# all files / src/util/ hdr.js

70.75% Statements 75/106
60% Branches 21/35
57.14% Functions 4/7
72.12% Lines 75/104

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     import Texture from '../Texture';
    import Texture2D from '../Texture2D';
    var toChar = String.fromCharCode;

    var MINELEN = 8;
    var MAXELEN = 0x7fff;
    function rgbe2float(rgbe, buffer, offset, exposure) {
        if (rgbe[3] > 0) {
            var f = Math.pow(2.0, rgbe[3] - 128 - 8 + exposure);
            buffer[offset + 0] = rgbe[0] * f;
            buffer[offset + 1] = rgbe[1] * f;
            buffer[offset + 2] = rgbe[2] * f;
        }
        else {
            buffer[offset + 0] = 0;
            buffer[offset + 1] = 0;
            buffer[offset + 2] = 0;
        }
        buffer[offset + 3] = 1.0;
        return buffer;
    }

    function uint82string(array, offset, size) {
        var str = '';
        for (var i = offset; i < size; i++) {
            str += toChar(array[i]);
        }
        return str;
    }

    function copyrgbe(s, t) {
        t[0] = s[0];
        t[1] = s[1];
        t[2] = s[2];
        t[3] = s[3];
    }

    // TODO : check
    function oldReadColors(scan, buffer, offset, xmax) {
        var rshift = 0, x = 0, len = xmax;
        while (len > 0) {
            scan[x][0] = buffer[offset++];
            scan[x][1] = buffer[offset++];
            scan[x][2] = buffer[offset++];
            scan[x][3] = buffer[offset++];
            if (scan[x][0] === 1 && scan[x][1] === 1 && scan[x][2] === 1) {
                // exp is count of repeated pixels
                for (var i = (scan[x][3] << rshift) >>> 0; i > 0; i--) {
                    copyrgbe(scan[x-1], scan[x]);
                    x++;
                    len--;
                }
                rshift += 8;
            } else {
                x++;
                len--;
                rshift = 0;
            }
        }
        return offset;
    }

    function readColors(scan, buffer, offset, xmax) {
        Iif ((xmax < MINELEN) | (xmax > MAXELEN)) {
            return oldReadColors(scan, buffer, offset, xmax);
        }
        var i = buffer[offset++];
        Iif (i != 2) {
            return oldReadColors(scan, buffer, offset - 1, xmax);
        }
        scan[0][1] = buffer[offset++];
        scan[0][2] = buffer[offset++];

        i = buffer[offset++];
        Iif ((((scan[0][2] << 8) >>> 0) | i) >>> 0 !== xmax) {
            return null;
        }
        for (var i = 0; i < 4; i++) {
            for (var x = 0; x < xmax;) {
                var code = buffer[offset++];
                if (code > 128) {
                    code = (code & 127) >>> 0;
                    var val = buffer[offset++];
                    while (code--) {
                        scan[x++][i] = val;
                    }
                } else {
                    while (code--) {
                        scan[x++][i] = buffer[offset++];
                    }
                }
            }
        }
        return offset;
    }

    var ret = {
        // http://www.graphics.cornell.edu/~bjw/rgbe.html
        // Blender source
        // http://radsite.lbl.gov/radiance/refer/Notes/picture_format.html
        parseRGBE: function(arrayBuffer, texture, exposure) {
            Iif (exposure == null) {
                exposure = 0;
            }
            var data = new Uint8Array(arrayBuffer);
            var size = data.length;
            Iif (uint82string(data, 0, 2) !== '#?') {
                return;
            }
            // find empty line, next line is resolution info
            for (var i = 2; i < size; i++) {
                if (toChar(data[i]) === '\n' && toChar(data[i+1]) === '\n') {
                    break;
                }
            }
            Iif (i >= size) { // not found
                return;
            }
            // find resolution info line
            i += 2;
            var str = '';
            for (; i < size; i++) {
                var _char = toChar(data[i]);
                if (_char === '\n') {
                    break;
                }
                str += _char;
            }
            // -Y M +X N
            var tmp = str.split(' ');
            var height = parseInt(tmp[1]);
            var width = parseInt(tmp[3]);
            Iif (!width || !height) {
                return;
            }

            // read and decode actual data
            var offset = i+1;
            var scanline = [];
            // memzero
            for (var x = 0; x < width; x++) {
                scanline[x] = [];
                for (var j = 0; j < 4; j++) {
                    scanline[x][j] = 0;
                }
            }
            var pixels = new Float32Array(width * height * 4);
            var offset2 = 0;
            for (var y = 0; y < height; y++) {
                var offset = readColors(scanline, data, offset, width);
                Iif (!offset) {
                    return null;
                }
                for (var x = 0; x < width; x++) {
                    rgbe2float(scanline[x], pixels, offset2, exposure);
                    offset2 += 4;
                }
            }

            Iif (!texture) {
                texture = new Texture2D();
            }
            texture.width = width;
            texture.height = height;
            texture.pixels = pixels;
            // HALF_FLOAT can't use Float32Array
            texture.type = Texture.FLOAT;
            return texture;
        },

        parseRGBEFromPNG: function(png) {

        }
    };

    export default ret;