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MultiSelect: ImGuiSelectionBasicStorage: optimized for smaller insertion amounts in larger sets + fix caling batch select with same value.

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ocornut 2024-07-01 19:54:35 +02:00
parent 1b63522446
commit 7814518049
3 changed files with 32 additions and 13 deletions
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2
imgui.cpp
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@ -2558,6 +2558,7 @@ ImGuiStoragePair* ImLowerBound(ImGuiStoragePair* in_begin, ImGuiStoragePair* in_
return in_p;
}
IM_MSVC_RUNTIME_CHECKS_OFF
static int IMGUI_CDECL PairComparerByID(const void* lhs, const void* rhs)
{
// We can't just do a subtraction because qsort uses signed integers and subtracting our ID doesn't play well with that.
@ -2567,7 +2568,6 @@ static int IMGUI_CDECL PairComparerByID(const void* lhs, const void* rhs)
}
// For quicker full rebuild of a storage (instead of an incremental one), you may add all your contents and then sort once.
IM_MSVC_RUNTIME_CHECKS_OFF
void ImGuiStorage::BuildSortByKey()
{
ImQsort(Data.Data, (size_t)Data.Size, sizeof(ImGuiStoragePair), PairComparerByID);

4
imgui.h
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@ -2771,8 +2771,8 @@ enum ImGuiMultiSelectFlags_
ImGuiMultiSelectFlags_NoAutoSelect = 1 << 3, // Disable selecting items when navigating (useful for e.g. supporting range-select in a list of checkboxes)
ImGuiMultiSelectFlags_NoAutoClear = 1 << 4, // Disable clearing selection when navigating or selecting another one (generally used with ImGuiMultiSelectFlags_NoAutoSelect. useful for e.g. supporting range-select in a list of checkboxes)
ImGuiMultiSelectFlags_NoAutoClearOnReselect = 1 << 5, // Disable clearing selection when clicking/selecting an already selected item
ImGuiMultiSelectFlags_BoxSelect1d = 1 << 6, // Enable box-selection with same width and same x pos items (e.g. only full row Selectable()). Small optimization.
ImGuiMultiSelectFlags_BoxSelect2d = 1 << 7, // Enable box-selection with varying width or varying x pos items support (e.g. different width labels, or 2D layout/grid). This alters clipping logic so that e.g. horizontal movements will update selection of normally clipped items. Box-selection works better with little bit of spacing between items hit-box in order to be able to aim at empty space.
ImGuiMultiSelectFlags_BoxSelect1d = 1 << 6, // Enable box-selection with same width and same x pos items (e.g. only full row Selectable()). Box-selection works better with little bit of spacing between items hit-box in order to be able to aim at empty space.
ImGuiMultiSelectFlags_BoxSelect2d = 1 << 7, // Enable box-selection with varying width or varying x pos items support (e.g. different width labels, or 2D layout/grid). This is slower: alters clipping logic so that e.g. horizontal movements will update selection of normally clipped items.
ImGuiMultiSelectFlags_BoxSelectNoScroll = 1 << 8, // Disable scrolling when box-selecting near edges of scope.
ImGuiMultiSelectFlags_ClearOnEscape = 1 << 9, // Clear selection when pressing Escape while scope is focused.
ImGuiMultiSelectFlags_ClearOnClickVoid = 1 << 10, // Clear selection when clicking on empty location within scope.

29
imgui_widgets.cpp
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@ -7905,7 +7905,7 @@ static void ImGuiSelectionBasicStorage_BatchSetItemSelected(ImGuiSelectionBasicS
ImGuiStorage* storage = &selection->_Storage;
ImGuiStoragePair* it = ImLowerBound(storage->Data.Data, storage->Data.Data + size_before_amends, id);
const bool is_contained = (it != storage->Data.Data + size_before_amends) && (it->key == id);
if (selected == is_contained && it->val_i != 0)
if (selected == (is_contained && it->val_i != 0))
return;
if (selected && !is_contained)
storage->Data.push_back(ImGuiStoragePair(id, selection_order)); // Push unsorted at end of vector, will be sorted in SelectionMultiAmendsFinish()
@ -7945,10 +7945,15 @@ void ImGuiSelectionBasicStorage::ApplyRequests(ImGuiMultiSelectIO* ms_io)
IM_ASSERT(ms_io->ItemsCount != -1 && "Missing value for items_count in BeginMultiSelect() call!");
IM_ASSERT(AdapterIndexToStorageId != NULL);
// This is optimized/specialized to cope nicely with very large selections (e.g. 1 million items)
// This is optimized/specialized to cope with very large selections (e.g. 100k+ items)
// - A simpler version could call SetItemSelected() directly instead of ImGuiSelectionBasicStorage_BatchSetItemSelected() + ImGuiSelectionBasicStorage_BatchFinish().
// - Optimized select can append unsorted, then sort in a second pass. Optimized unselect can clear in-place then compact in a second pass.
// - (A more optimal version wouldn't even use ImGuiStorage but directly a ImVector<ImGuiID> to reduce bandwidth, but this is a reasonable trade off to reuse code)
// - A more optimal version wouldn't even use ImGuiStorage but directly a ImVector<ImGuiID> to reduce bandwidth, but this is a reasonable trade off to reuse code.
// - There are many ways this could be better optimized. The worse case scenario being: using BoxSelect2d in a grid, box-select scrolling down while wiggling
// left and right: it affects coarse clipping + can emit multiple SetRange with 1 item each.)
// FIXME-OPT: For each block of consecutive SetRange request:
// - add all requests to a sorted list, store ID, selected, offset in ImGuiStorage.
// - rewrite sorted storage a single time.
for (ImGuiSelectionRequest& req : ms_io->Requests)
{
if (req.Type == ImGuiSelectionRequestType_SetAll)
@ -7965,15 +7970,29 @@ void ImGuiSelectionBasicStorage::ApplyRequests(ImGuiMultiSelectIO* ms_io)
}
else if (req.Type == ImGuiSelectionRequestType_SetRange)
{
const int selection_changes = (int)req.RangeLastItem - (int)req.RangeFirstItem + 1;
//ImGuiContext& g = *GImGui; IMGUI_DEBUG_LOG_SELECTION("Req %d/%d: set %d to %d\n", ms_io->Requests.index_from_ptr(&req), ms_io->Requests.Size, selection_changes, req.Selected);
if (selection_changes == 1 || (selection_changes < Size / 100))
{
// Multiple sorted insertion + copy likely to be faster.
// Technically we could do a single copy with a little more work (sort sequential SetRange requests)
for (int idx = (int)req.RangeFirstItem; idx <= (int)req.RangeLastItem; idx++)
SetItemSelected(GetStorageIdFromIndex(idx), req.Selected);
}
else
{
// Append insertion + single sort likely be faster.
// Use req.RangeDirection to set order field so that shift+clicking from 1 to 5 is different than shift+clicking from 5 to 1
const int size_before_amends = _Storage.Data.Size;
int selection_order = _SelectionOrder + ((req.RangeDirection < 0) ? (int)req.RangeLastItem - (int)req.RangeFirstItem : 0);
int selection_order = _SelectionOrder + ((req.RangeDirection < 0) ? selection_changes - 1 : 0);
for (int idx = (int)req.RangeFirstItem; idx <= (int)req.RangeLastItem; idx++, selection_order += req.RangeDirection)
ImGuiSelectionBasicStorage_BatchSetItemSelected(this, GetStorageIdFromIndex(idx), req.Selected, size_before_amends, selection_order);
_SelectionOrder += (int)req.RangeLastItem - (int)req.RangeFirstItem + 1;
if (req.Selected)
_SelectionOrder += selection_changes;
ImGuiSelectionBasicStorage_BatchFinish(this, req.Selected, size_before_amends);
}
}
}
}
//-------------------------------------------------------------------------