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authorDavid Thompson <dthompson2@worcester.edu>2015-12-16 23:15:21 -0500
committerDavid Thompson <dthompson2@worcester.edu>2015-12-16 23:15:21 -0500
commitcc099b061c9466f5d0d3220c71d1c43f13b139d2 (patch)
tree8c44658891c84ce8d3188728a352fedd3c9ee560
parent1de096a76ca8c06bbd305f1f1c437707e53fbce8 (diff)
Add SDL2_image bindings.
* sdl2/bindings/image.scm: New file. * sdl2/image.scm: New file. * Makefile.am (SOURCES): Add them.
-rw-r--r--Makefile.am8
-rw-r--r--sdl2/bindings/image.scm56
-rw-r--r--sdl2/image.scm51
3 files changed, 115 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am
index 80512fc..489c99e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,6 +49,14 @@ SOURCES = \
sdl2/video.scm \
sdl2/events.scm
+if WITH_LIBSDL2_IMAGE
+
+SOURCES += \
+ sdl2/bindings/image.scm \
+ sdl2/image.scm
+
+endif
+
EXTRA_DIST += \
pre-inst-env.in \
README \
diff --git a/sdl2/bindings/image.scm b/sdl2/bindings/image.scm
new file mode 100644
index 0000000..cfdb31d
--- /dev/null
+++ b/sdl2/bindings/image.scm
@@ -0,0 +1,56 @@
+;;; 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:
+;;
+;; Low-level FFI bindings for SDL2_image.
+;;
+;;; Code:
+
+(define-module (sdl2 bindings image)
+ #:use-module (system foreign)
+ #:use-module (sdl2 config))
+
+(define sdl-image-func
+ (let ((lib (dynamic-link %libsdl2-image)))
+ (lambda (return-type function-name arg-types)
+ "Return a procedure for the foreign function FUNCTION-NAME in
+the SDL2_image shared library. That function must return a value of
+RETURN-TYPE and accept arguments of ARG-TYPES."
+ (pointer->procedure return-type
+ (dynamic-func function-name lib)
+ arg-types))))
+
+(define-syntax-rule (define-foreign name return-type func-name arg-types)
+ (define-public name
+ (sdl-image-func return-type func-name arg-types)))
+
+(define-public IMG_INIT_JPG #x00000001)
+(define-public IMG_INIT_PNG #x00000002)
+(define-public IMG_INIT_TIF #x00000004)
+(define-public IMG_INIT_WEBP #x00000008)
+
+(define-foreign img-init
+ int "IMG_Init" (list int))
+
+(define-foreign img-quit
+ void "IMG_Quit" '())
+
+(define-foreign img-load
+ '* "IMG_Load" '(*))
diff --git a/sdl2/image.scm b/sdl2/image.scm
new file mode 100644
index 0000000..e741a04
--- /dev/null
+++ b/sdl2/image.scm
@@ -0,0 +1,51 @@
+;;; 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))
+
+(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))))