Daniele
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On iOS the file viewer showed only the first page of a PDF, with no way to scroll to the rest — the document had to be downloaded and opened in another app. The cause was not ours: WebKit refuses to mount its PDF viewer inside an <iframe>/<object>/<embed> and paints a static first-page thumbnail instead. That hits Safari on iOS and every WKWebView, so the native shell too. The full viewer only exists for a top-level navigation. The desktop browsers do mount a viewer, but each mounts its own — Chrome's toolbar, Safari's page-index sidebar — so the same document also looked different on every machine. Both are answered by drawing the pages ourselves. New <pdf-view> (web/components/shared/pdf-view.js) renders a continuous scroll of canvas pages on the vendored pdf.js, with a zoom control and a page counter, and replaces the iframe for both native .pdf files and server-compiled LaTeX. Three properties are load-bearing: - pdf.js is imported lazily (~450 KB + a 1.2 MB worker), so a session that never opens a PDF never pays for it. - Canvases are created and destroyed as pages scroll. iOS caps the total canvas backing store a page may hold and silently blanks canvases past it, so an eager render would come out empty on exactly the platform this was written for. Off-screen pages keep only a correctly-sized box, which is also what keeps the scrollbar honest. - The text layer (selection, in-page find) is best-effort: it is transparent DOM over the pixels, so its failures are swallowed rather than surfaced. Vendored from pdfjs-dist 6.2.108: pdf.min.mjs, pdf.worker.min.mjs, the standard-font data (needed by PDFs that reference Helvetica/Times without embedding them) and the .textLayer block of pdf_viewer.css. CJK cmaps are deliberately left out. pdf.js 6 needs Safari/iOS 17.4+. Verified in headless Chromium against both a synthetic 12-page PDF using non-embedded Helvetica and a real 14-page paper with embedded fonts and figures: all pages present, last page renders after scrolling, page 1 released off-screen, text layer populated, zoom re-renders at the new scale, no JS errors.
103 lines
4.3 KiB
Plaintext
103 lines
4.3 KiB
Plaintext
Digitized data copyright (c) 2010 Google Corporation
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with Reserved Font Arimo, Tinos and Cousine.
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Copyright (c) 2012 Red Hat, Inc.
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with Reserved Font Name Liberation.
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This Font Software is licensed under the SIL Open Font License,
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Version 1.1.
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This license is copied below, and is also available with a FAQ at:
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http://scripts.sil.org/OFL
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SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
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PREAMBLE The goals of the Open Font License (OFL) are to stimulate
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worldwide development of collaborative font projects, to support the font
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creation efforts of academic and linguistic communities, and to provide
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a free and open framework in which fonts may be shared and improved in
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partnership with others.
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The OFL allows the licensed fonts to be used, studied, modified and
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redistributed freely as long as they are not sold by themselves.
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The fonts, including any derivative works, can be bundled, embedded,
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redistributed and/or sold with any software provided that any reserved
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names are not used by derivative works. The fonts and derivatives,
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however, cannot be released under any other type of license. The
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requirement for fonts to remain under this license does not apply to
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any document created using the fonts or their derivatives.
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DEFINITIONS
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"Font Software" refers to the set of files released by the Copyright
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Holder(s) under this license and clearly marked as such.
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This may include source files, build scripts and documentation.
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"Reserved Font Name" refers to any names specified as such after the
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copyright statement(s).
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"Original Version" refers to the collection of Font Software components
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as distributed by the Copyright Holder(s).
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"Modified Version" refers to any derivative made by adding to, deleting,
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or substituting ? in part or in whole ?
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any of the components of the Original Version, by changing formats or
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by porting the Font Software to a new environment.
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"Author" refers to any designer, engineer, programmer, technical writer
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or other person who contributed to the Font Software.
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PERMISSION & CONDITIONS
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of the Font Software, to use, study, copy, merge, embed, modify,
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redistribute, and sell modified and unmodified copies of the Font
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Software, subject to the following conditions:
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1) Neither the Font Software nor any of its individual components,in
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Original or Modified Versions, may be sold by itself.
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2) Original or Modified Versions of the Font Software may be bundled,
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redistributed and/or sold with any software, provided that each copy
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contains the above copyright notice and this license. These can be
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included either as stand-alone text files, human-readable headers or
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in the appropriate machine-readable metadata fields within text or
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binary files as long as those fields can be easily viewed by the user.
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3) No Modified Version of the Font Software may use the Reserved Font
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Name(s) unless explicit written permission is granted by the
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corresponding Copyright Holder. This restriction only applies to the
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primary font name as presented to the users.
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4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
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Software shall not be used to promote, endorse or advertise any
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Modified Version, except to acknowledge the contribution(s) of the
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Copyright Holder(s) and the Author(s) or with their explicit written
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permission.
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5) The Font Software, modified or unmodified, in part or in whole, must
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be distributed entirely under this license, and must not be distributed
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under any other license. The requirement for fonts to remain under
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this license does not apply to any document created using the Font
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Software.
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TERMINATION
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This license becomes null and void if any of the above conditions are not met.
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DISCLAIMER
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THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
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OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
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COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
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DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER
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DEALINGS IN THE FONT SOFTWARE.
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