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/******************************************************************************
*
*
*
*
* Copyright (C) 1997-2001 by Dimitri van Heesch.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation under the terms of the GNU General Public License is hereby
* granted. No representations are made about the suitability of this software
* for any purpose. It is provided "as is" without express or implied warranty.
* See the GNU General Public License for more details.
*
* Documents produced by Doxygen are derivative works derived from the
* input used in their production; they are not affected by this license.
*
* ---------------------------------------------------------------------------
*
* The Portable Network Graphic format is an ISO Standard.
* Most of the code below was donated by Bernhard Ristow.
*/
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
#include <png.h>
#include <stdio.h>
#include <malloc.h>
#include "pngenc.h"
#include "message.h"
static void user_error_fn(png_structp, png_const_charp error_msg)
{
err("%s\n", error_msg);
}
static void user_warning_fn(png_structp, png_const_charp warning_msg)
{
err("%s\n", warning_msg);
}
PngEncoder::PngEncoder(Byte *rawBytes, Color *p, int w, int h, Byte d, int t) :
data(rawBytes), palette(p), width(w), height(h), depth(d), transIndex(t)
{
numPixels = w*h;
dataPtr = data;
}
PngEncoder::~PngEncoder()
{
}
void PngEncoder::write(const char *name)
{
FILE * file = NULL;
unsigned char ** rows = 0;
unsigned char * cmap = 0;
short numOfColors = (1<<depth);
short bit_depth = 4;
long i = 0;
long j = 0;
png_structp png_ptr;
png_infop info_ptr;
char user_error_ptr[] = "PngEncoder";
png_colorp png_palette;
png_byte ti[1];
png_ptr = png_create_write_struct
( PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
{
err("Can not allocate writing structure!\n");
return;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
err("Can not allocate writing structure!\n");
return;
}
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
else
{
png_palette = (png_colorp) png_malloc(png_ptr,
PNG_MAX_PALETTE_LENGTH*sizeof(png_color));
memset(png_palette,0,PNG_MAX_PALETTE_LENGTH*sizeof(png_color));
for (i=0; i<numOfColors; i++)
{
png_palette[i].red = palette[i].red;
png_palette[i].green = palette[i].green;
png_palette[i].blue = palette[i].blue;
}
png_set_PLTE(png_ptr, info_ptr, png_palette, PNG_MAX_PALETTE_LENGTH);
png_set_IHDR( png_ptr, info_ptr, width, height, bit_depth,
PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE
);
ti[0] = transIndex;
png_set_tRNS(png_ptr,info_ptr,ti,1,NULL);
rows = (unsigned char **) calloc(sizeof(unsigned char*),height);
rows[0] = (unsigned char *) calloc(sizeof(unsigned char),height*width);
for (i=1; i<height; i++)
{
rows[i] = rows[i-1] + width;
}
for (i=0, dataPtr=data; i<height; i++)
{
for (j=0; j<width; j++)
{
if (j%2)
{
rows[i][j/2] = ( rows[i][j/2] | *dataPtr );
}
else
{
rows[i][j/2] = (*dataPtr) << 4;
}
dataPtr++;
}
}
png_set_rows(png_ptr,info_ptr,rows);
file = fopen(name,"wb");
png_init_io(png_ptr,file);
png_write_png(png_ptr,info_ptr,PNG_TRANSFORM_IDENTITY,NULL);
}
png_destroy_write_struct(&png_ptr, &info_ptr);
if (file)
{
fclose (file);
}
if (cmap)
{
free(cmap);
}
if (rows)
{
if (rows[0])
{
free(rows[0]);
}
free(rows);
}
return;
}
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