xref: /xsrc/external/mit/xorg-server.old/dist/hw/xfree86/xaa/xaaLineMisc.c

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include "misc.h"
#include "xf86.h"
#include "xf86_OSproc.h"

#include <X11/X.h>
#include "scrnintstr.h"
#include "miline.h"
#include "xf86str.h"
#include "xaa.h"
#include "xaalocal.h"


void
XAASolidHorVertLineAsRects(
   ScrnInfoPtr pScrn,
   int x, int y, int len, int dir
){
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);

    if(dir == DEGREES_0)
	(*infoRec->SubsequentSolidFillRect)(pScrn, x, y, len, 1);
    else
	(*infoRec->SubsequentSolidFillRect)(pScrn, x, y, 1, len);
}


void
XAASolidHorVertLineAsTwoPoint(
   ScrnInfoPtr pScrn,
   int x, int y, int len, int dir
){
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);

    len--;

    if(dir == DEGREES_0)
	(*infoRec->SubsequentSolidTwoPointLine)(pScrn, x, y, x + len, y, 0);
    else
	(*infoRec->SubsequentSolidTwoPointLine)(pScrn, x, y, x, y + len, 0);
}

void
XAASolidHorVertLineAsBresenham(
   ScrnInfoPtr pScrn,
   int x, int y, int len, int dir
){
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);

    if(dir == DEGREES_0)
	(*infoRec->SubsequentSolidBresenhamLine)(
		pScrn, x, y, len << 1, 0, -len, len, 0);
    else
	(*infoRec->SubsequentSolidBresenhamLine)(
		pScrn, x, y, len << 1, 0, -len, len, YMAJOR);
}


void
XAAComputeDash(GCPtr pGC)
{
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_GC(pGC);
    XAAGCPtr   pGCPriv = (XAAGCPtr)dixLookupPrivate(&pGC->devPrivates,
						    XAAGetGCKey());
    Bool EvenDash = (pGC->numInDashList & 0x01) ? FALSE : TRUE;
    int PatternLength = 0;
    unsigned char* DashPtr = (unsigned char*)pGC->dash;
    CARD32 *ptr;
    int count = pGC->numInDashList;
    int shift, value, direction;
    Bool set;

    free(pGCPriv->DashPattern);

    pGCPriv->DashPattern = NULL;
    pGCPriv->DashLength = 0;

    while(count--)
	PatternLength += *(DashPtr++);

    if(!EvenDash)
	PatternLength <<= 1;

    if(PatternLength > infoRec->DashPatternMaxLength)
	return;

    if((infoRec->DashedLineFlags & LINE_PATTERN_POWER_OF_2_ONLY) &&
				(PatternLength & (PatternLength - 1)))
	return;

    pGCPriv->DashPattern = calloc((PatternLength + 31) >> 5, 4);
    if(!pGCPriv->DashPattern) return;
    pGCPriv->DashLength = PatternLength;

    if(infoRec->DashedLineFlags & (LINE_PATTERN_LSBFIRST_MSBJUSTIFIED |
 	 	 		   LINE_PATTERN_LSBFIRST_LSBJUSTIFIED)) {
	direction = 1;
	set = TRUE;
	DashPtr = (unsigned char*)pGC->dash;
    } else {
	direction = -1;
	set = FALSE;
	DashPtr = (unsigned char*)pGC->dash + pGC->numInDashList - 1;
    }

    if(infoRec->DashedLineFlags & (LINE_PATTERN_LSBFIRST_MSBJUSTIFIED |
 	 	 		   LINE_PATTERN_MSBFIRST_MSBJUSTIFIED))
	shift = 32 - (PatternLength & 31);
    else
	shift = 0;

    ptr = (CARD32*)(pGCPriv->DashPattern);

CONCATENATE:

    count = pGC->numInDashList;

    while(count--) {
	value = *DashPtr;
	DashPtr += direction;
	while(value) {
	    if(value < (32 - shift)) {
		if(set) *ptr |= XAAShiftMasks[value] << shift;
		shift += value;
		break;
	     } else {
		if(set) *ptr |= ~0L << shift;
		value -= (32 - shift);
		shift = 0;
		ptr++;
	     }
	}
	if(set) set = FALSE;
	else set = TRUE;
    }

    if(!EvenDash) {
	EvenDash = TRUE;
	if(infoRec->DashedLineFlags & (LINE_PATTERN_LSBFIRST_MSBJUSTIFIED |
				       LINE_PATTERN_LSBFIRST_LSBJUSTIFIED))
	   DashPtr = (unsigned char*)pGC->dash;
	else
	   DashPtr = (unsigned char*)pGC->dash + pGC->numInDashList;
	goto CONCATENATE;
    }
}