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Add support for auto-scaling of width and height

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Lovell Fuller
2014-03-03 23:24:09 +00:00
parent 9b4387be97
commit f99e42d447
6 changed files with 71 additions and 15 deletions
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14
README.md
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@@ -31,7 +31,7 @@ Under the hood you'll find the blazingly fast [libvips](https://github.com/jcupi
git clone https://github.com/jcupitt/libvips.git
cd libvips
./bootstrap.sh
./configure --enable-debug=no --enable-cxx=no --without-magick --without-lcms --without-OpenEXR --without-openslide --without-matio --without-cfitsio --without-pangoft2 --without-zip --without-libexif --without-python
./configure --enable-debug=no
make
sudo make install
sudo ldconfig
@@ -52,9 +52,9 @@ Scale and crop to `width` x `height` calling `callback` when complete.
`output` can either be a filename String or one of `sharp.buffer.jpeg`, `sharp.buffer.png` or `sharp.buffer.webp` to pass a Buffer containing JPEG, PNG or WebP image data to `callback`.
`width` is the Number of pixels wide the resultant image should be.
`width` is the Number of pixels wide the resultant image should be. Use a value of -1 to auto-scale the width to match the height.
`height` is the Number of pixels high the resultant image should be.
`height` is the Number of pixels high the resultant image should be. Use a value of -1 to auto-scale the height to match the width.
`options` is optional, and can contain one or more of:
@@ -78,20 +78,20 @@ sharp.resize("input.jpg", "output.jpg", 300, 200, function(err) {
```
```javascript
sharp.resize("input.jpg", sharp.buffer.jpeg, 300, 200, {progressive: true}, function(err, buffer) {
sharp.resize("input.jpg", sharp.buffer.jpeg, -1, 200, {progressive: true}, function(err, buffer) {
if (err) {
throw err;
}
// buffer contains progressive JPEG image data
// buffer contains progressive JPEG image data, 200 pixels high
});
```
```javascript
sharp.resize("input.webp", sharp.buffer.png, 300, 200, {sharpen: true}, function(err, buffer) {
sharp.resize("input.webp", sharp.buffer.png, 300, -1, {sharpen: true}, function(err, buffer) {
if (err) {
throw err;
}
// buffer contains sharpened PNG image data (converted from JPEG)
// buffer contains sharpened PNG image data (converted from JPEG), 300 pixels wide
});
```