Add rect module.
authorDavid Thompson <dthompson2@worcester.edu>
Tue, 8 Jan 2019 03:51:58 +0000 (22:51 -0500)
committerDavid Thompson <dthompson2@worcester.edu>
Tue, 8 Jan 2019 03:51:58 +0000 (22:51 -0500)
* sdl2/rect.scm: New file.
* Makefile.am (SOURCES): Add it.

Makefile.am
sdl2/rect.scm [new file with mode: 0644]

index a4e22ad..d912ce9 100644 (file)
@@ -45,6 +45,7 @@ SOURCES =                                     \
   sdl2/config.scm                              \
   sdl2/bindings.scm                            \
   sdl2/clipboard.scm                           \
+  sdl2/rect.scm                                        \
   sdl2/surface.scm                             \
   sdl2/render.scm                              \
   sdl2/video.scm                               \
diff --git a/sdl2/rect.scm b/sdl2/rect.scm
new file mode 100644 (file)
index 0000000..8b71622
--- /dev/null
@@ -0,0 +1,58 @@
+;;; guile-sdl2 --- FFI bindings for SDL2
+;;; Copyright © 2018 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 rect)
+  #:use-module (rnrs bytevectors)
+  #:use-module ((sdl2 bindings) #:prefix ffi:)
+  #:use-module (srfi srfi-9)
+  #:use-module (system foreign)
+  #:export (make-rect
+            rect?
+            rect-x
+            rect-y
+            rect-width
+            rect-height))
+
+(define-record-type <rect>
+  (%make-rect bv ptr)
+  rect?
+  (bv rect-bv)
+  (ptr unwrap-rect))
+
+(define (make-rect x y width height)
+  (let ((bv (s32vector x y width height)))
+    (%make-rect bv (bytevector->pointer bv))))
+
+(define (rect-x rect)
+  (s32vector-ref (rect-bv rect) 0))
+
+(define (rect-y rect)
+  (s32vector-ref (rect-bv rect) 1))
+
+(define (rect-width rect)
+  (s32vector-ref (rect-bv rect) 2))
+
+(define (rect-height rect)
+  (s32vector-ref (rect-bv rect) 3))