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438 lines
11 KiB
438 lines
11 KiB
//========================================================================
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//
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// SplashXPath.cc
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//
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//========================================================================
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#include <aconf.h>
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#ifdef USE_GCC_PRAGMAS
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#pragma implementation
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "gmem.h"
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#include "SplashMath.h"
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#include "SplashPath.h"
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#include "SplashXPath.h"
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//------------------------------------------------------------------------
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struct SplashXPathPoint {
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SplashCoord x, y;
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};
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struct SplashXPathAdjust {
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int firstPt, lastPt; // range of points
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GBool vert; // vertical or horizontal hint
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SplashCoord x0a, x0b, // hint boundaries
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xma, xmb,
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x1a, x1b;
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SplashCoord x0, x1, xm; // adjusted coordinates
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};
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//------------------------------------------------------------------------
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// Transform a point from user space to device space.
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inline void SplashXPath::transform(SplashCoord *matrix,
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SplashCoord xi, SplashCoord yi,
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SplashCoord *xo, SplashCoord *yo) {
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// [ m[0] m[1] 0 ]
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// [xo yo 1] = [xi yi 1] * [ m[2] m[3] 0 ]
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// [ m[4] m[5] 1 ]
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*xo = xi * matrix[0] + yi * matrix[2] + matrix[4];
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*yo = xi * matrix[1] + yi * matrix[3] + matrix[5];
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}
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//------------------------------------------------------------------------
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// SplashXPath
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//------------------------------------------------------------------------
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SplashXPath::SplashXPath() {
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segs = NULL;
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length = size = 0;
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}
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SplashXPath::SplashXPath(SplashPath *path, SplashCoord *matrix,
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SplashCoord flatness, GBool closeSubpaths) {
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SplashPathHint *hint;
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SplashXPathPoint *pts;
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SplashXPathAdjust *adjusts, *adjust;
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SplashCoord x0, y0, x1, y1, x2, y2, x3, y3, xsp, ysp;
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SplashCoord adj0, adj1, w;
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int ww;
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int curSubpath, curSubpathX, i, j;
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// transform the points
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pts = (SplashXPathPoint *)gmallocn(path->length, sizeof(SplashXPathPoint));
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for (i = 0; i < path->length; ++i) {
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transform(matrix, path->pts[i].x, path->pts[i].y, &pts[i].x, &pts[i].y);
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}
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// set up the stroke adjustment hints
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if (path->hints) {
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adjusts = (SplashXPathAdjust *)gmallocn(path->hintsLength,
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sizeof(SplashXPathAdjust));
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for (i = 0; i < path->hintsLength; ++i) {
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hint = &path->hints[i];
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x0 = pts[hint->ctrl0 ].x; y0 = pts[hint->ctrl0 ].y;
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x1 = pts[hint->ctrl0 + 1].x; y1 = pts[hint->ctrl0 + 1].y;
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x2 = pts[hint->ctrl1 ].x; y2 = pts[hint->ctrl1 ].y;
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x3 = pts[hint->ctrl1 + 1].x; y3 = pts[hint->ctrl1 + 1].y;
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if (x0 == x1 && x2 == x3) {
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adjusts[i].vert = gTrue;
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adj0 = x0;
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adj1 = x2;
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} else if (y0 == y1 && y2 == y3) {
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adjusts[i].vert = gFalse;
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adj0 = y0;
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adj1 = y2;
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} else {
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gfree(adjusts);
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adjusts = NULL;
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break;
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}
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if (adj0 > adj1) {
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x0 = adj0;
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adj0 = adj1;
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adj1 = x0;
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}
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w = adj1 - adj0;
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ww = splashRound(w);
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if (ww == 0) {
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ww = 1;
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}
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adjusts[i].x0a = adj0 - 0.01;
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adjusts[i].x0b = adj0 + 0.01;
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adjusts[i].xma = (SplashCoord)0.5 * (adj0 + adj1) - 0.01;
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adjusts[i].xmb = (SplashCoord)0.5 * (adj0 + adj1) + 0.01;
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adjusts[i].x1a = adj1 - 0.01;
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adjusts[i].x1b = adj1 + 0.01;
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adjusts[i].x0 = (SplashCoord)splashRound(adj0);
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adjusts[i].x1 = adjusts[i].x0 + ww - 0.01;
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adjusts[i].xm = (SplashCoord)0.5 * (adjusts[i].x0 + adjusts[i].x1);
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adjusts[i].firstPt = hint->firstPt;
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adjusts[i].lastPt = hint->lastPt;
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}
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} else {
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adjusts = NULL;
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}
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// perform stroke adjustment
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if (adjusts) {
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for (i = 0, adjust = adjusts; i < path->hintsLength; ++i, ++adjust) {
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for (j = adjust->firstPt; j <= adjust->lastPt; ++j) {
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strokeAdjust(adjust, &pts[j].x, &pts[j].y);
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}
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}
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gfree(adjusts);
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}
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segs = NULL;
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length = size = 0;
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x0 = y0 = xsp = ysp = 0; // make gcc happy
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adj0 = adj1 = 0; // make gcc happy
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curSubpath = 0;
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curSubpathX = 0;
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i = 0;
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while (i < path->length) {
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// first point in subpath - skip it
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if (path->flags[i] & splashPathFirst) {
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x0 = pts[i].x;
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y0 = pts[i].y;
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xsp = x0;
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ysp = y0;
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curSubpath = i;
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curSubpathX = length;
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++i;
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} else {
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// curve segment
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if (path->flags[i] & splashPathCurve) {
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x1 = pts[i].x;
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y1 = pts[i].y;
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x2 = pts[i+1].x;
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y2 = pts[i+1].y;
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x3 = pts[i+2].x;
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y3 = pts[i+2].y;
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addCurve(x0, y0, x1, y1, x2, y2, x3, y3,
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flatness,
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(path->flags[i-1] & splashPathFirst),
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(path->flags[i+2] & splashPathLast),
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!closeSubpaths &&
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(path->flags[i-1] & splashPathFirst) &&
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!(path->flags[i-1] & splashPathClosed),
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!closeSubpaths &&
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(path->flags[i+2] & splashPathLast) &&
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!(path->flags[i+2] & splashPathClosed));
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x0 = x3;
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y0 = y3;
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i += 3;
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// line segment
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} else {
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x1 = pts[i].x;
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y1 = pts[i].y;
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addSegment(x0, y0, x1, y1,
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path->flags[i-1] & splashPathFirst,
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path->flags[i] & splashPathLast,
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!closeSubpaths &&
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(path->flags[i-1] & splashPathFirst) &&
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!(path->flags[i-1] & splashPathClosed),
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!closeSubpaths &&
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(path->flags[i] & splashPathLast) &&
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!(path->flags[i] & splashPathClosed));
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x0 = x1;
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y0 = y1;
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++i;
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}
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// close a subpath
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if (closeSubpaths &&
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(path->flags[i-1] & splashPathLast) &&
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(pts[i-1].x != pts[curSubpath].x ||
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pts[i-1].y != pts[curSubpath].y)) {
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addSegment(x0, y0, xsp, ysp,
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gFalse, gTrue, gFalse, gFalse);
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}
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}
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}
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gfree(pts);
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}
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// Apply the stroke adjust hints to point <pt>: (*<xp>, *<yp>).
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void SplashXPath::strokeAdjust(SplashXPathAdjust *adjust,
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SplashCoord *xp, SplashCoord *yp) {
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SplashCoord x, y;
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if (adjust->vert) {
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x = *xp;
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if (x > adjust->x0a && x < adjust->x0b) {
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*xp = adjust->x0;
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} else if (x > adjust->xma && x < adjust->xmb) {
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*xp = adjust->xm;
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} else if (x > adjust->x1a && x < adjust->x1b) {
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*xp = adjust->x1;
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}
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} else {
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y = *yp;
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if (y > adjust->x0a && y < adjust->x0b) {
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*yp = adjust->x0;
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} else if (y > adjust->xma && y < adjust->xmb) {
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*yp = adjust->xm;
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} else if (y > adjust->x1a && y < adjust->x1b) {
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*yp = adjust->x1;
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}
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}
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}
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SplashXPath::SplashXPath(SplashXPath *xPath) {
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length = xPath->length;
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size = xPath->size;
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segs = (SplashXPathSeg *)gmallocn(size, sizeof(SplashXPathSeg));
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memcpy(segs, xPath->segs, length * sizeof(SplashXPathSeg));
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}
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SplashXPath::~SplashXPath() {
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gfree(segs);
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}
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// Add space for <nSegs> more segments
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void SplashXPath::grow(int nSegs) {
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if (length + nSegs > size) {
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if (size == 0) {
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size = 32;
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}
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while (size < length + nSegs) {
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size *= 2;
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}
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segs = (SplashXPathSeg *)greallocn(segs, size, sizeof(SplashXPathSeg));
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}
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}
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void SplashXPath::addCurve(SplashCoord x0, SplashCoord y0,
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SplashCoord x1, SplashCoord y1,
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SplashCoord x2, SplashCoord y2,
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SplashCoord x3, SplashCoord y3,
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SplashCoord flatness,
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GBool first, GBool last, GBool end0, GBool end1) {
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SplashCoord cx[splashMaxCurveSplits + 1][3];
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SplashCoord cy[splashMaxCurveSplits + 1][3];
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int cNext[splashMaxCurveSplits + 1];
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SplashCoord xl0, xl1, xl2, xr0, xr1, xr2, xr3, xx1, xx2, xh;
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SplashCoord yl0, yl1, yl2, yr0, yr1, yr2, yr3, yy1, yy2, yh;
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SplashCoord dx, dy, mx, my, d1, d2, flatness2;
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int p1, p2, p3;
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flatness2 = flatness * flatness;
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// initial segment
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p1 = 0;
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p2 = splashMaxCurveSplits;
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cx[p1][0] = x0; cy[p1][0] = y0;
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cx[p1][1] = x1; cy[p1][1] = y1;
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cx[p1][2] = x2; cy[p1][2] = y2;
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cx[p2][0] = x3; cy[p2][0] = y3;
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cNext[p1] = p2;
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while (p1 < splashMaxCurveSplits) {
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// get the next segment
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xl0 = cx[p1][0]; yl0 = cy[p1][0];
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xx1 = cx[p1][1]; yy1 = cy[p1][1];
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xx2 = cx[p1][2]; yy2 = cy[p1][2];
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p2 = cNext[p1];
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xr3 = cx[p2][0]; yr3 = cy[p2][0];
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// compute the distances from the control points to the
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// midpoint of the straight line (this is a bit of a hack, but
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// it's much faster than computing the actual distances to the
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// line)
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mx = (xl0 + xr3) * 0.5;
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my = (yl0 + yr3) * 0.5;
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dx = xx1 - mx;
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dy = yy1 - my;
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d1 = dx*dx + dy*dy;
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dx = xx2 - mx;
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dy = yy2 - my;
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d2 = dx*dx + dy*dy;
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// if the curve is flat enough, or no more subdivisions are
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// allowed, add the straight line segment
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if (p2 - p1 == 1 || (d1 <= flatness2 && d2 <= flatness2)) {
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addSegment(xl0, yl0, xr3, yr3,
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p1 == 0 && first,
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p2 == splashMaxCurveSplits && last,
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p1 == 0 && end0,
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p2 == splashMaxCurveSplits && end1);
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p1 = p2;
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// otherwise, subdivide the curve
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} else {
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xl1 = (xl0 + xx1) * 0.5;
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yl1 = (yl0 + yy1) * 0.5;
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xh = (xx1 + xx2) * 0.5;
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yh = (yy1 + yy2) * 0.5;
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xl2 = (xl1 + xh) * 0.5;
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yl2 = (yl1 + yh) * 0.5;
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xr2 = (xx2 + xr3) * 0.5;
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yr2 = (yy2 + yr3) * 0.5;
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xr1 = (xh + xr2) * 0.5;
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yr1 = (yh + yr2) * 0.5;
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xr0 = (xl2 + xr1) * 0.5;
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yr0 = (yl2 + yr1) * 0.5;
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// add the new subdivision points
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p3 = (p1 + p2) / 2;
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cx[p1][1] = xl1; cy[p1][1] = yl1;
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cx[p1][2] = xl2; cy[p1][2] = yl2;
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cNext[p1] = p3;
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cx[p3][0] = xr0; cy[p3][0] = yr0;
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cx[p3][1] = xr1; cy[p3][1] = yr1;
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cx[p3][2] = xr2; cy[p3][2] = yr2;
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cNext[p3] = p2;
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}
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}
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}
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void SplashXPath::addSegment(SplashCoord x0, SplashCoord y0,
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SplashCoord x1, SplashCoord y1,
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GBool first, GBool last, GBool end0, GBool end1) {
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grow(1);
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segs[length].x0 = x0;
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segs[length].y0 = y0;
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segs[length].x1 = x1;
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segs[length].y1 = y1;
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segs[length].flags = 0;
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if (first) {
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segs[length].flags |= splashXPathFirst;
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}
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if (last) {
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segs[length].flags |= splashXPathLast;
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}
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if (end0) {
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segs[length].flags |= splashXPathEnd0;
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}
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if (end1) {
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segs[length].flags |= splashXPathEnd1;
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}
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if (y1 == y0) {
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segs[length].dxdy = segs[length].dydx = 0;
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segs[length].flags |= splashXPathHoriz;
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if (x1 == x0) {
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segs[length].flags |= splashXPathVert;
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}
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} else if (x1 == x0) {
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segs[length].dxdy = segs[length].dydx = 0;
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segs[length].flags |= splashXPathVert;
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} else {
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#if USE_FIXEDPOINT
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if (FixedPoint::divCheck(x1 - x0, y1 - y0, &segs[length].dxdy)) {
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segs[length].dydx = (SplashCoord)1 / segs[length].dxdy;
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} else {
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segs[length].dxdy = segs[length].dydx = 0;
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if (splashAbs(x1 - x0) > splashAbs(y1 - y0)) {
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segs[length].flags |= splashXPathHoriz;
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} else {
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segs[length].flags |= splashXPathVert;
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}
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}
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#else
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segs[length].dxdy = (x1 - x0) / (y1 - y0);
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segs[length].dydx = (SplashCoord)1 / segs[length].dxdy;
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#endif
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}
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if (y0 > y1) {
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segs[length].flags |= splashXPathFlip;
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}
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++length;
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}
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static int cmpXPathSegs(const void *arg0, const void *arg1) {
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SplashXPathSeg *seg0 = (SplashXPathSeg *)arg0;
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SplashXPathSeg *seg1 = (SplashXPathSeg *)arg1;
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SplashCoord x0, y0, x1, y1;
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if (seg0->flags & splashXPathFlip) {
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x0 = seg0->x1;
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y0 = seg0->y1;
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} else {
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x0 = seg0->x0;
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y0 = seg0->y0;
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}
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if (seg1->flags & splashXPathFlip) {
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x1 = seg1->x1;
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y1 = seg1->y1;
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} else {
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x1 = seg1->x0;
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y1 = seg1->y0;
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}
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if (y0 != y1) {
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return (y0 > y1) ? 1 : -1;
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}
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if (x0 != x1) {
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return (x0 > x1) ? 1 : -1;
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}
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return 0;
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}
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void SplashXPath::aaScale() {
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SplashXPathSeg *seg;
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int i;
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for (i = 0, seg = segs; i < length; ++i, ++seg) {
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seg->x0 *= splashAASize;
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seg->y0 *= splashAASize;
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seg->x1 *= splashAASize;
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seg->y1 *= splashAASize;
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}
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}
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void SplashXPath::sort() {
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qsort(segs, length, sizeof(SplashXPathSeg), &cmpXPathSegs);
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}
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