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(svn r13276) -Codechange: use qsort() for initial sorting of a list for better performance (credits go to skidd13 and peter1138)

This commit is contained in:
smatz 2008-05-26 21:27:06 +00:00
parent a509746288
commit a0b14f02c8
1 changed files with 38 additions and 17 deletions
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55
src/sortlist_type.h
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@ -9,11 +9,12 @@
#include "date_type.h"
enum SortListFlags {
VL_NONE = 0, ///< no sort
VL_DESC = 1 << 0, ///< sort descending or ascending
VL_RESORT = 1 << 1, ///< instruct the code to resort the list in the next loop
VL_REBUILD = 1 << 2, ///< create sort-listing to use for qsort and friends
VL_END = 1 << 3,
VL_NONE = 0, ///< no sort
VL_DESC = 1 << 0, ///< sort descending or ascending
VL_RESORT = 1 << 1, ///< instruct the code to resort the list in the next loop
VL_REBUILD = 1 << 2, ///< rebuild the sort list
VL_FIRST_SORT = 1 << 3, ///< sort with qsort first
VL_END = 1 << 4,
};
DECLARE_ENUM_AS_BIT_SET(SortListFlags);
@ -52,10 +53,25 @@ public: // Temporary: public for conversion only
this->resort_timer = DAY_TICKS * 10;
}
/**
* Reverse the list
*/
void Reverse()
{
assert(this->IsSortable());
T *a = this->data;
T *b = a + (this->items - 1);
do {
Swap(*a, *b);
} while (((a + 1) != b) && (++a != --b));
}
public:
GUIList() :
func_list(NULL),
flags(VL_NONE),
flags(VL_FIRST_SORT),
sort_type(0),
resort_timer(1)
{};
@ -78,7 +94,7 @@ public:
void SetSortType(uint8 n_type)
{
if (this->sort_type != n_type) {
SETBITS(this->flags, VL_RESORT);
SETBITS(this->flags, VL_RESORT | VL_FIRST_SORT);
this->sort_type = n_type;
}
}
@ -110,6 +126,8 @@ public:
CLRBITS(this->flags, VL_DESC);
}
this->sort_type = l.criteria;
SETBITS(this->flags, VL_FIRST_SORT);
}
/**
@ -158,21 +176,16 @@ public:
{
this->flags ^= VL_DESC;
if (this->IsSortable()) {
T *a = this->data;
T *b = a + (this->items - 1);
do {
Swap(*a, *b);
} while (((a + 1) != b) && (++a != --b));
}
if (this->IsSortable()) this->Reverse();
}
/**
* GnomeSort algorithm
* This sorting uses a slightly modifyied Gnome search.
* The basic Gnome search trys to sort already sorted
* list parts. The modification skips these.
* list parts. The modification skips these. For the first
* sorting we use qsort since it is faster for irregular
* sorted data.
*
* @param compare The function to compare two list items
* */
@ -188,12 +201,20 @@ public:
/* Do not sort when the list is not sortable */
if (!this->IsSortable()) return;
const bool desc = HASBITS(this->flags, VL_DESC);
if (HASBITS(this->flags, VL_FIRST_SORT)) {
qsort(this->data, this->items, sizeof(T), (int (*)(const void *a, const void *b))compare);
if (desc) this->Reverse();
return;
}
T *a = this->data;
T *b = a + 1;
uint length = this->items;
uint offset = 0; // Jump variable
const bool desc = HASBITS(this->flags, VL_DESC);
while (length > 1) {
const int diff = compare(a, b);