xorg-server-1.4/hw/xfree86/xaa/xaaLineMisc.c

   1
   2 #ifdef HAVE_XORG_CONFIG_H
   3 #include <xorg-config.h>
   4 #endif
   5
   6 #include "misc.h"
   7 #include "xf86.h"
   8 #include "xf86_OSproc.h"
   9
  10 #include <X11/X.h>
  11 #include "scrnintstr.h"
  12 #include "miline.h"
  13 #include "xf86str.h"
  14 #include "xaa.h"
  15 #include "xaalocal.h"
  16
  17
  18 void
  19 XAASolidHorVertLineAsRects(
  20    ScrnInfoPtr pScrn,
  21    int x, int y, int len, int dir
  22 ){
  23     XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);
  24
  25     if(dir == DEGREES_0)
  26         (*infoRec->SubsequentSolidFillRect)(pScrn, x, y, len, 1);
  27     else
  28         (*infoRec->SubsequentSolidFillRect)(pScrn, x, y, 1, len);
  29 }
  30
  31
  32 void
  33 XAASolidHorVertLineAsTwoPoint(
  34    ScrnInfoPtr pScrn,
  35    int x, int y, int len, int dir
  36 ){
  37     XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);
  38
  39     len--;
  40
  41     if(dir == DEGREES_0)
  42         (*infoRec->SubsequentSolidTwoPointLine)(pScrn, x, y, x + len, y, 0);
  43     else
  44         (*infoRec->SubsequentSolidTwoPointLine)(pScrn, x, y, x, y + len, 0);
  45 }
  46
  47 void
  48 XAASolidHorVertLineAsBresenham(
  49    ScrnInfoPtr pScrn,
  50    int x, int y, int len, int dir
  51 ){
  52     XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);
  53
  54     if(dir == DEGREES_0)
  55         (*infoRec->SubsequentSolidBresenhamLine)(
  56                 pScrn, x, y, len << 1, 0, -len, len, 0);
  57     else
  58         (*infoRec->SubsequentSolidBresenhamLine)(
  59                 pScrn, x, y, len << 1, 0, -len, len, YMAJOR);
  60 }
  61
  62
  63 void
  64 XAAComputeDash(GCPtr pGC)
  65 {
  66     XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_GC(pGC);
  67     XAAGCPtr   pGCPriv = (XAAGCPtr) (pGC)->devPrivates[XAAGetGCIndex()].ptr;
  68     Bool EvenDash = (pGC->numInDashList & 0x01) ? FALSE : TRUE;
  69     int PatternLength = 0;
  70     unsigned char* DashPtr = (unsigned char*)pGC->dash;
  71     CARD32 *ptr;
  72     int count = pGC->numInDashList;
  73     int shift, value, direction;
  74     Bool set;
  75
  76     if(pGCPriv->DashPattern)
  77         xfree(pGCPriv->DashPattern);
  78
  79     pGCPriv->DashPattern = NULL;
  80     pGCPriv->DashLength = 0;
  81
  82     while(count--)
  83         PatternLength += *(DashPtr++);
  84
  85     if(!EvenDash)
  86         PatternLength <<= 1;
  87
  88     if(PatternLength > infoRec->DashPatternMaxLength)
  89         return;
  90
  91     if((infoRec->DashedLineFlags & LINE_PATTERN_POWER_OF_2_ONLY) &&
  92                                 (PatternLength & (PatternLength - 1)))
  93         return;
  94
  95     pGCPriv->DashPattern = xcalloc((PatternLength + 31) >> 5, 4);
  96     if(!pGCPriv->DashPattern) return;
  97     pGCPriv->DashLength = PatternLength;
  98
  99     if(infoRec->DashedLineFlags & (LINE_PATTERN_LSBFIRST_MSBJUSTIFIED |
 100                                    LINE_PATTERN_LSBFIRST_LSBJUSTIFIED)) {
 101         direction = 1;
 102         set = TRUE;
 103         DashPtr = (unsigned char*)pGC->dash;
 104     } else {
 105         direction = -1;
 106         set = FALSE;
 107         DashPtr = (unsigned char*)pGC->dash + pGC->numInDashList - 1;
 108     }
 109
 110     if(infoRec->DashedLineFlags & (LINE_PATTERN_LSBFIRST_MSBJUSTIFIED |
 111                                    LINE_PATTERN_MSBFIRST_MSBJUSTIFIED))
 112         shift = 32 - (PatternLength & 31);
 113     else
 114         shift = 0;
 115
 116     ptr = (CARD32*)(pGCPriv->DashPattern);
 117
 118 CONCATENATE:
 119
 120     count = pGC->numInDashList;
 121
 122     while(count--) {
 123         value = *DashPtr;
 124         DashPtr += direction;
 125         while(value) {
 126             if(value < (32 - shift)) {
 127                 if(set) *ptr |= XAAShiftMasks[value] << shift;
 128                 shift += value;
 129                 break;
 130              } else {
 131                 if(set) *ptr |= ~0L << shift;
 132                 value -= (32 - shift);
 133                 shift = 0;
 134                 ptr++;
 135              }
 136         }
 137         if(set) set = FALSE;
 138         else set = TRUE;
 139     }
 140
 141     if(!EvenDash) {
 142         EvenDash = TRUE;
 143         if(infoRec->DashedLineFlags & (LINE_PATTERN_LSBFIRST_MSBJUSTIFIED |
 144                                        LINE_PATTERN_LSBFIRST_LSBJUSTIFIED))
 145            DashPtr = (unsigned char*)pGC->dash;
 146         else
 147            DashPtr = (unsigned char*)pGC->dash + pGC->numInDashList;
 148         goto CONCATENATE;
 149     }
 150 }