Doodle3D-Slicer/three.js-master/examples/js/loaders/TGALoader.js
2015-06-12 15:58:26 +02:00

432 lines
10 KiB
JavaScript
Executable File

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