Method DebugNodeFont

tutorials/common/imgui/imgui.cpp:13600–13689

[DEBUG] Display details for a single font, called by ShowStyleEditor().

// [DEBUG] Display details for a single font, called by ShowStyleEditor().
void ImGui::DebugNodeFont(ImFont* font)
{
    bool opened = TreeNode(font, "Font: \"%s\"\n%.2f px, %d glyphs, %d file(s)",
        font->ConfigData ? font->ConfigData[0].Name : "", font->FontSize, font->Glyphs.Size, font->ConfigDataCount);
    SameLine();
    if (SmallButton("Set as default"))
        GetIO().FontDefault = font;
    if (!opened)
        return;

    // Display preview text
    PushFont(font);
    Text("The quick brown fox jumps over the lazy dog");
    PopFont();

    // Display details
    SetNextItemWidth(GetFontSize() * 8);
    DragFloat("Font scale", &font->Scale, 0.005f, 0.3f, 2.0f, "%.1f");
    SameLine(); MetricsHelpMarker(
        "Note than the default embedded font is NOT meant to be scaled.\n\n"
        "Font are currently rendered into bitmaps at a given size at the time of building the atlas. "
        "You may oversample them to get some flexibility with scaling. "
        "You can also render at multiple sizes and select which one to use at runtime.\n\n"
        "(Glimmer of hope: the atlas system will be rewritten in the future to make scaling more flexible.)");
    Text("Ascent: %f, Descent: %f, Height: %f", font->Ascent, font->Descent, font->Ascent - font->Descent);
    char c_str[5];
    Text("Fallback character: '%s' (U+%04X)", ImTextCharToUtf8(c_str, font->FallbackChar), font->FallbackChar);
    Text("Ellipsis character: '%s' (U+%04X)", ImTextCharToUtf8(c_str, font->EllipsisChar), font->EllipsisChar);
    const int surface_sqrt = (int)ImSqrt((float)font->MetricsTotalSurface);
    Text("Texture Area: about %d px ~%dx%d px", font->MetricsTotalSurface, surface_sqrt, surface_sqrt);
    for (int config_i = 0; config_i < font->ConfigDataCount; config_i++)
        if (font->ConfigData)
            if (const ImFontConfig* cfg = &font->ConfigData[config_i])
                BulletText("Input %d: \'%s\', Oversample: (%d,%d), PixelSnapH: %d, Offset: (%.1f,%.1f)",
                    config_i, cfg->Name, cfg->OversampleH, cfg->OversampleV, cfg->PixelSnapH, cfg->GlyphOffset.x, cfg->GlyphOffset.y);

    // Display all glyphs of the fonts in separate pages of 256 characters
    if (TreeNode("Glyphs", "Glyphs (%d)", font->Glyphs.Size))
    {
        ImDrawList* draw_list = GetWindowDrawList();
        const ImU32 glyph_col = GetColorU32(ImGuiCol_Text);
        const float cell_size = font->FontSize * 1;
        const float cell_spacing = GetStyle().ItemSpacing.y;
        for (unsigned int base = 0; base <= IM_UNICODE_CODEPOINT_MAX; base += 256)
        {
            // Skip ahead if a large bunch of glyphs are not present in the font (test in chunks of 4k)
            // This is only a small optimization to reduce the number of iterations when IM_UNICODE_MAX_CODEPOINT
            // is large // (if ImWchar==ImWchar32 we will do at least about 272 queries here)
            if (!(base & 4095) && font->IsGlyphRangeUnused(base, base + 4095))
            {
                base += 4096 - 256;
                continue;
            }

            int count = 0;
            for (unsigned int n = 0; n < 256; n++)
                if (font->FindGlyphNoFallback((ImWchar)(base + n)))
                    count++;