From 8d7ca27bb48b818a0bd4bb854b4d85656b90a480 Mon Sep 17 00:00:00 2001
From: unanmed <1319491857@qq.com>
Date: Fri, 4 Oct 2024 01:07:45 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=B8=B2=E6=9F=93=E6=A0=B9=E5=85=83?=
 =?UTF-8?q?=E7=B4=A0=E5=8F=96=E6=B6=88=E7=94=BB=E5=B8=83=E7=9A=84alpha?=
 =?UTF-8?q?=E9=80=9A=E9=81=93=EF=BC=8C=E6=8F=90=E9=AB=98=E6=80=A7=E8=83=BD?=
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---
 src/core/fx/canvas2d.ts   | 12 ++++++++----
 src/core/render/render.ts |  2 +-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/core/fx/canvas2d.ts b/src/core/fx/canvas2d.ts
index 3ec7d60..355d030 100644
--- a/src/core/fx/canvas2d.ts
+++ b/src/core/fx/canvas2d.ts
@@ -29,11 +29,11 @@ export class MotaOffscreenCanvas2D extends EventEmitter<OffscreenCanvasEvent> {
     /** 更新标识符，如果发生变化则说明画布被动清空 */
     symbol: number = 0;
 
-    constructor() {
+    constructor(alpha: boolean = true) {
         super();
 
         this.canvas = document.createElement('canvas');
-        this.ctx = this.canvas.getContext('2d')!;
+        this.ctx = this.canvas.getContext('2d', { alpha })!;
         this.width = this.canvas.width / devicePixelRatio;
         this.height = this.canvas.height / devicePixelRatio;
 
@@ -203,14 +203,18 @@ export class MotaCanvas2D extends MotaOffscreenCanvas2D {
     /** 是否是高清画布 */
     highResolution: boolean = true;
 
-    constructor(id: string = '', setTarget: boolean = true) {
+    constructor(
+        id: string = '',
+        setTarget: boolean = true,
+        alpha: boolean = true
+    ) {
         super();
 
         this.id = id;
         if (setTarget) this.target = core.dom.gameDraw;
         this.canvas = document.createElement('canvas');
         this.canvas.id = id;
-        this.ctx = this.canvas.getContext('2d')!;
+        this.ctx = this.canvas.getContext('2d', { alpha })!;
         this.width = this.canvas.width / devicePixelRatio;
         this.height = this.canvas.height / devicePixelRatio;
 
diff --git a/src/core/render/render.ts b/src/core/render/render.ts
index b6afca2..a1ab524 100644
--- a/src/core/render/render.ts
+++ b/src/core/render/render.ts
@@ -13,7 +13,7 @@ export class MotaRenderer extends Container {
     constructor(id: string = 'render-main') {
         super('static', false);
 
-        this.target = new MotaCanvas2D(id);
+        this.target = new MotaCanvas2D(id, true, false);
         this.size(core._PX_, core._PY_);
         this.target.withGameScale(true);
         this.target.size(core._PX_, core._PY_);