Function SetupViewportDrawData

extern/imgui/imgui.cpp:5263–5290

}

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/backends 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;

    ImGuiIO& io = ImGui::GetIO();
    ImDrawData* draw_data = &viewport->DrawDataP;
    viewport->DrawData = draw_data; // Make publicly accessible
    draw_data->Valid = true;
    draw_data->CmdLists = (draw_lists->Size > 0) ? draw_lists->Data : NULL;
    draw_data->CmdListsCount = draw_lists->Size;
    draw_data->TotalVtxCount = draw_data->TotalIdxCount = 0;
    draw_data->DisplayPos = viewport->Pos;
    draw_data->DisplaySize = is_minimized ? ImVec2(0.0f, 0.0f) : viewport->Size;
    draw_data->FramebufferScale = io.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++)
    {
        ImDrawList* draw_list = draw_lists->Data[n];
        draw_list->_PopUnusedDrawCmd();
        draw_data->TotalVtxCount += draw_list->VtxBuffer.Size;
        draw_data->TotalIdxCount += draw_list->IdxBuffer.Size;
    }
}

// Push a clipping rectangle for both ImGui logic (hit-testing etc.) and low-level ImDrawList rendering.
// - When using this function it is sane to ensure that float are perfectly rounded to integer values,