/* Read a PNG file header into a VIPS header.
*/
int
vips__png_header( const char *name, VipsImage *out )
{
Read *read;
if( !(read = read_new_filename( out, name, FALSE )) ||
png2vips_header( read, out ) )
return( -1 );
return( 0 );
}
/* Read a PNG file header into a VIPS header.
*/
int
vips__png_header( const char *name, VipsImage *out )
{
Read *read;
if( !(read = read_new_filename( out, name, FALSE )) ||
png2vips_header( read, out ) )
return( -1 );
/* Just a header read: we can free the read early and save an fd.
*/
read_destroy( read );
return( 0 );
}
/* Interlaced PNGs need to be entirely decompressed into memory then can be
* served partially from there. Non-interlaced PNGs may be read sequentially.
*/
gboolean
vips__png_isinterlaced( const char *filename )
{
VipsImage *image;
Read *read;
int interlace_type;
image = vips_image_new();
if( !(read = read_new_filename( image, filename, FALSE )) ) {
g_object_unref( image );
return( -1 );
}
interlace_type = png_get_interlace_type( read->pPng, read->pInfo );
g_object_unref( image );
return( interlace_type != PNG_INTERLACE_NONE );
}
int
vips__png_read( const char *filename, VipsImage *out, gboolean readbehind )
{
Read *read;
#ifdef DEBUG
printf( "vips__png_read: reading \"%s\"\n", filename );
#endif /*DEBUG*/
if( !(read = read_new_filename( out, filename, readbehind )) ||
png2vips_image( read, out ) )
return( -1 );
#ifdef DEBUG
printf( "vips__png_read: done\n" );
#endif /*DEBUG*/
return( 0 );
}