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/*
Copyright (C) 2000 Matthew Danish
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 02111-1307, USA.
*/
#include<GL/gl.h>
#include<stdio.h>
#include"defines.h"
#ifdef PNG_SCREENSHOT
#include<png.h>
#endif
/*
* Thanks go to Andreas Umbach and the creators of glTron for the code
* to write a PNG screenshot in SDL/OpenGL
*
*/
#ifdef PNG_SCREENSHOT
static FILE *_fp;
#endif
bool PNGScreenShot(char *filename) {
#ifdef PNG_SCREENSHOT
void user_write_data(png_structp png_ptr,png_bytep data, png_size_t length);
void user_flush_data(png_structp png_ptr);
unsigned char *data;
png_structp png_ptr;
png_infop info_ptr;
png_byte **row_pointers;
int colortype;
int width, height;
int i;
width = SCREEN_W;
height = SCREEN_H;
data = new unsigned char[width * height * 3];
glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, data);
_fp = fopen(filename, "wb");
if(!_fp) {
fprintf(stderr, "can't open %s for writing\n", filename);
return 0;
}
png_ptr = png_create_write_struct
/* (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn); */
(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if (!png_ptr)
return 0;
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
return 0;
}
/* png_init_io(png_ptr, _fp); */
png_set_write_fn(png_ptr, 0, user_write_data, user_flush_data);
colortype = PNG_COLOR_TYPE_RGB;
png_set_IHDR(png_ptr, info_ptr, width, height,
8, colortype, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_write_info(png_ptr, info_ptr);
/* get pointers */
row_pointers = (png_byte**) new png_byte*[height];
for(i = 0; i < height; i++)
row_pointers[i] = data + (height - i - 1)
* 3 * width;
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
delete row_pointers;
delete data;
fclose(_fp);
fprintf(stderr, "Wrote screenshot to %s\n", filename);
#endif
return 1;
}
#ifdef PNG_SCREENSHOT
void user_write_data(png_structp png_ptr,
png_bytep data, png_size_t length) {
fwrite(data, length, 1, _fp);
}
void user_flush_data(png_structp png_ptr) {
fflush(_fp);
}
#endif
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