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* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file smallmatrix_type.hpp Simple matrix class that allows allocating an item without the need to copy this->data needlessly. */
#ifndef SMALLMATRIX_TYPE_HPP
#define SMALLMATRIX_TYPE_HPP
#include "alloc_func.hpp"
#include "mem_func.hpp"
/**
* Simple matrix template class.
*
* Allocating a matrix in one piece reduces overhead in allocations compared
* with allocating a vector of vectors and saves some pointer dereferencing.
* However, you can only get rectangular matrixes like this and if you're
* changing their height very often performance will probably be worse than
* with a vector of vectors, due to more frequent copying of memory blocks.
*
* No iterators are provided as iterating the columns would require persistent
* column objects. Those do not exist. Providing iterators with transient
* column objects would tie each iterator to a column object, thus replacing
* previously retrieved columns when iterating and defeating the point of
* iteration.
*
* It's expected that the items don't need to be constructed or deleted by the
* container. Only memory allocation and deallocation is performed. This is the
* same for all openttd "SmallContainer" classes.
*
* @tparam T The type of the items stored
*/
template <typename T>
class SmallMatrix {
protected:
T *data; ///< The pointer to the first item
uint width; ///< Number of items over first axis
uint height; ///< Number of items over second axis
uint capacity; ///< The available space for storing items
public:
SmallMatrix() : data(nullptr), width(0), height(0), capacity(0) {}
/**
* Copy constructor.
* @param other The other matrix to copy.
*/
SmallMatrix(const SmallMatrix &other) : data(nullptr), width(0), height(0), capacity(0)
{
this->Assign(other);
}
~SmallMatrix()
{
free(this->data);
}
/**
* Assignment.
* @param other The other matrix to assign.
*/
SmallMatrix &operator=(const SmallMatrix &other)
{
this->Assign(other);
return *this;
}
/**
* Assign items from other vector.
*/
inline void Assign(const SmallMatrix &other)
{
if (&other == this) return;
this->height = other.Height();
this->width = other.Width();
uint num_items = this->width * this->height;
if (num_items > this->capacity) {
this->capacity = num_items;
free(this->data);
this->data = MallocT<T>(num_items);
MemCpyT(this->data, other[0], num_items);
} else if (num_items > 0) {
MemCpyT(this->data, other[0], num_items);
}
}
/**
* Remove all rows from the matrix.
*/
inline void Clear()
{
/* In fact we just reset the width avoiding the need to
* probably reallocate the same amount of memory the matrix was
* previously using. */
this->width = 0;
}
/**
* Remove all items from the list and free allocated memory.
*/
inline void Reset()
{
this->height = 0;
this->width = 0;
this->capacity = 0;
free(this->data);
this->data = nullptr;
}
/**
* Compact the matrix down to the smallest possible size.
*/
inline void Compact()
{
uint capacity = this->height * this->width;
if (capacity >= this->capacity) return;
this->capacity = capacity;
this->data = ReallocT(this->data, this->capacity);
}
/**
* Erase a column, replacing it with the last one.
* @param x Position of the column.
*/
void EraseColumn(uint x)
{
if (x < --this->width) {
MemCpyT<T>(this->data + x * this->height,
this->data + this->width * this->height,
this->height);
}
}
/**
* Remove columns from the matrix while preserving the order of other columns.
* @param x First column to remove.
* @param count Number of consecutive columns to remove.
*/
void EraseColumnPreservingOrder(uint x, uint count = 1)
{
if (count == 0) return;
assert(x < this->width);
assert(x + count <= this->width);
this->width -= count;
uint to_move = (this->width - x) * this->height;
if (to_move > 0) {
MemMoveT(this->data + x * this->height,
this->data + (x + count) * this->height, to_move);
}
}
/**
* Erase a row, replacing it with the last one.
* @param y Position of the row.
*/
void EraseRow(uint y)
{
if (y < this->height - 1) {
for (uint x = 0; x < this->width; ++x) {
this->data[x * this->height + y] =
this->data[(x + 1) * this->height - 1];
}
}
this->Resize(this->width, this->height - 1);
}
/**
* Remove columns from the matrix while preserving the order of other columns.
* @param y First column to remove.
* @param count Number of consecutive columns to remove.
*/
void EraseRowPreservingOrder(uint y, uint count = 1)
{
if (this->height > count + y) {
for (uint x = 0; x < this->width; ++x) {
MemMoveT(this->data + x * this->height + y,
this->data + x * this->height + y + count,
this->height - count - y);
}
}
this->Resize(this->width, this->height - count);
}
/**
* Append rows.
* @param to_add Number of rows to append.
*/
inline void AppendRow(uint to_add = 1)
{
this->Resize(this->width, to_add + this->height);
}
/**
* Append rows.
* @param to_add Number of rows to append.
*/
inline void AppendColumn(uint to_add = 1)
{
this->Resize(to_add + this->width, this->height);
}
/**
* Set the size to a specific width and height, preserving item positions
* as far as possible in the process.
* @param new_width Target width.
* @param new_height Target height.
*/
inline void Resize(uint new_width, uint new_height)
{
uint new_capacity = new_width * new_height;
T *new_data = nullptr;
void (*copy)(T *dest, const T *src, size_t count) = nullptr;
if (new_capacity > this->capacity) {
/* If the data doesn't fit into current capacity, resize and copy ... */
new_data = MallocT<T>(new_capacity);
copy = &MemCpyT<T>;
} else {
/* ... otherwise just move the columns around, if necessary. */
new_data = this->data;
copy = &MemMoveT<T>;
}
if (this->height != new_height || new_data != this->data) {
if (this->height > 0) {
if (new_height > this->height) {
/* If matrix is growing, copy from the back to avoid
* overwriting uncopied data. */
for (uint x = this->width; x > 0; --x) {
if (x * new_height > new_capacity) continue;
(*copy)(new_data + (x - 1) * new_height,
this->data + (x - 1) * this->height,
std::min(this->height, new_height));
}
} else {
/* If matrix is shrinking copy from the front. */
for (uint x = 0; x < this->width; ++x) {
if ((x + 1) * new_height > new_capacity) break;
(*copy)(new_data + x * new_height,
this->data + x * this->height,
std::min(this->height, new_height));
}
}
}
this->height = new_height;
if (new_data != this->data) {
free(this->data);
this->data = new_data;
this->capacity = new_capacity;
}
}
this->width = new_width;
}
inline uint Height() const
{
return this->height;
}
inline uint Width() const
{
return this->width;
}
/**
* Get item x/y (const).
*
* @param x X-position of the item.
* @param y Y-position of the item.
* @return Item at specified position.
*/
inline const T &Get(uint x, uint y) const
{
assert(x < this->width && y < this->height);
return this->data[x * this->height + y];
}
/**
* Get item x/y.
*
* @param x X-position of the item.
* @param y Y-position of the item.
* @return Item at specified position.
*/
inline T &Get(uint x, uint y)
{
assert(x < this->width && y < this->height);
return this->data[x * this->height + y];
}
/**
* Get column "number" (const)
*
* @param x Position of the column.
* @return Column at "number".
*/
inline const T *operator[](uint x) const
{
assert(x < this->width);
return this->data + x * this->height;
}
/**
* Get column "number" (const)
*
* @param x Position of the column.
* @return Column at "number".
*/
inline T *operator[](uint x)
{
assert(x < this->width);
return this->data + x * this->height;
}
};
#endif /* SMALLMATRIX_TYPE_HPP */
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