June 2018 Update

Task/Bitmap-PPM-conversion-through-a-pipe/Julia/bitmap-ppm-conversion-through-a-pipe.julia

@@ -0,0 +1,4 @@
+using Images, FileIO
+
+ppmimg = load("data/bitmapInputTest.ppm")
+save("data/bitmapOutputTest.jpg", ppmimg)

Task/Bitmap-PPM-conversion-through-a-pipe/Kotlin/bitmap-ppm-conversion-through-a-pipe.kotlin

@@ -0,0 +1,56 @@
+// 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)
+            }
+        }
+    }
+}