mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-12-25 20:33:50 +01:00
304 lines
9.1 KiB
JavaScript
304 lines
9.1 KiB
JavaScript
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/**
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* @author Nikos M. / https://github.com/foo123/
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*/
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// https://github.com/mrdoob/three.js/issues/5552
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// http://en.wikipedia.org/wiki/RGBE_image_format
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THREE.HDRLoader = THREE.RGBELoader = function ( manager ) {
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this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
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};
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// extend THREE.BinaryTextureLoader
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THREE.RGBELoader.prototype = Object.create( THREE.BinaryTextureLoader.prototype );
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// adapted from http://www.graphics.cornell.edu/~bjw/rgbe.html
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THREE.RGBELoader.prototype._parser = function( buffer ) {
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var
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/* return codes for rgbe routines */
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RGBE_RETURN_SUCCESS = 0,
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RGBE_RETURN_FAILURE = -1,
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/* default error routine. change this to change error handling */
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rgbe_read_error = 1,
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rgbe_write_error = 2,
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rgbe_format_error = 3,
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rgbe_memory_error = 4,
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rgbe_error = function(rgbe_error_code, msg) {
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switch (rgbe_error_code) {
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case rgbe_read_error: console.error("THREE.RGBELoader Read Error: " + (msg||''));
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break;
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case rgbe_write_error: console.error("THREE.RGBELoader Write Error: " + (msg||''));
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break;
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case rgbe_format_error: console.error("THREE.RGBELoader Bad File Format: " + (msg||''));
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break;
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default:
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case rgbe_memory_error: console.error("THREE.RGBELoader: Error: " + (msg||''));
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}
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return RGBE_RETURN_FAILURE;
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},
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/* offsets to red, green, and blue components in a data (float) pixel */
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RGBE_DATA_RED = 0,
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RGBE_DATA_GREEN = 1,
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RGBE_DATA_BLUE = 2,
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/* number of floats per pixel, use 4 since stored in rgba image format */
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RGBE_DATA_SIZE = 4,
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/* flags indicating which fields in an rgbe_header_info are valid */
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RGBE_VALID_PROGRAMTYPE = 1,
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RGBE_VALID_FORMAT = 2,
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RGBE_VALID_DIMENSIONS = 4,
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NEWLINE = "\n",
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fgets = function( buffer, lineLimit, consume ) {
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lineLimit = !lineLimit ? 1024 : lineLimit;
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var p = buffer.pos,
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i = -1, len = 0, s = '', chunkSize = 128,
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chunk = String.fromCharCode.apply(null, new Uint16Array( buffer.subarray( p, p + chunkSize ) ) )
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;
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while ( (0 > (i = chunk.indexOf( NEWLINE ))) && (len < lineLimit) && (p < buffer.byteLength) ) {
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s += chunk; len += chunk.length;
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p += chunkSize;
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chunk += String.fromCharCode.apply(null, new Uint16Array( buffer.subarray( p, p + chunkSize ) ) );
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}
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if ( -1 < i ) {
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/*for (i=l-1; i>=0; i--) {
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byteCode = m.charCodeAt(i);
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if (byteCode > 0x7f && byteCode <= 0x7ff) byteLen++;
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else if (byteCode > 0x7ff && byteCode <= 0xffff) byteLen += 2;
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if (byteCode >= 0xDC00 && byteCode <= 0xDFFF) i--; //trail surrogate
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}*/
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if ( false !== consume ) buffer.pos += len + i + 1;
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return s + chunk.slice(0, i);
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}
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return false;
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},
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/* minimal header reading. modify if you want to parse more information */
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RGBE_ReadHeader = function( buffer ) {
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var line, match,
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// regexes to parse header info fields
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magic_token_re = /^#\?(\S+)$/,
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gamma_re = /^\s*GAMMA\s*=\s*(\d+(\.\d+)?)\s*$/,
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exposure_re = /^\s*EXPOSURE\s*=\s*(\d+(\.\d+)?)\s*$/,
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format_re = /^\s*FORMAT=(\S+)\s*$/,
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dimensions_re = /^\s*\-Y\s+(\d+)\s+\+X\s+(\d+)\s*$/,
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// RGBE format header struct
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header = {
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valid: 0, /* indicate which fields are valid */
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string: '', /* the actual header string */
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comments: '', /* comments found in header */
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programtype: 'RGBE', /* listed at beginning of file to identify it
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* after "#?". defaults to "RGBE" */
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format: '', /* RGBE format, default 32-bit_rle_rgbe */
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gamma: 1.0, /* image has already been gamma corrected with
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* given gamma. defaults to 1.0 (no correction) */
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exposure: 1.0, /* a value of 1.0 in an image corresponds to
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* <exposure> watts/steradian/m^2.
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* defaults to 1.0 */
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width: 0, height: 0 /* image dimensions, width/height */
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}
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;
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if ( buffer.pos >= buffer.byteLength || !( line = fgets( buffer ) ) ) {
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return rgbe_error( rgbe_read_error, "no header found" );
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}
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/* if you want to require the magic token then uncomment the next line */
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if ( !(match = line.match(magic_token_re)) ) {
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return rgbe_error( rgbe_format_error, "bad initial token" );
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}
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header.valid |= RGBE_VALID_PROGRAMTYPE;
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header.programtype = match[1];
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header.string += line + "\n";
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while ( true ) {
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line = fgets( buffer );
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if ( false === line ) break;
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header.string += line + "\n";
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if ( '#' === line.charAt(0) ) {
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header.comments += line + "\n";
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continue; // comment line
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}
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if ( match = line.match(gamma_re) ) {
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header.gamma = parseFloat(match[1], 10);
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}
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if ( match = line.match(exposure_re) ) {
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header.exposure = parseFloat(match[1], 10);
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}
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if ( match = line.match(format_re) ) {
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header.valid |= RGBE_VALID_FORMAT;
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header.format = match[1];//'32-bit_rle_rgbe';
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}
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if ( match = line.match(dimensions_re) ) {
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header.valid |= RGBE_VALID_DIMENSIONS;
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header.height = parseInt(match[1], 10);
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header.width = parseInt(match[2], 10);
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}
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if ( (header.valid&RGBE_VALID_FORMAT) && (header.valid&RGBE_VALID_DIMENSIONS) ) break;
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}
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if ( !(header.valid&RGBE_VALID_FORMAT) ) {
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return rgbe_error( rgbe_format_error, "missing format specifier" );
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}
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if ( !(header.valid&RGBE_VALID_DIMENSIONS) ) {
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return rgbe_error( rgbe_format_error, "missing image size specifier" );
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}
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return header;
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},
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RGBE_ReadPixels_RLE = function( buffer, w, h ) {
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var data_rgba, offset, pos, count, byteValue,
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scanline_buffer, ptr, ptr_end, i, l, off, isEncodedRun,
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scanline_width = w, num_scanlines = h, rgbeStart
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;
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if (
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// run length encoding is not allowed so read flat
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((scanline_width < 8) || (scanline_width > 0x7fff)) ||
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// this file is not run length encoded
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((2 !== buffer[0]) || (2 !== buffer[1]) || (buffer[2] & 0x80))
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) {
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// return the flat buffer
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return new Uint8Array( buffer );
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}
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if ( scanline_width !== ((buffer[2]<<8) | buffer[3]) ) {
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return rgbe_error(rgbe_format_error, "wrong scanline width");
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}
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data_rgba = new Uint8Array( 4 * w * h );
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if ( !data_rgba || !data_rgba.length ) {
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return rgbe_error(rgbe_memory_error, "unable to allocate buffer space");
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}
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offset = 0; pos = 0; ptr_end = 4 * scanline_width;
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rgbeStart = new Uint8Array( 4 );
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scanline_buffer = new Uint8Array( ptr_end );
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// read in each successive scanline
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while ( (num_scanlines > 0) && (pos < buffer.byteLength) ) {
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if ( pos + 4 > buffer.byteLength ) {
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return rgbe_error( rgbe_read_error );
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}
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rgbeStart[0] = buffer[pos ++];
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rgbeStart[1] = buffer[pos ++];
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rgbeStart[2] = buffer[pos ++];
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rgbeStart[3] = buffer[pos ++];
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if ( (2 != rgbeStart[0]) || (2 != rgbeStart[1]) || (((rgbeStart[2]<<8) | rgbeStart[3]) != scanline_width) ) {
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return rgbe_error(rgbe_format_error, "bad rgbe scanline format");
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}
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// read each of the four channels for the scanline into the buffer
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// first red, then green, then blue, then exponent
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ptr = 0;
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while ( (ptr < ptr_end) && (pos < buffer.byteLength) ) {
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count = buffer[ pos ++ ];
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isEncodedRun = count > 128;
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if ( isEncodedRun ) count -= 128;
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if ( (0 === count) || (ptr + count > ptr_end) ) {
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return rgbe_error(rgbe_format_error, "bad scanline data");
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}
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if ( isEncodedRun ) {
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// a (encoded) run of the same value
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byteValue = buffer[ pos ++ ];
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for (i = 0; i < count; i ++) {
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scanline_buffer[ ptr ++ ] = byteValue;
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}
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//ptr += count;
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} else {
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// a literal-run
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scanline_buffer.set( buffer.subarray(pos, pos + count), ptr );
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ptr += count; pos += count;
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}
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}
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// now convert data from buffer into rgba
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// first red, then green, then blue, then exponent (alpha)
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l = scanline_width; //scanline_buffer.byteLength;
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for (i = 0; i < l; i ++) {
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off = 0;
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data_rgba[offset] = scanline_buffer[i + off];
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off += scanline_width; //1;
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data_rgba[offset + 1] = scanline_buffer[i + off];
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off += scanline_width; //1;
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data_rgba[offset + 2] = scanline_buffer[i + off];
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off += scanline_width; //1;
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data_rgba[offset + 3] = scanline_buffer[i + off];
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offset += 4;
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}
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num_scanlines --;
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}
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return data_rgba;
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}
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;
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var byteArray = new Uint8Array( buffer ),
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byteLength = byteArray.byteLength;
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byteArray.pos = 0;
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var rgbe_header_info = RGBE_ReadHeader( byteArray );
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if ( RGBE_RETURN_FAILURE !== rgbe_header_info ) {
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var w = rgbe_header_info.width,
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h = rgbe_header_info.height
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,image_rgba_data = RGBE_ReadPixels_RLE( byteArray.subarray(byteArray.pos), w, h )
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;
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if ( RGBE_RETURN_FAILURE !== image_rgba_data ) {
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return {
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width: w, height: h,
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data: image_rgba_data,
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header: rgbe_header_info.string,
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gamma: rgbe_header_info.gamma,
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exposure: rgbe_header_info.exposure,
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format: THREE.RGBEFormat, // handled as THREE.RGBAFormat in shaders
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type: THREE.UnsignedByteType
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};
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}
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}
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return null;
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};
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