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Fastpath lines in SkCurveMeasure

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BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2229403004

Review-Url: https://codereview.chromium.org/2229403004
This commit is contained in:
hstern 2016-08-10 11:12:22 -07:00 committed by Commit bot
parent f9635999a4
commit 386ba54061
1 changed files with 7 additions and 13 deletions
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18
src/utils/SkCurveMeasure.cpp
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@ -77,10 +77,6 @@ static inline Sk8f evaluateDerivativeLength(const Sk8f& ts,
x = xCoeff[0]*ts + xCoeff[1]; x = xCoeff[0]*ts + xCoeff[1];
y = yCoeff[0]*ts + yCoeff[1]; y = yCoeff[0]*ts + yCoeff[1];
break; break;
case kLine_SegType:
// length of line derivative is constant
// and we precompute it in the constructor
return xCoeff[0];
case kCubic_SegType: case kCubic_SegType:
x = (xCoeff[0]*ts + xCoeff[1])*ts + xCoeff[2]; x = (xCoeff[0]*ts + xCoeff[1])*ts + xCoeff[2];
y = (yCoeff[0]*ts + yCoeff[1])*ts + yCoeff[2]; y = (yCoeff[0]*ts + yCoeff[1])*ts + yCoeff[2];
@ -117,14 +113,6 @@ ArcLengthIntegrator::ArcLengthIntegrator(const SkPoint* pts, SkSegType segType)
yCoeff[1] = Sk8f(2.0f*(By - Ay)); yCoeff[1] = Sk8f(2.0f*(By - Ay));
} }
break; break;
case kLine_SegType: {
// the length of the derivative of a line is constant
// we put in in both coeff arrays for consistency's sake
SkScalar length = (pts[1] - pts[0]).length();
xCoeff[0] = Sk8f(length);
yCoeff[0] = Sk8f(length);
}
break;
case kCubic_SegType: case kCubic_SegType:
{ {
float Ax = pts[0].x(); float Ax = pts[0].x();
@ -183,6 +171,7 @@ SkCurveMeasure::SkCurveMeasure(const SkPoint* pts, SkSegType segType)
case SkSegType::kLine_SegType: case SkSegType::kLine_SegType:
fPts[0] = pts[0]; fPts[0] = pts[0];
fPts[1] = pts[1]; fPts[1] = pts[1];
fLength = (fPts[1] - fPts[0]).length();
break; break;
case SkSegType::kCubic_SegType: case SkSegType::kCubic_SegType:
for (size_t i = 0; i < 4; i++) { for (size_t i = 0; i < 4; i++) {
@ -198,8 +187,10 @@ SkCurveMeasure::SkCurveMeasure(const SkPoint* pts, SkSegType segType)
UNIMPLEMENTED; UNIMPLEMENTED;
break; break;
} }
if (kLine_SegType != segType) {
fIntegrator = ArcLengthIntegrator(fPts, fSegType); fIntegrator = ArcLengthIntegrator(fPts, fSegType);
} }
}
SkScalar SkCurveMeasure::getLength() { SkScalar SkCurveMeasure::getLength() {
if (-1.0f == fLength) { if (-1.0f == fLength) {
@ -227,6 +218,9 @@ SkScalar SkCurveMeasure::getTime(SkScalar targetLength) {
if (SkScalarNearlyEqual(targetLength, currentLength)) { if (SkScalarNearlyEqual(targetLength, currentLength)) {
return 1.0f; return 1.0f;
} }
if (kLine_SegType == fSegType) {
return targetLength / currentLength;
}
// initial estimate of t is percentage of total length // initial estimate of t is percentage of total length
SkScalar currentT = targetLength / currentLength; SkScalar currentT = targetLength / currentLength;