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#include <stdlib.h>
#include "./png.h"
#include "../../error.h"
#include <png.h>
typedef struct
{
unsigned int Width;
unsigned int Height;
unsigned int Depth;
unsigned int Alpha;
unsigned int Components;
unsigned char * Data;
unsigned char * Palette;
} pngRawInfo;
int pngLoadRawF( FILE *fp,pngRawInfo *pinfo )
{
unsigned char header[8];
png_structp png;
png_infop info;
png_infop endinfo;
png_bytep data;
png_bytep * row_p;
png_uint_32 width,height;
int depth,color;
png_uint_32 i;
if ( !pinfo ) return 1;
fread( header,1,8,fp );
if ( !png_check_sig( header,8 ) ) return 1;
png=png_create_read_struct( PNG_LIBPNG_VER_STRING,NULL,NULL,NULL );
info=png_create_info_struct( png );
endinfo=png_create_info_struct( png );
png_init_io( png,fp );
png_set_sig_bytes( png,8 );
png_read_info( png,info );
png_get_IHDR( png,info,&width,&height,&depth,&color,NULL,NULL,NULL );
pinfo->Width=width;
pinfo->Height=height;
pinfo->Depth=depth;
data=( png_bytep ) malloc( png_get_rowbytes( png,info )*height );
row_p=( png_bytep * ) malloc( sizeof( png_bytep )*height );
for ( i=0; i < height; i++ ) row_p[i]=&data[png_get_rowbytes( png,info )*i];
png_read_image( png,row_p );
free( row_p );
if ( color == PNG_COLOR_TYPE_PALETTE )
{
int cols;
png_get_PLTE( png,info,( png_colorp * ) &pinfo->Palette,&cols );
}
else pinfo->Palette=NULL;
if ( color&PNG_COLOR_MASK_ALPHA )
{
if ( color&PNG_COLOR_MASK_PALETTE || color == PNG_COLOR_TYPE_GRAY_ALPHA ) pinfo->Components=2;
else pinfo->Components=4;
pinfo->Alpha=8;
}
else
{
if ( color&PNG_COLOR_MASK_PALETTE || color == PNG_COLOR_TYPE_GRAY ) pinfo->Components=1;
else pinfo->Components=3;
pinfo->Alpha=0;
}
pinfo->Data=data;
png_read_end( png,endinfo );
png_destroy_read_struct( &png,&info,&endinfo );
return 0;
}
int pngLoadRaw( const char * filename,pngRawInfo * pinfo )
{
int result;
FILE *fp=fopen( filename,"rb" );
if ( !fp ) return 1;
result=pngLoadRawF( fp,pinfo );
if ( fclose( fp ) != 0 )
{
if ( result )
{
free( pinfo->Data );
free( pinfo->Palette );
}
return 1;
}
return 0;
}
int pngRead( unsigned char * fname,txSample * bf )
{
pngRawInfo raw;
if ( pngLoadRaw( fname,&raw ) )
{
#ifdef DEBUG
dbprintf( 4,"[png] file read error ( %s ).\n",fname );
#endif
return 1;
}
bf->Width=raw.Width;
bf->Height=raw.Height;
bf->BPP=( raw.Depth * raw.Components ) + raw.Alpha;
bf->ImageSize=bf->Width * bf->Height * ( bf->BPP / 8 );
if ( ( bf->Image=malloc( bf->ImageSize ) ) == NULL )
{
#ifdef DEBUG
dbprintf( 4,"[png] Not enough memory for image buffer.\n" );
#endif
return 2;
}
memcpy( bf->Image,raw.Data,bf->ImageSize );
free( raw.Data );
#ifdef DEBUG
dbprintf( 4,"[png] filename: %s.\n",fname );
dbprintf( 4,"[png] size: %dx%d bits: %d\n",bf->Width,bf->Height,bf->BPP );
dbprintf( 4,"[png] imagesize: %lu\n",bf->ImageSize );
#endif
return 0;
}
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