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;;; guile-sdl2 --- FFI bindings for SDL2
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; This file is part of guile-sdl2.
;;;
;;; Guile-sdl2 is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-sdl2 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 Lesser General Public
;;; License along with guile-sdl2. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Image loading.
;;
;;; Code:
(define-module (sdl2 image)
#:use-module (system foreign)
#:use-module (sdl2)
#:use-module ((sdl2 bindings image) #:prefix ffi:)
#:export (image-init
image-quit
load-image
save-png))
(define (image-init)
"Initialize dynamically loaded image libraries."
(ffi:img-init (logior ffi:IMG_INIT_JPG
ffi:IMG_INIT_PNG
ffi:IMG_INIT_TIF
ffi:IMG_INIT_WEBP))
*unspecified*)
(define (image-quit)
"Clean up dynamically loaded image libraries."
(ffi:img-quit))
(define (load-image file)
"Load the image in FILE and return an SDL surface."
(let ((ptr (ffi:img-load (string->pointer file))))
(if (null-pointer? ptr)
(sdl-error "load-image" "failed to load image: ~a" file)
((@@ (sdl2 surface) wrap-surface) ptr))))
(define (save-png surface file)
"Save SURFACE to FILE as a PNG formatted image."
(unless (zero? (ffi:img-save-png ((@@ (sdl2 surface) unwrap-surface) surface)
(string->pointer file)))
(sdl-error "save-png" "failed to save surface as PNG: ~a" file)))
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