Cocos Creator Image Location Resolution Algorithm

The parameters given in the Cocos Creator image location resolution algorithm and their descriptions are as follows:

Parameter	Description
`url`	The desired URL
`startDir`	The starting search directory
`DEPTH`	Search depth, fixed to 2
`SEARCH_DIR_NAMES`	Array of texture folder names, default is: `textures`, `materials`
`SEARCH_EXT_NAMES`	Array of extensions to search for, fixed to `.jpg`, `.jpeg`, `.png`, `.tga`, `.webp`

The Cocos Creator image location resolution algorithm is given by the following procedure:

If the file corresponding to url exists, return url.
Let expectedExtName be the extension of url.
let expectedBaseName be the extensionless filename of url.
Let searchExtNames be the array of [expectedExtName, ...SEARCH_EXT_NAMES] after de-duplication.
Let currentDir be startDir and loop for DEPTH times:
- If currentDir is outside the project's assets directory, then exit the loop.
- If none of the subdirectories in the currentDir directory have names matching SEARCH_DIR_NAMES, then the next loop is executed.
- Make dir a subdirectory of the currentDir directory with a name matching SEARCH_DIR_NAMES.
- Search dir for files with base names matching expectedBaseName and extensions matching searchExtNames, and if so, return their paths.
- Set currentDir to its parent directory.
Return search failure.

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