worker: move dcc_add_surface_area_image

Author:    Marc-André Lureau <marcandre.lureau@gmail.com>
Acked-by: Jonathon Jongsma <jjongsma@redhat.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/server/utils.c b/server/utils.c
new file mode 100644
index 00000000..66df86ff
--- /dev/null
+++ b/server/utils.c
@@ -0,0 +1,50 @@
+/*
+   Copyright (C) 2009-2015 Red Hat, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <glib.h>
+#include "utils.h"
+
+int rgb32_data_has_alpha(int width, int height, size_t stride,
+                         uint8_t *data, int *all_set_out)
+{
+    uint32_t *line, *end, alpha;
+    int has_alpha;
+
+    has_alpha = FALSE;
+    while (height-- > 0) {
+        line = (uint32_t *)data;
+        end = line + width;
+        data += stride;
+        while (line != end) {
+            alpha = *line & 0xff000000U;
+            if (alpha != 0) {
+                has_alpha = TRUE;
+                if (alpha != 0xff000000U) {
+                    *all_set_out = FALSE;
+                    return TRUE;
+                }
+            }
+            line++;
+        }
+    }
+
+    *all_set_out = has_alpha;
+    return has_alpha;
+}