Genome2D > ATF v1.2 fix

/**
 * Code by rodrigolopezpeker (aka 7interactive™) on 1/15/14 11:12 AM.
 */
package genome {
import com.genome2d.error.GError;
import com.genome2d.textures.GTexture;
import com.genome2d.textures.GTextureAtlas;
import com.genome2d.textures.GTextureSourceType;

import flash.geom.Rectangle;

import flash.utils.ByteArray;

public class GUtils {

    static public function createTextureFromATF(p_id:String, p_atfData:ByteArray, p_uploadCallback:Function = null):GTexture {
        var atf:String = String.fromCharCode(p_atfData[0], p_atfData[1], p_atfData[2]);
        if (atf != "ATF") throw new GError(GError.INVALID_ATF_DATA);
        var type:int;
        var transparent:Boolean = true;
        var offset:int = p_atfData[6] == 255 ? 12 : 6;
        switch (p_atfData[offset]) {
            case 0:
            case 1:
                type = GTextureSourceType.ATF_BGRA;
                break;
            case 2:
            case 3:
                type = GTextureSourceType.ATF_COMPRESSED;
                transparent = false;
                break;
            case 4:
            case 5:
                type = GTextureSourceType.ATF_COMPRESSEDALPHA;
                break;
        }
        var width:int = Math.pow(2, p_atfData[int(++offset)]);
        var height:int = Math.pow(2, p_atfData[int(++offset)]);
        return new GTexture(p_id, type, p_atfData, new Rectangle(0, 0, width, height), transparent, 0, 0, p_uploadCallback);
    }

    static public function createTextureAtlasFromATFAndXML(p_id:String, p_atfData:ByteArray, p_xml:XML, p_uploadCallback:Function = null):GTextureAtlas {
        var atf:String = String.fromCharCode(p_atfData[0], p_atfData[1], p_atfData[2]);
        if (atf != "ATF") throw new GError(GError.INVALID_ATF_DATA);
        var type:int;
        var offset:int = p_atfData[6] == 255 ? 12 : 6;
        var transparent:Boolean = true;
        switch (p_atfData[offset]) {
            case 0:
            case 1:
                type = GTextureSourceType.ATF_BGRA;
                break;
            case 2:
            case 3:
                type = GTextureSourceType.ATF_COMPRESSED;
                transparent = false;
                break;
            case 4:
            case 5:
                type = GTextureSourceType.ATF_COMPRESSEDALPHA;
                break;
            // with older versions
            default:
                throw new Error("Invalid ATF format");
        }
        // ATF V1.0 > index 7 width / 8 height
        // ATF V1.2 > index 13 width / 14 height
        var width:int = Math.pow(2, p_atfData[int(++offset)]);
        var height:int = Math.pow(2, p_atfData[int(++offset)]);
        var textureAtlas:GTextureAtlas = new GTextureAtlas(p_id, type, width, height, p_atfData, transparent, p_uploadCallback);
        for (var i:int = 0; i < p_xml.children().length(); ++i) {
            var node:XML = p_xml.children()[i];
            var region:Rectangle = new Rectangle(int(node.@x), int(node.@y), int(node.@width), int(node.@height));
            var pivotX:Number = (node.@frameX == undefined && node.@frameWidth == undefined) ? 0 : Number(node.@frameWidth - region.width) / 2 + Number(node.@frameX);
            var pivotY:Number = (node.@frameY == undefined && node.@frameHeight == undefined) ? 0 : Number(node.@frameHeight - region.height) / 2 + Number(node.@frameY);
            textureAtlas.addSubTexture(node.@name, region, pivotX, pivotY);
        }
        textureAtlas.invalidate();
        return textureAtlas;
    }
}
}