[gegl] operations/external/save-pixbuf: Don't waste memory

[Øyvind Kolås <ok src gnome org>]

commit 9153be299f1c6cc6ee545ef1dad428fe1ced018e
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Feb 23 15:35:23 2017 +0100

    operations/external/save-pixbuf: Don't waste memory
    
    A GdkPixbuf takes 8 bits per channel, but only 3 or 4 bytes per pixel.
    The later value should be used to allocate the buffer.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779136

 operations/external/save-pixbuf.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/operations/external/save-pixbuf.c b/operations/external/save-pixbuf.c
index 4ff44cd..7fdcfdf 100644
--- a/operations/external/save-pixbuf.c
+++ b/operations/external/save-pixbuf.c
@@ -54,6 +54,7 @@ process (GeglOperation       *operation,
       GeglRectangle *rect = gegl_operation_source_get_bounding_box (operation, "input");
       gchar *name;
       gboolean has_alpha;
+      gint bpp;
       gint bps;
 
       g_object_get (input, "format", &format, NULL);
@@ -67,7 +68,8 @@ process (GeglOperation       *operation,
                   bps);
       babl = babl_format (name);
 
-      temp = g_malloc (rect->width * rect->height * bps);
+      bpp = babl_format_get_bytes_per_pixel (babl);
+      temp = g_malloc (rect->width * rect->height * bpp);
       gegl_buffer_get (input, rect, 1.0, babl, temp, GEGL_AUTO_ROWSTRIDE,
                        GEGL_ABYSS_NONE);
       if (temp) {