1 files changed, 64 insertions, 0 deletions
diff --git a/libs/hwui/pipeline/skia/StretchMask.cpp b/libs/hwui/pipeline/skia/StretchMask.cpp
new file mode 100644
index 000000000000..2bbd8a4fa028
--- /dev/null
+++ b/libs/hwui/pipeline/skia/StretchMask.cpp
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 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 "StretchMask.h"
+#include "SkSurface.h"
+#include "SkCanvas.h"
+#include "TransformCanvas.h"
+#include "SkiaDisplayList.h"
+
+using android::uirenderer::StretchMask;
+
+void StretchMask::draw(GrRecordingContext* context,
+                       const StretchEffect& stretch,
+                       const SkRect& bounds,
+                       skiapipeline::SkiaDisplayList* displayList,
+                       SkCanvas* canvas) {
+    float width = bounds.width();
+    float height = bounds.height();
+    if (mMaskSurface == nullptr || mMaskSurface->width() != width ||
+        mMaskSurface->height() != height) {
+        // Create a new surface if we don't have one or our existing size does
+        // not match.
+        mMaskSurface = SkSurface::MakeRenderTarget(
+            context,
+            SkBudgeted::kYes,
+            SkImageInfo::Make(
+                width,
+                height,
+                SkColorType::kAlpha_8_SkColorType,
+                SkAlphaType::kPremul_SkAlphaType)
+        );
+        mIsDirty = true;
+    }
+
+    if (mIsDirty) {
+        SkCanvas* maskCanvas = mMaskSurface->getCanvas();
+        maskCanvas->drawColor(0, SkBlendMode::kClear);
+        TransformCanvas transformCanvas(maskCanvas, SkBlendMode::kSrcOver);
+        displayList->draw(&transformCanvas);
+    }
+
+    sk_sp<SkImage> maskImage = mMaskSurface->makeImageSnapshot();
+    sk_sp<SkShader> maskStretchShader = stretch.getShader(
+        width, height, maskImage);
+
+    SkPaint maskPaint;
+    maskPaint.setShader(maskStretchShader);
+    maskPaint.setBlendMode(SkBlendMode::kDstOut);
+    canvas->drawRect(bounds, maskPaint);
+
+    mIsDirty = false;
+}
+\ No newline at end of file