/*
 * Guillaume Cottenceau (gc at mandrakesoft.com)
 *
 * Copyright 2002 Mandrakesoft
 *
 * This software may be freely redistributed under the terms of the GNU
 * public license.
 *
 */

#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>

#define PNG_DEBUG 3
#include <png.h>

void abort_(const char * s, ...)
{
	va_list args;
	va_start(args, s);
	vfprintf(stderr, s, args);
	fprintf(stderr, "\n");
	va_end(args);
	abort();
}

int x, y;

int width, height;
png_byte color_type;
png_byte bit_depth;

png_structp png_ptr;
png_infop info_ptr;
int number_of_passes;
png_bytep * row_pointers;

void read_png_file(char* file_name)
{
	char header[8];	// 8 is the maximum size that can be checked

	/* open file and test for it being a png */
	FILE *fp = fopen(file_name, "rb");
	if (!fp)
		abort_("[read_png_file] File %s could not be opened for reading", file_name);
	fread(header, 1, 8, fp);
	if (png_sig_cmp(header, 0, 8))
		abort_("[read_png_file] File %s is not recognized as a PNG file", file_name);


	/* initialize stuff */
	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	
	if (!png_ptr)
		abort_("[read_png_file] png_create_read_struct failed");

	info_ptr = png_create_info_struct(png_ptr);
	if (!info_ptr)
		abort_("[read_png_file] png_create_info_struct failed");

	if (setjmp(png_jmpbuf(png_ptr)))
		abort_("[read_png_file] Error during init_io");

	png_init_io(png_ptr, fp);
	png_set_sig_bytes(png_ptr, 8);

	png_read_info(png_ptr, info_ptr);

	width = info_ptr->width;
	height = info_ptr->height;
	color_type = info_ptr->color_type;
	bit_depth = info_ptr->bit_depth;

	number_of_passes = png_set_interlace_handling(png_ptr);
	png_read_update_info(png_ptr, info_ptr);


	/* read file */
	if (setjmp(png_jmpbuf(png_ptr)))
		abort_("[read_png_file] Error during read_image");

	row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
	for (y=0; y<height; y++)
		row_pointers[y] = (png_byte*) malloc(info_ptr->rowbytes);

	png_read_image(png_ptr, row_pointers);
}


void write_png_file(char* file_name)
{
	/* create file */
	FILE *fp = fopen(file_name, "wb");
	if (!fp)
		abort_("[write_png_file] File %s could not be opened for writing", file_name);


	/* initialize stuff */
	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	
	if (!png_ptr)
		abort_("[write_png_file] png_create_write_struct failed");

	info_ptr = png_create_info_struct(png_ptr);
	if (!info_ptr)
		abort_("[write_png_file] png_create_info_struct failed");

	if (setjmp(png_jmpbuf(png_ptr)))
		abort_("[write_png_file] Error during init_io");

	png_init_io(png_ptr, fp);


	/* write header */
	if (setjmp(png_jmpbuf(png_ptr)))
		abort_("[write_png_file] Error during writing header");

	png_set_IHDR(png_ptr, info_ptr, width, height,
		     bit_depth, color_type, PNG_INTERLACE_NONE,
		     PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);

	png_write_info(png_ptr, info_ptr);


	/* write bytes */
	if (setjmp(png_jmpbuf(png_ptr)))
		abort_("[write_png_file] Error during writing bytes");

	png_write_image(png_ptr, row_pointers);


	/* end write */
	if (setjmp(png_jmpbuf(png_ptr)))
		abort_("[write_png_file] Error during end of write");

	png_write_end(png_ptr, NULL);

}

void process_file(void)
{
	if (info_ptr->color_type != PNG_COLOR_TYPE_RGBA)
		abort_("[process_file] color_type of input file must be PNG_COLOR_TYPE_RGBA (is %d)", info_ptr->color_type);

	for (y=0; y<height; y++) {
		png_byte* row = row_pointers[y];
		for (x=0; x<width; x++) {
			png_byte* ptr = &(row[x*4]);
			ptr[3] = 255-ptr[0];
			ptr[0] = ptr[1] = ptr[2] = 0;
		}
	}

}


int main(int argc, char **argv)
{
	if (argc != 3)
		abort_("Usage: program_name <file_in> <file_out>");

	read_png_file(argv[1]);
	process_file();
	write_png_file(argv[2]);
}
cue-systemd'>user/colin/rescue-systemd</option>
<option value='user/ennael/mga6'>user/ennael/mga6</option>
<option value='user/erwan/bug-13680'>user/erwan/bug-13680</option>
<option value='user/jibz/aarch64'>user/jibz/aarch64</option>
<option value='user/martinw/mga6'>user/martinw/mga6</option>
<option value='user/pterjan/arm64'>user/pterjan/arm64</option>
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<tr><td class='sub'>Mageia Installer and base platform for many utilities</td><td class='sub right'>Thierry Vignaud [tv]</td></tr></table>
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<div class='path'>path: <a href='/software/drakx/commit/?h=14.34&amp;id=4d52b5f0d02193776dc76451b3cee704d1f53cc6'>root</a>/<a href='/software/drakx/commit/perl-install?h=14.34&amp;id=4d52b5f0d02193776dc76451b3cee704d1f53cc6'>perl-install</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='14.34'/><input type='hidden' name='id' value='4d52b5f0d02193776dc76451b3cee704d1f53cc6'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Guillaume Cottenceau &lt;gc@mandriva.com&gt;</td><td class='right'>2003-11-13 12:38:14 +0000</td></tr>
<tr><th>committer</th><td>Guillaume Cottenceau &lt;gc@mandriva.com&gt;</td><td class='right'>2003-11-13 12:38:14 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='sha1'><a href='/software/drakx/commit/perl-install?h=14.34&amp;id=4d52b5f0d02193776dc76451b3cee704d1f53cc6'>4d52b5f0d02193776dc76451b3cee704d1f53cc6</a> (<a href='/software/drakx/patch/perl-install?id=4d52b5f0d02193776dc76451b3cee704d1f53cc6'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='sha1'><a href='/software/drakx/tree/?h=14.34&amp;id=4d52b5f0d02193776dc76451b3cee704d1f53cc6'>0027e93792c0664fea308004566b4a827e97c769</a> /<a href='/software/drakx/tree/perl-install?h=14.34&amp;id=4d52b5f0d02193776dc76451b3cee704d1f53cc6'>perl-install</a></td></tr>
<tr><th>parent</th><td colspan='2' class='sha1'><a href='/software/drakx/commit/perl-install?h=14.34&amp;id=1b02cff44c6217c166413ebc753a89c1abfcef33'>1b02cff44c6217c166413ebc753a89c1abfcef33</a> (<a href='/software/drakx/diff/perl-install?h=14.34&amp;id=4d52b5f0d02193776dc76451b3cee704d1f53cc6&amp;id2=1b02cff44c6217c166413ebc753a89c1abfcef33'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='sha1'><a href='/software/drakx/snapshot/drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar'>drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar</a><br/><a href='/software/drakx/snapshot/drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar.gz'>drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar.gz</a><br/><a href='/software/drakx/snapshot/drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar.bz2'>drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar.bz2</a><br/><a href='/software/drakx/snapshot/drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar.xz'>drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.tar.xz</a><br/><a href='/software/drakx/snapshot/drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.zip'>drakx-4d52b5f0d02193776dc76451b3cee704d1f53cc6.zip</a><br/></td></tr></table>
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