John Cupitt
parent
7037377f15
commit
e12b44e790
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@ -134,26 +134,6 @@ typedef struct _VipsForeignLoadGif {
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GifFileType *file;
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/* The current read position, in pages.
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*/
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int current_page;
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/* Set for EOF detected.
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*
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* FIXME ... do we need this?
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*
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*/
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gboolean eof;
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/* As we scan the file, the index of the transparent pixel for this
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* frame.
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*/
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int transparency;
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/* Decompress lines of the gif file to here.
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*/
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GifPixelType *line;
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/* We decompress the whole thing to a huge RGBA memory image, and
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* as we render, watch for bands and transparency. At the end of
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* loading, we copy 1 or 3 bands, with or without transparency to
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@ -177,10 +157,35 @@ typedef struct _VipsForeignLoadGif {
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*/
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char *comment;
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/* A memory image the sized of one frame ... we accumulate to this as
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* we scan the image, and copy lines to the output on generate.
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*/
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VipsImage *frame;
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/* The position of @frame, in pages.
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*/
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int current_page;
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/* Decompress lines of the gif file to here.
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*/
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GifPixelType *line;
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/* The current dispose method.
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*/
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int dispose;
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/* Set for EOF detected.
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*
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* FIXME ... do we need this?
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*
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*/
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gboolean eof;
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/* As we scan the file, the index of the transparent pixel for this
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* frame.
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*/
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int transparency;
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/* Params for DGifOpen(). Set by subclasses, called by base class in
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* _open().
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*/
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@ -317,6 +322,7 @@ vips_foreign_load_gif_dispose( GObject *gobject )
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vips_foreign_load_gif_close( gif );
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VIPS_FREE( gif->comment );
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VIPS_UNREF( gif->frame );
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G_OBJECT_CLASS( vips_foreign_load_gif_parent_class )->
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dispose( gobject );
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@ -363,6 +369,297 @@ vips_foreign_load_gif_is_a( const char *filename )
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return( 0 );
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}
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static int
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vips_foreign_load_gif_ext_next( VipsForeignLoadGif *gif,
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GifByteType **extension )
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{
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if( DGifGetExtensionNext( gif->file, extension ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( *extension )
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VIPS_DEBUG_MSG( "gifload: EXTENSION_NEXT\n" );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_code_next( VipsForeignLoadGif *gif,
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GifByteType **extension )
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{
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if( DGifGetCodeNext( gif->file, extension ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( *extension )
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VIPS_DEBUG_MSG( "gifload: CODE_NEXT\n" );
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return( 0 );
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}
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/* Quickly scan an image record.
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*/
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static int
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vips_foreign_load_gif_scan_image_record( VipsForeignLoadGif *gif )
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{
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GifFileType *file = gif->file;
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ColorMapObject *map = file->Image.ColorMap ?
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file->Image.ColorMap : file->SColorMap;
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GifByteType *extension;
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/* Test for a non-greyscale colourmap for this frame.
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*/
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if( !gif->has_colour &&
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map ) {
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int i;
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for( i = 0; i < map->ColorCount; i++ )
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if( map->Colors[i].Red != map->Colors[i].Green ||
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map->Colors[i].Green != map->Colors[i].Blue ) {
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printf( "gifload: not mono\n" );
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gif->has_colour = TRUE;
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break;
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}
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}
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/* Step over compressed image data.
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*/
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do {
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if( vips_foreign_load_gif_code_next( gif, &extension ) )
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return( -1 );
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} while( extension != NULL );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_scan_application_ext( VipsForeignLoadGif *gif,
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GifByteType *extension )
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{
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gboolean have_netscape;
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printf( "gifload: type: application\n" );
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/* The 11-byte NETSCAPE extension.
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*/
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have_netscape = FALSE;
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if( extension[0] == 11 &&
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vips_isprefix( "NETSCAPE2.0", (const char*) (extension + 1) ) )
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have_netscape = TRUE;
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while( extension != NULL ) {
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if( vips_foreign_load_gif_ext_next( gif, &extension ) )
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return( -1 );
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if( have_netscape &&
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extension &&
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extension[0] == 3 &&
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extension[1] == 1 ) {
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gif->loop = extension[2] | (extension[3] << 8);
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printf( "gifload: seen loop %d\n",
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gif->loop );
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}
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}
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return( 0 );
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}
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static int
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vips_foreign_load_gif_scan_comment_ext( VipsForeignLoadGif *gif,
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GifByteType *extension )
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{
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VIPS_DEBUG_MSG( "gifload: type: comment\n" );
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if( !gif->comment ) {
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/* Up to 257 with a NULL terminator.
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*/
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char comment[257];
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vips_strncpy( comment, (char *) (extension + 1), 256 );
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comment[extension[0]] = '\0';
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gif->comment = g_strdup( comment );
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}
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while( extension != NULL )
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if( vips_foreign_load_gif_ext_next( gif, &extension ) )
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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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vips_foreign_load_gif_scan_extension( VipsForeignLoadGif *gif )
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{
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GifByteType *extension;
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int ext_code;
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printf( "gifload: EXTENSION_RECORD_TYPE\n" );
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if( DGifGetExtension( gif->file, &ext_code, &extension ) ==
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GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( extension )
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switch( ext_code ) {
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case GRAPHICS_EXT_FUNC_CODE:
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if( extension[0] == 4 &&
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extension[1] & 0x1 )
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gif->has_transparency = TRUE;
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if( !gif->has_delay ) {
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gif->has_delay = TRUE;
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gif->delay = extension[2] | (extension[3] << 8);
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}
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while( extension != NULL )
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if( vips_foreign_load_gif_ext_next( gif,
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&extension ) )
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return( -1 );
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break;
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case APPLICATION_EXT_FUNC_CODE:
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if( vips_foreign_load_gif_scan_application_ext( gif,
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extension ) )
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return( -1 );
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break;
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case COMMENT_EXT_FUNC_CODE:
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if( vips_foreign_load_gif_scan_comment_ext( gif,
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extension ) )
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return( -1 );
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break;
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default:
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/* Step over any NEXT blocks for unknown extensions.
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*/
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while( extension != NULL )
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if( vips_foreign_load_gif_ext_next( gif,
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&extension ) )
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return( -1 );
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break;
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}
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return( 0 );
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}
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/* Attempt to quickly scan a GIF and discover:
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* - number of frames (pages)
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* - mono or colour (check colourmap on each page)
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* - has transparency (check bit in ext block on every page)
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*/
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static int
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vips_foreign_load_gif_header( VipsForeignLoad *load )
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{
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VipsForeignLoadGifClass *class =
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(VipsForeignLoadGifClass *) VIPS_OBJECT_GET_CLASS( load );
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VipsForeignLoadGif *gif = (VipsForeignLoadGif *) load;
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GifRecordType record;
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int n_pages;
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printf( "vips_foreign_load_gif_header:\n" );
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if( class->open( gif ) )
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return( -1 );
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printf( "vips_foreign_load_gif_header: starting page scan\n" );
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n_pages = 0;
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do {
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if( DGifGetRecordType( gif->file, &record ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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switch( record ) {
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case IMAGE_DESC_RECORD_TYPE:
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printf( "gifload: IMAGE_DESC_RECORD_TYPE\n" );
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if( DGifGetImageDesc( gif->file ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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/* Read in the image record.
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*/
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if( vips_foreign_load_gif_scan_image_record( gif ) )
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return( -1 );
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n_pages += 1;
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break;
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case EXTENSION_RECORD_TYPE:
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/* We will need to fetch the extensions to check for
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* cmaps and transparency.
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*/
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if( vips_foreign_load_gif_scan_extension( gif ) )
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return( -1 );
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break;
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case TERMINATE_RECORD_TYPE:
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printf( "gifload: TERMINATE_RECORD_TYPE\n" );
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gif->eof = TRUE;
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break;
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case SCREEN_DESC_RECORD_TYPE:
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printf( "gifload: SCREEN_DESC_RECORD_TYPE\n" );
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break;
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case UNDEFINED_RECORD_TYPE:
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printf( "gifload: UNDEFINED_RECORD_TYPE\n" );
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break;
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default:
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break;
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}
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} while( !gif->eof );
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printf( "vips_foreign_load_gif_header: found %d pages\n", n_pages );
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/* Make the memory image we accumulate pixels in. We always accumulate
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* to RGBA, then trim down to whatever the output image needs on
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* _generate.
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*/
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gif->frame = vips_image_new_memory();
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vips_image_init_fields( gif->frame,
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gif->file->SWidth, gif->file->SHeight, 4, VIPS_FORMAT_UCHAR,
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VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB, 1.0, 1.0 );
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vips_image_pipelinev( gif->frame, VIPS_DEMAND_STYLE_ANY, NULL );
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if( vips_image_write_prepare( gif->frame ) )
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return( -1 );
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/* The real output image is long, and made on demand in _generate.
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*/
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vips_image_init_fields( load->out,
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gif->file->SWidth, gif->file->SHeight * n_pages,
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(gif->has_colour ? 3 : 1) + (gif->has_transparency ? 1 : 0),
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
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gif->has_colour ?
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VIPS_INTERPRETATION_sRGB : VIPS_INTERPRETATION_B_W,
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1.0, 1.0 );
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vips_image_pipelinev( load->out, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
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if( n_pages > 1 ) {
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vips_image_set_int( load->out,
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VIPS_META_PAGE_HEIGHT, gif->file->SHeight );
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vips_image_set_int( load->out, VIPS_META_N_PAGES, n_pages );
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}
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vips_image_set_int( load->out, "gif-delay", gif->delay );
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vips_image_set_int( load->out, "gif-loop", gif->loop );
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if( gif->comment )
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vips_image_set_string( load->out, "gif-comment", gif->comment );
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return( 0 );
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}
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static void
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vips_foreign_load_gif_render_line( VipsForeignLoadGif *gif,
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int width, VipsPel * restrict q, VipsPel * restrict p )
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@ -501,20 +798,6 @@ vips_foreign_load_gif_render( VipsForeignLoadGif *gif,
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return( 0 );
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}
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static int
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vips_foreign_load_gif_next( VipsForeignLoadGif *gif, GifByteType **extension )
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{
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if( DGifGetExtensionNext( gif->file, extension ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( *extension )
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VIPS_DEBUG_MSG( "gifload: EXTENSION_NEXT\n" );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_extension( VipsForeignLoadGif *gif )
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{
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@ -547,7 +830,7 @@ vips_foreign_load_gif_extension( VipsForeignLoadGif *gif )
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}
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while( extension != NULL )
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if( vips_foreign_load_gif_next( gif, &extension ) )
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if( vips_foreign_load_gif_ext_next( gif, &extension ) )
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return( -1 );
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return( 0 );
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@ -808,236 +1091,6 @@ vips_foreign_load_gif_pages( VipsForeignLoadGif *gif, VipsImage **out )
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return( 0 );
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}
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/* Quickly scan an image record.
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*/
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static int
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vips_foreign_load_gif_scan_image_record( VipsForeignLoadGif *gif )
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{
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GifFileType *file = gif->file;
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ColorMapObject *map = file->Image.ColorMap ?
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file->Image.ColorMap : file->SColorMap;
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GifByteType *dummy;
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/* Test for a non-greyscale colourmap for this frame.
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*/
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if( !gif->has_colour &&
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map ) {
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int i;
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for( i = 0; i < map->ColorCount; i++ )
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if( map->Colors[i].Red != map->Colors[i].Green ||
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map->Colors[i].Green != map->Colors[i].Blue ) {
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printf( "gifload: not mono\n" );
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gif->has_colour = TRUE;
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break;
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}
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}
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/* Step over compressed image data.
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*/
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do {
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if( DGifGetCodeNext( gif->file, &dummy ) == GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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} while( dummy != NULL );
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return( 0 );
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}
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static int
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vips_foreign_load_gif_scan_application_ext( VipsForeignLoadGif *gif,
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GifByteType *extension )
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{
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gboolean have_netscape;
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printf( "gifload: type: application\n" );
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/* The 11-byte NETSCAPE extension.
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*/
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have_netscape = FALSE;
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if( extension[0] == 11 &&
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vips_isprefix( "NETSCAPE2.0", (const char*) (extension + 1) ) )
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have_netscape = TRUE;
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while( extension != NULL ) {
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if( vips_foreign_load_gif_next( gif, &extension ) )
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return( -1 );
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if( have_netscape &&
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extension &&
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extension[0] == 3 &&
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extension[1] == 1 ) {
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gif->loop = extension[2] | (extension[3] << 8);
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printf( "gifload: seen loop %d\n",
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gif->loop );
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}
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}
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return( 0 );
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}
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static int
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vips_foreign_load_gif_scan_comment_ext( VipsForeignLoadGif *gif,
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GifByteType *extension )
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{
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VIPS_DEBUG_MSG( "gifload: type: comment\n" );
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if( !gif->comment ) {
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/* Up to 257 with a NULL terminator.
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*/
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char comment[257];
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vips_strncpy( comment, (char *) (extension + 1), 256 );
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comment[extension[0]] = '\0';
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gif->comment = g_strdup( comment );
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}
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while( extension != NULL )
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if( vips_foreign_load_gif_next( gif, &extension ) )
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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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vips_foreign_load_gif_scan_extension( VipsForeignLoadGif *gif )
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{
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GifByteType *extension;
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int ext_code;
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printf( "gifload: EXTENSION_RECORD_TYPE\n" );
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if( DGifGetExtension( gif->file, &ext_code, &extension ) ==
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GIF_ERROR ) {
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vips_foreign_load_gif_error( gif );
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return( -1 );
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}
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if( extension )
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switch( ext_code ) {
|
||||
case GRAPHICS_EXT_FUNC_CODE:
|
||||
if( extension[0] == 4 &&
|
||||
extension[1] & 0x1 )
|
||||
gif->has_transparency = TRUE;
|
||||
|
||||
if( !gif->has_delay ) {
|
||||
gif->has_delay = TRUE;
|
||||
gif->delay = extension[2] | (extension[3] << 8);
|
||||
}
|
||||
|
||||
while( extension != NULL )
|
||||
if( vips_foreign_load_gif_next(
|
||||
gif, &extension ) )
|
||||
return( -1 );
|
||||
|
||||
break;
|
||||
|
||||
case APPLICATION_EXT_FUNC_CODE:
|
||||
if( vips_foreign_load_gif_scan_application_ext( gif,
|
||||
extension ) )
|
||||
return( -1 );
|
||||
break;
|
||||
|
||||
case COMMENT_EXT_FUNC_CODE:
|
||||
if( vips_foreign_load_gif_scan_comment_ext( gif,
|
||||
extension ) )
|
||||
return( -1 );
|
||||
break;
|
||||
|
||||
default:
|
||||
/* Step over any NEXT blocks for unknown extensions.
|
||||
*/
|
||||
while( extension != NULL )
|
||||
if( vips_foreign_load_gif_next( gif,
|
||||
&extension ) )
|
||||
return( -1 );
|
||||
break;
|
||||
}
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/* Attempt to quickly scan a GIF and discover:
|
||||
* - number of frames (pages)
|
||||
* - mono or colour (check colourmap on each page)
|
||||
* - has transparency (check bit in ext block on every page)
|
||||
*/
|
||||
static int
|
||||
vips_foreign_load_gif_header( VipsForeignLoad *load )
|
||||
{
|
||||
VipsForeignLoadGifClass *class =
|
||||
(VipsForeignLoadGifClass *) VIPS_OBJECT_GET_CLASS( load );
|
||||
VipsForeignLoadGif *gif = (VipsForeignLoadGif *) load;
|
||||
|
||||
GifRecordType record;
|
||||
int n_pages;
|
||||
|
||||
printf( "vips_foreign_load_gif_header:\n" );
|
||||
|
||||
if( class->open( gif ) )
|
||||
return( -1 );
|
||||
|
||||
printf( "vips_foreign_load_gif_header: starting page scan\n" );
|
||||
|
||||
n_pages = 0;
|
||||
|
||||
do {
|
||||
if( DGifGetRecordType( gif->file, &record ) == GIF_ERROR ) {
|
||||
vips_foreign_load_gif_error( gif );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
switch( record ) {
|
||||
case IMAGE_DESC_RECORD_TYPE:
|
||||
printf( "gifload: IMAGE_DESC_RECORD_TYPE\n" );
|
||||
|
||||
if( DGifGetImageDesc( gif->file ) == GIF_ERROR ) {
|
||||
vips_foreign_load_gif_error( gif );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
/* Read in the image record.
|
||||
*/
|
||||
if( vips_foreign_load_gif_scan_image_record( gif ) )
|
||||
return( -1 );
|
||||
|
||||
n_pages += 1;
|
||||
|
||||
break;
|
||||
|
||||
case EXTENSION_RECORD_TYPE:
|
||||
/* We will need to fetch the extensions to check for
|
||||
* cmaps and transparency.
|
||||
*/
|
||||
if( vips_foreign_load_gif_scan_extension( gif ) )
|
||||
return( -1 );
|
||||
break;
|
||||
|
||||
case TERMINATE_RECORD_TYPE:
|
||||
printf( "gifload: TERMINATE_RECORD_TYPE\n" );
|
||||
gif->eof = TRUE;
|
||||
break;
|
||||
|
||||
case SCREEN_DESC_RECORD_TYPE:
|
||||
printf( "gifload: SCREEN_DESC_RECORD_TYPE\n" );
|
||||
break;
|
||||
|
||||
case UNDEFINED_RECORD_TYPE:
|
||||
printf( "gifload: UNDEFINED_RECORD_TYPE\n" );
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
} while( !gif->eof );
|
||||
|
||||
printf( "vips_foreign_load_gif_header: found %d pages\n", n_pages );
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
static int
|
||||
vips_foreign_load_gif_load( VipsForeignLoad *load )
|
||||
{
|
||||
|
|
@ -1049,9 +1102,6 @@ vips_foreign_load_gif_load( VipsForeignLoad *load )
|
|||
|
||||
VipsImage *im;
|
||||
|
||||
if( vips_foreign_load_gif_header( load ) )
|
||||
return( -1 );
|
||||
|
||||
if( class->open( gif ) )
|
||||
return( -1 );
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue