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GNU Guix consists of Scheme code that implements the deployment model
of the Nix package management tool.  In fact, it currently talks to a
build daemon whose code comes from Nix (see the manual for details.)

Nix was initially written by Eelco Dolstra; other people have been
contributing to it.  See `nix/AUTHORS' for details.

The list of GNU Guix contributors is now generated from the output of
'git log' and written to this file, as can be seen in release tarballs.
generated by cgit
GNU Guix. If not, see <http://www.gnu.org/licenses/>. (define-module (gnu build svg) #:use-module (rsvg) #:use-module (cairo) #:use-module (srfi srfi-11) #:export (svg->png)) (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 em ex) (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
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