Bitmap/PPM conversion through a pipe: Difference between revisions
Added Kotlin
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Line 116:
ppmimg = load("data/bitmapInputTest.ppm")
save("data/bitmapOutputTest.jpg", ppmimg)</lang>
=={{header|Kotlin}}==
{{works with|Ubuntu 16.04}}
In order to provide a complete runnable example, we repeat bits of code from other relevant tasks and add code which pipes .ppm data to ImageMagick's 'convert' tool which then writes the corresponding .jpg file to disk.
<lang scala>// Version 1.2.40
import java.awt.Color
import java.awt.Graphics
import java.awt.image.BufferedImage
class BasicBitmapStorage(width: Int, height: Int) {
val image = BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR)
fun fill(c: Color) {
val g = image.graphics
g.color = c
g.fillRect(0, 0, image.width, image.height)
}
fun setPixel(x: Int, y: Int, c: Color) = image.setRGB(x, y, c.getRGB())
fun getPixel(x: Int, y: Int) = Color(image.getRGB(x, y))
}
fun main(args: Array<String>) {
// create BasicBitmapStorage object
val width = 640
val height = 640
val bbs = BasicBitmapStorage(width, height)
for (y in 0 until height) {
for (x in 0 until width) {
val c = Color(x % 256, y % 256, (x * y) % 256)
bbs.setPixel(x, y, c)
}
}
// now write the object in PPM format to ImageMagick's STDIN via a pipe
// so it can be converted to a .jpg file and written to disk
val pb = ProcessBuilder("convert", "-", "output_piped.jpg")
pb.directory(null)
pb.redirectInput(ProcessBuilder.Redirect.PIPE)
val buffer = ByteArray(width * 3) // write one line at a time
val proc = pb.start()
val pStdIn = proc.outputStream
pStdIn.use {
val header = "P6\n$width $height\n255\n".toByteArray()
with (it) {
write(header)
for (y in 0 until height) {
for (x in 0 until width) {
val c = bbs.getPixel(x, y)
buffer[x * 3] = c.red.toByte()
buffer[x * 3 + 1] = c.green.toByte()
buffer[x * 3 + 2] = c.blue.toByte()
}
write(buffer)
}
}
}
}</lang>
=={{header|Mathematica}}==
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