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authorDavid Thompson <dthompson2@worcester.edu>2015-12-13 22:51:33 -0500
committerDavid Thompson <dthompson2@worcester.edu>2015-12-13 22:51:33 -0500
commit8a3a26bb77c61784dc426d4cc3dd66a8071b5e49 (patch)
tree1ab00c798c1f62bb1854449547950308aab8fb4d /sdl2/surface.scm
parentd4824b20c811ae859541de72ac971b070cf9f9d2 (diff)
Add a few surface bindings.
* sdl2/bindings.scm (sdl-rw-from-file, sdl-free-surface, sdl-load-bmp-rw): New procedures. * sdl2/surface.scm: New file. * Makefile.am (SOURCES): Add it.
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diff --git a/sdl2/surface.scm b/sdl2/surface.scm
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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:
+;;
+;; SDL surface manipulation.
+;;
+;;; Code:
+
+(define-module (sdl2 surface)
+ #:use-module (ice-9 format)
+ #:use-module (ice-9 match)
+ #:use-module (system foreign)
+ #:use-module ((sdl2 bindings) #:prefix ffi:)
+ #:use-module (sdl2)
+ #:export (surface?
+ delete-surface!
+ call-with-surface
+ load-bmp))
+
+(define-wrapped-pointer-type <surface>
+ surface?
+ wrap-surface unwrap-surface
+ (lambda (context port)
+ (format port "#<surface ~x>"
+ (pointer-address (unwrap-surface context)))))
+
+(define (delete-surface! surface)
+ "Free the memory used by SURFACE."
+ (ffi:sdl-free-surface (unwrap-surface surface)))
+
+(define (call-with-surface surface proc)
+ "Call PROC, passing it SURFACE and deleting SURFACE upon exit of
+PROC."
+ (dynamic-wind
+ (const #t)
+ (lambda ()
+ (proc surface))
+ (lambda ()
+ (delete-surface! surface))))
+
+;; The equivalent of the SDL_LoadBMP C macro.
+(define (load-bmp file)
+ "Create a new surface from the bitmap data in FILE."
+ (let ((ptr (ffi:sdl-load-bmp-rw (ffi:sdl-rw-from-file (string->pointer file)
+ (string->pointer "rb"))
+ 1)))
+ (if (null-pointer? ptr)
+ (sdl-error "load-bmp" "failed to load bitmap")
+ (wrap-surface ptr))))