Decouple SurfaceTexture from HWUI

Remove all Skia and HWUI types from SurfaceTexture
implementation.
Move SurfaceTexture to libgui (ag/9578265).
Define private C++ API for SurfaceTexture, which is consumed
by DeferredLayerUpdater.
Move AutoBackendTextureRelease/Skia code from SurfaceTexture
to HWUI.

Test: pass CtsUiRenderingTestCases and CtsViewTestCases
Bug: 136263580
Change-Id: I3f971bb490f64a3ac0b2a66a89ba935bf7f08213

1 files changed, 67 insertions, 0 deletions

diff --git a/libs/hwui/AutoBackendTextureRelease.h b/libs/hwui/AutoBackendTextureRelease.h
new file mode 100644
index 000000000000..acdd63cb7921
--- /dev/null
+++ b/libs/hwui/AutoBackendTextureRelease.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2019 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 <GrAHardwareBufferUtils.h>
+#include <GrBackendSurface.h>
+#include <SkImage.h>
+#include <android/hardware_buffer.h>
+#include <system/graphics.h>
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * AutoBackendTextureRelease manages EglImage/VkImage lifetime. It is a ref-counted object
+ * that keeps GPU resources alive until the last SkImage object using them is destroyed.
+ */
+class AutoBackendTextureRelease final {
+public:
+    AutoBackendTextureRelease(GrContext* context, AHardwareBuffer* buffer);
+
+    const GrBackendTexture& getTexture() const { return mBackendTexture; }
+
+    // Only called on the RenderThread, so it need not be thread-safe.
+    void ref() { mUsageCount++; }
+
+    void unref(bool releaseImage);
+
+    inline sk_sp<SkImage> getImage() const { return mImage; }
+
+    void makeImage(AHardwareBuffer* buffer, android_dataspace dataspace, GrContext* context);
+
+    void newBufferContent(GrContext* context);
+
+private:
+    // The only way to invoke dtor is with unref, when mUsageCount is 0.
+    ~AutoBackendTextureRelease() {}
+
+    GrBackendTexture mBackendTexture;
+    GrAHardwareBufferUtils::DeleteImageProc mDeleteProc;
+    GrAHardwareBufferUtils::UpdateImageProc mUpdateProc;
+    GrAHardwareBufferUtils::TexImageCtx mImageCtx;
+
+    // Starting with refcount 1, because the first ref is held by SurfaceTexture. Additional refs
+    // are held by SkImages.
+    int mUsageCount = 1;
+
+    // mImage is the SkImage created from mBackendTexture.
+    sk_sp<SkImage> mImage;
+};
+
+} /* namespace uirenderer */
+} /* namespace android */