Viewports: Report minimized viewports as zero DisplaySize to be consistent with main branch + comments (#1542)
diff --git a/imgui.cpp b/imgui.cpp
index bec6741..f580bc2 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -4363,6 +4363,13 @@
static void SetupViewportDrawData(ImGuiViewportP* viewport, ImVector<ImDrawList*>* draw_lists)
{
+ // When minimized, we report draw_data->DisplaySize as zero to be consistent with non-viewport mode,
+ // and to allow applications/back-ends to easily skip rendering.
+ // FIXME: Note that we however do NOT attempt to report "zero drawlist / vertices" into the ImDrawData structure.
+ // This is because the work has been done already, and its wasted! We should fix that and add optimizations for
+ // it earlier in the pipeline, rather than pretend to hide the data at the end of the pipeline.
+ const bool is_minimized = (viewport->Flags & ImGuiViewportFlags_Minimized) != 0;
+
ImDrawData* draw_data = &viewport->DrawDataP;
viewport->DrawData = draw_data; // Make publicly accessible
draw_data->Valid = true;
@@ -4370,7 +4377,7 @@
draw_data->CmdListsCount = draw_lists->Size;
draw_data->TotalVtxCount = draw_data->TotalIdxCount = 0;
draw_data->DisplayPos = viewport->Pos;
- draw_data->DisplaySize = viewport->Size;
+ draw_data->DisplaySize = is_minimized ? ImVec2(0.0f, 0.0f) : viewport->Size;
draw_data->FramebufferScale = ImGui::GetIO().DisplayFramebufferScale; // FIXME-VIEWPORT: This may vary on a per-monitor/viewport basis?
draw_data->OwnerViewport = viewport;
for (int n = 0; n < draw_lists->Size; n++)
