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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPathOpsBounds.h"
#include "SkPathOpsRect.h"
#include "SkPathOpsCurve.h"
SkDPoint SkDCurve::conicTop(const SkPoint curve[3], SkScalar curveWeight,
double startT, double endT, double* topT) {
SkDPoint topPt = fConic[0];
*topT = startT;
if (topPt.fY > fConic[2].fY || (topPt.fY == fConic[2].fY && topPt.fX > fConic[2].fX)) {
*topT = endT;
topPt = fConic[2];
}
if (!fConic.monotonicInY()) {
double extremeT;
if (SkDConic::FindExtrema(&fConic.fPts.fPts[0].fY, fConic.fWeight, &extremeT)) {
SkDConic dCurve;
dCurve.set(curve, curveWeight);
extremeT = startT + (endT - startT) * extremeT;
SkDPoint test = dCurve.ptAtT(extremeT);
if (topPt.fY > test.fY || (topPt.fY == test.fY && topPt.fX > test.fX)) {
*topT = extremeT;
topPt = test;
}
}
}
return topPt;
}
SkDPoint SkDCurve::cubicTop(const SkPoint curve[4], SkScalar ,
double startT, double endT, double* topT) {
SkDPoint topPt = fCubic[0];
*topT = startT;
if (topPt.fY > fCubic[3].fY || (topPt.fY == fCubic[3].fY && topPt.fX > fCubic[3].fX)) {
*topT = endT;
topPt = fCubic[3];
}
double extremeTs[2];
if (!fCubic.monotonicInY()) {
int roots = SkDCubic::FindExtrema(&fCubic.fPts[0].fY, extremeTs);
SkDCubic dCurve;
dCurve.set(curve);
for (int index = 0; index < roots; ++index) {
double t = startT + (endT - startT) * extremeTs[index];
SkDPoint mid = dCurve.ptAtT(t);
if (topPt.fY > mid.fY || (topPt.fY == mid.fY && topPt.fX > mid.fX)) {
*topT = t;
topPt = mid;
}
}
}
return topPt;
}
SkDPoint SkDCurve::lineTop(const SkPoint[2], SkScalar , double startT, double endT, double* topT) {
SkDPoint topPt = fLine[0];
*topT = startT;
if (topPt.fY > fLine[1].fY || (topPt.fY == fLine[1].fY && topPt.fX > fLine[1].fX)) {
*topT = endT;
topPt = fLine[1];
}
return topPt;
}
SkDPoint SkDCurve::quadTop(const SkPoint curve[3], SkScalar ,
double startT, double endT, double* topT) {
SkDPoint topPt = fQuad[0];
*topT = startT;
if (topPt.fY > fQuad[2].fY || (topPt.fY == fQuad[2].fY && topPt.fX > fQuad[2].fX)) {
*topT = endT;
topPt = fQuad[2];
}
if (!fQuad.monotonicInY()) {
double extremeT;
if (SkDQuad::FindExtrema(&fQuad.fPts[0].fY, &extremeT)) {
SkDQuad dCurve;
dCurve.set(curve);
extremeT = startT + (endT - startT) * extremeT;
SkDPoint test = dCurve.ptAtT(extremeT);
if (topPt.fY > test.fY || (topPt.fY == test.fY && topPt.fX > test.fX)) {
*topT = extremeT;
topPt = test;
}
}
}
return topPt;
}
SkDPoint (SkDCurve::* const Top[])(const SkPoint curve[], SkScalar curveWeight,
double tStart, double tEnd, double* topT) = {
NULL,
&SkDCurve::lineTop,
&SkDCurve::quadTop,
&SkDCurve::conicTop,
&SkDCurve::cubicTop
};
void SkDCurve::setConicBounds(const SkPoint curve[3], SkScalar curveWeight,
double tStart, double tEnd, SkPathOpsBounds* bounds) {
SkDConic dCurve;
dCurve.set(curve, curveWeight);
SkDRect dRect;
dRect.setBounds(dCurve, fConic, tStart, tEnd);
bounds->set(SkDoubleToScalar(dRect.fLeft), SkDoubleToScalar(dRect.fTop),
SkDoubleToScalar(dRect.fRight), SkDoubleToScalar(dRect.fBottom));
}
void SkDCurve::setCubicBounds(const SkPoint curve[4], SkScalar ,
double tStart, double tEnd, SkPathOpsBounds* bounds) {
SkDCubic dCurve;
dCurve.set(curve);
SkDRect dRect;
dRect.setBounds(dCurve, fCubic, tStart, tEnd);
bounds->set(SkDoubleToScalar(dRect.fLeft), SkDoubleToScalar(dRect.fTop),
SkDoubleToScalar(dRect.fRight), SkDoubleToScalar(dRect.fBottom));
}
void SkDCurve::setLineBounds(const SkPoint[2], SkScalar ,
double , double , SkPathOpsBounds* bounds) {
bounds->setPointBounds(fLine[0]);
bounds->add(fLine[1]);
}
void SkDCurve::setQuadBounds(const SkPoint curve[3], SkScalar ,
double tStart, double tEnd, SkPathOpsBounds* bounds) {
SkDQuad dCurve;
dCurve.set(curve);
SkDRect dRect;
dRect.setBounds(dCurve, fQuad, tStart, tEnd);
bounds->set(SkDoubleToScalar(dRect.fLeft), SkDoubleToScalar(dRect.fTop),
SkDoubleToScalar(dRect.fRight), SkDoubleToScalar(dRect.fBottom));
}
void (SkDCurve::* const SetBounds[])(const SkPoint curve[], SkScalar curveWeight,
double tStart, double tEnd, SkPathOpsBounds* bounds) = {
NULL,
&SkDCurve::setLineBounds,
&SkDCurve::setQuadBounds,
&SkDCurve::setConicBounds,
&SkDCurve::setCubicBounds
};
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