Inconsistent result between AddImageRounded and AddImage

[pozemka]

Version/Branch of Dear ImGui:

v1.90.2 WIP docking

Back-ends:

imgui_impl_win32.h + imgui_impl_dx11.h

Compiler, OS:

Windows 10 + MSVC 2022

Full config/build information:

No response

Details:

Hello!

I am drawing two images in the same place. Background is drawn with AddImageRounded. Foreground is drawn with AddImage

Here black image is drawn using AddImage (same result is for AddImageRounded with 0.0f corner radius).

Here black image is drawn using AddImageRounded with 25.0f corner radius

Zoom of the second image:

as you can see in the second case black image looks moved half pixel up.

draw_list->AddImageRounded(texture.texid,
                           bb0,
                           bb1,
                           ImVec2 {0.f, 0.f},
                           ImVec2 {1.f, 1.f},
                           IM_COL32_WHITE,
                           25.0f);
draw_list->AddImage(texture2.texid,
                           bb0,
                           bb1);

The reason is that bb0.y has value 1190.5. When I apply flooring to y coordinate, both images are aligned perfectly.

This may be expected for someone, but for me it was confusing to find out that two very similar functions (or even AddImageRounded with radius <0.5f) behave different. Not sure if this is a defect report or just observation.