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Fixed GetBackgroundDrawList()/GetForegroundDrawList() not being properly reset every frame when cumulated session time is very large. (#9521)

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Using a FrameCount for compare. Kept time as float to be consistent with other GC-related timestamps: if there is an actual need to use double we'll switch everywhere.
This commit is contained in:
ocornut
2026-08-23 13:05:33 +02:00
parent 1d7b37dc9b
commit 0af8f475d1
3 changed files with 10 additions and 5 deletions
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7
imgui.cpp
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@@ -5305,12 +5305,13 @@ static ImDrawList* GetViewportBgFgDrawList(ImGuiViewportP* viewport, size_t draw
}
// Our ImDrawList system requires that there is always a command
if (viewport->BgFgDrawListsLastTimeActive[drawlist_no] != (float)g.Time)
if (viewport->BgFgDrawListsLastFrameActive[drawlist_no] != g.FrameCount)
{
draw_list->_ResetForNewFrame();
draw_list->_SetPixelDensity(viewport->FramebufferScale.x);
draw_list->PushTexture(g.IO.Fonts->TexRef);
draw_list->PushClipRect(viewport->Pos, viewport->Pos + viewport->Size, false);
viewport->BgFgDrawListsLastFrameActive[drawlist_no] = g.FrameCount;
viewport->BgFgDrawListsLastTimeActive[drawlist_no] = (float)g.Time;
}
return draw_list;
@@ -6212,7 +6213,7 @@ void ImGui::Render()
for (ImGuiViewportP* viewport : g.Viewports)
{
InitViewportDrawData(viewport);
if (viewport->BgFgDrawLists[0] != NULL && viewport->BgFgDrawListsLastTimeActive[0] == (float)g.Time)
if (viewport->BgFgDrawLists[0] != NULL && viewport->BgFgDrawListsLastFrameActive[0] == g.FrameCount)
AddDrawListToDrawDataEx(&viewport->DrawDataP, viewport->DrawDataBuilder.Layers[0], GetBackgroundDrawList(viewport));
}
@@ -6244,7 +6245,7 @@ void ImGui::Render()
FlattenDrawDataIntoSingleLayer(&viewport->DrawDataBuilder);
// Add foreground ImDrawList (for each active viewport)
if (viewport->BgFgDrawLists[1] != NULL && viewport->BgFgDrawListsLastTimeActive[1] == (float)g.Time)
if (viewport->BgFgDrawLists[1] != NULL && viewport->BgFgDrawListsLastFrameActive[1] == g.FrameCount)
AddDrawListToDrawDataEx(&viewport->DrawDataP, viewport->DrawDataBuilder.Layers[0], GetForegroundDrawList(viewport));
// We call _PopUnusedDrawCmd() last thing, as RenderDimmedBackgrounds() rely on a valid command being there (especially in docking branch).