/
extend.ts
109 lines (94 loc) · 2.82 KB
/
extend.ts
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/*
* Copyright (c) 2016-present Invertase Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this library except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import * as superstruct from 'superstruct';
import * as utils from '../utils';
import { OperationBuilder } from '../types';
/**
* The user visible name of this operation.
*/
const name = 'extend';
/**
* Extends/pads the edges of the image with the provided background colour.
* This operation will always occur after resizing and extraction, if any.
*/
const struct = superstruct.object({
operation: superstruct.literal(name),
/**
* Pixel count to extend by from the top.
* Defaults to 0.
*/
all: superstruct.optional(
utils.coerceStringToInt(superstruct.min(superstruct.integer(), 0)),
),
/**
* Pixel count to extend by from the top.
* Defaults to 0.
*/
top: superstruct.optional(
utils.coerceStringToInt(superstruct.min(superstruct.integer(), 0)),
),
/**
* Pixel count to extend by from the left.
* Defaults to 0.
*/
left: superstruct.optional(
utils.coerceStringToInt(superstruct.min(superstruct.integer(), 0)),
),
/**
* Pixel count to extend by from the bottom.
* Defaults to 0.
*/
bottom: superstruct.optional(
utils.coerceStringToInt(superstruct.min(superstruct.integer(), 0)),
),
/**
* Pixel count to extend by from the right.
* Defaults to 0.
*/
right: superstruct.optional(
utils.coerceStringToInt(superstruct.min(superstruct.integer(), 0)),
),
/**
* Background color as a string to extend with.
* See the [color npm library](https://www.npmjs.com/package/color) for supported string formats.
* Defaults to black without transparency.
*/
background: superstruct.optional(superstruct.string()),
});
export type OperationExtend = superstruct.Infer<typeof struct>;
export const operationExtend: OperationBuilder = {
name,
struct,
/**
* Custom action builder to support `all` flag.
*/
build(operation) {
const optionsCopy = Object.assign({}, operation.options) as OperationExtend;
if (optionsCopy.all) {
optionsCopy.top = optionsCopy.all;
optionsCopy.left = optionsCopy.all;
optionsCopy.bottom = optionsCopy.all;
optionsCopy.right = optionsCopy.all;
delete optionsCopy.all;
}
return [
{
method: name,
arguments: [optionsCopy],
},
];
},
};