arraybuffer

Do ArrayBuffers have a maximum length?

由 人走茶凉 提交于 2019-11-27 07:50:13
问题 I little confused here. Do ArrayBuffer allocate a new memory region for it? If so, what would be the safe maximum Blob size to put on it? 回答1: That only depends on your system and there doesn't seems to be a limit. According to the specification : If the requested number of bytes could not be allocated an exception is raised. 回答2: what would be the safe maximum Blob size to put on it There does not seem to be a hard limit, just whatever restrictions your platform imposes. However, if one uses

Scala 入门笔记1

由 点点圈 提交于 2019-11-27 07:02:15
方法定义： 1 def m1(x: Int, y: Int) : Int = { 2 x + y 3 } 函数定义： val f1 = (x: Int, y: Int) => x + y 　　 数组： 　　定长： val arr = new Array[Int](8)val arr = Array("111", "222", "333")println(arr(2)) 　　 　　变长： import scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer()val arr = ArrayBuffer[Int]()arr += 1arr ++= Array(2, 3) // 数组需要++=arr.insert(<位置>, <加入的内容>)arr.remove(<位置>, <元素个数>) 　　 来源： https://www.cnblogs.com/sunnystone85/p/11349648.html

Does interleaving in VBOs speed up performance when using VAOs

由 孤街醉人 提交于 2019-11-27 02:13:04
问题 You usually get a speed up when you use interleaved VBOs instead of using multiple VBOs. Is this also valid when using VAOs? Because it's much more convenient to have a VBO for the positions, and one for the normals etc. And you can use one VBO in multiple VAOs. 回答1: VAOs For sharing larger data sets, a dedicated buffer containing a single vertex (attrib) array is surely a way to go, while one could still interleave specific arrays in another buffer and combine them using a VAO. A VAO handles

How to get binary string from ArrayBuffer?

由 限于喜欢 提交于 2019-11-27 01:02:53
问题 What is the way to obtain binary string from ArrayBuffer in JavaScript? I don't want to encode the bytes, just get the binary representation as String. Thanks in advance! 回答1: The following code will consistently convert an ArrayBuffer to a String and back again without losing or adding any additional bytes. function ArrayBufferToString(buffer) { return BinaryToString(String.fromCharCode.apply(null, Array.prototype.slice.apply(new Uint8Array(buffer)))); } function StringToArrayBuffer(string)

How to go from Blob to ArrayBuffer

由 耗尽温柔 提交于 2019-11-26 21:19:35
I was studying Blobs, and I noticed that when you have an ArrayBuffer, you can easily convert this to a Blob as follows: var dataView = new DataView(arrayBuffer); var blob = new Blob([dataView], { type: mimeString }); The question I have now is, is it possible to go from a Blob to an ArrayBuffer? The new Response API is capable of decoding data from a (immutable) Blob . This is the Core API which the Fetch API uses. var blob = GetABlobSomehow(); var arrayBuffer = null; /* Use the await keyword to wait for the Promise to resolve */ arrayBuffer = await new Response(blob).arrayBuffer(); //:

Conversion between UTF-8 ArrayBuffer and String

由 旧街凉风 提交于 2019-11-26 20:19:26
I have an ArrayBuffer which contains a string encoded using UTF-8 and I can't find a standard way of converting such ArrayBuffer into a JS String (which I understand is encoded using UTF-16). I've seen this code in numerous places, but I fail to see how it would work with any UTF-8 code points that are longer than 1 byte. return String.fromCharCode.apply(null, new Uint8Array(data)); Similarly, I can't find a standard way of converting from a String to a UTF-8 encoded ArrayBuffer . function stringToUint(string) { var string = btoa(unescape(encodeURIComponent(string))), charList = string.split('

Convert base64 string to ArrayBuffer

由 无人久伴 提交于 2019-11-26 15:12:37
I need to convert a base64 encode string into an ArrayBuffer. The base64 strings are user input, they will be copy and pasted from an email, so they're not there when the page is loaded. I would like to do this in javascript without making an ajax call to the server if possible. I found those links interesting, but they didt'n help me: ArrayBuffer to base64 encoded string this is about the opposite conversion, from ArrayBuffer to base64, not the other way round http://jsperf.com/json-vs-base64/2 this looks good but i can't figure out how to use the code. Is there an easy (maybe native) way to

How to go from Blob to ArrayBuffer

由 二次信任 提交于 2019-11-26 06:57:50
问题 I was studying Blobs, and I noticed that when you have an ArrayBuffer, you can easily convert this to a Blob as follows: var dataView = new DataView(arrayBuffer); var blob = new Blob([dataView], { type: mimeString }); The question I have now is, is it possible to go from a Blob to an ArrayBuffer? 回答1: The Response API consumes a (immutable) Blob from which the data can be retrieved in several ways. The OP only asked for ArrayBuffer , and here's a demonstration of it. var blob =

Conversion between UTF-8 ArrayBuffer and String

由 送分小仙女□ 提交于 2019-11-26 06:36:57
问题 I have an ArrayBuffer which contains a string encoded using UTF-8 and I can\'t find a standard way of converting such ArrayBuffer into a JS String (which I understand is encoded using UTF-16). I\'ve seen this code in numerous places, but I fail to see how it would work with any UTF-8 code points that are longer than 1 byte. return String.fromCharCode.apply(null, new Uint8Array(data)); Similarly, I can\'t find a standard way of converting from a String to a UTF-8 encoded ArrayBuffer . 回答1:
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