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authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
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tree2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/programs/Xserver/Xprint/pcl/PclLine.c
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
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+/* $Xorg: PclLine.c,v 1.3 2000/08/17 19:48:08 cpqbld Exp $ */
+/*******************************************************************
+**
+** *********************************************************
+** *
+** * File: PclLine.c
+** *
+** * Contents:
+** * Line drawing routines for the PCL driver
+** *
+** * Created: 10/11/95
+** *
+** *********************************************************
+**
+********************************************************************/
+/*
+(c) Copyright 1996 Hewlett-Packard Company
+(c) Copyright 1996 International Business Machines Corp.
+(c) Copyright 1996 Sun Microsystems, Inc.
+(c) Copyright 1996 Novell, Inc.
+(c) Copyright 1996 Digital Equipment Corp.
+(c) Copyright 1996 Fujitsu Limited
+(c) Copyright 1996 Hitachi, Ltd.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the names of the copyright holders shall
+not be used in advertising or otherwise to promote the sale, use or other
+dealings in this Software without prior written authorization from said
+copyright holders.
+*/
+/* $XFree86: xc/programs/Xserver/Xprint/pcl/PclLine.c,v 1.6 1999/12/13 02:12:55 robin Exp $ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include "Pcl.h"
+#include "gcstruct.h"
+#include "windowstr.h"
+
+/*
+ * PclPolyLine()
+ * PclPolySegment()
+ *
+ * Generates PCL code to draw a polyline, or a collection of distinct
+ * line segments, clipped by the current clip region. Since PCL
+ * supports clipping to a rectangle, and the clip region is
+ * represented as a collection of visible rectangles, we can draw and
+ * clip the line by repeatedly drawing the complete line, clipped to
+ * each rectangle in the clip region.
+ *
+ * Since each box in the clipping region generates approximately 30
+ * bytes of PCL code, we have to have a way to avoid having a large
+ * number of boxes. The worst problem the case where the clipping
+ * region is a collection of one-pixel-high boxes, perhaps arising
+ * from a bitmap clip mask, or a region defined by a non-rectangular
+ * polygon.
+ *
+ * To alleviate this problem, we create a second clipping region,
+ * which consists of the union of the bounding boxes of each line
+ * segment. (Each bounding box is also increased by some amount
+ * related to the current line width to allow for non-zero-width
+ * lines, and for the various end and join styles.) This region is
+ * intersected with the "real" clipping region to get the region used
+ * to actually clip the polyline. This should result in a significant
+ * reduction in the number of clip rectangles, as the region-handling
+ * code should consolidate many of the fragments of one-pixel-high
+ * rectangles into larger rectangles.
+ */
+
+void
+PclPolyLine(
+ DrawablePtr pDrawable,
+ GCPtr pGC,
+ int mode,
+ int nPoints,
+ xPoint *pPoints)
+{
+ char t[80];
+ FILE *outFile;
+ int xoffset = 0, yoffset = 0;
+ int nbox;
+ BoxPtr pbox;
+ xRectangle *drawRects, *r;
+ RegionPtr drawRegion, region;
+ short fudge;
+ int i;
+ XpContextPtr pCon;
+ PclContextPrivPtr pConPriv;
+
+ if( PclUpdateDrawableGC( pGC, pDrawable, &outFile ) == FALSE )
+ return;
+
+ pCon = PclGetContextFromWindow( (WindowPtr) pDrawable );
+ pConPriv = (PclContextPrivPtr)
+ pCon->devPrivates[PclContextPrivateIndex].ptr;
+
+ /*
+ * Allocate the storage required to deal with the clipping
+ * regions.
+ */
+ region = REGION_CREATE( pGC->pScreen, NULL, 0 );
+ drawRects = (xRectangle *)
+ xalloc( ( nPoints - 1 ) * sizeof( xRectangle ) );
+
+ /*
+ * Calculate the "fudge factor" based on the line width.
+ * Multiplying by three seems to be a good first guess.
+ * XXX I need to think of a way to test this.
+ */
+ fudge = 3 * pGC->lineWidth + 1;
+
+ /*
+ * Generate the PCL code to draw the polyline, by defining it as a
+ * macro which uses the HP-GL/2 line drawing function.
+ */
+
+ MACRO_START( outFile, pConPriv );
+ SAVE_PCL( outFile, pConPriv, "\033%0B" );
+
+ sprintf( t, "PU%d,%dPD\n", pPoints[0].x + pDrawable->x,
+ pPoints[0].y + pDrawable->y );
+ SAVE_PCL( outFile, pConPriv, t ); /* Move to the start of the polyline */
+
+ switch( mode )
+ {
+ case CoordModeOrigin:
+ xoffset = pDrawable->x;
+ yoffset = pDrawable->y;
+ SAVE_PCL( outFile, pConPriv, "PA" );
+ break;
+ case CoordModePrevious:
+ xoffset = yoffset = 0;
+ SAVE_PCL( outFile, pConPriv, "PR" );
+ break;
+ }
+
+ /*
+ * Build the "drawing region" as we build the PCL to draw the
+ * line.
+ */
+ for(i = 1, r = drawRects; i < nPoints; i++, r++ )
+ {
+ if( i != 1 )
+ SAVE_PCL( outFile, pConPriv, "," );
+
+ sprintf( t, "%d,%d", pPoints[i].x + xoffset,
+ pPoints[i].y + yoffset );
+ SAVE_PCL( outFile, pConPriv, t );
+
+ r->x = MIN( pPoints[i-1].x, pPoints[i].x ) + xoffset - fudge;
+ r->y = MIN( pPoints[i-1].y, pPoints[i].y ) + yoffset - fudge;
+ r->width = abs( pPoints[i-1].x - pPoints[i].x ) + 2 * fudge;
+ r->height = abs( pPoints[i-1].y - pPoints[i].y ) + 2 * fudge;
+ }
+ SAVE_PCL( outFile, pConPriv, ";\033%0A" ); /* End the macro */
+ MACRO_END( outFile );
+
+ /*
+ * Convert the collection of rectangles into a proper region, then
+ * intersect it with the clip region.
+ */
+ drawRegion = RECTS_TO_REGION( pGC->pScreen, nPoints - 1,
+ drawRects, CT_UNSORTED );
+ if( mode == CoordModePrevious )
+ REGION_TRANSLATE( pGC->pScreen, drawRegion, pPoints[0].x, pPoints[0].y );
+ REGION_INTERSECT( pGC->pScreen, region, drawRegion, pGC->pCompositeClip );
+
+ /*
+ * For each rectangle in the clip region, set the HP-GL/2 "input
+ * window" and render the entire polyline to it.
+ */
+ pbox = REGION_RECTS( region );
+ nbox = REGION_NUM_RECTS( region );
+
+ PclSendData(outFile, pConPriv, pbox, nbox, 1.0);
+
+ /*
+ * Clean up the temporary regions
+ */
+ REGION_DESTROY( pGC->pScreen, drawRegion );
+ REGION_DESTROY( pGC->pScreen, region );
+ xfree( drawRects );
+}
+
+void
+PclPolySegment(
+ DrawablePtr pDrawable,
+ GCPtr pGC,
+ int nSegments,
+ xSegment *pSegments)
+{
+ FILE *outFile, *dummy;
+ char t[80];
+ int xoffset, yoffset;
+ int nbox, i;
+ unsigned long valid;
+ BoxPtr pbox;
+ xRectangle *drawRects, *r;
+ RegionPtr drawRegion, region;
+ short fudge;
+ XpContextPtr pCon;
+ PclContextPrivPtr pConPriv;
+ GC cacheGC;
+
+
+ if( PclUpdateDrawableGC( pGC, pDrawable, &outFile ) == FALSE )
+ return;
+
+ pCon = PclGetContextFromWindow( (WindowPtr) pDrawable );
+ pConPriv = (PclContextPrivPtr)
+ pCon->devPrivates[PclContextPrivateIndex].ptr;
+
+ /*
+ * Allocate the storage for the temporary regions.
+ */
+ region = REGION_CREATE( pGC->pScreen, NULL, 0 );
+ drawRects = (xRectangle *)
+ xalloc( nSegments * sizeof( xRectangle ) );
+
+ /*
+ * Calculate the fudge factor, based on the line width
+ */
+ fudge = pGC->lineWidth * 3 + 1;
+
+ /*
+ * Turn off line joining.
+ */
+ SEND_PCL( outFile, "\033%0BLA2,6;\033%0A" );
+
+ /*
+ * Generate the PCL code to draw the segments, by defining them as
+ * a macro which uses the HP-GL/2 line drawing function.
+ *
+ * XXX I wonder if this should be implemented using the Encoded
+ * XXX Polyline function. Since I'm only sending it once, it's not
+ * XXX necessarily too important.
+ */
+
+ MACRO_START( outFile, pConPriv );
+ SAVE_PCL( outFile, pConPriv, "\033%0B" );
+
+ xoffset = pDrawable->x;
+ yoffset = pDrawable->y;
+
+ for( i = 0, r = drawRects; i < nSegments; i++, r++ )
+ {
+ r->x = MIN( pSegments[i].x1, pSegments[i].x2 ) + xoffset;
+ r->y = MIN( pSegments[i].y1, pSegments[i].y2 ) + yoffset;
+ r->width = abs( pSegments[i].x1 - pSegments[i].x2 );
+ r->height = abs( pSegments[i].y1 - pSegments[i].y2 );
+
+ sprintf( t, "PU%d,%d;PD%d,%d;", pSegments[i].x1 + xoffset,
+ pSegments[i].y1 + yoffset, pSegments[i].x2 +
+ xoffset, pSegments[i].y2 + yoffset );
+ SAVE_PCL( outFile, pConPriv, t );
+
+ r->x -= fudge;
+ r->y -= fudge;
+ r->width += 2 * fudge;
+ r->height += 2 * fudge;
+ }
+ SAVE_PCL( outFile, pConPriv, "\033%0A" );
+ MACRO_END ( outFile );
+
+ /*
+ * Convert the collection of rectangles into a proper region, then
+ * intersect it with the clip region.
+ */
+ drawRegion = RECTS_TO_REGION( pGC->pScreen, nSegments,
+ drawRects, CT_UNSORTED );
+ REGION_INTERSECT( pGC->pScreen, region, drawRegion, pGC->pCompositeClip );
+
+ /*
+ * For each rectangle in the clip region, set the HP-GL/2 "input
+ * window" and render the entire set of segments to it.
+ */
+ pbox = REGION_RECTS( region );
+ nbox = REGION_NUM_RECTS( region );
+
+ PclSendData(outFile, pConPriv, pbox, nbox, 1.0);
+
+ /*
+ * Now we need to reset the line join mode to whatever it was at before.
+ * The easiest way is to force the cached GC's joinstyle to be different
+ * from the current GC's joinstyle, then re-update the GC. This way, we
+ * don't have to duplicate code unnecessarily.
+ */
+ PclGetDrawablePrivateStuff( pDrawable, &cacheGC, &valid, &dummy );
+ cacheGC.joinStyle = !cacheGC.joinStyle;
+ PclSetDrawablePrivateGC( pDrawable, cacheGC );
+ PclUpdateDrawableGC( pGC, pDrawable, &outFile );
+
+ /*
+ * Clean up
+ */
+ REGION_DESTROY( pGC->pScreen, drawRegion );
+ REGION_DESTROY( pGC->pScreen, region );
+ xfree( drawRects );
+}