Bitmap/Read an image through a pipe: Difference between revisions
Bitmap/Read an image through a pipe (view source)
Revision as of 13:55, 18 October 2021
, 2 years agoAdded Wren
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}
}</lang>
=={{header|Wren}}==
{{libheader|DOME}}
As DOME doesn't have a method for calling an external process (''ImageMagick'' in this case), we re-use the small plug-in (''pipeconv.so'') we created in the 'PPM conversion through a pipe' task
to add this functionality.
We can now use this plug-in in the following script which calls ''ImageMagick'' to convert the ''output_piped.jpg'' file to a ''ppm'' file so that we can load the latter, convert it to a gray scale image, display it and save it to a .jpg file.
<lang ecmascript>import "graphics" for Canvas, ImageData, Color
import "dome" for Window, Process
import "io" for FileSystem
import "plugin" for Plugin
Plugin.load("pipeconv")
import "pipeconv" for PipeConv
class Bitmap {
construct new(fileName, fileName2, fileName3, width, height) {
Window.title = "Bitmap - read image via pipe"
Window.resize(width, height)
Canvas.resize(width, height)
_w = width
_h = height
_fn3 = fileName3
// convert .jpg file to .ppm via a pipe
PipeConv.convert(fileName, fileName2)
// load the .ppm file
loadPPMFile(fileName2)
}
init() {
toGrayScale()
// display gray scale image
_bmp2.draw(0, 0)
// save it to file
_bmp2.saveToFile(_fn3)
}
loadPPMFile(fileName) {
var ppm = FileSystem.load(fileName)
if (ppm[0..1] != "P6") {
System.print("The loaded file is not a P6 file.")
Process.exit()
}
var lines = ppm.split("\n")
if (Num.fromString(lines[2]) > 255) {
System.print("The maximum color value can't exceed 255.")
Process.exit()
}
var wh = lines[1].split(" ")
var w = Num.fromString(wh[0])
var h = Num.fromString(wh[1])
_bmp = ImageData.create(fileName, w, h)
var bytes = ppm.bytes
var i = bytes.count - 3 * w * h
for (y in 0...h) {
for (x in 0...w) {
var r = bytes[i]
var g = bytes[i+1]
var b = bytes[i+2]
var c = Color.rgb(r, g, b)
pset(x, y, c)
i = i + 3
}
}
}
toGrayScale() {
_bmp2 = ImageData.create("gray scale", _bmp.width, _bmp.height)
for (x in 0..._bmp.width) {
for (y in 0..._bmp.height) {
var c1 = _bmp.pget(x, y)
var lumin = (0.2126 * c1.r + 0.7152 * c1.g + 0.0722 * c1.b).floor
var c2 = Color.rgb(lumin, lumin,lumin, c1.a)
_bmp2.pset(x, y, c2)
}
}
}
pset(x, y, col) { _bmp.pset(x, y, col) }
pget(x, y) { _bmp.pget(x, y) }
update() {}
draw(alpha) {}
}
var Game = Bitmap.new("output_piped.jpg", "output_piped.ppm", "output_piped_gs.jpg", 350, 350)</lang>
=={{header|zkl}}==
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