From 841fa7062ed736ada919ca7fa7efe256be47b618 Mon Sep 17 00:00:00 2001 From: Edward Hervey Date: Fri, 1 May 2020 15:03:55 +0200 Subject: [PATCH] gstvalue: No longer store same-type intersection functions in table The intersection function table is a legacy of 2005, when one could register random intersection functions. This is no longer the case. The only place where that table was used was: * `gst_value_can_intersect()`, where it was already only used for identical GType * `gst_value_intersect()`, where the table iteration was insanely expensive Instead this patch: * Only stored intersection functions for *different* types (of which there are only 4) * Make gst_value_intersect directly call the same-type intersection functions and only use the table if ever it doesn't match. Part-of: --- gst/gstvalue.c | 62 ++++++++++++++++++++++++++++++++++------------------------ 1 file changed, 36 insertions(+), 26 deletions(-) diff --git a/gst/gstvalue.c b/gst/gstvalue.c index 75fabac..5a4c652 100644 --- a/gst/gstvalue.c +++ b/gst/gstvalue.c @@ -6061,7 +6061,8 @@ gst_value_can_intersect (const GValue * value1, const GValue * value2) return TRUE; } - /* check registered intersect functions */ + /* check registered intersect functions (only different gtype are checked at + * this point) */ len = gst_value_intersect_funcs->len; for (i = 0; i < len; i++) { intersect_info = &g_array_index (gst_value_intersect_funcs, @@ -6116,15 +6117,36 @@ gst_value_intersect (GValue * dest, const GValue * value1, return TRUE; } - len = gst_value_intersect_funcs->len; - for (i = 0; i < len; i++) { - intersect_info = &g_array_index (gst_value_intersect_funcs, - GstValueIntersectInfo, i); - if (intersect_info->type1 == type1 && intersect_info->type2 == type2) { - return intersect_info->func (dest, value1, value2); - } - if (intersect_info->type1 == type2 && intersect_info->type2 == type1) { - return intersect_info->func (dest, value2, value1); + if (type1 == type2) { + /* Equal type comparison */ + if (type1 == GST_TYPE_INT_RANGE) + return gst_value_intersect_int_range_int_range (dest, value1, value2); + if (type1 == GST_TYPE_INT64_RANGE) + return gst_value_intersect_int64_range_int64_range (dest, value1, value2); + if (type1 == GST_TYPE_DOUBLE_RANGE) + return gst_value_intersect_double_range_double_range (dest, value1, + value2); + if (type1 == GST_TYPE_ARRAY) + return gst_value_intersect_array (dest, value1, value2); + if (type1 == GST_TYPE_FRACTION_RANGE) + return gst_value_intersect_fraction_range_fraction_range (dest, value1, + value2); + if (type1 == GST_TYPE_FLAG_SET) + return gst_value_intersect_flagset_flagset (dest, value1, value2); + if (type1 == GST_TYPE_STRUCTURE) + return gst_value_intersect_structure_structure (dest, value1, value2); + } else { + /* Different type comparison */ + len = gst_value_intersect_funcs->len; + for (i = 0; i < len; i++) { + intersect_info = &g_array_index (gst_value_intersect_funcs, + GstValueIntersectInfo, i); + if (intersect_info->type1 == type1 && intersect_info->type2 == type2) { + return intersect_info->func (dest, value1, value2); + } + if (intersect_info->type1 == type2 && intersect_info->type2 == type1) { + return intersect_info->func (dest, value2, value1); + } } } @@ -7785,7 +7807,7 @@ G_STMT_START { \ static const gint GST_VALUE_TABLE_DEFAULT_SIZE = 40; static const gint GST_VALUE_UNION_TABLE_DEFAULT_SIZE = 8; -static const gint GST_VALUE_INTERSECT_TABLE_DEFAULT_SIZE = 16; +static const gint GST_VALUE_INTERSECT_TABLE_DEFAULT_SIZE = 4; static const gint GST_VALUE_SUBTRACT_TABLE_DEFAULT_SIZE = 16; void @@ -7904,29 +7926,17 @@ _priv_gst_value_initialize (void) g_value_register_transform_func (G_TYPE_STRING, GST_TYPE_FLAG_SET, gst_value_transform_string_flagset); + /* Only register intersection functions for *different* types. + * Identical type intersection should be specified directly in + * gst_value_intersect() */ gst_value_register_intersect_func (G_TYPE_INT, GST_TYPE_INT_RANGE, gst_value_intersect_int_int_range); - gst_value_register_intersect_func (GST_TYPE_INT_RANGE, GST_TYPE_INT_RANGE, - gst_value_intersect_int_range_int_range); gst_value_register_intersect_func (G_TYPE_INT64, GST_TYPE_INT64_RANGE, gst_value_intersect_int64_int64_range); - gst_value_register_intersect_func (GST_TYPE_INT64_RANGE, - GST_TYPE_INT64_RANGE, gst_value_intersect_int64_range_int64_range); gst_value_register_intersect_func (G_TYPE_DOUBLE, GST_TYPE_DOUBLE_RANGE, gst_value_intersect_double_double_range); - gst_value_register_intersect_func (GST_TYPE_DOUBLE_RANGE, - GST_TYPE_DOUBLE_RANGE, gst_value_intersect_double_range_double_range); - gst_value_register_intersect_func (GST_TYPE_ARRAY, GST_TYPE_ARRAY, - gst_value_intersect_array); gst_value_register_intersect_func (GST_TYPE_FRACTION, GST_TYPE_FRACTION_RANGE, gst_value_intersect_fraction_fraction_range); - gst_value_register_intersect_func (GST_TYPE_FRACTION_RANGE, - GST_TYPE_FRACTION_RANGE, - gst_value_intersect_fraction_range_fraction_range); - gst_value_register_intersect_func (GST_TYPE_FLAG_SET, GST_TYPE_FLAG_SET, - gst_value_intersect_flagset_flagset); - gst_value_register_intersect_func (GST_TYPE_STRUCTURE, GST_TYPE_STRUCTURE, - gst_value_intersect_structure_structure); gst_value_register_subtract_func (G_TYPE_INT, GST_TYPE_INT_RANGE, gst_value_subtract_int_int_range); -- 2.7.4