import { FileLoader } from './FileLoader.js';
import { DefaultLoadingManager } from './LoadingManager.js';
/**
* A loader for loading a .tga Image.
* @constructor
* @memberof zen3d
* @param {zen3d.LoadingManager} manager — The loadingManager for the loader to use. Default is zen3d.DefaultLoadingManager.
*/
function TGALoader(manager) {
this.manager = (manager !== undefined) ? manager : DefaultLoadingManager;
}
Object.assign(TGALoader.prototype, /** @lends zen3d.TGALoader.prototype */{
/**
* Load the URL and pass the response to the onLoad function.
* @param {string} url — the path or URL to the file. This can also be a Data URI.
* @param {Function} [onLoad=] — Will be called when loading completes. The argument will be the loaded image ( draw to an canvas element ).
* @param {Function} [onProgress=] — Will be called while load progresses. The argument will be the XMLHttpRequest instance, which contains .total and .loaded bytes.
* @param {Function} [onError=] — Will be called if an error occurs.
*/
load: function(url, onLoad, onProgress, onError) {
var that = this;
var loader = new FileLoader(this.manager);
loader.setResponseType('arraybuffer');
loader.load(url, function(buffer) {
if (onLoad !== undefined) {
onLoad(that.parse(buffer));
}
}, onProgress, onError);
},
// reference from vthibault, https://github.com/vthibault/roBrowser/blob/master/src/Loaders/Targa.js
parse: 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('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('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('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('TGALoader.parse.tgaCheckHeader: No data');
// Invalid type ?
default:
console.error('TGALoader.parse.tgaCheckHeader: Invalid type " ' + header.image_type + '"');
}
// Check image width and height
if (header.width <= 0 || header.height <= 0) {
console.error('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('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('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(data, width, height, image, palette) {
var x_start,
y_start,
x_step,
y_step,
x_end,
y_end;
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('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('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 canvas = document.createElement('canvas');
canvas.width = header.width;
canvas.height = header.height;
var context = canvas.getContext('2d');
var imageData = context.createImageData(header.width, header.height);
var result = tgaParse(use_rle, use_pal, header, offset, content);
getTgaRGBA(imageData.data, header.width, header.height, result.pixel_data, result.palettes);
context.putImageData(imageData, 0, 0);
return canvas;
}
});
export { TGALoader };