SkDashPathEffect::SkDashPathEffect(const SkScalar intervals[], int count,
SkScalar phase, bool scaleToFit)
: fScaleToFit(scaleToFit) {
SkASSERT(intervals);
SkASSERT(count > 1 && SkAlign2(count) == count);
fIntervals = (SkScalar*)sk_malloc_throw(sizeof(SkScalar) * count);
fCount = count;
SkScalar len = 0;
for (int i = 0; i < count; i++) {
SkASSERT(intervals[i] >= 0);
fIntervals[i] = intervals[i];
len += intervals[i];
}
fIntervalLength = len;
// watch out for values that might make us go out of bounds
if ((len > 0) && SkScalarIsFinite(phase) && SkScalarIsFinite(len)) {
// Adjust phase to be between 0 and len, "flipping" phase if negative.
// e.g., if len is 100, then phase of -20 (or -120) is equivalent to 80
if (phase < 0) {
phase = -phase;
if (phase > len) {
phase = SkScalarMod(phase, len);
}
phase = len - phase;
// Due to finite precision, it's possible that phase == len,
// even after the subtract (if len >>> phase), so fix that here.
// This fixes http://crbug.com/124652 .
SkASSERT(phase <= len);
if (phase == len) {
phase = 0;
}
} else if (phase >= len) {
phase = SkScalarMod(phase, len);
}
SkASSERT(phase >= 0 && phase < len);
fInitialDashLength = FindFirstInterval(intervals, phase,
&fInitialDashIndex, count);
SkASSERT(fInitialDashLength >= 0);
SkASSERT(fInitialDashIndex >= 0 && fInitialDashIndex < fCount);
} else {
fInitialDashLength = -1; // signal bad dash intervals
}
}
void SkDashPathEffect::setInternalMembers(SkScalar phase) {
SkScalar len = 0;
for (int i = 0; i < fCount; i++) {
len += fIntervals[i];
}
fIntervalLength = len;
// watch out for values that might make us go out of bounds
if ((len > 0) && SkScalarIsFinite(phase) && SkScalarIsFinite(len)) {
// Adjust phase to be between 0 and len, "flipping" phase if negative.
// e.g., if len is 100, then phase of -20 (or -120) is equivalent to 80
if (phase < 0) {
phase = -phase;
if (phase > len) {
phase = SkScalarMod(phase, len);
}
phase = len - phase;
// Due to finite precision, it's possible that phase == len,
// even after the subtract (if len >>> phase), so fix that here.
// This fixes http://crbug.com/124652 .
SkASSERT(phase <= len);
if (phase == len) {
phase = 0;
}
} else if (phase >= len) {
phase = SkScalarMod(phase, len);
}
SkASSERT(phase >= 0 && phase < len);
fPhase = phase;
fInitialDashLength = FindFirstInterval(fIntervals, fPhase,
&fInitialDashIndex, fCount);
SkASSERT(fInitialDashLength >= 0);
SkASSERT(fInitialDashIndex >= 0 && fInitialDashIndex < fCount);
} else {
fInitialDashLength = -1; // signal bad dash intervals
}
}
SkDashPathEffect::SkDashPathEffect(const SkScalar intervals[], int count, SkScalar phase, bool scaleToFit)
: fScaleToFit(scaleToFit)
{
SkASSERT(intervals);
SkASSERT(count > 1 && SkAlign2(count) == count);
fIntervals = (SkScalar*)sk_malloc_throw(sizeof(SkScalar) * count);
fCount = count;
SkScalar len = 0;
for (int i = 0; i < count; i++)
{
SkASSERT(intervals[i] >= 0);
fIntervals[i] = intervals[i];
len += intervals[i];
}
fIntervalLength = len;
if (len > 0) // we don't handle 0 length dash arrays
{
if (phase < 0)
{
phase = -phase;
if (phase > len)
phase = SkScalarMod(phase, len);
phase = len - phase;
}
else if (phase >= len)
phase = SkScalarMod(phase, len);
SkASSERT(phase >= 0 && phase < len);
fInitialDashLength = FindFirstInterval(intervals, phase, &fInitialDashIndex);
SkASSERT(fInitialDashLength >= 0);
SkASSERT(fInitialDashIndex >= 0 && fInitialDashIndex < fCount);
}
else
fInitialDashLength = -1; // signal bad dash intervals
}
