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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it 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.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MP_GL_ERROR_DIFFUSION
#define MP_GL_ERROR_DIFFUSION
#include "shader_cache.h"
// defines the border of all error diffusion kernels
#define EF_MIN_DELTA_X (-2)
#define EF_MAX_DELTA_X (2)
#define EF_MAX_DELTA_Y (2)
struct error_diffusion_kernel {
const char *name;
// The minimum value such that a (y, x) -> (y, x + y * shift) mapping will
// make all error pushing operations affect next column (and after it) only.
int shift;
// The diffusion factor for (y, x) is pattern[y][x - EF_MIN_DELTA_X] / divisor.
int pattern[EF_MAX_DELTA_Y + 1][EF_MAX_DELTA_X - EF_MIN_DELTA_X + 1];
int divisor;
};
extern const struct error_diffusion_kernel mp_error_diffusion_kernels[];
const struct error_diffusion_kernel *mp_find_error_diffusion_kernel(const char *name);
int mp_ef_compute_shared_memory_size(const struct error_diffusion_kernel *k, int height);
void pass_error_diffusion(struct gl_shader_cache *sc,
const struct error_diffusion_kernel *k,
int tex, int width, int height, int depth, int block_size);
#endif /* MP_GL_ERROR_DIFFUSION */
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