From ffde82c9ecf99524220e463055f4f18c8c9e7a81 Mon Sep 17 00:00:00 2001 From: Ludovic Courtès Date: Tue, 25 Oct 2016 00:58:26 +0200 Subject: system: grub: Use Guile-{RSVG,Cairo} instead of Inkscape + ImageMagick. Based on a suggestion by Andy Wingo at . * gnu/build/svg.scm: New file. * gnu/local.mk (GNU_SYSTEM_MODULES): Add it. * gnu/system/grub.scm (svg->png): Add #:width and #:height. Rewrite to use (gnu build svg). (resize-image): Remove. (grub-background-image): Adjust accordingly. --- gnu/build/svg.scm | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 gnu/build/svg.scm (limited to 'gnu/build/svg.scm') diff --git a/gnu/build/svg.scm b/gnu/build/svg.scm new file mode 100644 index 0000000000..d9b909cd73 --- /dev/null +++ b/gnu/build/svg.scm @@ -0,0 +1,69 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2016 Ludovic Courtès +;;; Copyright © 2015 Andy Wingo +;;; +;;; This file is part of GNU Guix. +;;; +;;; GNU Guix is free software; you can redistribute it and/or modify it +;;; under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 3 of the License, or (at +;;; your option) any later version. +;;; +;;; GNU Guix is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with GNU Guix. If not, see . + +(define-module (gnu build svg) + #:use-module (srfi srfi-11) + #:export (svg->png)) + +;; We need Guile-RSVG and Guile-Cairo. Load them lazily, at run time, to +;; allow compilation to proceed. +(module-use! (current-module) (resolve-interface '(rsvg))) +(module-use! (current-module) (resolve-interface '(cairo))) + +(define* (downscaled-surface surface + #:key + source-width source-height + width height) + "Return a new rendering context where SURFACE is scaled to WIDTH x HEIGHT." + (let ((cr (cairo-create (cairo-image-surface-create 'argb32 + width height)))) + (cairo-scale cr (/ width source-width) (/ height source-height)) + (cairo-set-source-surface cr surface 0 0) + (cairo-pattern-set-filter (cairo-get-source cr) 'best) + (cairo-rectangle cr 0 0 source-width source-height) + (cairo-fill cr) + cr)) + +(define* (svg->png in-svg out-png + #:key width height) + "Render the file at IN-SVG as a PNG file in OUT-PNG. When WIDTH and HEIGHT +are provided, use them as the dimensions of OUT-PNG; otherwise preserve the +dimensions of IN-SVG." + (define svg + (rsvg-handle-new-from-file in-svg)) + + (let-values (((origin-width origin-height) + (rsvg-handle-get-dimensions svg))) + (let* ((surf (cairo-image-surface-create 'argb32 + origin-width origin-height)) + (cr (cairo-create surf))) + (rsvg-handle-render-cairo svg cr) + (cairo-surface-flush surf) + (let ((cr (if (and width height + (not (= width origin-width)) + (not (= height origin-height))) + (downscaled-surface surf + #:source-width origin-width + #:source-height origin-height + #:width width + #:height height) + cr))) + (cairo-surface-write-to-png (cairo-get-target cr) out-png))))) + +;;; svg.scm ends here -- cgit 1.4.1