X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fimage.cc;h=e79073d4cf81e276ba32dc41f3d89df05d97ab7c;hb=a16a1a6cb3d831842f75e13653934360db617097;hp=c2452126572c342a39929ce0940c9604cb20ad6b;hpb=ccc1a688b59e25bb934a0d3e2bbf477960068d4f;p=laserbrain_demo

diff --git a/src/image.cc b/src/image.cc
index c245212..e79073d 100644
--- a/src/image.cc
+++ b/src/image.cc
@@ -143,6 +143,34 @@ void Image::rotate_180()
 	flip_horizontal();
 }
 
+void Image::resize_half()
+{
+	int pixsz = pixel_size(fmt);
+	int newxsz = width / 2;
+	int newysz = height / 2;
+
+	if(!newxsz || !newysz) return;
+
+	unsigned char *newpix = new unsigned char[newxsz * newysz * pixsz];
+
+	unsigned char *sptr = (unsigned char*)pixels;
+	unsigned char *dptr = newpix;
+
+	for(int i=0; i<newysz; i++) {
+		if(i & 1) sptr += width * pixsz;
+		for(int j=0; j<newxsz; j++) {
+			memcpy(dptr, sptr, pixsz);
+			dptr += pixsz;
+			sptr += pixsz * 2;
+		}
+	}
+
+	delete [] (char*)pixels;
+	pixels = newpix;
+	width = newxsz;
+	height = newysz;
+}
+
 bool Image::load(const char *fname)
 {
 	struct img_pixmap pixmap;