1 files changed, 86 insertions, 0 deletions
diff --git a/Plugins/bend.c b/Plugins/bend.c
new file mode 100644
index 0000000..753159d
--- /dev/null
+++ b/Plugins/bend.c
@@ -0,0 +1,86 @@
+#include <stdlib.h>
+#include <string.h>
+#include "plugin.h"
+
+void perform_effect(_frame f, _args a)
+{
+	printf("NOTE: bend as effect does nothing. Use bend as copy operation.\n");
+}
+
+void perform_copy(_frame f1, _frame f2, _args a)
+{
+	int x, y, w, h, pos, pos2, src, ysrc, ypos1, ypos2,
+	 widthminuspos, widthminuspos2, widthminusone,
+	 heightminusypos1, heightminusypos2;
+	pixel8 *p1, *p2, tp=0, tpy=0;
+	char *t;
+	byte pixelsize = f1.pixelformat/8;
+
+	if(!a.s) return;
+	pos = atoi(a.s);
+	if(t = strstr(a.s, " "))
+	{
+		pos2 = atoi(t+1);
+		tp = 1;
+		if(t = strstr(t+1, " "))
+		{
+			ypos1 = atoi(t+1);
+			if(t = strstr(t+1, " "))
+			{
+				ypos2 = atoi(t+1);
+				if(ypos1>0||ypos2>0) tpy = 1;
+			}
+		}
+	}
+
+	w = f1.width<f2.width ? f1.width : f2.width;
+	h = f1.height<f2.height ? f1.height : f2.height;
+
+	if(pos<0) pos=0;
+	if(pos>=w) pos=w-1;
+	if(pos2<0) pos2=0;
+	if(pos2>=w) pos2=w-1;
+
+	if(ypos1<0) ypos1=0;
+	if(ypos1>=w) ypos1=w-1;
+	if(ypos2<0) ypos2=0;
+	if(ypos2>=w) ypos2=w-1;
+
+	widthminuspos = f1.width-pos;
+	widthminuspos2 = f1.width-pos2;
+	widthminusone = w-1;
+
+	heightminusypos1 = f1.height-ypos1;
+	heightminusypos2 = f1.height-ypos2;
+
+	// here we'll avoid checking for pixelformat by taking the source and destination
+	// offsets as 8-bit, and multiplying that by pixelsize
+
+	for(y=0; y<h; y++)
+	{
+		p1 = scanline(f1, y);
+		p2 = scanline(f2, y);
+		for(x=0; x<w; x++)
+		{
+			if(!tp)
+			{
+				memcpy(&p2[x*pixelsize], x<pos||pos-(x-pos)<0 ? &p1[x*pixelsize]
+				 : &p1[(pos-(x-pos))*pixelsize], pixelsize);
+			} else
+			{
+				src = x<pos ? x/(float)pos*pos2
+				 : pos2+((x-pos)/(float)widthminuspos*widthminuspos2);
+
+				if(!tpy) {
+					memcpy(&p2[x*pixelsize], &p1[src*pixelsize], pixelsize);
+				} else {
+					ysrc = y<ypos1 ? y/(float)ypos1*ypos2
+					 : ypos2+((y-ypos1)/(float)heightminusypos1*heightminusypos2);
+					
+					memcpy(&p2[x*pixelsize], &scanline(f1, ysrc)[src*pixelsize],
+					 pixelsize);
+				}
+			}
+		}
+	}
+}