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system: grub: Use Guile-{RSVG,Cairo} instead of Inkscape + ImageMagick. 

Based on a suggestion by Andy Wingo at
<https://lists.gnu.org/archive/html/guix-devel/2015-08/msg00753.html>.

* 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.
This commit is contained in:
Ludovic Courtès 2016-10-25 00:58:26 +02:00
parent d91025e3d0
commit ffde82c9ec
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GPG Key ID: 090B11993D9AEBB5
3 changed files with 88 additions and 21 deletions
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69
gnu/build/svg.scm Normal file
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@ -0,0 +1,69 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Andy Wingo <wingo@igalia.com>
;;;
;;; 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 <http://www.gnu.org/licenses/>.
(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

1
gnu/local.mk
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@ -431,6 +431,7 @@ GNU_SYSTEM_MODULES = \
%D%/build/linux-initrd.scm \
%D%/build/linux-modules.scm \
%D%/build/marionette.scm \
%D%/build/svg.scm \
%D%/build/vm.scm \
\
%D%/tests.scm \

39
gnu/system/grub.scm
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@ -27,9 +27,8 @@
#:use-module (gnu artwork)
#:use-module (gnu system file-systems)
#:autoload (gnu packages grub) (grub)
#:autoload (gnu packages inkscape) (inkscape)
#:autoload (gnu packages imagemagick) (imagemagick)
#:autoload (gnu packages compression) (gzip)
#:autoload (gnu packages gtk) (guile-cairo guile-rsvg)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
@ -132,25 +131,23 @@ object denoting a file name."
;;; Background image & themes.
;;;
(define (svg->png svg)
"Build a PNG from SVG."
;; Don't use #:local-build? so that it's substitutable.
(define* (svg->png svg #:key width height)
"Build a PNG of HEIGHT x WIDTH from SVG."
(gexp->derivation "grub-image.png"
#~(zero?
(system* (string-append #$inkscape "/bin/inkscape")
"--without-gui"
(string-append "--export-png=" #$output)
#$svg))))
(with-imported-modules '((gnu build svg))
#~(begin
;; We need these two libraries.
(add-to-load-path (string-append #$guile-rsvg
"/share/guile/site/"
(effective-version)))
(add-to-load-path (string-append #$guile-cairo
"/share/guile/site/"
(effective-version)))
(define (resize-image image width height)
"Resize IMAGE to WIDTHxHEIGHT."
;; Don't use #:local-build? so that it's substitutable.
(let ((size (string-append (number->string width)
"x" (number->string height))))
(gexp->derivation "grub-image.resized.png"
#~(zero?
(system* (string-append #$imagemagick "/bin/convert")
"-resize" #$size #$image #$output)))))
(use-modules (gnu build svg))
(svg->png #$svg #$output
#:width #$width
#:height #$height)))))
(define* (grub-background-image config #:key (width 1024) (height 768))
"Return the GRUB background image defined in CONFIG with a ratio of
@ -160,8 +157,8 @@ WIDTH/HEIGHT, or #f if none was found."
(= (grub-image-aspect-ratio image) ratio))
(grub-theme-images (grub-configuration-theme config)))))
(if image
(mlet %store-monad ((png (svg->png (grub-image-file image))))
(resize-image png width height))
(svg->png (grub-image-file image)
#:width width #:height height)
(with-monad %store-monad
(return #f)))))