clear to background on init
This commit is contained in:
John Cupitt
parent
e81e7f96eb
commit
b161f4b982
@ -140,300 +140,6 @@ typedef struct {
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WebPIterator iter;
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} Read;
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int
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vips__iswebp_buffer( const void *buf, size_t len )
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{
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/* WebP is "RIFF xxxx WEBP" at the start, so we need 12 bytes.
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*/
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if( len >= 12 &&
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vips_isprefix( "RIFF", (char *) buf ) &&
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vips_isprefix( "WEBP", (char *) buf + 8 ) )
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return( 1 );
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return( 0 );
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}
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int
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vips__iswebp( const char *filename )
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{
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/* Magic number, see above.
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*/
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unsigned char header[12];
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if( vips__get_bytes( filename, header, 12 ) == 12 &&
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vips__iswebp_buffer( header, 12 ) )
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return( 1 );
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return( 0 );
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}
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static int
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read_free( Read *read )
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{
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WebPDemuxReleaseIterator( &read->iter );
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VIPS_UNREF( read->frame );
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VIPS_FREEF( WebPDemuxDelete, read->demux );
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WebPFreeDecBuffer( &read->config.output );
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if( read->fd > 0 &&
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read->data &&
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read->length > 0 ) {
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vips__munmap( read->data, read->length );
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read->data = NULL;
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read->length = 0;
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}
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VIPS_FREEF( vips_tracked_close, read->fd );
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VIPS_FREE( read->filename );
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VIPS_FREE( read );
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return( 0 );
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}
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static Read *
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read_new( const char *filename, const void *data, size_t length,
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int page, int n, int shrink )
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{
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Read *read;
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if( !(read = VIPS_NEW( NULL, Read )) )
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return( NULL );
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read->filename = g_strdup( filename );
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read->data = data;
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read->length = length;
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read->page = page;
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read->n = n;
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read->shrink = shrink;
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read->delay = 100;
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read->fd = 0;
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read->demux = NULL;
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read->frame = NULL;
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if( read->filename ) {
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/* libwebp makes streaming from a file source very hard. We
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* have to read to a full memory buffer, then copy to out.
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*
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* mmap the input file, it's slightly quicker.
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*/
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if( (read->fd = vips__open_image_read( read->filename )) < 0 ||
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(read->length = vips_file_length( read->fd )) < 0 ||
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!(read->data = vips__mmap( read->fd,
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FALSE, read->length, 0 )) ) {
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read_free( read );
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return( NULL );
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}
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}
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WebPInitDecoderConfig( &read->config );
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read->config.options.use_threads = 1;
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read->config.output.is_external_memory = 1;
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return( read );
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}
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/* Map vips metadata names to webp names.
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*/
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const VipsWebPNames vips__webp_names[] = {
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{ VIPS_META_ICC_NAME, "ICCP", ICCP_FLAG },
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{ VIPS_META_EXIF_NAME, "EXIF", EXIF_FLAG },
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{ VIPS_META_XMP_NAME, "XMP ", XMP_FLAG }
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};
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const int vips__n_webp_names = VIPS_NUMBER( vips__webp_names );
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static int
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read_header( Read *read, VipsImage *out )
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{
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WebPData data;
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int canvas_width;
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int canvas_height;
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int flags;
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int i;
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data.bytes = read->data;
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data.size = read->length;
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if( !(read->demux = WebPDemux( &data )) ) {
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vips_error( "webp", "%s", _( "unable to parse image" ) );
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return( -1 );
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}
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canvas_width = WebPDemuxGetI( read->demux, WEBP_FF_CANVAS_WIDTH );
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canvas_height = WebPDemuxGetI( read->demux, WEBP_FF_CANVAS_HEIGHT );
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read->frame_width = canvas_width / read->shrink;
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read->frame_height = canvas_height / read->shrink;
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if( read->shrink > 1 ) {
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read->config.options.use_scaling = 1;
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read->config.options.scaled_width = read->frame_width;
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read->config.options.scaled_height = read->frame_height;
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}
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flags = WebPDemuxGetI( read->demux, WEBP_FF_FORMAT_FLAGS );
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/* FIXME ... do we need to byteswap, or can we use &background as the
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* ink?
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*/
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read->background = WebPDemuxGetI( read->demux,
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WEBP_FF_BACKGROUND_COLOR );
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read->alpha = flags & ALPHA_FLAG;
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if( read->alpha )
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read->config.output.colorspace = MODE_RGBA;
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else
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read->config.output.colorspace = MODE_RGB;
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if( flags & ANIMATION_FLAG ) {
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int loop_count;
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WebPIterator iter;
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loop_count = WebPDemuxGetI( read->demux, WEBP_FF_LOOP_COUNT );
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read->frame_count = WebPDemuxGetI( read->demux,
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WEBP_FF_FRAME_COUNT );
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#ifdef DEBUG
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printf( "webp2vips: animation\n" );
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printf( "webp2vips: loop_count = %d\n", loop_count );
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printf( "webp2vips: frame_count = %d\n", read->frame_count );
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#endif /*DEBUG*/
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vips_image_set_int( out, "gif-loop", loop_count );
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vips_image_set_int( out, "page-height", read->frame_height );
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/* We must get the first frame to get the delay.
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*/
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if( WebPDemuxGetFrame( read->demux, 1, &iter ) ) {
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read->delay = iter.duration;
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#ifdef DEBUG
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printf( "webp2vips: duration = %d\n", read->delay );
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#endif /*DEBUG*/
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vips_image_set_int( out, "gif-delay", read->delay );
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WebPDemuxReleaseIterator( &iter );
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}
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read->width = read->frame_width;
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read->height = read->frame_count * read->frame_height;
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}
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else {
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read->width = read->frame_width;
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read->height = read->frame_height;
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read->frame_count = 1;
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}
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if( read->width <= 0 ||
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read->height <= 0 ) {
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vips_error( "webp", "%s", _( "bad image dimensions" ) );
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return( -1 );
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}
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for( i = 0; i < vips__n_webp_names; i++ ) {
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const char *vips = vips__webp_names[i].vips;
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const char *webp = vips__webp_names[i].webp;
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if( flags & vips__webp_names[i].flags ) {
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WebPChunkIterator iter;
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void *blob;
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WebPDemuxGetChunk( read->demux, webp, 1, &iter );
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if( !(blob = vips_malloc( NULL, iter.chunk.size )) ) {
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WebPDemuxReleaseChunkIterator( &iter );
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return( -1 );
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}
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memcpy( blob, iter.chunk.bytes, iter.chunk.size );
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vips_image_set_blob( out, vips,
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(VipsCallbackFn) vips_free,
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blob, iter.chunk.size );
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WebPDemuxReleaseChunkIterator( &iter );
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}
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}
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read->frame = vips_image_new_memory();
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vips_image_init_fields( read->frame,
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read->frame_width, read->frame_height,
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read->alpha ? 4 : 3,
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
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VIPS_INTERPRETATION_sRGB,
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1.0, 1.0 );
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vips_image_pipelinev( read->frame, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
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if( vips_image_write_prepare( read->frame ) )
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return( -1 );
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vips_image_init_fields( out,
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read->width, read->height,
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read->alpha ? 4 : 3,
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
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VIPS_INTERPRETATION_sRGB,
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1.0, 1.0 );
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vips_image_pipelinev( out, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
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if( !WebPDemuxGetFrame( read->demux, 1, &read->iter ) ) {
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vips_error( "webp",
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"%s", _( "unable to loop through frames" ) );
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return( -1 );
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}
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return( 0 );
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}
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int
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vips__webp_read_file_header( const char *filename, VipsImage *out,
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int page, int n, int shrink )
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{
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Read *read;
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if( !(read = read_new( filename, NULL, 0, page, n, shrink )) ) {
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vips_error( "webp2vips",
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_( "unable to open \"%s\"" ), filename );
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return( -1 );
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}
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if( read_header( read, out ) ) {
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read_free( read );
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return( -1 );
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}
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read_free( read );
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return( 0 );
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}
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static VipsImage *
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read_frame( Read *read,
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int width, int height, const uint8_t *data, size_t length )
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{
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VipsImage *frame;
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frame = vips_image_new_memory();
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vips_image_init_fields( frame,
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width, height,
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read->alpha ? 4 : 3,
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
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VIPS_INTERPRETATION_sRGB,
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1.0, 1.0 );
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vips_image_pipelinev( frame, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
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if( vips_image_write_prepare( frame ) ) {
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g_object_unref( frame );
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return( NULL );
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}
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read->config.output.u.RGBA.rgba = VIPS_IMAGE_ADDR( frame, 0, 0 );
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read->config.output.u.RGBA.stride = VIPS_IMAGE_SIZEOF_LINE( frame );
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read->config.output.u.RGBA.size = VIPS_IMAGE_SIZEOF_IMAGE( frame );
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if( WebPDecode( data, length, &read->config ) != VP8_STATUS_OK ) {
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g_object_unref( frame );
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vips_error( "webp2vips", "%s", _( "unable to read pixels" ) );
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return( NULL );
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}
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return( frame );
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}
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static void
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vips_image_paint_pel( VipsImage *image, const VipsRect *r, const VipsPel *ink )
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{
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@ -558,6 +264,308 @@ vips_image_paint_image( VipsImage *image,
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}
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}
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int
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vips__iswebp_buffer( const void *buf, size_t len )
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{
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/* WebP is "RIFF xxxx WEBP" at the start, so we need 12 bytes.
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*/
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if( len >= 12 &&
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vips_isprefix( "RIFF", (char *) buf ) &&
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vips_isprefix( "WEBP", (char *) buf + 8 ) )
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return( 1 );
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return( 0 );
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}
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int
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vips__iswebp( const char *filename )
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{
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/* Magic number, see above.
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*/
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unsigned char header[12];
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if( vips__get_bytes( filename, header, 12 ) == 12 &&
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vips__iswebp_buffer( header, 12 ) )
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return( 1 );
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return( 0 );
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}
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static int
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read_free( Read *read )
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{
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WebPDemuxReleaseIterator( &read->iter );
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VIPS_UNREF( read->frame );
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VIPS_FREEF( WebPDemuxDelete, read->demux );
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WebPFreeDecBuffer( &read->config.output );
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if( read->fd > 0 &&
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read->data &&
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read->length > 0 ) {
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vips__munmap( read->data, read->length );
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read->data = NULL;
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read->length = 0;
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}
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VIPS_FREEF( vips_tracked_close, read->fd );
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VIPS_FREE( read->filename );
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VIPS_FREE( read );
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return( 0 );
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}
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static Read *
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read_new( const char *filename, const void *data, size_t length,
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int page, int n, int shrink )
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{
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Read *read;
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if( !(read = VIPS_NEW( NULL, Read )) )
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return( NULL );
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read->filename = g_strdup( filename );
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read->data = data;
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read->length = length;
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read->page = page;
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read->n = n;
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read->shrink = shrink;
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read->delay = 100;
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read->fd = 0;
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read->demux = NULL;
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read->frame = NULL;
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if( read->filename ) {
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/* libwebp makes streaming from a file source very hard. We
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* have to read to a full memory buffer, then copy to out.
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*
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* mmap the input file, it's slightly quicker.
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*/
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if( (read->fd = vips__open_image_read( read->filename )) < 0 ||
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(read->length = vips_file_length( read->fd )) < 0 ||
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!(read->data = vips__mmap( read->fd,
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FALSE, read->length, 0 )) ) {
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read_free( read );
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return( NULL );
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}
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}
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WebPInitDecoderConfig( &read->config );
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read->config.options.use_threads = 1;
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read->config.output.is_external_memory = 1;
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return( read );
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}
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/* Map vips metadata names to webp names.
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*/
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const VipsWebPNames vips__webp_names[] = {
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{ VIPS_META_ICC_NAME, "ICCP", ICCP_FLAG },
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{ VIPS_META_EXIF_NAME, "EXIF", EXIF_FLAG },
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{ VIPS_META_XMP_NAME, "XMP ", XMP_FLAG }
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};
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const int vips__n_webp_names = VIPS_NUMBER( vips__webp_names );
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static int
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read_header( Read *read, VipsImage *out )
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{
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WebPData data;
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int canvas_width;
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int canvas_height;
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int flags;
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int i;
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VipsRect area;
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data.bytes = read->data;
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data.size = read->length;
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if( !(read->demux = WebPDemux( &data )) ) {
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vips_error( "webp", "%s", _( "unable to parse image" ) );
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return( -1 );
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}
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canvas_width = WebPDemuxGetI( read->demux, WEBP_FF_CANVAS_WIDTH );
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canvas_height = WebPDemuxGetI( read->demux, WEBP_FF_CANVAS_HEIGHT );
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read->frame_width = canvas_width / read->shrink;
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read->frame_height = canvas_height / read->shrink;
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if( read->shrink > 1 ) {
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read->config.options.use_scaling = 1;
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read->config.options.scaled_width = read->frame_width;
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read->config.options.scaled_height = read->frame_height;
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}
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flags = WebPDemuxGetI( read->demux, WEBP_FF_FORMAT_FLAGS );
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/* FIXME ... do we need to byteswap, or can we use &background as the
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* ink?
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*/
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read->background = WebPDemuxGetI( read->demux,
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WEBP_FF_BACKGROUND_COLOR );
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read->alpha = flags & ALPHA_FLAG;
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if( read->alpha )
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read->config.output.colorspace = MODE_RGBA;
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else
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read->config.output.colorspace = MODE_RGB;
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if( flags & ANIMATION_FLAG ) {
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int loop_count;
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WebPIterator iter;
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loop_count = WebPDemuxGetI( read->demux, WEBP_FF_LOOP_COUNT );
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read->frame_count = WebPDemuxGetI( read->demux,
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WEBP_FF_FRAME_COUNT );
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#ifdef DEBUG
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printf( "webp2vips: animation\n" );
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printf( "webp2vips: loop_count = %d\n", loop_count );
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printf( "webp2vips: frame_count = %d\n", read->frame_count );
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#endif /*DEBUG*/
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vips_image_set_int( out, "gif-loop", loop_count );
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vips_image_set_int( out, "page-height", read->frame_height );
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/* We must get the first frame to get the delay.
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*/
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if( WebPDemuxGetFrame( read->demux, 1, &iter ) ) {
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read->delay = iter.duration;
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#ifdef DEBUG
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printf( "webp2vips: duration = %d\n", read->delay );
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#endif /*DEBUG*/
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vips_image_set_int( out, "gif-delay", read->delay );
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WebPDemuxReleaseIterator( &iter );
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}
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read->width = read->frame_width;
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read->height = read->frame_count * read->frame_height;
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}
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else {
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read->width = read->frame_width;
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read->height = read->frame_height;
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read->frame_count = 1;
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}
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if( read->width <= 0 ||
|
||||
read->height <= 0 ) {
|
||||
vips_error( "webp", "%s", _( "bad image dimensions" ) );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
for( i = 0; i < vips__n_webp_names; i++ ) {
|
||||
const char *vips = vips__webp_names[i].vips;
|
||||
const char *webp = vips__webp_names[i].webp;
|
||||
|
||||
if( flags & vips__webp_names[i].flags ) {
|
||||
WebPChunkIterator iter;
|
||||
void *blob;
|
||||
|
||||
WebPDemuxGetChunk( read->demux, webp, 1, &iter );
|
||||
|
||||
if( !(blob = vips_malloc( NULL, iter.chunk.size )) ) {
|
||||
WebPDemuxReleaseChunkIterator( &iter );
|
||||
return( -1 );
|
||||
}
|
||||
memcpy( blob, iter.chunk.bytes, iter.chunk.size );
|
||||
vips_image_set_blob( out, vips,
|
||||
(VipsCallbackFn) vips_free,
|
||||
blob, iter.chunk.size );
|
||||
|
||||
WebPDemuxReleaseChunkIterator( &iter );
|
||||
}
|
||||
}
|
||||
|
||||
read->frame = vips_image_new_memory();
|
||||
vips_image_init_fields( read->frame,
|
||||
read->frame_width, read->frame_height,
|
||||
read->alpha ? 4 : 3,
|
||||
VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
|
||||
VIPS_INTERPRETATION_sRGB,
|
||||
1.0, 1.0 );
|
||||
vips_image_pipelinev( read->frame, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
|
||||
|
||||
if( vips_image_write_prepare( read->frame ) )
|
||||
return( -1 );
|
||||
|
||||
area.left = 0;
|
||||
area.top = 0;
|
||||
area.width = read->frame_width;
|
||||
area.height = read->frame_height;
|
||||
vips_image_paint_pel( read->frame,
|
||||
&area, (VipsPel *) &read->background );
|
||||
|
||||
vips_image_init_fields( out,
|
||||
read->width, read->height,
|
||||
read->alpha ? 4 : 3,
|
||||
VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
|
||||
VIPS_INTERPRETATION_sRGB,
|
||||
1.0, 1.0 );
|
||||
vips_image_pipelinev( out, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
|
||||
|
||||
if( !WebPDemuxGetFrame( read->demux, 1, &read->iter ) ) {
|
||||
vips_error( "webp",
|
||||
"%s", _( "unable to loop through frames" ) );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
int
|
||||
vips__webp_read_file_header( const char *filename, VipsImage *out,
|
||||
int page, int n, int shrink )
|
||||
{
|
||||
Read *read;
|
||||
|
||||
if( !(read = read_new( filename, NULL, 0, page, n, shrink )) ) {
|
||||
vips_error( "webp2vips",
|
||||
_( "unable to open \"%s\"" ), filename );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
if( read_header( read, out ) ) {
|
||||
read_free( read );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
read_free( read );
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
static VipsImage *
|
||||
read_frame( Read *read,
|
||||
int width, int height, const uint8_t *data, size_t length )
|
||||
{
|
||||
VipsImage *frame;
|
||||
|
||||
frame = vips_image_new_memory();
|
||||
vips_image_init_fields( frame,
|
||||
width, height,
|
||||
read->alpha ? 4 : 3,
|
||||
VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
|
||||
VIPS_INTERPRETATION_sRGB,
|
||||
1.0, 1.0 );
|
||||
vips_image_pipelinev( frame, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
|
||||
|
||||
if( vips_image_write_prepare( frame ) ) {
|
||||
g_object_unref( frame );
|
||||
return( NULL );
|
||||
}
|
||||
|
||||
read->config.output.u.RGBA.rgba = VIPS_IMAGE_ADDR( frame, 0, 0 );
|
||||
read->config.output.u.RGBA.stride = VIPS_IMAGE_SIZEOF_LINE( frame );
|
||||
read->config.output.u.RGBA.size = VIPS_IMAGE_SIZEOF_IMAGE( frame );
|
||||
|
||||
if( WebPDecode( data, length, &read->config ) != VP8_STATUS_OK ) {
|
||||
g_object_unref( frame );
|
||||
vips_error( "webp2vips", "%s", _( "unable to read pixels" ) );
|
||||
return( NULL );
|
||||
}
|
||||
|
||||
return( frame );
|
||||
}
|
||||
|
||||
static int
|
||||
read_next_frame( Read *read )
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user