1 files changed, 113 insertions, 0 deletions
diff --git a/services/surfaceflinger/LayerRenderArea.cpp b/services/surfaceflinger/LayerRenderArea.cpp
new file mode 100644
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+++ b/services/surfaceflinger/LayerRenderArea.cpp
@@ -0,0 +1,113 @@
+/*
+ * Copyright 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 <ui/GraphicTypes.h>
+#include <ui/Transform.h>
+
+#include "ContainerLayer.h"
+#include "DisplayDevice.h"
+#include "Layer.h"
+#include "LayerRenderArea.h"
+#include "SurfaceFlinger.h"
+
+namespace android {
+namespace {
+
+struct ReparentForDrawing {
+    const sp<Layer>& oldParent;
+
+    ReparentForDrawing(const sp<Layer>& oldParent, const sp<Layer>& newParent,
+                       const Rect& drawingBounds)
+          : oldParent(oldParent) {
+        // Compute and cache the bounds for the new parent layer.
+        newParent->computeBounds(drawingBounds.toFloatRect(), ui::Transform(),
+                                 0.f /* shadowRadius */);
+        oldParent->setChildrenDrawingParent(newParent);
+    }
+    ~ReparentForDrawing() { oldParent->setChildrenDrawingParent(oldParent); }
+};
+
+} // namespace
+
+LayerRenderArea::LayerRenderArea(SurfaceFlinger& flinger, sp<Layer> layer, const Rect& crop,
+                                 ui::Size reqSize, ui::Dataspace reqDataSpace, bool childrenOnly,
+                                 const Rect& layerStackRect, bool allowSecureLayers)
+      : RenderArea(reqSize, CaptureFill::CLEAR, reqDataSpace, layerStackRect, allowSecureLayers),
+        mLayer(std::move(layer)),
+        mCrop(crop),
+        mFlinger(flinger),
+        mChildrenOnly(childrenOnly) {}
+
+const ui::Transform& LayerRenderArea::getTransform() const {
+    return mTransform;
+}
+
+Rect LayerRenderArea::getBounds() const {
+    return mLayer->getBufferSize(mLayer->getDrawingState());
+}
+
+int LayerRenderArea::getHeight() const {
+    return mLayer->getBufferSize(mLayer->getDrawingState()).getHeight();
+}
+
+int LayerRenderArea::getWidth() const {
+    return mLayer->getBufferSize(mLayer->getDrawingState()).getWidth();
+}
+
+bool LayerRenderArea::isSecure() const {
+    return mAllowSecureLayers;
+}
+
+bool LayerRenderArea::needsFiltering() const {
+    return mNeedsFiltering;
+}
+
+sp<const DisplayDevice> LayerRenderArea::getDisplayDevice() const {
+    return nullptr;
+}
+
+Rect LayerRenderArea::getSourceCrop() const {
+    if (mCrop.isEmpty()) {
+        return getBounds();
+    } else {
+        return mCrop;
+    }
+}
+
+void LayerRenderArea::render(std::function<void()> drawLayers) {
+    using namespace std::string_literals;
+
+    const Rect sourceCrop = getSourceCrop();
+    // no need to check rotation because there is none
+    mNeedsFiltering = sourceCrop.width() != getReqWidth() || sourceCrop.height() != getReqHeight();
+
+    if (!mChildrenOnly) {
+        mTransform = mLayer->getTransform().inverse();
+        drawLayers();
+    } else {
+        uint32_t w = static_cast<uint32_t>(getWidth());
+        uint32_t h = static_cast<uint32_t>(getHeight());
+        // In the "childrenOnly" case we reparent the children to a screenshot
+        // layer which has no properties set and which does not draw.
+        sp<ContainerLayer> screenshotParentLayer = mFlinger.getFactory().createContainerLayer(
+                {&mFlinger, nullptr, "Screenshot Parent"s, w, h, 0, LayerMetadata()});
+
+        ReparentForDrawing reparent(mLayer, screenshotParentLayer, sourceCrop);
+        drawLayers();
+    }
+}
+
+} // namespace android