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filter_kernels: add ewa_lanczossharp alias

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This is essentially a preconfigured version of ewa_lanczos, with the
"best" parameters for general purpose usage.
This commit is contained in:
Niklas Haas 2015-02-24 00:52:17 +01:00
parent eb70e31cc7
commit d27563cb14
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2 changed files with 14 additions and 2 deletions
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12
DOCS/man/vo.rst
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@ -310,12 +310,20 @@ Available video output drivers are:
``ewa_lanczos`` ``ewa_lanczos``
Elliptic weighted average Lanczos scaling. Also known as Jinc. Elliptic weighted average Lanczos scaling. Also known as Jinc.
Relatively slow, but very good quality. The number of taps can Relatively slow, but very good quality. The radius can be
be controlled with ``scale-radius``. Adding extra taps makes the controlled with ``scale-radius``. Increasing the radius makes the
filter sharper but adds more ringing. filter sharper but adds more ringing.
This filter supports antiringing (see ``scale-antiring``). This filter supports antiringing (see ``scale-antiring``).
``ewa_lanczossharp``
A slightly sharpened version of ewa_lanczos, preconfigured to use
an ideal radius and parameter. If your hardware can run it, this is
probably what you should use by default.
Note: This filter has a fixed radius. Use ``ewa_lanczos`` if you
want to adjust it.
``mitchell`` ``mitchell``
Mitchell-Netravali. The ``B`` and ``C`` parameters can be set with Mitchell-Netravali. The ``B`` and ``C`` parameters can be set with
``scale-param1`` and ``scale-param2``. This filter is very good at ``scale-param1`` and ``scale-param2``. This filter is very good at

4
video/out/filter_kernels.c
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@ -348,6 +348,10 @@ const struct filter_kernel mp_filter_kernels[] = {
{"ewa_lanczos", -1, ewa_lanczos, .params = {1.0, NAN}, .polar = true}, {"ewa_lanczos", -1, ewa_lanczos, .params = {1.0, NAN}, .polar = true},
{"ewa_hanning", -1, ewa_hanning, .params = {1.0, NAN}, .polar = true}, {"ewa_hanning", -1, ewa_hanning, .params = {1.0, NAN}, .polar = true},
{"ewa_ginseng", -1, ewa_ginseng, .params = {1.0, NAN}, .polar = true}, {"ewa_ginseng", -1, ewa_ginseng, .params = {1.0, NAN}, .polar = true},
// Radius is based on the true jinc radius, slightly sharpened as per
// calculations by Nicolas Robidoux. Source: Imagemagick's magick/resize.c
{"ewa_lanczossharp", 3.2383154841662362, ewa_lanczos,
.params = {0.9812505644269356, NAN}, .polar = true},
{"lanczos", -1, lanczos}, {"lanczos", -1, lanczos},
{"blackman", -1, blackman}, {"blackman", -1, blackman},
{0} {0}