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575 lines
17 KiB
JavaScript
575 lines
17 KiB
JavaScript
/**
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* @fileoverview jsTGALoader - Javascript loader for TGA file
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* @author Vincent Thibault
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* @version 1.2.0
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* @blog http://blog.robrowser.com/javascript-tga-loader.html
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*/
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/* Copyright (c) 2013, Vincent Thibault. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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(function(_global)
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{
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'use strict';
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/**
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* TGA Namespace
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* @constructor
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*/
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window.Targa = function()
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{
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}
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/**
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* @var {object} TGA type constants
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*/
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Targa.Type = {
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NO_DATA: 0,
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INDEXED: 1,
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RGB: 2,
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GREY: 3,
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RLE_INDEXED: 9,
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RLE_RGB: 10,
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RLE_GREY: 11
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};
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/**
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* @var {object} TGA origin constants
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*/
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Targa.Origin = {
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BOTTOM_LEFT: 0x00,
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BOTTOM_RIGHT: 0x01,
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TOP_LEFT: 0x02,
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TOP_RIGHT: 0x03,
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SHIFT: 0x04,
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MASK: 0x30
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};
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/**
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* Check the header of TGA file to detect errors
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*
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* @param {object} tga header structure
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* @throws Error
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*/
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function checkHeader( header )
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{
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// What the need of a file without data ?
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if (header.imageType === Targa.Type.NO_DATA) {
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throw new Error('Targa::checkHeader() - No data');
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}
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// Indexed type
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if (header.hasColorMap) {
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if (header.colorMapLength > 256 || header.colorMapDepth !== 24 || header.colorMapType !== 1) {
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throw new Error('Targa::checkHeader() - Invalid colormap for indexed type');
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}
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}
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else {
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if (header.colorMapType) {
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throw new Error('Targa::checkHeader() - Why does the image contain a palette ?');
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}
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}
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// Check image size
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if (header.width <= 0 || header.height <= 0) {
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throw new Error('Targa::checkHeader() - Invalid image size');
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}
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// Check pixel size
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if (header.pixelDepth !== 8 &&
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header.pixelDepth !== 16 &&
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header.pixelDepth !== 24 &&
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header.pixelDepth !== 32) {
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throw new Error('Targa::checkHeader() - Invalid pixel size "' + header.pixelDepth + '"');
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}
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}
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/**
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* Decode RLE compression
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*
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* @param {Uint8Array} data
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* @param {number} offset in data to start loading RLE
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* @param {number} pixel count
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* @param {number} output buffer size
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*/
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function decodeRLE( data, offset, pixelSize, outputSize)
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{
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var pos, c, count, i;
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var pixels, output;
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output = new Uint8Array(outputSize);
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pixels = new Uint8Array(pixelSize);
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pos = 0;
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while (pos < outputSize) {
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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 < pixelSize; ++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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output.set(pixels, pos);
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pos += pixelSize;
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}
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}
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// Raw pixels.
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else {
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count *= pixelSize;
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for (i = 0; i < count; ++i) {
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output[pos++] = data[offset++];
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}
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}
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}
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return output;
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}
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/**
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* Return a ImageData object from a TGA file (8bits)
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*
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* @param {Array} imageData - ImageData to bind
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* @param {Array} indexes - index to colormap
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* @param {Array} colormap
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* @param {number} width
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* @param {number} y_start - start at y pixel.
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* @param {number} x_start - start at x pixel.
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* @param {number} y_step - increment y pixel each time.
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* @param {number} y_end - stop at pixel y.
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* @param {number} x_step - increment x pixel each time.
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* @param {number} x_end - stop at pixel x.
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* @returns {Array} imageData
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*/
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function getImageData8bits(imageData, indexes, colormap, width, y_start, y_step, y_end, x_start, x_step, x_end)
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{
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var color, i, x, y;
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for (i = 0, 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 = indexes[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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/**
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* Return a ImageData object from a TGA file (16bits)
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*
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* @param {Array} imageData - ImageData to bind
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* @param {Array} pixels data
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* @param {Array} colormap - not used
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* @param {number} width
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* @param {number} y_start - start at y pixel.
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* @param {number} x_start - start at x pixel.
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* @param {number} y_step - increment y pixel each time.
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* @param {number} y_end - stop at pixel y.
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* @param {number} x_step - increment x pixel each time.
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* @param {number} x_end - stop at pixel x.
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* @returns {Array} imageData
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*/
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function getImageData16bits(imageData, pixels, colormap, width, y_start, y_step, y_end, x_start, x_step, x_end)
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{
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var color, i, x, y;
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for (i = 0, 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 = pixels[i + 0] | (pixels[i + 1] << 8);
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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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/**
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* Return a ImageData object from a TGA file (24bits)
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*
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* @param {Array} imageData - ImageData to bind
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* @param {Array} pixels data
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* @param {Array} colormap - not used
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* @param {number} width
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* @param {number} y_start - start at y pixel.
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* @param {number} x_start - start at x pixel.
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* @param {number} y_step - increment y pixel each time.
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* @param {number} y_end - stop at pixel y.
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* @param {number} x_step - increment x pixel each time.
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* @param {number} x_end - stop at pixel x.
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* @returns {Array} imageData
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*/
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function getImageData24bits(imageData, pixels, colormap, width, y_start, y_step, y_end, x_start, x_step, x_end)
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{
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var i, x, y;
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for (i = 0, 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] = pixels[i + 0];
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imageData[(x + width * y) * 4 + 1] = pixels[i + 1];
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imageData[(x + width * y) * 4 + 0] = pixels[i + 2];
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}
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}
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return imageData;
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}
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/**
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* Return a ImageData object from a TGA file (32bits)
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*
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* @param {Array} imageData - ImageData to bind
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* @param {Array} pixels data
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* @param {Array} colormap - not used
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* @param {number} width
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* @param {number} y_start - start at y pixel.
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* @param {number} x_start - start at x pixel.
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* @param {number} y_step - increment y pixel each time.
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* @param {number} y_end - stop at pixel y.
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* @param {number} x_step - increment x pixel each time.
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* @param {number} x_end - stop at pixel x.
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* @returns {Array} imageData
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*/
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function getImageData32bits(imageData, pixels, colormap, width, y_start, y_step, y_end, x_start, x_step, x_end)
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{
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var i, x, y;
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for (i = 0, 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] = pixels[i + 0];
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imageData[(x + width * y) * 4 + 1] = pixels[i + 1];
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imageData[(x + width * y) * 4 + 0] = pixels[i + 2];
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imageData[(x + width * y) * 4 + 3] = pixels[i + 3];
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}
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}
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return imageData;
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}
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/**
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* Return a ImageData object from a TGA file (8bits grey)
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*
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* @param {Array} imageData - ImageData to bind
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* @param {Array} pixels data
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* @param {Array} colormap - not used
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* @param {number} width
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* @param {number} y_start - start at y pixel.
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* @param {number} x_start - start at x pixel.
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* @param {number} y_step - increment y pixel each time.
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* @param {number} y_end - stop at pixel y.
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* @param {number} x_step - increment x pixel each time.
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* @param {number} x_end - stop at pixel x.
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* @returns {Array} imageData
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*/
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function getImageDataGrey8bits(imageData, pixels, colormap, width, y_start, y_step, y_end, x_start, x_step, x_end)
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{
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var color, i, x, y;
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for (i = 0, 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 = pixels[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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/**
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* Return a ImageData object from a TGA file (16bits grey)
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*
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* @param {Array} imageData - ImageData to bind
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* @param {Array} pixels data
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* @param {Array} colormap - not used
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* @param {number} width
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* @param {number} y_start - start at y pixel.
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* @param {number} x_start - start at x pixel.
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* @param {number} y_step - increment y pixel each time.
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* @param {number} y_end - stop at pixel y.
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* @param {number} x_step - increment x pixel each time.
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* @param {number} x_end - stop at pixel x.
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* @returns {Array} imageData
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*/
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function getImageDataGrey16bits(imageData, pixels, colormap, width, y_start, y_step, y_end, x_start, x_step, x_end)
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{
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var i, x, y;
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for (i = 0, 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] = pixels[i + 0];
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imageData[(x + width * y) * 4 + 1] = pixels[i + 0];
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imageData[(x + width * y) * 4 + 2] = pixels[i + 0];
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imageData[(x + width * y) * 4 + 3] = pixels[i + 1];
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}
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}
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return imageData;
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}
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/**
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* Open a targa file using XHR, be aware with Cross Domain files...
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*
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* @param {string} path - Path of the filename to load
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* @param {function} callback - callback to trigger when the file is loaded
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*/
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Targa.prototype.open = function targaOpen(path, callback)
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{
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var req, tga = this;
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req = new XMLHttpRequest();
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req.open('GET', path, true);
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req.responseType = 'arraybuffer';
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req.onload = function() {
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if (this.status === 200) {
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tga.load(new Uint8Array(req.response));
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if (callback) {
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callback.call(tga);
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}
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}
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};
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req.send(null);
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};
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/**
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* Load and parse a TGA file
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*
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* @param {Uint8Array} data - TGA file buffer array
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*/
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Targa.prototype.load = function targaLoad( data )
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{
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var offset = 0;
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// Not enough data to contain header ?
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if (data.length < 0x12) {
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throw new Error('Targa::load() - Not enough data to contain header');
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}
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// Read TgaHeader
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this.header = {
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/* 0x00 BYTE */ idLength: data[offset++],
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/* 0x01 BYTE */ colorMapType: data[offset++],
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/* 0x02 BYTE */ imageType: data[offset++],
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/* 0x03 WORD */ colorMapIndex: data[offset++] | data[offset++] << 8,
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/* 0x05 WORD */ colorMapLength: data[offset++] | data[offset++] << 8,
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/* 0x07 BYTE */ colorMapDepth: data[offset++],
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/* 0x08 WORD */ offsetX: data[offset++] | data[offset++] << 8,
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/* 0x0a WORD */ offsetY: data[offset++] | data[offset++] << 8,
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/* 0x0c WORD */ width: data[offset++] | data[offset++] << 8,
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/* 0x0e WORD */ height: data[offset++] | data[offset++] << 8,
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/* 0x10 BYTE */ pixelDepth: data[offset++],
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/* 0x11 BYTE */ flags: data[offset++]
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};
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// Set shortcut
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this.header.hasEncoding = (this.header.imageType === Targa.Type.RLE_INDEXED || this.header.imageType === Targa.Type.RLE_RGB || this.header.imageType === Targa.Type.RLE_GREY);
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this.header.hasColorMap = (this.header.imageType === Targa.Type.RLE_INDEXED || this.header.imageType === Targa.Type.INDEXED);
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this.header.isGreyColor = (this.header.imageType === Targa.Type.RLE_GREY || this.header.imageType === Targa.Type.GREY);
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// Check if a valid TGA file (or if we can load it)
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checkHeader(this.header);
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// Move to data
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offset += this.header.idLength;
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if (offset >= data.length) {
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throw new Error('Targa::load() - No data');
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}
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// Read palette
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if (this.header.hasColorMap) {
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var colorMapSize = this.header.colorMapLength * (this.header.colorMapDepth >> 3);
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this.palette = data.subarray( offset, offset + colorMapSize);
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offset += colorMapSize;
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}
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var pixelSize = this.header.pixelDepth >> 3;
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var imageSize = this.header.width * this.header.height;
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var pixelTotal = imageSize * pixelSize;
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// RLE encoded
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if (this.header.hasEncoding) {
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this.imageData = decodeRLE(data, offset, pixelSize, pixelTotal);
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}
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// RAW pixels
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else {
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this.imageData = data.subarray( offset, offset + (this.header.hasColorMap ? imageSize : pixelTotal) );
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}
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};
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/**
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* Return a ImageData object from a TGA file
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*
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* @param {object} imageData - Optional ImageData to work with
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* @returns {object} imageData
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*/
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Targa.prototype.getImageData = function targaGetImageData( imageData )
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{
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var width = this.header.width;
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var height = this.header.height;
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var origin = (this.header.flags & Targa.Origin.MASK) >> Targa.Origin.SHIFT;
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var x_start, x_step, x_end, y_start, y_step, y_end;
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var getImageData;
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// Create an imageData
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if (!imageData) {
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if (document) {
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imageData = document.createElement('canvas').getContext('2d').createImageData(width, height);
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}
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// In Thread context ?
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else {
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imageData = {
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width: width,
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height: height,
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data: new Uint8ClampedArray(width * height * 4)
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};
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}
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}
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if (origin === Targa.Origin.TOP_LEFT || origin === Targa.Origin.TOP_RIGHT) {
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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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}
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else {
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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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}
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if (origin === Targa.Origin.TOP_LEFT || origin === Targa.Origin.BOTTOM_LEFT) {
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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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}
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else {
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x_start = width - 1;
|
|
x_step = -1;
|
|
x_end = -1;
|
|
}
|
|
|
|
// TODO: use this.header.offsetX and this.header.offsetY ?
|
|
|
|
switch (this.header.pixelDepth) {
|
|
case 8:
|
|
getImageData = this.header.isGreyColor ? getImageDataGrey8bits : getImageData8bits;
|
|
break;
|
|
|
|
case 16:
|
|
getImageData = this.header.isGreyColor ? getImageDataGrey16bits : getImageData16bits;
|
|
break;
|
|
|
|
case 24:
|
|
getImageData = getImageData24bits;
|
|
break;
|
|
|
|
case 32:
|
|
getImageData = getImageData32bits;
|
|
break;
|
|
}
|
|
|
|
getImageData(imageData.data, this.imageData, this.palette, width, y_start, y_step, y_end, x_start, x_step, x_end);
|
|
return imageData;
|
|
};
|
|
|
|
|
|
/**
|
|
* Return a canvas with the TGA render on it
|
|
*
|
|
* @returns {object} CanvasElement
|
|
*/
|
|
Targa.prototype.getCanvas = function targaGetCanvas()
|
|
{
|
|
var canvas, ctx, imageData;
|
|
|
|
canvas = document.createElement('canvas');
|
|
ctx = canvas.getContext('2d');
|
|
imageData = ctx.createImageData(this.header.width, this.header.height);
|
|
|
|
canvas.width = this.header.width;
|
|
canvas.height = this.header.height;
|
|
|
|
ctx.putImageData(this.getImageData(imageData), 0, 0);
|
|
|
|
return canvas;
|
|
};
|
|
|
|
|
|
/**
|
|
* Return a dataURI of the TGA file
|
|
*
|
|
* @param {string} type - Optional image content-type to output (default: image/png)
|
|
* @returns {string} url
|
|
*/
|
|
Targa.prototype.getDataURL = function targaGetDatURL( type )
|
|
{
|
|
return this.getCanvas().toDataURL(type || 'image/png');
|
|
};
|
|
|
|
|
|
// Find Context
|
|
var shim = {};
|
|
if (typeof(exports) === 'undefined') {
|
|
if (typeof(define) === 'function' && typeof(define.amd) === 'object' && define.amd) {
|
|
define(function(){
|
|
return Targa;
|
|
});
|
|
} else {
|
|
// Browser
|
|
shim.exports = typeof(window) !== 'undefined' ? window : _global;
|
|
}
|
|
}
|
|
else {
|
|
// Commonjs
|
|
shim.exports = exports;
|
|
}
|
|
|
|
|
|
// Export
|
|
if (shim.exports) {
|
|
shim.exports.TGA = Targa;
|
|
}
|
|
|
|
})(this); |