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456 Zeilen
16 KiB
456 Zeilen
16 KiB
;;; pdf-cache.el --- Cache time-critical or frequent epdfinfo queries. -*- lexical-binding:t -*-
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;; Copyright (C) 2013 Andreas Politz
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;; Author: Andreas Politz <politza@fh-trier.de>
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;; Keywords: files, doc-view, pdf
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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;;
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(require 'pdf-info)
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(require 'pdf-util)
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;; * ================================================================== *
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;; * Customiazations
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;; * ================================================================== *
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(defcustom pdf-cache-image-limit 64
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"Maximum number of cached PNG images per buffer."
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:type 'integer
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:group 'pdf-cache
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:group 'pdf-view)
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(defcustom pdf-cache-prefetch-delay 0.5
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"Idle time in seconds before prefetching images starts."
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:group 'pdf-view
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:type 'number)
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(defcustom pdf-cache-prefetch-pages-function
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'pdf-cache-prefetch-pages-function-default
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"A function returning a list of pages to be prefetched.
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It is called with no arguments in the PDF window and should
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return a list of page-numbers, determining the pages that should
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be prefetched and their order."
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:group 'pdf-view
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:type 'function)
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;; * ================================================================== *
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;; * Simple Value cache
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;; * ================================================================== *
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(defvar-local pdf-cache--data nil)
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(defvar pdf-annot-modified-functions)
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(defun pdf-cache--initialize ()
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(unless pdf-cache--data
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(setq pdf-cache--data (make-hash-table))
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(add-hook 'pdf-info-close-document-hook 'pdf-cache-clear-data nil t)
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(add-hook 'pdf-annot-modified-functions
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'pdf-cache--clear-data-of-annotations
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nil t)))
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(defun pdf-cache--clear-data-of-annotations (fn)
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(apply 'pdf-cache-clear-data-of-pages
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(mapcar (lambda (a)
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(cdr (assq 'page a)))
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(funcall fn t))))
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(defun pdf-cache--data-put (key value &optional page)
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"Put KEY with VALUE in the cache of PAGE, return value."
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(pdf-cache--initialize)
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(puthash page (cons (cons key value)
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(assq-delete-all
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key
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(gethash page pdf-cache--data)))
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pdf-cache--data)
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value)
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(defun pdf-cache--data-get (key &optional page)
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"Get value of KEY in the cache of PAGE.
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Returns a cons \(HIT . VALUE\), where HIT is non-nil if KEY was
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stored previously for PAGE and VALUE it's value. Otherwise HIT
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is nil and VALUE undefined."
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(pdf-cache--initialize)
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(let ((elt (assq key (gethash page pdf-cache--data))))
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(if elt
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(cons t (cdr elt))
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(cons nil nil))))
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(defun pdf-cache--data-clear (key &optional page)
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(pdf-cache--initialize)
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(puthash page
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(assq-delete-all key (gethash page pdf-cache--data))
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pdf-cache--data)
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nil)
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(defun pdf-cache-clear-data-of-pages (&rest pages)
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(when pdf-cache--data
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(dolist (page pages)
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(remhash page pdf-cache--data))))
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(defun pdf-cache-clear-data ()
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(interactive)
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(when pdf-cache--data
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(clrhash pdf-cache--data)))
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(defmacro define-pdf-cache-function (command &optional page-arg-p)
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"Define a simple data cache function.
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COMMAND is the name of the command, e.g. number-of-pages. It
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should have a corresponding pdf-info function. If PAGE-ARG-P is
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non-nil, define a one-dimensional cache indexed by the page
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number. Otherwise the value is constant for each document, like
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e.g. number-of-pages.
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Both args are unevaluated."
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(let ((args (if page-arg-p (list 'page)))
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(fn (intern (format "pdf-cache-%s" command)))
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(ifn (intern (format "pdf-info-%s" command)))
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(doc (format "Cached version of `pdf-info-%s', which see.
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Make sure, not to modify it's return value." command)))
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`(defun ,fn ,args
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,doc
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(let ((hit-value (pdf-cache--data-get ',command ,(if page-arg-p 'page))))
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(if (car hit-value)
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(cdr hit-value)
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(pdf-cache--data-put
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',command
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,(if page-arg-p
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(list ifn 'page)
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(list ifn))
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,(if page-arg-p 'page)))))))
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(define-pdf-cache-function pagelinks t)
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(define-pdf-cache-function number-of-pages)
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;; The boundingbox may change if annotations change.
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(define-pdf-cache-function boundingbox t)
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(define-pdf-cache-function textregions t)
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(define-pdf-cache-function pagesize t)
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;; * ================================================================== *
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;; * PNG image LRU cache
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;; * ================================================================== *
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(defvar pdf-cache-image-inihibit nil
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"Non-nil, if the image cache should be bypassed.")
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(defvar-local pdf-cache--image-cache nil)
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(defmacro pdf-cache--make-image (page width data hash)
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`(list ,page ,width ,data ,hash))
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(defmacro pdf-cache--image/page (img) `(nth 0 ,img))
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(defmacro pdf-cache--image/width (img) `(nth 1 ,img))
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(defmacro pdf-cache--image/data (img) `(nth 2 ,img))
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(defmacro pdf-cache--image/hash (img) `(nth 3 ,img))
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(defun pdf-cache--image-match (image page min-width &optional max-width hash)
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"Match IMAGE with specs.
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IMAGE should be a list as created by `pdf-cache--make-image'.
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Return non-nil, if IMAGE's page is the same as PAGE, it's width
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is at least MIN-WIDTH and at most MAX-WIDTH and it's stored
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hash-value is `eql' to HASH."
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(and (= (pdf-cache--image/page image)
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page)
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(or (null min-width)
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(>= (pdf-cache--image/width image)
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min-width))
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(or (null max-width)
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(<= (pdf-cache--image/width image)
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max-width))
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(eql (pdf-cache--image/hash image)
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hash)))
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(defun pdf-cache-lookup-image (page min-width &optional max-width hash)
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"Return PAGE's cached PNG data as a string or nil.
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Does not modify the cache. See also `pdf-cache-get-image'."
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(let ((image (car (cl-member
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(list page min-width max-width hash)
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pdf-cache--image-cache
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:test (lambda (spec image)
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(apply 'pdf-cache--image-match image spec))))))
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(and image
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(pdf-cache--image/data image))))
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(defun pdf-cache-get-image (page min-width &optional max-width hash)
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"Return PAGE's PNG data as a string.
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Return an image of at least MIN-WIDTH and, if non-nil, maximum
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width MAX-WIDTH and `eql' hash value.
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Remember that image was recently used.
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Returns nil, if no matching image was found."
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(let ((cache pdf-cache--image-cache)
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image)
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;; Find it in the cache.
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(while (and (setq image (pop cache))
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(not (pdf-cache--image-match
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image page min-width max-width hash))))
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;; Remove it and push it to the front.
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(when image
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(setq pdf-cache--image-cache
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(cons image (delq image pdf-cache--image-cache)))
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(pdf-cache--image/data image))))
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(defun pdf-cache-put-image (page width data &optional hash)
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"Cache image of PAGE with WIDTH, DATA and HASH.
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DATA should the string of a PNG image of width WIDTH and from
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page PAGE in the current buffer. See `pdf-cache-get-image' for
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the HASH argument.
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This function always returns nil."
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(unless pdf-cache--image-cache
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(add-hook 'pdf-info-close-document-hook 'pdf-cache-clear-images nil t)
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(add-hook 'pdf-annot-modified-functions
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'pdf-cache--clear-images-of-annotations nil t))
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(push (pdf-cache--make-image page width data hash)
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pdf-cache--image-cache)
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;; Forget old image(s).
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(when (> (length pdf-cache--image-cache)
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pdf-cache-image-limit)
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(if (> pdf-cache-image-limit 1)
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(setcdr (nthcdr (1- pdf-cache-image-limit)
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pdf-cache--image-cache)
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nil)
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(setq pdf-cache--image-cache nil)))
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nil)
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(defun pdf-cache-clear-images ()
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"Clear the image cache."
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(setq pdf-cache--image-cache nil))
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(defun pdf-cache-clear-images-if (fn)
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"Remove images from the cache according to FN.
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FN should be function accepting 4 Arguments \(PAGE WIDTH DATA
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HASH\). It should return non-nil, if the image should be removed
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from the cache."
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(setq pdf-cache--image-cache
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(cl-remove-if
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(lambda (image)
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(funcall
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fn
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(pdf-cache--image/page image)
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(pdf-cache--image/width image)
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(pdf-cache--image/data image)
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(pdf-cache--image/hash image)))
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pdf-cache--image-cache)))
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(defun pdf-cache--clear-images-of-annotations (fn)
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(apply 'pdf-cache-clear-images-of-pages
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(mapcar (lambda (a)
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(cdr (assq 'page a)))
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(funcall fn t))))
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(defun pdf-cache-clear-images-of-pages (&rest pages)
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(pdf-cache-clear-images-if
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(lambda (page &rest _) (memq page pages))))
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(defun pdf-cache-renderpage (page min-width &optional max-width)
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"Render PAGE according to MIN-WIDTH and MAX-WIDTH.
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Return the PNG data of an image as a string, such that it's width
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is at least MIN-WIDTH and, if non-nil, at most MAX-WIDTH.
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If such an image is not available in the cache, call
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`pdf-info-renderpage' to create one."
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(if pdf-cache-image-inihibit
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(pdf-info-renderpage page min-width)
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(or (pdf-cache-get-image page min-width max-width)
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(let ((data (pdf-info-renderpage page min-width)))
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(pdf-cache-put-image page min-width data)
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data))))
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(defun pdf-cache-renderpage-text-regions (page width single-line-p
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&rest selection)
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"Render PAGE according to WIDTH, SINGLE-LINE-P and SELECTION.
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See also `pdf-info-renderpage-text-regions' and
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`pdf-cache-renderpage'."
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(if pdf-cache-image-inihibit
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(apply 'pdf-info-renderpage-text-regions
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page width single-line-p nil selection)
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(let ((hash (sxhash
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(format "%S" (cons 'renderpage-text-regions
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(cons single-line-p selection))))))
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(or (pdf-cache-get-image page width width hash)
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(let ((data (apply 'pdf-info-renderpage-text-regions
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page width single-line-p nil selection)))
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(pdf-cache-put-image page width data hash)
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data)))))
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(defun pdf-cache-renderpage-highlight (page width &rest regions)
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"Highlight PAGE according to WIDTH and REGIONS.
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See also `pdf-info-renderpage-highlight' and
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`pdf-cache-renderpage'."
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(if pdf-cache-image-inihibit
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(apply 'pdf-info-renderpage-highlight
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page width nil regions)
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(let ((hash (sxhash
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(format "%S" (cons 'renderpage-highlight
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regions)))))
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(or (pdf-cache-get-image page width width hash)
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(let ((data (apply 'pdf-info-renderpage-highlight
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page width nil regions)))
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(pdf-cache-put-image page width data hash)
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data)))))
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;; * ================================================================== *
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;; * Prefetching images
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;; * ================================================================== *
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(defvar-local pdf-cache--prefetch-pages nil
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"Pages to be prefetched.")
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(defvar-local pdf-cache--prefetch-timer nil
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"Timer used when prefetching images.")
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(define-minor-mode pdf-cache-prefetch-minor-mode
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"Try to load images which will probably be needed in a while."
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nil nil nil
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(pdf-cache--prefetch-cancel)
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(cond
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(pdf-cache-prefetch-minor-mode
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(pdf-util-assert-pdf-buffer)
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(add-hook 'pre-command-hook 'pdf-cache--prefetch-stop nil t)
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;; FIXME: Disable the time when the buffer is killed or it's
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;; major-mode changes.
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(setq pdf-cache--prefetch-timer
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(run-with-idle-timer (or pdf-cache-prefetch-delay 1)
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t 'pdf-cache--prefetch-start (current-buffer))))
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(t
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(remove-hook 'pre-command-hook 'pdf-cache--prefetch-stop t))))
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(defun pdf-cache-prefetch-pages-function-default ()
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(let ((page (pdf-view-current-page)))
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(pdf-util-remove-duplicates
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(cl-remove-if-not
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(lambda (page)
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(and (>= page 1)
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(<= page (pdf-cache-number-of-pages))))
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(append
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;; +1, -1, +2, -2, ...
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(let ((sign 1)
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(incr 1))
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(mapcar (lambda (_)
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(setq page (+ page (* sign incr))
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sign (- sign)
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incr (1+ incr))
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page)
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(number-sequence 1 16)))
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;; First and last
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(list 1 (pdf-cache-number-of-pages))
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;; Links
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(mapcar
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(apply-partially 'alist-get 'page)
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(cl-remove-if-not
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(lambda (link) (eq (alist-get 'type link) 'goto-dest))
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(pdf-cache-pagelinks
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(pdf-view-current-page)))))))))
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(defun pdf-cache--prefetch-pages (window image-width)
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(when (and (eq window (selected-window))
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(pdf-util-pdf-buffer-p))
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(let ((page (pop pdf-cache--prefetch-pages)))
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(while (and page
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(pdf-cache-lookup-image
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page
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image-width
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(if (not (pdf-view-use-scaling-p))
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image-width
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(* 2 image-width))))
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(setq page (pop pdf-cache--prefetch-pages)))
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(pdf-util-debug
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(when (null page)
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(message "Prefetching done.")))
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(when page
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(let* ((buffer (current-buffer))
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(pdf-info-asynchronous
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(lambda (status data)
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(when (and (null status)
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(eq window
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(selected-window))
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(eq buffer (window-buffer)))
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(with-current-buffer (window-buffer)
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(when (derived-mode-p 'pdf-view-mode)
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(pdf-cache-put-image
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page image-width data)
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(image-size (pdf-view-create-page page))
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(pdf-util-debug
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(message "Prefetched page %s." page))
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;; Avoid max-lisp-eval-depth
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(run-with-timer
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0.001 nil 'pdf-cache--prefetch-pages window image-width)))))))
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(condition-case err
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(pdf-info-renderpage page image-width)
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(error
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(pdf-cache-prefetch-minor-mode -1)
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(signal (car err) (cdr err)))))))))
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(defvar pdf-cache--prefetch-started-p nil
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"Guard against multiple prefetch starts.
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Used solely in `pdf-cache--prefetch-start'.")
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(defun pdf-cache--prefetch-start (buffer)
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"Start prefetching images in BUFFER."
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(when (and pdf-cache-prefetch-minor-mode
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(not pdf-cache--prefetch-started-p)
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(pdf-util-pdf-buffer-p)
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(not isearch-mode)
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(null pdf-cache--prefetch-pages)
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(eq (window-buffer) buffer)
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(fboundp pdf-cache-prefetch-pages-function))
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(let* ((pdf-cache--prefetch-started-p t)
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(pages (funcall pdf-cache-prefetch-pages-function)))
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(setq pdf-cache--prefetch-pages
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(butlast pages (max 0 (- (length pages)
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pdf-cache-image-limit))))
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(pdf-cache--prefetch-pages
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(selected-window)
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(car (pdf-view-desired-image-size))))))
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(defun pdf-cache--prefetch-stop ()
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"Stop prefetching images in current buffer."
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(setq pdf-cache--prefetch-pages nil))
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(defun pdf-cache--prefetch-cancel ()
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"Cancel prefetching images in current buffer."
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(pdf-cache--prefetch-stop)
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(when pdf-cache--prefetch-timer
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(cancel-timer pdf-cache--prefetch-timer))
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(setq pdf-cache--prefetch-timer nil))
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(provide 'pdf-cache)
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;;; pdf-cache.el ends here
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