From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Juri Linkov Newsgroups: gmane.emacs.devel Subject: Re: Multi image PDF continuous mode Date: Sat, 08 Jan 2022 20:17:30 +0200 Organization: LINKOV.NET Message-ID: <86o84m2ky5.fsf@mail.linkov.net> References: <86lf0tq5zy.fsf@mail.linkov.net> <87ilvxinbn.fsf@logand.com> <86pmq5lf2o.fsf@mail.linkov.net> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18898"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu) Cc: Tomas Hlavaty , Emacs Devel To: dalanicolai Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Jan 08 19:36:53 2022 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1n6GaC-0004gQ-T0 for ged-emacs-devel@m.gmane-mx.org; Sat, 08 Jan 2022 19:36:52 +0100 Original-Received: from localhost ([::1]:45182 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n6GaB-0005Bs-PX for ged-emacs-devel@m.gmane-mx.org; Sat, 08 Jan 2022 13:36:51 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:55382) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n6GX4-0000R2-S3 for emacs-devel@gnu.org; Sat, 08 Jan 2022 13:33:38 -0500 Original-Received: from relay6-d.mail.gandi.net ([217.70.183.198]:36665) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n6GWn-00062B-CS for emacs-devel@gnu.org; Sat, 08 Jan 2022 13:33:35 -0500 Original-Received: (Authenticated sender: juri@linkov.net) by relay6-d.mail.gandi.net (Postfix) with ESMTPSA id 13D4CC0008; Sat, 8 Jan 2022 18:33:12 +0000 (UTC) In-Reply-To: (dalanicolai@gmail.com's message of "Sat, 8 Jan 2022 08:11:50 +0100") Received-SPF: pass client-ip=217.70.183.198; envelope-from=juri@linkov.net; helo=relay6-d.mail.gandi.net X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:284485 Archived-At: > I would like to share my perspective on this, but before I do that, > let me first ask you if you have any idea about why pdf-tools is not part of > Emacs. It is a very high quality package, that already lazily loads the images, > and provides many sophisticated features. It would be nice to include pdf-tools in Emacs, but I don't know if the new maintainer has an intention to submit it for inclusion. > You might already be familiar with my 2-buffer continuous scroll hack for it > (which can be easily ported to doc-view mode, but 'developing' a 'real' > continuous scroll mode solution makes much more sense I agree, a real continuous scroll mode would be more preferable. > - I have created a, very rude but already nicely working, 'real' continuous > scroll proof of concept, for which, if you are interested, you can find the > code in this commit. It currently uses a trick where it only uses two images > at the time While two-images approach could provide better optimization for memory, it has severe limitations, e.g. the vertical scroll bar can't be used to scroll all images at once. > but as I will describe now, I think it will be better to create a > 'bookroll' package for it. This is a promising direction. > I think the bookroll should not be so difficult to implement (I first started to > think about a general 'image-roll', but I think continuous scrolling is > generally not what you want for viewing/scrolling images Why not? 'image-roll' could be useful for the image gallery packages like image-dired.el and thumbs.el. > So my current idea for how to implement it, is by > immediately creating overlays for all pages in a single buffer and fill them > with 'empty' svg-images of the correct size (after testing this with a thousand > 'placeholders', it seems that the 'empty' images use almost no memory). Good news, so loading a 1000-page document won't take much memory. Only scrolling will load real images. Maybe then after a real image will be scrolled out of view, it could be replaced with a placeholder again to free memory. > Then, the scrolling can be implemented, by changing the display properties (from empty > svg to real image, and back) and jumping to the correct positions using > `set-window-vscroll`. I have started on writing bookroll.el, of course your > joined efforts or feedback would be very much appreciated. Otherwise, this short > message serves just to inform you about these activities. Thanks, feel free to post updates about your progress or when stuck on some problems.