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The method signature wasn't obvious enough so I came up with an example to show how it can be used.
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Gaurav Mali 2014-02-02 15:33:16 -05:00 committed by Luke Page
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@ -98,10 +98,23 @@ Returns `this` for method chaining.
### png.bitblt(dst, sx, sy, w, h, dx, dy)
Helper for image manipulation, copies rectangle of pixels from current image (`sx`, `sy`, `w`, `h`) to `dst` image (at `dx`, `dy`).
Helper for image manipulation, copies a rectangle of pixels from current (i.e. the source) image (`sx`, `sy`, `w`, `h`) to `dst` image (at `dx`, `dy`).
Returns `this` for method chaining.
For example, the following code copies the top-left 100x50 px of `in.png` into dst and writes it to `out.png`:
```js
var dst = new PNG({filterType: -1, width: 100, height: 50});
fs.createReadStream('in.png')
.pipe(new PNG({
filterType: -1
}))
.on('parsed', function() {
this.bitblt(dst, 0, 0, 100, 50, 0, 0);
dst.pack().pipe(fs.createWriteStream('out.png'));
});
```
### Property: width
Width of image in pixels