From a673761ce8bad005f2eb7b0dc584854a10b96e18 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Thu, 30 Sep 2021 01:20:18 +0200
Subject: [PATCH] avfilter/vf_blend: add few more modes

---
 doc/filters.texi          | 10 +++++++---
 libavfilter/blend.h       |  4 ++++
 libavfilter/blend_modes.c |  4 ++++
 libavfilter/vf_blend.c    | 10 +++++++++-
 4 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index 0813232480..cbec749ce8 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -7531,24 +7531,27 @@ of @var{all_mode}. Default value is @code{normal}.
 Available values for component modes are:
 @table @samp
 @item addition
-@item grainmerge
 @item and
 @item average
+@item bleach
 @item burn
 @item darken
 @item difference
-@item grainextract
 @item divide
 @item dodge
-@item freeze
 @item exclusion
 @item extremity
+@item freeze
 @item geometric
 @item glow
+@item grainextract
+@item grainmerge
 @item hardlight
 @item hardmix
+@item hardoverlay
 @item harmonic
 @item heat
+@item interpolate
 @item lighten
 @item linearlight
 @item multiply
@@ -7563,6 +7566,7 @@ Available values for component modes are:
 @item screen
 @item softdifference
 @item softlight
+@item stain
 @item subtract
 @item vividlight
 @item xor
diff --git a/libavfilter/blend.h b/libavfilter/blend.h
index 85c287a5d8..ff417650cf 100644
--- a/libavfilter/blend.h
+++ b/libavfilter/blend.h
@@ -62,6 +62,10 @@ enum BlendMode {
     BLEND_SOFTDIFFERENCE,
     BLEND_GEOMETRIC,
     BLEND_HARMONIC,
+    BLEND_BLEACH,
+    BLEND_STAIN,
+    BLEND_INTERPOLATE,
+    BLEND_HARDOVERLAY,
     BLEND_NB
 };
 
diff --git a/libavfilter/blend_modes.c b/libavfilter/blend_modes.c
index 9ab2d4420a..64cd6e8a54 100644
--- a/libavfilter/blend_modes.c
+++ b/libavfilter/blend_modes.c
@@ -145,3 +145,7 @@ fn(linearlight,CLIP((B < HALF) ? B + 2 * A - MAX : B + 2 * (A - HALF)))
 fn(softdifference,CLIP((A > B) ? (B == MAX) ? 0 : (A - B) * MAX / (MAX - B) : (B == 0) ? 0 : (B - A) * MAX / B))
 fn(geometric,  GEOMETRIC(A, B))
 fn(harmonic,   A == 0 && B == 0 ? 0 : 2LL * A * B / (A + B))
+fn(bleach,     (MAX - B) + (MAX - A) - MAX)
+fn(stain,      2 * MAX - A - B)
+fn(interpolate,lrintf(MAX * (2 - cosf(A * M_PI / MAX) - cosf(B * M_PI / MAX)) * 0.25f))
+fn(hardoverlay,A == MAX ? MAX : FFMIN(MAX, MAX * B / (2 * MAX - 2 * A) * (A > HALF) + 2 * A * B / MAX * (A <= HALF)))
diff --git a/libavfilter/vf_blend.c b/libavfilter/vf_blend.c
index 09a10ff0e0..ddfd6cf0f0 100644
--- a/libavfilter/vf_blend.c
+++ b/libavfilter/vf_blend.c
@@ -134,6 +134,10 @@ static const AVOption blend_options[] = {
     { "softdifference","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTDIFFERENCE}, 0, 0, FLAGS, "mode" },
     { "geometric",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GEOMETRIC},  0, 0, FLAGS, "mode" },
     { "harmonic",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARMONIC},   0, 0, FLAGS, "mode" },
+    { "bleach",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BLEACH},     0, 0, FLAGS, "mode" },
+    { "stain",      "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_STAIN},      0, 0, FLAGS, "mode" },
+    { "interpolate","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_INTERPOLATE},0, 0, FLAGS, "mode" },
+    { "hardoverlay","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDOVERLAY},0, 0, FLAGS, "mode" },
     { "c0_expr",  "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
     { "c1_expr",  "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
     { "c2_expr",  "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
@@ -397,9 +401,13 @@ static av_cold void init_blend_func_##depth##_##nbits##bit(FilterParams *param)
     case BLEND_SUBTRACT:     param->blend = blend_subtract_##depth##bit;     break;   \
     case BLEND_VIVIDLIGHT:   param->blend = blend_vividlight_##depth##bit;   break;   \
     case BLEND_XOR:          param->blend = blend_xor_##depth##bit;          break;   \
-    case BLEND_SOFTDIFFERENCE:param->blend = blend_softdifference_##depth##bit; break;\
+    case BLEND_SOFTDIFFERENCE:param->blend=blend_softdifference_##depth##bit;break;   \
     case BLEND_GEOMETRIC:    param->blend = blend_geometric_##depth##bit;    break;   \
     case BLEND_HARMONIC:     param->blend = blend_harmonic_##depth##bit;     break;   \
+    case BLEND_BLEACH:       param->blend = blend_bleach_##depth##bit;       break;   \
+    case BLEND_STAIN:        param->blend = blend_stain_##depth##bit;        break;   \
+    case BLEND_INTERPOLATE:  param->blend = blend_interpolate_##depth##bit;  break;   \
+    case BLEND_HARDOVERLAY:  param->blend = blend_hardoverlay_##depth##bit;  break;   \
     }                                                                                 \
 }
 DEFINE_INIT_BLEND_FUNC(8, 8)