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https://github.com/ZDoom/gzdoom-gles.git
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bf31d66d31
- The old algorithm is something I threw together that produced decent, but not spectacular results since it had a tendency to waste space by forcing everything onto "shelves". The new packer is the Skyline-MinWaste-WasteMap-BestFirstFit algorithm described by Jukka Jylanki in his paper *A Thousand Ways to Pack the Bin - A Practical Approach to Two-Dimensional Rectangle Bin Packing*, which can currently be read at http://clb.demon.fi/files/RectangleBinPack.pdf This is minus the optimization to rotate rectangles to make better fits.
94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
/** @file Rect.h
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@author Jukka Jylänki
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This work is released to Public Domain, do whatever you want with it.
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*/
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#pragma once
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#include <vector>
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struct RectSize
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{
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int width;
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int height;
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};
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struct Rect
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{
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int x;
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int y;
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int width;
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int height;
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};
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/// Performs a lexicographic compare on (rect short side, rect long side).
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/// @return -1 if the smaller side of a is shorter than the smaller side of b, 1 if the other way around.
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/// If they are equal, the larger side length is used as a tie-breaker.
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/// If the rectangles are of same size, returns 0.
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int CompareRectShortSide(const Rect &a, const Rect &b);
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/// Performs a lexicographic compare on (x, y, width, height).
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int NodeSortCmp(const Rect &a, const Rect &b);
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/// Returns true if a is contained in b.
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bool IsContainedIn(const Rect &a, const Rect &b);
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#ifdef _DEBUG
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class DisjointRectCollection
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{
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public:
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TArray<Rect> rects;
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bool Add(const Rect &r)
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{
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// Degenerate rectangles are ignored.
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if (r.width == 0 || r.height == 0)
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return true;
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if (!Disjoint(r))
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return false;
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rects.Push(r);
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return true;
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}
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bool Del(const Rect &r)
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{
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for(unsigned i = 0; i < rects.Size(); ++i)
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{
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if(r.x == rects[i].x && r.y == rects[i].y && r.width == rects[i].width && r.height == rects[i].height)
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{
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rects.Delete(i);
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return true;
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}
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}
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return false;
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}
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void Clear()
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{
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rects.Clear();
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}
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bool Disjoint(const Rect &r) const
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{
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// Degenerate rectangles are ignored.
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if (r.width == 0 || r.height == 0)
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return true;
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for(unsigned i = 0; i < rects.Size(); ++i)
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if (!Disjoint(rects[i], r))
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return false;
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return true;
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}
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static bool Disjoint(const Rect &a, const Rect &b)
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{
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if (a.x + a.width <= b.x ||
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b.x + b.width <= a.x ||
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a.y + a.height <= b.y ||
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b.y + b.height <= a.y)
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return true;
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return false;
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}
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};
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#endif
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