godot/thirdparty/thekla_atlas/nvmesh/param/AtlasPacker.h

// This code is in the public domain -- castano@gmail.com

#pragma once
#ifndef NV_MESH_ATLASPACKER_H
#define NV_MESH_ATLASPACKER_H

#include "nvcore/RadixSort.h"
#include "nvmath/Vector.h"
#include "nvmath/Random.h"
#include "nvimage/BitMap.h"
#include "nvimage/Image.h"

#include "nvmesh/nvmesh.h"


namespace nv
{
    class Atlas;
    class Chart;

    struct AtlasPacker
    {
        AtlasPacker(Atlas * atlas);
        ~AtlasPacker();

        void packCharts(int quality, float texelArea, bool blockAligned, bool conservative);
        float computeAtlasUtilization() const;

    private:

        void findChartLocation(int quality, const BitMap * bitmap, Vector2::Arg extents, int w, int h, int * best_x, int * best_y, int * best_w, int * best_h, int * best_r);
        void findChartLocation_bruteForce(const BitMap * bitmap, Vector2::Arg extents, int w, int h, int * best_x, int * best_y, int * best_w, int * best_h, int * best_r);
        void findChartLocation_random(const BitMap * bitmap, Vector2::Arg extents, int w, int h, int * best_x, int * best_y, int * best_w, int * best_h, int * best_r, int minTrialCount);

        void drawChartBitmapDilate(const Chart * chart, BitMap * bitmap, int padding);
        void drawChartBitmap(const Chart * chart, BitMap * bitmap, const Vector2 & scale, const Vector2 & offset);
        
        bool canAddChart(const BitMap * bitmap, int w, int h, int x, int y, int r);
        void addChart(const BitMap * bitmap, int w, int h, int x, int y, int r, Image * debugOutput);
        //void checkCanAddChart(const Chart * chart, int w, int h, int x, int y, int r);
        void addChart(const Chart * chart, int w, int h, int x, int y, int r, Image * debugOutput);
        

        static bool checkBitsCallback(void * param, int x, int y, Vector3::Arg bar, Vector3::Arg dx, Vector3::Arg dy, float coverage);
        static bool setBitsCallback(void * param, int x, int y, Vector3::Arg bar, Vector3::Arg dx, Vector3::Arg dy, float coverage);

    private:

        Atlas * m_atlas;
        BitMap m_bitmap;
        Image m_debug_bitmap;
        RadixSort m_radix;

        uint m_width;
        uint m_height;
        
        MTRand m_rand;
       
    };

} // nv namespace

#endif // NV_MESH_ATLASPACKER_H