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authorDavid Thompson <dthompson2@worcester.edu>2019-01-08 21:19:52 -0500
committerDavid Thompson <dthompson2@worcester.edu>2019-01-08 21:29:48 -0500
commit5ef8b648869d109ea840d20d5d59df1455687d49 (patch)
tree20cbb18d0a516ff1f069df662650caf45f8e163d
parentc519f8238fc05bb4e0b12bf4650264fec36d7050 (diff)
surface: Add SDL_BlitScaled binding.
* sdl2/bindings.scm (sdl-blit-scaled): New procedure. * sdl2/surface.scm (blit-scaled): New procedure. * doc/api.texi (Surfaces): Document it.
-rw-r--r--doc/api.texi7
-rw-r--r--sdl2/bindings.scm3
-rw-r--r--sdl2/surface.scm17
3 files changed, 26 insertions, 1 deletions
diff --git a/doc/api.texi b/doc/api.texi
index f09cdfd..7e47fd7 100644
--- a/doc/api.texi
+++ b/doc/api.texi
@@ -994,6 +994,13 @@ Blit the rectangle @var{src-rect} from the surface @var{src} to
@var{dst-rect} of the surface @var{dst}.
@end deffn
+@deffn {Procedure} blit-scaled @var{src} @var{src-rect} @var{dst} @var{dst-rect}
+Blit the rectangle @var{src-rect} from the surface @var{src} to
+@var{dst-rect} of the surface @var{dst}, scaling the source to fit the
+destination.
+@end deffn
+
+
@node Rendering
@section Rendering
diff --git a/sdl2/bindings.scm b/sdl2/bindings.scm
index 7c16abb..1f97186 100644
--- a/sdl2/bindings.scm
+++ b/sdl2/bindings.scm
@@ -946,6 +946,9 @@ RETURN-TYPE and accept arguments of ARG-TYPES."
(define-foreign sdl-blit-surface
int "SDL_UpperBlit" '(* * * *))
+(define-foreign sdl-blit-scaled
+ int "SDL_UpperBlitScaled" '(* * * *))
+
;;;
;;; Audio
diff --git a/sdl2/surface.scm b/sdl2/surface.scm
index a918bd7..3770a17 100644
--- a/sdl2/surface.scm
+++ b/sdl2/surface.scm
@@ -64,7 +64,8 @@
surface-pitch
surface-pixels
convert-surface-format
- blit-surface))
+ blit-surface
+ blit-scaled))
;;;
@@ -449,3 +450,17 @@ surface DST."
((@@ (sdl2 rect) unwrap-rect) dst-rect)
%null-pointer)))
(sdl-error "blit-surface" "failed to blit surface ~a to ~a" src dst)))
+
+(define (blit-scaled src src-rect dst dst-rect)
+ "Blit the rectangle SRC-RECT from the surface SRC to DST-RECT of the
+surface DST, scaling the source to fit the destination."
+ (unless (zero?
+ (ffi:sdl-blit-surface (unwrap-surface src)
+ (if src-rect
+ ((@@ (sdl2 rect) unwrap-rect) src-rect)
+ %null-pointer)
+ (unwrap-surface dst)
+ (if dst-rect
+ ((@@ (sdl2 rect) unwrap-rect) dst-rect)
+ %null-pointer)))
+ (sdl-error "blit-scaled" "failed to blit surface ~a to ~a" src dst)))