Create ExportSpriteDataURI.js

files/ExportSpriteDataURI.js

@@ -0,0 +1,79 @@
+(function (Scratch) {
+    "use strict";
+
+    const vm = Scratch.vm;
+
+    class ExportSprite {
+      getInfo() {
+        return {
+          id: "exportSprite",
+          name: "Export Sprite",
+          blocks: [
+            {
+              opcode: "exportSprite",
+              blockType: Scratch.BlockType.REPORTER,
+              text: "Export Sprite As DataURI [TARGET]",
+              arguments: {
+                TARGET: {
+                  type: Scratch.ArgumentType.STRING,
+                  menu: "sprite",
+                }
+              }
+            }
+          ],
+          menus: {
+            sprite: {
+              acceptReporters: true,
+              items: "_getTargets",
+            },
+          },
+        };
+      }
+
+      exportSprite(args, util) {
+        return new Promise((resolve, reject) => {
+          let target = this._getTargetFromMenu(Scratch.Cast.toString(args.TARGET), util);
+          console.log(target);
+          Scratch.vm.exportSprite(target.id).then(val => {
+            this._blobToDataURL(val, (dataurl) => {
+              resolve(dataurl);
+            });
+          }).catch(reject);
+        });
+      }
+
+      _getTargetFromMenu(targetName, util) {
+        let target = Scratch.vm.runtime.getSpriteTargetByName(targetName);
+        if (targetName === "_myself_") target = util.target;
+        if (targetName === "_stage_") target = runtime.getTargetForStage();
+        return target;
+      }
+
+      _getTargets() {
+        const spriteNames = [
+          { text: "myself", value: "_myself_" },
+          { text: "Stage", value: "_stage_" },
+        ];
+        const targets = Scratch.vm.runtime.targets;
+        for (let index = 1; index < targets.length; index++) {
+          const target = targets[index];
+          if (target.isOriginal) {
+            const targetName = target.getName();
+            spriteNames.push({
+              text: targetName,
+              value: targetName,
+            });
+          }
+        }
+        return spriteNames;
+      }
+
+      _blobToDataURL(blob, callback) {
+        var a = new FileReader();
+        a.onload = function(e) {callback(e.target.result);}
+        a.readAsDataURL(blob);
+    }
+    }
+
+    Scratch.extensions.register(new ExportSprite());
+  })(Scratch);