56 lines
1.7 KiB
Kotlin
56 lines
1.7 KiB
Kotlin
// Version 1.2.40
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import java.awt.Color
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import java.awt.Graphics
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import java.awt.image.BufferedImage
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class BasicBitmapStorage(width: Int, height: Int) {
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val image = BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR)
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fun fill(c: Color) {
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val g = image.graphics
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g.color = c
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g.fillRect(0, 0, image.width, image.height)
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}
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fun setPixel(x: Int, y: Int, c: Color) = image.setRGB(x, y, c.getRGB())
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fun getPixel(x: Int, y: Int) = Color(image.getRGB(x, y))
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}
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fun main(args: Array<String>) {
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// create BasicBitmapStorage object
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val width = 640
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val height = 640
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val bbs = BasicBitmapStorage(width, height)
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for (y in 0 until height) {
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for (x in 0 until width) {
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val c = Color(x % 256, y % 256, (x * y) % 256)
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bbs.setPixel(x, y, c)
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}
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}
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// now write the object in PPM format to ImageMagick's STDIN via a pipe
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// so it can be converted to a .jpg file and written to disk
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val pb = ProcessBuilder("convert", "-", "output_piped.jpg")
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pb.directory(null)
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pb.redirectInput(ProcessBuilder.Redirect.PIPE)
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val buffer = ByteArray(width * 3) // write one line at a time
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val proc = pb.start()
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val pStdIn = proc.outputStream
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pStdIn.use {
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val header = "P6\n$width $height\n255\n".toByteArray()
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with (it) {
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write(header)
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for (y in 0 until height) {
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for (x in 0 until width) {
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val c = bbs.getPixel(x, y)
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buffer[x * 3] = c.red.toByte()
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buffer[x * 3 + 1] = c.green.toByte()
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buffer[x * 3 + 2] = c.blue.toByte()
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}
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write(buffer)
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}
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}
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}
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}
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