diff options
| -rw-r--r-- | gnu/build/svg.scm | 69 | ||||
| -rw-r--r-- | gnu/local.mk | 1 | ||||
| -rw-r--r-- | gnu/system/grub.scm | 41 |
3 files changed, 89 insertions, 22 deletions
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 <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 diff --git a/gnu/local.mk b/gnu/local.mk index 3e900b14fb..1cf81c1648 100644 --- a/gnu/local.mk +++ b/gnu/local.mk @@ -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 \ diff --git a/gnu/system/grub.scm b/gnu/system/grub.scm index ead48f0e32..249b415ab4 100644 --- a/gnu/system/grub.scm +++ b/gnu/system/grub.scm @@ -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) - #$svg)))) - -(define (resize-image image width height) - "Resize IMAGE to WIDTHxHEIGHT." - ;; Don't use #:local-build? so that it's substitutable. - (let ((size (string-append (number->string width) - "x" (number->string height)))) - (gexp->derivation "grub-image.resized.png" - #~(zero? - (system* (string-append #$imagemagick "/bin/convert") - "-resize" #$size #$image #$output))))) + (with-imported-modules '((gnu build svg)) + #~(begin + ;; We need these two libraries. + (add-to-load-path (string-append #$guile-rsvg + "/share/guile/site/" + (effective-version))) + (add-to-load-path (string-append #$guile-cairo + "/share/guile/site/" + (effective-version))) + + (use-modules (gnu build svg)) + (svg->png #$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))))) |