A resource dictionary's /DefaultGray, /DefaultRGB and /DefaultCMYK
replace the device spaces that color operators, cs/CS, images and
shadings select (ISO 32000-2 8.6.5.6). Decoded images and shadings are
cached per default.
Defaults follow this tree's resource scoping (a form with /Resources
sees only its own), and they do not apply on a plate, so device color
separates onto the same inks as before. PdfCraft's raster tests are
adapted in upstream_raster.rs, with a plate test in plates.rs.
A luminosity soft mask whose group is DeviceCMYK draws the group's four process plates over the backdrop and applies 1 - min(1, 0.3c + 0.59m + 0.11y + k) (ISO 32000-2 §10.4.2.2), so K 100% hides the masked object. Spot colorants on those plates paint through their alternate space (Plate::spots_as_process).
The plate helper renders all inks of a page with one render cache, as a separating caller
does, so ICC transforms are built once per page instead of once per plate. The mutated
profile test changes the header fields a reader checks instead of every 16th header byte,
and samples the tag data more sparsely: each profile that still loads costs a fifth of a
second in a debug build.
Bring storytold/pdfcraft#2974 (source commit
bae69819594a6385a027fec1f67e6b3c36c259b4) onto the vendored
hayro-interpret and hayro. Knockout transparency groups (/K true) knock
out: while one is innermost, fills, strokes, glyph outlines and shadings
are drawn with Compose::Copy, weighted by coverage. An unmasked image's
rectangle and a nested group's shape are cleared before their layer
composites; the nested group's shape comes from an erase pass over its
content. Masked images and stencils composite as before.
Code comments label the change "Knockout patch (pdfcraft #2974)": the
pull request numbers it hayro-interpret patch 39 and hayro patch 19,
which pdfcraft may renumber. The erase pass resolves resources with
Resources::from_scope, as this tree's form drawing does.
crates/pdf/tests/knockout.rs adapts the pull request's test to the
raster path (without its preview case: craft-pdf has no preview mode).
A plate-mode test checks that a knockout group of two 50% squares
separates with only the top square in the overlap. Options documents
that color_replacement also maps plate films. Ledger, NOTICE and the
source manifests are updated.
Co-authored-by: mtlcl410 <2368091+mtlcl410@users.noreply.github.com>
CmykSimulation converts process colour to an output intent's CMYK
through a color::CmykConversion: sRGB colours, and CIE XYZ relative to
the D50 PCS white (color::PCS_WHITE) for Lab and ICCBased colours.
CmykSimulation::new keeps the moxcms conversion from pdfcraft #2770,
which takes XYZ on through its ProPhoto hub; with_conversion takes a
caller's, so a crate can separate with its own colour management.
crates/pdf/tests/plates.rs adapts #2770's plate tests to the raster
path: process, spot, DeviceN, All/None, ICC CMYK, gray and RGB colours,
images, shadings, uncoloured patterns, soft masks, OP/op/OPM, the ink
sink, output-intent simulation with #2770's synthetic ICC profiles, and
a caller's conversion. The ledger and NOTICE name the pull request.
Co-authored-by: Guillem Hermida <66697068+guillehr2@users.noreply.github.com>
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