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/*
* This file is part of mpv.
*
* This file can be distributed under the 3-clause license ("New BSD License").
*
* You can alternatively redistribute the non-Glumpy parts of this file and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*/
#ifndef MPLAYER_FILTER_KERNELS_H
#define MPLAYER_FILTER_KERNELS_H
#include <stdbool.h>
enum scaler_filter {
SCALER_INHERIT,
SCALER_BILINEAR,
SCALER_BICUBIC_FAST,
SCALER_OVERSAMPLE,
SCALER_LINEAR,
SCALER_SPLINE16,
SCALER_SPLINE36,
SCALER_SPLINE64,
SCALER_SINC,
SCALER_LANCZOS,
SCALER_GINSENG,
SCALER_JINC,
SCALER_EWA_LANCZOS,
SCALER_EWA_HANNING,
SCALER_EWA_GINSENG,
SCALER_EWA_LANCZOSSHARP,
SCALER_EWA_LANCZOS4SHARPEST,
SCALER_EWA_LANCZOSSOFT,
SCALER_HAASNSOFT,
SCALER_BICUBIC,
SCALER_HERMITE,
SCALER_CATMULL_ROM,
SCALER_MITCHELL,
SCALER_ROBIDOUX,
SCALER_ROBIDOUXSHARP,
SCALER_EWA_ROBIDOUX,
SCALER_EWA_ROBIDOUXSHARP,
SCALER_BOX,
SCALER_NEAREST,
SCALER_TRIANGLE,
SCALER_GAUSSIAN,
WINDOW_PREFERRED,
WINDOW_BOX,
WINDOW_TRIANGLE,
WINDOW_BARTLETT,
WINDOW_COSINE,
WINDOW_HANNING,
WINDOW_TUKEY,
WINDOW_HAMMING,
WINDOW_QUADRIC,
WINDOW_WELCH,
WINDOW_KAISER,
WINDOW_BLACKMAN,
WINDOW_GAUSSIAN,
WINDOW_SINC,
WINDOW_JINC,
WINDOW_SPHINX,
};
struct filter_window {
enum scaler_filter function;
double radius; // Preferred radius, should only be changed if resizable
double (*weight)(struct filter_window *k, double x);
bool resizable; // Filter supports any given radius
double params[2]; // User-defined custom filter parameters. Not used by
// all filters
double blur; // Blur coefficient (sharpens or widens the filter)
double taper; // Taper coefficient (flattens the filter's center)
};
struct filter_kernel {
struct filter_window f; // the kernel itself
struct filter_window w; // window storage
double clamp; // clamping factor, affects negative weights
// Constant values
enum scaler_filter window; // default window
bool polar; // whether or not the filter uses polar coordinates
// The following values are set by mp_init_filter() at runtime.
int size; // number of coefficients (may depend on radius)
double radius; // true filter radius, derived from f.radius and f.blur
double filter_scale; // Factor to convert the mathematical filter
// function radius to the possibly wider
// (in the case of downsampling) filter sample
// radius.
double radius_cutoff; // the radius at which we can cut off the filter
};
extern const struct filter_window mp_filter_windows[];
extern const struct filter_kernel mp_filter_kernels[];
const struct filter_window *mp_find_filter_window(enum scaler_filter function);
const struct filter_kernel *mp_find_filter_kernel(enum scaler_filter function);
bool mp_init_filter(struct filter_kernel *filter, const int *sizes,
double scale);
void mp_compute_lut(struct filter_kernel *filter, int count, int stride,
float *out_array);
#endif /* MPLAYER_FILTER_KERNELS_H */
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