X-Git-Url: http://uxul.de/gitweb/?a=blobdiff_plain;f=bmp.lisp;h=d6c547143126fdbbb7d5b11058e2d9a5aeefd4ce;hb=refs%2Fremotes%2Forigin%2FHEAD;hp=24ba92e54d9dbf2445e49dfd84e5d3f2dd5ab064;hpb=32d336f81c7ba63968f935b66d6b601ecf9d400b;p=uxul-world.git

diff --git a/bmp.lisp b/bmp.lisp
index 24ba92e..d6c5471 100755
--- a/bmp.lisp
+++ b/bmp.lisp
@@ -115,6 +115,29 @@ all."
 		    :displaced-index-offset o)
 	(subseq sequence o (+ o l)))))
 
+(defun blit-image (x y src-width src-height src-blob
+		   dst-width dst-height dst-blob)
+  (declare (ignore dst-height))
+  (do ((cx 0 (1+ cx))) ((= cx src-width))
+    (do ((cy 0 (1+ cy))) ((= cy src-height))
+      (let ((src-pos (* 4 (+ cx (* cy src-width))))
+	    (dst-pos (* 4 (+ (+ x cx) (* (+ y cy) dst-width)))))
+	(do ((i 0 (1+ i))) ((= i 4))
+	  (setf (elt dst-blob (+ i dst-pos))
+		(elt src-blob (+ i src-pos))))))))
+
+(defun sub-image (x y width height source-blob source-width source-height)
+  (create-bmp-image
+   width height
+   (lambda (pixels)
+     (do ((cx 0 (1+ cx))) ((= cx width))
+       (do ((cy 0 (1+ cy))) ((= cy height))
+	 (let ((dst-pos (* 4 (+ cx (* cy width))))
+	       (src-pos (* 4 (+ cx x (* (+ cy y) source-width)))))
+	   (do ((i 0 (1+ i))) ((= i 4))
+	     (setf (elt pixels (+ i dst-pos))
+		   (elt source-blob (+ i src-pos))))))))))
+
 (defun resize-pixeldata
     (argb-pixeldata old-width old-height new-width new-height
      &optional (new-pixeldata (make-array (list (* 4 new-width new-height))