySegment()
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*
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* Generates PCL code to draw a polyline, or a collection of distinct
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* line segments, clipped by the current clip region. Since PCL
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* supports clipping to a rectangle, and the clip region is
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* represented as a collection of visible rectangles, we can draw and
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* clip the line by repeatedly drawing the complete line, clipped to
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* each rectangle in the clip region.
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*
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* Since each box in the clipping region generates approximately 30
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* bytes of PCL code, we have to have a way to avoid having a large
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* number of boxes. The worst problem the case where the clipping
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* region is a collection of one-pixel-high boxes, perhaps arising
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* from a bitmap clip mask, or a region defined by a non-rectangular
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* polygon.
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*
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* To alleviate this problem, we create a second clipping region,
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* which consists of the union of the bounding boxes of each line
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* segment. (Each bounding box is also increased by some amount
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* related to the current line width to allow for non-zero-width
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* lines, and for the various end and join styles.) This region is
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* intersected with the "real" clipping region to get the region used
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* to actually clip the polyline. This should result in a significant
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* reduction in the number of clip rectangles, as the region-handling
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* code should consolidate many of the fragments of one-pixel-high
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* rectangles into larger rectangles.
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*/
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void
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PclPolyLine(
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DrawablePtr pDrawable,
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GCPtr pGC,
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int mode,
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int nPoints,
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xPoint *pPoints)
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{
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char t[80];
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FILE *outFile;
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int xoffset = 0, yoffset = 0;
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int nbox;
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BoxPtr pbox;
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xRectangle *drawRects, *r;
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RegionPtr drawRegion, region;
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short fudge;
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int i;
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XpContextPtr pCon;
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PclContextPrivPtr pConPriv;
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if( PclUpdateDrawableGC( pGC, pDrawable, &outFile ) == FALSE )
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return;
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pCon = PclGetContextFromWindow( (WindowPtr) pDrawable );
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pConPriv = (PclContextPrivPtr)
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pCon->devPrivates[PclContextPrivateIndex].ptr;
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/*
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* Allocate the storage required to deal with the clipping
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* regions.
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*/
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region = REGION_CREATE( pGC->pScreen, NULL, 0 );
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drawRects = (xRectangle *)
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xalloc( ( nPoints - 1 ) * sizeof( xRectangle ) );
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/*
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* Calculate the "fudge factor" based on the line width.
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* Multiplying by three seems to be a good first guess.
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* XXX I need to think of a way to test this.
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*/
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fudge = 3 * pGC->lineWidth + 1;
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/*
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* Generate the PCL code to draw the polyline, by defining it as a
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* macro which uses the HP-GL/2 line drawing function.
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*/
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MACRO_START( outFile, pConPriv );
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SAVE_PCL( outFile, pConPriv, "\033%0B" );
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sprintf( t, "PU%d,%dPD\n", pPoints[0].x + pDrawable->x,
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pPoints[0].y + pDrawable->y );
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SAVE_PCL( outFile, pConPriv, t ); /* Move to the start of the polyline */
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switch( mode )
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{
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case CoordModeOrigin:
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xoffset = pDrawable->x;
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yoffset = pDrawable->y;
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SAVE_PCL( outFile, pConPriv, "PA" );
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break;
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case CoordModePrevious:
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xoffset = yoffset = 0;
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SAVE_PCL( outFile, pConPriv, "PR" );
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break;
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}
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/*
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* Build the "drawing region" as we build the PCL to draw the
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* line.
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*/
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for(i = 1, r = drawRects; i < nPoints; i++, r++ )
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{
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if( i != 1 )
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SAVE_PCL( outFile, pConPriv, "," );
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sprintf( t, "%d,%d", pPoints[i].x + xoffset,
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pPoints[i].y + yoffset );
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SAVE_PCL( outFile, pConPriv, t );
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r->x = MIN( pPoints[i-1].x, pPoints[i].x ) + xoffset - fudge;
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r->y = MIN( pPoints[i-1].y, pPoints[i].y ) + yoffset - fudge;
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r->width = abs( pPoints[i-1].x - pPoints[i].x ) + 2 * fudge;
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r->height = abs( pPoints[i-1].y - pPoints[i].y ) + 2 * fudge;
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}
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SAVE_PCL( outFile, pConPriv, ";\033%0A" ); /* End the macro */
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MACRO_END( outFile );
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/*
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* Convert the collection of rectangles into a proper region, then
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* intersect it with the clip region.
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*/
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drawRegion = RECTS_TO_REGION( pGC->pScreen, nPoints - 1,
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drawRects, CT_UNSORTED );
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if( mode == CoordModePrevious )
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REGION_TRANSLATE( pGC->pScreen, drawRegion, pPoints[0].x, pPoints[0].y );
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REGION_INTERSECT( pGC->pScreen, region, drawRegion, pGC->pCompositeClip );
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/*
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* For each rectangle in the clip region, set the HP-GL/2 "input
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* window" and render the entire polyline to it.
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*/
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pbox = REGION_RECTS( region );
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nbox = REGION_NUM_RECTS( region );
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PclSendData(outFile, pConPriv, pbox, nbox, 1.0);
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/*
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* Clean up the temporary regions
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*/
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REGION_DESTROY( pGC->pScreen, drawRegion );
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REGION_DESTROY( pGC->pScreen, region );
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xfree( drawRects );
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}
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void
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PclPolySegment(
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DrawablePtr pDrawable,
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GCPtr pGC,
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int nSegments,
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xSegment *pSegments)
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{
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FILE *outFile, *dummy;
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char t[80];
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int xoffset, yoffset;
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int nbox, i;
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unsigned long valid;
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BoxPtr pbox;
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xRectangle *drawRects, *r;
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RegionPtr drawRegion, region;
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short fudge;
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XpContextPtr pCon;
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PclContextPrivPtr pConPriv;
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GC cacheGC;
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if( PclUpdateDrawableGC( pGC, pDrawable, &outFile ) == FALSE )
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return;
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pCon = PclGetContextFromWindow( (WindowPtr) pDrawable );
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pConPriv = (PclContextPrivPtr)
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pCon->devPrivates[PclContextPrivateIndex].ptr;
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/*
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* Allocate the storage for the temporary regions.
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*/
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region = REGION_CREATE( pGC->pScreen, NULL, 0 );
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drawRects = (xRectangle *)
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xalloc( nSegments * sizeof( xRectangle ) );
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/*
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* Calculate the fudge factor, based on the line width
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*/
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fudge = pGC->lineWidth * 3 + 1;
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/*
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* Turn off line joining.
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*/
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SEND_PCL( outFile, "\033%0BLA2,6;\033%0A" );
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/*
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* Generate the PCL code to draw the segments, by defining them as
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* a macro which uses the HP-GL/2 line drawing function.
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*
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* XXX I wonder if this should be implemented using the Encoded
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* XXX Polyline function. Since I'm only sending it once, it's not
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* XXX necessarily too important.
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*/
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MACRO_START( outFile, pConPriv );
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SAVE_PCL( outFile, pConPriv, "\033%0B" );
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xoffset = pDrawable->x;
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yoffset = pDrawable->y;
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for( i = 0, r = drawRects; i < nSegments; i++, r++ )
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{
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r->x = MIN( pSegments[i].x1, pSegments[i].x2 ) + xoffset;
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r->y = MIN( pSegments[i].y1, pSegments[i].y2 ) + yoffset;
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r->width = abs( pSegments[i].x1 - pSegments[i].x2 );
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r->height = abs( pSegments[i].y1 - pSegments[i].y2 );
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sprintf( t, "PU%d,%d;PD%d,%d;", pSegments[i].x1 + xoffset,
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pSegments[i].y1 + yoffset, pSegments[i].x2 +
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xoffset, pSegments[i].y2 + yoffset );
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SAVE_PCL( outFile, pConPriv, t );
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r->x -= fudge;
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r->y -= fudge;
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r->width += 2 * fudge;
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r->height += 2 * fudge;
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}
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SAVE_PCL( outFile, pConPriv, "\033%0A" );
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MACRO_END ( outFile );
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/*
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* Convert the collection of rectangles into a proper region, then
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* intersect it with the clip region.
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*/
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drawRegion = RECTS_TO_REGION( pGC->pScreen, nSegments,
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drawRects, CT_UNSORTED );
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REGION_INTERSECT( pGC->pScreen, region, drawRegion, pGC->pCompositeClip );
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/*
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* For each rectangle in the clip region, set the HP-GL/2 "input
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* window" and render the entire set of segments to it.
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*/
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pbox = REGION_RECTS( region );
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nbox = REGION_NUM_RECTS( region );
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PclSendData(outFile, pConPriv, pbox, nbox, 1.0);
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/*
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* Now we need to reset the line join mode to whatever it was at before.
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* The easiest way is to force the cached GC's joinstyle to be different
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* from the current GC's joinstyle, then re-update the GC. This way, we
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* don't have to duplicate code unnecessarily.
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*/
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PclGetDrawablePrivateStuff( pDrawable, &cacheGC, &valid, &dummy );
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cacheGC.joinStyle = !cacheGC.joinStyle;
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PclSetDrawablePrivateGC( pDrawable, cacheGC );
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PclUpdateDrawableGC( pGC, pDrawable, &outFile );
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/*
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* Clean up
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*/
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REGION_DESTROY( pGC->pScreen, drawRegion );
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REGION_DESTROY( pGC->pScreen, region );
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xfree( drawRects );
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}
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