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#include "GrPath.h"
GrPath::GrPath() {}
GrPath::GrPath(const GrPath& src) : INHERITED() {
}
GrPath::GrPath(GrPathIter& iter) {
this->resetFromIter(&iter);
}
GrPath::~GrPath() {
}
void GrPath::ensureMoveTo() {
if (fVerbs.isEmpty() || this->wasLastVerb(kClose)) {
*fVerbs.append() = kMove;
fPts.append()->set(0, 0);
}
}
void GrPath::moveTo(GrScalar x, GrScalar y) {
if (this->wasLastVerb(kMove)) {
// overwrite prev kMove value
fPts[fPts.count() - 1].set(x, y);
} else {
*fVerbs.append() = kMove;
fPts.append()->set(x, y);
}
}
void GrPath::lineTo(GrScalar x, GrScalar y) {
this->ensureMoveTo();
*fVerbs.append() = kLine;
fPts.append()->set(x, y);
}
void GrPath::quadTo(GrScalar x0, GrScalar y0, GrScalar x1, GrScalar y1) {
this->ensureMoveTo();
*fVerbs.append() = kQuad;
fPts.append()->set(x0, y0);
fPts.append()->set(x1, y1);
}
void GrPath::cubicTo(GrScalar x0, GrScalar y0, GrScalar x1, GrScalar y1,
GrScalar x2, GrScalar y2) {
this->ensureMoveTo();
*fVerbs.append() = kCubic;
fPts.append()->set(x0, y0);
fPts.append()->set(x1, y1);
fPts.append()->set(x2, y2);
}
void GrPath::close() {
if (!fVerbs.isEmpty() && !this->wasLastVerb(kClose)) {
// should we allow kMove followed by kClose?
*fVerbs.append() = kClose;
}
}
///////////////////////////////////////////////////////////////////////////////
void GrPath::resetFromIter(GrPathIter* iter) {
fPts.reset();
fVerbs.reset();
GrPoint pts[4];
GrPathIter::Command cmd;
while ((cmd = iter->next(pts)) != GrPathIter::kEnd_Command) {
switch (cmd) {
case GrPathIter::kMove_Command:
this->moveTo(pts[0].fX, pts[0].fY);
break;
case GrPathIter::kLine_Command:
this->lineTo(pts[1].fX, pts[1].fY);
break;
case GrPathIter::kQuadratic_Command:
this->quadTo(pts[1].fX, pts[1].fY, pts[2].fX, pts[2].fY);
break;
case GrPathIter::kCubic_Command:
this->cubicTo(pts[1].fX, pts[1].fY, pts[2].fX, pts[2].fY,
pts[3].fX, pts[3].fY);
break;
case GrPathIter::kClose_Command:
this->close();
break;
case GrPathIter::kEnd_Command:
// never get here, but include it to avoid the warning
break;
}
}
}
///////////////////////////////////////////////////////////////////////////////
GrPath::Iter::Iter(const GrPath& path) : fPath(path) {
this->rewind();
}
GrPathIter::Command GrPath::Iter::next(GrPoint points[]) {
if (fVerbIndex == fPath.fVerbs.count()) {
GrAssert(fPtIndex == fPath.fPts.count());
return GrPathIter::kEnd_Command;
} else {
GrAssert(fVerbIndex < fPath.fVerbs.count());
}
uint8_t cmd = fPath.fVerbs[fVerbIndex++];
const GrPoint* srcPts = fPath.fPts.begin() + fPtIndex;
switch (cmd) {
case kMove:
if (points) {
points[0] = srcPts[0];
}
fLastPt = srcPts[0];
GrAssert(fPtIndex <= fPath.fPts.count() + 1);
fPtIndex += 1;
break;
case kLine:
if (points) {
points[0] = fLastPt;
points[1] = srcPts[0];
}
fLastPt = srcPts[0];
GrAssert(fPtIndex <= fPath.fPts.count() + 1);
fPtIndex += 1;
break;
case kQuad:
if (points) {
points[0] = fLastPt;
points[1] = srcPts[0];
points[2] = srcPts[1];
}
fLastPt = srcPts[2];
GrAssert(fPtIndex <= fPath.fPts.count() + 2);
fPtIndex += 2;
break;
case kCubic:
if (points) {
points[0] = fLastPt;
points[1] = srcPts[0];
points[2] = srcPts[1];
points[3] = srcPts[2];
}
fLastPt = srcPts[2];
GrAssert(fPtIndex <= fPath.fPts.count() + 3);
fPtIndex += 3;
break;
case kClose:
break;
default:
GrAssert(!"unknown grpath verb");
break;
}
return (GrPathIter::Command)cmd;
}
GrPathIter::ConvexHint GrPath::Iter::hint() const {
return fPath.getConvexHint();
}
GrPathIter::Command GrPath::Iter::next() {
return this->next(NULL);
}
void GrPath::Iter::rewind() {
fVerbIndex = fPtIndex = 0;
}
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