pdfload reopens after minimise if necessary
We were using "minimise" to close pdf input early, but this will break programs which make several output images from one sequential input image. For example, loading all pages of a PDF as a toilet-roll image, then saving pages as a set of PNGs. This patch adds vfuncs for open and close, and makes _generate reopen the input if necessary. We will need similar patches for pdfiumload, gifload, gifnsload, tiffload etc. see https://github.com/libvips/libvips/issues/1370#issuecomment-533169856
This commit is contained in:
John Cupitt
parent
2472f52123
commit
0323b77666
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@ -10,8 +10,10 @@
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* - use a much larger strip size, thanks bubba
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* 8/6/18
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* - add background param
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* 16/8/18
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* - shut down the input file as soon as we can [kleisauke]
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* 16/8/18 [kleisauke]
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* - shut down the input file as soon as we can
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* 19/9/19
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* - reopen the input if we minimised too early
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*/
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/*
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@ -66,6 +68,21 @@
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#include <cairo.h>
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#include <poppler.h>
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#define VIPS_TYPE_FOREIGN_LOAD_PDF (vips_foreign_load_pdf_get_type())
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#define VIPS_FOREIGN_LOAD_PDF( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdf ))
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#define VIPS_FOREIGN_LOAD_PDF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdfClass))
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#define VIPS_IS_FOREIGN_LOAD_PDF( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_FOREIGN_LOAD_PDF ))
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#define VIPS_IS_FOREIGN_LOAD_PDF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_FOREIGN_LOAD_PDF ))
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#define VIPS_FOREIGN_LOAD_PDF_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdfClass ))
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typedef struct _VipsForeignLoadPdf {
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VipsForeignLoad parent_object;
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@ -113,24 +130,24 @@ typedef struct _VipsForeignLoadPdf {
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} VipsForeignLoadPdf;
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typedef VipsForeignLoadClass VipsForeignLoadPdfClass;
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typedef struct _VipsForeignLoadPdfClass {
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VipsForeignLoadClass parent_class;
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int (*open)( VipsForeignLoadPdf *pdf );
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void (*close)( VipsForeignLoadPdf *pdf );
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} VipsForeignLoadPdfClass;
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G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadPdf, vips_foreign_load_pdf,
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VIPS_TYPE_FOREIGN_LOAD );
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static void
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vips_foreign_load_pdf_close( VipsForeignLoadPdf *pdf )
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{
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VIPS_UNREF( pdf->page );
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VIPS_UNREF( pdf->doc );
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}
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static void
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vips_foreign_load_pdf_dispose( GObject *gobject )
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{
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VipsForeignLoadPdf *pdf = (VipsForeignLoadPdf *) gobject;
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( gobject );
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VipsForeignLoadPdfClass *class = VIPS_FOREIGN_LOAD_PDF_GET_CLASS( pdf );
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vips_foreign_load_pdf_close( pdf );
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class->close( pdf );
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G_OBJECT_CLASS( vips_foreign_load_pdf_parent_class )->
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dispose( gobject );
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@ -139,7 +156,7 @@ vips_foreign_load_pdf_dispose( GObject *gobject )
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static int
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vips_foreign_load_pdf_build( VipsObject *object )
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{
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VipsForeignLoadPdf *pdf = (VipsForeignLoadPdf *) object;
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( object );
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if( !vips_object_argument_isset( object, "scale" ) )
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pdf->scale = pdf->dpi / 72.0;
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@ -255,7 +272,9 @@ static int
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vips_foreign_load_pdf_header( VipsForeignLoad *load )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( load );
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VipsForeignLoadPdf *pdf = (VipsForeignLoadPdf *) load;
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( load );
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VipsForeignLoadPdfClass *pdf_class =
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VIPS_FOREIGN_LOAD_PDF_GET_CLASS( pdf );
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int top;
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int i;
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@ -264,6 +283,9 @@ vips_foreign_load_pdf_header( VipsForeignLoad *load )
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printf( "vips_foreign_load_pdf_header: %p\n", pdf );
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#endif /*DEBUG*/
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if( pdf_class->open( pdf ) )
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return( -1 );
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pdf->n_pages = poppler_document_get_n_pages( pdf->doc );
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/* @n == -1 means until the end of the doc.
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@ -342,15 +364,20 @@ vips_foreign_load_pdf_minimise( VipsObject *object, VipsForeignLoadPdf *pdf )
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{
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/* In seq mode, we can shut down the input at the end of computation.
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*/
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if( VIPS_FOREIGN_LOAD( pdf )->access == VIPS_ACCESS_SEQUENTIAL )
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vips_foreign_load_pdf_close( pdf );
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if( VIPS_FOREIGN_LOAD( pdf )->access == VIPS_ACCESS_SEQUENTIAL ) {
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VipsForeignLoadPdfClass *class =
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VIPS_FOREIGN_LOAD_PDF_GET_CLASS( pdf );
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class->close( pdf );
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}
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}
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static int
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vips_foreign_load_pdf_generate( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsForeignLoadPdf *pdf = (VipsForeignLoadPdf *) a;
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( a );
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VipsForeignLoadPdfClass *class = VIPS_FOREIGN_LOAD_PDF_GET_CLASS( pdf );
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VipsRect *r = &or->valid;
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int top;
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@ -363,6 +390,11 @@ vips_foreign_load_pdf_generate( VipsRegion *or,
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r->left, r->top, r->width, r->height );
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*/
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/* We may have been minimised. Make sure the doc is open.
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*/
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if( class->open( pdf ) )
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return( -1 );
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/* Poppler won't always paint the background.
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*/
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vips_region_paint_pel( or, r, pdf->ink );
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@ -422,7 +454,7 @@ vips_foreign_load_pdf_generate( VipsRegion *or,
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static int
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vips_foreign_load_pdf_load( VipsForeignLoad *load )
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{
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VipsForeignLoadPdf *pdf = (VipsForeignLoadPdf *) load;
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( load );
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VipsImage **t = (VipsImage **)
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vips_object_local_array( (VipsObject *) load, 2 );
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@ -459,6 +491,19 @@ vips_foreign_load_pdf_load( VipsForeignLoad *load )
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return( 0 );
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}
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static int
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vips_foreign_load_pdf_open( VipsForeignLoadPdf *pdf )
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{
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return( 0 );
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}
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static void
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vips_foreign_load_pdf_close( VipsForeignLoadPdf *pdf )
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{
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VIPS_UNREF( pdf->page );
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VIPS_UNREF( pdf->doc );
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}
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static void
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vips_foreign_load_pdf_class_init( VipsForeignLoadPdfClass *class )
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{
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@ -479,6 +524,9 @@ vips_foreign_load_pdf_class_init( VipsForeignLoadPdfClass *class )
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load_class->get_flags = vips_foreign_load_pdf_get_flags;
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load_class->load = vips_foreign_load_pdf_load;
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class->open = vips_foreign_load_pdf_open;
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class->close = vips_foreign_load_pdf_close;
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VIPS_ARG_INT( class, "page", 20,
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_( "Page" ),
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_( "Load this page from the file" ),
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@ -557,28 +605,8 @@ vips_foreign_load_pdf_file_dispose( GObject *gobject )
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static int
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vips_foreign_load_pdf_file_header( VipsForeignLoad *load )
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{
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VipsForeignLoadPdf *pdf = (VipsForeignLoadPdf *) load;
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VipsForeignLoadPdfFile *file = (VipsForeignLoadPdfFile *) load;
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char *path;
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GError *error = NULL;
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/* We need an absolute path for a URI.
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*/
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path = vips_realpath( file->filename );
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if( !(file->uri = g_filename_to_uri( path, NULL, &error )) ) {
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g_free( path );
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vips_g_error( &error );
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return( -1 );
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}
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g_free( path );
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if( !(pdf->doc = poppler_document_new_from_file(
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file->uri, NULL, &error )) ) {
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vips_g_error( &error );
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return( -1 );
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}
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VIPS_SETSTR( load->out->filename, file->filename );
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return( vips_foreign_load_pdf_header( load ) );
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@ -589,6 +617,38 @@ static const char *vips_foreign_pdf_suffs[] = {
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NULL
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};
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static int
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vips_foreign_load_pdf_file_open( VipsForeignLoadPdf *pdf )
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{
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VipsForeignLoadPdfFile *file = (VipsForeignLoadPdfFile *) pdf;
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GError *error = NULL;
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if( !file->uri ) {
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char *path;
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/* We need an absolute path for a URI.
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*/
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path = vips_realpath( file->filename );
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if( !(file->uri = g_filename_to_uri( path, NULL, &error )) ) {
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g_free( path );
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vips_g_error( &error );
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return( -1 );
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}
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g_free( path );
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}
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if( !pdf->doc &&
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!(pdf->doc = poppler_document_new_from_file(
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file->uri, NULL, &error )) ) {
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vips_g_error( &error );
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return( -1 );
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}
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return( VIPS_FOREIGN_LOAD_PDF_CLASS(
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vips_foreign_load_pdf_file_parent_class )->open( pdf ) );
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}
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static void
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vips_foreign_load_pdf_file_class_init(
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VipsForeignLoadPdfFileClass *class )
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@ -609,6 +669,8 @@ vips_foreign_load_pdf_file_class_init(
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load_class->is_a = vips_foreign_load_pdf_is_a;
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load_class->header = vips_foreign_load_pdf_file_header;
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class->open = vips_foreign_load_pdf_file_open;
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VIPS_ARG_STRING( class, "filename", 1,
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_( "Filename" ),
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_( "Filename to load from" ),
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@ -638,21 +700,21 @@ G_DEFINE_TYPE( VipsForeignLoadPdfBuffer, vips_foreign_load_pdf_buffer,
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vips_foreign_load_pdf_get_type() );
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static int
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vips_foreign_load_pdf_buffer_header( VipsForeignLoad *load )
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vips_foreign_load_pdf_buffer_open( VipsForeignLoadPdf *pdf )
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{
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VipsForeignLoadPdf *pdf = (VipsForeignLoadPdf *) load;
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VipsForeignLoadPdfBuffer *buffer =
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(VipsForeignLoadPdfBuffer *) load;
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VipsForeignLoadPdfBuffer *buffer = (VipsForeignLoadPdfBuffer *) pdf;
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GError *error = NULL;
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if( !(pdf->doc = poppler_document_new_from_data(
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if( !pdf->doc &&
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!(pdf->doc = poppler_document_new_from_data(
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buffer->buf->data, buffer->buf->length, NULL, &error )) ) {
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vips_g_error( &error );
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return( -1 );
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}
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return( vips_foreign_load_pdf_header( load ) );
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return( VIPS_FOREIGN_LOAD_PDF_CLASS(
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vips_foreign_load_pdf_buffer_parent_class )->open( pdf ) );
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}
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static void
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@ -669,7 +731,8 @@ vips_foreign_load_pdf_buffer_class_init(
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object_class->nickname = "pdfload_buffer";
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load_class->is_a_buffer = vips_foreign_load_pdf_is_a_buffer;
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load_class->header = vips_foreign_load_pdf_buffer_header;
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class->open = vips_foreign_load_pdf_buffer_open;
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VIPS_ARG_BOXED( class, "buffer", 1,
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_( "Buffer" ),
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