Function draw_graph_window

application/src/gui.cpp:463–525

}

void draw_graph_window(Config &ctx) {
    std::array<char, 0x40> buf;
    std::snprintf(buf.data(), buf.size(), "Gamma ramps (%s)###gammaramp",
        ctx.is_editing_day_profile ? "day" : ctx.is_editing_night_profile ? "night" : "none");

    if (!im::Begin(buf.data(), nullptr, ImGuiWindowFlags_NoInputs | ImGuiWindowFlags_NoResize |
            ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove))
        return;
    FZ_SCOPEGUARD([] { im::End(); });

    auto [width, height] = im::GetIO().DisplaySize;
    im::SetWindowPos( { 0.53f * width, 0.60f * height }, ImGuiCond_Always);
    im::SetWindowSize({ 0.38f * width, 0.35f * height }, ImGuiCond_Always);

    FizeauSettings set = ctx.is_editing_day_profile ? ctx.profile.day_settings : ctx.profile.night_settings;

    // Calculate ramps
    std::array<std::uint16_t, 256> lut1;
    std::array<std::uint16_t, 960> lut2;

    float off = (1.0f - contrast_slant(set.contrast)) / 2.0f;
    degamma_ramp(lut1.data(), lut1.size(), DEFAULT_GAMMA, 8);
    regamma_ramp(lut2.data(), lut2.size(), set.gamma, 8, 0.0f, 1.0f, off);

    apply_luma(lut2.data(), lut2.size(), 8, set.luminance);
    apply_range(lut2.data(), lut2.size(), 8, set.range.lo, std::min(set.range.hi, lut2.back() / 255.0f));

    std::array<float, 2>           linear = { 0, 1 };
    std::array<float, lut1.size()> lut1_float;
    std::array<float, lut2.size()> lut2_float;

    std::transform(lut1.begin(), lut1.end(), lut1_float.begin(), [](std::uint16_t val) { return static_cast<float>(val) / 255.0f; });
    std::transform(lut2.begin(), lut2.end(), lut2_float.begin(), [](std::uint16_t val) { return static_cast<float>(val) / 255.0f; });

    auto &style = im::GetStyle();
    auto *window = im::GetCurrentWindow();

    ImVec2 frame_size = { 0.95f * window->Size.x, 0.75f * window->Size.y };

    const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + frame_size);
    const ImRect inner_bb(frame_bb.Min + style.FramePadding, frame_bb.Max - style.FramePadding);
    im::ItemSize(frame_bb, style.FramePadding.y);
    if (!im::ItemAdd(frame_bb, 0, &frame_bb))
        return;
    im::RenderFrame(frame_bb.Min, frame_bb.Max, im::GetColorU32(ImGuiCol_FrameBg), true, style.FrameRounding);

    // Draw grid
    int nb_x_ticks = 7, nb_y_ticks = 5;
    auto grid_col = IM_COL32(127.0f, 127.0f, 127.0f, 200.0f);
    for (int i = 0; i < nb_x_ticks; ++i) {
        float x = ImLerp(inner_bb.Min.x, inner_bb.Max.x, static_cast<float>(i) / static_cast<float>(nb_x_ticks - 1));
        window->DrawList->AddLine({ x, inner_bb.Min.y }, { x, inner_bb.Max.y }, grid_col);
    }
    for (int i = 0; i < nb_x_ticks; ++i) {
        float y = ImLerp(inner_bb.Min.y, inner_bb.Max.y, static_cast<float>(i) / static_cast<float>(nb_y_ticks - 1));
        window->DrawList->AddLine({ inner_bb.Min.x, y }, { inner_bb.Max.x, y }, grid_col);
    }