new feature: new costume from list of pixels

HISTORY.md

@@ -67,6 +67,7 @@
 * Blocks, Objects, Threads: new "getImageAttribute" reporter primitive
 * Objects, Threads: let "getImageAttribute" deal with null costumes
 * Objects, Threads: new "stretch" primitive for costumes, also for flipping
+* Threas: new feature: new costume from list of pixels
 
 ### 2019-04-08
 * Blocks, Objects, Threads: new "getSoundAttribute" reporter primitive

src/threads.js

@@ -60,7 +60,7 @@ degrees, detect, nop, radians, ReporterSlotMorph, CSlotMorph, RingMorph, Sound,
 IDE_Morph, ArgLabelMorph, localize, XML_Element, hex_sha512, TableDialogMorph,
 StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, Color,
-TableFrameMorph, ColorSlotMorph, isSnapObject, Map*/
+TableFrameMorph, ColorSlotMorph, isSnapObject, Map, newCanvas*/
 
 modules.threads = '2019-April-09';
 
@@ -4363,6 +4363,10 @@ Process.prototype.reportGetImageAttribute = function (choice, name) {
 };
 
 Process.prototype.reportNewCostumeStretched = function (name, xP, yP) {
+    if (name instanceof List) {
+        return this.reportNewCostume(name, xP, yP);
+    }
+
     var cst = name instanceof Costume ? name
             : (typeof name === 'number' ?
                     this.blockReceiver().costumes.at(name)
@@ -4380,6 +4384,27 @@ Process.prototype.reportNewCostumeStretched = function (name, xP, yP) {
     );
 };
 
+Process.prototype.reportNewCostume = function (pixels, width, height) {
+    // private
+    width = Math.abs(Math.floor(+width));
+    height = Math.abs(Math.floor(+height));
+
+    var canvas = newCanvas(new Point(width, height), true),
+        ctx = canvas.getContext('2d'),
+        src = pixels.asArray(),
+        dta = ctx.createImageData(width, height),
+        i, k, px;
+
+    for (i = 0; i < src.length; i += 1) {
+        px = src[i].asArray();
+        for (k = 0; k < 4; k += 1) {
+            dta.data[(i * 4) + k] = px[k];
+        }
+    }
+    ctx.putImageData(dta, 0, 0);
+    return new Costume(canvas);
+};
+
 // Process constant input options
 
 Process.prototype.inputOption = function (dta) {