From ee6fc5c15bdbe975625ee2211986770b98aca9c6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 26 Feb 2010 00:41:00 -0700
Subject: [PATCH] MOBI Output: If the SVG rasterizer is not avaialbale continue
 anyway

---
 src/calibre/ebooks/mobi/output.py              | 9 ++++++---
 src/calibre/ebooks/oeb/transforms/rasterize.py | 5 ++++-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/calibre/ebooks/mobi/output.py b/src/calibre/ebooks/mobi/output.py
index e3a1da34cc..451fe11e4f 100644
--- a/src/calibre/ebooks/mobi/output.py
+++ b/src/calibre/ebooks/mobi/output.py
@@ -154,7 +154,7 @@ class MOBIOutput(OutputFormatPlugin):
                 MobiWriter, PALMDOC, UNCOMPRESSED
         from calibre.ebooks.mobi.mobiml import MobiMLizer
         from calibre.ebooks.oeb.transforms.manglecase import CaseMangler
-        from calibre.ebooks.oeb.transforms.rasterize import SVGRasterizer
+        from calibre.ebooks.oeb.transforms.rasterize import SVGRasterizer, Unavailable
         from calibre.ebooks.oeb.transforms.htmltoc import HTMLTOCAdder
         from calibre.customize.ui import plugin_for_input_format
         imagemax = PALM_MAX_IMAGE_SIZE if opts.rescale_images else None
@@ -163,8 +163,11 @@ class MOBIOutput(OutputFormatPlugin):
             tocadder(oeb, opts)
         mangler = CaseMangler()
         mangler(oeb, opts)
-        rasterizer = SVGRasterizer()
-        rasterizer(oeb, opts)
+        try:
+            rasterizer = SVGRasterizer()
+            rasterizer(oeb, opts)
+        except Unavailable:
+            self.log.warn('SVG rasterizer unavailable, SVG will not be converted')
         mobimlizer = MobiMLizer(ignore_tables=opts.linearize_tables)
         mobimlizer(oeb, opts)
         self.check_for_periodical()
diff --git a/src/calibre/ebooks/oeb/transforms/rasterize.py b/src/calibre/ebooks/oeb/transforms/rasterize.py
index ac28e51b15..1026b625bf 100644
--- a/src/calibre/ebooks/oeb/transforms/rasterize.py
+++ b/src/calibre/ebooks/oeb/transforms/rasterize.py
@@ -27,11 +27,14 @@ from calibre.ebooks.oeb.stylizer import Stylizer
 IMAGE_TAGS = set([XHTML('img'), XHTML('object')])
 KEEP_ATTRS = set(['class', 'style', 'width', 'height', 'align'])
 
+class Unavailable(Exception):
+    pass
+
 class SVGRasterizer(object):
     def __init__(self):
         from calibre.gui2 import is_ok_to_use_qt
         if not is_ok_to_use_qt():
-            raise Exception('Not OK to use Qt')
+            raise Unavailable('Not OK to use Qt')
 
     @classmethod
     def config(cls, cfg):