--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicscomposition/openwfcompositionengine/common/src/owfutils.c	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,118 @@
+/* Copyright (c) 2009 The Khronos Group Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and/or associated documentation files (the
+ * "Materials"), to deal in the Materials without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Materials, and to
+ * permit persons to whom the Materials are furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Materials.
+ *
+ * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+ */
+
+ #include "owftypes.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+OWFint min(OWFint aLhs, OWFint aRhs)
+{
+    if (aLhs < aRhs) {
+        return aLhs;
+    }
+    return aRhs;
+}
+
+void OWF_Rect_Set(OWF_RECTANGLE* rect,
+                  OWFint left,
+                  OWFint top,
+                  OWFint width,
+                  OWFint height)
+{
+    if (!rect) {
+        return;
+    }
+
+    rect->x = left;
+    rect->y = top;
+    rect->width = width;
+    rect->height = height;
+}
+
+OWFboolean OWF_Rect_Clip(OWF_RECTANGLE* clipped,
+                         OWF_RECTANGLE* rect,
+                         OWF_RECTANGLE* bounds)
+{
+    OWFint dw, dh, dx0, dy0, dx1, dy1; /* destination image coordinates */
+    OWFint bl, bt, br, bb;
+
+    bl = bounds->x;
+    bt = bounds->y;
+    br = bl + bounds->width;
+    bb = bt + bounds->height;
+
+    dw = rect->width;
+    dh = rect->height;
+    dx0 = rect->x;
+    dy0 = rect->y;
+
+    /* Crop x coords to target image width */
+    if (dx0 < bl) {
+        dw = dw - (bl - dx0);
+        dx0 = bl;
+    }
+
+    /* check if destination rectangle is outside target image */
+    if (dx0 >= br) {
+        return OWF_FALSE;
+    }
+
+    /* Crop y coord to target image height */
+    if (dy0 < bt) {
+        dh = dh - (bt - dy0);
+        dy0 = bt;
+    }
+
+    /* check if destination rectangle is outside target image */
+    if (dy0 >= bb) {
+        return OWF_FALSE;
+    }
+
+    /* clamp right edge */
+    dx1 = dx0 + dw;
+    if (dx1 >= br) {
+        dx1 = br;
+    } else if (dx1 < bl) {
+        return OWF_FALSE;
+    }
+
+    /* clamp bottom edge */
+    dy1 = dy0 + dh;
+    if (dy1 >= bb) {
+        dy1 = bb;
+    } else if (dy1 < bt) {
+        return OWF_FALSE;
+    }
+
+    clipped->x = dx0;
+    clipped->y = dy0;
+    clipped->width = dx1 - dx0;
+    clipped->height = dy1 - dy0;
+
+    return OWF_TRUE;
+}
+
+#ifdef __cplusplus
+}
+#endif