X-Git-Url: https://cinelerra-gg.org/git/?a=blobdiff_plain;f=cinelerra-5.1%2Fplugins%2Fperspective%2Fperspective.C;h=3bfa66fe7f13e7164fa7d2c53b725082074b41d1;hb=5dc041305c444ac2612602a93f06c42a144043db;hp=6ad79e5f89f5ea583a1a7a651dd30ba8ee07a858;hpb=f46839d462b640dd0542b2d87c7ab03e72a72613;p=goodguy%2Fcinelerra.git

diff --git a/cinelerra-5.1/plugins/perspective/perspective.C b/cinelerra-5.1/plugins/perspective/perspective.C
index 6ad79e5f..3bfa66fe 100644
--- a/cinelerra-5.1/plugins/perspective/perspective.C
+++ b/cinelerra-5.1/plugins/perspective/perspective.C
@@ -810,6 +810,12 @@ int PerspectiveMain::process_buffer(VFrame *frame,
 	    EQUIV(config.x3, 100) && EQUIV(config.y3, 100) &&
 	    EQUIV(config.x4, 0)   && EQUIV(config.y4, 100) )
 		return 1;
+	if( config.mode == AffineEngine::PERSPECTIVE &&
+	    ( (EQUIV(config.x1, config.x2) && EQUIV(config.x3, config.x4)) ||
+	      (EQUIV(config.y1, config.y3) && EQUIV(config.y2, config.y4)) ) ) {
+		frame->clear_frame();
+		return 0;
+	}
 
 	if( !engine ) {
 		int cpus = get_project_smp() + 1;