1982 lines
56 KiB
C
1982 lines
56 KiB
C
/*
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Copyright 1988, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/* Author: Keith Packard, MIT X Consortium */
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/*
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* Mostly integer wideline code. Uses a technique similar to
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* bresenham zero-width lines, except walks an X edge
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <stdio.h>
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#ifdef _XOPEN_SOURCE
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#include <math.h>
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#else
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#define _XOPEN_SOURCE /* to get prototype for hypot on some systems */
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#include <math.h>
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#undef _XOPEN_SOURCE
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#endif
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#include <X11/X.h>
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#include "windowstr.h"
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#include "gcstruct.h"
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#include "regionstr.h"
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#include "miwideline.h"
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#include "mi.h"
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static Bool
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InitSpans(Spans * spans, size_t nspans)
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{
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spans->points = malloc(nspans * sizeof(*spans->points));
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if (!spans->points)
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return FALSE;
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spans->widths = malloc(nspans * sizeof(*spans->widths));
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if (!spans->widths) {
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free(spans->points);
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return FALSE;
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}
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return TRUE;
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}
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/*
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* interface data to span-merging polygon filler
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*/
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typedef struct _SpanData {
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SpanGroup fgGroup, bgGroup;
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} SpanDataRec, *SpanDataPtr;
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static void
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AppendSpanGroup(GCPtr pGC, unsigned long pixel, Spans * spanPtr,
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SpanDataPtr spanData)
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{
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SpanGroup *group, *othergroup = NULL;
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if (pixel == pGC->fgPixel) {
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group = &spanData->fgGroup;
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if (pGC->lineStyle == LineDoubleDash)
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othergroup = &spanData->bgGroup;
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}
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else {
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group = &spanData->bgGroup;
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othergroup = &spanData->fgGroup;
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}
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miAppendSpans(group, othergroup, spanPtr);
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}
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static void miLineArc(DrawablePtr pDraw, GCPtr pGC,
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unsigned long pixel, SpanDataPtr spanData,
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LineFacePtr leftFace,
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LineFacePtr rightFace,
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double xorg, double yorg, Bool isInt);
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/*
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* spans-based polygon filler
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*/
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static void
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fillSpans(DrawablePtr pDrawable, GCPtr pGC, unsigned long pixel, Spans * spans,
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SpanDataPtr spanData)
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{
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if (!spanData) {
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ChangeGCVal oldPixel, tmpPixel;
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oldPixel.val = pGC->fgPixel;
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if (pixel != oldPixel.val) {
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tmpPixel.val = (XID) pixel;
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ChangeGC(NullClient, pGC, GCForeground, &tmpPixel);
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ValidateGC(pDrawable, pGC);
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}
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(*pGC->ops->FillSpans) (pDrawable, pGC, spans->count, spans->points,
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spans->widths, TRUE);
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free(spans->widths);
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free(spans->points);
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if (pixel != oldPixel.val) {
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ChangeGC(NullClient, pGC, GCForeground, &oldPixel);
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ValidateGC(pDrawable, pGC);
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}
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}
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else
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AppendSpanGroup(pGC, pixel, spans, spanData);
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}
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static void
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miFillPolyHelper(DrawablePtr pDrawable, GCPtr pGC, unsigned long pixel,
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SpanDataPtr spanData, int y, int overall_height,
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PolyEdgePtr left, PolyEdgePtr right,
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int left_count, int right_count)
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{
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int left_x = 0, left_e = 0;
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int left_stepx = 0;
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int left_signdx = 0;
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int left_dy = 0, left_dx = 0;
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int right_x = 0, right_e = 0;
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int right_stepx = 0;
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int right_signdx = 0;
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int right_dy = 0, right_dx = 0;
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int height = 0;
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int left_height = 0, right_height = 0;
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DDXPointPtr ppt;
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int *pwidth;
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int xorg;
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Spans spanRec;
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if (!InitSpans(&spanRec, overall_height))
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return;
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ppt = spanRec.points;
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pwidth = spanRec.widths;
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xorg = 0;
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if (pGC->miTranslate) {
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y += pDrawable->y;
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xorg = pDrawable->x;
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}
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while ((left_count || left_height) && (right_count || right_height)) {
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if (!left_height && left_count) {
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left_height = left->height;
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left_x = left->x;
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left_stepx = left->stepx;
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left_signdx = left->signdx;
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left_e = left->e;
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left_dy = left->dy;
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left_dx = left->dx;
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--left_count;
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++left;
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}
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if (!right_height && right_count) {
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right_height = right->height;
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right_x = right->x;
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right_stepx = right->stepx;
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right_signdx = right->signdx;
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right_e = right->e;
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right_dy = right->dy;
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right_dx = right->dx;
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--right_count;
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++right;
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}
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height = left_height;
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if (height > right_height)
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height = right_height;
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left_height -= height;
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right_height -= height;
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while (--height >= 0) {
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if (right_x >= left_x) {
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ppt->y = y;
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ppt->x = left_x + xorg;
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ppt++;
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*pwidth++ = right_x - left_x + 1;
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}
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y++;
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left_x += left_stepx;
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left_e += left_dx;
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if (left_e > 0) {
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left_x += left_signdx;
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left_e -= left_dy;
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}
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right_x += right_stepx;
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right_e += right_dx;
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if (right_e > 0) {
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right_x += right_signdx;
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right_e -= right_dy;
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}
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}
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}
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spanRec.count = ppt - spanRec.points;
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fillSpans(pDrawable, pGC, pixel, &spanRec, spanData);
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}
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static void
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miFillRectPolyHelper(DrawablePtr pDrawable,
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GCPtr pGC,
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unsigned long pixel,
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SpanDataPtr spanData, int x, int y, int w, int h)
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{
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DDXPointPtr ppt;
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int *pwidth;
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ChangeGCVal oldPixel, tmpPixel;
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Spans spanRec;
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xRectangle rect;
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if (!spanData) {
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rect.x = x;
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rect.y = y;
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rect.width = w;
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rect.height = h;
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oldPixel.val = pGC->fgPixel;
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if (pixel != oldPixel.val) {
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tmpPixel.val = (XID) pixel;
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ChangeGC(NullClient, pGC, GCForeground, &tmpPixel);
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ValidateGC(pDrawable, pGC);
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}
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(*pGC->ops->PolyFillRect) (pDrawable, pGC, 1, &rect);
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if (pixel != oldPixel.val) {
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ChangeGC(NullClient, pGC, GCForeground, &oldPixel);
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ValidateGC(pDrawable, pGC);
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}
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}
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else {
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if (!InitSpans(&spanRec, h))
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return;
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ppt = spanRec.points;
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pwidth = spanRec.widths;
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if (pGC->miTranslate) {
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y += pDrawable->y;
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x += pDrawable->x;
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}
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while (h--) {
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ppt->x = x;
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ppt->y = y;
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ppt++;
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*pwidth++ = w;
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y++;
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}
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spanRec.count = ppt - spanRec.points;
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AppendSpanGroup(pGC, pixel, &spanRec, spanData);
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}
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}
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/* static */ int
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miPolyBuildEdge(double x0, double y0, double k, /* x0 * dy - y0 * dx */
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int dx, int dy, int xi, int yi, int left, PolyEdgePtr edge)
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{
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int x, y, e;
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int xady;
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if (dy < 0) {
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dy = -dy;
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dx = -dx;
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k = -k;
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}
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#ifdef NOTDEF
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{
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double realk, kerror;
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realk = x0 * dy - y0 * dx;
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kerror = fabs(realk - k);
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if (kerror > .1)
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printf("realk: %g k: %g\n", realk, k);
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}
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#endif
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y = ICEIL(y0);
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xady = ICEIL(k) + y * dx;
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if (xady <= 0)
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x = -(-xady / dy) - 1;
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else
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x = (xady - 1) / dy;
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e = xady - x * dy;
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if (dx >= 0) {
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edge->signdx = 1;
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edge->stepx = dx / dy;
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edge->dx = dx % dy;
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}
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else {
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edge->signdx = -1;
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edge->stepx = -(-dx / dy);
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edge->dx = -dx % dy;
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e = dy - e + 1;
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}
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edge->dy = dy;
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edge->x = x + left + xi;
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edge->e = e - dy; /* bias to compare against 0 instead of dy */
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return y + yi;
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}
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#define StepAround(v, incr, max) (((v) + (incr) < 0) ? (max - 1) : ((v) + (incr) == max) ? 0 : ((v) + (incr)))
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/* static */ int
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miPolyBuildPoly(PolyVertexPtr vertices,
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PolySlopePtr slopes,
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int count,
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int xi,
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int yi,
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PolyEdgePtr left,
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PolyEdgePtr right, int *pnleft, int *pnright, int *h)
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{
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int top, bottom;
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double miny, maxy;
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int i;
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int j;
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int clockwise;
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int slopeoff;
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int s;
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int nright, nleft;
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int y, lasty = 0, bottomy, topy = 0;
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/* find the top of the polygon */
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maxy = miny = vertices[0].y;
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bottom = top = 0;
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for (i = 1; i < count; i++) {
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if (vertices[i].y < miny) {
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top = i;
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miny = vertices[i].y;
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}
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if (vertices[i].y >= maxy) {
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bottom = i;
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maxy = vertices[i].y;
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}
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}
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clockwise = 1;
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slopeoff = 0;
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i = top;
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j = StepAround(top, -1, count);
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if ((int64_t) slopes[j].dy * slopes[i].dx >
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(int64_t) slopes[i].dy * slopes[j].dx) {
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clockwise = -1;
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slopeoff = -1;
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}
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bottomy = ICEIL(maxy) + yi;
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nright = 0;
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s = StepAround(top, slopeoff, count);
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i = top;
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while (i != bottom) {
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if (slopes[s].dy != 0) {
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y = miPolyBuildEdge(vertices[i].x, vertices[i].y,
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slopes[s].k,
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slopes[s].dx, slopes[s].dy,
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xi, yi, 0, &right[nright]);
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if (nright != 0)
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right[nright - 1].height = y - lasty;
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else
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topy = y;
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nright++;
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lasty = y;
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}
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i = StepAround(i, clockwise, count);
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s = StepAround(s, clockwise, count);
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}
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if (nright != 0)
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right[nright - 1].height = bottomy - lasty;
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if (slopeoff == 0)
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slopeoff = -1;
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else
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slopeoff = 0;
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nleft = 0;
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s = StepAround(top, slopeoff, count);
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i = top;
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while (i != bottom) {
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if (slopes[s].dy != 0) {
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y = miPolyBuildEdge(vertices[i].x, vertices[i].y,
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slopes[s].k,
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slopes[s].dx, slopes[s].dy, xi, yi, 1,
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&left[nleft]);
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if (nleft != 0)
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left[nleft - 1].height = y - lasty;
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nleft++;
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lasty = y;
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}
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i = StepAround(i, -clockwise, count);
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s = StepAround(s, -clockwise, count);
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}
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if (nleft != 0)
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left[nleft - 1].height = bottomy - lasty;
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*pnleft = nleft;
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*pnright = nright;
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*h = bottomy - topy;
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return topy;
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}
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static void
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miLineOnePoint(DrawablePtr pDrawable,
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GCPtr pGC,
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unsigned long pixel, SpanDataPtr spanData, int x, int y)
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{
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DDXPointRec pt;
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int wid;
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unsigned long oldPixel;
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MILINESETPIXEL(pDrawable, pGC, pixel, oldPixel);
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if (pGC->fillStyle == FillSolid) {
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pt.x = x;
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pt.y = y;
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(*pGC->ops->PolyPoint) (pDrawable, pGC, CoordModeOrigin, 1, &pt);
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}
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else {
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wid = 1;
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if (pGC->miTranslate) {
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x += pDrawable->x;
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y += pDrawable->y;
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}
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pt.x = x;
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pt.y = y;
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(*pGC->ops->FillSpans) (pDrawable, pGC, 1, &pt, &wid, TRUE);
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}
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MILINERESETPIXEL(pDrawable, pGC, pixel, oldPixel);
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}
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static void
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miLineJoin(DrawablePtr pDrawable,
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GCPtr pGC,
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unsigned long pixel,
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SpanDataPtr spanData, LineFacePtr pLeft, LineFacePtr pRight)
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{
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double mx = 0, my = 0;
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double denom = 0.0;
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PolyVertexRec vertices[4];
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PolySlopeRec slopes[4];
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int edgecount;
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PolyEdgeRec left[4], right[4];
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int nleft, nright;
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int y, height;
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int swapslopes;
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int joinStyle = pGC->joinStyle;
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int lw = pGC->lineWidth;
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if (lw == 1 && !spanData) {
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/* See if one of the lines will draw the joining pixel */
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if (pLeft->dx > 0 || (pLeft->dx == 0 && pLeft->dy > 0))
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return;
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if (pRight->dx > 0 || (pRight->dx == 0 && pRight->dy > 0))
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return;
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if (joinStyle != JoinRound) {
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denom =
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-pLeft->dx * (double) pRight->dy +
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pRight->dx * (double) pLeft->dy;
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if (denom == 0)
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return; /* no join to draw */
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}
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if (joinStyle != JoinMiter) {
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miLineOnePoint(pDrawable, pGC, pixel, spanData, pLeft->x, pLeft->y);
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return;
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}
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}
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else {
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if (joinStyle == JoinRound) {
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miLineArc(pDrawable, pGC, pixel, spanData,
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pLeft, pRight, (double) 0.0, (double) 0.0, TRUE);
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return;
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}
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denom =
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-pLeft->dx * (double) pRight->dy + pRight->dx * (double) pLeft->dy;
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if (denom == 0.0)
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return; /* no join to draw */
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}
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swapslopes = 0;
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if (denom > 0) {
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pLeft->xa = -pLeft->xa;
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pLeft->ya = -pLeft->ya;
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pLeft->dx = -pLeft->dx;
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pLeft->dy = -pLeft->dy;
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}
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else {
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swapslopes = 1;
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pRight->xa = -pRight->xa;
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pRight->ya = -pRight->ya;
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pRight->dx = -pRight->dx;
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pRight->dy = -pRight->dy;
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}
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vertices[0].x = pRight->xa;
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vertices[0].y = pRight->ya;
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slopes[0].dx = -pRight->dy;
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slopes[0].dy = pRight->dx;
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slopes[0].k = 0;
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vertices[1].x = 0;
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vertices[1].y = 0;
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slopes[1].dx = pLeft->dy;
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slopes[1].dy = -pLeft->dx;
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slopes[1].k = 0;
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vertices[2].x = pLeft->xa;
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vertices[2].y = pLeft->ya;
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if (joinStyle == JoinMiter) {
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my = (pLeft->dy * (pRight->xa * pRight->dy - pRight->ya * pRight->dx) -
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pRight->dy * (pLeft->xa * pLeft->dy - pLeft->ya * pLeft->dx)) /
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denom;
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if (pLeft->dy != 0) {
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mx = pLeft->xa + (my - pLeft->ya) *
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|
(double) pLeft->dx / (double) pLeft->dy;
|
|
}
|
|
else {
|
|
mx = pRight->xa + (my - pRight->ya) *
|
|
(double) pRight->dx / (double) pRight->dy;
|
|
}
|
|
/* check miter limit */
|
|
if ((mx * mx + my * my) * 4 > SQSECANT * lw * lw)
|
|
joinStyle = JoinBevel;
|
|
}
|
|
|
|
if (joinStyle == JoinMiter) {
|
|
slopes[2].dx = pLeft->dx;
|
|
slopes[2].dy = pLeft->dy;
|
|
slopes[2].k = pLeft->k;
|
|
if (swapslopes) {
|
|
slopes[2].dx = -slopes[2].dx;
|
|
slopes[2].dy = -slopes[2].dy;
|
|
slopes[2].k = -slopes[2].k;
|
|
}
|
|
vertices[3].x = mx;
|
|
vertices[3].y = my;
|
|
slopes[3].dx = pRight->dx;
|
|
slopes[3].dy = pRight->dy;
|
|
slopes[3].k = pRight->k;
|
|
if (swapslopes) {
|
|
slopes[3].dx = -slopes[3].dx;
|
|
slopes[3].dy = -slopes[3].dy;
|
|
slopes[3].k = -slopes[3].k;
|
|
}
|
|
edgecount = 4;
|
|
}
|
|
else {
|
|
double scale, dx, dy, adx, ady;
|
|
|
|
adx = dx = pRight->xa - pLeft->xa;
|
|
ady = dy = pRight->ya - pLeft->ya;
|
|
if (adx < 0)
|
|
adx = -adx;
|
|
if (ady < 0)
|
|
ady = -ady;
|
|
scale = ady;
|
|
if (adx > ady)
|
|
scale = adx;
|
|
slopes[2].dx = (dx * 65536) / scale;
|
|
slopes[2].dy = (dy * 65536) / scale;
|
|
slopes[2].k = ((pLeft->xa + pRight->xa) * slopes[2].dy -
|
|
(pLeft->ya + pRight->ya) * slopes[2].dx) / 2.0;
|
|
edgecount = 3;
|
|
}
|
|
|
|
y = miPolyBuildPoly(vertices, slopes, edgecount, pLeft->x, pLeft->y,
|
|
left, right, &nleft, &nright, &height);
|
|
miFillPolyHelper(pDrawable, pGC, pixel, spanData, y, height, left, right,
|
|
nleft, nright);
|
|
}
|
|
|
|
static int
|
|
miLineArcI(DrawablePtr pDraw,
|
|
GCPtr pGC, int xorg, int yorg, DDXPointPtr points, int *widths)
|
|
{
|
|
DDXPointPtr tpts, bpts;
|
|
int *twids, *bwids;
|
|
int x, y, e, ex, slw;
|
|
|
|
tpts = points;
|
|
twids = widths;
|
|
if (pGC->miTranslate) {
|
|
xorg += pDraw->x;
|
|
yorg += pDraw->y;
|
|
}
|
|
slw = pGC->lineWidth;
|
|
if (slw == 1) {
|
|
tpts->x = xorg;
|
|
tpts->y = yorg;
|
|
*twids = 1;
|
|
return 1;
|
|
}
|
|
bpts = tpts + slw;
|
|
bwids = twids + slw;
|
|
y = (slw >> 1) + 1;
|
|
if (slw & 1)
|
|
e = -((y << 2) + 3);
|
|
else
|
|
e = -(y << 3);
|
|
ex = -4;
|
|
x = 0;
|
|
while (y) {
|
|
e += (y << 3) - 4;
|
|
while (e >= 0) {
|
|
x++;
|
|
e += (ex = -((x << 3) + 4));
|
|
}
|
|
y--;
|
|
slw = (x << 1) + 1;
|
|
if ((e == ex) && (slw > 1))
|
|
slw--;
|
|
tpts->x = xorg - x;
|
|
tpts->y = yorg - y;
|
|
tpts++;
|
|
*twids++ = slw;
|
|
if ((y != 0) && ((slw > 1) || (e != ex))) {
|
|
bpts--;
|
|
bpts->x = xorg - x;
|
|
bpts->y = yorg + y;
|
|
*--bwids = slw;
|
|
}
|
|
}
|
|
return pGC->lineWidth;
|
|
}
|
|
|
|
#define CLIPSTEPEDGE(edgey,edge,edgeleft) \
|
|
if (ybase == edgey) \
|
|
{ \
|
|
if (edgeleft) \
|
|
{ \
|
|
if (edge->x > xcl) \
|
|
xcl = edge->x; \
|
|
} \
|
|
else \
|
|
{ \
|
|
if (edge->x < xcr) \
|
|
xcr = edge->x; \
|
|
} \
|
|
edgey++; \
|
|
edge->x += edge->stepx; \
|
|
edge->e += edge->dx; \
|
|
if (edge->e > 0) \
|
|
{ \
|
|
edge->x += edge->signdx; \
|
|
edge->e -= edge->dy; \
|
|
} \
|
|
}
|
|
|
|
static int
|
|
miLineArcD(DrawablePtr pDraw,
|
|
GCPtr pGC,
|
|
double xorg,
|
|
double yorg,
|
|
DDXPointPtr points,
|
|
int *widths,
|
|
PolyEdgePtr edge1,
|
|
int edgey1,
|
|
Bool edgeleft1, PolyEdgePtr edge2, int edgey2, Bool edgeleft2)
|
|
{
|
|
DDXPointPtr pts;
|
|
int *wids;
|
|
double radius, x0, y0, el, er, yk, xlk, xrk, k;
|
|
int xbase, ybase, y, boty, xl, xr, xcl, xcr;
|
|
int ymin, ymax;
|
|
Bool edge1IsMin, edge2IsMin;
|
|
int ymin1, ymin2;
|
|
|
|
pts = points;
|
|
wids = widths;
|
|
xbase = floor(xorg);
|
|
x0 = xorg - xbase;
|
|
ybase = ICEIL(yorg);
|
|
y0 = yorg - ybase;
|
|
if (pGC->miTranslate) {
|
|
xbase += pDraw->x;
|
|
ybase += pDraw->y;
|
|
edge1->x += pDraw->x;
|
|
edge2->x += pDraw->x;
|
|
edgey1 += pDraw->y;
|
|
edgey2 += pDraw->y;
|
|
}
|
|
xlk = x0 + x0 + 1.0;
|
|
xrk = x0 + x0 - 1.0;
|
|
yk = y0 + y0 - 1.0;
|
|
radius = ((double) pGC->lineWidth) / 2.0;
|
|
y = floor(radius - y0 + 1.0);
|
|
ybase -= y;
|
|
ymin = ybase;
|
|
ymax = 65536;
|
|
edge1IsMin = FALSE;
|
|
ymin1 = edgey1;
|
|
if (edge1->dy >= 0) {
|
|
if (!edge1->dy) {
|
|
if (edgeleft1)
|
|
edge1IsMin = TRUE;
|
|
else
|
|
ymax = edgey1;
|
|
edgey1 = 65536;
|
|
}
|
|
else {
|
|
if ((edge1->signdx < 0) == edgeleft1)
|
|
edge1IsMin = TRUE;
|
|
}
|
|
}
|
|
edge2IsMin = FALSE;
|
|
ymin2 = edgey2;
|
|
if (edge2->dy >= 0) {
|
|
if (!edge2->dy) {
|
|
if (edgeleft2)
|
|
edge2IsMin = TRUE;
|
|
else
|
|
ymax = edgey2;
|
|
edgey2 = 65536;
|
|
}
|
|
else {
|
|
if ((edge2->signdx < 0) == edgeleft2)
|
|
edge2IsMin = TRUE;
|
|
}
|
|
}
|
|
if (edge1IsMin) {
|
|
ymin = ymin1;
|
|
if (edge2IsMin && ymin1 > ymin2)
|
|
ymin = ymin2;
|
|
}
|
|
else if (edge2IsMin)
|
|
ymin = ymin2;
|
|
el = radius * radius - ((y + y0) * (y + y0)) - (x0 * x0);
|
|
er = el + xrk;
|
|
xl = 1;
|
|
xr = 0;
|
|
if (x0 < 0.5) {
|
|
xl = 0;
|
|
el -= xlk;
|
|
}
|
|
boty = (y0 < -0.5) ? 1 : 0;
|
|
if (ybase + y - boty > ymax)
|
|
boty = ymax - ybase - y;
|
|
while (y > boty) {
|
|
k = (y << 1) + yk;
|
|
er += k;
|
|
while (er > 0.0) {
|
|
xr++;
|
|
er += xrk - (xr << 1);
|
|
}
|
|
el += k;
|
|
while (el >= 0.0) {
|
|
xl--;
|
|
el += (xl << 1) - xlk;
|
|
}
|
|
y--;
|
|
ybase++;
|
|
if (ybase < ymin)
|
|
continue;
|
|
xcl = xl + xbase;
|
|
xcr = xr + xbase;
|
|
CLIPSTEPEDGE(edgey1, edge1, edgeleft1);
|
|
CLIPSTEPEDGE(edgey2, edge2, edgeleft2);
|
|
if (xcr >= xcl) {
|
|
pts->x = xcl;
|
|
pts->y = ybase;
|
|
pts++;
|
|
*wids++ = xcr - xcl + 1;
|
|
}
|
|
}
|
|
er = xrk - (xr << 1) - er;
|
|
el = (xl << 1) - xlk - el;
|
|
boty = floor(-y0 - radius + 1.0);
|
|
if (ybase + y - boty > ymax)
|
|
boty = ymax - ybase - y;
|
|
while (y > boty) {
|
|
k = (y << 1) + yk;
|
|
er -= k;
|
|
while ((er >= 0.0) && (xr >= 0)) {
|
|
xr--;
|
|
er += xrk - (xr << 1);
|
|
}
|
|
el -= k;
|
|
while ((el > 0.0) && (xl <= 0)) {
|
|
xl++;
|
|
el += (xl << 1) - xlk;
|
|
}
|
|
y--;
|
|
ybase++;
|
|
if (ybase < ymin)
|
|
continue;
|
|
xcl = xl + xbase;
|
|
xcr = xr + xbase;
|
|
CLIPSTEPEDGE(edgey1, edge1, edgeleft1);
|
|
CLIPSTEPEDGE(edgey2, edge2, edgeleft2);
|
|
if (xcr >= xcl) {
|
|
pts->x = xcl;
|
|
pts->y = ybase;
|
|
pts++;
|
|
*wids++ = xcr - xcl + 1;
|
|
}
|
|
}
|
|
return pts - points;
|
|
}
|
|
|
|
static int
|
|
miRoundJoinFace(LineFacePtr face, PolyEdgePtr edge, Bool *leftEdge)
|
|
{
|
|
int y;
|
|
int dx, dy;
|
|
double xa, ya;
|
|
Bool left;
|
|
|
|
dx = -face->dy;
|
|
dy = face->dx;
|
|
xa = face->xa;
|
|
ya = face->ya;
|
|
left = 1;
|
|
if (ya > 0) {
|
|
ya = 0.0;
|
|
xa = 0.0;
|
|
}
|
|
if (dy < 0 || (dy == 0 && dx > 0)) {
|
|
dx = -dx;
|
|
dy = -dy;
|
|
left = !left;
|
|
}
|
|
if (dx == 0 && dy == 0)
|
|
dy = 1;
|
|
if (dy == 0) {
|
|
y = ICEIL(face->ya) + face->y;
|
|
edge->x = -32767;
|
|
edge->stepx = 0;
|
|
edge->signdx = 0;
|
|
edge->e = -1;
|
|
edge->dy = 0;
|
|
edge->dx = 0;
|
|
edge->height = 0;
|
|
}
|
|
else {
|
|
y = miPolyBuildEdge(xa, ya, 0.0, dx, dy, face->x, face->y, !left, edge);
|
|
edge->height = 32767;
|
|
}
|
|
*leftEdge = !left;
|
|
return y;
|
|
}
|
|
|
|
void
|
|
miRoundJoinClip(LineFacePtr pLeft, LineFacePtr pRight,
|
|
PolyEdgePtr edge1, PolyEdgePtr edge2,
|
|
int *y1, int *y2, Bool *left1, Bool *left2)
|
|
{
|
|
double denom;
|
|
|
|
denom = -pLeft->dx * (double) pRight->dy + pRight->dx * (double) pLeft->dy;
|
|
|
|
if (denom >= 0) {
|
|
pLeft->xa = -pLeft->xa;
|
|
pLeft->ya = -pLeft->ya;
|
|
}
|
|
else {
|
|
pRight->xa = -pRight->xa;
|
|
pRight->ya = -pRight->ya;
|
|
}
|
|
*y1 = miRoundJoinFace(pLeft, edge1, left1);
|
|
*y2 = miRoundJoinFace(pRight, edge2, left2);
|
|
}
|
|
|
|
int
|
|
miRoundCapClip(LineFacePtr face, Bool isInt, PolyEdgePtr edge, Bool *leftEdge)
|
|
{
|
|
int y;
|
|
int dx, dy;
|
|
double xa, ya, k;
|
|
Bool left;
|
|
|
|
dx = -face->dy;
|
|
dy = face->dx;
|
|
xa = face->xa;
|
|
ya = face->ya;
|
|
k = 0.0;
|
|
if (!isInt)
|
|
k = face->k;
|
|
left = 1;
|
|
if (dy < 0 || (dy == 0 && dx > 0)) {
|
|
dx = -dx;
|
|
dy = -dy;
|
|
xa = -xa;
|
|
ya = -ya;
|
|
left = !left;
|
|
}
|
|
if (dx == 0 && dy == 0)
|
|
dy = 1;
|
|
if (dy == 0) {
|
|
y = ICEIL(face->ya) + face->y;
|
|
edge->x = -32767;
|
|
edge->stepx = 0;
|
|
edge->signdx = 0;
|
|
edge->e = -1;
|
|
edge->dy = 0;
|
|
edge->dx = 0;
|
|
edge->height = 0;
|
|
}
|
|
else {
|
|
y = miPolyBuildEdge(xa, ya, k, dx, dy, face->x, face->y, !left, edge);
|
|
edge->height = 32767;
|
|
}
|
|
*leftEdge = !left;
|
|
return y;
|
|
}
|
|
|
|
static void
|
|
miLineArc(DrawablePtr pDraw,
|
|
GCPtr pGC,
|
|
unsigned long pixel,
|
|
SpanDataPtr spanData,
|
|
LineFacePtr leftFace,
|
|
LineFacePtr rightFace, double xorg, double yorg, Bool isInt)
|
|
{
|
|
int xorgi = 0, yorgi = 0;
|
|
Spans spanRec;
|
|
int n;
|
|
PolyEdgeRec edge1, edge2;
|
|
int edgey1, edgey2;
|
|
Bool edgeleft1, edgeleft2;
|
|
|
|
if (isInt) {
|
|
xorgi = leftFace ? leftFace->x : rightFace->x;
|
|
yorgi = leftFace ? leftFace->y : rightFace->y;
|
|
}
|
|
edgey1 = 65536;
|
|
edgey2 = 65536;
|
|
edge1.x = 0; /* not used, keep memory checkers happy */
|
|
edge1.dy = -1;
|
|
edge2.x = 0; /* not used, keep memory checkers happy */
|
|
edge2.dy = -1;
|
|
edgeleft1 = FALSE;
|
|
edgeleft2 = FALSE;
|
|
if ((pGC->lineStyle != LineSolid || pGC->lineWidth > 2) &&
|
|
((pGC->capStyle == CapRound && pGC->joinStyle != JoinRound) ||
|
|
(pGC->joinStyle == JoinRound && pGC->capStyle == CapButt))) {
|
|
if (isInt) {
|
|
xorg = (double) xorgi;
|
|
yorg = (double) yorgi;
|
|
}
|
|
if (leftFace && rightFace) {
|
|
miRoundJoinClip(leftFace, rightFace, &edge1, &edge2,
|
|
&edgey1, &edgey2, &edgeleft1, &edgeleft2);
|
|
}
|
|
else if (leftFace) {
|
|
edgey1 = miRoundCapClip(leftFace, isInt, &edge1, &edgeleft1);
|
|
}
|
|
else if (rightFace) {
|
|
edgey2 = miRoundCapClip(rightFace, isInt, &edge2, &edgeleft2);
|
|
}
|
|
isInt = FALSE;
|
|
}
|
|
if (!InitSpans(&spanRec, pGC->lineWidth))
|
|
return;
|
|
if (isInt)
|
|
n = miLineArcI(pDraw, pGC, xorgi, yorgi, spanRec.points,
|
|
spanRec.widths);
|
|
else
|
|
n = miLineArcD(pDraw, pGC, xorg, yorg, spanRec.points, spanRec.widths,
|
|
&edge1, edgey1, edgeleft1, &edge2, edgey2, edgeleft2);
|
|
spanRec.count = n;
|
|
fillSpans(pDraw, pGC, pixel, &spanRec, spanData);
|
|
}
|
|
|
|
static void
|
|
miLineProjectingCap(DrawablePtr pDrawable, GCPtr pGC, unsigned long pixel,
|
|
SpanDataPtr spanData, LineFacePtr face, Bool isLeft,
|
|
double xorg, double yorg, Bool isInt)
|
|
{
|
|
int xorgi = 0, yorgi = 0;
|
|
int lw;
|
|
PolyEdgeRec lefts[4], rights[4];
|
|
int lefty, righty, topy, bottomy;
|
|
PolyEdgePtr left, right;
|
|
PolyEdgePtr top, bottom;
|
|
double xa, ya;
|
|
double k;
|
|
double xap, yap;
|
|
int dx, dy;
|
|
double projectXoff, projectYoff;
|
|
double maxy;
|
|
int finaly;
|
|
|
|
if (isInt) {
|
|
xorgi = face->x;
|
|
yorgi = face->y;
|
|
}
|
|
lw = pGC->lineWidth;
|
|
dx = face->dx;
|
|
dy = face->dy;
|
|
k = face->k;
|
|
if (dy == 0) {
|
|
lefts[0].height = lw;
|
|
lefts[0].x = xorgi;
|
|
if (isLeft)
|
|
lefts[0].x -= (lw >> 1);
|
|
lefts[0].stepx = 0;
|
|
lefts[0].signdx = 1;
|
|
lefts[0].e = -lw;
|
|
lefts[0].dx = 0;
|
|
lefts[0].dy = lw;
|
|
rights[0].height = lw;
|
|
rights[0].x = xorgi;
|
|
if (!isLeft)
|
|
rights[0].x += ((lw + 1) >> 1);
|
|
rights[0].stepx = 0;
|
|
rights[0].signdx = 1;
|
|
rights[0].e = -lw;
|
|
rights[0].dx = 0;
|
|
rights[0].dy = lw;
|
|
miFillPolyHelper(pDrawable, pGC, pixel, spanData, yorgi - (lw >> 1), lw,
|
|
lefts, rights, 1, 1);
|
|
}
|
|
else if (dx == 0) {
|
|
if (dy < 0) {
|
|
dy = -dy;
|
|
isLeft = !isLeft;
|
|
}
|
|
topy = yorgi;
|
|
bottomy = yorgi + dy;
|
|
if (isLeft)
|
|
topy -= (lw >> 1);
|
|
else
|
|
bottomy += (lw >> 1);
|
|
lefts[0].height = bottomy - topy;
|
|
lefts[0].x = xorgi - (lw >> 1);
|
|
lefts[0].stepx = 0;
|
|
lefts[0].signdx = 1;
|
|
lefts[0].e = -dy;
|
|
lefts[0].dx = dx;
|
|
lefts[0].dy = dy;
|
|
|
|
rights[0].height = bottomy - topy;
|
|
rights[0].x = lefts[0].x + (lw - 1);
|
|
rights[0].stepx = 0;
|
|
rights[0].signdx = 1;
|
|
rights[0].e = -dy;
|
|
rights[0].dx = dx;
|
|
rights[0].dy = dy;
|
|
miFillPolyHelper(pDrawable, pGC, pixel, spanData, topy, bottomy - topy,
|
|
lefts, rights, 1, 1);
|
|
}
|
|
else {
|
|
xa = face->xa;
|
|
ya = face->ya;
|
|
projectXoff = -ya;
|
|
projectYoff = xa;
|
|
if (dx < 0) {
|
|
right = &rights[1];
|
|
left = &lefts[0];
|
|
top = &rights[0];
|
|
bottom = &lefts[1];
|
|
}
|
|
else {
|
|
right = &rights[0];
|
|
left = &lefts[1];
|
|
top = &lefts[0];
|
|
bottom = &rights[1];
|
|
}
|
|
if (isLeft) {
|
|
righty = miPolyBuildEdge(xa, ya, k, dx, dy, xorgi, yorgi, 0, right);
|
|
|
|
xa = -xa;
|
|
ya = -ya;
|
|
k = -k;
|
|
lefty = miPolyBuildEdge(xa - projectXoff, ya - projectYoff,
|
|
k, dx, dy, xorgi, yorgi, 1, left);
|
|
if (dx > 0) {
|
|
ya = -ya;
|
|
xa = -xa;
|
|
}
|
|
xap = xa - projectXoff;
|
|
yap = ya - projectYoff;
|
|
topy = miPolyBuildEdge(xap, yap, xap * dx + yap * dy,
|
|
-dy, dx, xorgi, yorgi, dx > 0, top);
|
|
bottomy = miPolyBuildEdge(xa, ya,
|
|
0.0, -dy, dx, xorgi, yorgi, dx < 0,
|
|
bottom);
|
|
maxy = -ya;
|
|
}
|
|
else {
|
|
righty = miPolyBuildEdge(xa - projectXoff, ya - projectYoff,
|
|
k, dx, dy, xorgi, yorgi, 0, right);
|
|
|
|
xa = -xa;
|
|
ya = -ya;
|
|
k = -k;
|
|
lefty = miPolyBuildEdge(xa, ya, k, dx, dy, xorgi, yorgi, 1, left);
|
|
if (dx > 0) {
|
|
ya = -ya;
|
|
xa = -xa;
|
|
}
|
|
xap = xa - projectXoff;
|
|
yap = ya - projectYoff;
|
|
topy =
|
|
miPolyBuildEdge(xa, ya, 0.0, -dy, dx, xorgi, xorgi, dx > 0,
|
|
top);
|
|
bottomy =
|
|
miPolyBuildEdge(xap, yap, xap * dx + yap * dy, -dy, dx, xorgi,
|
|
xorgi, dx < 0, bottom);
|
|
maxy = -ya + projectYoff;
|
|
}
|
|
finaly = ICEIL(maxy) + yorgi;
|
|
if (dx < 0) {
|
|
left->height = bottomy - lefty;
|
|
right->height = finaly - righty;
|
|
top->height = righty - topy;
|
|
}
|
|
else {
|
|
right->height = bottomy - righty;
|
|
left->height = finaly - lefty;
|
|
top->height = lefty - topy;
|
|
}
|
|
bottom->height = finaly - bottomy;
|
|
miFillPolyHelper(pDrawable, pGC, pixel, spanData, topy,
|
|
bottom->height + bottomy - topy, lefts, rights, 2, 2);
|
|
}
|
|
}
|
|
|
|
static void
|
|
miWideSegment(DrawablePtr pDrawable,
|
|
GCPtr pGC,
|
|
unsigned long pixel,
|
|
SpanDataPtr spanData,
|
|
int x1,
|
|
int y1,
|
|
int x2,
|
|
int y2,
|
|
Bool projectLeft,
|
|
Bool projectRight, LineFacePtr leftFace, LineFacePtr rightFace)
|
|
{
|
|
double l, L, r;
|
|
double xa, ya;
|
|
double projectXoff = 0.0, projectYoff = 0.0;
|
|
double k;
|
|
double maxy;
|
|
int x, y;
|
|
int dx, dy;
|
|
int finaly;
|
|
PolyEdgePtr left, right;
|
|
PolyEdgePtr top, bottom;
|
|
int lefty, righty, topy, bottomy;
|
|
int signdx;
|
|
PolyEdgeRec lefts[4], rights[4];
|
|
LineFacePtr tface;
|
|
int lw = pGC->lineWidth;
|
|
|
|
/* draw top-to-bottom always */
|
|
if (y2 < y1 || (y2 == y1 && x2 < x1)) {
|
|
x = x1;
|
|
x1 = x2;
|
|
x2 = x;
|
|
|
|
y = y1;
|
|
y1 = y2;
|
|
y2 = y;
|
|
|
|
x = projectLeft;
|
|
projectLeft = projectRight;
|
|
projectRight = x;
|
|
|
|
tface = leftFace;
|
|
leftFace = rightFace;
|
|
rightFace = tface;
|
|
}
|
|
|
|
dy = y2 - y1;
|
|
signdx = 1;
|
|
dx = x2 - x1;
|
|
if (dx < 0)
|
|
signdx = -1;
|
|
|
|
leftFace->x = x1;
|
|
leftFace->y = y1;
|
|
leftFace->dx = dx;
|
|
leftFace->dy = dy;
|
|
|
|
rightFace->x = x2;
|
|
rightFace->y = y2;
|
|
rightFace->dx = -dx;
|
|
rightFace->dy = -dy;
|
|
|
|
if (dy == 0) {
|
|
rightFace->xa = 0;
|
|
rightFace->ya = (double) lw / 2.0;
|
|
rightFace->k = -(double) (lw * dx) / 2.0;
|
|
leftFace->xa = 0;
|
|
leftFace->ya = -rightFace->ya;
|
|
leftFace->k = rightFace->k;
|
|
x = x1;
|
|
if (projectLeft)
|
|
x -= (lw >> 1);
|
|
y = y1 - (lw >> 1);
|
|
dx = x2 - x;
|
|
if (projectRight)
|
|
dx += ((lw + 1) >> 1);
|
|
dy = lw;
|
|
miFillRectPolyHelper(pDrawable, pGC, pixel, spanData, x, y, dx, dy);
|
|
}
|
|
else if (dx == 0) {
|
|
leftFace->xa = (double) lw / 2.0;
|
|
leftFace->ya = 0;
|
|
leftFace->k = (double) (lw * dy) / 2.0;
|
|
rightFace->xa = -leftFace->xa;
|
|
rightFace->ya = 0;
|
|
rightFace->k = leftFace->k;
|
|
y = y1;
|
|
if (projectLeft)
|
|
y -= lw >> 1;
|
|
x = x1 - (lw >> 1);
|
|
dy = y2 - y;
|
|
if (projectRight)
|
|
dy += ((lw + 1) >> 1);
|
|
dx = lw;
|
|
miFillRectPolyHelper(pDrawable, pGC, pixel, spanData, x, y, dx, dy);
|
|
}
|
|
else {
|
|
l = ((double) lw) / 2.0;
|
|
L = hypot((double) dx, (double) dy);
|
|
|
|
if (dx < 0) {
|
|
right = &rights[1];
|
|
left = &lefts[0];
|
|
top = &rights[0];
|
|
bottom = &lefts[1];
|
|
}
|
|
else {
|
|
right = &rights[0];
|
|
left = &lefts[1];
|
|
top = &lefts[0];
|
|
bottom = &rights[1];
|
|
}
|
|
r = l / L;
|
|
|
|
/* coord of upper bound at integral y */
|
|
ya = -r * dx;
|
|
xa = r * dy;
|
|
|
|
if (projectLeft | projectRight) {
|
|
projectXoff = -ya;
|
|
projectYoff = xa;
|
|
}
|
|
|
|
/* xa * dy - ya * dx */
|
|
k = l * L;
|
|
|
|
leftFace->xa = xa;
|
|
leftFace->ya = ya;
|
|
leftFace->k = k;
|
|
rightFace->xa = -xa;
|
|
rightFace->ya = -ya;
|
|
rightFace->k = k;
|
|
|
|
if (projectLeft)
|
|
righty = miPolyBuildEdge(xa - projectXoff, ya - projectYoff,
|
|
k, dx, dy, x1, y1, 0, right);
|
|
else
|
|
righty = miPolyBuildEdge(xa, ya, k, dx, dy, x1, y1, 0, right);
|
|
|
|
/* coord of lower bound at integral y */
|
|
ya = -ya;
|
|
xa = -xa;
|
|
|
|
/* xa * dy - ya * dx */
|
|
k = -k;
|
|
|
|
if (projectLeft)
|
|
lefty = miPolyBuildEdge(xa - projectXoff, ya - projectYoff,
|
|
k, dx, dy, x1, y1, 1, left);
|
|
else
|
|
lefty = miPolyBuildEdge(xa, ya, k, dx, dy, x1, y1, 1, left);
|
|
|
|
/* coord of top face at integral y */
|
|
|
|
if (signdx > 0) {
|
|
ya = -ya;
|
|
xa = -xa;
|
|
}
|
|
|
|
if (projectLeft) {
|
|
double xap = xa - projectXoff;
|
|
double yap = ya - projectYoff;
|
|
|
|
topy = miPolyBuildEdge(xap, yap, xap * dx + yap * dy,
|
|
-dy, dx, x1, y1, dx > 0, top);
|
|
}
|
|
else
|
|
topy = miPolyBuildEdge(xa, ya, 0.0, -dy, dx, x1, y1, dx > 0, top);
|
|
|
|
/* coord of bottom face at integral y */
|
|
|
|
if (projectRight) {
|
|
double xap = xa + projectXoff;
|
|
double yap = ya + projectYoff;
|
|
|
|
bottomy = miPolyBuildEdge(xap, yap, xap * dx + yap * dy,
|
|
-dy, dx, x2, y2, dx < 0, bottom);
|
|
maxy = -ya + projectYoff;
|
|
}
|
|
else {
|
|
bottomy = miPolyBuildEdge(xa, ya,
|
|
0.0, -dy, dx, x2, y2, dx < 0, bottom);
|
|
maxy = -ya;
|
|
}
|
|
|
|
finaly = ICEIL(maxy) + y2;
|
|
|
|
if (dx < 0) {
|
|
left->height = bottomy - lefty;
|
|
right->height = finaly - righty;
|
|
top->height = righty - topy;
|
|
}
|
|
else {
|
|
right->height = bottomy - righty;
|
|
left->height = finaly - lefty;
|
|
top->height = lefty - topy;
|
|
}
|
|
bottom->height = finaly - bottomy;
|
|
miFillPolyHelper(pDrawable, pGC, pixel, spanData, topy,
|
|
bottom->height + bottomy - topy, lefts, rights, 2, 2);
|
|
}
|
|
}
|
|
|
|
static SpanDataPtr
|
|
miSetupSpanData(GCPtr pGC, SpanDataPtr spanData, int npt)
|
|
{
|
|
if ((npt < 3 && pGC->capStyle != CapRound) || miSpansEasyRop(pGC->alu))
|
|
return (SpanDataPtr) NULL;
|
|
if (pGC->lineStyle == LineDoubleDash)
|
|
miInitSpanGroup(&spanData->bgGroup);
|
|
miInitSpanGroup(&spanData->fgGroup);
|
|
return spanData;
|
|
}
|
|
|
|
static void
|
|
miCleanupSpanData(DrawablePtr pDrawable, GCPtr pGC, SpanDataPtr spanData)
|
|
{
|
|
if (pGC->lineStyle == LineDoubleDash) {
|
|
ChangeGCVal oldPixel, pixel;
|
|
|
|
pixel.val = pGC->bgPixel;
|
|
oldPixel.val = pGC->fgPixel;
|
|
if (pixel.val != oldPixel.val) {
|
|
ChangeGC(NullClient, pGC, GCForeground, &pixel);
|
|
ValidateGC(pDrawable, pGC);
|
|
}
|
|
miFillUniqueSpanGroup(pDrawable, pGC, &spanData->bgGroup);
|
|
miFreeSpanGroup(&spanData->bgGroup);
|
|
if (pixel.val != oldPixel.val) {
|
|
ChangeGC(NullClient, pGC, GCForeground, &oldPixel);
|
|
ValidateGC(pDrawable, pGC);
|
|
}
|
|
}
|
|
miFillUniqueSpanGroup(pDrawable, pGC, &spanData->fgGroup);
|
|
miFreeSpanGroup(&spanData->fgGroup);
|
|
}
|
|
|
|
void
|
|
miWideLine(DrawablePtr pDrawable, GCPtr pGC,
|
|
int mode, int npt, DDXPointPtr pPts)
|
|
{
|
|
int x1, y1, x2, y2;
|
|
SpanDataRec spanDataRec;
|
|
SpanDataPtr spanData;
|
|
long pixel;
|
|
Bool projectLeft, projectRight;
|
|
LineFaceRec leftFace, rightFace, prevRightFace;
|
|
LineFaceRec firstFace;
|
|
int first;
|
|
Bool somethingDrawn = FALSE;
|
|
Bool selfJoin;
|
|
|
|
spanData = miSetupSpanData(pGC, &spanDataRec, npt);
|
|
pixel = pGC->fgPixel;
|
|
x2 = pPts->x;
|
|
y2 = pPts->y;
|
|
first = TRUE;
|
|
selfJoin = FALSE;
|
|
if (npt > 1) {
|
|
if (mode == CoordModePrevious) {
|
|
int nptTmp;
|
|
DDXPointPtr pPtsTmp;
|
|
|
|
x1 = x2;
|
|
y1 = y2;
|
|
nptTmp = npt;
|
|
pPtsTmp = pPts + 1;
|
|
while (--nptTmp) {
|
|
x1 += pPtsTmp->x;
|
|
y1 += pPtsTmp->y;
|
|
++pPtsTmp;
|
|
}
|
|
if (x2 == x1 && y2 == y1)
|
|
selfJoin = TRUE;
|
|
}
|
|
else if (x2 == pPts[npt - 1].x && y2 == pPts[npt - 1].y) {
|
|
selfJoin = TRUE;
|
|
}
|
|
}
|
|
projectLeft = pGC->capStyle == CapProjecting && !selfJoin;
|
|
projectRight = FALSE;
|
|
while (--npt) {
|
|
x1 = x2;
|
|
y1 = y2;
|
|
++pPts;
|
|
x2 = pPts->x;
|
|
y2 = pPts->y;
|
|
if (mode == CoordModePrevious) {
|
|
x2 += x1;
|
|
y2 += y1;
|
|
}
|
|
if (x1 != x2 || y1 != y2) {
|
|
somethingDrawn = TRUE;
|
|
if (npt == 1 && pGC->capStyle == CapProjecting && !selfJoin)
|
|
projectRight = TRUE;
|
|
miWideSegment(pDrawable, pGC, pixel, spanData, x1, y1, x2, y2,
|
|
projectLeft, projectRight, &leftFace, &rightFace);
|
|
if (first) {
|
|
if (selfJoin)
|
|
firstFace = leftFace;
|
|
else if (pGC->capStyle == CapRound) {
|
|
if (pGC->lineWidth == 1 && !spanData)
|
|
miLineOnePoint(pDrawable, pGC, pixel, spanData, x1, y1);
|
|
else
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
&leftFace, (LineFacePtr) NULL,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
}
|
|
}
|
|
else {
|
|
miLineJoin(pDrawable, pGC, pixel, spanData, &leftFace,
|
|
&prevRightFace);
|
|
}
|
|
prevRightFace = rightFace;
|
|
first = FALSE;
|
|
projectLeft = FALSE;
|
|
}
|
|
if (npt == 1 && somethingDrawn) {
|
|
if (selfJoin)
|
|
miLineJoin(pDrawable, pGC, pixel, spanData, &firstFace,
|
|
&rightFace);
|
|
else if (pGC->capStyle == CapRound) {
|
|
if (pGC->lineWidth == 1 && !spanData)
|
|
miLineOnePoint(pDrawable, pGC, pixel, spanData, x2, y2);
|
|
else
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
(LineFacePtr) NULL, &rightFace,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
}
|
|
}
|
|
}
|
|
/* handle crock where all points are coincedent */
|
|
if (!somethingDrawn) {
|
|
projectLeft = pGC->capStyle == CapProjecting;
|
|
miWideSegment(pDrawable, pGC, pixel, spanData,
|
|
x2, y2, x2, y2, projectLeft, projectLeft,
|
|
&leftFace, &rightFace);
|
|
if (pGC->capStyle == CapRound) {
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
&leftFace, (LineFacePtr) NULL,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
rightFace.dx = -1; /* sleezy hack to make it work */
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
(LineFacePtr) NULL, &rightFace,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
}
|
|
}
|
|
if (spanData)
|
|
miCleanupSpanData(pDrawable, pGC, spanData);
|
|
}
|
|
|
|
#define V_TOP 0
|
|
#define V_RIGHT 1
|
|
#define V_BOTTOM 2
|
|
#define V_LEFT 3
|
|
|
|
static void
|
|
miWideDashSegment(DrawablePtr pDrawable,
|
|
GCPtr pGC,
|
|
SpanDataPtr spanData,
|
|
int *pDashOffset,
|
|
int *pDashIndex,
|
|
int x1,
|
|
int y1,
|
|
int x2,
|
|
int y2,
|
|
Bool projectLeft,
|
|
Bool projectRight,
|
|
LineFacePtr leftFace, LineFacePtr rightFace)
|
|
{
|
|
int dashIndex, dashRemain;
|
|
unsigned char *pDash;
|
|
double L, l;
|
|
double k;
|
|
PolyVertexRec vertices[4];
|
|
PolyVertexRec saveRight, saveBottom;
|
|
PolySlopeRec slopes[4];
|
|
PolyEdgeRec left[4], right[4];
|
|
LineFaceRec lcapFace, rcapFace;
|
|
int nleft, nright;
|
|
int h;
|
|
int y;
|
|
int dy, dx;
|
|
unsigned long pixel;
|
|
double LRemain;
|
|
double r;
|
|
double rdx, rdy;
|
|
double dashDx, dashDy;
|
|
double saveK = 0.0;
|
|
Bool first = TRUE;
|
|
double lcenterx, lcentery, rcenterx = 0.0, rcentery = 0.0;
|
|
unsigned long fgPixel, bgPixel;
|
|
|
|
dx = x2 - x1;
|
|
dy = y2 - y1;
|
|
dashIndex = *pDashIndex;
|
|
pDash = pGC->dash;
|
|
dashRemain = pDash[dashIndex] - *pDashOffset;
|
|
fgPixel = pGC->fgPixel;
|
|
bgPixel = pGC->bgPixel;
|
|
if (pGC->fillStyle == FillOpaqueStippled || pGC->fillStyle == FillTiled) {
|
|
bgPixel = fgPixel;
|
|
}
|
|
|
|
l = ((double) pGC->lineWidth) / 2.0;
|
|
if (dx == 0) {
|
|
L = dy;
|
|
rdx = 0;
|
|
rdy = l;
|
|
if (dy < 0) {
|
|
L = -dy;
|
|
rdy = -l;
|
|
}
|
|
}
|
|
else if (dy == 0) {
|
|
L = dx;
|
|
rdx = l;
|
|
rdy = 0;
|
|
if (dx < 0) {
|
|
L = -dx;
|
|
rdx = -l;
|
|
}
|
|
}
|
|
else {
|
|
L = hypot((double) dx, (double) dy);
|
|
r = l / L;
|
|
|
|
rdx = r * dx;
|
|
rdy = r * dy;
|
|
}
|
|
k = l * L;
|
|
LRemain = L;
|
|
/* All position comments are relative to a line with dx and dy > 0,
|
|
* but the code does not depend on this */
|
|
/* top */
|
|
slopes[V_TOP].dx = dx;
|
|
slopes[V_TOP].dy = dy;
|
|
slopes[V_TOP].k = k;
|
|
/* right */
|
|
slopes[V_RIGHT].dx = -dy;
|
|
slopes[V_RIGHT].dy = dx;
|
|
slopes[V_RIGHT].k = 0;
|
|
/* bottom */
|
|
slopes[V_BOTTOM].dx = -dx;
|
|
slopes[V_BOTTOM].dy = -dy;
|
|
slopes[V_BOTTOM].k = k;
|
|
/* left */
|
|
slopes[V_LEFT].dx = dy;
|
|
slopes[V_LEFT].dy = -dx;
|
|
slopes[V_LEFT].k = 0;
|
|
|
|
/* preload the start coordinates */
|
|
vertices[V_RIGHT].x = vertices[V_TOP].x = rdy;
|
|
vertices[V_RIGHT].y = vertices[V_TOP].y = -rdx;
|
|
|
|
vertices[V_BOTTOM].x = vertices[V_LEFT].x = -rdy;
|
|
vertices[V_BOTTOM].y = vertices[V_LEFT].y = rdx;
|
|
|
|
if (projectLeft) {
|
|
vertices[V_TOP].x -= rdx;
|
|
vertices[V_TOP].y -= rdy;
|
|
|
|
vertices[V_LEFT].x -= rdx;
|
|
vertices[V_LEFT].y -= rdy;
|
|
|
|
slopes[V_LEFT].k = rdx * dx + rdy * dy;
|
|
}
|
|
|
|
lcenterx = x1;
|
|
lcentery = y1;
|
|
|
|
if (pGC->capStyle == CapRound) {
|
|
lcapFace.dx = dx;
|
|
lcapFace.dy = dy;
|
|
lcapFace.x = x1;
|
|
lcapFace.y = y1;
|
|
|
|
rcapFace.dx = -dx;
|
|
rcapFace.dy = -dy;
|
|
rcapFace.x = x1;
|
|
rcapFace.y = y1;
|
|
}
|
|
while (LRemain > dashRemain) {
|
|
dashDx = (dashRemain * dx) / L;
|
|
dashDy = (dashRemain * dy) / L;
|
|
|
|
rcenterx = lcenterx + dashDx;
|
|
rcentery = lcentery + dashDy;
|
|
|
|
vertices[V_RIGHT].x += dashDx;
|
|
vertices[V_RIGHT].y += dashDy;
|
|
|
|
vertices[V_BOTTOM].x += dashDx;
|
|
vertices[V_BOTTOM].y += dashDy;
|
|
|
|
slopes[V_RIGHT].k = vertices[V_RIGHT].x * dx + vertices[V_RIGHT].y * dy;
|
|
|
|
if (pGC->lineStyle == LineDoubleDash || !(dashIndex & 1)) {
|
|
if (pGC->lineStyle == LineOnOffDash &&
|
|
pGC->capStyle == CapProjecting) {
|
|
saveRight = vertices[V_RIGHT];
|
|
saveBottom = vertices[V_BOTTOM];
|
|
saveK = slopes[V_RIGHT].k;
|
|
|
|
if (!first) {
|
|
vertices[V_TOP].x -= rdx;
|
|
vertices[V_TOP].y -= rdy;
|
|
|
|
vertices[V_LEFT].x -= rdx;
|
|
vertices[V_LEFT].y -= rdy;
|
|
|
|
slopes[V_LEFT].k = vertices[V_LEFT].x *
|
|
slopes[V_LEFT].dy -
|
|
vertices[V_LEFT].y * slopes[V_LEFT].dx;
|
|
}
|
|
|
|
vertices[V_RIGHT].x += rdx;
|
|
vertices[V_RIGHT].y += rdy;
|
|
|
|
vertices[V_BOTTOM].x += rdx;
|
|
vertices[V_BOTTOM].y += rdy;
|
|
|
|
slopes[V_RIGHT].k = vertices[V_RIGHT].x *
|
|
slopes[V_RIGHT].dy -
|
|
vertices[V_RIGHT].y * slopes[V_RIGHT].dx;
|
|
}
|
|
y = miPolyBuildPoly(vertices, slopes, 4, x1, y1,
|
|
left, right, &nleft, &nright, &h);
|
|
pixel = (dashIndex & 1) ? bgPixel : fgPixel;
|
|
miFillPolyHelper(pDrawable, pGC, pixel, spanData, y, h, left, right,
|
|
nleft, nright);
|
|
|
|
if (pGC->lineStyle == LineOnOffDash) {
|
|
switch (pGC->capStyle) {
|
|
case CapProjecting:
|
|
vertices[V_BOTTOM] = saveBottom;
|
|
vertices[V_RIGHT] = saveRight;
|
|
slopes[V_RIGHT].k = saveK;
|
|
break;
|
|
case CapRound:
|
|
if (!first) {
|
|
if (dx < 0) {
|
|
lcapFace.xa = -vertices[V_LEFT].x;
|
|
lcapFace.ya = -vertices[V_LEFT].y;
|
|
lcapFace.k = slopes[V_LEFT].k;
|
|
}
|
|
else {
|
|
lcapFace.xa = vertices[V_TOP].x;
|
|
lcapFace.ya = vertices[V_TOP].y;
|
|
lcapFace.k = -slopes[V_LEFT].k;
|
|
}
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
&lcapFace, (LineFacePtr) NULL,
|
|
lcenterx, lcentery, FALSE);
|
|
}
|
|
if (dx < 0) {
|
|
rcapFace.xa = vertices[V_BOTTOM].x;
|
|
rcapFace.ya = vertices[V_BOTTOM].y;
|
|
rcapFace.k = slopes[V_RIGHT].k;
|
|
}
|
|
else {
|
|
rcapFace.xa = -vertices[V_RIGHT].x;
|
|
rcapFace.ya = -vertices[V_RIGHT].y;
|
|
rcapFace.k = -slopes[V_RIGHT].k;
|
|
}
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
(LineFacePtr) NULL, &rcapFace,
|
|
rcenterx, rcentery, FALSE);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
LRemain -= dashRemain;
|
|
++dashIndex;
|
|
if (dashIndex == pGC->numInDashList)
|
|
dashIndex = 0;
|
|
dashRemain = pDash[dashIndex];
|
|
|
|
lcenterx = rcenterx;
|
|
lcentery = rcentery;
|
|
|
|
vertices[V_TOP] = vertices[V_RIGHT];
|
|
vertices[V_LEFT] = vertices[V_BOTTOM];
|
|
slopes[V_LEFT].k = -slopes[V_RIGHT].k;
|
|
first = FALSE;
|
|
}
|
|
|
|
if (pGC->lineStyle == LineDoubleDash || !(dashIndex & 1)) {
|
|
vertices[V_TOP].x -= dx;
|
|
vertices[V_TOP].y -= dy;
|
|
|
|
vertices[V_LEFT].x -= dx;
|
|
vertices[V_LEFT].y -= dy;
|
|
|
|
vertices[V_RIGHT].x = rdy;
|
|
vertices[V_RIGHT].y = -rdx;
|
|
|
|
vertices[V_BOTTOM].x = -rdy;
|
|
vertices[V_BOTTOM].y = rdx;
|
|
|
|
if (projectRight) {
|
|
vertices[V_RIGHT].x += rdx;
|
|
vertices[V_RIGHT].y += rdy;
|
|
|
|
vertices[V_BOTTOM].x += rdx;
|
|
vertices[V_BOTTOM].y += rdy;
|
|
slopes[V_RIGHT].k = vertices[V_RIGHT].x *
|
|
slopes[V_RIGHT].dy - vertices[V_RIGHT].y * slopes[V_RIGHT].dx;
|
|
}
|
|
else
|
|
slopes[V_RIGHT].k = 0;
|
|
|
|
if (!first && pGC->lineStyle == LineOnOffDash &&
|
|
pGC->capStyle == CapProjecting) {
|
|
vertices[V_TOP].x -= rdx;
|
|
vertices[V_TOP].y -= rdy;
|
|
|
|
vertices[V_LEFT].x -= rdx;
|
|
vertices[V_LEFT].y -= rdy;
|
|
slopes[V_LEFT].k = vertices[V_LEFT].x *
|
|
slopes[V_LEFT].dy - vertices[V_LEFT].y * slopes[V_LEFT].dx;
|
|
}
|
|
else
|
|
slopes[V_LEFT].k += dx * dx + dy * dy;
|
|
|
|
y = miPolyBuildPoly(vertices, slopes, 4, x2, y2,
|
|
left, right, &nleft, &nright, &h);
|
|
|
|
pixel = (dashIndex & 1) ? pGC->bgPixel : pGC->fgPixel;
|
|
miFillPolyHelper(pDrawable, pGC, pixel, spanData, y, h, left, right,
|
|
nleft, nright);
|
|
if (!first && pGC->lineStyle == LineOnOffDash &&
|
|
pGC->capStyle == CapRound) {
|
|
lcapFace.x = x2;
|
|
lcapFace.y = y2;
|
|
if (dx < 0) {
|
|
lcapFace.xa = -vertices[V_LEFT].x;
|
|
lcapFace.ya = -vertices[V_LEFT].y;
|
|
lcapFace.k = slopes[V_LEFT].k;
|
|
}
|
|
else {
|
|
lcapFace.xa = vertices[V_TOP].x;
|
|
lcapFace.ya = vertices[V_TOP].y;
|
|
lcapFace.k = -slopes[V_LEFT].k;
|
|
}
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
&lcapFace, (LineFacePtr) NULL, rcenterx, rcentery, FALSE);
|
|
}
|
|
}
|
|
dashRemain = ((double) dashRemain) - LRemain;
|
|
if (dashRemain == 0) {
|
|
dashIndex++;
|
|
if (dashIndex == pGC->numInDashList)
|
|
dashIndex = 0;
|
|
dashRemain = pDash[dashIndex];
|
|
}
|
|
|
|
leftFace->x = x1;
|
|
leftFace->y = y1;
|
|
leftFace->dx = dx;
|
|
leftFace->dy = dy;
|
|
leftFace->xa = rdy;
|
|
leftFace->ya = -rdx;
|
|
leftFace->k = k;
|
|
|
|
rightFace->x = x2;
|
|
rightFace->y = y2;
|
|
rightFace->dx = -dx;
|
|
rightFace->dy = -dy;
|
|
rightFace->xa = -rdy;
|
|
rightFace->ya = rdx;
|
|
rightFace->k = k;
|
|
|
|
*pDashIndex = dashIndex;
|
|
*pDashOffset = pDash[dashIndex] - dashRemain;
|
|
}
|
|
|
|
void
|
|
miWideDash(DrawablePtr pDrawable, GCPtr pGC,
|
|
int mode, int npt, DDXPointPtr pPts)
|
|
{
|
|
int x1, y1, x2, y2;
|
|
unsigned long pixel;
|
|
Bool projectLeft, projectRight;
|
|
LineFaceRec leftFace, rightFace, prevRightFace;
|
|
LineFaceRec firstFace;
|
|
int first;
|
|
int dashIndex, dashOffset;
|
|
int prevDashIndex;
|
|
SpanDataRec spanDataRec;
|
|
SpanDataPtr spanData;
|
|
Bool somethingDrawn = FALSE;
|
|
Bool selfJoin;
|
|
Bool endIsFg = FALSE, startIsFg = FALSE;
|
|
Bool firstIsFg = FALSE, prevIsFg = FALSE;
|
|
|
|
#if 0
|
|
/* XXX backward compatibility */
|
|
if (pGC->lineWidth == 0) {
|
|
miZeroDashLine(pDrawable, pGC, mode, npt, pPts);
|
|
return;
|
|
}
|
|
#endif
|
|
if (pGC->lineStyle == LineDoubleDash &&
|
|
(pGC->fillStyle == FillOpaqueStippled || pGC->fillStyle == FillTiled)) {
|
|
miWideLine(pDrawable, pGC, mode, npt, pPts);
|
|
return;
|
|
}
|
|
if (npt == 0)
|
|
return;
|
|
spanData = miSetupSpanData(pGC, &spanDataRec, npt);
|
|
x2 = pPts->x;
|
|
y2 = pPts->y;
|
|
first = TRUE;
|
|
selfJoin = FALSE;
|
|
if (mode == CoordModePrevious) {
|
|
int nptTmp;
|
|
DDXPointPtr pPtsTmp;
|
|
|
|
x1 = x2;
|
|
y1 = y2;
|
|
nptTmp = npt;
|
|
pPtsTmp = pPts + 1;
|
|
while (--nptTmp) {
|
|
x1 += pPtsTmp->x;
|
|
y1 += pPtsTmp->y;
|
|
++pPtsTmp;
|
|
}
|
|
if (x2 == x1 && y2 == y1)
|
|
selfJoin = TRUE;
|
|
}
|
|
else if (x2 == pPts[npt - 1].x && y2 == pPts[npt - 1].y) {
|
|
selfJoin = TRUE;
|
|
}
|
|
projectLeft = pGC->capStyle == CapProjecting && !selfJoin;
|
|
projectRight = FALSE;
|
|
dashIndex = 0;
|
|
dashOffset = 0;
|
|
miStepDash((int) pGC->dashOffset, &dashIndex,
|
|
pGC->dash, (int) pGC->numInDashList, &dashOffset);
|
|
while (--npt) {
|
|
x1 = x2;
|
|
y1 = y2;
|
|
++pPts;
|
|
x2 = pPts->x;
|
|
y2 = pPts->y;
|
|
if (mode == CoordModePrevious) {
|
|
x2 += x1;
|
|
y2 += y1;
|
|
}
|
|
if (x1 != x2 || y1 != y2) {
|
|
somethingDrawn = TRUE;
|
|
if (npt == 1 && pGC->capStyle == CapProjecting &&
|
|
(!selfJoin || !firstIsFg))
|
|
projectRight = TRUE;
|
|
prevDashIndex = dashIndex;
|
|
miWideDashSegment(pDrawable, pGC, spanData, &dashOffset, &dashIndex,
|
|
x1, y1, x2, y2,
|
|
projectLeft, projectRight, &leftFace, &rightFace);
|
|
startIsFg = !(prevDashIndex & 1);
|
|
endIsFg = (dashIndex & 1) ^ (dashOffset != 0);
|
|
if (pGC->lineStyle == LineDoubleDash || startIsFg) {
|
|
pixel = startIsFg ? pGC->fgPixel : pGC->bgPixel;
|
|
if (first || (pGC->lineStyle == LineOnOffDash && !prevIsFg)) {
|
|
if (first && selfJoin) {
|
|
firstFace = leftFace;
|
|
firstIsFg = startIsFg;
|
|
}
|
|
else if (pGC->capStyle == CapRound)
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
&leftFace, (LineFacePtr) NULL,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
}
|
|
else {
|
|
miLineJoin(pDrawable, pGC, pixel, spanData, &leftFace,
|
|
&prevRightFace);
|
|
}
|
|
}
|
|
prevRightFace = rightFace;
|
|
prevIsFg = endIsFg;
|
|
first = FALSE;
|
|
projectLeft = FALSE;
|
|
}
|
|
if (npt == 1 && somethingDrawn) {
|
|
if (pGC->lineStyle == LineDoubleDash || endIsFg) {
|
|
pixel = endIsFg ? pGC->fgPixel : pGC->bgPixel;
|
|
if (selfJoin && (pGC->lineStyle == LineDoubleDash || firstIsFg)) {
|
|
miLineJoin(pDrawable, pGC, pixel, spanData, &firstFace,
|
|
&rightFace);
|
|
}
|
|
else {
|
|
if (pGC->capStyle == CapRound)
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
(LineFacePtr) NULL, &rightFace,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
}
|
|
}
|
|
else {
|
|
/* glue a cap to the start of the line if
|
|
* we're OnOffDash and ended on odd dash
|
|
*/
|
|
if (selfJoin && firstIsFg) {
|
|
pixel = pGC->fgPixel;
|
|
if (pGC->capStyle == CapProjecting)
|
|
miLineProjectingCap(pDrawable, pGC, pixel, spanData,
|
|
&firstFace, TRUE,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
else if (pGC->capStyle == CapRound)
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
&firstFace, (LineFacePtr) NULL,
|
|
(double) 0.0, (double) 0.0, TRUE);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* handle crock where all points are coincident */
|
|
if (!somethingDrawn &&
|
|
(pGC->lineStyle == LineDoubleDash || !(dashIndex & 1))) {
|
|
/* not the same as endIsFg computation above */
|
|
pixel = (dashIndex & 1) ? pGC->bgPixel : pGC->fgPixel;
|
|
switch (pGC->capStyle) {
|
|
case CapRound:
|
|
miLineArc(pDrawable, pGC, pixel, spanData,
|
|
(LineFacePtr) NULL, (LineFacePtr) NULL,
|
|
(double) x2, (double) y2, FALSE);
|
|
break;
|
|
case CapProjecting:
|
|
x1 = pGC->lineWidth;
|
|
miFillRectPolyHelper(pDrawable, pGC, pixel, spanData,
|
|
x2 - (x1 >> 1), y2 - (x1 >> 1), x1, x1);
|
|
break;
|
|
}
|
|
}
|
|
if (spanData)
|
|
miCleanupSpanData(pDrawable, pGC, spanData);
|
|
}
|