mirror of
https://github.com/tiennm99/fbird.git
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439 lines
13 KiB
JavaScript
Vendored
439 lines
13 KiB
JavaScript
Vendored
/****************************************************************************
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Copyright (c) 2008-2010 Ricardo Quesada
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Copyright (c) 2011-2012 cocos2d-x.org
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Copyright (c) 2013-2014 Chukong Technologies Inc.
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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/**
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* @constant
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* @type Number
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*/
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cc.TGA_OK = 0;
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/**
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* @constant
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* @type Number
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*/
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cc.TGA_ERROR_FILE_OPEN = 1;
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/**
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* @constant
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* @type Number
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*/
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cc.TGA_ERROR_READING_FILE = 2;
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/**
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* @constant
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* @type Number
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*/
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cc.TGA_ERROR_INDEXED_COLOR = 3;
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/**
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* @constant
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* @type Number
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*/
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cc.TGA_ERROR_MEMORY = 4;
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/**
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* @constant
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* @type Number
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*/
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cc.TGA_ERROR_COMPRESSED_FILE = 5;
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/**
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* TGA format
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* @param {Number} status
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* @param {Number} type
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* @param {Number} pixelDepth
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* @param {Number} width map width
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* @param {Number} height map height
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* @param {Array} imageData raw data
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* @param {Number} flipped
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* @constructor
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*/
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cc.ImageTGA = function (status, type, pixelDepth, width, height, imageData, flipped) {
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this.status = status || 0;
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this.type = type || 0;
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this.pixelDepth = pixelDepth || 0;
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this.width = width || 0;
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this.height = height || 0;
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this.imageData = imageData || [];
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this.flipped = flipped || 0;
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};
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/**
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* load the image header field from stream. We only keep those that matter!
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* @param {Array} buffer
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* @param {Number} bufSize
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* @param {cc.ImageTGA} psInfo
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* @return {Boolean}
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*/
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cc.tgaLoadHeader = function (buffer, bufSize, psInfo) {
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var step = 2;
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if (step + 1 > bufSize)
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return false;
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var binaryReader = new cc.BinaryStreamReader(buffer);
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binaryReader.setOffset(step);
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psInfo.type = binaryReader.readByte();
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step += 10; // . step += sizeof(unsigned char) * 2; step += sizeof(signed short) * 4;
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if (step + 4 + 1 > bufSize)
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return false;
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binaryReader.setOffset(step);
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psInfo.width = binaryReader.readUnsignedShort();
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psInfo.height = binaryReader.readUnsignedInteger();
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psInfo.pixelDepth = binaryReader.readByte();
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step += 5; // . step += sizeof(unsigned char); step += sizeof(signed short) * 2;
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if (step + 1 > bufSize)
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return false;
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var garbage = binaryReader.readByte();
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psInfo.flipped = 0;
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if (garbage & 0x20)
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psInfo.flipped = 1;
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return true;
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};
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/**
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* loads the image pixels. You shouldn't call this function directly.
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* @param {Array} buffer
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* @param {Number} bufSize
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* @param {cc.ImageTGA} psInfo
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* @return {Boolean}
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*/
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cc.tgaLoadImageData = function (buffer, bufSize, psInfo) {
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var mode, total, i, aux;
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var step = 18; // .size_t step = (sizeof(unsigned char) + sizeof(signed short)) * 6;
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// mode equal the number of components for each pixel
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mode = 0 | (psInfo.pixelDepth / 2);
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// total is the number of unsigned chars we'll have to read
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total = psInfo.height * psInfo.width * mode;
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if (step + total > bufSize)
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return false;
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psInfo.imageData = cc.__getSubArray(buffer, step, step + total);
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// mode=3 or 4 implies that the image is RGB(A). However TGA
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// stores it as BGR(A) so we'll have to swap R and B.
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if (mode >= 3) {
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for (i = 0; i < total; i += mode) {
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aux = psInfo.imageData[i];
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psInfo.imageData[i] = psInfo.imageData[i + 2];
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psInfo.imageData[i + 2] = aux;
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}
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}
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return true;
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};
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/**
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* converts RGB to grayscale
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* @param {cc.ImageTGA} psInfo
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*/
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cc.tgaRGBtogreyscale = function (psInfo) {
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var i, j;
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// if the image is already grayscale do nothing
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if (psInfo.pixelDepth === 8)
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return;
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// compute the number of actual components
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var mode = psInfo.pixelDepth / 8;
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// allocate an array for the new image data
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var newImageData = new Uint8Array(psInfo.height * psInfo.width);
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if (newImageData === null)
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return;
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// convert pixels: grayscale = o.30 * R + 0.59 * G + 0.11 * B
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for (i = 0, j = 0; j < psInfo.width * psInfo.height; i += mode, j++)
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newImageData[j] = (0.30 * psInfo.imageData[i] + 0.59 * psInfo.imageData[i + 1] + 0.11 * psInfo.imageData[i + 2]);
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// reassign pixelDepth and type according to the new image type
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psInfo.pixelDepth = 8;
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psInfo.type = 3;
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// reassigning imageData to the new array.
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psInfo.imageData = newImageData;
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};
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/**
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* releases the memory used for the image
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* @param {cc.ImageTGA} psInfo
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*/
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cc.tgaDestroy = function (psInfo) {
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if (!psInfo)
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return;
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psInfo.imageData = null;
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psInfo = null;
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};
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/**
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* Load RLE image data
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* @param buffer
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* @param bufSize
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* @param psInfo
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* @returns {boolean}
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*/
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cc.tgaLoadRLEImageData = function (buffer, bufSize, psInfo) {
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var mode, total, i, index = 0, skip = 0, flag = 0;
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var aux = [], runlength = 0;
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var step = 18; // . size_t step = (sizeof(unsigned char) + sizeof(signed short)) * 6;
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// mode equal the number of components for each pixel
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mode = psInfo.pixelDepth / 8;
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// total is the number of unsigned chars we'll have to read
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total = psInfo.height * psInfo.width;
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for (i = 0; i < total; i++) {
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// if we have a run length pending, run it
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if (runlength !== 0) {
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// we do, update the run length count
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runlength--;
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skip = (flag !== 0);
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} else {
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// otherwise, read in the run length token
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if (step + 1 > bufSize)
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break;
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runlength = buffer[step];
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step += 1;
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// see if it's a RLE encoded sequence
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flag = runlength & 0x80;
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if (flag)
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runlength -= 128;
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skip = 0;
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}
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// do we need to skip reading this pixel?
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if (!skip) {
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// no, read in the pixel data
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if (step + mode > bufSize)
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break;
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aux = cc.__getSubArray(buffer, step, step + mode);
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step += mode;
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// mode=3 or 4 implies that the image is RGB(A). However TGA
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// stores it as BGR(A) so we'll have to swap R and B.
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if (mode >= 3) {
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var tmp = aux[0];
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aux[0] = aux[2];
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aux[2] = tmp;
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}
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}
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// add the pixel to our image
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for (var j = 0; j < mode; j++)
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psInfo.imageData[index + j] = aux[j];
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index += mode;
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}
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return true;
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};
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/**
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* ImageTGA Flip
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* @param {cc.ImageTGA} psInfo
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*/
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cc.tgaFlipImage = function (psInfo) {
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// mode equal the number of components for each pixel
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var mode = psInfo.pixelDepth / 8;
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var rowbytes = psInfo.width * mode;
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for (var y = 0; y < (psInfo.height / 2); y++) {
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var row = cc.__getSubArray(psInfo.imageData, y * rowbytes, y * rowbytes + rowbytes);
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cc.__setDataToArray(cc.__getSubArray(psInfo.imageData, (psInfo.height - (y + 1)) * rowbytes, rowbytes), psInfo.imageData, y * rowbytes);
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cc.__setDataToArray(row, psInfo.imageData, (psInfo.height - (y + 1)) * rowbytes);
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}
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psInfo.flipped = 0;
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};
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cc.__getSubArray = function (array, start, end) {
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if (array instanceof Array)
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return array.slice(start, end);
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else
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return array.subarray(start, end);
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};
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cc.__setDataToArray = function (sourceData, destArray, startIndex) {
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for (var i = 0; i < sourceData.length; i++)
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destArray[startIndex + i] = sourceData[i];
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};
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/**
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* Binary Stream Reader
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*
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* @class
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* @param binaryData
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*/
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cc.BinaryStreamReader = cc.Class.extend({
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_binaryData: null,
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_offset: 0,
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/**
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* <p>The cc.BinaryStreamReader's constructor. <br/>
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* This function will automatically be invoked when you create a node using new construction: "var node = new cc.BinaryStreamReader()".<br/>
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* Override it to extend its behavior, remember to call "this._super()" in the extended "ctor" function.</p>
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* @param binaryData
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*/
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ctor: function (binaryData) {
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this._binaryData = binaryData;
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},
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/**
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* Set the binaryData.
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* @param binaryData
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*/
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setBinaryData: function (binaryData) {
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this._binaryData = binaryData;
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this._offset = 0;
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},
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/**
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* Gets the binaryData.
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* @returns {Object}
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*/
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getBinaryData: function () {
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return this._binaryData;
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},
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_checkSize: function (neededBits) {
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if (!(this._offset + Math.ceil(neededBits / 8) < this._data.length))
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throw new Error("Index out of bound");
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},
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_decodeFloat: function (precisionBits, exponentBits) {
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var length = precisionBits + exponentBits + 1;
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var size = length >> 3;
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this._checkSize(length);
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var bias = Math.pow(2, exponentBits - 1) - 1;
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var signal = this._readBits(precisionBits + exponentBits, 1, size);
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var exponent = this._readBits(precisionBits, exponentBits, size);
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var significand = 0;
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var divisor = 2;
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var curByte = 0; //length + (-precisionBits >> 3) - 1;
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do {
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var byteValue = this._readByte(++curByte, size);
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var startBit = precisionBits % 8 || 8;
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var mask = 1 << startBit;
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while (mask >>= 1) {
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if (byteValue & mask)
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significand += 1 / divisor;
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divisor *= 2;
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}
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} while (precisionBits -= startBit);
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this._offset += size;
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return exponent === (bias << 1) + 1 ? significand ? NaN : signal ? -Infinity : +Infinity
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: (1 + signal * -2) * (exponent || significand ? !exponent ? Math.pow(2, -bias + 1) * significand
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: Math.pow(2, exponent - bias) * (1 + significand) : 0);
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},
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_readByte: function (i, size) {
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return this._data[this._offset + size - i - 1];
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},
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_decodeInt: function (bits, signed) {
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var x = this._readBits(0, bits, bits / 8), max = Math.pow(2, bits);
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var result = signed && x >= max / 2 ? x - max : x;
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this._offset += bits / 8;
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return result;
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},
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_shl: function (a, b) {
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for (++b; --b; a = ((a %= 0x7fffffff + 1) & 0x40000000) === 0x40000000 ? a * 2 : (a - 0x40000000) * 2 + 0x7fffffff + 1) {
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}
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return a;
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},
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_readBits: function (start, length, size) {
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var offsetLeft = (start + length) % 8;
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var offsetRight = start % 8;
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var curByte = size - (start >> 3) - 1;
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var lastByte = size + (-(start + length) >> 3);
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var diff = curByte - lastByte;
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var sum = (this._readByte(curByte, size) >> offsetRight) & ((1 << (diff ? 8 - offsetRight : length)) - 1);
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if (diff && offsetLeft)
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sum += (this._readByte(lastByte++, size) & ((1 << offsetLeft) - 1)) << (diff-- << 3) - offsetRight;
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while (diff)
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sum += this._shl(this._readByte(lastByte++, size), (diff-- << 3) - offsetRight);
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return sum;
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},
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readInteger: function () {
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return this._decodeInt(32, true);
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},
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readUnsignedInteger: function () {
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return this._decodeInt(32, false);
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},
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readSingle: function () {
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return this._decodeFloat(23, 8);
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},
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readShort: function () {
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return this._decodeInt(16, true);
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},
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readUnsignedShort: function () {
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return this._decodeInt(16, false);
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},
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readByte: function () {
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var readByte = this._data[this._offset];
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this._offset += 1;
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return readByte;
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},
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readData: function (start, end) {
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if (this._binaryData instanceof Array) {
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return this._binaryData.slice(start, end);
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} else {
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//typed array
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return this._binaryData.subarray(start, end);
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}
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},
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setOffset: function (offset) {
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this._offset = offset;
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},
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getOffset: function () {
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return this._offset;
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}
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});
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