修正素材背景是白色时导致的亮度过高问题

BDAlphaPlayer.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |spec|
 
   spec.name         = "BDAlphaPlayer"
-  spec.version      = "1.2.2"
+  spec.version      = "1.2.3"
   spec.summary      = "A player for MP4 with alpha channel."
 
   spec.homepage     = "https://github.com/bytedance/AlphaPlayer/blob/master/README.md"

iOS/BDAlphaPlayer/Classes/Render/BDAlphaPlayerMetalRenderer.m

@@ -132,11 +132,11 @@ -(void)setupPipeline
     pipelineStateDescriptor.colorAttachments[0].pixelFormat = self.mtkView.colorPixelFormat;
     pipelineStateDescriptor.colorAttachments[0].blendingEnabled = true;
     pipelineStateDescriptor.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd;
-    pipelineStateDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorOne;
-    pipelineStateDescriptor.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOne;
-    pipelineStateDescriptor.colorAttachments[0].alphaBlendOperation = MTLBlendOperationMin;
-    pipelineStateDescriptor.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorOne;
-    pipelineStateDescriptor.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOne;
+    pipelineStateDescriptor.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd;
+    pipelineStateDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
+    pipelineStateDescriptor.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha;
+    pipelineStateDescriptor.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOneMinusBlendAlpha;
+    pipelineStateDescriptor.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorZero;
     self.pipelineState = [self.mtkView.device newRenderPipelineStateWithDescriptor:pipelineStateDescriptor error:NULL];
     self.commandQueue = [self.mtkView.device newCommandQueue];
 }

iOS/Example/BDAlphaPlayerDemo/BDAlphaPlayerDemo/Info.plist

@@ -20,25 +20,7 @@
 	<string>1</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
-	<key>UIApplicationSceneManifest</key>
-	<dict>
-		<key>UIApplicationSupportsMultipleScenes</key>
-		<false/>
-		<key>UISceneConfigurations</key>
-		<dict>
-			<key>UIWindowSceneSessionRoleApplication</key>
-			<array>
-				<dict>
-					<key>UISceneConfigurationName</key>
-					<string>Default Configuration</string>
-					<key>UISceneDelegateClassName</key>
-					<string>SceneDelegate</string>
-					<key>UISceneStoryboardFile</key>
-					<string>Main</string>
-				</dict>
-			</array>
-		</dict>
-	</dict>
+
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
 	<key>UILaunchStoryboardName</key>

iOS/Example/BDAlphaPlayerDemo/Podfile.lock

@@ -1,5 +1,5 @@
 PODS:
-  - BDAlphaPlayer (1.1.0)
+  - BDAlphaPlayer (1.2.3)
 
 DEPENDENCIES:
   - BDAlphaPlayer (from `../../../`)
@@ -9,8 +9,8 @@ EXTERNAL SOURCES:
     :path: "../../../"
 
 SPEC CHECKSUMS:
-  BDAlphaPlayer: 6ec0535dbbac6b089e94acb5559dcdf77dd1d5a8
+  BDAlphaPlayer: 750f1a2192f171ea8e710d969f993961d875c79d
 
 PODFILE CHECKSUM: a2a7c83a00e25dc193359c91e412457a63e7fbad
 
-COCOAPODS: 1.8.4
+COCOAPODS: 1.11.3