bool
TopographyFile::Update(const WindowProjection &map_projection)
{
if (IsEmpty())
return false;
if (map_projection.GetMapScale() > scale_threshold)
/* not visible, don't update cache now */
return false;
const GeoBounds screenRect =
map_projection.GetScreenBounds();
if (cache_bounds.IsValid() && cache_bounds.IsInside(screenRect))
/* the cache is still fresh */
return false;
cache_bounds = map_projection.GetScreenBounds().Scale(fixed(2));
rectObj deg_bounds = ConvertRect(cache_bounds);
// Test which shapes are inside the given bounds and save the
// status to file.status
msShapefileWhichShapes(&file, dir, deg_bounds, 0);
// If not a single shape is inside the bounds
if (!file.status) {
// ... clear the whole buffer
ClearCache();
return false;
}
// Iterate through the shapefile entries
const ShapeList **current = &first;
auto it = shapes.begin();
for (int i = 0; i < file.numshapes; ++i, ++it) {
if (!msGetBit(file.status, i)) {
// If the shape is outside the bounds
// delete the shape from the cache
delete it->shape;
it->shape = NULL;
} else {
// is inside the bounds
if (it->shape == NULL)
// shape isn't cached yet -> cache the shape
it->shape = new XShape(&file, i, label_field);
// update list pointer
*current = it;
current = &it->next;
}
}
// end of list marker
*current = NULL;
++serial;
return true;
}
bool
TopographyFile::Update(const WindowProjection &map_projection)
{
if (IsEmpty())
return false;
if (map_projection.GetMapScale() > scale_threshold)
/* not visible, don't update cache now */
return false;
const GeoBounds screenRect =
map_projection.GetScreenBounds();
if (cache_bounds.IsValid() && cache_bounds.IsInside(screenRect))
/* the cache is still fresh */
return false;
cache_bounds = screenRect.Scale(2);
rectObj deg_bounds = ConvertRect(cache_bounds);
// Test which shapes are inside the given bounds and save the
// status to file.status
switch (msShapefileWhichShapes(&file, dir, deg_bounds, 0)) {
case MS_FAILURE:
ClearCache();
return false;
case MS_DONE:
/* screen is outside of map bounds */
return false;
case MS_SUCCESS:
break;
}
assert(file.status != nullptr);
// Iterate through the shapefile entries
const ShapeList **current = &first;
auto it = shapes.begin();
for (int i = 0; i < file.numshapes; ++i, ++it) {
if (!msGetBit(file.status, i)) {
// If the shape is outside the bounds
// delete the shape from the cache
if (it->shape != nullptr) {
assert(*current == it);
/* remove from linked list (protected) */
{
const ScopeLock lock(mutex);
*current = it->next;
++serial;
}
/* now it's unreachable, and we can delete the XShape without
holding a lock */
delete it->shape;
it->shape = nullptr;
}
} else {
// is inside the bounds
if (it->shape == nullptr) {
assert(*current != it);
// shape isn't cached yet -> cache the shape
it->shape = LoadShape(&file, center, i, label_field);
it->next = *current;
/* insert into linked list (protected) */
{
const ScopeLock lock(mutex);
*current = it;
++serial;
}
}
current = &it->next;
}
}
// end of list marker
assert(*current == nullptr);
return true;
}
bool
TopographyFile::Update(const WindowProjection &map_projection)
{
if (IsEmpty())
return false;
if (map_projection.GetMapScale() > scale_threshold)
/* not visible, don't update cache now */
return false;
const GeoBounds screenRect =
map_projection.GetScreenBounds();
if (cache_bounds.inside(screenRect))
/* the cache is still fresh */
return false;
cache_bounds = map_projection.GetScreenBounds().scale(fixed_two);
rectObj deg_bounds = ConvertRect(cache_bounds);
// Test which shapes are inside the given bounds and save the
// status to file.status
msShapefileWhichShapes(&file, dir, deg_bounds, 0);
// If not a single shape is inside the bounds
if (!file.status) {
// ... clear the whole buffer
ClearCache();
return false;
}
// Iterate through the shapefile entries
for (int i = 0; i < file.numshapes; i++) {
if (!msGetBit(file.status, i)) {
// If the shape is outside the bounds
// delete the shape from the cache
delete shapes[i].shape;
shapes[i].shape = NULL;
} else if (shapes[i].shape == NULL) {
// If the shape is inside the bounds and if the
// shape isn't cached yet -> cache the shape
shapes[i].shape = new XShape(&file, i, label_field);
}
}
ShapeList::NotNull not_null;
XShapePointerArray::iterator end = shapes.end(), it = shapes.begin();
it = std::find_if(it, end, not_null);
if (it != shapes.end()) {
ShapeList *current = &*it;
first = current;
while (true) {
++it;
it = std::find_if(it, end, not_null);
if (it == end) {
current->next = NULL;
break;
}
ShapeList *next = &*it;
current->next = next;
current = next;
}
} else
first = NULL;
return true;
}
