bool SvgParser::parseGradient(const KoXmlElement &e, const KoXmlElement &referencedBy)
{
// IMPROVEMENTS:
// - Store the parsed colorstops in some sort of a cache so they don't need to be parsed again.
// - A gradient inherits attributes it does not have from the referencing gradient.
// - Gradients with no color stops have no fill or stroke.
// - Gradients with one color stop have a solid color.
SvgGraphicsContext *gc = m_context.currentGC();
if (!gc)
return false;
SvgGradientHelper gradhelper;
if (e.hasAttribute("xlink:href")) {
QString href = e.attribute("xlink:href").mid(1);
if (! href.isEmpty()) {
// copy the referenced gradient if found
SvgGradientHelper *pGrad = findGradient(href);
if (pGrad)
gradhelper = *pGrad;
} else {
//gc->fillType = SvgGraphicsContext::None; // <--- TODO Fill OR Stroke are none
return false;
}
}
// Use the gradient that is referencing, or if there isn't one, the original gradient.
KoXmlElement b;
if (!referencedBy.isNull())
b = referencedBy;
else
b = e;
QString gradientId = b.attribute("id");
if (! gradientId.isEmpty()) {
// check if we have this gradient already parsed
// copy existing gradient if it exists
if (m_gradients.find(gradientId) != m_gradients.end())
gradhelper.copyGradient(m_gradients[ gradientId ].gradient());
}
if (b.attribute("gradientUnits") == "userSpaceOnUse")
gradhelper.setGradientUnits(SvgGradientHelper::UserSpaceOnUse);
// parse color prop
QColor c = gc->currentColor;
if (!b.attribute("color").isEmpty()) {
m_context.styleParser().parseColor(c, b.attribute("color"));
} else {
// try style attr
QString style = b.attribute("style").simplified();
const QStringList substyles = style.split(';', QString::SkipEmptyParts);
for (QStringList::ConstIterator it = substyles.begin(); it != substyles.end(); ++it) {
QStringList substyle = it->split(':');
QString command = substyle[0].trimmed();
QString params = substyle[1].trimmed();
if (command == "color")
m_context.styleParser().parseColor(c, params);
}
}
gc->currentColor = c;
if (b.tagName() == "linearGradient") {
QLinearGradient *g = new QLinearGradient();
if (gradhelper.gradientUnits() == SvgGradientHelper::ObjectBoundingBox) {
g->setCoordinateMode(QGradient::ObjectBoundingMode);
g->setStart(QPointF(SvgUtil::fromPercentage(b.attribute("x1", "0%")),
SvgUtil::fromPercentage(b.attribute("y1", "0%"))));
g->setFinalStop(QPointF(SvgUtil::fromPercentage(b.attribute("x2", "100%")),
SvgUtil::fromPercentage(b.attribute("y2", "0%"))));
} else {
g->setStart(QPointF(SvgUtil::fromUserSpace(b.attribute("x1").toDouble()),
SvgUtil::fromUserSpace(b.attribute("y1").toDouble())));
g->setFinalStop(QPointF(SvgUtil::fromUserSpace(b.attribute("x2").toDouble()),
SvgUtil::fromUserSpace(b.attribute("y2").toDouble())));
}
// preserve color stops
if (gradhelper.gradient())
g->setStops(gradhelper.gradient()->stops());
gradhelper.setGradient(g);
} else if (b.tagName() == "radialGradient") {
QRadialGradient *g = new QRadialGradient();
if (gradhelper.gradientUnits() == SvgGradientHelper::ObjectBoundingBox) {
g->setCoordinateMode(QGradient::ObjectBoundingMode);
g->setCenter(QPointF(SvgUtil::fromPercentage(b.attribute("cx", "50%")),
SvgUtil::fromPercentage(b.attribute("cy", "50%"))));
g->setRadius(SvgUtil::fromPercentage(b.attribute("r", "50%")));
g->setFocalPoint(QPointF(SvgUtil::fromPercentage(b.attribute("fx", "50%")),
SvgUtil::fromPercentage(b.attribute("fy", "50%"))));
} else {
g->setCenter(QPointF(SvgUtil::fromUserSpace(b.attribute("cx").toDouble()),
SvgUtil::fromUserSpace(b.attribute("cy").toDouble())));
g->setFocalPoint(QPointF(SvgUtil::fromUserSpace(b.attribute("fx").toDouble()),
SvgUtil::fromUserSpace(b.attribute("fy").toDouble())));
g->setRadius(SvgUtil::fromUserSpace(b.attribute("r").toDouble()));
}
// preserve color stops
if (gradhelper.gradient())
g->setStops(gradhelper.gradient()->stops());
gradhelper.setGradient(g);
} else {
return false;
}
// handle spread method
QString spreadMethod = b.attribute("spreadMethod");
if (!spreadMethod.isEmpty()) {
if (spreadMethod == "reflect")
gradhelper.gradient()->setSpread(QGradient::ReflectSpread);
else if (spreadMethod == "repeat")
gradhelper.gradient()->setSpread(QGradient::RepeatSpread);
else
gradhelper.gradient()->setSpread(QGradient::PadSpread);
} else
gradhelper.gradient()->setSpread(QGradient::PadSpread);
// Parse the color stops. The referencing gradient does not have colorstops,
// so use the stops from the gradient it references to (e in this case and not b)
m_context.styleParser().parseColorStops(gradhelper.gradient(), e);
gradhelper.setTransform(SvgUtil::parseTransform(b.attribute("gradientTransform")));
m_gradients.insert(gradientId, gradhelper);
return true;
}
