Method BuildLookupTable

lib/imgui/imgui_draw.cpp:2619–2662

}

void ImFont::BuildLookupTable()
{
    int max_codepoint = 0;
    for (int i = 0; i != Glyphs.Size; i++)
        max_codepoint = ImMax(max_codepoint, (int)Glyphs[i].Codepoint);

    // Build lookup table
    IM_ASSERT(Glyphs.Size < 0xFFFF); // -1 is reserved
    IndexAdvanceX.clear();
    IndexLookup.clear();
    DirtyLookupTables = false;
    GrowIndex(max_codepoint + 1);
    for (int i = 0; i < Glyphs.Size; i++)
    {
        int codepoint = (int)Glyphs[i].Codepoint;
        IndexAdvanceX[codepoint] = Glyphs[i].AdvanceX;
        IndexLookup[codepoint] = (ImWchar)i;
    }

    // Create a glyph to handle TAB
    // FIXME: Needs proper TAB handling but it needs to be contextualized (or we could arbitrary say that each string starts at "column 0" ?)
    if (FindGlyph((ImWchar)' '))
    {
        if (Glyphs.back().Codepoint != '\t')   // So we can call this function multiple times (FIXME: Flaky)
            Glyphs.resize(Glyphs.Size + 1);
        ImFontGlyph& tab_glyph = Glyphs.back();
        tab_glyph = *FindGlyph((ImWchar)' ');
        tab_glyph.Codepoint = '\t';
        tab_glyph.AdvanceX *= IM_TABSIZE;
        IndexAdvanceX[(int)tab_glyph.Codepoint] = (float)tab_glyph.AdvanceX;
        IndexLookup[(int)tab_glyph.Codepoint] = (ImWchar)(Glyphs.Size-1);
    }

    // Mark special glyphs as not visible (note that AddGlyph already mark as non-visible glyphs with zero-size polygons)
    SetGlyphVisible((ImWchar)' ', false);
    SetGlyphVisible((ImWchar)'\t', false);

    // Setup fall-backs
    FallbackGlyph = FindGlyphNoFallback(FallbackChar);
    FallbackAdvanceX = FallbackGlyph ? FallbackGlyph->AdvanceX : 0.0f;
    for (int i = 0; i < max_codepoint + 1; i++)
        if (IndexAdvanceX[i] < 0.0f)
            IndexAdvanceX[i] = FallbackAdvanceX;
}

void ImFont::SetGlyphVisible(ImWchar c, bool visible)
{