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bflatasticandClaude Opus 5.5
79581c7ff5
compatibility "1.3" writes a %PDF-1.3 file (its XMP metadata says 1.3 too) without transparency: a copy of the document is flattened first with flattenerPreset (stored with PDF presets; empty is High Resolution) and the flattener options over it, see-through image pixels counting as transparency and rasterized areas clipped to their regions so no soft mask is needed. Page groups are left out and the writer refuses a file that would still have transparency. PDF/X-1a and PDF/X-3 share this path (their version is now PDF 1.3; 1.4 is still accepted and written as 1.3), and with it the preset, the header and metadata code and the transparency check. Passwords at PDF 1.3 encrypt with 40-bit RC4 (revision 2). The Save PDF dialog lists PDF 1.3 and picks the flattener preset under Advanced. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
104 lines
4.6 KiB
Rust
104 lines
4.6 KiB
Rust
//! PDF presets: named [`PdfSettings`]. The built-in ones are generated here (the app default,
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//! which keeps the document editable, plus presets for print, press, small files and the PDF/X
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//! standards); the user's own live in the app's preferences.
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use serde::{Deserialize, Serialize};
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use crate::{
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BleedSettings, Compatibility, CompressionSettings, Downsample, ImageCodec, ImageCompression, JpegQuality, MonoCodec, MonoCompression,
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PdfSettings, Standard,
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};
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/// The built-in preset every PDF export starts from.
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pub const DEFAULT_PRESET: &str = "VectorCraft Default";
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/// A named set of PDF settings: a built-in preset or one the user saved.
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#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
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#[serde(rename_all = "camelCase")]
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pub struct PdfPreset {
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pub name: String,
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/// What the preset is for.
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#[serde(default, skip_serializing_if = "String::is_empty")]
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pub description: String,
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#[serde(default)]
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pub settings: PdfSettings,
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}
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/// Colour and greyscale images resampled (bicubic) to `ppi` above `above` ppi, compressed with
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/// `codec`.
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fn images(ppi: f64, above: f64, codec: ImageCodec, quality: JpegQuality) -> ImageCompression {
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ImageCompression { downsample: Downsample::Bicubic, ppi, above_ppi: above, compression: codec, quality }
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}
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/// Compression with the same settings for colour and greyscale images, and CCITT Group 4
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/// monochrome images resampled to `mono_ppi` above 1.5 × that.
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fn compression(img: ImageCompression, mono_ppi: f64) -> CompressionSettings {
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let mono = MonoCompression { downsample: Downsample::Bicubic, ppi: mono_ppi, above_ppi: mono_ppi * 1.5, compression: MonoCodec::CcittG4 };
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CompressionSettings { color: img.clone(), gray: img, mono, compress_text: true }
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}
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/// Settings for print: PDF 1.6, images kept at 300 ppi, the document's bleed when `bleed`.
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fn print(codec: ImageCodec, bleed: bool) -> PdfSettings {
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PdfSettings {
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compatibility: Compatibility::Pdf16,
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compression: compression(images(300.0, 450.0, codec, JpegQuality::Maximum), 1200.0),
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bleed: BleedSettings { use_document: bleed, ..Default::default() },
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..Default::default()
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}
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}
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/// A PDF/X preset: print settings for `standard` at PDF version `compatibility`.
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fn pdf_x(standard: Standard, compatibility: Compatibility) -> PdfSettings {
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PdfSettings { standard, compatibility, ..print(ImageCodec::Auto, true) }
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}
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/// Every built-in preset, the app default first.
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pub fn builtin_presets() -> Vec<PdfPreset> {
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let preset = |name: &str, description: &str, settings| PdfPreset { name: name.into(), description: description.into(), settings };
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vec![
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preset(
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DEFAULT_PRESET,
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"Keeps the document editable: VectorCraft reopens the PDF with nothing lost. For files you'll edit again.",
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PdfSettings { preserve_editing: true, ..Default::default() },
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),
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preset("High Quality Print", "For desktop printers and proofs: images stay at print resolution.", print(ImageCodec::Auto, false)),
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preset(
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"Press Quality",
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"For commercial printing: high-resolution images compressed losslessly, the document's bleed.",
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print(ImageCodec::Zip, true),
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),
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preset(
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"Smallest File Size",
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"For screens, email and the web: images resampled to 100 ppi and compressed.",
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PdfSettings {
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compatibility: Compatibility::Pdf16,
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fast_web_view: true,
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compression: compression(images(100.0, 150.0, ImageCodec::Jpeg, JpegQuality::Medium), 300.0),
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..Default::default()
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},
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),
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preset(
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"PDF/X-1a:2001",
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"Print exchange with CMYK and spot colours only: transparency flattened, fonts embedded.",
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pdf_x(Standard::PdfX1a, Compatibility::Pdf13),
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),
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preset(
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"PDF/X-3:2002",
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"Print exchange allowing colour-managed colours: transparency flattened, fonts embedded.",
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pdf_x(Standard::PdfX3, Compatibility::Pdf13),
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),
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preset(
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"PDF/X-4:2010",
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"Print exchange keeping live transparency and layers, colour-managed colours and embedded fonts.",
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pdf_x(Standard::PdfX4, Compatibility::Pdf16),
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),
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]
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}
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/// The built-in preset `name` names (any case; `default` is the app default).
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pub fn builtin_preset(name: &str) -> Option<PdfPreset> {
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let name = name.trim();
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let name = if name.eq_ignore_ascii_case("default") { DEFAULT_PRESET } else { name };
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builtin_presets().into_iter().find(|p| p.name.eq_ignore_ascii_case(name))
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}
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