| 1 | ;; Common Lisp bindings for librsvg |
| 2 | ;; Copyright 2005 Espen S. Johnsen <espen@users.sf.net> |
| 3 | ;; |
| 4 | ;; Permission is hereby granted, free of charge, to any person obtaining |
| 5 | ;; a copy of this software and associated documentation files (the |
| 6 | ;; "Software"), to deal in the Software without restriction, including |
| 7 | ;; without limitation the rights to use, copy, modify, merge, publish, |
| 8 | ;; distribute, sublicense, and/or sell copies of the Software, and to |
| 9 | ;; permit persons to whom the Software is furnished to do so, subject to |
| 10 | ;; the following conditions: |
| 11 | ;; |
| 12 | ;; The above copyright notice and this permission notice shall be |
| 13 | ;; included in all copies or substantial portions of the Software. |
| 14 | ;; |
| 15 | ;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | ;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 17 | ;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | ;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| 19 | ;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| 20 | ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| 21 | ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 22 | |
| 23 | ;; $Id: rsvg.lisp,v 1.9 2008-10-08 18:24:01 espen Exp $ |
| 24 | |
| 25 | (in-package "RSVG") |
| 26 | |
| 27 | |
| 28 | (eval-when (:compile-toplevel :load-toplevel :execute) |
| 29 | (init-types-in-library rsvg "librsvg-2" :prefix "rsvg_") |
| 30 | |
| 31 | (define-types-by-introspection "Rsvg" |
| 32 | ("RsvgError" :ignore t))) |
| 33 | |
| 34 | |
| 35 | (defbinding init () nil) |
| 36 | (defbinding term () nil) |
| 37 | |
| 38 | (defbinding (set-default-dpi "rsvg_set_default_dpi_x_y") (dpi-x &optional (dpi-y dpi-x)) nil |
| 39 | (dpi-x double-float) |
| 40 | (dpi-y double-float)) |
| 41 | |
| 42 | |
| 43 | (defbinding handle-write () boolean |
| 44 | (handle handle) |
| 45 | (data (vector (integer 8))) |
| 46 | ((length data) int) |
| 47 | (nil gerror-signal :out)) |
| 48 | |
| 49 | (defbinding handle-close () boolean |
| 50 | (handle handle) |
| 51 | (nil gerror-signal :out)) |
| 52 | |
| 53 | (defbinding (handle-get-pixbuf "rsvg_handle_get_pixbuf_sub") (handle &optional id) boolean |
| 54 | (handle handle) |
| 55 | (id (or null string))) |
| 56 | |
| 57 | |
| 58 | (defbinding %handle-new-from-data () pointer |
| 59 | (data string) |
| 60 | ((1- (utf8-length data)) int) |
| 61 | (nil gerror-signal :out)) |
| 62 | |
| 63 | (defbinding %handle-new-from-file () pointer |
| 64 | (filename pathname) |
| 65 | (nil gerror-signal :out)) |
| 66 | |
| 67 | (defmethod allocate-foreign ((handle handle) &key data filename) |
| 68 | (cond |
| 69 | (filename (%handle-new-from-file filename)) |
| 70 | (data (%handle-new-from-data data)) |
| 71 | (t (call-next-method)))) |
| 72 | |
| 73 | (defmacro with-handle ((handle &rest args) &body body) |
| 74 | `(let ((,handle (make-instance 'handle ,@args))) |
| 75 | (unwind-protect |
| 76 | (progn ,@body) |
| 77 | (handle-close ,handle)))) |
| 78 | |
| 79 | ;;; Cairo interface |
| 80 | |
| 81 | (defbinding (render-cairo "rsvg_handle_render_cairo_sub") (handle cr &optional id) nil |
| 82 | (handle handle) |
| 83 | (cr cairo:context) |
| 84 | (id (or null string))) |
| 85 | |
| 86 | (defun image-surface-create-from-svg (filename &key width height (format :argb32)id) |
| 87 | (with-handle (handle :filename filename) |
| 88 | (multiple-value-bind (width height) |
| 89 | (cond |
| 90 | ((and width height) (values width height)) |
| 91 | (width |
| 92 | (let ((ratio (/ (handle-height handle) (handle-width handle)))) |
| 93 | (values width (truncate (* width ratio))))) |
| 94 | (height |
| 95 | (let ((ratio (/ (handle-width handle) (handle-height handle)))) |
| 96 | (values (truncate (* height ratio)) height))) |
| 97 | (t (values (handle-width handle) (handle-height handle)))) |
| 98 | (let ((image (make-instance 'cairo:image-surface |
| 99 | :width width :height height :format format))) |
| 100 | (cairo:with-surface (image cr) |
| 101 | (cairo:scale cr (/ width (handle-width handle)) (/ height (handle-height handle))) |
| 102 | (render-cairo handle cr id)) |
| 103 | image)))) |