Mon 21 Jul 22:43:21 CEST 2025

js/x11/examples/png/test1.js

@@ -0,0 +1,80 @@
+//var logo = require('./node-png').readPng('./node-logo.png');
+var fs = require('fs');
+var Decoder = require('./png-decoder');
+var decoder = new Decoder();
+
+var logo = {
+  data : Buffer.from(decoder.parse(fs.readFileSync('./screen.png'))),
+  width : decoder._IHDR.width,
+  height : decoder._IHDR.height
+};
+
+var x11 = require('../../lib');
+
+var Exposure = x11.eventMask.Exposure;
+
+x11.createClient(function(err, display)
+{
+  var X = display.client;
+  X.require('render', function(err, Render) {
+    var root = display.screen[0].root;
+    main(root, X, Render, display);
+  });
+});
+
+
+function main(root, X, Render, display) {
+
+  var win, picWin, pic, gc;
+
+  win = X.AllocID();
+  X.CreateWindow(
+     win, root,
+     0, 0, logo.width, logo.height,
+     0, 0, 0, 0,
+     { eventMask: Exposure }
+  );
+  X.MapWindow(win);
+
+  gc = X.AllocID();
+  X.CreateGC(gc, win);
+
+  var logoPixmap = X.AllocID();
+  X.CreatePixmap(logoPixmap, win, 24, logo.width, logo.height);
+
+  var rscreen = display.screen[0];
+  var screen =
+    rscreen.depths[rscreen.root_depth][
+      Object.keys(rscreen.depths[rscreen.root_depth])[0]];
+
+  var rmask = parseInt(screen.red_mask, 10);
+  var gmask = parseInt(screen.green_mask, 10);
+  var bmask = parseInt(screen.blue_mask, 10);
+
+  for (var y = 0; y < logo.height; y++) {
+    for (var x = 0; x < logo.width; x++) {
+      var pixel = Buffer.from([
+        logo.data[(x + logo.width * y) * 4],
+        logo.data[(x + logo.width * y) * 4 + 1],
+        logo.data[(x + logo.width * y) * 4 + 2], 0]).readInt32LE();
+
+      logo.data[(x + logo.width * y) * 4 ] = (pixel & rmask) >> 16;
+      logo.data[(x + logo.width * y) * 4 + 1] = (pixel & gmask) >> 8;
+      logo.data[(x + logo.width * y) * 4 + 2] = (pixel & bmask) >> 0;
+      logo.data[(x + logo.width * y) * 4 + 3] = 0x00;
+    }
+  }
+
+  X.PutImage(2, logoPixmap, gc, logo.width, logo.height, 0, 0, 0, 24, logo.data);
+
+  var logoPicture = X.AllocID();
+  Render.CreatePicture(logoPicture, logoPixmap, Render.rgb24);
+  var winPicture = X.AllocID();
+  Render.CreatePicture(winPicture, win, Render.rgb24);
+
+  X.on('event', function(ev) {
+    if (ev.name == 'Expose') {
+      Render.Composite(3, logoPicture, 0, winPicture, 0, 0, 0, 0, 0, 0, logo.width, logo.height);
+    }
+  });
+}