From c32b0b65695aae1e3c48a2732548f470fbae1586 Mon Sep 17 00:00:00 2001 From: Andrew Randrianasulu Date: Sun, 30 Oct 2022 21:35:13 +0300 Subject: [PATCH] subtract mode ? --- cinelerra-5.1/cinelerra/overlayframe.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/cinelerra-5.1/cinelerra/overlayframe.h b/cinelerra-5.1/cinelerra/overlayframe.h index 13c2e4bd..b364e619 100644 --- a/cinelerra-5.1/cinelerra/overlayframe.h +++ b/cinelerra-5.1/cinelerra/overlayframe.h @@ -57,7 +57,8 @@ // SUBTRACT [(Sa - Da), (Sc - Dc)] #define ALPHA_SUBTRACT(mx, Sa, Da) (Sa - Da) -#define COLOR_SUBTRACT(mx, Sc, Sa, Dc, Da) (Sc - Dc) +#define COLOR_SUBTRACT(mx, Sc, Sa, Dc, Da) \ + (ZERO > (Sc - Dc) ? ZERO : (Sc - Dc)) #define CHROMA_SUBTRACT COLOR_SUBTRACT // MULTIPLY [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + Sc * Dc] -- 2.38.1