Export

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Exporting turns the deck on screen into one or more print-ready PDFs, and also exports the deck as a text list (Moxfield, Arena, MTGO, plain) or as a .pbdeck package. The PDF export is a long, parallel, cancellable background job with progress events that never leaves a half-written file under the final name.

Source: src-tauri/src/commands/export.rs (job), src-tauri/src/jobs.rs (ids and cancel flags), src/features/export/ (right panel, row alignment, presets, "more ways to export" menu), src/lib/trabajos.ts and src/stores/trabajo-store.ts (job plumbing on the screen), src-tauri/crates/proxy-core/src/decklist/exportar.rs (list text), src-tauri/src/fichero.rs and src-tauri/src/commands/fichero.rs (where a chosen path may be an Android content://, and sharing; see "Export on a phone" below). Settings live in PrintSettings (src-tauri/crates/proxy-core/src/model.rs).

Exporting

Public surface

Tauri commands (registered in src-tauri/src/lib.rs):

Command	Where	What it does
`export_pdf(deck, path, zip?) -> u32`	`commands/export.rs`	Starts the job in a blocking task and returns the `job_id` immediately. Progress on `export://progress`, result on `export://done`. `path` is a file path or, on Android, a `content://` URI; `zip: true` forces the pieces into a ZIP (see "Export on a phone").
`export_cancel(job_id) -> bool`	same	Sets the job's cancel flag (`Jobs::cancelar`); `false` if the job no longer exists.
`export_estimate(deck) -> ExportEstimate { bytes, images, pages, files, memory, lowMemory }`	same	Rough PDF size, how many PDFs will come out and the memory needed, before exporting (see below).
`card_export_image(card, back, settings, deck_back, path) -> String`	`commands/imagen.rs`	Saves one face of a card as an image (right-click → "Export image"): the same image the PDF would hold (retouches, edge darkening, designed cards painted by the engine) at the PDF quality's DPI and without bleed. The format comes from the extension (`png`, `jpg`, `webp`, `tif`, `bmp`; none → PNG; other → `InvalidInput`); on Android it comes from the name of the chosen `content://`, which Android supplies. The back is the card's own, the other face of a DFC, or the deck's.
`export_calibration(settings, path, texts) -> String`	same	Writes the duplex calibration sheet (Imaging and PDF); `path` may be a `content://`.
`export_open(path)`, `export_reveal(path)`	same	Open an exported file with the system viewer / show it in its folder. Only `.pdf` and `.pbdeck` files that exist are accepted (`exportado()`), otherwise `InvalidInput`. On Android `export_open` opens the file by sharing it (the system lets the user pick a viewer; `ACTION_VIEW` on a path does not work there) and `export_reveal` answers `Unsupported` (there is no folder to show).
`deck_list_text(deck, format) -> String`	`commands/decklist.rs`	The deck as list text for copying.
`deck_list_save(deck, format, path)`	same	Writes the list to a `.txt` (path must be absolute and end in `.txt`; a `content://` is written as is, since its name was chosen in the dialog).
`fichero_temporal(nombre) -> String`, `compartir_fichero(ruta)`	`commands/fichero.rs`	The Share path on a phone: a fresh file path inside the cache where the export is written, and the system share sheet for a file (a path or a `content://`). See "Export on a phone".
`deck_export_package(id, path) -> u64`	`commands/library.rs`	Saves the `.pbdeck` from the stored deck (Deck Package Format); `path` may be a `content://`.
`preset_list / preset_save / preset_delete`	`commands/library.rs`, `store/presets.rs`	Named print presets (see "Presets" below).

Events (types in src/bindings/, declared in src/lib/ipc.ts):

export://progress: ExportProgressEvent { jobId, phase: "prepare" | "compose" | "write", done, total }.
export://done: ExportDoneEvent { jobId, result: ExportResult | null, error: AppError | null }. ExportResult { paths, pages, sheets, bytes }.

End-to-end flow

sequenceDiagram
    participant UI as export-panel.tsx
    participant A as acciones.ts (exportarA)
    participant T as lanzarTrabajo
    participant R as export_pdf (Rust)
    participant J as exportar() worker
    UI->>A: pedirDestino (save dialog)
    UI->>R: export_estimate(deck)
    alt estimate > 500 MB
        UI->>UI: warning dialog (lower to JPEG 90 / 300 dpi / export anyway)
    end
    A->>T: lanzarTrabajo("export://progress","export://done", call export_pdf)
    T->>T: listen first, then launch
    T->>R: export_pdf(deck snapshot, path)
    R-->>T: job_id
    R->>J: spawn_blocking
    J-->>UI: export://progress (prepare n/total)
    J-->>UI: export://progress (compose page/total)
    J-->>UI: export://progress (write)
    J-->>T: export://done
    T-->>A: result or error
    A-->>UI: toast with Open / Show in folder

Screen side (`src/features/export/acciones.ts`)

pedirDestino asks where to save through guardarParaExportar from src/lib/dialogos.ts (which remembers the last export folder in Rust). Default name: nombreSeguro(deck.name, "pdf"), which replaces characters that filesystems reject and, if the deck still has the factory name ("Untitled deck" in any of the 15 languages, nombreVisible of src/lib/nombre-deck.ts), uses it in the current language, as on screen.
export-panel.tsx calls export_estimate; above AVISO_BYTES (500 MiB) or when the estimate says lowMemory (pideAviso in acciones.ts) it shows a dialog with three choices: "Lower to JPEG 90", "Lower to 300 dpi" (both change the deck's settings, then export) or "Export anyway".
exportarA(destino, t) reads the deck snapshot from the deck store and throws { code: "Busy" } if useTrabajo already has a job. It marks the job as started, then calls lanzarTrabajo.
On completion: a Cancelled error shows "Export cancelled"; any other error is thrown (the caller toasts mensaje(e)); success shows a toast with size, path, "Open" (export_open) and "Show in folder" (export_reveal).

Decision: the deck sent is the in-memory snapshot, not what is in the database. Why: autosave can lag by up to about 800 ms, and a user who changes a setting and exports immediately must get that setting.

lanzarTrabajo (src/lib/trabajos.ts): it subscribes to the progress and final events BEFORE invoking the command, buffers anything that arrives before the job_id is known, then replays it filtered by jobId. Why: a short job can finish before the invoke promise resolves; subscribing afterwards would lose the final event. useTrabajo (trabajo-store.ts) holds the single running job (tipo: "resolver" | "exportar", jobId, fase, hechas, total); the panel shows a spinner, "n/total", a Progress bar and a Cancel button (cancelarTrabajo in src/features/decklist/acciones.ts calls export_cancel for exports). Phase labels: FASES map (prepare, compose, write to "Preparing images...", "Composing pages...", "Writing the PDF...").

Rust side (`exportar`)

export_pdf registers a job (state.jobs.alta() -> (job_id, Arc<AtomicBool>)), marks the app busy with state.trabajo() (so e.g. the auto-updater will not restart mid-export, see Releases and Auto Updates), runs exportar(...) in tauri::async_runtime::spawn_blocking inside catch_unwind, always removes the job (jobs.baja) and emits export://done with either the result or the AppError (a panic becomes Internal { detalle: "pánico" }). Reason: without export://done the screen keeps showing the last progress forever and "Cancel" has nothing to stop.

exportar(state, deck, destino, cancelado, progreso) does:

Plan. plan(deck) (the same call the preview uses; Layout Engine).
Designs. DisenosDelDeck::de(state, deck) (src-tauri/src/diseno/pintar.rs) computes the effective design of each designed card (card > collection > factory) once per job.
Order form (encargo). For every occupied slot of every page, build a RenderSpec with render::spec_de_casilla. If the card has a design, DisenosDelDeck::referencia gives a DisenoRef { huella, cara, lang } (which face of the design this slot shows: the front, or face 1 of a designed double-faced card as back or as separate card; see cara_de_casilla), and the spec's edits and edge are cleared (designed cards get no retouches or edge darkening) and diseno is set. Specs are keyed by RenderSpec::key(), so identical slots (e.g. 4 copies of the same card, or the same back on every sheet) are rendered once. por_casilla maps (page, slot) to the key.
Prepare. A rayon pool of min(available_parallelism, 8) threads renders each distinct spec: render_para_pdf for ordinary images, or render_diseno_para_pdf for designed ones (pintar(...) with Salida::Impresion at the exact trim pixel size for the chosen dpi, then render_desde_imagen for bleed and encoding). Each task checks the cancel flag first (returns ErrorCode::Cancelled) and emits Prepare progress (done, total distinct images).
Images for krilla. Rendered bytes become krilla::image::Image (from_jpeg or from_png).
Compose and write, per output chunk (see splitting): compose(&sub_plan, &cutGuides, PdfMeta{title: deck.name, document_id: "<hash>-<chunk>"}, image_for_slot, page_done). page_done emits Compose progress and returns !cancelled. After a chunk is composed, Write progress is emitted and escribir_atomico writes it.

document_id comes from huella_documento: SHA-256 of the serialised plan plus the sorted slot-to-spec keys, first 16 bytes in hex. Same deck and settings give byte-identical PDFs.

Cancellation and atomic writes

Cancelling sets the shared AtomicBool; the prepare tasks and the per-page callback of compose observe it and the job returns PdfError::Cancelled / ErrorCode::Cancelled, which the screen treats as a normal "cancelled" outcome, not a failure.
escribir_atomico (src-tauri/src/store/blobs.rs) writes to <name>.<ext>.part, sync_all, then renames over the destination. A cancelled or failed export therefore never leaves a half-written file under the real name (test cancelar_no_toca_el_destino).
Gotcha: progress counters are not perfectly uniform. Prepare counts distinct images, Compose counts pages across all chunks, Write is the chunk index (t) over the chunk count, so it never reaches 100 % before done.

Splitting the PDF

PrintSettings.splitEvery (Option<u32>, UI "Split every N sheets"; empty means a single file). trozos(plan, n) groups pages by page.sheet / n, so the front and back of a sheet always stay in the same file. Output names: ruta_trozo keeps the chosen path when there is one file, otherwise <stem> (1).pdf, <stem> (2).pdf... next to it. ExportResult.paths lists every file written. Test partir_cada_dos_hojas. On Android the pieces go into one ZIP instead (below). A cancel after some chunks were written leaves those earlier chunks (each was written atomically); Inferred from the loop structure in exportar.

Estimate

export_estimate re-runs plan and encargo(.., None) (no design references, so designed cards are counted by their stored thumbnail blob) and multiplies pdf::estimate::bytes_por_imagen(...) by the number of distinct specs. It is an approximation, used only to warn. Test la_estimacion_cuenta_imagenes_distintas.

It also answers two things for phones. files is the number of PDFs that will come out (trozos(plan, splitEvery).len()), so the screen can ask for a ZIP instead of a PDF before the job starts. memory and lowMemory are the memory warning: memoria_necesaria adds all the encoded images (krilla keeps them whole until it writes) plus, per worker thread, the decoded card and its working copies (width x height x 4 x 3 bytes), and cabe_en_memoria says it does not fit when that exceeds 60 % of the free memory that sysinfo reports (memoria_libre; 0 means unknown and never warns). Why: on a phone with little memory Android kills the app in the middle of the export, with no error to show, so the warning comes first. It reuses the same dialog as the size warning, with an extra sentence. Tests la_memoria_necesaria_suma_las_imagenes_y_el_trabajo_de_cada_hilo and un_deck_de_100_cartas_a_600_ppp_en_png_no_cabe_en_2_gb_y_a_300_si.

Export on a phone (Android)

On Android the save dialog does not return a path but a content:// URI: a permission the system grants to that one file, with no folder next to it and no extension. Everything that exports goes through src-tauri/src/fichero.rs (IPC and Error Handling) and the desktop behaviour is unchanged (a path is a path).

Writing a PDF. exportar_en (commands/export.rs): when path is a URI (or zip is set) the PDF is composed into a temporary folder in the cache with fichero::temporal, and only then copied to the destination with fichero::copiar_a. Reason: a content:// cannot be renamed, so the atomic write of escribir_atomico (.part then rename) does not exist there. The result reports the URI as the only path.
Split PDFs and PNG go in a ZIP. With splitEvery set the export would write several files, and one cannot create files next to a content://. So the screen asks for a .zip (pedirDestino in acciones.ts calls saldraPartido, which reads files from export_estimate) and zip_de_trozos packs the pieces with fichero::zip_de_lista. The designer's PNG export does the same: Android has no folder picker, so elegirDestinoDeImagenes (src/lib/dialogos.ts) asks for a ZIP and png_en_zip (commands/diseno.rs) zips the es/, en/... folders with fichero::zip_de_carpeta. PDFs and images are already compressed, so they are stored as they are (Stored), not deflated.
Share. Next to "Save" the phone offers "Share" (in the "more ways" menu of menu-exportar.tsx: share the PDF, the list as text, the .pbdeck; and as the action of the "saved" toast, instead of "Open" and "Show in folder"). The screen asks fichero_temporal for a path in the cache, exports there (exportarA(..., { compartir: true, zip }), which skips the "saved" toast) and calls compartir_fichero. Rust copies a file that is not in the cache into it (para_compartir: the FileProvider of the Android project only sees the cache), works out the MIME type from the extension (mime_de) and asks the Android plugin for an ACTION_SEND (Rust App Layer). The copy stays in the cache until the next sweep: the other app reads it when it wants.
The panel on a phone is Deck's "Export" tab, so it drops its own "Export" heading (export-panel.tsx); everything else is the same panel.
Not on a phone. "Show in folder" (export_reveal) and "Open" with the system viewer do not exist; "Export image" writes to the chosen content:// like any other file.

The deck's factory print quality is still 600 dpi on a phone (the memory warning is the only protection). Inferred: whether a lower default for phones is wanted is still a product decision.

Settings panel (`src/features/export/export-panel.tsx`)

Every control writes to deck.settings through useDeck.setAjustes, so each change is saved with the deck, is undoable with Ctrl+Z and triggers a plan recompute (100 ms debounce, Layout Engine). Sections:

Section	Controls	Setting fields
PDF	Quality 300/600/900, image format JPEG/PNG, JPEG quality (60-100), split every N sheets	`quality`, `encoding {format, jpegQuality}`, `splitEvery`
Double-sided	Off / duplex, interleave DFC pairs, big-card back (only when the plan has a `bigGrid`), calibration sheet	`duplex`, `interleaveDfc`, `bigCardsBack`
Page	Paper, landscape, card size (63 x 88, 63.5 x 88.9 or 65 x 90 mm, with a help text about the last one), minimum margin	`paper`, `landscape`, `cardSize`, `minMarginMm`
Gap and bleed	Gap, bleed (0-5 mm), bleed fill (repeat edge / mirror), fill corners, bleed on backs	`gapMm`, `bleedMm`, `bleedMode`, `fillCorners`, `bleedOnBacks`
Cut guides	Draw guides, colour, width (px), offset from edge, length	`cutGuides {enabled, color, widthPx, offsetMm, lengthMm}`
Darken edges (collapsed)	Mode, amount, band width, auto-detect, apply to Scryfall / uploads / backs	`edgeDarkening`
Align rows (collapsed)	Front/back per-row X/Y offsets, measure-and-correct	`rowOffsets`
Print presets (collapsed)	Save/load named sets	all of `PrintSettings`

A footer note reminds the user to print at 100 % (no "fit to page") so the measurements come out exact.

Factory defaults and why (`impl Default for PrintSettings`)

Setting	Default	Rationale
paper / landscape	A4 / portrait	Common case.
cardSize	63 x 88 mm	Official size; the 63.5 x 88.9 option is the 2.5 x 3.5 in poker size, and 65 x 90 fills a sleeve (below).
minMarginMm	5	Typical unprintable border; the effective margin is `max(min, bleed)`.
gapMm	2	A white gap, as in the reference tool: each card keeps its exact size (fits sleeves) and bleed does not cover the gap.
bleedMm	0	Gap instead of bleed by default; bleed stays available.
bleedOnBacks	on	Backs match fronts when bleed is used.
fillCorners	off	Transparent corners print as paper colour; `corners::fill` only when the user turns it on.
cutGuides.enabled	off	Clean sheets by default; colour `#00c853`, 0.5 px, offset 0, length 5 mm when enabled.
edgeDarkening	disabled	Only for old scans; amount 80, band 8 %, auto-detect on, applies to Scryfall images only.
duplex	off	Most users print single-sided.
quality / encoding	600 dpi / JPEG 95	Print-quality default with sane size.
designLang	`En` (decks saved without it: `Es`)	Language designed cards are painted in (`DesignLang`). Any of the 15 languages; set from the "Language of designed cards" selector (`SelectorIdioma`, flag + native name) in the PDF section of the export panel (and the one in the Diseñar preview); a print preset never carries it. Changing it goes through `ponerIdiomaDiseno` (`src/features/disenar/renumerar.ts`): for a language other than Spanish and English it first runs `completarIdioma` (job `design_complete_lang`: downloads the Japanese/Korean/Chinese font if needed and the printing of every designed card missing that language), then re-renders the baked thumbnails of designed cards (`design_rerender`), since the sheet shows those. See Designer App Layer.

Test los_ajustes_por_defecto_son_los_de_fabricard in model.rs pins several of these.

Card sizes

The selector offers three CardSize constants of src-tauri/crates/proxy-core/src/model.rs (the panel's TAMANOS map, recognised back by widthMm):

Option	Constant	Use
63 x 88 mm	`CardSize::MTG` (default)	The size Wizards publishes.
63.5 x 88.9 mm	`CardSize::POKER`	2.5 x 3.5 in.
65 x 90 mm	`CardSize::FUNDA`	Fills a standard sleeve exactly.

Why 65 x 90: it is the same footprint as 63 x 88 printed with 1 mm of bleed, but the whole image is scaled to that size instead of having its edge repeated or mirrored, which is where bleed shows its artefacts (the repeated border of a scan, a mirrored stripe). The help text under the selector says so ("65 × 90 mm llena justa una funda: es como 1 mm de sangrado, pero con la imagen entera a ese tamaño en vez del borde repetido."). The image is stretched to the cell like any other (imaging::frame, see Imaging-and-PDF): the aspect ratio of 65 x 90 differs from 63 x 88 by under 1 %. Designed cards are rendered at that size from their design (the frame geometry is stretched by the same amount; see Designer-Engine).

How many fit, with the default 2 mm gap and 5 mm minimum margin (Layout-Engine):

A4 portrait: still 3 x 3 (test a4_vertical_a_la_medida_de_la_funda_siguen_siendo_3x3 in layout/grid.rs).
US Letter portrait: only 3 x 2, because three rows need 3 x 90 + 2 x gap + 2 x margin <= 279.4, that is margin + gap <= 4.7 mm. Lowering the minimum margin to 2.7 mm (with the 2 mm gap), or the gap to 0 with a margin up to 4.7 mm, gives 3 x 3 again, if the printer can print that close to the edge.

The PDF test la_carta_sale_en_el_pdf_con_su_tamano_en_milimetros (pdf/compose.rs) checks all three sizes, single- and double-sided.

Row alignment and the calibration sheet (`alinear-filas.tsx`)

AlinearFilas shows an X/Y table per row for "Front" and "Back" (range -20..20 mm, step 0.1). Back offsets are entered in the FRONT frame, indexed by front row; Rust applies them before mirroring (Layout Engine). "Correct with the measured values" opens a dialog where the user types the deviation read on the calibration sheet (right and down positive) per row; aplicar subtracts it from the existing back offsets (rounded to 2 decimals). "Reset" clears both lists. exportarCalibracion saves the sheet from export_calibration, passing translated title and four instruction lines (Rust writes no prose; see Internationalization).

Presets (`presets.tsx`)

Presets is a generic "load / save / delete" control over preset_list, preset_save, preset_delete, with PresetKind (deleting asks first, «¿Borrar el preset «{n}»?»): frontOffsets, backOffsets (JSON Offset[]) and print (JSON of the whole PrintSettings). They live in the local library DB (table presets, store/presets.rs), not in the deck, so they apply to any deck. Loading a print preset merges it over the current settings ({ ...actual, ...s }) after checking it has a paper field; a corrupt JSON shows "That preset is damaged". Gotcha: because it spreads, a preset saved by an older version lacks newer fields and keeps the current values for them.

Other export formats (`menu-exportar.tsx`)

With no real card in the deck (blank slots do not count) the "Export PDF" button is disabled and its tooltip says «El deck está vacío.»: there is nothing to print. The button is split: the three dots (MenuExportar) offer:

Item	Does
Copy: For Moxfield / For Arena / For MTGO / Plain text	`deck_list_text(deck, format)` then clipboard; empty result shows an info toast instead.
Download for MTGO (.txt)	Save dialog, then `deck_list_save(deck, "mtgo", path)`.
Deck with its images (.pbdeck)	`guardarAhora()` (flush autosave), save dialog, then `deck_export_package(id, path)`.

The list text is written by proxy_core::decklist::exportar (FormatoLista::{Moxfield, Arena, Mtgo, Texto}):

Source is the deck's cards (what prints), merging copies of the same printing (name + set + collector number) in order of appearance, not the pasted text.
Sections (commander, companion, sideboard) are not stored per card, so they are recovered by re-parsing deck.decklistText and matching by name (also by front-face name for double-faced cards).
Tokens (by source or by type line), blank slots and custom cards linked to an external token source are omitted.
Marks: cuentan(&deck.cards) drops optional cards and extra design variants; sideboard-marked cards go to the sideboard. See Statistics for the cuentan rule.
Formats: Moxfield 1 Sol Ring (CMM) 410 with SIDEBOARD:; Arena with Commander / Companion / Deck / Sideboard headers and front-face names; MTGO 1 Name with the commander and sideboard after a blank line; plain 1 Name.

Failure modes

Situation	Behaviour
Card does not fit paper / invalid settings	`plan` fails: `AppError InvalidInput` with `motivo`.
Blob missing	`ErrorCode::NotFound` from `leer_blob`.
Bad image	`ErrorCode::Image` (`motivo=too_large` or `detalle`).
PDF write error	`ErrorCode::Pdf` with `detalle`.
Cancel	`ErrorCode::Cancelled`, treated by the UI as "Export cancelled".
Another job running	UI throws `Busy` before calling Rust.
Phone with little free memory	Not a failure: the size dialog adds a sentence (`lowMemory`) and the person decides.
Chosen `content://` cannot be opened or written	`ErrorCode::Io` with `detalle` (`io_uri` logs it).
"Show in folder" on Android	`ErrorCode::Unsupported` (`detalle: content`).
Design lost between planning and render	`ErrorCode::Internal` ("diseno perdido").

Tests

Rust: src-tauri/src/commands/export.rs tests (exportar_veinte_cartas_en_duplex, exportar_cartas_disenadas, una_dfc_disenada_sale_con_cada_cara_en_su_sitio, un_plano_disenado_sale_grande_en_su_hoja, cancelar_no_toca_el_destino, partir_cada_dos_hojas, la_estimacion_cuenta_imagenes_distintas, la_hoja_de_calibracion_se_escribe, and an end-to-end test), src-tauri/crates/proxy-core/src/decklist/exportar.rs tests, src-tauri/src/jobs.rs; for the phone, los_trozos_de_un_pdf_partido_van_en_un_zip and the memory tests in commands/export.rs, and the Acceso fakes in fichero.rs.
Frontend: src/features/export/__tests__/acciones.test.ts (mocked event bus).

Where to start when extending

New print option: add the field to PrintSettings (with #[serde(default)] if old decks must still open), regenerate bindings, add a control in export-panel.tsx, use it in layout::plan or render::spec_de_casilla, and add the label to src/i18n/en/.
New list format: add a FormatoLista variant and a branch in exportar(), then an entry in COPIAR in menu-exportar.tsx.

Export

Export

Public surface

End-to-end flow

Screen side (src/features/export/acciones.ts)

Rust side (exportar)

Cancellation and atomic writes

Splitting the PDF

Estimate

Export on a phone (Android)

Settings panel (src/features/export/export-panel.tsx)

Factory defaults and why (impl Default for PrintSettings)

Card sizes

Row alignment and the calibration sheet (alinear-filas.tsx)

Presets (presets.tsx)

Other export formats (menu-exportar.tsx)

Failure modes

Tests

Where to start when extending

See also

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Screen side (`src/features/export/acciones.ts`)

Rust side (`exportar`)

Settings panel (`src/features/export/export-panel.tsx`)

Factory defaults and why (`impl Default for PrintSettings`)

Row alignment and the calibration sheet (`alinear-filas.tsx`)

Presets (`presets.tsx`)

Other export formats (`menu-exportar.tsx`)