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Code Issues Releases Activity

avfilter/vf_pseudocolor: add heat preset

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This commit is contained in:
Paul B Mahol 2023-07-19 23:16:54 +02:00
parent 5d8879208c
commit 72390c7d80
2 changed files with 23 additions and 0 deletions
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1
doc/filters.texi
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@ -19707,6 +19707,7 @@ Available LUTs:
@item total
@item spectral
@item cool
@item heat
@end table
@item opacity

22
libavfilter/vf_pseudocolor.c
View File

@ -69,6 +69,7 @@ enum Curves {
SOLAR,
SPECTRAL,
COOL,
HEAT,
NB_CURVES,
};
@ -89,6 +90,7 @@ enum Presets {
PRESET_TOTAL,
PRESET_SPECTRAL,
PRESET_COOL,
PRESET_HEAT,
NB_PRESETS,
};
@ -150,6 +152,16 @@ static double coolfunv(double x)
return 0.25 * sin(2.0 * x * M_PI) + 0.5;
}
static double heatfunu(double x)
{
return 0.25 * cos(2.0 * x * M_PI + M_PI) + 0.75;
}
static double heatfunv(double x)
{
return 0.25 * sin(2.0 * x * M_PI) + 0.5;
}
static const Curve curves[] =
{
[MAGMA] = {{
@ -202,6 +214,14 @@ static const Curve curves[] =
.offset = { 0., 0., 0 },
.yuv = 1,
.fun = { coolfunu, limit, coolfunv }, },
[HEAT] = {{
{ 0, 0, 0, 0, 0, 0, 1./256, 0 },
{ 0, 0, 0, 0, 0, 0, 1./256, 0 },
{ 0, 0, 0, 0, 0, 0, 1./256, 0 },
},
.offset = { 0., 0., 0 },
.yuv = 1,
.fun = { heatfunu, limit, heatfunv }, },
};
static const Preset presets[] =
@ -222,6 +242,7 @@ static const Preset presets[] =
[PRESET_SOLAR] = { 1, &full_range, &curves[SOLAR], NULL },
[PRESET_SPECTRAL]= { 1, &full_range, &curves[SPECTRAL],NULL },
[PRESET_COOL] = { 1, &full_range, &curves[COOL], NULL },
[PRESET_HEAT]= { 1, &full_range, &curves[HEAT],NULL },
};
typedef struct PseudoColorContext {
@ -278,6 +299,7 @@ static const AVOption pseudocolor_options[] = {
{ "total", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_TOTAL}, .flags=FLAGS, "preset" },
{ "spectral", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_SPECTRAL},.flags = FLAGS, "preset" },
{ "cool", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COOL}, .flags = FLAGS, "preset" },
{ "heat", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_HEAT}, .flags = FLAGS, "preset" },
{ "opacity", "set pseudocolor opacity",OFFSET(opacity), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, .flags = FLAGS },
{ NULL }
};