ByteMap.h

#pragma once

#include <algorithm>
#include <math.h>

#include <CMisc.h>

#include "Mipmapable.h"

class ByteMap : public Mipmapable<ByteMap>
{
public:
    ByteMap::ByteMap(int width, int height) {
        if (width < 1 || height < 1)
            THROW("Error: Bad dimensions (" << width << "x" << height << ") on ByteMap; must be at least 1x1.");
        w = width;
        h = height;
        data = (BYTE*) malloc(sizeof(BYTE) * w * h);
    }

    ByteMap::~ByteMap(void) {
        free(data);
    }

    void setByte(int x, int y, BYTE b) {
        data[x + y * h] = b;
    }

    BYTE getByte(int x, int y) {
        return data[x + y * h];
    }

    int getWidth() {
        return w;
    }

    int getHeight() {
        return h;
    }

    /*bool canShrink() {
        return (w / 2 * 2 == w) && (h / 2 * 2 == h);
    }*/

    ByteMap* makeMipMap(void) {
        int width = w / 2;
        int height = h / 2;
        ByteMap* mipMap = new ByteMap(width, height);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                BYTE interpolatedColorCorrected
                    = (BYTE)((int)getByte(2 * x, 2 * y)
                    + (int)getByte(2 * x + 1, 2 * y)
                    + (int)getByte(2 * x, 2 * y + 1)
                    + (int)getByte(2 * x + 1, 2 * y + 1) / 4);
                mipMap->setByte(x, y, interpolatedColorCorrected);
            }
        }
        return mipMap;
    }

private:
    int w;
    int h;
    BYTE* data;
};