static void extendMapRect(QRect &mapBoundingRect, const MapRenderer &renderer)
{
// Start with the basic map size
QRectF rect(mapBoundingRect);
// Take into account large tiles extending beyond their cell
for (const Layer *layer : renderer.map()->tileLayers()) {
const TileLayer *tileLayer = static_cast<const TileLayer*>(layer);
const QPointF offset = tileLayer->totalOffset();
for (int y = 0; y < tileLayer->height(); ++y) {
for (int x = 0; x < tileLayer->width(); ++x) {
const Cell &cell = tileLayer->cellAt(x, y);
if (!cell.isEmpty()) {
QRectF r = cellRect(renderer, cell, QPointF(x, y));
r.translate(offset);
rect |= r;
}
}
}
}
mapBoundingRect = rect.toAlignedRect();
}
static QRectF cellRect(const MapRenderer &renderer,
const Cell &cell,
const QPointF &tileCoords)
{
const Tile *tile = cell.tile();
if (!tile)
return QRectF();
QPointF pixelCoords = renderer.tileToScreenCoords(tileCoords);
QPointF offset = tile->offset();
QSize size = tile->size();
if (cell.flippedAntiDiagonally())
std::swap(size.rwidth(), size.rheight());
// This is a correction needed because tileToScreenCoords does not return
// the bottom-left origin of the tile image, but rather the top-left
// corner of the cell.
pixelCoords.ry() += renderer.map()->tileHeight() - size.height();
return QRectF(pixelCoords, size).translated(offset);
}