Method DebugNodeDrawCmdShowMeshAndBoundingBox

include/imgui/imgui.cpp:17260–17287

[DEBUG] Display mesh/aabb of a ImDrawCmd

// [DEBUG] Display mesh/aabb of a ImDrawCmd
void ImGui::DebugNodeDrawCmdShowMeshAndBoundingBox(ImDrawList* out_draw_list, const ImDrawList* draw_list, const ImDrawCmd* draw_cmd, bool show_mesh, bool show_aabb)
{
    IM_ASSERT(show_mesh || show_aabb);

    // Draw wire-frame version of all triangles
    ImRect clip_rect = draw_cmd->ClipRect;
    ImRect vtxs_rect(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX);
    ImDrawListFlags backup_flags = out_draw_list->Flags;
    out_draw_list->Flags &= ~ImDrawListFlags_AntiAliasedLines; // Disable AA on triangle outlines is more readable for very large and thin triangles.
    for (unsigned int idx_n = draw_cmd->IdxOffset, idx_end = draw_cmd->IdxOffset + draw_cmd->ElemCount; idx_n < idx_end; )
    {
        ImDrawIdx* idx_buffer = (draw_list->IdxBuffer.Size > 0) ? draw_list->IdxBuffer.Data : NULL; // We don't hold on those pointers past iterations as ->AddPolyline() may invalidate them if out_draw_list==draw_list
        ImDrawVert* vtx_buffer = draw_list->VtxBuffer.Data + draw_cmd->VtxOffset;

        ImVec2 triangle[3];
        for (int n = 0; n < 3; n++, idx_n++)
            vtxs_rect.Add((triangle[n] = vtx_buffer[idx_buffer ? idx_buffer[idx_n] : idx_n].pos));
        if (show_mesh)
            out_draw_list->AddPolyline(triangle, 3, IM_COL32(255, 255, 0, 255), ImDrawFlags_Closed, 1.0f); // In yellow: mesh triangles
    }
    // Draw bounding boxes
    if (show_aabb)
    {
        out_draw_list->AddRect(ImTrunc(clip_rect.Min), ImTrunc(clip_rect.Max), IM_COL32(255, 0, 255, 255)); // In pink: clipping rectangle submitted to GPU
        out_draw_list->AddRect(ImTrunc(vtxs_rect.Min), ImTrunc(vtxs_rect.Max), IM_COL32(0, 255, 255, 255)); // In cyan: bounding box of triangles
    }
    out_draw_list->Flags = backup_flags;
}

// [DEBUG] Compute mask of inputs with the same codepoint.
static int CalcFontGlyphSrcOverlapMask(ImFontAtlas* atlas, ImFont* font, unsigned int codepoint)