Method DebugTextEncoding

Contrib/imgui/imgui.cpp:13180–13213

Helper tool to diagnose between text encoding issues and font loading issues. Pass your UTF-8 string and verify that there are correct.

// Helper tool to diagnose between text encoding issues and font loading issues. Pass your UTF-8 string and verify that there are correct.
void ImGui::DebugTextEncoding(const char* str)
{
    Text("Text: \"%s\"", str);
    if (!BeginTable("list", 4, ImGuiTableFlags_Borders | ImGuiTableFlags_RowBg | ImGuiTableFlags_SizingFixedFit))
        return;
    TableSetupColumn("Offset");
    TableSetupColumn("UTF-8");
    TableSetupColumn("Glyph");
    TableSetupColumn("Codepoint");
    TableHeadersRow();
    for (const char* p = str; *p != 0; )
    {
        unsigned int c;
        const int c_utf8_len = ImTextCharFromUtf8(&c, p, NULL);
        TableNextColumn();
        Text("%d", (int)(p - str));
        TableNextColumn();
        for (int byte_index = 0; byte_index < c_utf8_len; byte_index++)
        {
            if (byte_index > 0)
                SameLine();
            Text("0x%02X", (int)(unsigned char)p[byte_index]);
        }
        TableNextColumn();
        if (GetFont()->FindGlyphNoFallback((ImWchar)c))
            TextUnformatted(p, p + c_utf8_len);
        else
            TextUnformatted((c == IM_UNICODE_CODEPOINT_INVALID) ? "[invalid]" : "[missing]");
        TableNextColumn();
        Text("U+%04X", (int)c);
        p += c_utf8_len;
    }
    EndTable();
}

// Avoid naming collision with imgui_demo.cpp's HelpMarker() for unity builds.
static void MetricsHelpMarker(const char* desc)