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-rw-r--r--gnu/build/svg.scm69
-rw-r--r--gnu/local.mk1
-rw-r--r--gnu/system/grub.scm41
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)))))