[librsvg] (#451): Make rsvg-convert detect images larger than pixman's limit

[Federico Mena Quintero <federico src gnome org>]

commit 90779ad40f9a7d1d6ba294e663973ff9c895d4e0
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Aug 16 12:49:05 2019 -0500

    (#451): Make rsvg-convert detect images larger than pixman's limit
    
    Fixes https://gitlab.gnome.org/GNOME/librsvg/issues/451

 rsvg-convert.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/rsvg-convert.c b/rsvg-convert.c
index 2df9546a..16e4d64b 100644
--- a/rsvg-convert.c
+++ b/rsvg-convert.c
@@ -458,6 +458,13 @@ main (int argc, char **argv)
             scaled_height = dimensions.height;
             get_final_size (&scaled_width, &scaled_height, &size_data);
 
+            if (scaled_width > 32767 || scaled_height > 32767) {
+                g_printerr (_("The resulting image would be larger than 32767 pixels on either dimension.\n"
+                              "Librsvg currently cannot render to images bigger than that.\n"
+                              "Please specify a smaller size.\n"));
+                exit (1);
+            }
+
             if (!format || !strcmp (format, "png"))
                 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
                                                       scaled_width, scaled_height);