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Docs: add example of how to get the right-side-up width/height (#3127)

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See #3124
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Rasmus Schultz 2022-03-09 16:59:09 +01:00 committed by GitHub
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1 changed files with 13 additions and 2 deletions
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15
lib/input.js
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@ -299,8 +299,8 @@ function _isStreamInput () {
* *
* - `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg` * - `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
* - `size`: Total size of image in bytes, for Stream and Buffer input only * - `size`: Total size of image in bytes, for Stream and Buffer input only
* - `width`: Number of pixels wide (EXIF orientation is not taken into consideration) * - `width`: Number of pixels wide (EXIF orientation is not taken into consideration, see example below)
* - `height`: Number of pixels high (EXIF orientation is not taken into consideration) * - `height`: Number of pixels high (EXIF orientation is not taken into consideration, see example below)
* - `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://libvips.github.io/libvips/API/current/VipsImage.html#VipsInterpretation) * - `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://libvips.github.io/libvips/API/current/VipsImage.html#VipsInterpretation)
* - `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK * - `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
* - `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...](https://libvips.github.io/libvips/API/current/VipsImage.html#VipsBandFormat) * - `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...](https://libvips.github.io/libvips/API/current/VipsImage.html#VipsBandFormat)
@ -343,6 +343,17 @@ function _isStreamInput () {
* // data contains a WebP image half the width and height of the original JPEG * // data contains a WebP image half the width and height of the original JPEG
* }); * });
* *
* @example
* // Based on EXIF rotation metadata, get the right-side-up width and height:
*
* const size = getNormalSize(await sharp(input).metadata());
*
* function getNormalSize({ width, height, orientation }) {
* return orientation || 0 >= 5
* ? { width: height, height: width }
* : { width, height };
* }
*
* @param {Function} [callback] - called with the arguments `(err, metadata)` * @param {Function} [callback] - called with the arguments `(err, metadata)`
* @returns {Promise<Object>|Sharp} * @returns {Promise<Object>|Sharp}
*/ */