mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-14 16:40:56 +00:00
412 lines
9.8 KiB
C++
412 lines
9.8 KiB
C++
/** @file SkylineBinPack.cpp
|
|
@author Jukka Jylänki
|
|
|
|
@brief Implements different bin packer algorithms that use the SKYLINE data structure.
|
|
|
|
This work is released to Public Domain, do whatever you want with it.
|
|
*/
|
|
|
|
#include <cassert>
|
|
#include <limits.h>
|
|
#include "templates.h"
|
|
|
|
#include "SkylineBinPack.h"
|
|
|
|
using namespace std;
|
|
|
|
SkylineBinPack::SkylineBinPack()
|
|
:binWidth(0),
|
|
binHeight(0)
|
|
{
|
|
}
|
|
|
|
SkylineBinPack::SkylineBinPack(int width, int height, bool useWasteMap)
|
|
{
|
|
Init(width, height, useWasteMap);
|
|
}
|
|
|
|
void SkylineBinPack::Init(int width, int height, bool useWasteMap_)
|
|
{
|
|
binWidth = width;
|
|
binHeight = height;
|
|
|
|
useWasteMap = useWasteMap_;
|
|
|
|
#ifdef _DEBUG
|
|
disjointRects.Clear();
|
|
#endif
|
|
|
|
usedSurfaceArea = 0;
|
|
skyLine.Clear();
|
|
SkylineNode node;
|
|
node.x = 0;
|
|
node.y = 0;
|
|
node.width = binWidth;
|
|
skyLine.Push(node);
|
|
|
|
if (useWasteMap)
|
|
{
|
|
wasteMap.Init(width, height);
|
|
wasteMap.GetFreeRectangles().Clear();
|
|
}
|
|
}
|
|
|
|
void SkylineBinPack::Insert(TArray<RectSize> &rects, TArray<Rect> &dst)
|
|
{
|
|
dst.Clear();
|
|
|
|
while(rects.Size() > 0)
|
|
{
|
|
Rect bestNode;
|
|
int bestScore1 = INT_MAX;
|
|
int bestScore2 = INT_MAX;
|
|
int bestSkylineIndex = -1;
|
|
int bestRectIndex = -1;
|
|
for(unsigned i = 0; i < rects.Size(); ++i)
|
|
{
|
|
Rect newNode;
|
|
int score1;
|
|
int score2;
|
|
int index;
|
|
newNode = FindPositionForNewNodeMinWaste(rects[i].width, rects[i].height, score2, score1, index);
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(newNode));
|
|
#endif
|
|
if (newNode.height != 0)
|
|
{
|
|
if (score1 < bestScore1 || (score1 == bestScore1 && score2 < bestScore2))
|
|
{
|
|
bestNode = newNode;
|
|
bestScore1 = score1;
|
|
bestScore2 = score2;
|
|
bestSkylineIndex = index;
|
|
bestRectIndex = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (bestRectIndex == -1)
|
|
return;
|
|
|
|
// Perform the actual packing.
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(bestNode));
|
|
disjointRects.Add(bestNode);
|
|
#endif
|
|
AddSkylineLevel(bestSkylineIndex, bestNode);
|
|
usedSurfaceArea += rects[bestRectIndex].width * rects[bestRectIndex].height;
|
|
rects.Delete(bestRectIndex);
|
|
dst.Push(bestNode);
|
|
}
|
|
}
|
|
|
|
Rect SkylineBinPack::Insert(int width, int height)
|
|
{
|
|
// First try to pack this rectangle into the waste map, if it fits.
|
|
Rect node = wasteMap.Insert(width, height, true, GuillotineBinPack::RectBestShortSideFit,
|
|
GuillotineBinPack::SplitMaximizeArea);
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(node));
|
|
#endif
|
|
|
|
if (node.height != 0)
|
|
{
|
|
Rect newNode;
|
|
newNode.x = node.x;
|
|
newNode.y = node.y;
|
|
newNode.width = node.width;
|
|
newNode.height = node.height;
|
|
usedSurfaceArea += width * height;
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(newNode));
|
|
disjointRects.Add(newNode);
|
|
#endif
|
|
return newNode;
|
|
}
|
|
|
|
return InsertBottomLeft(width, height);
|
|
}
|
|
|
|
bool SkylineBinPack::RectangleFits(int skylineNodeIndex, int width, int height, int &y) const
|
|
{
|
|
int x = skyLine[skylineNodeIndex].x;
|
|
if (x + width > binWidth)
|
|
return false;
|
|
int widthLeft = width;
|
|
int i = skylineNodeIndex;
|
|
y = skyLine[skylineNodeIndex].y;
|
|
while(widthLeft > 0)
|
|
{
|
|
y = MAX(y, skyLine[i].y);
|
|
if (y + height > binHeight)
|
|
return false;
|
|
widthLeft -= skyLine[i].width;
|
|
++i;
|
|
assert(i < (int)skyLine.Size() || widthLeft <= 0);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
int SkylineBinPack::ComputeWastedArea(int skylineNodeIndex, int width, int height, int y) const
|
|
{
|
|
int wastedArea = 0;
|
|
const int rectLeft = skyLine[skylineNodeIndex].x;
|
|
const int rectRight = rectLeft + width;
|
|
for(; skylineNodeIndex < (int)skyLine.Size() && skyLine[skylineNodeIndex].x < rectRight; ++skylineNodeIndex)
|
|
{
|
|
if (skyLine[skylineNodeIndex].x >= rectRight || skyLine[skylineNodeIndex].x + skyLine[skylineNodeIndex].width <= rectLeft)
|
|
break;
|
|
|
|
int leftSide = skyLine[skylineNodeIndex].x;
|
|
int rightSide = MIN(rectRight, leftSide + skyLine[skylineNodeIndex].width);
|
|
assert(y >= skyLine[skylineNodeIndex].y);
|
|
wastedArea += (rightSide - leftSide) * (y - skyLine[skylineNodeIndex].y);
|
|
}
|
|
return wastedArea;
|
|
}
|
|
|
|
bool SkylineBinPack::RectangleFits(int skylineNodeIndex, int width, int height, int &y, int &wastedArea) const
|
|
{
|
|
bool fits = RectangleFits(skylineNodeIndex, width, height, y);
|
|
if (fits)
|
|
wastedArea = ComputeWastedArea(skylineNodeIndex, width, height, y);
|
|
|
|
return fits;
|
|
}
|
|
|
|
void SkylineBinPack::AddWasteMapArea(int skylineNodeIndex, int width, int height, int y)
|
|
{
|
|
int wastedArea = 0;
|
|
const int rectLeft = skyLine[skylineNodeIndex].x;
|
|
const int rectRight = rectLeft + width;
|
|
for(; skylineNodeIndex < (int)skyLine.Size() && skyLine[skylineNodeIndex].x < rectRight; ++skylineNodeIndex)
|
|
{
|
|
if (skyLine[skylineNodeIndex].x >= rectRight || skyLine[skylineNodeIndex].x + skyLine[skylineNodeIndex].width <= rectLeft)
|
|
break;
|
|
|
|
int leftSide = skyLine[skylineNodeIndex].x;
|
|
int rightSide = MIN(rectRight, leftSide + skyLine[skylineNodeIndex].width);
|
|
assert(y >= skyLine[skylineNodeIndex].y);
|
|
|
|
Rect waste;
|
|
waste.x = leftSide;
|
|
waste.y = skyLine[skylineNodeIndex].y;
|
|
waste.width = rightSide - leftSide;
|
|
waste.height = y - skyLine[skylineNodeIndex].y;
|
|
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(waste));
|
|
#endif
|
|
wasteMap.GetFreeRectangles().Push(waste);
|
|
}
|
|
}
|
|
|
|
void SkylineBinPack::AddWaste(const Rect &waste)
|
|
{
|
|
wasteMap.GetFreeRectangles().Push(waste);
|
|
#ifdef _DEBUG
|
|
disjointRects.Del(waste);
|
|
wasteMap.DelDisjoint(waste);
|
|
#endif
|
|
}
|
|
|
|
void SkylineBinPack::AddSkylineLevel(int skylineNodeIndex, const Rect &rect)
|
|
{
|
|
// First track all wasted areas and mark them into the waste map if we're using one.
|
|
if (useWasteMap)
|
|
AddWasteMapArea(skylineNodeIndex, rect.width, rect.height, rect.y);
|
|
|
|
SkylineNode newNode;
|
|
newNode.x = rect.x;
|
|
newNode.y = rect.y + rect.height;
|
|
newNode.width = rect.width;
|
|
skyLine.Insert(skylineNodeIndex, newNode);
|
|
|
|
assert(newNode.x + newNode.width <= binWidth);
|
|
assert(newNode.y <= binHeight);
|
|
|
|
for(unsigned i = skylineNodeIndex+1; i < skyLine.Size(); ++i)
|
|
{
|
|
assert(skyLine[i-1].x <= skyLine[i].x);
|
|
|
|
if (skyLine[i].x < skyLine[i-1].x + skyLine[i-1].width)
|
|
{
|
|
int shrink = skyLine[i-1].x + skyLine[i-1].width - skyLine[i].x;
|
|
|
|
skyLine[i].x += shrink;
|
|
skyLine[i].width -= shrink;
|
|
|
|
if (skyLine[i].width <= 0)
|
|
{
|
|
skyLine.Delete(i);
|
|
--i;
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
MergeSkylines();
|
|
}
|
|
|
|
void SkylineBinPack::MergeSkylines()
|
|
{
|
|
for(unsigned i = 0; i < skyLine.Size()-1; ++i)
|
|
if (skyLine[i].y == skyLine[i+1].y)
|
|
{
|
|
skyLine[i].width += skyLine[i+1].width;
|
|
skyLine.Delete(i+1);
|
|
--i;
|
|
}
|
|
}
|
|
|
|
Rect SkylineBinPack::InsertBottomLeft(int width, int height)
|
|
{
|
|
int bestHeight;
|
|
int bestWidth;
|
|
int bestIndex;
|
|
Rect newNode = FindPositionForNewNodeBottomLeft(width, height, bestHeight, bestWidth, bestIndex);
|
|
|
|
if (bestIndex != -1)
|
|
{
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(newNode));
|
|
#endif
|
|
// Perform the actual packing.
|
|
AddSkylineLevel(bestIndex, newNode);
|
|
|
|
usedSurfaceArea += width * height;
|
|
#ifdef _DEBUG
|
|
disjointRects.Add(newNode);
|
|
#endif
|
|
}
|
|
else
|
|
memset(&newNode, 0, sizeof(Rect));
|
|
|
|
return newNode;
|
|
}
|
|
|
|
Rect SkylineBinPack::FindPositionForNewNodeBottomLeft(int width, int height, int &bestHeight, int &bestWidth, int &bestIndex) const
|
|
{
|
|
bestHeight = INT_MAX;
|
|
bestIndex = -1;
|
|
// Used to break ties if there are nodes at the same level. Then pick the narrowest one.
|
|
bestWidth = INT_MAX;
|
|
Rect newNode = { 0, 0, 0, 0 };
|
|
for(unsigned i = 0; i < skyLine.Size(); ++i)
|
|
{
|
|
int y;
|
|
if (RectangleFits(i, width, height, y))
|
|
{
|
|
if (y + height < bestHeight || (y + height == bestHeight && skyLine[i].width < bestWidth))
|
|
{
|
|
bestHeight = y + height;
|
|
bestIndex = i;
|
|
bestWidth = skyLine[i].width;
|
|
newNode.x = skyLine[i].x;
|
|
newNode.y = y;
|
|
newNode.width = width;
|
|
newNode.height = height;
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(newNode));
|
|
#endif
|
|
}
|
|
}
|
|
/* if (RectangleFits(i, height, width, y))
|
|
{
|
|
if (y + width < bestHeight || (y + width == bestHeight && skyLine[i].width < bestWidth))
|
|
{
|
|
bestHeight = y + width;
|
|
bestIndex = i;
|
|
bestWidth = skyLine[i].width;
|
|
newNode.x = skyLine[i].x;
|
|
newNode.y = y;
|
|
newNode.width = height;
|
|
newNode.height = width;
|
|
assert(disjointRects.Disjoint(newNode));
|
|
}
|
|
}
|
|
*/ }
|
|
|
|
return newNode;
|
|
}
|
|
|
|
Rect SkylineBinPack::InsertMinWaste(int width, int height)
|
|
{
|
|
int bestHeight;
|
|
int bestWastedArea;
|
|
int bestIndex;
|
|
Rect newNode = FindPositionForNewNodeMinWaste(width, height, bestHeight, bestWastedArea, bestIndex);
|
|
|
|
if (bestIndex != -1)
|
|
{
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(newNode));
|
|
#endif
|
|
// Perform the actual packing.
|
|
AddSkylineLevel(bestIndex, newNode);
|
|
|
|
usedSurfaceArea += width * height;
|
|
#ifdef _DEBUG
|
|
disjointRects.Add(newNode);
|
|
#endif
|
|
}
|
|
else
|
|
memset(&newNode, 0, sizeof(newNode));
|
|
|
|
return newNode;
|
|
}
|
|
|
|
Rect SkylineBinPack::FindPositionForNewNodeMinWaste(int width, int height, int &bestHeight, int &bestWastedArea, int &bestIndex) const
|
|
{
|
|
bestHeight = INT_MAX;
|
|
bestWastedArea = INT_MAX;
|
|
bestIndex = -1;
|
|
Rect newNode;
|
|
memset(&newNode, 0, sizeof(newNode));
|
|
for(unsigned i = 0; i < skyLine.Size(); ++i)
|
|
{
|
|
int y;
|
|
int wastedArea;
|
|
|
|
if (RectangleFits(i, width, height, y, wastedArea))
|
|
{
|
|
if (wastedArea < bestWastedArea || (wastedArea == bestWastedArea && y + height < bestHeight))
|
|
{
|
|
bestHeight = y + height;
|
|
bestWastedArea = wastedArea;
|
|
bestIndex = i;
|
|
newNode.x = skyLine[i].x;
|
|
newNode.y = y;
|
|
newNode.width = width;
|
|
newNode.height = height;
|
|
#ifdef _DEBUG
|
|
assert(disjointRects.Disjoint(newNode));
|
|
#endif
|
|
}
|
|
}
|
|
/* if (RectangleFits(i, height, width, y, wastedArea))
|
|
{
|
|
if (wastedArea < bestWastedArea || (wastedArea == bestWastedArea && y + width < bestHeight))
|
|
{
|
|
bestHeight = y + width;
|
|
bestWastedArea = wastedArea;
|
|
bestIndex = i;
|
|
newNode.x = skyLine[i].x;
|
|
newNode.y = y;
|
|
newNode.width = height;
|
|
newNode.height = width;
|
|
assert(disjointRects.Disjoint(newNode));
|
|
}
|
|
}*/
|
|
}
|
|
|
|
return newNode;
|
|
}
|
|
|
|
/// Computes the ratio of used surface area.
|
|
float SkylineBinPack::Occupancy() const
|
|
{
|
|
return (float)usedSurfaceArea / (binWidth * binHeight);
|
|
}
|