diff options
Diffstat (limited to 'xorg-server/mi/mizerline.c')
| -rw-r--r-- | xorg-server/mi/mizerline.c | 389 |
1 files changed, 183 insertions, 206 deletions
diff --git a/xorg-server/mi/mizerline.c b/xorg-server/mi/mizerline.c index 7077b5198..90798dbdf 100644 --- a/xorg-server/mi/mizerline.c +++ b/xorg-server/mi/mizerline.c @@ -22,7 +22,6 @@ Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. - Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. All Rights Reserved @@ -98,15 +97,12 @@ SOFTWARE. } void -miZeroLine( - DrawablePtr pDraw, - GCPtr pGC, - int mode, /* Origin or Previous */ - int npt, /* number of points */ - DDXPointPtr pptInit) +miZeroLine(DrawablePtr pDraw, GCPtr pGC, int mode, /* Origin or Previous */ + int npt, /* number of points */ + DDXPointPtr pptInit) { int Nspans, current_y = 0; - DDXPointPtr ppt; + DDXPointPtr ppt; DDXPointPtr pspanInit, spans; int *pwidthInit, *widths, list_len; int xleft, ytop, xright, ybottom; @@ -122,21 +118,20 @@ miZeroLine( int adx, ady; int octant; unsigned int bias = miGetZeroLineBias(pDraw->pScreen); - int e, e1, e2, e3; /* Bresenham error terms */ - int length; /* length of lines == # of pixels on major axis */ + int e, e1, e2, e3; /* Bresenham error terms */ + int length; /* length of lines == # of pixels on major axis */ - xleft = pDraw->x; - ytop = pDraw->y; - xright = pDraw->x + pDraw->width - 1; + xleft = pDraw->x; + ytop = pDraw->y; + xright = pDraw->x + pDraw->width - 1; ybottom = pDraw->y + pDraw->height - 1; - if (!pGC->miTranslate) - { - /* do everything in drawable-relative coordinates */ - xleft = 0; - ytop = 0; - xright -= pDraw->x; - ybottom -= pDraw->y; + if (!pGC->miTranslate) { + /* do everything in drawable-relative coordinates */ + xleft = 0; + ytop = 0; + xright -= pDraw->x; + ybottom -= pDraw->y; } /* it doesn't matter whether we're in drawable or screen coordinates, @@ -144,9 +139,9 @@ miZeroLine( * range of a DDXPointRec component. */ if (xright > MAX_COORDINATE) - xright = MAX_COORDINATE; + xright = MAX_COORDINATE; if (ybottom > MAX_COORDINATE) - ybottom = MAX_COORDINATE; + ybottom = MAX_COORDINATE; /* since we're clipping to the drawable's boundaries & coordinate * space boundaries, we're guaranteed that the larger of width/height @@ -158,24 +153,23 @@ miZeroLine( pspanInit = malloc(list_len * sizeof(DDXPointRec)); pwidthInit = malloc(list_len * sizeof(int)); if (!pspanInit || !pwidthInit) { - free(pspanInit); - free(pwidthInit); - return; + free(pspanInit); + free(pwidthInit); + return; } Nspans = 0; new_span = TRUE; - spans = pspanInit - 1; + spans = pspanInit - 1; widths = pwidthInit - 1; ppt = pptInit; xstart = ppt->x; ystart = ppt->y; - if (pGC->miTranslate) - { - xstart += pDraw->x; - ystart += pDraw->y; + if (pGC->miTranslate) { + xstart += pDraw->x; + ystart += pDraw->y; } - + /* x2, y2, oc2 copied to x1, y1, oc1 at top of loop to simplify * iteration logic */ @@ -184,166 +178,154 @@ miZeroLine( oc2 = 0; MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom); - while (--npt > 0) - { - if (Nspans > 0) - (*pGC->ops->FillSpans)(pDraw, pGC, Nspans, pspanInit, - pwidthInit, FALSE); - Nspans = 0; - new_span = TRUE; - spans = pspanInit - 1; - widths = pwidthInit - 1; - - x1 = x2; - y1 = y2; - oc1 = oc2; - ++ppt; - - x2 = ppt->x; - y2 = ppt->y; - if (pGC->miTranslate && (mode != CoordModePrevious)) - { - x2 += pDraw->x; - y2 += pDraw->y; - } - else if (mode == CoordModePrevious) - { - x2 += x1; - y2 += y1; - } - - oc2 = 0; - MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom); - - CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant); - - if (adx > ady) - { - e1 = ady << 1; - e2 = e1 - (adx << 1); - e = e1 - adx; - length = adx; /* don't draw endpoint in main loop */ - - FIXUP_ERROR(e, octant, bias); - - new_x1 = x1; - new_y1 = y1; - new_x2 = x2; - new_y2 = y2; - pt1_clipped = 0; - pt2_clipped = 0; - - if ((oc1 | oc2) != 0) - { - result = miZeroClipLine(xleft, ytop, xright, ybottom, - &new_x1, &new_y1, &new_x2, &new_y2, - adx, ady, - &pt1_clipped, &pt2_clipped, - octant, bias, oc1, oc2); - if (result == -1) - continue; - - length = abs(new_x2 - new_x1); - - /* if we've clipped the endpoint, always draw the full length - * of the segment, because then the capstyle doesn't matter - */ - if (pt2_clipped) - length++; - - if (pt1_clipped) - { - /* must calculate new error terms */ - clipdx = abs(new_x1 - x1); - clipdy = abs(new_y1 - y1); - e += (clipdy * e2) + ((clipdx - clipdy) * e1); - } - } - - /* draw the segment */ - - x = new_x1; - y = new_y1; - - e3 = e2 - e1; - e = e - e1; - - while (length--) - { - MI_OUTPUT_POINT(x, y); - e += e1; - if (e >= 0) - { - y += signdy; - e += e3; - } - x += signdx; - } - } - else /* Y major line */ - { - e1 = adx << 1; - e2 = e1 - (ady << 1); - e = e1 - ady; - length = ady; /* don't draw endpoint in main loop */ - - SetYMajorOctant(octant); - FIXUP_ERROR(e, octant, bias); - - new_x1 = x1; - new_y1 = y1; - new_x2 = x2; - new_y2 = y2; - pt1_clipped = 0; - pt2_clipped = 0; - - if ((oc1 | oc2) != 0) - { - result = miZeroClipLine(xleft, ytop, xright, ybottom, - &new_x1, &new_y1, &new_x2, &new_y2, - adx, ady, - &pt1_clipped, &pt2_clipped, - octant, bias, oc1, oc2); - if (result == -1) - continue; - - length = abs(new_y2 - new_y1); - - /* if we've clipped the endpoint, always draw the full length - * of the segment, because then the capstyle doesn't matter - */ - if (pt2_clipped) - length++; - - if (pt1_clipped) - { - /* must calculate new error terms */ - clipdx = abs(new_x1 - x1); - clipdy = abs(new_y1 - y1); - e += (clipdx * e2) + ((clipdy - clipdx) * e1); - } - } - - /* draw the segment */ - - x = new_x1; - y = new_y1; - - e3 = e2 - e1; - e = e - e1; - - while (length--) - { - MI_OUTPUT_POINT(x, y); - e += e1; - if (e >= 0) - { - x += signdx; - e += e3; - } - y += signdy; - } - } + while (--npt > 0) { + if (Nspans > 0) + (*pGC->ops->FillSpans) (pDraw, pGC, Nspans, pspanInit, + pwidthInit, FALSE); + Nspans = 0; + new_span = TRUE; + spans = pspanInit - 1; + widths = pwidthInit - 1; + + x1 = x2; + y1 = y2; + oc1 = oc2; + ++ppt; + + x2 = ppt->x; + y2 = ppt->y; + if (pGC->miTranslate && (mode != CoordModePrevious)) { + x2 += pDraw->x; + y2 += pDraw->y; + } + else if (mode == CoordModePrevious) { + x2 += x1; + y2 += y1; + } + + oc2 = 0; + MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom); + + CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant); + + if (adx > ady) { + e1 = ady << 1; + e2 = e1 - (adx << 1); + e = e1 - adx; + length = adx; /* don't draw endpoint in main loop */ + + FIXUP_ERROR(e, octant, bias); + + new_x1 = x1; + new_y1 = y1; + new_x2 = x2; + new_y2 = y2; + pt1_clipped = 0; + pt2_clipped = 0; + + if ((oc1 | oc2) != 0) { + result = miZeroClipLine(xleft, ytop, xright, ybottom, + &new_x1, &new_y1, &new_x2, &new_y2, + adx, ady, + &pt1_clipped, &pt2_clipped, + octant, bias, oc1, oc2); + if (result == -1) + continue; + + length = abs(new_x2 - new_x1); + + /* if we've clipped the endpoint, always draw the full length + * of the segment, because then the capstyle doesn't matter + */ + if (pt2_clipped) + length++; + + if (pt1_clipped) { + /* must calculate new error terms */ + clipdx = abs(new_x1 - x1); + clipdy = abs(new_y1 - y1); + e += (clipdy * e2) + ((clipdx - clipdy) * e1); + } + } + + /* draw the segment */ + + x = new_x1; + y = new_y1; + + e3 = e2 - e1; + e = e - e1; + + while (length--) { + MI_OUTPUT_POINT(x, y); + e += e1; + if (e >= 0) { + y += signdy; + e += e3; + } + x += signdx; + } + } + else { /* Y major line */ + + e1 = adx << 1; + e2 = e1 - (ady << 1); + e = e1 - ady; + length = ady; /* don't draw endpoint in main loop */ + + SetYMajorOctant(octant); + FIXUP_ERROR(e, octant, bias); + + new_x1 = x1; + new_y1 = y1; + new_x2 = x2; + new_y2 = y2; + pt1_clipped = 0; + pt2_clipped = 0; + + if ((oc1 | oc2) != 0) { + result = miZeroClipLine(xleft, ytop, xright, ybottom, + &new_x1, &new_y1, &new_x2, &new_y2, + adx, ady, + &pt1_clipped, &pt2_clipped, + octant, bias, oc1, oc2); + if (result == -1) + continue; + + length = abs(new_y2 - new_y1); + + /* if we've clipped the endpoint, always draw the full length + * of the segment, because then the capstyle doesn't matter + */ + if (pt2_clipped) + length++; + + if (pt1_clipped) { + /* must calculate new error terms */ + clipdx = abs(new_x1 - x1); + clipdy = abs(new_y1 - y1); + e += (clipdx * e2) + ((clipdy - clipdx) * e1); + } + } + + /* draw the segment */ + + x = new_x1; + y = new_y1; + + e3 = e2 - e1; + e = e - e1; + + while (length--) { + MI_OUTPUT_POINT(x, y); + e += e1; + if (e >= 0) { + x += signdx; + e += e3; + } + y += signdy; + } + } } /* only do the capnotlast check on the last segment @@ -351,31 +333,26 @@ miZeroLine( * point is the same as the first point, do not draw it, unless the * line is degenerate */ - if ( (! pt2_clipped) && (pGC->capStyle != CapNotLast) && - (((xstart != x2) || (ystart != y2)) || (ppt == pptInit + 1))) - { - MI_OUTPUT_POINT(x, y); - } + if ((!pt2_clipped) && (pGC->capStyle != CapNotLast) && + (((xstart != x2) || (ystart != y2)) || (ppt == pptInit + 1))) { + MI_OUTPUT_POINT(x, y); + } if (Nspans > 0) - (*pGC->ops->FillSpans)(pDraw, pGC, Nspans, pspanInit, - pwidthInit, FALSE); + (*pGC->ops->FillSpans) (pDraw, pGC, Nspans, pspanInit, + pwidthInit, FALSE); free(pwidthInit); free(pspanInit); } void -miZeroDashLine( - DrawablePtr dst, - GCPtr pgc, - int mode, - int nptInit, /* number of points in polyline */ - DDXPointRec *pptInit /* points in the polyline */ - ) +miZeroDashLine(DrawablePtr dst, GCPtr pgc, int mode, int nptInit, /* number of points in polyline */ + DDXPointRec * pptInit /* points in the polyline */ + ) { /* XXX kludge until real zero-width dash code is written */ pgc->lineWidth = 1; - miWideDash (dst, pgc, mode, nptInit, pptInit); + miWideDash(dst, pgc, mode, nptInit, pptInit); pgc->lineWidth = 0; } |