static int
read_image( Read *read, VipsImage *out )
{
VipsImage **t = (VipsImage **)
vips_object_local_array( VIPS_OBJECT( out ), 3 );
guint64 length;
void *data;
int fd;
webp_decoder decoder;
/* libwebp makes streaming very hard. We have to read to a full memory
* buffer, then copy to out.
*
* mmap the input file, it's slightly quicker.
*/
t[0] = vips_image_new_buffer();
if( read_header( read, t[0] ) )
return( -1 );
if( vips_image_write_prepare( t[0] ) )
return( -1 );
if( !(fd = vips__open_image_read( read->filename )) )
return( -1 );
if( (length = vips_file_length( fd )) < 0 ) {
vips_tracked_close( fd );
return( -1 );
}
if( !(data = vips__mmap( fd, FALSE, length, 0 )) ) {
vips_tracked_close( fd );
return( -1 );
}
if( t[0]->Bands == 3 )
decoder = WebPDecodeRGBInto;
else
decoder = WebPDecodeRGBAInto;
if( !decoder( (uint8_t *) data, length,
VIPS_IMAGE_ADDR( t[0], 0, 0 ),
VIPS_IMAGE_SIZEOF_IMAGE( t[0] ),
VIPS_IMAGE_SIZEOF_LINE( t[0] ) ) ) {
vips__munmap( data, length );
vips_tracked_close( fd );
vips_error( "webp2vips", "%s", _( "unable to read pixels" ) );
return( -1 );
}
vips__munmap( data, length );
vips_tracked_close( fd );
if( vips_image_write( t[0], out ) )
return( -1 );
return( 0 );
}
static Read *
read_new( const char *filename, void *data, size_t length )
{
Read *read;
if( !(read = VIPS_NEW( NULL, Read )) )
return( NULL );
read->filename = g_strdup( filename );
read->data = data;
read->length = length;
read->fd = 0;
read->idec = NULL;
if( read->filename ) {
/* libwebp makes streaming from a file source very hard. We
* have to read to a full memory buffer, then copy to out.
*
* mmap the input file, it's slightly quicker.
*/
if( (read->fd = vips__open_image_read( read->filename )) < 0 ||
(read->length = vips_file_length( read->fd )) < 0 ||
!(read->data = vips__mmap( read->fd,
FALSE, read->length, 0 )) ) {
read_free( read );
return( NULL );
}
}
WebPInitDecoderConfig( &read->config );
if( WebPGetFeatures( read->data, MINIMAL_HEADER,
&read->config.input ) != VP8_STATUS_OK ) {
read_free( read );
return( NULL );
}
if( read->config.input.has_alpha )
read->config.output.colorspace = MODE_RGBA;
else
read->config.output.colorspace = MODE_RGB;
read->config.options.use_threads = TRUE;
return( read );
}
static Read *
read_new( const char *filename, const void *data, size_t length, int shrink )
{
Read *read;
if( !(read = VIPS_NEW( NULL, Read )) )
return( NULL );
read->filename = g_strdup( filename );
read->data = data;
read->length = length;
read->shrink = shrink;
read->fd = 0;
read->idec = NULL;
if( read->filename ) {
/* libwebp makes streaming from a file source very hard. We
* have to read to a full memory buffer, then copy to out.
*
* mmap the input file, it's slightly quicker.
*/
if( (read->fd = vips__open_image_read( read->filename )) < 0 ||
(read->length = vips_file_length( read->fd )) < 0 ||
!(read->data = vips__mmap( read->fd,
FALSE, read->length, 0 )) ) {
read_free( read );
return( NULL );
}
}
WebPInitDecoderConfig( &read->config );
if( WebPGetFeatures( read->data, MINIMAL_HEADER,
&read->config.input ) != VP8_STATUS_OK ) {
read_free( read );
return( NULL );
}
if( read->config.input.has_alpha )
read->config.output.colorspace = MODE_RGBA;
else
read->config.output.colorspace = MODE_RGB;
read->config.options.use_threads = 1;
read->width = read->config.input.width / read->shrink;
read->height = read->config.input.height / read->shrink;
if( read->width == 0 ||
read->height == 0 ) {
vips_error( "webp", "%s", _( "bad setting for shrink" ) );
return( NULL );
}
if( read->shrink > 1 ) {
read->config.options.use_scaling = 1;
read->config.options.scaled_width = read->width;
read->config.options.scaled_height = read->height;
}
return( read );
}
