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/* jp2tools.h
* Auxiliary routines for jp2 processing.
*
* Ziproxy - the HTTP acceleration proxy
* This code is under the following conditions:
*
* ---------------------------------------------------------------------
* Copyright (c)2005-2021 Daniel Mealha Cabrita
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
* ---------------------------------------------------------------------
*/
#ifndef SRC_JP2TOOLS_H
#define SRC_JP2TOOLS_H
/* types used externally */
enum enum_upsampler {UPS_LINEAR, UPS_LANCZOS};
#define t_upsampler enum enum_upsampler
// FIXME: this shouldn't be necessary as it's redundant, but won't compile otherwise
extern t_upsampler JP2Upsampler;
int return_downscaled_array_len (const int width, const int xpos, const int xstep);
void jp2_downsample_image_components (unsigned char *bitmap, const int width, const int height, const int bpp, const int *csampling, int *csampling_effective, int *cwidth, int *cheight);
void jp2_upsample_image_components (unsigned char *bitmap, const int width, const int height, const int bpp, const int *csampling, const int *cwidth, const int *cheight);
/* PRIVATE */
void upsample_component_line_lanczos (const float *x_in_buff, float *x_out_buff, float *weight_x_out_buff, const float *x_contrib, const int x_contrib_size, const int width, const int xpos, const int xstep, const int compressed_width);
void upsample_component_lanczos (unsigned char *carray, int width, int height, const int xpos, const int ypos, const int xstep, const int ystep);
#endif
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