[adapters] 增加小游戏适配部分源码

adapters/platforms/bytedance/wrapper/engine/Label.js

@@ -0,0 +1,59 @@
+if (cc && cc.Label) {
+    const gfx = cc.gfx;
+    const Label = cc.Label;
+    const globalAdapter = __globalAdapter;
+    // shared label canvas
+    if (!globalAdapter.isSubContext) {
+        let _sharedLabelCanvas = document.createElement('canvas');
+        let _sharedLabelCanvasCtx = _sharedLabelCanvas.getContext('2d');
+        let canvasData = {
+            canvas: _sharedLabelCanvas,
+            context: _sharedLabelCanvasCtx,
+        };
+        cc.game.on(cc.game.EVENT_ENGINE_INITED, function () {
+            Object.assign(Label._canvasPool, {
+                get() {
+                    return canvasData;
+                },
+    
+                put() {
+                    // do nothing
+                }
+            });
+        });
+    }
+
+    // need to fix ttf font black border at the sdk verion lower than 2.0.0
+    let sysInfo = tt.getSystemInfoSync();
+    if (Number.parseInt(sysInfo.SDKVersion[0]) < 2) {
+        let _originUpdateMaterial = Label.prototype._updateMaterialWebgl;
+        Object.assign(Label.prototype, {
+            _updateMaterialWebgl () {
+                _originUpdateMaterial.call(this);
+                // only fix when srcBlendFactor is SRC_ALPHA
+                if (this.srcBlendFactor !== cc.macro.BlendFactor.SRC_ALPHA
+                    || globalAdapter.isDevTool || this.font instanceof cc.BitmapFont) {
+                    return;
+                }
+    
+                // init blend factor
+                let material = this._materials[0];
+                if (!this._frame || !material) {
+                    return;
+                }
+                let dstBlendFactor = this.dstBlendFactor;
+                // Premultiplied alpha on runtime when sdk verion is lower than 2.0.0
+                let srcBlendFactor = cc.macro.BlendFactor.ONE;
+    
+                // set blend func
+                material.effect.setBlend(
+                    true,
+                    gfx.BLEND_FUNC_ADD,
+                    srcBlendFactor, dstBlendFactor,
+                    gfx.BLEND_FUNC_ADD,
+                    srcBlendFactor, dstBlendFactor,
+                );
+            },
+        });
+    }
+}

adapters/platforms/bytedance/wrapper/engine/index.js

@@ -0,0 +1 @@
+require('./Label');