dotCooCoo
767120f6ca
arc added 2π to its sweep in a loop until the sweep was no longer negative, and arcn subtracted 2π the same way. For an angle of 10^18 degrees the loop took about 3e15 passes, and from 2^56 radians (about 4.1e18 degrees) up, adding 2π left the sweep unchanged and the loop never ended. A sweep that needed no loop, as in 0 10^18 arc, was passed unchanged to kurbo, which divides it into more than 1e16 curves (about four per turn at a radius of 10), and arc appended each curve to the path. Importing an EPS file probes it with effectcraft_pdf::parse, which has no time limit, so importing such a file did not finish. As in storytold/vectorcraft#1062, every arc now starts at the first angle's remainder after whole turns, and when the second angle is below the first (arc) or above it (arcn), the sweep is worked out from the two angles' remainders. A sweep of up to 1,024 turns is drawn whole. For a longer one, the import records a skip note ("arc (too many turns)") and leaves out whole pairs of turns, so that between 1,022 and 1,024 turns remain. The arc still ends at the second angle, and an even-odd fill covers the same area as the full sweep. Arcs of up to 1,024 turns whose angles are within about 10^6 degrees are unchanged apart from rounding, except some whose angles are a whole number of turns apart or within rounding of that. For larger angles, the old conversion to radians lost precision: at 10^15 degrees, a quarter-turn arc swept 1.5723 radians instead of 1.5708. When raising (arc) or lowering (arcn) the second angle by whole turns makes it equal to the first, as in 7 -353 arc or 2 362 arcn, rounding sometimes made the old loop add a turn and draw a full circle. Those arcs are now empty, as the PostScript Language Reference defines them. When the raised or lowered angle falls just short of the first instead, the reference defines a full circle, and each version leaves some of these arcs empty: the old code drew nothing for 125.00000000000001 125 arc, which the new code draws as a full circle, and the new code draws nothing for 1.0000000000000002 -719 arc, which the old code drew as a full circle. arcs_with_huge_angles_end_at_their_second_angle parses each program on a thread of its own and fails when no result arrives within 20 seconds.
effectcraft-pdf
Vector footage from PDF files, PDF-compatible Adobe Illustrator files (.ai, which are PDF
documents) and Encapsulated PostScript (.eps). Files parse into the same render tree as SVG
(effectcraft_svg::Doc), so they rasterise at any scale (Continuously Rasterize), convert to shape
layers (Layer ▸ Create ▸ Create Shapes from Vector Layer) and import as compositions with one
layer per file layer (File ▸ Import ▸ Composition).
Specifications used: ISO 32000-1:2008 (PDF 1.7; the public Adobe edition) for the file
structure, filters, content streams, graphics state, colour spaces, functions, shadings, text,
fonts, images, patterns, transparency (blend modes, soft masks) and optional content; Adobe
Technical Note #5176 (The Compact Font Format Specification) and #5177 (The Type 2
Charstring Format) for CFF font programs; Adobe Type 1 Font Format (version 1.1) for Type 1
font programs; the PostScript Language Reference, third edition and the Encapsulated
PostScript File Format Specification 3.0 for EPS; ITU-T T.4 (07/2003) and ITU-T T.6
(11/1988) for CCITT fax images. TrueType font programs are read through skrifa and JPEG (DCT)
images through zune-jpeg (both permissively licensed, pure Rust). No third-party
PDF/PostScript/font/codec code was read; test files (including the CFF and Type 1 fonts and the
CCITT data) are generated in code (write and the tests). One CCITT fixture was
produced once by libtiff's tiffcp (an external encoder used only as a fixture generator, like
ffmpeg elsewhere) to check the code tables against an independent implementation.
What is read
-
Structure: indirect objects found by scanning (damaged or incremental cross-reference sections do not matter), object streams, the page tree with inherited resources, MediaBox / CropBox and
/Rotate. Filters: Flate (with PNG predictors), LZW, ASCIIHex, ASCII85, RunLength, CCITTFax (Group 3 one- and two-dimensional, Group 4;K,Columns,Rows,EndOfLine,EncodedByteAlign,EndOfBlock,BlackIs1; damaged data keeps the rows decoded before the damage). Encrypted files are refused. -
Content:
q/Q,cm, line width / cap / join / miter / dash, ExtGState (CA,ca,LW,LC,LJ,ML,D), all path construction and painting operators (non-zero and even-odd), clipping (W,W*) as clipping groups, colour in DeviceGray / RGB / CMYK, ICCBased (by component count), CalGray / CalRGB, Lab, Indexed, Separation and DeviceN (tint transforms of function types 0, 2 and 3), axial and radial shadings as pattern fills and throughsh, form XObjects (matrix, bounding-box clip, nested resources). -
Layers: top-level optional-content marked sequences (
/OC … BDC, Illustrator's layers) become the document's layers, named after their OCG; content outside them is gathered into layers "Layer N". -
EPS: a PostScript interpreter for the subset exported vector EPS uses: operand and dictionary stacks, procedures and
def/bind/load/where, arithmetic, comparisons,if/ifelse/for/repeat/loop/forall, arrays and strings,gsave/grestore,save/restore, matrices (concat,translate,scale,rotate,transform…), path construction includingarc/arcnand relative operators,fill/eofill/stroke,clip/eoclip,rectfill/rectstroke/rectclip, gray / RGB / CMYK / HSB colour. DOS EPS binary headers and%%HiResBoundingBox/%%BoundingBoxare honoured;%%BeginData/%%BeginBinary/ preview sections are skipped. Text:findfont/findresource,scalefont,makefont,selectfont,setfont,currentfont,definefont(re-encoded copies made withforalland a new/Encoding),StandardEncoding/ISOLatin1Encoding,show,ashow,widthshow,awidthshow,xshow/yshow/xyshow,kshow/cshow(the procedure is not run),glyphshow,charpath(glyph outlines join the path, e.g. for clipping) andstringwidth. Fonts embedded in the file — Type 1 programs (… currentfile eexec … cleartomark, binary or hexadecimal) and CFF font sets (StartData) — are found by name before the program runs; other fonts are drawn with the bundled fonts as for PDF. Eachshowbecomes one compound shape named "Text: …". -
Text (§9): text objects and state (
Tc,Tw,Tz,TL,Ts,Tr,Tf,Td,TD,Tm,T*),Tj,TJ(with kerning),'and"; render modes fill / stroke / fill-and-stroke / invisible and the clipping modes (glyph outlines clip untilQ). Glyphs become outlines (one compound shape per show operator, named "Text: …" after the string throughToUnicodeor the glyph names). Fonts: simple fonts with/Widths, base encodings (Standard, WinAnsi, MacRoman),/Differencesand built-in encodings; composite (Type 0) fonts with Identity-H / Identity-V and embedded CMaps (cidrange/cidchar,/WMode),/Wand/DWwidths, vertical metrics (/W2,/DW2: the vertical displacement and the position vector from the horizontal to the vertical origin) andCIDToGIDMap. Embedded programs: TrueType (FontFile2, cmap (3,1) / (3,0) / (1,0) andpostnames), CFF (FontFile3/Type1C,/CIDFontType0C,/OpenType; name-keyed and CID-keyed with FDArray / FDSelect, flex, hint masks,seac), Type 1 (FontFile, eexec,/Subrs, flex and hint replacement through othersubrs,seac) and Type 3 glyph procedures. Fonts that are not embedded (the standard 14 and others) are drawn with the bundled OFL fonts by name: Inter (sans serif, Regular / Italic / SemiBold / Bold), Noto Serif (Times and other serif names) and JetBrains Mono (Courier), with their own advances when the PDF gives no widths. -
Images (§8.9): image XObjects and inline images (
BI … ID … EI, abbreviated keys); 1, 2, 4, 8 and 16 bits per component with/Decode; any colour space above (Indexed through its palette, ICCBased through its/Alternatespace); DCT (JPEG, through zune-jpeg; Adobe inverted CMYK) and the general filters; stencil masks (/ImageMask) in the fill colour; soft masks (/SMaskimages) and colour-key and explicit/Masks. Images become image nodes of the render tree (bilinear, box-filtered when minified). -
Transparency: blend modes (
/BM, all 16 PDF modes) and soft masks in the graphics state (/SMaskwith/S /Luminosityand/BCbackdrops, or/S /Alpha) as groups of the render tree, open until the state changes orQ: what is painted while a soft mask is set is rendered to an offscreen buffer and the mask applies to that combined result. Transparency group XObjects (§11.6.6) composite as one object: the current alpha, blend mode and soft mask apply to the group's result, and its contents start from the initial alpha. Isolated groups (/I true) composite over a transparent backdrop; non-isolated groups over the page, with the backdrop's contribution removed again (§11.4.8) so group alpha and masks apply only to the group; knockout groups (/K true) composite each child with the group's initial backdrop. Clipping groups are not transparency groups: blend modes inside them reach the backdrop. -
Patterns: tiling patterns (coloured and uncoloured,
XStep/YStep, the cell clipped to/BBox, at most 4096 tiles per fill) for fills; strokes with a tiling pattern use its colour (uncoloured) or grey. -
Shadings (§8.7.4.5): axial and radial shadings become gradients. Function-based shadings (type 1,
DomainandMatrix) and the mesh shadings — free-form (type 4, edge flags 0–2) and lattice-form (type 5) Gouraud-shaded triangle meshes, Coons patch meshes (type 6) and tensor-product patch meshes (type 7, flags 0–3 sharing the previous patch's edges) withBitsPerCoordinate/BitsPerComponent/BitsPerFlag/Decodeand an optional parametricFunction— are rasterised into an image node in page space (up to 4 pixels per point, at most 1024 pixels a side, 2×2 supersampled): patches are tessellated into triangles (up to 48×48 cells), colours (ort) interpolated across each triangle. They paint throughsh(their own extent only) and as shading-pattern fills (clipped to the path). -
Functions: sampled (one or several inputs, multilinear interpolation), exponential, stitching and PostScript calculator (type 4) functions.
-
Pages: any page ([
parse_page], [page_count]); File ▸ Import takespage(from 1) and the Import dialog asks for it; footage remembers its page (Footage::page).
Limitations
- JPX and JBIG2 images, predefined CJK CMaps other than Identity-H / Identity-V, and transfer
functions (
/TR) are not read. JBIG2 is deferred. Predefined CMaps (UniGB-UCS2-H,90ms-RKSJ-H…) need the CMap data, and there is no permissively licensed pure-Rust source of it (Adobe's CMap resources are Adobe assets, which this project does not ship); text in such fonts is reported inDoc::skipped. Mesh shadings are raster images in the render tree (sharp to about 4× the document size). Knockout uses each child's coverage as its shape (a child with constant opacity knocks out fully where it covers). What a document skipped is listed inDoc::skipped. - Illustrator EPS files whose drawing depends on Adobe's procedure-set resources (defined in
the file through constructs beyond this subset) and Level 3
shfillgradients in EPS draw only what the subset understands; save such artwork as PDF-compatible.aior PDF instead. EPS images are skipped; Type 3 (procedure) fonts defined in EPS files draw nothing (reported). - Create Shapes from Vector Layer: clips that enclose the whole page become layer masks
(the first clip Add, later ones Intersect). Nested clipping groups become Merge Paths: each
closed shape inside them is a group with its geometry merged into one compound path, the clip
paths, and Merge Paths ▸ Intersect before its fill and stroke, so fills match exactly and
strokes follow the clipped outline; open stroked paths inside clips stay unclipped. Blend
modes become the groups' Blend Mode. Images become footage layers: each is written as
<file> Image <n>.pngnext to the source and imported, placed by its matrix (anchor at its top-left corner; position, rotation and scale — a skew is reported) and parented to the shape layer; the shapes drawn between images go to shape layers of their own (<name> Outlines <n>), so the layer stack keeps the document's paint order. Soft masks, and the clips and masks of images, are not converted (the command'sskippedlist says so).