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Merge #603: Part of #372: .ai files write layers and sublayers as PDF layers, hidden ones kept

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# Conflicts:
#	ROADMAP.md
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bflatastic
2026-10-09 04:46:09 +07:00
parent a89f914119 50bb36ebc2
commit ef99ab8d1c
19 changed files with 223 additions and 46 deletions
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@@ -355,9 +355,11 @@ A `security` password encrypts the file (RC4 40-bit at PDF 1.3, RC4 128-bit at 1
Pattern fills and strokes are written as their tiles clipped to the area they paint (a stroke's outline, with its
dashes, caps, profile, arrowheads and alignment), and freeform gradients as an image of their colour field at the
document's raster effects resolution, clipped the same way.
`createLayers` writes each top-level layer (template layers are left out) as a PDF layer, an optional content group
named as the layer: hidden layers are off, non-printing ones have `/PrintState /OFF` and locked ones are locked. It needs
PDF 1.5 or later (at 1.4 it warns), and the file reopens with those layers.
`createLayers` writes each layer and sublayer (template layers are left out) as a PDF layer, an optional content group
named as the layer and listed under its parent layer's: hidden layers are off (their art is written, for the reader to
show), non-printing ones have `/PrintState /OFF` and locked ones are locked. It needs PDF 1.5 or later (at 1.4 it
warns), and the file reopens with those layers and sublayers. A `.ai` file writes them unless `createLayers` is false,
so apps that read its PDF part find the layers, hidden ones included; hidden objects aren't in the PDF part.
Images follow the `compression` settings of their kind (`color`, `gray`, or `mono` for black-and-white images): above
`abovePpi` as placed they are resampled (`downsample`: `average`, `subsample` or `bicubic`) to `ppi`, and compressed
with `zip`, `jpeg` (at `quality`; images with transparency stay lossless) or `auto` (JPEGs stay JPEG, the others