mirror of https://github.com/mpv-player/mpv
57 lines
2.3 KiB
C
57 lines
2.3 KiB
C
/*
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* This file is part of mpv.
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*
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* This file can be distributed under the 3-clause license ("New BSD License").
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*
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* You can alternatively redistribute the non-Glumpy parts of this file and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*/
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#ifndef MPLAYER_FILTER_KERNELS_H
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#define MPLAYER_FILTER_KERNELS_H
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#include <stdbool.h>
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struct filter_window {
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const char *name;
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double radius; // Preferred radius, should only be changed if resizable
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double (*weight)(struct filter_window *k, double x);
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bool resizable; // Filter supports any given radius
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double params[2]; // User-defined custom filter parameters. Not used by
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// all filters
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double blur; // Blur coefficient (sharpens or widens the filter)
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double taper; // Taper coefficient (flattens the filter's center)
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};
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struct filter_kernel {
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struct filter_window f; // the kernel itself
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struct filter_window w; // window storage
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double clamp; // clamping factor, affects negative weights
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double value_cutoff; // discard all contributions below this value (polar)
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// Constant values
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const char *window; // default window
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bool polar; // whether or not the filter uses polar coordinates
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// The following values are set by mp_init_filter() at runtime.
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int size; // number of coefficients (may depend on radius)
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double filter_scale; // Factor to convert the mathematical filter
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// function radius to the possibly wider
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// (in the case of downsampling) filter sample
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// radius.
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double radius_cutoff; // the true radius at which we can cut off the filter
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};
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extern const struct filter_window mp_filter_windows[];
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extern const struct filter_kernel mp_filter_kernels[];
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const struct filter_window *mp_find_filter_window(const char *name);
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const struct filter_kernel *mp_find_filter_kernel(const char *name);
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bool mp_init_filter(struct filter_kernel *filter, const int *sizes,
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double scale);
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void mp_compute_lut(struct filter_kernel *filter, int count, int stride,
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float *out_array);
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#endif /* MPLAYER_FILTER_KERNELS_H */
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