transform.h

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/*
 * Copyright (C) 2010 Georg Martius <georg.martius@web.de>
 * Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFILTER_TRANSFORM_H
#define AVFILTER_TRANSFORM_H

#include <stdint.h>

enum InterpolateMethod {
    INTERPOLATE_NEAREST,        //< Nearest-neighbor (fast)
    INTERPOLATE_BILINEAR,       //< Bilinear
    INTERPOLATE_BIQUADRATIC,    //< Biquadratic (best)
    INTERPOLATE_COUNT,          //< Number of interpolation methods
};

// Shortcuts for the fastest and best interpolation methods
#define INTERPOLATE_DEFAULT INTERPOLATE_BILINEAR
#define INTERPOLATE_FAST    INTERPOLATE_NEAREST
#define INTERPOLATE_BEST    INTERPOLATE_BIQUADRATIC

enum FillMethod {
    FILL_BLANK,         //< Fill zeroes at blank locations
    FILL_ORIGINAL,      //< Original image at blank locations
    FILL_CLAMP,         //< Extruded edge value at blank locations
    FILL_MIRROR,        //< Mirrored edge at blank locations
    FILL_COUNT,         //< Number of edge fill methods
};

// Shortcuts for fill methods
#define FILL_DEFAULT FILL_ORIGINAL

void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom, float *matrix);

void avfilter_add_matrix(const float *m1, const float *m2, float *result);

void avfilter_sub_matrix(const float *m1, const float *m2, float *result);

void avfilter_mul_matrix(const float *m1, float scalar, float *result);

int avfilter_transform(const uint8_t *src, uint8_t *dst,
                        int src_stride, int dst_stride,
                        int width, int height, const float *matrix,
                        enum InterpolateMethod interpolate,
                        enum FillMethod fill);

#endif /* AVFILTER_TRANSFORM_H */