mirror of
https://github.com/storytold/vectorcraft.git
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162 lines
7.9 KiB
Rust
162 lines
7.9 KiB
Rust
//! Hand-written Illustrator editing data (the format `vectorcraft_eps`'s reader documents) and the
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//! EPS, `.ai` and PDF files that carry it, for import tests. Nothing here comes from files another
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//! app wrote, except the key names that [`pdf`] uses.
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/// Editing data of a `width` × `height` page: header comments (the art's bounding box and the crop
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/// marks are the page), `body` (setup and layers), the trailer.
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pub fn editing_data(width: f64, height: f64, body: &str) -> String {
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format!(
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"{PS_HEADER}\n%%Creator: VectorCraft tests\n%%BoundingBox: 0 0 {width} {height}\n%%HiResBoundingBox: 0 0 {width} {height}\n\
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%AI5_FileFormat 14.0\n%AI3_Cropmarks: 0 0 {width} {height}\n%%EndComments\n\
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%%BeginProlog\n%%EndProlog\n%%BeginSetup\n%%EndSetup\n{body}\n%%PageTrailer\ngsave annotatepage grestore showpage\n%%Trailer\n%%EOF\n"
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)
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}
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/// The first line of a PostScript file (the DSC version comment).
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const PS_HEADER: &str = "%!PS-Adobe-3.0"; // brand-ok: the PostScript header comment
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/// The `PieceInfo` key the private data streams are under.
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const PIECE: &str = "Illustrator"; // brand-ok: the key the files use
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/// A layer named `name` (shown, unlocked, printing, light blue) holding `art`.
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pub fn layer(name: &str, art: &str) -> String {
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format!("%AI5_BeginLayer\n1 1 1 1 0 0 1 0 79 128 255 0 50 0 Lb\n({name}) Ln\n0 A\n0 Xw\n{art}\nLB\n%AI5_EndLayer--\n")
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}
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/// The path of the rectangle `x0 y0 x1 y1` (art space: y up).
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pub fn rect(x0: f64, y0: f64, x1: f64, y1: f64) -> String {
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format!("{x0} {y0} m\n{x0} {y1} L\n{x1} {y1} L\n{x1} {y0} L\n{x0} {y0} L\n")
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}
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/// `name` given to the object before it (its XML id).
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pub fn named(name: &str) -> String {
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format!("%_/ArtDictionary :\n%_/XMLUID : ({}) ; (AI10_ArtUID) ,\n%_;\n%_\n", name.replace(' ', "_"))
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}
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/// A document of 200 × 100 pt with a bit of everything the reader reads. A layer `Art` that shows:
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/// a group `Pair` (a red square `Red` and a hidden one), a compound path `Ring`, a clipping group
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/// `Window` (a grey square seen through a smaller one), what [`page_ps`] and [`page_pdf`] draw. A
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/// hidden layer `Hidden`: a radially shaded square `Shaded`, a screened square at half opacity, a
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/// locked sublayer `Sub`, and a 2 × 1 image with an alpha channel.
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pub fn sample_data() -> Vec<u8> {
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let red = "0 1 1 0 1 0 0 Xa\n";
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let gradient =
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"%AI5_BeginGradient: (Glow)\n(Glow) 1 2 Bd\n[\n%_0 0 0 0 1 1 1 2 1 6 50 0 Bs\n%_0 0 0 1 0 0 0 2 0.5 6 50 100 Bs\nBD\n%AI5_EndGradient\n";
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let group = format!(
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"0 Ae\nu\n{red}{}f\n{}1 Xw\n0 0 1 0 0 0 1 XA\n2 w\n{}b\n0 Xw\nU\n{}9 () XW\n",
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rect(10.0, 50.0, 40.0, 90.0),
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named("Red"),
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rect(50.0, 50.0, 80.0, 90.0),
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named("Pair")
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);
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let compound = format!("0 Ae\n*u\n{red}1 XR\n{}f\n{}f\n*U\n{}", rect(100.0, 50.0, 140.0, 90.0), rect(110.0, 60.0, 130.0, 80.0), named("Ring"));
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let clip =
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format!("0 Ae\nq\n0.5 g\n{}f\n{}h\nW\nn\nQ\n{}9 () XW\n", rect(150.0, 50.0, 190.0, 90.0), rect(160.0, 60.0, 180.0, 80.0), named("Window"));
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let shaded = format!(
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"{}Bb\n1 (Glow) 0 0 0 1 1 0 0 1 0 0 1 Bg\n20 0 0 -20 30 25 Bm\nf\n0 BB\n{}2 0.5 0 0 0 Xy\n{red}{}f\n0 1 0 0 0 Xy\n",
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rect(10.0, 5.0, 50.0, 45.0),
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named("Shaded"),
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rect(60.0, 5.0, 90.0, 45.0)
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);
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let sub = "%AI5_BeginLayer\n1 1 0 1 0 0 1 2 79 255 79 0 50 0 Lb\n(Sub) Ln\n0 g\n10 10 m\n30 30 L\nS\nLB\n%AI5_EndLayer--\n";
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let mut image = b"%AI5_File:\n%AI5_BeginRaster\n() 1 XG\n/DeviceRGB XN\n\
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[ 20 0 0 20 100 40 ] 2 1 0 Xh\n[ 20 0 0 20 100 40 ] 0 0 2 1 2 1 8 3 1 17 1 0 4 4 0 0\n%%BeginData: 10\rXI\n"
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.to_vec();
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image.extend_from_slice(&[255, 0, 0, 0, 0, 255, 255, 128]);
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image.extend_from_slice(b"%%EndData\r\nXH\r\n%AI5_EndRaster\r\nN\r\n");
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let head = format!(
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"{gradient}{}%AI5_BeginLayer\n0 1 1 1 0 0 0 1 255 79 79 0 50 0 Lb\n(Hidden) Ln\n{shaded}{sub}",
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layer("Art", &format!("{group}{compound}{clip}"))
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);
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let mut body = head.into_bytes();
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body.extend_from_slice(&image);
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body.extend_from_slice(b"LB\n%AI5_EndLayer--\n");
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let mut data = editing_data(200.0, 100.0, "").into_bytes();
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let at = data.windows(14).position(|w| w == b"%%PageTrailer\n").unwrap_or(data.len());
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data.splice(at..at, body);
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data
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}
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/// The sample's page in PostScript (what shows of it).
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pub fn page_ps() -> &'static str {
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"1 0 0 setrgbcolor 10 50 30 40 rectfill\n\
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newpath 100 50 moveto 140 50 lineto 140 90 lineto 100 90 lineto closepath 110 60 moveto 130 60 lineto 130 80 lineto 110 80 lineto closepath eofill\n\
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0.5 setgray 160 60 20 20 rectfill\n"
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}
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/// The sample's page as PDF content (what shows of it).
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pub fn page_pdf() -> &'static str {
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"1 0 0 rg 10 50 30 40 re f 100 50 40 40 re 110 60 20 20 re f* 0.5 g 160 60 20 20 re f"
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}
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/// An Illustrator EPS: its page drawing `page` (PostScript, 200 × 100 pt), and the editing data
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/// `data` after it, not compressed.
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pub fn eps(data: &[u8], page: &str) -> Vec<u8> {
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let mut out = format!(
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"{PS_HEADER} EPSF-3.0\n%%Creator: VectorCraft tests\n%%BoundingBox: 0 0 200 100\n%%HiResBoundingBox: 0 0 200 100\n%%EndComments\n{page}showpage\n%%EOF\n%AI9_PrivateDataBegin\n"
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)
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.into_bytes();
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out.extend_from_slice(data);
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out.extend_from_slice(b"\n%AI9_PrivateDataEnd\n");
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out
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}
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/// An Illustrator `.ai` file: a 200 × 100 pt PDF page drawing `page` (PDF content), carrying
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/// `private` (the private data streams' contents, such as `%AI12_CompressedData` and zlib data) in
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/// two streams.
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pub fn ai(private: &[u8], page: &str) -> Vec<u8> {
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ai_with(private, page, "")
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}
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/// [`ai`] with more entries in the page dictionary (`/ArtBox [0 0 200 100]`).
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pub fn ai_with(private: &[u8], page: &str, entries: &str) -> Vec<u8> {
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with_private(private, page, "AIPrivateData", entries)
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}
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/// A PDF saved with Illustrator's editing data: [`ai`]'s file with the two streams under
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/// `AIPDFPrivateData1` and `AIPDFPrivateData2`. These key names were seen in the PDF attached to
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/// #868, and nothing else of that file is used; ExifTool's PDF tag table lists them too
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/// (<https://exiftool.org/TagNames/PDF.html>).
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pub fn pdf(private: &[u8], page: &str) -> Vec<u8> {
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with_private(private, page, "AIPDFPrivateData", "")
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}
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/// The file of [`ai`] and [`pdf`], with `private` in the streams `{key}1` and `{key}2` and
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/// `entries` more in the page dictionary.
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fn with_private(private: &[u8], page: &str, key: &str, entries: &str) -> Vec<u8> {
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let (first, second) = private.split_at(private.len() / 2);
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let stream = |part: &[u8]| {
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let mut s = format!("<< /Length {} >>\nstream\n", part.len()).into_bytes();
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s.extend_from_slice(part);
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s.extend_from_slice(b"\nendstream");
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s
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};
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let objects: Vec<Vec<u8>> = vec![
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b"<< /Type /Catalog /Pages 2 0 R >>".to_vec(),
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b"<< /Type /Pages /Kids [3 0 R] /Count 1 >>".to_vec(),
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format!(
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"<< /Type /Page /Parent 2 0 R /MediaBox [0 0 200 100] {entries} /Contents 4 0 R \
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/Resources << /Font << /F1 << /Type /Font /Subtype /Type1 /BaseFont /Helvetica >> >> >> \
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/PieceInfo << /{PIECE} << /Private << /{key}1 5 0 R /{key}2 6 0 R /NumBlock 2 >> >> >> >>"
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)
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.into_bytes(),
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stream(page.as_bytes()),
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stream(first),
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stream(second),
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];
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let mut out = b"%PDF-1.5\n".to_vec();
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let mut offsets = vec![];
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for (i, o) in objects.iter().enumerate() {
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offsets.push(out.len());
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out.extend(format!("{} 0 obj\n", i + 1).bytes());
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out.extend_from_slice(o);
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out.extend_from_slice(b"\nendobj\n");
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}
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let xref = out.len();
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out.extend(format!("xref\n0 {}\n0000000000 65535 f \n", objects.len() + 1).bytes());
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for off in offsets {
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out.extend(format!("{off:010} 00000 n \n").bytes());
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}
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out.extend(format!("trailer\n<< /Size {} /Root 1 0 R >>\nstartxref\n{xref}\n%%EOF\n", objects.len() + 1).bytes());
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out
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}
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