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gstvalue: quicker test for substraction emptiness

Browse source 
When we do not care about the actual resulting set,
but only whether it is empty of not, we can skip a fair bit
of GValue juggling.

Add a function that does so, since we cannot just pass NULL
to the existing API as it may be part of the API contract.

https://bugzilla.gnome.org/show_bug.cgi?id=662777
This commit is contained in:
Vincent Penquerc'h 2011-10-27 10:35:53 +01:00
parent 7090257a83
commit 29c97fe780
2 changed files with 49 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
gst/gststructure.c
View file

@ -3108,7 +3108,6 @@ gst_caps_structure_is_subset_field (GQuark field_id, const GValue * value,
gpointer user_data)
{
GstStructure *superset = user_data;
GValue subtraction = { 0, };
const GValue *other;
if (!(other = gst_structure_id_get_value (superset, field_id)))
@ -3139,13 +3138,10 @@ gst_caps_structure_is_subset_field (GQuark field_id, const GValue * value,
* subtractions needs to give en empty set.
* Both substractions are switched below, as it's faster that way.
*/
if (!gst_value_subtract (&subtraction, value, other)) {
if (gst_value_subtract (&subtraction, other, value)) {
g_value_unset (&subtraction);
if (!gst_value_subtract (NULL, value, other)) {
if (gst_value_subtract (NULL, other, value)) {
return TRUE;
}
} else {
g_value_unset (&subtraction);
}
return FALSE;
}

61
gst/gstvalue.c
View file

@ -2860,7 +2860,8 @@ gst_value_subtract_int_int_range (GValue * dest, const GValue * minuend,
* range */
if (val < min || val > max) {
/* and the result is the int */
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
return FALSE;
@ -2889,6 +2890,9 @@ gst_value_create_new_range (GValue * dest, gint min1, gint max1, gint min2,
return FALSE;
}
if (!dest)
return TRUE;
if (min1 < max1) {
g_value_init (pv1, GST_TYPE_INT_RANGE);
gst_value_set_int_range (pv1, min1, max1);
@ -2924,7 +2928,8 @@ gst_value_subtract_int_range_int (GValue * dest, const GValue * minuend,
/* value is outside of the range, return range unchanged */
if (val < min || val > max) {
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
} else {
/* max must be MAXINT too as val <= max */
@ -2937,7 +2942,8 @@ gst_value_subtract_int_range_int (GValue * dest, const GValue * minuend,
min++;
val++;
}
gst_value_create_new_range (dest, min, val - 1, val + 1, max);
if (dest)
gst_value_create_new_range (dest, min, val - 1, val + 1, max);
}
return TRUE;
}
@ -2975,7 +2981,8 @@ gst_value_subtract_int64_int64_range (GValue * dest, const GValue * minuend,
* range */
if (val < min || val > max) {
/* and the result is the int64 */
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
return FALSE;
@ -3004,6 +3011,9 @@ gst_value_create_new_int64_range (GValue * dest, gint64 min1, gint64 max1,
return FALSE;
}
if (!dest)
return TRUE;
if (min1 < max1) {
g_value_init (pv1, GST_TYPE_INT64_RANGE);
gst_value_set_int64_range (pv1, min1, max1);
@ -3039,7 +3049,8 @@ gst_value_subtract_int64_range_int64 (GValue * dest, const GValue * minuend,
/* value is outside of the range, return range unchanged */
if (val < min || val > max) {
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
} else {
/* max must be MAXINT64 too as val <= max */
@ -3052,7 +3063,8 @@ gst_value_subtract_int64_range_int64 (GValue * dest, const GValue * minuend,
min++;
val++;
}
gst_value_create_new_int64_range (dest, min, val - 1, val + 1, max);
if (dest)
gst_value_create_new_int64_range (dest, min, val - 1, val + 1, max);
}
return TRUE;
}
@ -3089,7 +3101,8 @@ gst_value_subtract_double_double_range (GValue * dest, const GValue * minuend,
gdouble val = g_value_get_double (minuend);
if (val < min || val > max) {
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
return FALSE;
@ -3101,7 +3114,8 @@ gst_value_subtract_double_range_double (GValue * dest, const GValue * minuend,
{
/* since we don't have open ranges, we cannot create a hole in
* a double range. We return the original range */
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
@ -3132,6 +3146,9 @@ gst_value_subtract_double_range_double_range (GValue * dest,
return FALSE;
}
if (!dest)
return TRUE;
if (min1 < max1) {
g_value_init (pv1, GST_TYPE_DOUBLE_RANGE);
gst_value_set_double_range (pv1, min1, max1);
@ -3164,6 +3181,15 @@ gst_value_subtract_from_list (GValue * dest, const GValue * minuend,
for (i = 0; i < size; i++) {
const GValue *cur = VALUE_LIST_GET_VALUE (minuend, i);
/* quicker version when we can discard the result */
if (!dest) {
if (gst_value_subtract (NULL, cur, subtrahend)) {
ret = TRUE;
break;
}
continue;
}
if (gst_value_subtract (&subtraction, cur, subtrahend)) {
if (!ret) {
gst_value_init_and_copy (dest, &subtraction);
@ -3209,7 +3235,8 @@ gst_value_subtract_list (GValue * dest, const GValue * minuend,
return FALSE;
}
}
gst_value_init_and_copy (dest, result);
if (dest)
gst_value_init_and_copy (dest, result);
g_value_unset (result);
return TRUE;
}
@ -3230,7 +3257,8 @@ gst_value_subtract_fraction_fraction_range (GValue * dest,
gst_value_compare_with_func (minuend, max, compare) ==
GST_VALUE_GREATER_THAN) {
/* and the result is the value */
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
}
@ -3243,7 +3271,8 @@ gst_value_subtract_fraction_range_fraction (GValue * dest,
{
/* since we don't have open ranges, we cannot create a hole in
* a range. We return the original range */
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
}
@ -3294,6 +3323,9 @@ gst_value_subtract_fraction_range_fraction_range (GValue * dest,
return FALSE;
}
if (!dest)
return TRUE;
if (cmp1 == GST_VALUE_LESS_THAN) {
g_value_init (pv1, GST_TYPE_FRACTION_RANGE);
gst_value_set_fraction_range (pv1, min1, max1);
@ -3703,7 +3735,8 @@ gst_value_register_intersect_func (GType type1, GType type2,
/**
* gst_value_subtract:
* @dest: (out caller-allocates): the destination value for the result if the
* subtraction is not empty
* subtraction is not empty. May be NULL, in which case the resulting set
* will not be computed, which can give a fair speedup.
* @minuend: the value to subtract from
* @subtrahend: the value to subtract
*
@ -3720,7 +3753,6 @@ gst_value_subtract (GValue * dest, const GValue * minuend,
guint i, len;
GType ltype, mtype, stype;
g_return_val_if_fail (dest != NULL, FALSE);
g_return_val_if_fail (G_IS_VALUE (minuend), FALSE);
g_return_val_if_fail (G_IS_VALUE (subtrahend), FALSE);
@ -3744,7 +3776,8 @@ gst_value_subtract (GValue * dest, const GValue * minuend,
}
if (gst_value_compare (minuend, subtrahend) != GST_VALUE_EQUAL) {
gst_value_init_and_copy (dest, minuend);
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;
}