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用了photoshop那么久，从来没仔细想过它到底用了哪些算法。想一想就觉得倒抽一口凉气。
传闻photoshop的创始人，和wps创始人一样，就一个程序员写好了这第一版的成品。同样是做人，咋就差距这么大呢？
千古疑问
所以这个.psd文件的格式是什么，它和png、jpg、gif，甚至json文件的格式上有什么区别？.psd文件是怎么做到分层的，分层的存储方式又是啥？如何把.psd文件的单层图另外存储起来成为多个sprite？(没错就是Unity中的sprite)以及如何对其进行轮廓检测呢？(unity是如何做到的呢？)
在危险的ps插件边缘试探
作为一个见得不够多脑子也不够灵活的菜鸡，我决定 “旁征博引” “凿壁偷光”，先康康有哪些源码可以让我学习学习~这要从psd文件导入unity的一个插件说起！
我们把一个很神秘的文件放进了photoshop的这个generator路径下，那么这个文件里面都有啥呢？   (JavaScript) main.jsx
(function() {
"use strict";
// *** PACKAGES ***
var fs = require("fs");
var path = require("path");
var pluginPackage = require("./package.json");
// *** CONSTANTS ***
var MENU_ID = pluginPackage.name; // our plugin's menu id
var MENU_STRING = "Ps2D Map"; // our plugin's menu text
var PLUGIN_VERSION = pluginPackage.version; // our plugin version
var PLUGIN_NAME = pluginPackage.name; // plugin name
var MAP_EXTENSION = ".ps2dmap.json"; // map's extension
// *** STATE VARIABLES ***
var _generator = null; // the generator framework
var _currentDocumentId = null; // the document's id
var _currentDocumentFile = null; // the document's filename
// *** PLUGIN FUNCTIONALITY
// kick it off!
function run() {
// request the document from photoshop
_generator.getDocumentInfo(_currentDocumentId)
.then(function(document) {
_currentDocumentFile = document.file;
var layoutDocument = createLayoutDocument(document);
saveMapFile(layoutDocument);
popup("The Ps2D map file has been created. Hurray!");
})
.done();
}
// Get the full filename for the layout file we create.
// It will be written in the same directory as the PSD file.
function layoutFilename() {
var myExtension = path.extname(_currentDocumentFile);
var myBasename = path.basename(_currentDocumentFile, myExtension);
var myPath = path.dirname(_currentDocumentFile);
return myPath + path.sep + myBasename + MAP_EXTENSION;
}
// save the layout to the file system
function saveMapFile(layoutDocument) {
// get the filename
var filename = layoutFilename();
// serialize our layoutDocument to a string
var contents = JSON.stringify(layoutDocument);
try
{
// a synchronous node.js call? finally, sanity!!! just kidding. mostly.
fs.writeFileSync(filename, contents);
} catch (err)
{
// TODO: It'd be nice to show people a message instead of just logging
log("unable to save map file to " + filename);
}
}
// convert the photoshop document to our own layout document
function createLayoutDocument(document) {
// create our own document
var layoutDocument = {};
layoutDocument.pluginVersion = PLUGIN_VERSION;
layoutDocument.bounds = document.bounds;
layoutDocument.mask = document.mask;
layoutDocument.sprites = convertLayersToSprites(document.layers);
return layoutDocument;
}
// convert a list of layers into a list of sprites
function convertLayersToSprites(layers) {
// sanity
if (layers === null || layers === undefined || layers.length === 0)
return null;
// sprites go here
var sprites = [];
// go through each layer
for (var i = 0, z = layers.length; i |