jsdoom-old/patch.js at master · Technochips/jsdoom-old · GitHub

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var patches = [];
class Patch
{
	lump;
	width;
	height;
	xOffset;
	yOffset;
	img;
	columns;
	constructor(lump)
	{
		this.lump = lump;
		this.width = lump.lumpDataView.getUint16(0, true);
		this.height = lump.lumpDataView.getUint16(2, true);
		this.xOffset = lump.lumpDataView.getInt16(4, true);
		this.yOffset = lump.lumpDataView.getInt16(6, true);
		this.img = [];

		this.columns = [];

		for(var i = 0; i < this.width; i++)
		{
			this.img[i] = [];
			for(var y = 0; y < this.height; y++)
			{
				this.img[i][y] = -1; //transparency
			}
			this.columns[i] = [];
			this.columns[i].offset = lump.lumpDataView.getUint32(8+(i*4), true);

			var topdelta = 0x00;
			var length = 0;
			for(var k = 0; topdelta < 0xFF; k++)
			{
				topdelta = lump.lumpDataView.getUint8(this.columns[i].offset+length);
				if(topdelta >= 0xFF) break;
				this.columns[i][k] = {};
				this.columns[i][k].topdelta = topdelta;
				this.columns[i][k].size = lump.lumpDataView.getUint8(this.columns[i].offset+length+1);
				this.columns[i][k].data = [];
				for(var j = 0; j < this.columns[i][k].size; j++)
				{
					this.columns[i][k].data[j] = lump.lumpDataView.getUint8(this.columns[i].offset+length+3+j);
					if(topdelta+j < this.height)
						this.img[i][topdelta+j] = this.columns[i][k].data[j];
				}
				length += this.columns[i][k].size+4
			}
			if(topdelta >= 0xFF) continue;
		}
	}

	static precachePatch(lump)
	{
		if(!patches[lump] && wad)
		{
			var l = wad.getLastLump(lump);
			if(l) patches[lump] = new Patch(l);
		}
		return patches[lump];
	}
	static getPatch(patch)
	{
		return Patch.precachePatch(patch);
	}
	static drawPatch(patch, x, y)
	{
		var p = Patch.getPatch(patch);
		if(p)
		{
			for(var w = 0; w < p.width; w++)
			{
				for(var h = 0; h < p.height; h++)
				{
					if(p.img[w][h] >= 0)
					{
						graphics.drawPixel(p.img[w][h],x+w-p.xOffset,y+h-p.yOffset)
					}
				}
			}
		}
		return p;
	}
}