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Discard/GC of ImDrawList buffers for unused windows favor restoring them to ~Size*1.05 instead of Capacity when awakening again. (#9303)

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+ made "GC now" button process even active windows.
This commit is contained in:
ocornut
2026-03-18 15:34:12 +01:00
parent 994ca12b29
commit 709be8c495
2 changed files with 10 additions and 4 deletions
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4
docs/CHANGELOG.txt
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@@ -120,6 +120,10 @@ Other Changes:
as a convenience for when using e.g. InvisibleButton().
- Focus: fixed fallback "Debug" window temporarily taking focus and setting io.WantCaptureKeyboard
for one frame on e.g. application boot if no other windows are submitted. (#9243)
- Memory:
- Discard/GC of ImDrawList buffers for unused windows favor restoring them to
~Size*1.05 instead of Capacity when awakening again. Facilitate releasing ImDrawList
buffers after unusual usage spike. (#9303).
- Demo: fixed IMGUI_DEMO_MARKER locations for examples applets. (#9261, #3689) [@pthom]
- Backends:
- SDLGPU3: removed unnecessary call to SDL_WaitForGPUIdle when releasing

10
imgui.cpp
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@@ -4633,11 +4633,12 @@ void ImGui::GcCompactTransientMiscBuffers()
// Not freed:
// - ImGuiWindow, ImGuiWindowSettings, Name, StateStorage, ColumnsStorage (may hold useful data)
// This should have no noticeable visual effect. When the window reappear however, expect new allocation/buffer growth/copy cost.
// FIXME: Consider exposing of elaborating GC policy, e.g. being able to trim excessive ImDrawList gaps. (#9303)
void ImGui::GcCompactTransientWindowBuffers(ImGuiWindow* window)
{
window->MemoryCompacted = true;
window->MemoryDrawListIdxCapacity = window->DrawList->IdxBuffer.Capacity;
window->MemoryDrawListVtxCapacity = window->DrawList->VtxBuffer.Capacity;
window->MemoryDrawListIdxCapacity = ImMin((int)(window->DrawList->IdxBuffer.Size * 1.05f), window->DrawList->IdxBuffer.Capacity);
window->MemoryDrawListVtxCapacity = ImMin((int)(window->DrawList->VtxBuffer.Size * 1.05f), window->DrawList->VtxBuffer.Capacity);
window->IDStack.clear();
window->DrawList->_ClearFreeMemory();
window->DC.ChildWindows.clear();
@@ -5665,7 +5666,8 @@ void ImGui::NewFrame()
// Mark all windows as not visible and compact unused memory.
IM_ASSERT(g.WindowsFocusOrder.Size <= g.Windows.Size);
const float memory_compact_start_time = (g.GcCompactAll || g.IO.ConfigMemoryCompactTimer < 0.0f) ? FLT_MAX : (float)g.Time - g.IO.ConfigMemoryCompactTimer;
const bool gc_all = (g.GcCompactAll || g.IO.ConfigMemoryCompactTimer < 0.0f);
const float memory_compact_start_time = gc_all ? FLT_MAX : (float)g.Time - g.IO.ConfigMemoryCompactTimer;
for (ImGuiWindow* window : g.Windows)
{
window->WasActive = window->Active;
@@ -5675,7 +5677,7 @@ void ImGui::NewFrame()
window->BeginCount = 0;
// Garbage collect transient buffers of recently unused windows
if (!window->WasActive && !window->MemoryCompacted && window->LastTimeActive < memory_compact_start_time)
if ((!window->WasActive || gc_all) && !window->MemoryCompacted && window->LastTimeActive < memory_compact_start_time)
GcCompactTransientWindowBuffers(window);
}