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/*
* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
*
* Copyright (C) 2013 Gordon Williams <[email protected]>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* ----------------------------------------------------------------------------
* This file is designed to be parsed during the build process
*
* JavaScript methods for ArrayBuffers
* ----------------------------------------------------------------------------
*/
#include "jswrap_arraybuffer.h"
#include "jsparse.h"
#include "jsinteractive.h"
/*JSON{ "type":"class",
"class" : "ArrayBuffer",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_ARRAYBUFFER",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for array buffers." ]
}*/
/*JSON{ "type":"class",
"class" : "ArrayBufferView",
"description" : ["This is the built-in JavaScript class that is the prototype for Uint8Array / Float32Array / etc" ]
}*/
/*JSON{ "type":"class",
"class" : "Uint8Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_UINT8",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"class",
"class" : "Int8Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_INT8",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"class",
"class" : "Uint16Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_UINT16",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"class",
"class" : "Int16Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_INT16",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"class",
"class" : "Uint32Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_UINT32",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"class",
"class" : "Int32Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_INT32",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"class",
"class" : "Float32Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_FLOAT32",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"class",
"class" : "Float64Array", "prototype" : "ArrayBufferView",
"check" : "jsvIsArrayBuffer(var) && var->varData.arraybuffer.type==ARRAYBUFFERVIEW_FLOAT64",
"not_real_object" : "Don't treat this as a real object - it's handled differently internally",
"description" : ["This is the built-in JavaScript class for a typed array.",
"Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays). " ]
}*/
/*JSON{ "type":"constructor", "class": "ArrayBuffer", "name": "ArrayBuffer",
"description" : "Create an Array Buffer object",
"generate" : "jswrap_arraybuffer_constructor",
"params" : [ [ "byteLength", "int", "The length in Bytes" ] ],
"return" : [ "JsVar", "An ArrayBuffer object" ]
}*/
JsVar *jswrap_arraybuffer_constructor(JsVarInt byteLength) {
if (byteLength <= 0 || byteLength>65535) {
jsError("Invalid length for ArrayBuffer\n");
return 0;
}
if (byteLength > JSV_ARRAYBUFFER_MAX_LENGTH) {
jsError("ArrayBuffer too long\n");
return 0;
}
JsVar *arrData = jsvNewStringOfLength((unsigned int)byteLength);
if (!arrData) return 0;
JsVar *arr = jsvNewWithFlags(JSV_ARRAYBUFFER);
if (!arr) {
jsvUnLock(arrData);
return 0;
}
arr->firstChild = jsvGetRef(jsvRef(arrData));
jsvUnLock(arrData);
arr->varData.arraybuffer.type = ARRAYBUFFERVIEW_ARRAYBUFFER;
arr->varData.arraybuffer.byteOffset = 0;
arr->varData.arraybuffer.length = (unsigned short)byteLength;
return arr;
}
/*
* Potential invocations:
* Uint8Array Uint8Array(unsigned long length);
* Uint8Array Uint8Array(TypedArray array);
* Uint8Array Uint8Array(sequence<type> array);
* Uint8Array Uint8Array(ArrayBuffer buffer, optional unsigned long byteOffset, optional unsigned long length);
*/
/*JSON{ "type":"constructor", "class": "Uint8Array", "name": "Uint8Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_UINT8, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
/*JSON{ "type":"constructor", "class": "Int8Array", "name": "Int8Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_INT8, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
/*JSON{ "type":"constructor", "class": "Uint16Array", "name": "Uint16Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_UINT16, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
/*JSON{ "type":"constructor", "class": "Int16Array", "name": "Int16Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_INT16, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
/*JSON{ "type":"constructor", "class": "Uint32Array", "name": "Uint32Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_UINT32, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
/*JSON{ "type":"constructor", "class": "Int32Array", "name": "Int32Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_INT32, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
/*JSON{ "type":"constructor", "class": "Float32Array", "name": "Float32Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_FLOAT32, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
/*JSON{ "type":"constructor", "class": "Float64Array", "name": "Float64Array",
"description" : "Create a typed array based on the given input. Either an existing Array Buffer, an Integer as a Length, or a simple array",
"generate_full" : "jswrap_typedarray_constructor(ARRAYBUFFERVIEW_FLOAT64, arr, jsvGetInteger(byteOffset), jsvGetInteger(length))",
"params" : [ [ "arr", "JsVar", "The array or typed array to base this off, or an integer which is the array length" ],
[ "byteOffset", "int", "The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)" ],
[ "length", "int", "The length (ONLY IF the first argument was an ArrayBuffer)" ] ],
"return" : [ "JsVar", "A typed array" ]
}*/
JsVar *jswrap_typedarray_constructor(JsVarDataArrayBufferViewType type, JsVar *arr, JsVarInt byteOffset, JsVarInt length) {
JsVar *arrayBuffer = 0;
if (jsvIsArrayBuffer(arr)) {
arrayBuffer = jsvLockAgain(arr);
} else if (jsvIsInt(arr)) {
length = jsvGetInteger(arr);
byteOffset = 0;
arrayBuffer = jswrap_arraybuffer_constructor(JSV_ARRAYBUFFER_GET_SIZE(type)*length);
} else if (jsvIsArray(arr)) {
length = jsvGetArrayLength(arr);
byteOffset = 0;
arrayBuffer = jswrap_arraybuffer_constructor(JSV_ARRAYBUFFER_GET_SIZE(type)*length);
// later on we'll populate this
}
if (!arrayBuffer) {
jsError("Unsupported first argument\n");
return 0;
}
if (length<=0) length = (JsVarInt)jsvGetArrayBufferLength(arrayBuffer) / JSV_ARRAYBUFFER_GET_SIZE(type);
JsVar *typedArr = jsvNewWithFlags(JSV_ARRAYBUFFER);
if (typedArr) {
typedArr->varData.arraybuffer.type = type;
typedArr->varData.arraybuffer.byteOffset = (unsigned short)byteOffset;
typedArr->varData.arraybuffer.length = (unsigned short)length;
typedArr->firstChild = jsvGetRef(jsvRef(arrayBuffer));
if (jsvIsArray(arr)) {
// if we were given an array, populate this ArrayBuffer
JsArrayIterator it;
jsvArrayIteratorNew(&it, arr);
while (jsvArrayIteratorHasElement(&it)) {
JsVar *idx = jsvArrayIteratorGetIndex(&it);
if (jsvIsInt(idx)) {
JsVar *val = jsvArrayIteratorGetElement(&it);
jsvArrayBufferSet(typedArr, jsvGetInteger(idx), val);
jsvUnLock(val);
}
jsvUnLock(idx);
jsvArrayIteratorNext(&it);
}
jsvArrayIteratorFree(&it);
}
}
jsvUnLock(arrayBuffer);
return typedArr;
}
/*JSON{ "type":"property", "class": "ArrayBufferView", "name": "buffer",
"description" : "The buffer this view references",
"generate_full" : "jsvLock(parent->firstChild)",
"return" : [ "JsVar", "An ArrayBuffer object" ]
}*/
/*JSON{ "type":"property", "class": "ArrayBufferView", "name": "byteLength",
"description" : "The length, in bytes, of the view",
"generate_full" : "parent->varData.arraybuffer.length * JSV_ARRAYBUFFER_GET_SIZE(parent->varData.arraybuffer.type)",
"return" : [ "int", "The Length" ]
}*/
/*JSON{ "type":"property", "class": "ArrayBufferView", "name": "byteOffset",
"description" : "The offset, in bytes, to the first byte of the view within the ArrayBuffer",
"generate_full" : "parent->varData.arraybuffer.byteOffset",
"return" : [ "int", "The byte Offset" ]
}*/
/*JSON{ "type":"method", "class": "ArrayBufferView", "name": "interpolate",
"description" : "Interpolate between two adjacent values in the Typed Array",
"generate" : "jswrap_arraybufferview_interpolate",
"params" : [ [ "index", "float", "Floating point index to access" ] ],
"return" : [ "float", "The result of interpolating between (int)index and (int)(index+1)" ]
}*/
JsVarFloat jswrap_arraybufferview_interpolate(JsVar *parent, JsVarFloat findex) {
int idx = (int)findex;
JsVarFloat a = findex-idx;
JsvArrayBufferIterator it;
jsvArrayBufferIteratorNew(&it, parent, idx);
JsVarFloat fa = jsvArrayBufferIteratorGetFloatValue(&it);
jsvArrayBufferIteratorNext(&it);
JsVarFloat fb = jsvArrayBufferIteratorGetFloatValue(&it);
jsvArrayBufferIteratorFree(&it);
return fa*(1-a) + fb*a;
}
/*JSON{ "type":"method", "class": "ArrayBufferView", "name": "interpolate2d",
"description" : "Interpolate between two adjacent values in the Typed Array",
"generate" : "jswrap_arraybufferview_interpolate2d",
"params" : [ [ "width", "int", "Integer 'width' of 2d array" ],
[ "x", "float", "Floating point X index to access" ],
[ "y", "float", "Floating point Y index to access" ] ],
"return" : [ "float", "The result of interpolating in 2d between the 4 surrounding cells" ]
}*/
JsVarFloat jswrap_arraybufferview_interpolate2d(JsVar *parent, JsVarInt width, JsVarFloat x, JsVarFloat y) {
int yidx = (int)y;
JsVarFloat ay = y-yidx;
JsVarFloat findex = x + (JsVarFloat)(yidx*width);
int idx = (int)findex;
JsVarFloat ax = findex-idx;
JsvArrayBufferIterator it;
jsvArrayBufferIteratorNew(&it, parent, idx);
JsVarFloat xa,xb;
int i;
xa = jsvArrayBufferIteratorGetFloatValue(&it);
jsvArrayBufferIteratorNext(&it);
xb = jsvArrayBufferIteratorGetFloatValue(&it);
JsVarFloat ya = xa*(1-ax) + xb*ax;
for (i=1;i<width;i++) jsvArrayBufferIteratorNext(&it);
xa = jsvArrayBufferIteratorGetFloatValue(&it);
jsvArrayBufferIteratorNext(&it);
xb = jsvArrayBufferIteratorGetFloatValue(&it);
jsvArrayBufferIteratorFree(&it);
JsVarFloat yb = xa*(1-ax) + xb*ax;
return ya*(1-ay) + yb*ay;
}
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