forked from 1b-agent/opencadstudio-upstream
Hakan SevenandClaude Opus 4.8
70702d063f
Phase 4.1. Handle / u64 keys dominate the hot maps (block_defn, hatch / image / mesh caches, draw-depth map, viewport wire caches); the default SipHash is wasted work on integer keys. Alias the std types to rustc_hash::FxHashMap / FxHashSet crate-wide so every map and set — including the cross-module draw-depth map shared between scene and the GPU pipelines — uses the faster hasher consistently. Mechanical: no behavioural change. Constructors moved from ::new() to ::default() (Fx variants carry no RandomState). Build + 13 tests green. Co-Authored-By: Claude Opus 4.8 <[email protected]>
282 lines
11 KiB
Rust
282 lines
11 KiB
Rust
//! Plot Style Table — CTB (color-based) and STB (named) file support.
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//!
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//! CTB files map AutoCAD Color Index (ACI, 1-255) to pen properties:
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//! RGB color override, lineweight, and screeing percentage.
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//!
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//! File format: deflate-compressed text (key = value pairs) with
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//! 255 `begin_plot_style … end_plot_style` blocks.
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//!
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//! STB files follow the same format but use named styles instead of
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//! ACI indices; they are read into a `Vec<NamedPlotStyle>`.
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use rustc_hash::FxHashMap as HashMap;
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use std::io::Read;
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use std::path::Path;
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// ── AutoCAD standard lineweight table (index → mm) ───────────────────────────
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/// Lineweight table: index value → mm, matching AutoCAD's LWEIGHT codes.
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/// Index 0 = 0.00 mm (hairline), others follow the DXF lineweight enum.
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pub const LW_TABLE: &[f32] = &[
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0.00, 0.05, 0.09, 0.10, 0.13, 0.15, 0.18, 0.20, 0.25, 0.30, 0.35, 0.40, 0.50, 0.53, 0.60, 0.70,
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0.80, 0.90, 1.00, 1.06, 1.20, 1.40, 1.58, 2.00, 2.11,
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];
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// ── Per-color entry ───────────────────────────────────────────────────────────
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/// A single entry in a CTB or STB plot style table.
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#[derive(Debug, Clone)]
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pub struct PlotStyleEntry {
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/// Optional display name (empty for CTB; the style name for STB).
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pub description: String,
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/// If `Some([r,g,b])`, override the entity color with this RGB value (0..255).
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/// If `None`, use the object color.
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pub color: Option<[u8; 3]>,
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/// Lineweight index into `LW_TABLE`. 255 = use object lineweight.
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pub lineweight: u8,
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/// Screen percentage 0–100 (100 = opaque).
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pub screening: u8,
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}
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impl Default for PlotStyleEntry {
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fn default() -> Self {
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PlotStyleEntry {
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description: String::new(),
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color: None,
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lineweight: 255, // use object lineweight
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screening: 100,
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}
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}
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}
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// ── Plot Style Table ──────────────────────────────────────────────────────────
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/// A loaded CTB or STB plot style table.
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#[derive(Debug, Clone)]
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#[allow(dead_code)]
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pub struct PlotStyleTable {
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/// File name (without path), e.g. "monochrome.ctb".
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pub name: String,
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/// Whether this is a named-style (STB) table rather than color-based (CTB).
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pub is_stb: bool,
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/// For CTB: entries indexed by ACI (index 0 unused; 1..=255 are valid).
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pub aci_entries: Vec<PlotStyleEntry>, // 256 entries, index = ACI
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/// For STB: named style entries.
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pub named_entries: HashMap<String, PlotStyleEntry>,
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}
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impl PlotStyleTable {
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/// Create an identity CTB table (no overrides for any color).
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pub fn identity(name: impl Into<String>) -> Self {
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PlotStyleTable {
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name: name.into(),
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is_stb: false,
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aci_entries: (0..=255).map(|_| PlotStyleEntry::default()).collect(),
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named_entries: HashMap::default(),
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}
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}
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/// Load a CTB or STB file from disk.
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pub fn load(path: &Path) -> Result<Self, String> {
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let raw = std::fs::read(path).map_err(|e| e.to_string())?;
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let name = path
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.file_name()
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.unwrap_or_default()
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.to_string_lossy()
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.into_owned();
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let is_stb = name.to_lowercase().ends_with(".stb");
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let text = decompress_ctb(&raw)?;
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parse_plot_style_text(&text, name, is_stb)
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}
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/// Write this table to disk as a CTB/STB file.
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#[allow(dead_code)]
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pub fn save(&self, path: &Path) -> Result<(), String> {
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let text = self.to_text();
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let compressed = compress_ctb(text.as_bytes())?;
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std::fs::write(path, compressed).map_err(|e| e.to_string())
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}
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/// Resolve the effective print RGB color for the given ACI index.
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/// Returns None if no override (use object color).
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pub fn resolve_color(&self, aci: u8) -> Option<[f32; 3]> {
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let entry = self.aci_entries.get(aci as usize)?;
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entry
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.color
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.map(|[r, g, b]| [r as f32 / 255.0, g as f32 / 255.0, b as f32 / 255.0])
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}
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/// Resolve the effective lineweight in mm for the given ACI index.
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/// Returns None if no override (use object lineweight).
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pub fn resolve_lineweight(&self, aci: u8) -> Option<f32> {
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let entry = self.aci_entries.get(aci as usize)?;
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if entry.lineweight == 255 {
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None
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} else {
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LW_TABLE.get(entry.lineweight as usize).copied()
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}
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}
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// ── Internal serialisation ────────────────────────────────────────────
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fn to_text(&self) -> String {
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let mut s = String::new();
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s.push_str("description=\n");
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s.push_str("apply_factor=0\n");
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s.push_str("unit_type=1\n");
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s.push_str("custom_lineweight_display_units=0\n");
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for (_idx, entry) in self.aci_entries.iter().enumerate().skip(1) {
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s.push_str("begin_plot_style\n");
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s.push_str(&format!(" description={}\n", entry.description));
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s.push_str(" physical_pen_number=0\n");
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s.push_str(" virtual_pen_number=0\n");
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s.push_str(&format!(" screen={}\n", entry.screening));
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s.push_str(" linepattern_size=0.5\n");
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s.push_str(" linetype=31\n");
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s.push_str(" adaptive_linetype=TRUE\n");
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s.push_str(&format!(" lineweight={}\n", entry.lineweight));
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s.push_str(" fill_style=64\n");
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s.push_str(" end_style=0\n");
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s.push_str(" join_style=0\n");
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if let Some([r, g, b]) = entry.color {
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s.push_str(&format!(" color1=#{:02X}{:02X}{:02X}\n", r, g, b));
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} else {
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// 0xC2000000 = "use object color"
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s.push_str(" color1=-1056964608\n");
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}
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s.push_str("end_plot_style\n");
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}
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s
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}
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}
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// ── Deflate helpers ───────────────────────────────────────────────────────────
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/// Decompress a CTB/STB file's raw bytes into the text content.
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///
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/// CTB files start with a plain-text header (first line: "PIAFILEVERSION_2.0")
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/// followed by raw-deflate compressed content. Some tools write pure zlib
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/// (with the two-byte zlib header 0x78 0x9C) instead — we handle both.
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fn decompress_ctb(data: &[u8]) -> Result<String, String> {
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// Find the first newline — everything after it is the compressed payload.
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let split_at = data
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.iter()
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.position(|&b| b == b'\n')
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.map(|p| p + 1)
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.unwrap_or(0);
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let payload = &data[split_at..];
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// Try zlib (0x78 prefix) first, then raw deflate.
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let mut text = String::new();
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if payload.starts_with(&[0x78]) {
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use flate2::read::ZlibDecoder;
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ZlibDecoder::new(payload)
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.read_to_string(&mut text)
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.map_err(|e| format!("zlib decompress: {e}"))?;
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} else {
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use flate2::read::DeflateDecoder;
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DeflateDecoder::new(payload)
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.read_to_string(&mut text)
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.map_err(|e| format!("deflate decompress: {e}"))?;
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}
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Ok(text)
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}
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/// Compress plot-style text content as a CTB/STB file.
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fn compress_ctb(text: &[u8]) -> Result<Vec<u8>, String> {
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use flate2::{write::ZlibEncoder, Compression};
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use std::io::Write;
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let header = b"PIAFILEVERSION_2.0\r\n";
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let mut compressed: Vec<u8> = Vec::new();
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{
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let mut enc = ZlibEncoder::new(&mut compressed, Compression::default());
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enc.write_all(text).map_err(|e| e.to_string())?;
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}
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let mut out = header.to_vec();
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out.extend_from_slice(&compressed);
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Ok(out)
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}
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// ── Text parser ───────────────────────────────────────────────────────────────
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fn parse_plot_style_text(text: &str, name: String, is_stb: bool) -> Result<PlotStyleTable, String> {
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let mut aci_entries: Vec<PlotStyleEntry> =
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(0..=255).map(|_| PlotStyleEntry::default()).collect();
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let mut named_entries: HashMap<String, PlotStyleEntry> = HashMap::default();
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let mut style_index: usize = 1; // CTB: 1-based ACI index
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let mut current: Option<PlotStyleEntry> = None;
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let mut current_name: String = String::new();
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for line in text.lines() {
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let line = line.trim();
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if line == "begin_plot_style" {
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current = Some(PlotStyleEntry::default());
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current_name = format!("Color_{}", style_index);
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continue;
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}
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if line == "end_plot_style" {
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if let Some(entry) = current.take() {
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if is_stb {
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named_entries.insert(current_name.clone(), entry);
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} else if style_index <= 255 {
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aci_entries[style_index] = entry;
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style_index += 1;
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}
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}
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continue;
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}
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let Some(entry) = current.as_mut() else {
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continue;
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};
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if let Some((key, val)) = line.split_once('=') {
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let key = key.trim();
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let val = val.trim();
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match key {
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"description" => {
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if !val.is_empty() {
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entry.description = val.to_string();
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current_name = val.to_string();
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}
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}
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"screen" => {
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if let Ok(v) = val.parse::<u8>() {
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entry.screening = v;
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}
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}
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"lineweight" => {
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if let Ok(v) = val.parse::<u8>() {
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entry.lineweight = v;
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}
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}
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"color1" => {
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if val.starts_with('#') && val.len() == 7 {
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// #RRGGBB
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let r = u8::from_str_radix(&val[1..3], 16).unwrap_or(0);
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let g = u8::from_str_radix(&val[3..5], 16).unwrap_or(0);
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let b = u8::from_str_radix(&val[5..7], 16).unwrap_or(0);
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entry.color = Some([r, g, b]);
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} else if let Ok(packed) = val.parse::<i32>() {
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// AutoCAD packs RGB as 0xC0RRGGBB negative int.
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// Value 0xC2000000 (-1056964608) = use object color.
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if packed != -1056964608i32 {
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let u = packed as u32;
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let r = ((u >> 16) & 0xFF) as u8;
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let g = ((u >> 8) & 0xFF) as u8;
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let b = (u & 0xFF) as u8;
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entry.color = Some([r, g, b]);
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}
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}
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}
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_ => {}
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}
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}
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}
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Ok(PlotStyleTable {
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name,
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is_stb,
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aci_entries,
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named_entries,
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})
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}
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