dear-imgui-rs 0.16.0

High-level Rust bindings to Dear ImGui v1.92.9b with docking, WGPU/GL backends, and extensions (ImPlot/ImPlot3D, ImNodes, ImGuizmo, file browser, reflection-based UI)
Documentation 
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use super::*;

fn empty_draw_data(total_idx_count: i32, total_vtx_count: i32) -> DrawData {
    let mut raw = sys::ImDrawData::default();
    raw.TotalIdxCount = total_idx_count;
    raw.TotalVtxCount = total_vtx_count;
    raw.FramebufferScale = sys::ImVec2 { x: 1.0, y: 1.0 };
    DrawData(raw)
}

#[test]
fn draw_list_count_comes_from_the_vector_not_the_frame_counter() {
    let mut lists = [std::ptr::null_mut(), std::ptr::null_mut()];
    let mut raw = sys::ImDrawData::default();
    raw.FrameCount = 97;
    raw.CmdLists.Size = 2;
    raw.CmdLists.Capacity = 2;
    raw.CmdLists.Data = lists.as_mut_ptr();
    let draw_data = DrawData(raw);

    assert_eq!(draw_data.frame_count(), 97);
    assert_eq!(draw_data.draw_lists_count(), 2);
}

#[test]
fn draw_data_counts_are_checked_usize_counts() {
    let draw_data = empty_draw_data(7, 11);
    let total_idx_count: usize = draw_data.total_idx_count();
    let total_vtx_count: usize = draw_data.total_vtx_count();
    assert_eq!(total_idx_count, 7);
    assert_eq!(total_vtx_count, 11);

    let negative_idx_count = empty_draw_data(-1, 0);
    assert!(
        std::panic::catch_unwind(|| negative_idx_count.total_idx_count()).is_err(),
        "negative raw index counts must not cross the safe API boundary"
    );

    let negative_vtx_count = empty_draw_data(0, -1);
    assert!(
        std::panic::catch_unwind(|| negative_vtx_count.total_vtx_count()).is_err(),
        "negative raw vertex counts must not cross the safe API boundary"
    );
}

#[test]
fn draw_data_textures_empty_is_safe() {
    let mut textures_vec = sys::ImVector_ImTextureDataPtr::default();

    let mut raw = sys::ImDrawData::default();
    raw.FramebufferScale = sys::ImVec2 { x: 1.0, y: 1.0 };
    raw.Textures = &mut textures_vec;
    let draw_data = DrawData(raw);

    assert_eq!(draw_data.textures().count(), 0);

    let mut textures_vec = sys::ImVector_ImTextureDataPtr {
        Size: 1,
        Data: std::ptr::null_mut(),
        ..sys::ImVector_ImTextureDataPtr::default()
    };
    let mut raw = sys::ImDrawData::default();
    raw.FramebufferScale = sys::ImVec2 { x: 1.0, y: 1.0 };
    raw.Textures = &mut textures_vec;
    let draw_data = DrawData(raw);
    assert_eq!(draw_data.textures().count(), 0);
}

#[test]
fn platform_io_standard_draw_callbacks_are_classified() {
    let _guard = crate::test_support::imgui_context_guard();
    unsafe extern "C" fn reset(_parent_list: *const sys::ImDrawList, _cmd: *const sys::ImDrawCmd) {}
    unsafe extern "C" fn linear(_parent_list: *const sys::ImDrawList, _cmd: *const sys::ImDrawCmd) {
    }
    unsafe extern "C" fn nearest(
        _parent_list: *const sys::ImDrawList,
        _cmd: *const sys::ImDrawCmd,
    ) {
    }

    let mut ctx = crate::Context::create();
    let platform_io = ctx.platform_io_mut();
    unsafe {
        platform_io.set_draw_callback_reset_render_state_raw(Some(reset));
        platform_io.set_draw_callback_set_sampler_linear_raw(Some(linear));
        platform_io.set_draw_callback_set_sampler_nearest_raw(Some(nearest));
    }

    assert_eq!(
        classify_standard_draw_callback(Some(reset)),
        Some(StandardDrawCallback::ResetRenderState)
    );
    assert_eq!(
        classify_standard_draw_callback(Some(linear)),
        Some(StandardDrawCallback::SetSamplerLinear)
    );
    assert_eq!(
        classify_standard_draw_callback(Some(nearest)),
        Some(StandardDrawCallback::SetSamplerNearest)
    );
}