[evince/wip/chpe/load-fd-backend-ps] ps: Implement loading from file descriptor

[Christian Persch <chpe src gnome org>]

commit 8f4b18b4902a04f5eb3ce98bde0aba5e16cab225
Author: Christian Persch <chpe src gnome org>
Date:   Tue Jan 11 21:08:03 2022 +0100

    ps: Implement loading from file descriptor
    
    The required libspectre patch is not upstream yet, so disable
    this for now.

 backend/ps/ev-spectre.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
---
diff --git a/backend/ps/ev-spectre.c b/backend/ps/ev-spectre.c
index e602d5b13..593592056 100644
--- a/backend/ps/ev-spectre.c
+++ b/backend/ps/ev-spectre.c
@@ -29,6 +29,10 @@
 #include "ev-file-exporter.h"
 #include "ev-document-misc.h"
 
+#if SPECTRE_VERSION >= 10000000
+#define HAVE_LOAD_FD
+#endif
+
 struct _PSDocument {
        EvDocument object;
 
@@ -108,6 +112,31 @@ ps_document_load (EvDocument *document,
        return TRUE;
 }
 
+#ifdef HAVE_LOAD_FD
+static gboolean
+ps_document_load_fd (EvDocument         *document,
+                    int                 fd,
+                     EvDocumentLoadFlags flags,
+                     GCancellable       *cancellable,
+                    GError            **error)
+{
+       PSDocument *ps = PS_DOCUMENT (document);
+
+       ps->doc = spectre_document_new ();
+
+       spectre_document_load_from_fd (ps->doc, fd);
+       if (spectre_document_status (ps->doc)) {
+               g_set_error_literal (error,
+                                    G_FILE_ERROR,
+                                    G_FILE_ERROR_FAILED,
+                                    _("Failed to load document"));
+               return FALSE;
+       }
+
+       return TRUE;
+}
+#endif
+
 static gboolean
 ps_document_save (EvDocument *document,
                  const char *uri,
@@ -357,6 +386,9 @@ ps_document_class_init (PSDocumentClass *klass)
        ev_document_class->get_info = ps_document_get_info;
        ev_document_class->get_backend_info = ps_document_get_backend_info;
        ev_document_class->render = ps_document_render;
+#ifdef HAVE_LOAD_FD
+       ev_document_class->load_fd = ps_document_load_fd;
+#endif
 }
 
 /* EvFileExporterIface */