The page shown was drawn through a fresh renderer each time, which parsed
the whole unmarked document on the UI thread; UnmarkedPages now parses it
once and keeps it. An error from rendering a page ahead (the pool retiring
its parser, a cancelled request) no longer marks that page failed: only
drawing it when shown decides, and a page that has a picture keeps it. On
the web, where the pool renders on the UI thread, nothing renders ahead.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The preview showed the page's thumbnail, old marks and all, until the
unmarked page rendered, and one page that failed to render switched the
unmarked preview off for every page. The page shown is now drawn from the
unmarked document straight away at the preview's size; the pages a step
goes to render ahead off the UI thread; a page that fails falls back to
its own thumbnail while the others keep theirs.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The preview cloned and wrote the whole document on the UI thread for every
page it stepped to, and showed a blank sheet while the page rendered.
Document::without_marks now removes the marks of a kind from every page
once per dialog (UnmarkedPages), each page shown renders from it off the
UI thread, and the page's thumbnail stays until it arrives.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
main split lib.rs: the unmarked_page field stays on PdfCraftApp in lib.rs,
its init and the render_pending check moved to app.rs.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Export > Image spent its time in the PNG, JPEG and TIFF encoders, one
page after another: on a 55-page manual at 150 dpi, drawing every page
took about 0.34 s and encoding it 1.1 s (PNG) to 2.0 s (JPEG).
Exporter::images exports a list of pages, drawing and encoding several
at once on worker threads, each with its own PageRenderer (as
automation's extract_parallel does), and hands the files to a sink in
page order on the calling thread. Workers draw at most one page ahead
of the sink and fewer run when 1 GiB can't hold that many of the
largest page. The first page or sink error stops the export with every
earlier page handed over, as before. A page panic becomes that page's
error, and a panicking sink stops the workers. One page, one core or
wasm keeps the per-page loop. Export > Image and the doc_export_images
tool use it.
Files are byte-identical. One core is left for the interface (at most
8 workers). With examples/export_bench, on a Ryzen with 16 threads
(shared), mean of two medians of 21 runs:
PNG 150 dpi 1874 -> 340 ms (-82%)
JPEG 150 dpi 2106 -> 340 ms (-84%)
TIFF 150 dpi 2032 -> 375 ms (-82%)
PNG 300 dpi 3804 -> 590 ms (-84%)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
