thomas.koppandClaude Opus 5
de59a5a904
preview/ holds a yazi.toml and a pdf-hidpi plugin that fix unreadable PDF previews. Yazi calls pdftoppm without -r (150 DPI) and then caps the image at 600x900, so pages are downscaled and upscaled again; the plugin renders at 300 DPI as PNG and the cap goes to 1600x2400, turning that into supersampling. Previewer and preloader both have to be overridden — they share the cache file. README documents this plus what video previews can and cannot do: the preview is a single ffmpeg keyframe by design, J/K scrubs it, and the opener offers mpv --vo=kitty with shared-memory transfer for inline playback. Targets the 26.9 plugin API (fs.cha, not main's fs.stat). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
74 lines
2.0 KiB
Lua
74 lines
2.0 KiB
Lua
-- pdf-hidpi: like Yazi's built-in `pdf` previewer, but renders at a higher
|
|
-- resolution and as PNG instead of JPEG.
|
|
--
|
|
-- The built-in one calls `pdftoppm` without `-r`, so pages come out at
|
|
-- poppler's 150 DPI default (A4 = 1240x1754) and are then JPEG-compressed.
|
|
-- On a large or a portrait pane that is not enough pixels for body text, and
|
|
-- JPEG ringing around glyphs makes it worse.
|
|
--
|
|
-- Rendering above the target size and letting `image_precache` downscale gives
|
|
-- a supersampled, much sharper result. PNG keeps glyph edges clean.
|
|
--
|
|
-- Raise DPI for even sharper text at the cost of render time and cache size.
|
|
|
|
local DPI = 300
|
|
|
|
local M = {}
|
|
|
|
function M:peek(job)
|
|
local start, cache = os.clock(), ya.file_cache(job)
|
|
if not cache then
|
|
return
|
|
end
|
|
|
|
local ok, err, bound = self:preload(job)
|
|
if bound and bound > 0 then
|
|
return ya.emit("peek", { bound - 1, only_if = job.file.url, upper_bound = true })
|
|
elseif not ok or err then
|
|
return ya.preview_widget(job, err)
|
|
end
|
|
|
|
ya.sleep(math.max(0, rt.preview.image_delay / 1000 + start - os.clock()))
|
|
|
|
local _, err = ya.image_show(cache, job.area)
|
|
ya.preview_widget(job, err)
|
|
end
|
|
|
|
function M:seek(job)
|
|
local h = cx.active.current.hovered
|
|
if h and h.url == job.file.url then
|
|
local step = ya.clamp(-1, job.units, 1)
|
|
ya.emit("peek", { math.max(0, cx.active.preview.skip + step), only_if = job.file.url })
|
|
end
|
|
end
|
|
|
|
function M:preload(job)
|
|
local cache = ya.file_cache(job)
|
|
if not cache or fs.cha(cache) then
|
|
return true
|
|
end
|
|
|
|
-- stylua: ignore
|
|
local output, err = Command("pdftoppm")
|
|
:arg({
|
|
"-f", job.skip + 1,
|
|
"-l", job.skip + 1,
|
|
"-singlefile",
|
|
"-r", DPI,
|
|
"-png",
|
|
tostring(job.file.path), tostring(cache),
|
|
})
|
|
:output()
|
|
|
|
if not output then
|
|
return true, Err("Failed to start `pdftoppm`, error: %s", err)
|
|
elseif not output.status.success then
|
|
local pages = job.skip > 0 and tonumber(output.stderr:match("the last page %((%d+)%)"))
|
|
return true, Err("Failed to convert PDF to image, stderr: %s", output.stderr), pages
|
|
end
|
|
|
|
return ya.image_precache(Url(cache .. ".png"), cache)
|
|
end
|
|
|
|
return M
|