geotrellis.render.op.RenderPngRgba.scala Maven / Gradle / Ivy
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package geotrellis.render.op
import geotrellis._
import geotrellis.render.png._
/**
* Generate a PNG from a raster of RGBA integer values.
*
* Use this operation when you have created a raster whose values are already
* RGBA color values that you wish to render into a PNG. If you have a raster
* with data that you wish to render, you should use RenderPng instead.
*
* An RGBA value is a 32 bit integer with 8 bits used for each component:
* the first 8 bits are the red value (between 0 and 255), then green, blue,
* and alpha (with 0 being transparent and 255 being opaque).
*/
case class RenderPngRgba(r:Op[Raster]) extends Op1(r)({
r =>
val bytes = new Encoder(Settings(Rgba, PaethFilter)).writeByteArray(r)
Result(bytes)
})