mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-07-08 11:40:43 +02:00
432 lines
10 KiB
JavaScript
Executable File
432 lines
10 KiB
JavaScript
Executable File
/*
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* @author Daosheng Mu / https://github.com/DaoshengMu/
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* @author mrdoob / http://mrdoob.com/
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*/
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THREE.TGALoader = 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.TGALoader.prototype = Object.create( THREE.BinaryTextureLoader.prototype );
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// reference from vthibault, https://github.com/vthibault/roBrowser/blob/master/src/Loaders/Targa.js
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THREE.TGALoader.prototype._parser = function ( buffer ) {
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// TGA Constants
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var TGA_TYPE_NO_DATA = 0,
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TGA_TYPE_INDEXED = 1,
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TGA_TYPE_RGB = 2,
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TGA_TYPE_GREY = 3,
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TGA_TYPE_RLE_INDEXED = 9,
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TGA_TYPE_RLE_RGB = 10,
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TGA_TYPE_RLE_GREY = 11,
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TGA_ORIGIN_MASK = 0x30,
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TGA_ORIGIN_SHIFT = 0x04,
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TGA_ORIGIN_BL = 0x00,
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TGA_ORIGIN_BR = 0x01,
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TGA_ORIGIN_UL = 0x02,
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TGA_ORIGIN_UR = 0x03;
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if ( buffer.length < 19 )
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console.error( 'THREE.TGALoader.parse: Not enough data to contain header.' );
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var content = new Uint8Array( buffer ),
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offset = 0,
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header = {
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id_length: content[ offset ++ ],
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colormap_type: content[ offset ++ ],
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image_type: content[ offset ++ ],
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colormap_index: content[ offset ++ ] | content[ offset ++ ] << 8,
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colormap_length: content[ offset ++ ] | content[ offset ++ ] << 8,
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colormap_size: content[ offset ++ ],
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origin: [
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content[ offset ++ ] | content[ offset ++ ] << 8,
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content[ offset ++ ] | content[ offset ++ ] << 8
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],
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width: content[ offset ++ ] | content[ offset ++ ] << 8,
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height: content[ offset ++ ] | content[ offset ++ ] << 8,
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pixel_size: content[ offset ++ ],
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flags: content[ offset ++ ]
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};
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function tgaCheckHeader( header ) {
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switch ( header.image_type ) {
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// Check indexed type
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case TGA_TYPE_INDEXED:
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case TGA_TYPE_RLE_INDEXED:
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if ( header.colormap_length > 256 || header.colormap_size !== 24 || header.colormap_type !== 1) {
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console.error('THREE.TGALoader.parse.tgaCheckHeader: Invalid type colormap data for indexed type');
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}
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break;
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// Check colormap type
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case TGA_TYPE_RGB:
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case TGA_TYPE_GREY:
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case TGA_TYPE_RLE_RGB:
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case TGA_TYPE_RLE_GREY:
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if (header.colormap_type) {
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console.error('THREE.TGALoader.parse.tgaCheckHeader: Invalid type colormap data for colormap type');
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}
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break;
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// What the need of a file without data ?
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case TGA_TYPE_NO_DATA:
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console.error('THREE.TGALoader.parse.tgaCheckHeader: No data');
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// Invalid type ?
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default:
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console.error('THREE.TGALoader.parse.tgaCheckHeader: Invalid type " ' + header.image_type + '"');
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}
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// Check image width and height
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if ( header.width <= 0 || header.height <= 0 ) {
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console.error( 'THREE.TGALoader.parse.tgaCheckHeader: Invalid image size' );
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}
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// Check image pixel size
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if (header.pixel_size !== 8 &&
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header.pixel_size !== 16 &&
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header.pixel_size !== 24 &&
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header.pixel_size !== 32) {
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console.error('THREE.TGALoader.parse.tgaCheckHeader: Invalid pixel size "' + header.pixel_size + '"');
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}
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}
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// Check tga if it is valid format
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tgaCheckHeader( header );
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if ( header.id_length + offset > buffer.length ) {
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console.error('THREE.TGALoader.parse: No data');
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}
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// Skip the needn't data
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offset += header.id_length;
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// Get targa information about RLE compression and palette
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var use_rle = false,
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use_pal = false,
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use_grey = false;
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switch ( header.image_type ) {
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case TGA_TYPE_RLE_INDEXED:
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use_rle = true;
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use_pal = true;
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break;
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case TGA_TYPE_INDEXED:
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use_pal = true;
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break;
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case TGA_TYPE_RLE_RGB:
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use_rle = true;
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break;
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case TGA_TYPE_RGB:
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break;
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case TGA_TYPE_RLE_GREY:
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use_rle = true;
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use_grey = true;
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break;
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case TGA_TYPE_GREY:
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use_grey = true;
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break;
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}
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// Parse tga image buffer
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function tgaParse( use_rle, use_pal, header, offset, data ) {
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var pixel_data,
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pixel_size,
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pixel_total,
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palettes;
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pixel_size = header.pixel_size >> 3;
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pixel_total = header.width * header.height * pixel_size;
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// Read palettes
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if ( use_pal ) {
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palettes = data.subarray( offset, offset += header.colormap_length * ( header.colormap_size >> 3 ) );
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}
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// Read RLE
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if ( use_rle ) {
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pixel_data = new Uint8Array(pixel_total);
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var c, count, i;
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var shift = 0;
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var pixels = new Uint8Array(pixel_size);
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while (shift < pixel_total) {
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c = data[offset ++];
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count = (c & 0x7f) + 1;
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// RLE pixels.
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if (c & 0x80) {
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// Bind pixel tmp array
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for (i = 0; i < pixel_size; ++ i) {
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pixels[i] = data[offset ++];
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}
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// Copy pixel array
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for (i = 0; i < count; ++ i) {
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pixel_data.set(pixels, shift + i * pixel_size);
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}
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shift += pixel_size * count;
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} else {
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// Raw pixels.
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count *= pixel_size;
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for (i = 0; i < count; ++ i) {
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pixel_data[shift + i] = data[offset ++];
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}
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shift += count;
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}
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}
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} else {
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// RAW Pixels
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pixel_data = data.subarray(
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offset, offset += (use_pal ? header.width * header.height : pixel_total)
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);
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}
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return {
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pixel_data: pixel_data,
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palettes: palettes
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};
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}
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function tgaGetImageData8bits(imageData, y_start, y_step, y_end, x_start, x_step, x_end, image, palettes) {
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var colormap = palettes;
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var color, i = 0, x, y;
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var width = header.width;
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for (y = y_start; y !== y_end; y += y_step) {
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for (x = x_start; x !== x_end; x += x_step, i ++) {
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color = image[i];
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imageData[(x + width * y) * 4 + 3] = 255;
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imageData[(x + width * y) * 4 + 2] = colormap[(color * 3) + 0];
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imageData[(x + width * y) * 4 + 1] = colormap[(color * 3) + 1];
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imageData[(x + width * y) * 4 + 0] = colormap[(color * 3) + 2];
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}
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}
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return imageData;
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};
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function tgaGetImageData16bits(imageData, y_start, y_step, y_end, x_start, x_step, x_end, image) {
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var color, i = 0, x, y;
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var width = header.width;
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for (y = y_start; y !== y_end; y += y_step) {
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for (x = x_start; x !== x_end; x += x_step, i += 2) {
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color = image[i + 0] + (image[i + 1] << 8); // Inversed ?
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imageData[(x + width * y) * 4 + 0] = (color & 0x7C00) >> 7;
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imageData[(x + width * y) * 4 + 1] = (color & 0x03E0) >> 2;
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imageData[(x + width * y) * 4 + 2] = (color & 0x001F) >> 3;
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imageData[(x + width * y) * 4 + 3] = (color & 0x8000) ? 0 : 255;
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}
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}
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return imageData;
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};
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function tgaGetImageData24bits(imageData, y_start, y_step, y_end, x_start, x_step, x_end, image) {
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var i = 0, x, y;
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var width = header.width;
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for (y = y_start; y !== y_end; y += y_step) {
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for (x = x_start; x !== x_end; x += x_step, i += 3) {
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imageData[(x + width * y) * 4 + 3] = 255;
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imageData[(x + width * y) * 4 + 2] = image[i + 0];
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imageData[(x + width * y) * 4 + 1] = image[i + 1];
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imageData[(x + width * y) * 4 + 0] = image[i + 2];
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}
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}
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return imageData;
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};
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function tgaGetImageData32bits(imageData, y_start, y_step, y_end, x_start, x_step, x_end, image) {
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var i = 0, x, y;
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var width = header.width;
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for (y = y_start; y !== y_end; y += y_step) {
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for (x = x_start; x !== x_end; x += x_step, i += 4) {
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imageData[(x + width * y) * 4 + 2] = image[i + 0];
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imageData[(x + width * y) * 4 + 1] = image[i + 1];
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imageData[(x + width * y) * 4 + 0] = image[i + 2];
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imageData[(x + width * y) * 4 + 3] = image[i + 3];
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}
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}
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return imageData;
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};
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function tgaGetImageDataGrey8bits( imageData, y_start, y_step, y_end, x_start, x_step, x_end, image ) {
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var color, i = 0, x, y;
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var width = header.width;
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for (y = y_start; y !== y_end; y += y_step) {
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for (x = x_start; x !== x_end; x += x_step, i ++) {
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color = image[i];
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imageData[(x + width * y) * 4 + 0] = color;
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imageData[(x + width * y) * 4 + 1] = color;
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imageData[(x + width * y) * 4 + 2] = color;
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imageData[(x + width * y) * 4 + 3] = 255;
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}
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}
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return imageData;
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};
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function tgaGetImageDataGrey16bits(imageData, y_start, y_step, y_end, x_start, x_step, x_end, image) {
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var i = 0, x, y;
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var width = header.width;
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for (y = y_start; y !== y_end; y += y_step) {
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for (x = x_start; x !== x_end; x += x_step, i += 2) {
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imageData[(x + width * y) * 4 + 0] = image[i + 0];
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imageData[(x + width * y) * 4 + 1] = image[i + 0];
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imageData[(x + width * y) * 4 + 2] = image[i + 0];
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imageData[(x + width * y) * 4 + 3] = image[i + 1];
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}
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}
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return imageData;
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};
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function getTgaRGBA( width, height, image, palette ) {
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var x_start,
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y_start,
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x_step,
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y_step,
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x_end,
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y_end,
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data = new Uint8Array(width * height * 4);
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switch ( (header.flags & TGA_ORIGIN_MASK) >> TGA_ORIGIN_SHIFT ) {
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default:
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case TGA_ORIGIN_UL:
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x_start = 0;
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x_step = 1;
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x_end = width;
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y_start = 0;
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y_step = 1;
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y_end = height;
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break;
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case TGA_ORIGIN_BL:
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x_start = 0;
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x_step = 1;
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x_end = width;
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y_start = height - 1;
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y_step = -1;
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y_end = -1;
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break;
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case TGA_ORIGIN_UR:
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x_start = width - 1;
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x_step = -1;
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x_end = -1;
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y_start = 0;
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y_step = 1;
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y_end = height;
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break;
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case TGA_ORIGIN_BR:
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x_start = width - 1;
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x_step = -1;
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x_end = -1;
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y_start = height - 1;
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y_step = -1;
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y_end = -1;
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break;
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}
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if ( use_grey ) {
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switch ( header.pixel_size ) {
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case 8:
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tgaGetImageDataGrey8bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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case 16:
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tgaGetImageDataGrey16bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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default:
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console.error( 'THREE.TGALoader.parse.getTgaRGBA: not support this format' );
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break;
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}
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} else {
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switch ( header.pixel_size ) {
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case 8:
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tgaGetImageData8bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image, palette );
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break;
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case 16:
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tgaGetImageData16bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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case 24:
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tgaGetImageData24bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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case 32:
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tgaGetImageData32bits( data, y_start, y_step, y_end, x_start, x_step, x_end, image );
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break;
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default:
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console.error( 'THREE.TGALoader.parse.getTgaRGBA: not support this format' );
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break;
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}
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}
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// Load image data according to specific method
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// var func = 'tgaGetImageData' + (use_grey ? 'Grey' : '') + (header.pixel_size) + 'bits';
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// func(data, y_start, y_step, y_end, x_start, x_step, x_end, width, image, palette );
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return data;
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}
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var result = tgaParse( use_rle, use_pal, header, offset, content );
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var rgbaData = getTgaRGBA( header.width, header.height, result.pixel_data, result.palettes );
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return {
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width: header.width,
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height: header.height,
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data: rgbaData
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};
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};
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