[FFmpeg-cvslog] doc/filters: add few more examples for blend filter

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Thu Oct 31 13:31:11 2013 +0000| [49287bbfd3227b0718fddb976d19bebae52b71ef] | committer: Paul B Mahol

doc/filters: add few more examples for blend filter

Signed-off-by: Paul B Mahol <onemda at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=49287bbfd3227b0718fddb976d19bebae52b71ef
---

 doc/filters.texi |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/doc/filters.texi b/doc/filters.texi
index 14692a2..57679cc 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2412,6 +2412,24 @@ Apply 1x1 checkerboard effect:
 @example
 blend=all_expr='if(eq(mod(X,2),mod(Y,2)),A,B)'
 @end example
+
+ at item
+Apply uncover left effect:
+ at example
+blend=all_expr='if(gte(N*SW+X,W),A,B)'
+ at end example
+
+ at item
+Apply uncover down effect:
+ at example
+blend=all_expr='if(gte(Y-N*SH,0),A,B)'
+ at end example
+
+ at item
+Apply uncover up-left effect:
+ at example
+blend=all_expr='if(gte(T*SH*40+Y,H)*gte((T*40*SW+X)*W/H,W),A,B)'
+ at end example
 @end itemize
 
 @section boxblur