void SkDrawPath::parseSVG() {
fPath.reset();
const char* data = d.c_str();
SkPoint f = {0, 0};
SkPoint c = {0, 0};
SkPoint lastc = {0, 0};
SkPoint points[3];
char op = '\0';
char previousOp = '\0';
bool relative = false;
do {
data = skip_ws(data);
if (data[0] == '\0')
break;
char ch = data[0];
if (is_digit(ch) || ch == '-' || ch == '+') {
if (op == '\0')
return;
}
else {
op = ch;
relative = false;
if (islower(op)) {
op = (char) toupper(op);
relative = true;
}
data++;
data = skip_sep(data);
}
switch (op) {
case 'M':
data = find_points(data, points, 1, relative, &c);
fPath.moveTo(points[0]);
op = 'L';
c = points[0];
break;
case 'L':
data = find_points(data, points, 1, relative, &c);
fPath.lineTo(points[0]);
c = points[0];
break;
case 'H': {
SkScalar x;
data = find_scalar(data, &x, relative, c.fX);
fPath.lineTo(x, c.fY);
c.fX = x;
}
break;
case 'V': {
SkScalar y;
data = find_scalar(data, &y, relative, c.fY);
fPath.lineTo(c.fX, y);
c.fY = y;
}
break;
case 'C':
data = find_points(data, points, 3, relative, &c);
goto cubicCommon;
case 'S':
data = find_points(data, &points[1], 2, relative, &c);
points[0] = c;
if (previousOp == 'C' || previousOp == 'S') {
points[0].fX -= lastc.fX - c.fX;
points[0].fY -= lastc.fY - c.fY;
}
cubicCommon:
// if (data[0] == '\0')
// return;
#if QUADRATIC_APPROXIMATION
quadApprox(fPath, points[0], points[1], points[2]);
#else //this way just does a boring, slow old cubic
fPath.cubicTo(points[0], points[1], points[2]);
#endif
//if we are using the quadApprox, lastc is what it would have been if we had used
//cubicTo
lastc = points[1];
c = points[2];
break;
case 'Q': // Quadratic Bezier Curve
data = find_points(data, points, 2, relative, &c);
goto quadraticCommon;
case 'T':
data = find_points(data, &points[1], 1, relative, &c);
points[0] = points[1];
if (previousOp == 'Q' || previousOp == 'T') {
points[0].fX = c.fX * 2 - lastc.fX;
points[0].fY = c.fY * 2 - lastc.fY;
}
quadraticCommon:
fPath.quadTo(points[0], points[1]);
lastc = points[0];
c = points[1];
break;
case 'Z':
fPath.close();
#if 0 // !!! still a bug?
if (fPath.isEmpty() && (f.fX != 0 || f.fY != 0)) {
c.fX -= SkScalar.Epsilon; // !!! enough?
fPath.moveTo(c);
fPath.lineTo(f);
fPath.close();
}
#endif
c = f;
op = '\0';
break;
case '~': {
SkPoint args[2];
data = find_points(data, args, 2, false, NULL);
fPath.moveTo(args[0].fX, args[0].fY);
fPath.lineTo(args[1].fX, args[1].fY);
}
break;
default:
SkASSERT(0);
return;
}
if (previousOp == 0)
f = c;
previousOp = op;
} while (data[0] > 0);
}
bool SkParsePath::FromSVGString(const char data[], SkPath* result) {
SkPath path;
SkPoint f = {0, 0};
SkPoint c = {0, 0};
SkPoint lastc = {0, 0};
SkPoint points[3];
char op = '\0';
char previousOp = '\0';
bool relative = false;
for (;;) {
data = skip_ws(data);
if (data[0] == '\0') {
break;
}
char ch = data[0];
if (is_digit(ch) || ch == '-' || ch == '+') {
if (op == '\0') {
return false;
}
} else {
op = ch;
relative = false;
if (is_lower(op)) {
op = (char) to_upper(op);
relative = true;
}
data++;
data = skip_sep(data);
}
switch (op) {
case 'M':
data = find_points(data, points, 1, relative, &c);
path.moveTo(points[0]);
op = 'L';
c = points[0];
break;
case 'L':
data = find_points(data, points, 1, relative, &c);
path.lineTo(points[0]);
c = points[0];
break;
case 'H': {
SkScalar x;
data = find_scalar(data, &x, relative, c.fX);
path.lineTo(x, c.fY);
c.fX = x;
} break;
case 'V': {
SkScalar y;
data = find_scalar(data, &y, relative, c.fY);
path.lineTo(c.fX, y);
c.fY = y;
} break;
case 'C':
data = find_points(data, points, 3, relative, &c);
goto cubicCommon;
case 'S':
data = find_points(data, &points[1], 2, relative, &c);
points[0] = c;
if (previousOp == 'C' || previousOp == 'S') {
points[0].fX -= lastc.fX - c.fX;
points[0].fY -= lastc.fY - c.fY;
}
cubicCommon:
path.cubicTo(points[0], points[1], points[2]);
lastc = points[1];
c = points[2];
break;
case 'Q': // Quadratic Bezier Curve
data = find_points(data, points, 2, relative, &c);
goto quadraticCommon;
case 'T':
data = find_points(data, &points[1], 1, relative, &c);
points[0] = points[1];
if (previousOp == 'Q' || previousOp == 'T') {
points[0].fX = c.fX * 2 - lastc.fX;
points[0].fY = c.fY * 2 - lastc.fY;
}
quadraticCommon:
path.quadTo(points[0], points[1]);
lastc = points[0];
c = points[1];
break;
case 'Z':
path.close();
#if 0 // !!! still a bug?
if (fPath.isEmpty() && (f.fX != 0 || f.fY != 0)) {
c.fX -= SkScalar.Epsilon; // !!! enough?
fPath.moveTo(c);
fPath.lineTo(f);
fPath.close();
}
#endif
c = f;
op = '\0';
break;
case '~': {
SkPoint args[2];
data = find_points(data, args, 2, false, NULL);
path.moveTo(args[0].fX, args[0].fY);
path.lineTo(args[1].fX, args[1].fY);
} break;
default:
return false;
}
if (previousOp == 0) {
f = c;
}
previousOp = op;
}
// we're good, go ahead and swap in the result
result->swap(path);
return true;
}
