diff --git a/src/renderer/wg_engine/tvgWgRenderer.cpp b/src/renderer/wg_engine/tvgWgRenderer.cpp
index 6de25995..255593cc 100755
--- a/src/renderer/wg_engine/tvgWgRenderer.cpp
+++ b/src/renderer/wg_engine/tvgWgRenderer.cpp
@@ -397,7 +397,7 @@ bool WgRenderer::beginComposite(RenderCompositor* cmp, MaskMethod method, uint8_
     mRenderStorageStack.push(storage);
     // begin newly added render pass
     WGPUColor color{};
-    if ((method == MaskMethod::None) && (opacity != 255)) color = { 1.0, 1.0, 1.0, 0.0 };
+    if ((compose->method == MaskMethod::None) && (compose->blend != BlendMethod::Normal)) color = { 1.0, 1.0, 1.0, 0.0 };
     mCompositor.beginRenderPass(mCommandEncoder, mRenderStorageStack.last(), true, color);
     return true;
 }
diff --git a/src/renderer/wg_engine/tvgWgShaderSrc.cpp b/src/renderer/wg_engine/tvgWgShaderSrc.cpp
index 7e838797..d4a763e2 100755
--- a/src/renderer/wg_engine/tvgWgShaderSrc.cpp
+++ b/src/renderer/wg_engine/tvgWgShaderSrc.cpp
@@ -237,7 +237,7 @@ fn vs_main(in: VertexInput) -> VertexOutput {
 @fragment
 fn fs_main(in: VertexOutput) -> @location(0) vec4f {
     let Sc = textureSample(uTextureSrc, uSamplerSrc, in.vTexCoord.xy);
-    return vec4f(Sc.rgb * Sc.a * So, Sc.a * So);
+    return vec4f(Sc.rgb * So, Sc.a * So);
 };
 )";