bool SVGTextQuery::mapStartEndPositionsIntoFragmentCoordinates(Data* queryData, const SVGTextFragment& fragment, int& startPosition, int& endPosition) const
{
// Reuse the same logic used for text selection & painting, to map our query start/length into start/endPositions of the current text fragment.
startPosition -= queryData->processedCharacters;
endPosition -= queryData->processedCharacters;
// <startPosition, endPosition> is now a tuple of offsets relative to the current text box.
// Compute the offsets of the fragment in the same offset space.
int fragmentStartInBox = fragment.characterOffset - queryData->textBox->start();
int fragmentEndInBox = fragmentStartInBox + fragment.length;
// Check if the ranges intersect.
startPosition = std::max(startPosition, fragmentStartInBox);
endPosition = std::min(endPosition, fragmentEndInBox);
if (startPosition >= endPosition)
return false;
modifyStartEndPositionsRespectingLigatures(queryData, fragment, startPosition, endPosition);
if (!queryData->textBox->mapStartEndPositionsIntoFragmentCoordinates(fragment, startPosition, endPosition))
return false;
ASSERT(startPosition < endPosition);
return true;
}
bool SVGTextQuery::mapStartEndPositionsIntoFragmentCoordinates(Data* queryData, const SVGTextFragment& fragment, int& startPosition, int& endPosition) const
{
// Reuse the same logic used for text selection & painting, to map our query start/length into start/endPositions of the current text fragment.
startPosition -= queryData->processedCharacters;
endPosition -= queryData->processedCharacters;
if (startPosition >= endPosition || startPosition < 0 || endPosition < 0)
return false;
modifyStartEndPositionsRespectingLigatures(queryData, startPosition, endPosition);
if (!queryData->textBox->mapStartEndPositionsIntoFragmentCoordinates(fragment, startPosition, endPosition))
return false;
ASSERT(startPosition < endPosition);
return true;
}
static bool mapStartEndPositionsIntoFragmentCoordinates(const QueryData* queryData, const SVGTextFragment& fragment, int& startPosition, int& endPosition)
{
unsigned boxStart = queryData->currentOffset;
// Make <startPosition, endPosition> offsets relative to the current text box.
startPosition -= boxStart;
endPosition -= boxStart;
// Reuse the same logic used for text selection & painting, to map our
// query start/length into start/endPositions of the current text fragment.
if (!queryData->textBox->mapStartEndPositionsIntoFragmentCoordinates(fragment, startPosition, endPosition))
return false;
modifyStartEndPositionsRespectingLigatures(queryData, fragment, startPosition, endPosition);
ASSERT(startPosition < endPosition);
return true;
}
