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/**
* 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
/**
* Stop when `try_alt_fbpath` (in scrotty.c) reaches this value.
*/
extern const int alt_fbpath_limit;
/**
* This is called if no framebuffer is found.
*
* It prints a message describing this condition
* and suggests how to resolve it.
*/
void print_not_found_help (void);
/**
* Construct the path to a framebuffer device.
*
* @param altpath The index of the alternative path-pattern to use.
* @param fbno The index of the framebuffer.
* @return The path to the framebuffer device. Errors are impossible.
* This string is statically allocated and must not be deallocated.
*/
char *get_fbpath (int altpath, int fbno);
/**
* Get the dimensions of a framebuffer.
*
* @param fbno The number of the framebuffer.
* @param fbfd File descriptor for framebuffer device.
* @param width Output parameter for the width of the image.
* @param height Output parameter for the height of the image.
* @parma data Additional data to pass to `convert_fb_to_png`.
* @return Zero on success, -1 on error.
*/
int measure (int fbno, int fbfd, long *restrict width, long *restrict height, void **restrict data);
/**
* Convert read data from a framebuffer to PNG pixel data.
*
* @param file The output image file.
* @param buf Buffer with read data.
* @param n The number of read characters.
* @param width3 The width of the image multipled by 3.
* @param adjustment Set to zero if all bytes were converted
* (a whole number of pixels where available,)
* otherwise, set to the number of bytes a
* pixel is encoded.
* @param state Use this to keep track of where in the you
* stopped. It will be 0 on the first call.
* @param data Data from `measure`.
* @return Zero on success, -1 on error.
*/
int convert_fb_to_png (png_struct *pngbuf, png_byte *restrict pixbuf, const char *restrict buf,
size_t n, long width3, size_t *restrict adjustment, long *restrict state,
void *restrict data);
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