/*
  * 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>
 

 /**

  * @file

  * transform input video
  *
  * All matrices are defined as a single 9-item block of contiguous memory. For
  * example, the identity matrix would be:
  *
  *     float *matrix = {1, 0, 0,
  *                      0, 1, 0,
  *                      0, 0, 1};
  */
 
 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
 
 /**
  * Get an affine transformation matrix from a given translation, rotation, and
  * zoom factor. The matrix will look like:
  *
  * [ zoom * cos(angle),           -sin(angle),     x_shift,
  *          sin(angle),     zoom * cos(angle),     y_shift,

  *                   0,                     0,           1 ]

  *

  * @param x_shift horizontal translation
  * @param y_shift vertical translation
  * @param angle   rotation in radians
  * @param zoom    scale percent (1.0 = 100%)
  * @param matrix  9-item affine transformation matrix

  */
 void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom, float *matrix);
 
 /**
  * Add two matrices together. result = m1 + m2.
  *

  * @param m1     9-item transformation matrix
  * @param m2     9-item transformation matrix
  * @param result 9-item transformation matrix

  */
 void avfilter_add_matrix(const float *m1, const float *m2, float *result);
 
 /**
  * Subtract one matrix from another. result = m1 - m2.
  *

  * @param m1     9-item transformation matrix
  * @param m2     9-item transformation matrix
  * @param result 9-item transformation matrix

  */
 void avfilter_sub_matrix(const float *m1, const float *m2, float *result);
 
 /**
  * Multiply a matrix by a scalar value. result = m1 * scalar.
  *

  * @param m1     9-item transformation matrix
  * @param scalar a number
  * @param result 9-item transformation matrix

  */
 void avfilter_mul_matrix(const float *m1, float scalar, float *result);
 
 /**
  * Do an affine transformation with the given interpolation method. This
  * multiplies each vector [x,y,1] by the matrix and then interpolates to
  * get the final value.
  *

  * @param src         source image
  * @param dst         destination image
  * @param src_stride  source image line size in bytes
  * @param dst_stride  destination image line size in bytes
  * @param width       image width in pixels
  * @param height      image height in pixels
  * @param matrix      9-item affine transformation matrix
  * @param interpolate pixel interpolation method
  * @param fill        edge fill method

  * @return negative on error

  */

 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 */