gst/gstcaps.c: Callgrind micro optimisations.

Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_copy), (_gst_caps_free),
(gst_caps_merge_structure), (gst_caps_get_structure),
(gst_caps_copy_nth), (gst_caps_set_simple),
(gst_caps_set_simple_valist), (gst_caps_is_fixed),
(gst_caps_is_equal_fixed), (gst_caps_intersect),
(gst_caps_subtract), (gst_caps_normalize), (gst_caps_do_simplify),
(gst_caps_to_string):
Callgrind micro optimisations.
Avoid array bounds checks and force inline of trivial function.
* gst/gstobject.c: (gst_object_set_name_default):
-1 is equivalent to letting glib to the strlen but then there is more
room for optimisations and it's not our fault.
* gst/gststructure.c: (gst_structure_id_empty_new_with_size):
no need to clear the array, we're cool.
* gst/gstvalue.c: (gst_type_is_fixed), (gst_value_is_fixed):
The most common _is_fixed() check is done on fundamental glib base
types so we check this first instead of doing a huge amount of
useless GST_TYPE_ARRAY calls.

ChangeLog

@@ -1,3 +1,27 @@
+2008-11-06  Wim Taymans  <wim.taymans@collabora.co.uk>
+
+	* gst/gstcaps.c: (gst_caps_copy), (_gst_caps_free),
+	(gst_caps_merge_structure), (gst_caps_get_structure),
+	(gst_caps_copy_nth), (gst_caps_set_simple),
+	(gst_caps_set_simple_valist), (gst_caps_is_fixed),
+	(gst_caps_is_equal_fixed), (gst_caps_intersect),
+	(gst_caps_subtract), (gst_caps_normalize), (gst_caps_do_simplify),
+	(gst_caps_to_string):
+	Callgrind micro optimisations.
+	Avoid array bounds checks and force inline of trivial function.
+
+	* gst/gstobject.c: (gst_object_set_name_default):
+	-1 is equivalent to letting glib to the strlen but then there is more
+	room for optimisations and it's not our fault.
+
+	* gst/gststructure.c: (gst_structure_id_empty_new_with_size):
+	no need to clear the array, we're cool.
+
+	* gst/gstvalue.c: (gst_type_is_fixed), (gst_value_is_fixed):
+	The most common _is_fixed() check is done on fundamental glib base
+	types so we check this first instead of doing a huge amount of
+	useless GST_TYPE_ARRAY calls.
+
 2008-11-06  Wim Taymans  <wim.taymans@collabora.co.uk>
 
 	* gst/gstevent.h:

gst/gstcaps.c

@@ -91,6 +91,12 @@
 #define IS_WRITABLE(caps) \
   (g_atomic_int_get (&(caps)->refcount) == 1)
 
+/* quick way to get a caps structure at an index without doing a type or array
+ * length check */
+#define gst_caps_get_structure_unchecked(caps, index) \
+     ((GstStructure *)g_ptr_array_index ((caps)->structs, (index)))
+
+
 /* lock to protect multiple invocations of static caps to caps conversion */
 G_LOCK_DEFINE_STATIC (static_caps_lock);
 
@@ -272,7 +278,7 @@ gst_caps_copy (const GstCaps * caps)
   newcaps->flags = caps->flags;
 
   for (i = 0; i < caps->structs->len; i++) {
-    structure = gst_caps_get_structure (caps, i);
+    structure = gst_caps_get_structure_unchecked (caps, i);
     gst_caps_append_structure (newcaps, gst_structure_copy (structure));
   }
 
@@ -289,7 +295,7 @@ _gst_caps_free (GstCaps * caps)
    * don't bother testing. */
 
   for (i = 0; i < caps->structs->len; i++) {
-    structure = (GstStructure *) gst_caps_get_structure (caps, i);
+    structure = (GstStructure *) gst_caps_get_structure_unchecked (caps, i);
     gst_structure_set_parent_refcount (structure, NULL);
     gst_structure_free (structure);
   }
@@ -743,7 +749,7 @@ gst_caps_merge_structure (GstCaps * caps, GstStructure * structure)
 #endif
     /* check each structure */
     for (i = caps->structs->len - 1; i >= 0; i--) {
-      structure1 = gst_caps_get_structure (caps, i);
+      structure1 = gst_caps_get_structure_unchecked (caps, i);
       /* if structure is a subset of structure1, then skip it */
       if (gst_caps_structure_is_subset (structure1, structure)) {
         unique = FALSE;
@@ -797,7 +803,7 @@ gst_caps_get_structure (const GstCaps * caps, guint index)
   g_return_val_if_fail (GST_IS_CAPS (caps), NULL);
   g_return_val_if_fail (index < caps->structs->len, NULL);
 
-  return g_ptr_array_index (caps->structs, index);
+  return gst_caps_get_structure_unchecked (caps, index);
 }
 
 /**
@@ -822,7 +828,7 @@ gst_caps_copy_nth (const GstCaps * caps, guint nth)
   newcaps->flags = caps->flags;
 
   if (caps->structs->len > nth) {
-    structure = gst_caps_get_structure (caps, nth);
+    structure = gst_caps_get_structure_unchecked (caps, nth);
     gst_caps_append_structure (newcaps, gst_structure_copy (structure));
   }
 
@@ -870,7 +876,7 @@ gst_caps_set_simple (GstCaps * caps, const char *field, ...)
   g_return_if_fail (caps->structs->len == 1);
   g_return_if_fail (IS_WRITABLE (caps));
 
-  structure = gst_caps_get_structure (caps, 0);
+  structure = gst_caps_get_structure_unchecked (caps, 0);
 
   va_start (var_args, field);
   gst_structure_set_valist (structure, field, var_args);
@@ -896,7 +902,7 @@ gst_caps_set_simple_valist (GstCaps * caps, const char *field, va_list varargs)
   g_return_if_fail (caps->structs->len == 1);
   g_return_if_fail (IS_WRITABLE (caps));
 
-  structure = gst_caps_get_structure (caps, 0);
+  structure = gst_caps_get_structure_unchecked (caps, 0);
 
   gst_structure_set_valist (structure, field, varargs);
 }
@@ -965,7 +971,7 @@ gst_caps_is_fixed (const GstCaps * caps)
   if (caps->structs->len != 1)
     return FALSE;
 
-  structure = gst_caps_get_structure (caps, 0);
+  structure = gst_caps_get_structure_unchecked (caps, 0);
 
   return gst_structure_foreach (structure, gst_caps_is_fixed_foreach, NULL);
 }
@@ -988,8 +994,8 @@ gst_caps_is_equal_fixed (const GstCaps * caps1, const GstCaps * caps2)
   g_return_val_if_fail (gst_caps_is_fixed (caps1), FALSE);
   g_return_val_if_fail (gst_caps_is_fixed (caps2), FALSE);
 
-  struct1 = gst_caps_get_structure (caps1, 0);
+  struct1 = gst_caps_get_structure_unchecked (caps1, 0);
-  struct2 = gst_caps_get_structure (caps2, 0);
+  struct2 = gst_caps_get_structure_unchecked (caps2, 0);
 
   if (struct1->name != struct2->name) {
     return FALSE;
@@ -1257,8 +1263,8 @@ gst_caps_intersect (const GstCaps * caps1, const GstCaps * caps2)
     /* now run the diagonal line, end condition is the left or bottom
      * border */
     while (k < caps2->structs->len) {
-      struct1 = gst_caps_get_structure (caps1, j);
+      struct1 = gst_caps_get_structure_unchecked (caps1, j);
-      struct2 = gst_caps_get_structure (caps2, k);
+      struct2 = gst_caps_get_structure_unchecked (caps2, k);
 
       istruct = gst_caps_structure_intersect (struct1, struct2);
 
@@ -1371,14 +1377,14 @@ gst_caps_subtract (const GstCaps * minuend, const GstCaps * subtrahend)
 
   src = gst_caps_copy (minuend);
   for (i = 0; i < subtrahend->structs->len; i++) {
-    sub = gst_caps_get_structure (subtrahend, i);
+    sub = gst_caps_get_structure_unchecked (subtrahend, i);
     if (dest) {
       gst_caps_unref (src);
       src = dest;
     }
     dest = gst_caps_new_empty ();
     for (j = 0; j < src->structs->len; j++) {
-      min = gst_caps_get_structure (src, j);
+      min = gst_caps_get_structure_unchecked (src, j);
       if (gst_structure_get_name_id (min) == gst_structure_get_name_id (sub)) {
         GSList *list;
 
@@ -1499,7 +1505,7 @@ gst_caps_normalize (const GstCaps * caps)
   nf.caps = newcaps;
 
   for (i = 0; i < newcaps->structs->len; i++) {
-    nf.structure = gst_caps_get_structure (newcaps, i);
+    nf.structure = gst_caps_get_structure_unchecked (newcaps, i);
 
     while (!gst_structure_foreach (nf.structure,
             gst_caps_normalize_foreach, &nf));
@@ -1660,14 +1666,15 @@ gst_caps_do_simplify (GstCaps * caps)
 
   start = caps->structs->len - 1;
   for (i = caps->structs->len - 1; i >= 0; i--) {
-    simplify = gst_caps_get_structure (caps, i);
+    simplify = gst_caps_get_structure_unchecked (caps, i);
     if (gst_structure_get_name_id (simplify) !=
-        gst_structure_get_name_id (gst_caps_get_structure (caps, start)))
+        gst_structure_get_name_id (gst_caps_get_structure_unchecked (caps,
+                start)))
       start = i;
     for (j = start; j >= 0; j--) {
       if (j == i)
         continue;
-      compare = gst_caps_get_structure (caps, j);
+      compare = gst_caps_get_structure_unchecked (caps, j);
       if (gst_structure_get_name_id (simplify) !=
           gst_structure_get_name_id (compare)) {
         break;
@@ -1806,7 +1813,9 @@ gst_caps_to_string (const GstCaps * caps)
   /* estimate a rough string length to avoid unnecessary reallocs in GString */
   slen = 0;
   for (i = 0; i < caps->structs->len; i++) {
-    slen += STRUCTURE_ESTIMATED_STRING_LEN (gst_caps_get_structure (caps, i));
+    slen +=
+        STRUCTURE_ESTIMATED_STRING_LEN (gst_caps_get_structure_unchecked (caps,
+            i));
   }
 
   s = g_string_sized_new (slen);
@@ -1818,7 +1827,7 @@ gst_caps_to_string (const GstCaps * caps)
       g_string_append_c (s, ' ');
     }
 
-    structure = gst_caps_get_structure (caps, i);
+    structure = gst_caps_get_structure_unchecked (caps, i);
     priv_gst_structure_append_to_gstring (structure, s);
   }
   if (s->len && s->str[s->len - 1] == ';') {

gst/gstobject.c

@@ -621,7 +621,7 @@ gst_object_set_name_default (GstObject * object)
   if (strncmp (type_name, "Gst", 3) == 0)
     type_name += 3;
   tmp = g_strdup_printf ("%s%d", type_name, count);
-  name = g_ascii_strdown (tmp, strlen (tmp));
+  name = g_ascii_strdown (tmp, -1);
   g_free (tmp);
 
   result = gst_object_set_name (object, name);

gst/gststructure.c

@@ -118,7 +118,7 @@ gst_structure_id_empty_new_with_size (GQuark quark, guint prealloc)
   structure->name = quark;
   structure->parent_refcount = NULL;
   structure->fields =
-      g_array_sized_new (FALSE, TRUE, sizeof (GstStructureField), prealloc);
+      g_array_sized_new (FALSE, FALSE, sizeof (GstStructureField), prealloc);
 
   return structure;
 }

gst/gstvalue.c

@@ -157,7 +157,8 @@ gst_type_is_fixed (GType type)
   }
   /* our fundamental types that are certainly not fixed */
   if (type == GST_TYPE_INT_RANGE || type == GST_TYPE_DOUBLE_RANGE ||
-      type == GST_TYPE_LIST || type == GST_TYPE_FRACTION_RANGE) {
+      type == GST_TYPE_LIST || type == GST_TYPE_FRACTION_RANGE ||
+      type == GST_TYPE_ARRAY) {
     return FALSE;
   }
   /* other (boxed) types that are fixed */
@@ -3341,6 +3342,9 @@ gst_value_is_fixed (const GValue * value)
 {
   GType type = G_VALUE_TYPE (value);
 
+  if (gst_type_is_fixed (type))
+    return TRUE;
+
   if (type == GST_TYPE_ARRAY) {
     gint size, n;
     const GValue *kid;
@@ -3355,7 +3359,7 @@ gst_value_is_fixed (const GValue * value)
     return TRUE;
   }
 
-  return gst_type_is_fixed (type);
+  return FALSE;
 }
 
 /************