1 files changed, 51 insertions, 0 deletions
diff --git a/libs/hwui/shader/ComposeShader.cpp b/libs/hwui/shader/ComposeShader.cpp
new file mode 100644
index 000000000000..3765489e7431
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+++ b/libs/hwui/shader/ComposeShader.cpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ComposeShader.h"
+
+#include "SkImageFilters.h"
+#include "SkShader.h"
+
+namespace android::uirenderer {
+
+ComposeShader::ComposeShader(Shader& shaderA, Shader& shaderB, const SkBlendMode blendMode,
+                             const SkMatrix* matrix)
+        : Shader(matrix) {
+    // If both Shaders can be represented as SkShaders then use those, if not
+    // create an SkImageFilter from both Shaders and create the equivalent SkImageFilter
+    sk_sp<SkShader> skShaderA = shaderA.asSkShader();
+    sk_sp<SkShader> skShaderB = shaderB.asSkShader();
+    if (skShaderA.get() && skShaderB.get()) {
+        skShader = SkShaders::Blend(blendMode, skShaderA, skShaderB);
+        skImageFilter = nullptr;
+    } else {
+        sk_sp<SkImageFilter> skImageFilterA = shaderA.asSkImageFilter();
+        sk_sp<SkImageFilter> skImageFilterB = shaderB.asSkImageFilter();
+        skShader = nullptr;
+        skImageFilter = SkImageFilters::Xfermode(blendMode, skImageFilterA, skImageFilterB);
+    }
+}
+
+sk_sp<SkShader> ComposeShader::makeSkShader() {
+    return skShader;
+}
+
+sk_sp<SkImageFilter> ComposeShader::makeSkImageFilter() {
+    return skImageFilter;
+}
+
+ComposeShader::~ComposeShader() {}
+}  // namespace android::uirenderer