+/**
+ * Adjust pixel unpack params and image dimensions to strip off the
+ * texture border.
+ *
+ * Gallium and intel don't support texture borders. They've seldem been used
+ * and seldom been implemented correctly anyway.
+ *
+ * \param unpackNew returns the new pixel unpack parameters
+ */
+static void
+strip_texture_border(GLint *border,
+ GLint *width, GLint *height, GLint *depth,
+ const struct gl_pixelstore_attrib *unpack,
+ struct gl_pixelstore_attrib *unpackNew)
+{
+ assert(*border > 0); /* sanity check */
+
+ *unpackNew = *unpack;
+
+ if (unpackNew->RowLength == 0)
+ unpackNew->RowLength = *width;
+
+ if (depth && unpackNew->ImageHeight == 0)
+ unpackNew->ImageHeight = *height;
+
+ unpackNew->SkipPixels += *border;
+ if (height)
+ unpackNew->SkipRows += *border;
+ if (depth)
+ unpackNew->SkipImages += *border;
+
+ assert(*width >= 3);
+ *width = *width - 2 * *border;
+ if (height && *height >= 3)
+ *height = *height - 2 * *border;
+ if (depth && *depth >= 3)
+ *depth = *depth - 2 * *border;
+ *border = 0;
+}