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import clone from "../Core/clone.js";
import ComponentDatatype from "../Core/ComponentDatatype.js";
import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import FeatureDetection from "../Core/FeatureDetection.js";
import getStringFromTypedArray from "../Core/getStringFromTypedArray.js";
import oneTimeWarning from "../Core/oneTimeWarning.js";
import MetadataComponentType from "./MetadataComponentType.js";
import MetadataClassProperty from "./MetadataClassProperty.js";
import MetadataType from "./MetadataType.js";
import addAllToArray from "../Core/addAllToArray.js";
/**
* A binary property in a {@MetadataTable}
* <p>
* For 3D Tiles Next details, see the {@link https://github.com/CesiumGS/3d-tiles/tree/main/extensions/3DTILES_metadata|3DTILES_metadata Extension}
* for 3D Tiles, as well as the {@link https://github.com/CesiumGS/glTF/tree/3d-tiles-next/extensions/2.0/Vendor/EXT_structural_metadata|EXT_structural_metadata Extension}
* for glTF. For the legacy glTF extension, see {@link https://github.com/CesiumGS/glTF/tree/3d-tiles-next/extensions/2.0/Vendor/EXT_feature_metadata|EXT_feature_metadata Extension}
* </p>
*
* @param {object} options Object with the following properties:
* @param {number} options.count The number of elements in each property array.
* @param {object} options.property The property JSON object.
* @param {MetadataClassProperty} options.classProperty The class property.
* @param {Object<string, Uint8Array>} options.bufferViews An object mapping bufferView IDs to Uint8Array objects.
*
* @alias MetadataTableProperty
* @constructor
*
* @private
* @experimental This feature is using part of the 3D Tiles spec that is not final and is subject to change without Cesium's standard deprecation policy.
*/
function MetadataTableProperty(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const count = options.count;
const property = options.property;
const classProperty = options.classProperty;
const bufferViews = options.bufferViews;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.number.greaterThan("options.count", count, 0);
Check.typeOf.object("options.property", property);
Check.typeOf.object("options.classProperty", classProperty);
Check.typeOf.object("options.bufferViews", bufferViews);
//>>includeEnd('debug');
const type = classProperty.type;
const isArray = classProperty.isArray;
const isVariableLengthArray = classProperty.isVariableLengthArray;
let valueType = classProperty.valueType;
const enumType = classProperty.enumType;
const hasStrings = type === MetadataType.STRING;
const hasBooleans = type === MetadataType.BOOLEAN;
let byteLength = 0;
let arrayOffsets;
if (isVariableLengthArray) {
// EXT_structural_metadata uses arrayOffsetType.
// EXT_feature_metadata uses offsetType for both arrays and strings
let arrayOffsetType = property.arrayOffsetType ?? property.offsetType;
arrayOffsetType =
MetadataComponentType[arrayOffsetType] ?? MetadataComponentType.UINT32;
// EXT_structural_metadata uses arrayOffsets.
// EXT_feature_metadata uses arrayOffsetBufferView
const arrayOffsetBufferView =
property.arrayOffsets ?? property.arrayOffsetBufferView;
arrayOffsets = new BufferView(
bufferViews[arrayOffsetBufferView],
arrayOffsetType,
count + 1,
);
byteLength += arrayOffsets.typedArray.byteLength;
}
const vectorComponentCount = MetadataType.getComponentCount(type);
let arrayComponentCount;
if (isVariableLengthArray) {
arrayComponentCount = arrayOffsets.get(count) - arrayOffsets.get(0);
} else if (isArray) {
arrayComponentCount = count * classProperty.arrayLength;
} else {
arrayComponentCount = count;
}
const componentCount = vectorComponentCount * arrayComponentCount;
let stringOffsets;
if (hasStrings) {
// EXT_structural_metadata uses stringOffsetType, EXT_feature_metadata uses offsetType for both arrays and strings
let stringOffsetType = property.stringOffsetType ?? property.offsetType;
stringOffsetType =
MetadataComponentType[stringOffsetType] ?? MetadataComponentType.UINT32;
// EXT_structural_metadata uses stringOffsets.
// EXT_feature_metadata uses stringOffsetBufferView
const stringOffsetBufferView =
property.stringOffsets ?? property.stringOffsetBufferView;
stringOffsets = new BufferView(
bufferViews[stringOffsetBufferView],
stringOffsetType,
componentCount + 1,
);
byteLength += stringOffsets.typedArray.byteLength;
}
if (hasStrings || hasBooleans) {
// STRING and BOOLEAN types need to be parsed differently than other types
valueType = MetadataComponentType.UINT8;
}
let valueCount;
if (hasStrings) {
valueCount = stringOffsets.get(componentCount) - stringOffsets.get(0);
} else if (hasBooleans) {
valueCount = Math.ceil(componentCount / 8);
} else {
valueCount = componentCount;
}
// EXT_structural_metadata uses values
// EXT_feature_metadata uses bufferView
const valuesBufferView = property.values ?? property.bufferView;
const values = new BufferView(
bufferViews[valuesBufferView],
valueType,
valueCount,
);
byteLength += values.typedArray.byteLength;
let offset = property.offset;
let scale = property.scale;
// This needs to be set before handling default values
const hasValueTransform =
classProperty.hasValueTransform || defined(offset) || defined(scale);
// If the table does not define an offset/scale, it inherits from the
// class property. The class property handles setting the default of identity:
// (offset 0, scale 1) with the same array shape as the property's type
// information.
offset = offset ?? classProperty.offset;
scale = scale ?? classProperty.scale;
// Since metadata table properties are stored as packed typed
// arrays, flatten the offset/scale to make it easier to apply the
// transformation by iteration.
offset = flatten(offset);
scale = flatten(scale);
let getValueFunction;
let setValueFunction;
const that = this;
if (hasStrings) {
getValueFunction = function (index) {
return getString(index, that._values, that._stringOffsets);
};
} else if (hasBooleans) {
getValueFunction = function (index) {
return getBoolean(index, that._values);
};
setValueFunction = function (index, value) {
setBoolean(index, that._values, value);
};
} else if (defined(enumType)) {
getValueFunction = function (index) {
const integer = that._values.get(index);
return enumType.namesByValue[integer];
};
setValueFunction = function (index, value) {
const integer = enumType.valuesByName[value];
that._values.set(index, integer);
};
} else {
getValueFunction = function (index) {
return that._values.get(index);
};
setValueFunction = function (index, value) {
that._values.set(index, value);
};
}
this._arrayOffsets = arrayOffsets;
this._stringOffsets = stringOffsets;
this._values = values;
this._classProperty = classProperty;
this._count = count;
this._vectorComponentCount = vectorComponentCount;
this._min = property.min;
this._max = property.max;
this._offset = offset;
this._scale = scale;
this._hasValueTransform = hasValueTransform;
this._getValue = getValueFunction;
this._setValue = setValueFunction;
this._unpackedValues = undefined;
this._extras = property.extras;
this._extensions = property.extensions;
this._byteLength = byteLength;
}
Object.defineProperties(MetadataTableProperty.prototype, {
/**
* True if offset/scale should be applied. If both offset/scale were
* undefined, they default to identity so this property is set false
*
* @memberof MetadataClassProperty.prototype
* @type {boolean}
* @readonly
* @private
*/
hasValueTransform: {
get: function () {
return this._hasValueTransform;
},
},
/**
* The offset to be added to property values as part of the value transform.
*
* @memberof MetadataClassProperty.prototype
* @type {number|number[]|number[][]}
* @readonly
* @private
*/
offset: {
get: function () {
return this._offset;
},
},
/**
* The scale to be multiplied to property values as part of the value transform.
*
* @memberof MetadataClassProperty.prototype
* @type {number|number[]|number[][]}
* @readonly
* @private
*/
scale: {
get: function () {
return this._scale;
},
},
/**
* Extra user-defined properties.
*
* @memberof MetadataTableProperty.prototype
* @type {*}
* @readonly
* @private
*/
extras: {
get: function () {
return this._extras;
},
},
/**
* An object containing extensions.
*
* @memberof MetadataTableProperty.prototype
* @type {*}
* @readonly
* @private
*/
extensions: {
get: function () {
return this._extensions;
},
},
/**
* Size of all typed arrays used by this table property
*
* @memberof MetadataTableProperty.prototype
* @type {Normal}
* @readonly
* @private
*/
byteLength: {
get: function () {
return this._byteLength;
},
},
});
/**
* Returns a copy of the value at the given index.
*
* @param {number} index The index.
* @returns {*} The value of the property.
*
* @private
*/
MetadataTableProperty.prototype.get = function (index) {
//>>includeStart('debug', pragmas.debug);
checkIndex(this, index);
//>>includeEnd('debug');
let value = get(this, index);
// handle noData and default
value = this._classProperty.handleNoData(value);
if (!defined(value)) {
value = this._classProperty.default;
return this._classProperty.unpackVectorAndMatrixTypes(value);
}
value = this._classProperty.normalize(value);
value = applyValueTransform(this, value);
return this._classProperty.unpackVectorAndMatrixTypes(value);
};
/**
* Sets the value at the given index.
*
* @param {number} index The index.
* @param {*} value The value of the property.
*
* @private
*/
MetadataTableProperty.prototype.set = function (index, value) {
const classProperty = this._classProperty;
//>>includeStart('debug', pragmas.debug);
Check.defined("value", value);
checkIndex(this, index);
const errorMessage = classProperty.validate(value);
if (defined(errorMessage)) {
throw new DeveloperError(errorMessage);
}
//>>includeEnd('debug');
value = classProperty.packVectorAndMatrixTypes(value);
value = unapplyValueTransform(this, value);
value = classProperty.unnormalize(value);
set(this, index, value);
};
/**
* Returns a typed array containing the property values.
*
* @returns {*} The typed array containing the property values or <code>undefined</code> if the property values are not stored in a typed array.
*
* @private
*/
MetadataTableProperty.prototype.getTypedArray = function () {
// Note: depending on the class definition some properties are unpacked to
// JS arrays when first accessed and values will be undefined. Generally not
// a concern for fixed-length arrays of numbers.
if (defined(this._values)) {
return this._values.typedArray;
}
return undefined;
};
function flatten(values) {
if (!Array.isArray(values)) {
return values;
}
const result = [];
for (let i = 0; i < values.length; i++) {
const value = values[i];
if (Array.isArray(value)) {
addAllToArray(result, value);
} else {
result.push(value);
}
}
return result;
}
function checkIndex(table, index) {
const count = table._count;
if (!defined(index) || index < 0 || index >= count) {
const maximumIndex = count - 1;
throw new DeveloperError(
`index is required and between zero and count - 1. Actual value: ${maximumIndex}`,
);
}
}
function get(property, index) {
if (requiresUnpackForGet(property)) {
unpackProperty(property);
}
const classProperty = property._classProperty;
const isArray = classProperty.isArray;
const type = classProperty.type;
const componentCount = MetadataType.getComponentCount(type);
if (defined(property._unpackedValues)) {
const value = property._unpackedValues[index];
if (isArray) {
return clone(value, true);
}
return value;
}
// handle single values
if (!isArray && componentCount === 1) {
return property._getValue(index);
}
return getArrayValues(property, classProperty, index);
}
function getArrayValues(property, classProperty, index) {
let offset;
let length;
if (classProperty.isVariableLengthArray) {
offset = property._arrayOffsets.get(index);
length = property._arrayOffsets.get(index + 1) - offset;
// for vectors and matrices, the offset and length need to be multiplied
// by the component count
const componentCount = MetadataType.getComponentCount(classProperty.type);
offset *= componentCount;
length *= componentCount;
} else {
const arrayLength = classProperty.arrayLength ?? 1;
const componentCount = arrayLength * property._vectorComponentCount;
offset = index * componentCount;
length = componentCount;
}
const values = new Array(length);
for (let i = 0; i < length; i++) {
values[i] = property._getValue(offset + i);
}
return values;
}
function set(property, index, value) {
if (requiresUnpackForSet(property, index, value)) {
unpackProperty(property);
}
const classProperty = property._classProperty;
const isArray = classProperty.isArray;
const type = classProperty.type;
const componentCount = MetadataType.getComponentCount(type);
if (defined(property._unpackedValues)) {
if (classProperty.isArray) {
value = clone(value, true);
}
property._unpackedValues[index] = value;
return;
}
// Values are unpacked if the length of a variable-size array changes or the
// property has strings. No need to handle these cases below.
// Handle single values
if (!isArray && componentCount === 1) {
property._setValue(index, value);
return;
}
let offset;
let length;
if (classProperty.isVariableLengthArray) {
offset = property._arrayOffsets.get(index);
length = property._arrayOffsets.get(index + 1) - offset;
} else {
const arrayLength = classProperty.arrayLength ?? 1;
const componentCount = arrayLength * property._vectorComponentCount;
offset = index * componentCount;
length = componentCount;
}
for (let i = 0; i < length; ++i) {
property._setValue(offset + i, value[i]);
}
}
function getString(index, values, stringOffsets) {
const stringByteOffset = stringOffsets.get(index);
const stringByteLength = stringOffsets.get(index + 1) - stringByteOffset;
return getStringFromTypedArray(
values.typedArray,
stringByteOffset,
stringByteLength,
);
}
function getBoolean(index, values) {
// byteIndex is floor(index / 8)
const byteIndex = index >> 3;
const bitIndex = index % 8;
return ((values.typedArray[byteIndex] >> bitIndex) & 1) === 1;
}
function setBoolean(index, values, value) {
// byteIndex is floor(index / 8)
const byteIndex = index >> 3;
const bitIndex = index % 8;
if (value) {
values.typedArray[byteIndex] |= 1 << bitIndex;
} else {
values.typedArray[byteIndex] &= ~(1 << bitIndex);
}
}
function getInt64NumberFallback(index, values) {
const dataView = values.dataView;
const byteOffset = index * 8;
let value = 0;
const isNegative = (dataView.getUint8(byteOffset + 7) & 0x80) > 0;
let carrying = true;
for (let i = 0; i < 8; ++i) {
let byte = dataView.getUint8(byteOffset + i);
if (isNegative) {
if (carrying) {
if (byte !== 0x00) {
byte = ~(byte - 1) & 0xff;
carrying = false;
}
} else {
byte = ~byte & 0xff;
}
}
value += byte * Math.pow(256, i);
}
if (isNegative) {
value = -value;
}
return value;
}
function getInt64BigIntFallback(index, values) {
const dataView = values.dataView;
const byteOffset = index * 8;
let value = BigInt(0);
const isNegative = (dataView.getUint8(byteOffset + 7) & 0x80) > 0;
let carrying = true;
for (let i = 0; i < 8; ++i) {
let byte = dataView.getUint8(byteOffset + i);
if (isNegative) {
if (carrying) {
if (byte !== 0x00) {
byte = ~(byte - 1) & 0xff;
carrying = false;
}
} else {
byte = ~byte & 0xff;
}
}
value += BigInt(byte) * (BigInt(1) << BigInt(i * 8));
}
if (isNegative) {
value = -value;
}
return value;
}
function getUint64NumberFallback(index, values) {
const dataView = values.dataView;
const byteOffset = index * 8;
// Split 64-bit number into two 32-bit (4-byte) parts
const left = dataView.getUint32(byteOffset, true);
const right = dataView.getUint32(byteOffset + 4, true);
// Combine the two 32-bit values
const value = left + 4294967296 * right;
return value;
}
function getUint64BigIntFallback(index, values) {
const dataView = values.dataView;
const byteOffset = index * 8;
// Split 64-bit number into two 32-bit (4-byte) parts
const left = BigInt(dataView.getUint32(byteOffset, true));
const right = BigInt(dataView.getUint32(byteOffset + 4, true));
// Combine the two 32-bit values
const value = left + BigInt(4294967296) * right;
return value;
}
function getComponentDatatype(componentType) {
switch (componentType) {
case MetadataComponentType.INT8:
return ComponentDatatype.BYTE;
case MetadataComponentType.UINT8:
return ComponentDatatype.UNSIGNED_BYTE;
case MetadataComponentType.INT16:
return ComponentDatatype.SHORT;
case MetadataComponentType.UINT16:
return ComponentDatatype.UNSIGNED_SHORT;
case MetadataComponentType.INT32:
return ComponentDatatype.INT;
case MetadataComponentType.UINT32:
return ComponentDatatype.UNSIGNED_INT;
case MetadataComponentType.FLOAT32:
return ComponentDatatype.FLOAT;
case MetadataComponentType.FLOAT64:
return ComponentDatatype.DOUBLE;
}
}
function requiresUnpackForGet(property) {
if (defined(property._unpackedValues)) {
return false;
}
const classProperty = property._classProperty;
const type = classProperty.type;
const valueType = classProperty.valueType;
if (type === MetadataType.STRING) {
// Unpack since UTF-8 decoding is expensive
return true;
}
if (
valueType === MetadataComponentType.INT64 &&
!FeatureDetection.supportsBigInt64Array()
) {
// Unpack since the fallback INT64 getters are expensive
return true;
}
if (
valueType === MetadataComponentType.UINT64 &&
!FeatureDetection.supportsBigUint64Array()
) {
// Unpack since the fallback UINT64 getters are expensive
return true;
}
return false;
}
function requiresUnpackForSet(property, index, value) {
if (requiresUnpackForGet(property)) {
return true;
}
const arrayOffsets = property._arrayOffsets;
if (defined(arrayOffsets)) {
// Unpacking is required if a variable-size array changes length since it
// would be expensive to repack the binary data
const oldLength = arrayOffsets.get(index + 1) - arrayOffsets.get(index);
const newLength = value.length;
if (oldLength !== newLength) {
return true;
}
}
return false;
}
function unpackProperty(property) {
property._unpackedValues = unpackValues(property);
// Free memory
property._arrayOffsets = undefined;
property._stringOffsets = undefined;
property._values = undefined;
}
function unpackValues(property) {
const count = property._count;
const unpackedValues = new Array(count);
const classProperty = property._classProperty;
const isArray = classProperty.isArray;
const type = classProperty.type;
const componentCount = MetadataType.getComponentCount(type);
// Handle single values
if (!isArray && componentCount === 1) {
for (let i = 0; i < count; ++i) {
unpackedValues[i] = property._getValue(i);
}
return unpackedValues;
}
for (let i = 0; i < count; i++) {
unpackedValues[i] = getArrayValues(property, classProperty, i);
}
return unpackedValues;
}
function applyValueTransform(property, value) {
const classProperty = property._classProperty;
const isVariableLengthArray = classProperty.isVariableLengthArray;
if (!property._hasValueTransform || isVariableLengthArray) {
return value;
}
return MetadataClassProperty.valueTransformInPlace(
value,
property._offset,
property._scale,
MetadataComponentType.applyValueTransform,
);
}
function unapplyValueTransform(property, value) {
const classProperty = property._classProperty;
const isVariableLengthArray = classProperty.isVariableLengthArray;
if (!property._hasValueTransform || isVariableLengthArray) {
return value;
}
return MetadataClassProperty.valueTransformInPlace(
value,
property._offset,
property._scale,
MetadataComponentType.unapplyValueTransform,
);
}
function BufferView(bufferView, componentType, length) {
const that = this;
let typedArray;
let getFunction;
let setFunction;
if (componentType === MetadataComponentType.INT64) {
if (!FeatureDetection.supportsBigInt()) {
oneTimeWarning(
"INT64 type is not fully supported on this platform. Values greater than 2^53 - 1 or less than -(2^53 - 1) may lose precision when read.",
);
typedArray = new Uint8Array(
bufferView.buffer,
bufferView.byteOffset,
length * 8,
);
getFunction = function (index) {
return getInt64NumberFallback(index, that);
};
} else if (!FeatureDetection.supportsBigInt64Array()) {
typedArray = new Uint8Array(
bufferView.buffer,
bufferView.byteOffset,
length * 8,
);
getFunction = function (index) {
return getInt64BigIntFallback(index, that);
};
} else {
typedArray = new BigInt64Array(
bufferView.buffer,
bufferView.byteOffset,
length,
);
setFunction = function (index, value) {
// Convert the number to a BigInt before setting the value in the typed array
that.typedArray[index] = BigInt(value);
};
}
} else if (componentType === MetadataComponentType.UINT64) {
if (!FeatureDetection.supportsBigInt()) {
oneTimeWarning(
"UINT64 type is not fully supported on this platform. Values greater than 2^53 - 1 may lose precision when read.",
);
typedArray = new Uint8Array(
bufferView.buffer,
bufferView.byteOffset,
length * 8,
);
getFunction = function (index) {
return getUint64NumberFallback(index, that);
};
} else if (!FeatureDetection.supportsBigUint64Array()) {
typedArray = new Uint8Array(
bufferView.buffer,
bufferView.byteOffset,
length * 8,
);
getFunction = function (index) {
return getUint64BigIntFallback(index, that);
};
} else {
typedArray = new BigUint64Array(
bufferView.buffer,
bufferView.byteOffset,
length,
);
setFunction = function (index, value) {
// Convert the number to a BigInt before setting the value in the typed array
that.typedArray[index] = BigInt(value);
};
}
} else {
const componentDatatype = getComponentDatatype(componentType);
typedArray = ComponentDatatype.createArrayBufferView(
componentDatatype,
bufferView.buffer,
bufferView.byteOffset,
length,
);
setFunction = function (index, value) {
that.typedArray[index] = value;
};
}
if (!defined(getFunction)) {
getFunction = function (index) {
return that.typedArray[index];
};
}
this.typedArray = typedArray;
this.dataView = new DataView(typedArray.buffer, typedArray.byteOffset);
this.get = getFunction;
this.set = setFunction;
// for unit testing
this._componentType = componentType;
}
export default MetadataTableProperty;
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