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avfilter/vf_blend: add softdifference blend mode

This commit is contained in:
Paul B Mahol 2021-09-26 23:08:14 +02:00
parent 53f8a03123
commit e2d40cd1d5
3 changed files with 10 additions and 0 deletions
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1
doc/filters.texi
View File

@ -7559,6 +7559,7 @@ Available values for component modes are:
@item pinlight
@item reflect
@item screen
@item softdifference
@item softlight
@item subtract
@item vividlight

1
libavfilter/blend.h
View File

@ -59,6 +59,7 @@ enum BlendMode {
BLEND_HEAT,
BLEND_FREEZE,
BLEND_EXTREMITY,
BLEND_SOFTDIFFERENCE,
BLEND_NB
};

8
libavfilter/vf_blend.c
View File

@ -104,6 +104,7 @@ static const AVOption blend_options[] = {
{ "subtract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT}, 0, 0, FLAGS, "mode" },
{ "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" },
{ "xor", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR}, 0, 0, FLAGS, "mode" },
{ "softdifference","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTDIFFERENCE}, 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 },
@ -322,6 +323,7 @@ DEFINE_BLEND8(or, A | B)
DEFINE_BLEND8(xor, A ^ B)
DEFINE_BLEND8(vividlight, (A < 128) ? BURN(2 * A, B) : DODGE(2 * (A - 128), B))
DEFINE_BLEND8(linearlight,av_clip_uint8((B < 128) ? B + 2 * A - 255 : B + 2 * (A - 128)))
DEFINE_BLEND8(softdifference,av_clip_uint8((A > B) ? (B == 255) ? 0 : (A - B) * 255 / (255 - B) : (B == 0) ? 0 : (B - A) * 255 / B))
#undef MULTIPLY
#undef SCREEN
@ -365,6 +367,7 @@ DEFINE_BLEND16(or, A | B, 16)
DEFINE_BLEND16(xor, A ^ B, 16)
DEFINE_BLEND16(vividlight, (A < 32768) ? BURN(2 * A, B) : DODGE(2 * (A - 32768), B), 16)
DEFINE_BLEND16(linearlight,av_clip_uint16((B < 32768) ? B + 2 * A - 65535 : B + 2 * (A - 32768)), 16)
DEFINE_BLEND16(softdifference,av_clip_uint16((A > B) ? (B == 65535) ? 0 : (A - B) * 65535 / (65535 - B) : (B == 0) ? 0 : (B - A) * 65535 / B), 16)
#undef MULTIPLY
#undef SCREEN
@ -408,6 +411,7 @@ DEFINE_BLEND16(or, A | B, 10)
DEFINE_BLEND16(xor, A ^ B, 10)
DEFINE_BLEND16(vividlight, (A < 512) ? BURN(2 * A, B) : DODGE(2 * (A - 512), B), 10)
DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 512) ? B + 2 * A - 1023 : B + 2 * (A - 512), 10), 10)
DEFINE_BLEND16(softdifference,(int)av_clip_uintp2((A > B) ? (B == 1023) ? 0 : (A - B) * 1023 / (1023 - B) : (B == 0) ? 0 : (B - A) * 1023 / B, 10), 10)
#undef MULTIPLY
#undef SCREEN
@ -451,6 +455,7 @@ DEFINE_BLEND16(or, A | B, 12)
DEFINE_BLEND16(xor, A ^ B, 12)
DEFINE_BLEND16(vividlight, (A < 2048) ? BURN(2 * A, B) : DODGE(2 * (A - 2048), B), 12)
DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 2048) ? B + 2 * A - 4095 : B + 2 * (A - 2048), 12), 12)
DEFINE_BLEND16(softdifference,(int)av_clip_uintp2((A > B) ? (B == 4095) ? 0 : (A - B) * 4095 / (4095 - B) : (B == 0) ? 0 : (B - A) * 4095 / B, 12), 12)
#undef MULTIPLY
#undef SCREEN
@ -494,6 +499,7 @@ DEFINE_BLEND16(or, A | B, 9)
DEFINE_BLEND16(xor, A ^ B, 9)
DEFINE_BLEND16(vividlight, (A < 256) ? BURN(2 * A, B) : DODGE(2 * (A - 256), B), 9)
DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 256) ? B + 2 * A - 511 : B + 2 * (A - 256), 9), 9)
DEFINE_BLEND16(softdifference,(int)av_clip_uintp2((A > B) ? (A - B) * 511 / (511 - B) : (B == 0) ? 0 : (B - A) * 511 / B, 9), 9)
#undef MULTIPLY
#undef SCREEN
@ -537,6 +543,7 @@ DEFINE_BLEND32(or, av_int2float(av_float2int(A) | av_float2int(B)), 32)
DEFINE_BLEND32(xor, av_int2float(av_float2int(A) ^ av_float2int(B)), 32)
DEFINE_BLEND32(vividlight, (A < 0.5) ? BURN(2 * A, B) : DODGE(2 * (A - 0.5), B), 32)
DEFINE_BLEND32(linearlight,(B < 0.5) ? B + 2 * A - 1.0 : B + 2 * (A - 0.5), 32)
DEFINE_BLEND32(softdifference, (A > B) ? (B == 1.f) ? 0.f : (A - B) / (1.f - B) : (B == 0.f) ? 0.f : (B - A) / B, 32)
#define DEFINE_BLEND_EXPR(type, name, div) \
static void blend_expr_## name(const uint8_t *_top, ptrdiff_t top_linesize, \
@ -733,6 +740,7 @@ 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;\
} \
}
DEFINE_INIT_BLEND_FUNC(8, 8)