SkScalar SkPath1DPathEffect::next(SkPath* dst, SkScalar distance,
SkPathMeasure& meas) const {
switch (fStyle) {
case kTranslate_Style: {
SkPoint pos;
if (meas.getPosTan(distance, &pos, nullptr)) {
dst->addPath(fPath, pos.fX, pos.fY);
}
}
break;
case kRotate_Style: {
SkMatrix matrix;
if (meas.getMatrix(distance, &matrix)) {
dst->addPath(fPath, matrix);
}
}
break;
case kMorph_Style:
morphpath(dst, fPath, meas, distance);
break;
default:
SkDEBUGFAIL("unknown Style enum");
break;
}
return fAdvance;
}
void SkBaseDevice::drawTextOnPath(const SkDraw& draw, const void* text, size_t byteLength,
const SkPath& follow, const SkMatrix* matrix,
const SkPaint& paint) {
SkASSERT(byteLength == 0 || text != nullptr);
// nothing to draw
if (text == nullptr || byteLength == 0 || draw.fRC->isEmpty()) {
return;
}
SkTextToPathIter iter((const char*)text, byteLength, paint, true);
SkPathMeasure meas(follow, false);
SkScalar hOffset = 0;
// need to measure first
if (paint.getTextAlign() != SkPaint::kLeft_Align) {
SkScalar pathLen = meas.getLength();
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
pathLen = SkScalarHalf(pathLen);
}
hOffset += pathLen;
}
const SkPath* iterPath;
SkScalar xpos;
SkMatrix scaledMatrix;
SkScalar scale = iter.getPathScale();
scaledMatrix.setScale(scale, scale);
while (iter.next(&iterPath, &xpos)) {
if (iterPath) {
SkPath tmp;
SkMatrix m(scaledMatrix);
tmp.setIsVolatile(true);
m.postTranslate(xpos + hOffset, 0);
if (matrix) {
m.postConcat(*matrix);
}
morphpath(&tmp, *iterPath, meas, m);
this->drawPath(draw, tmp, iter.getPaint(), nullptr, true);
}
}
}
void TextArt::EnvelopeWarp::morph(SkPath& bSkeleton, SkPathMeasure& bMeasure, SkPathCrossing& bCrossing,
SkPath& tSkeleton, SkPathMeasure& tMeasure, SkPathCrossing& tCrossing,
SkPath& glypthPath, SkPathMeasure& lineMeasure, SkMatrix& scaleMatrix,
SkScalar xpos, SkScalar hBOffset, SkScalar hTOffset, SkPath& warpedPath)
{
SkRect glypthBound;
glypthBound = glypthPath.getBounds();
SkScalar k1 = 1.0;
if (!isSymmetric_)
{
SkScalar hBOffsetTmp = 0.0;
SkScalar hTOffsetTmp = 0.0;
if (isTopBased_)
{
glypthBound.fTop = 0;
glypthBound.fBottom = -boundsRect_.height();
SkMatrix compositeTMatrix(scaleMatrix);
compositeTMatrix.postTranslate(xpos + hTOffset, 0);
compositeTMatrix.postConcat(matrix_);
if ( getK(glypthBound, bCrossing, tCrossing, tMeasure, compositeTMatrix, k1, hBOffsetTmp, hTOffsetTmp) )
{
k1 = 1/k1;
hBOffset = hBOffsetTmp;
hTOffset = xpos + hTOffset;
}
}
else
{
glypthBound.fTop = -boundsRect_.height();
glypthBound.fBottom = 0;
SkMatrix compositeBMatrix(scaleMatrix);
compositeBMatrix.postTranslate(xpos + hBOffset, 0);
compositeBMatrix.postConcat(matrix_);
if ( getK(glypthBound, bCrossing, tCrossing, bMeasure, compositeBMatrix, k1, hBOffsetTmp, hTOffsetTmp) )
{
//use distance to Left on Top Skeleton for positioning Top glypthn
hTOffset = hTOffsetTmp;
hBOffset = xpos + hBOffset;
}
}
}
else
{
hBOffset = xpos + hBOffset;
hTOffset = hBOffset;
}
SkMatrix compositeBMatrix(scaleMatrix);
compositeBMatrix.postTranslate(hBOffset, 0);
compositeBMatrix.postConcat(matrix_);
//warp Glypth by bottom line
k1_ = isTopBased_ ? k1 : SkIntToScalar(1);
isTop = false;
SkPath bWarped;
morphpath(&bWarped, glypthPath, bMeasure, compositeBMatrix);
bWarped_.addPath(bWarped);
if (!tSkeleton_.isEmpty())
{
SkMatrix compositeTMatrix(scaleMatrix);
compositeTMatrix.postTranslate(hTOffset, 0);
compositeTMatrix.postConcat(matrix_);
//warp Glypth by top line
k1_ = !isTopBased_ ? k1 : SkIntToScalar(1);
isTop = true;
SkPath tWarped;
morphpath(&tWarped, glypthPath, tMeasure, compositeTMatrix);
tWarped_.addPath(tWarped);
//convert Glypth to Path to allow weighting
SkPath lineMorphed;
morphpath(&lineMorphed, glypthPath, lineMeasure, scaleMatrix);
weight(lineMorphed, tWarped, bWarped, &warpedPath);
}
else
warpedPath.addPath(bWarped_);
}