/**
* scrotty — Screenshot program for Linux's TTY
*
* Copyright © 2014, 2015 Mattias Andrée (maandree@member.fsf.org)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifdef __GNUC__
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wpadded"
#endif
#include <png.h>
#ifdef __GNUC__
# pragma GCC diagnostic pop
#endif
/**
* Store a pixel to a PNG row buffer.
*
* @param PIXBUF:png_byte * The pixel buffer for the row.
* @param X3:long The column of the pixel multipled by 3.
* @param R:int The [0, 255]-value on the red subpixel.
* @param G:int The [0, 255]-value on the green subpixel.
* @param B:int The [0, 255]-value on the blue subpixel.
*/
#define SAVE_PNG_PIXEL(PIXBUF, X3, R, G, B) \
((PIXBUF)[(X3) + 0] = (png_byte)(R), \
(PIXBUF)[(X3) + 1] = (png_byte)(G), \
(PIXBUF)[(X3) + 2] = (png_byte)(B))
/**
* Store a row to a PNG image.
*
* @param PNGBUF:png_struct * The PNG image structure.
* @param PIXBUF:png_byte * The pixel buffer for the row.
*/
#define SAVE_PNG_ROW(PNGBUF, PIXBUF) \
png_write_row (PNGBUF, PIXBUF)
/**
* Create an PNG file.
*
* @param fbfd The file descriptor connected to framebuffer device.
* @param width The width of the image.
* @param height The height of the image.
* @param imgfd The file descriptor connected to conversion process's stdin.
* @param data Additional data for `convert_fb_to_pnm`
* and `convert_fb_to_png`.
* @return Zero on success, -1 on error.
*/
int
save_png (int fbfd, long width, long height, int imgfd, void *restrict data);
