[cogl] bitmap: calc rowstride from width * bpp if 0

[Robert Bragg <rbragg src gnome org>]

commit 1c809210092a8c5e223edfcab1e378b205cf35d6
Author: Robert Bragg <robert linux intel com>
Date:   Sun Jun 9 01:06:20 2013 +0100

    bitmap: calc rowstride from width * bpp if 0
    
    This updates cogl_bitmap_new_for_data() to calculate the rowstride from
    the width and bpp if the given rowstride is 0, to be consistent with how
    the texture apis work.
    
    Reviewed-by: Neil Roberts <neil linux intel com>

 cogl/cogl-bitmap.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/cogl/cogl-bitmap.c b/cogl/cogl-bitmap.c
index e8779a9..274d4ad 100644
--- a/cogl/cogl-bitmap.c
+++ b/cogl/cogl-bitmap.c
@@ -178,6 +178,10 @@ cogl_bitmap_new_for_data (CoglContext *context,
 
   g_return_val_if_fail (cogl_is_context (context), NULL);
 
+  /* Rowstride from width if not given */
+  if (rowstride == 0)
+    rowstride = width * _cogl_pixel_format_get_bytes_per_pixel (format);
+
   bmp = g_slice_new (CoglBitmap);
   bmp->context = context;
   bmp->format = format;