[librsvg] Remove unexported/unused rsvg_cairo_to_pixbuf()

[Federico Mena Quintero <federico src gnome org>]

commit 2bf8da430bfdf4aa394edd9f2af7636e7f2a3bb3
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Mar 9 15:46:10 2018 -0600

    Remove unexported/unused rsvg_cairo_to_pixbuf()

 librsvg/rsvg-cairo-draw.c | 31 -------------------------------
 1 file changed, 31 deletions(-)
---
diff --git a/librsvg/rsvg-cairo-draw.c b/librsvg/rsvg-cairo-draw.c
index 9555e9a7..4b107fae 100644
--- a/librsvg/rsvg-cairo-draw.c
+++ b/librsvg/rsvg-cairo-draw.c
@@ -1058,34 +1058,3 @@ rsvg_cairo_surface_to_pixbuf (cairo_surface_t *surface)
 
     return dest;
 }
-
-/* This is unused but still exists for ABI compat. See bug #666868. */
-void rsvg_cairo_to_pixbuf (guint8 * pixels, int rowstride, int height);
-
-void
-rsvg_cairo_to_pixbuf (guint8 * pixels, int rowstride, int height)
-{
-    int row;
-    /* un-premultiply data */
-    for (row = 0; row < height; row++) {
-        guint8 *row_data = (pixels + (row * rowstride));
-        int i;
-
-        for (i = 0; i < rowstride; i += 4) {
-            guint8 *b = &row_data[i];
-            guint32 pixel;
-            guint8 alpha;
-
-            memcpy (&pixel, b, sizeof (guint32));
-            alpha = (pixel & 0xff000000) >> 24;
-            if (alpha == 0) {
-                b[0] = b[1] = b[2] = b[3] = 0;
-            } else {
-                b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
-                b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
-                b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
-                b[3] = alpha;
-            }
-        }
-    }
-}