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[gacela.git] / gacela_draw.lisp

diff --git a/gacela_draw.lisp b/gacela_draw.lisp
index eeaaac922ae342d450254b4729eb366fc5ec125a..93575a36b578178f578e4ab5ab6d425d7f875ed1 100644 (file)
--- a/gacela_draw.lisp
+++ b/gacela_draw.lisp
@@ -71,13 +71,25 @@
     (cond ((/= image 0)
           (let* ((width (surface-w image)) (height (surface-h image))
                  (power-2 (nearest-power-of-two (min width height)))
-                 (zoomx (/ power-2 width)) (zoomy (/ power-2 height))
                  zoomed-image)
-            (cond ((and (= zoomx 1) (= zoomy 1)) (values image width height))
-                  (t (setq zoomed-image (zoomSurface image zoomx zoomy 0))
+            (cond ((and (= width power-2) (= height power-2)) (values image width height))
+                  (t (setq zoomed-image (resize-image image power-2 power-2))
                      (SDL_FreeSurface image)
                      (cond ((/= zoomed-image 0) (values zoomed-image width height))))))))))
 
+(defun resize-image (image width height)
+  (let ((old-width (surface-w image)) (old-height (surface-h image)))
+    (cond ((and (= width old-width) (= height old-height)) image)
+         (t (let ((zoomx (/ width old-width)) (zoomy (/ height old-height)) zoomed-image)
+              (setq zoomed-image (zoomSurface image zoomx zoomy 0))
+              (let ((new-width (surface-w zoomed-image)) (new-height (surface-h zoomed-image)))
+                (cond ((or (and (= width new-width) (= height new-height))
+                           (and (= old-width new-width) (= old-height new-height))) zoomed-image)
+                      (t (let (rezoomed)
+                           (setq rezoomed (resize-image zoomed-image width height))
+                           (SDL_FreeSurface zoomed-image)
+                           rezoomed)))))))))
+
 (defun load-texture (filename &key (min-filter GL_LINEAR) (mag-filter GL_LINEAR) static)
   (let ((key (make-resource-texture :filename filename :min-filter min-filter :mag-filter mag-filter)))
     (cond ((get-resource key) key)