;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2016, 2017, 2018 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 (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 NG?id=2d315cd428484537e763d7f7c676dc5fff7995f6'>doc: Move "Commit Access" section from 'HACKING' to the manual....* HACKING (Commit Access): Remove. (Contributing): Update URL of the manual. * doc/contributing.texi (Commit Access): New section. (Submitting Patches): Add cross reference. Ludovic Courtès 2020-01-09doc: Add "Tracking Bugs and Patches" section....* doc/contributing.texi (Tracking Bugs and Patches): New section. (Submitting Patches): Refer to it. * doc/guix.texi: Update copyright line. * HACKING (Using emacs-debbugs): Remove. Ludovic Courtès 2019-07-13doc: Update keyserver URL....* HACKING (Commit Access): Change keyserver URL to 'keys.openpgp.org'. Leo Famulari 2019-02-11HACKING: Update key server....* HACKING (Commit Access): Recommend pool.sks-keyservers.net. Ludovic Courtès 2018-07-22doc: Fix typo (missing period)...* HACKING (Commit Access): Fix typo. Pierre Neidhardt 2017-08-19doc: Mention how to use emacs-debbugs....* HACKING (Using emacs-debbugs): Add section on using emacs-debbugs. Arun Isaac 2017-03-27maint: Give command to install the pre-push hook....* HACKING: Add 'cp' line to install the pre-push hook. Ludovic Courtès 2017-03-24maint: Mention the Signed-off-by line in 'HACKING'....* HACKING: Mention the Signed-off-by line. Clément Lassieur 2017-03-15maint: Mention guix-patches@gnu.org in 'HACKING'....Fixes <http://bugs.gnu.org/25899>. * HACKING: Mention guix-patches@gnu.org. Ludovic Courtès 2017-01-30maint: Fix invalid calls to 'info'....* HACKING <Contributing>: Remove name of the manual from the item argument. * README <Installation>: Likewise. Mathieu Lirzin 2017-01-04doc: Add a Git hook that verifies signatures before pushing....* HACKING (Commit Access): Describe the pre-push Git hook. * etc/git/pre-push: New file. Leo Famulari