Added BlurShader API
Created BlurShader framework API along with
native implementation as an implementation of
the Shader wrapper that maps to either
SkShader or SkImageFilter
Bug: 143468037
Test: Added CTS test to verify BlurShader
Change-Id: I05fcf7ba79e9d552f8b0738f7382f7826cd94e21
diff --git a/libs/hwui/shader/BlurShader.cpp b/libs/hwui/shader/BlurShader.cpp
new file mode 100644
index 0000000..4d18cdd
--- /dev/null
+++ b/libs/hwui/shader/BlurShader.cpp
@@ -0,0 +1,38 @@
+/*
+ * 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 "BlurShader.h"
+#include "SkImageFilters.h"
+#include "SkRefCnt.h"
+#include "utils/Blur.h"
+
+namespace android::uirenderer {
+BlurShader::BlurShader(float radiusX, float radiusY, Shader* inputShader, const SkMatrix* matrix)
+ : Shader(matrix)
+ , skImageFilter(
+ SkImageFilters::Blur(
+ Blur::convertRadiusToSigma(radiusX),
+ Blur::convertRadiusToSigma(radiusY),
+ inputShader ? inputShader->asSkImageFilter() : nullptr)
+ ) { }
+
+sk_sp<SkImageFilter> BlurShader::makeSkImageFilter() {
+ return skImageFilter;
+}
+
+BlurShader::~BlurShader() {}
+
+} // namespace android::uirenderer
\ No newline at end of file
diff --git a/libs/hwui/shader/BlurShader.h b/libs/hwui/shader/BlurShader.h
new file mode 100644
index 0000000..9eb22bd
--- /dev/null
+++ b/libs/hwui/shader/BlurShader.h
@@ -0,0 +1,42 @@
+/*
+ * 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.
+ */
+
+#pragma once
+#include "Shader.h"
+
+namespace android::uirenderer {
+
+/**
+ * Shader implementation that blurs another Shader instance or the source bitmap
+ */
+class BlurShader : public Shader {
+public:
+ /**
+ * Creates a BlurShader instance with the provided radius values to blur along the x and y
+ * axis accordingly.
+ *
+ * This will blur the contents of the provided input shader if it is non-null, otherwise
+ * the source bitmap will be blurred instead.
+ */
+ BlurShader(float radiusX, float radiusY, Shader* inputShader, const SkMatrix* matrix);
+ ~BlurShader() override;
+protected:
+ sk_sp<SkImageFilter> makeSkImageFilter() override;
+private:
+ sk_sp<SkImageFilter> skImageFilter;
+};
+
+} // namespace android::uirenderer
\ No newline at end of file
diff --git a/libs/hwui/shader/Shader.h b/libs/hwui/shader/Shader.h
index 3c0cdaa..6403e11 100644
--- a/libs/hwui/shader/Shader.h
+++ b/libs/hwui/shader/Shader.h
@@ -32,7 +32,9 @@
class Shader: public SkRefCnt {
public:
/**
- * Creates a Shader instance with an optional transformation matrix
+ * Creates a Shader instance with an optional transformation matrix. The transformation matrix
+ * is copied internally and ownership is unchanged. It is the responsibility of the caller to
+ * deallocate it appropriately.
* @param matrix Optional matrix to transform the underlying SkShader or SkImageFilter
*/
Shader(const SkMatrix* matrix);