veloq-vis 0.4.1

Source-neutral visualization scene and SVG rendering helpers for VeloQ.
Documentation 
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use crate::VizRole;

pub(super) const INTERVAL_LABEL_FONT_PX: f64 = 9.0;
pub(super) const INTERVAL_LABEL_PADDING_X: f64 = 1.0;
pub(super) const INTERVAL_LABEL_BASELINE_OFFSET_PX: f64 = 10.8;
pub(super) const INTERVAL_LABEL_MIN_WIDTH_PX: f64 = 18.0;

pub(super) struct ItemStyle {
    pub(super) height: f64,
    pub(super) y_offset: f64,
    pub(super) opacity: f64,
}

pub(super) fn item_style(
    track_role: VizRole,
    item_role: VizRole,
    class: Option<&str>,
) -> ItemStyle {
    match (track_role, item_role) {
        (_, VizRole::Overlay) => ItemStyle {
            height: 14.0,
            y_offset: 0.0,
            opacity: 0.30,
        },
        (VizRole::Summary, _) => ItemStyle {
            height: 8.0,
            y_offset: 3.0,
            opacity: item_opacity(class).min(0.58),
        },
        _ => ItemStyle {
            height: 14.0,
            y_offset: 0.0,
            opacity: item_opacity(class),
        },
    }
}

pub(super) fn suppress_role_label(track_role: VizRole, item_role: VizRole) -> bool {
    matches!(track_role, VizRole::Summary) || matches!(item_role, VizRole::Overlay)
}
pub(super) fn item_color(class: Option<&str>) -> &'static str {
    match class {
        Some("kernel") => "#2563eb",
        Some("memcpy") => "#0891b2",
        Some("memset") => "#0d9488",
        Some("graph") => "#7c3aed",
        Some("gap") => "#ef4444",
        Some("api" | "runtime") => "#64748b",
        Some("nvtx") => "#16a34a",
        _ => "#334155",
    }
}

pub(super) fn item_opacity(class: Option<&str>) -> f64 {
    match class {
        Some("gap") => 0.72,
        Some("nvtx") => 0.88,
        _ => 1.0,
    }
}

pub(super) fn density_opacity(total_duration_ns: i64, bin_span_ns: i64) -> f64 {
    if total_duration_ns <= 0 || bin_span_ns <= 0 {
        return 0.18;
    }
    let density = (total_duration_ns as f64 / bin_span_ns as f64).clamp(0.0, 1.0);
    0.18 + density.sqrt() * 0.50
}