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Avoid (un)premultiplication for overlay image without alpha channel

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Add 'premultiplied' boolean attribute to output info, helps test
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Lovell Fuller
2017-03-25 16:52:09 +00:00
parent 301bfbd271
commit 1169afbe90
11 changed files with 109 additions and 104 deletions
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6
lib/output.js
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@@ -15,7 +15,8 @@ const sharp = require('../build/Release/sharp.node');
*
* @param {String} fileOut - the path to write the image data to.
* @param {Function} [callback] - called on completion with two arguments `(err, info)`.
* `info` contains the output image `format`, `size` (bytes), `width`, `height` and `channels`.
* `info` contains the output image `format`, `size` (bytes), `width`, `height`,
* `channels` and `premultiplied` (indicating if premultiplication was used).
* @returns {Promise<Object>} - when no callback is provided
* @throws {Error} Invalid parameters
*/
@@ -51,7 +52,8 @@ function toFile (fileOut, callback) {
* `callback`, if present, gets three arguments `(err, data, info)` where:
* - `err` is an error, if any.
* - `data` is the output image data.
* - `info` contains the output image `format`, `size` (bytes), `width`, `height` and `channels`.
* - `info` contains the output image `format`, `size` (bytes), `width`, `height`,
* `channels` and `premultiplied` (indicating if premultiplication was used).
* A Promise is returned when `callback` is not provided.
*
* @param {Object} [options]