KoFilterEffectStack * FilterEffectResource::toFilterStack() const
{
KoFilterEffectStack * filterStack = new KoFilterEffectStack();
if (!filterStack)
return 0;
QByteArray data = m_data.toByteArray();
KoXmlDocument doc;
doc.setContent(data);
KoXmlElement e = doc.documentElement();
// only allow obect bounding box units
if (e.hasAttribute("filterUnits") && e.attribute("filterUnits") != "objectBoundingBox")
return 0;
if (e.attribute("primitiveUnits") != "objectBoundingBox")
return 0;
// parse filter region rectangle
QRectF filterRegion;
filterRegion.setX(fromPercentage(e.attribute("x", "-0.1")));
filterRegion.setY(fromPercentage(e.attribute("y", "-0.1")));
filterRegion.setWidth(fromPercentage(e.attribute("width", "1.2")));
filterRegion.setHeight(fromPercentage(e.attribute("height", "1.2")));
filterStack->setClipRect(filterRegion);
KoFilterEffectLoadingContext context(QString(""));
KoFilterEffectRegistry * registry = KoFilterEffectRegistry::instance();
// create the filter effects and add them to the shape
for (KoXmlNode n = e.firstChild(); !n.isNull(); n = n.nextSibling()) {
KoXmlElement primitive = n.toElement();
KoFilterEffect * filterEffect = registry->createFilterEffectFromXml(primitive, context);
if (!filterEffect) {
qWarning() << "filter effect" << primitive.tagName() << "is not implemented yet";
continue;
}
// parse subregion
qreal x = fromPercentage(primitive.attribute("x", "0"));
qreal y = fromPercentage(primitive.attribute("y", "0"));
qreal w = fromPercentage(primitive.attribute("width", "1"));
qreal h = fromPercentage(primitive.attribute("height", "1"));
QRectF subRegion(QPointF(x, y), QSizeF(w, h));
if (primitive.hasAttribute("in"))
filterEffect->setInput(0, primitive.attribute("in"));
if (primitive.hasAttribute("result"))
filterEffect->setOutput(primitive.attribute("result"));
filterEffect->setFilterRect(subRegion);
filterStack->appendFilterEffect(filterEffect);
}
return filterStack;
}
void SvgParser::applyFilter(KoShape *shape)
{
SvgGraphicsContext *gc = m_context.currentGC();
if (! gc)
return;
if (gc->filterId.isEmpty())
return;
SvgFilterHelper *filter = findFilter(gc->filterId);
if (! filter)
return;
KoXmlElement content = filter->content();
// parse filter region
QRectF bound(shape->position(), shape->size());
// work on bounding box without viewbox tranformation applied
// so user space coordinates of bounding box and filter region match up
bound = gc->viewboxTransform.inverted().mapRect(bound);
QRectF filterRegion(filter->position(bound), filter->size(bound));
// convert filter region to boundingbox units
QRectF objectFilterRegion;
objectFilterRegion.setTopLeft(SvgUtil::userSpaceToObject(filterRegion.topLeft(), bound));
objectFilterRegion.setSize(SvgUtil::userSpaceToObject(filterRegion.size(), bound));
KoFilterEffectLoadingContext context(m_context.xmlBaseDir());
context.setShapeBoundingBox(bound);
// enable units conversion
context.enableFilterUnitsConversion(filter->filterUnits() == SvgFilterHelper::UserSpaceOnUse);
context.enableFilterPrimitiveUnitsConversion(filter->primitiveUnits() == SvgFilterHelper::UserSpaceOnUse);
KoFilterEffectRegistry *registry = KoFilterEffectRegistry::instance();
KoFilterEffectStack *filterStack = 0;
QSet<QString> stdInputs;
stdInputs << "SourceGraphic" << "SourceAlpha";
stdInputs << "BackgroundImage" << "BackgroundAlpha";
stdInputs << "FillPaint" << "StrokePaint";
QMap<QString, KoFilterEffect*> inputs;
// create the filter effects and add them to the shape
for (KoXmlNode n = content.firstChild(); !n.isNull(); n = n.nextSibling()) {
KoXmlElement primitive = n.toElement();
KoFilterEffect *filterEffect = registry->createFilterEffectFromXml(primitive, context);
if (!filterEffect) {
debugFlake << "filter effect" << primitive.tagName() << "is not implemented yet";
continue;
}
const QString input = primitive.attribute("in");
if (!input.isEmpty()) {
filterEffect->setInput(0, input);
}
const QString output = primitive.attribute("result");
if (!output.isEmpty()) {
filterEffect->setOutput(output);
}
QRectF subRegion;
// parse subregion
if (filter->primitiveUnits() == SvgFilterHelper::UserSpaceOnUse) {
const QString xa = primitive.attribute("x");
const QString ya = primitive.attribute("y");
const QString wa = primitive.attribute("width");
const QString ha = primitive.attribute("height");
if (xa.isEmpty() || ya.isEmpty() || wa.isEmpty() || ha.isEmpty()) {
bool hasStdInput = false;
bool isFirstEffect = filterStack == 0;
// check if one of the inputs is a standard input
foreach(const QString &input, filterEffect->inputs()) {
if ((isFirstEffect && input.isEmpty()) || stdInputs.contains(input)) {
hasStdInput = true;
break;
}
}
if (hasStdInput || primitive.tagName() == "feImage") {
// default to 0%, 0%, 100%, 100%
subRegion.setTopLeft(QPointF(0, 0));
subRegion.setSize(QSizeF(1, 1));
} else {
// defaults to bounding rect of all referenced nodes
foreach(const QString &input, filterEffect->inputs()) {
if (!inputs.contains(input))
continue;
KoFilterEffect *inputFilter = inputs[input];
if (inputFilter)
subRegion |= inputFilter->filterRect();
}
}
} else {
const qreal x = parseUnitX(xa);
const qreal y = parseUnitY(ya);
const qreal w = parseUnitX(wa);
const qreal h = parseUnitY(ha);
subRegion.setTopLeft(SvgUtil::userSpaceToObject(QPointF(x, y), bound));
subRegion.setSize(SvgUtil::userSpaceToObject(QSizeF(w, h), bound));
}
} else {
