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Elliot Lee
332
gdk/linux-fb/mizerline.c
Normal file
332
gdk/linux-fb/mizerline.c
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/* $XFree86: xc/programs/Xserver/mi/mizerline.c,v 3.4 1999/10/14 04:43:16 dawes Exp $ */
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/***********************************************************
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Copyright 1987, 1998 The Open Group
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All Rights Reserved.
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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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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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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 name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/* $TOG: mizerline.c /main/18 1998/02/09 14:49:45 kaleb $ */
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#include "mi.h"
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#include "miline.h"
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/* Draw lineSolid, fillStyle-independent zero width lines.
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*
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* Must keep X and Y coordinates in "ints" at least until after they're
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* translated and clipped to accomodate CoordModePrevious lines with very
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* large coordinates.
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*
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* Draws the same pixels regardless of sign(dx) or sign(dy).
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*
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* Ken Whaley
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*
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*/
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/* largest positive value that can fit into a component of a point.
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* Assumes that the point structure is {type x, y;} where type is
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* a signed type.
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*/
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#define MAX_COORDINATE ((1 << (((sizeof(GdkPoint) >> 1) << 3) - 1)) - 1)
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#define MI_OUTPUT_POINT(xx, yy)\
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{\
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if ( !new_span && yy == current_y)\
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{\
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if (xx < spans->x)\
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spans->x = xx;\
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spans->width++; \
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}\
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else\
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{\
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++Nspans;\
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++spans;\
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spans->x = xx;\
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spans->y = yy;\
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spans->width = 1; \
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spans->height = 1; \
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current_y = yy;\
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new_span = FALSE;\
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}\
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}
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void
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miZeroLine(pDraw, pGC, mode, npt, pptInit)
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GdkDrawable* pDraw;
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GdkGC* pGC;
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int mode; /* Origin or Previous */
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int npt; /* number of points */
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GdkPoint* pptInit;
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{
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int Nspans, current_y;
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GdkPoint* ppt;
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GdkRectangle* pspanInit, *spans;
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int list_len;
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int xleft, ytop, xright, ybottom;
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int new_x1, new_y1, new_x2, new_y2;
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int x, y, x1, y1, x2, y2, xstart, ystart;
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int oc1, oc2;
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int result;
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int pt1_clipped, pt2_clipped = 0;
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gboolean new_span;
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int signdx, signdy;
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int clipdx, clipdy;
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int width, height;
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int adx, ady;
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int octant;
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unsigned int bias = miGetZeroLineBias();
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int e, e1, e2, e3; /* Bresenham error terms */
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int length; /* length of lines == # of pixels on major axis */
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xleft = 0;
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ytop = 0;
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xright = GDK_DRAWABLE_P(pDraw)->width - 1;
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ybottom = GDK_DRAWABLE_P(pDraw)->height - 1;
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/* it doesn't matter whether we're in drawable or screen coordinates,
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* FillSpans simply cannot take starting coordinates outside of the
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* range of a GdkPoint component.
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*/
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/* since we're clipping to the drawable's boundaries & coordinate
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* space boundaries, we're guaranteed that the larger of width/height
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* is the longest span we'll need to output
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*/
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width = xright - xleft + 1;
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height = ybottom - ytop + 1;
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list_len = (height >= width) ? height : width;
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pspanInit = (GdkRectangle*)ALLOCATE_LOCAL(list_len * sizeof(GdkRectangle));
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if (!pspanInit)
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return;
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Nspans = 0;
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new_span = TRUE;
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spans = pspanInit - 1;
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ppt = pptInit;
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xstart = ppt->x;
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ystart = ppt->y;
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/* x2, y2, oc2 copied to x1, y1, oc1 at top of loop to simplify
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* iteration logic
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*/
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x2 = xstart;
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y2 = ystart;
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oc2 = 0;
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MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom);
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while (--npt > 0)
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{
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if (Nspans > 0)
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gdk_fb_fill_spans(pDraw, pGC, pspanInit, Nspans);
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Nspans = 0;
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new_span = TRUE;
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spans = pspanInit - 1;
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x1 = x2;
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y1 = y2;
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oc1 = oc2;
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++ppt;
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x2 = ppt->x;
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y2 = ppt->y;
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oc2 = 0;
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MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom);
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CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant);
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if (adx > ady)
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{
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e1 = ady << 1;
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e2 = e1 - (adx << 1);
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e = e1 - adx;
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length = adx; /* don't draw endpoint in main loop */
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FIXUP_ERROR(e, octant, bias);
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new_x1 = x1;
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new_y1 = y1;
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new_x2 = x2;
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new_y2 = y2;
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pt1_clipped = 0;
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pt2_clipped = 0;
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if ((oc1 | oc2) != 0)
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{
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result = miZeroClipLine(xleft, ytop, xright, ybottom,
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&new_x1, &new_y1, &new_x2, &new_y2,
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adx, ady,
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&pt1_clipped, &pt2_clipped,
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octant, bias, oc1, oc2);
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if (result == -1)
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continue;
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length = abs(new_x2 - new_x1);
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/* if we've clipped the endpoint, always draw the full length
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* of the segment, because then the capstyle doesn't matter
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*/
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if (pt2_clipped)
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length++;
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if (pt1_clipped)
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{
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/* must calculate new error terms */
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clipdx = abs(new_x1 - x1);
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clipdy = abs(new_y1 - y1);
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e += (clipdy * e2) + ((clipdx - clipdy) * e1);
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}
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}
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/* draw the segment */
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x = new_x1;
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y = new_y1;
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e3 = e2 - e1;
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e = e - e1;
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while (length--)
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{
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MI_OUTPUT_POINT(x, y);
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e += e1;
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if (e >= 0)
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{
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y += signdy;
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e += e3;
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}
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x += signdx;
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}
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}
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else /* Y major line */
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{
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e1 = adx << 1;
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e2 = e1 - (ady << 1);
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e = e1 - ady;
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length = ady; /* don't draw endpoint in main loop */
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SetYMajorOctant(octant);
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FIXUP_ERROR(e, octant, bias);
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new_x1 = x1;
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new_y1 = y1;
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new_x2 = x2;
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new_y2 = y2;
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pt1_clipped = 0;
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pt2_clipped = 0;
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if ((oc1 | oc2) != 0)
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{
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result = miZeroClipLine(xleft, ytop, xright, ybottom,
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&new_x1, &new_y1, &new_x2, &new_y2,
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adx, ady,
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&pt1_clipped, &pt2_clipped,
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octant, bias, oc1, oc2);
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if (result == -1)
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continue;
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length = abs(new_y2 - new_y1);
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/* if we've clipped the endpoint, always draw the full length
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* of the segment, because then the capstyle doesn't matter
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*/
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if (pt2_clipped)
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length++;
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if (pt1_clipped)
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{
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/* must calculate new error terms */
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clipdx = abs(new_x1 - x1);
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clipdy = abs(new_y1 - y1);
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e += (clipdx * e2) + ((clipdy - clipdx) * e1);
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}
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}
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/* draw the segment */
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x = new_x1;
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y = new_y1;
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e3 = e2 - e1;
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e = e - e1;
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while (length--)
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{
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MI_OUTPUT_POINT(x, y);
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e += e1;
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if (e >= 0)
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{
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x += signdx;
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e += e3;
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}
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y += signdy;
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}
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}
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}
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/* only do the capnotlast check on the last segment
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* and only if the endpoint wasn't clipped. And then, if the last
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* point is the same as the first point, do not draw it, unless the
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* line is degenerate
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*/
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if ( (! pt2_clipped) && (GDK_GC_FBDATA(pGC)->values.cap_style != GDK_CAP_NOT_LAST) &&
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(((xstart != x2) || (ystart != y2)) || (ppt == pptInit + 1)))
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{
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MI_OUTPUT_POINT(x, y);
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}
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if (Nspans > 0)
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gdk_fb_fill_spans(pDraw, pGC, pspanInit, Nspans);
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DEALLOCATE_LOCAL(pspanInit);
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}
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void
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miZeroDashLine(dst, pgc, mode, nptInit, pptInit)
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GdkDrawable* dst;
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GdkGC* pgc;
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int mode;
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int nptInit; /* number of points in polyline */
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GdkPoint *pptInit; /* points in the polyline */
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{
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/* XXX kludge until real zero-width dash code is written */
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GDK_GC_FBDATA(pgc)->values.line_width = 1;
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miWideDash (dst, pgc, mode, nptInit, pptInit);
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GDK_GC_FBDATA(pgc)->values.line_width = 0;
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}
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