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gst/gststructure.c: No need to memset, we can clear the value ourselves.

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Original commit message from CVS:
* gst/gststructure.c: (gst_structure_id_empty_new_with_size):
No need to memset, we can clear the value ourselves.
* gst/gstvalue.c: (gst_type_is_fixed),
(gst_value_get_compare_func):
Some optimisations from a few callgrind sessions:
When checking if a type is fixed, check for trivial fundamental types
first before checking types for which we need to get the type followed
by the heavy duty type checks, this reduces the amount of
g_type_fundamental() calls a lot.
When getting the compare function, first check for our registered types.
If that fails, do the heavy duty g_type_is_a() checks, reduces the
amount of g_type_is_a() considerably.
This commit is contained in:
Wim Taymans 2008-11-05 16:57:35 +00:00
parent 773c1e4c1d
commit 209c57085c
3 changed files with 42 additions and 13 deletions
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16
ChangeLog
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@ -1,3 +1,19 @@
2008-11-05 Wim Taymans <wim.taymans@collabora.co.uk>
* gst/gststructure.c: (gst_structure_id_empty_new_with_size):
No need to memset, we can clear the value ourselves.
* gst/gstvalue.c: (gst_type_is_fixed),
(gst_value_get_compare_func):
Some optimisations from a few callgrind sessions:
When checking if a type is fixed, check for trivial fundamental types
first before checking types for which we need to get the type followed
by the heavy duty type checks, this reduces the amount of
g_type_fundamental() calls a lot.
When getting the compare function, first check for our registered types.
If that fails, do the heavy duty g_type_is_a() checks, reduces the
amount of g_type_is_a() considerably.
2008-11-05 Wim Taymans <wim.taymans@collabora.co.uk>
* docs/design/part-TODO.txt:

3
gst/gststructure.c
View file

@ -113,9 +113,10 @@ gst_structure_id_empty_new_with_size (GQuark quark, guint prealloc)
{
GstStructure *structure;
structure = g_slice_new0 (GstStructure);
structure = g_slice_new (GstStructure);
structure->type = gst_structure_get_type ();
structure->name = quark;
structure->parent_refcount = NULL;
structure->fields =
g_array_sized_new (FALSE, TRUE, sizeof (GstStructureField), prealloc);

36
gst/gstvalue.c
View file

@ -148,20 +148,25 @@ gst_value_transform_any_list_string (const GValue * src_value,
* there. Do not export, since it doesn't work for types where the content
* decides the fixedness (e.g. GST_TYPE_ARRAY).
*/
static gboolean
gst_type_is_fixed (GType type)
{
if (type == GST_TYPE_INT_RANGE || type == GST_TYPE_DOUBLE_RANGE ||
type == GST_TYPE_LIST) {
return FALSE;
}
if (G_TYPE_FUNDAMENTAL (type) <=
G_TYPE_MAKE_FUNDAMENTAL (G_TYPE_RESERVED_GLIB_LAST)) {
/* the basic int, string, double types */
if (type <= G_TYPE_MAKE_FUNDAMENTAL (G_TYPE_RESERVED_GLIB_LAST)) {
return TRUE;
}
if (type == GST_TYPE_BUFFER || type == GST_TYPE_FOURCC
|| type == GST_TYPE_ARRAY || type == GST_TYPE_FRACTION) {
/* 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) {
return FALSE;
}
/* other (boxed) types that are fixed */
if (type == GST_TYPE_BUFFER) {
return TRUE;
}
/* heavy checks */
if (G_TYPE_IS_FUNDAMENTAL (type) || G_TYPE_FUNDAMENTAL (type) <=
G_TYPE_MAKE_FUNDAMENTAL (G_TYPE_RESERVED_GLIB_LAST)) {
return TRUE;
}
@ -2795,15 +2800,22 @@ gst_value_get_compare_func (const GValue * value1)
GstValueTable *table, *best = NULL;
guint i;
/* this is a fast check */
for (i = 0; i < gst_value_table->len; i++) {
table = &g_array_index (gst_value_table, GstValueTable, i);
if (table->type == G_VALUE_TYPE (value1) && table->compare != NULL) {
best = table;
break;
}
if (g_type_is_a (G_VALUE_TYPE (value1), table->type)) {
if (!best || g_type_is_a (table->type, best->type))
best = table;
}
/* slower checks */
if (!best) {
for (i = 0; i < gst_value_table->len; i++) {
table = &g_array_index (gst_value_table, GstValueTable, i);
if (g_type_is_a (G_VALUE_TYPE (value1), table->type)) {
if (!best || g_type_is_a (table->type, best->type))
best = table;
}
}
}
if (best) {