Adoption of RenderNode approach (#1014)

It is a simplified adoption of Android's `RenderNode`.

```kt
/**
 * <p>RenderNode is used to build hardware accelerated rendering hierarchies. Each RenderNode
 * contains both a display list as well as a set of properties that affect the rendering of the
 * display list. RenderNodes are used internally for all Views by default and are not typically
 * used directly.</p>
 *
 * <p>RenderNodes are used to divide up the rendering content of a complex scene into smaller
 * pieces that can then be updated individually more cheaply. Updating part of the scene only needs
 * to update the display list or properties of a small number of RenderNode instead of redrawing
 * everything from scratch. A RenderNode only needs its display list re-recorded when its content
 * alone should be changed. RenderNodes can also be transformed without re-recording the display
 * list through the transform properties.</p>
 ```
 
 This is a more correct approach to make `GraphicsLayer` in Compose invalidation independently.
 - Moved drawing callback to C++ side to avoid extra interop costs
 - Switched from `SkPicture` placeholder to custom `SkDrawable` implementation

NOTICE

@@ -0,0 +1,3 @@
+This project contains code adapted from "The Android Open Source Project" licensed under the Apache License, Version 2.0 (the "License"):
+
+https://android.googlesource.com/platform/frameworks/base

skiko/buildSrc/src/main/kotlin/CompileSkikoCppTask.kt

@@ -19,7 +19,7 @@ import kotlin.collections.HashSet
 
 abstract class CompileSkikoCppTask() : AbstractSkikoNativeToolTask() {
     @get:Internal
-    open val srcExtensions: Array<String> = arrayOf("cc")
+    open val srcExtensions: Array<String> = arrayOf("cc", "cpp")
 
     @get:Internal
     open val headerExtensions: Array<String> = arrayOf("h", "hh")

skiko/src/commonMain/cpp/common/include/mppinterop.h

@@ -6,6 +6,7 @@
 
 namespace skikoMpp {
     namespace skrect {
+        // TODO: Combine with skija::Rect::copyToInterop
         void serializeAs4Floats(const SkRect& rect, float* result);
         std::unique_ptr<SkRect> toSkRect(float* topLeftRightBottom);
     }

skiko/src/commonMain/cpp/common/include/node/Lighting.h

@@ -0,0 +1,20 @@
+#pragma once
+#include <SkPoint3.h>
+
+// Adoption of frameworks/base/libs/hwui/Lighting.h
+
+namespace skiko {
+namespace node {
+
+struct LightGeometry {
+    SkPoint3 center;
+    float radius;
+};
+
+struct LightInfo {
+    float ambientShadowAlpha;
+    float spotShadowAlpha;
+};
+
+} // namespace node
+} // namespace skiko

skiko/src/commonMain/cpp/common/include/node/RenderNode.h

@@ -0,0 +1,111 @@
+#pragma once
+#include <optional>
+#include <SkBBHFactory.h>
+#include <SkCamera.h>
+#include <SkCanvas.h>
+#include <SkColor.h>
+#include <SkDrawable.h>
+#include <SkMatrix.h>
+#include <SkPaint.h>
+#include <SkPath.h>
+#include <SkPictureRecorder.h>
+#include <SkPoint.h>
+#include <SkRRect.h>
+#include <SkRect.h>
+#include <SkRefCnt.h>
+#include "Lighting.h"
+
+namespace skiko {
+namespace node {
+
+class RenderNodeContext;
+
+class RenderNode : public SkDrawable {
+public:
+    RenderNode(const sk_sp<RenderNodeContext>& context);
+    ~RenderNode();
+
+    std::optional<SkPaint>& getLayerPaint() { return this->layerPaint; }
+    void setLayerPaint(const std::optional<SkPaint>& layerPaint);
+    const SkRect& getBounds() const { return this->bounds; }
+    void setBounds(const SkRect& bounds);
+    const SkPoint& getPivot() const { return this->pivot; }
+    void setPivot(const SkPoint& pivot);
+    float getAlpha() const { return this->alpha; }
+    void setAlpha(float alpha);
+    float getScaleX() const { return this->scaleX; }
+    void setScaleX(float scaleX);
+    float getScaleY() const { return this->scaleY; }
+    void setScaleY(float scaleY);
+    float getTranslationX() const { return this->translationX; }
+    void setTranslationX(float translationX);
+    float getTranslationY() const { return this->translationY; }
+    void setTranslationY(float translationY);
+    float getShadowElevation() const { return this->shadowElevation; }
+    void setShadowElevation(float shadowElevation);
+    SkColor getAmbientShadowColor() const { return this->ambientShadowColor; }
+    void setAmbientShadowColor(SkColor ambientShadowColor);
+    SkColor getSpotShadowColor() const { return this->spotShadowColor; }
+    void setSpotShadowColor(SkColor spotShadowColor);
+    float getRotationX() const { return this->rotationX; }
+    void setRotationX(float rotationX);
+    float getRotationY() const { return this->rotationY; }
+    void setRotationY(float rotationY);
+    float getRotationZ() const { return this->rotationZ; }
+    void setRotationZ(float rotationZ);
+    float getCameraDistance() const;
+    void setCameraDistance(float cameraDistance);
+    void setClipRect(const std::optional<SkRect>& clipRect);
+    void setClipRRect(const std::optional<SkRRect>& clipRRect);
+    void setClipPath(const std::optional<SkPath>& clipPath);
+    bool getClip() const { return this->clip; }
+    void setClip(bool clip);
+
+    const SkMatrix& getMatrix();
+
+    SkCanvas * beginRecording();
+    void endRecording();
+
+    void drawInto(SkCanvas *canvas);
+
+    // SkDrawable
+    void onDraw(SkCanvas* canvas) override;
+    SkRect onGetBounds() override;
+
+protected:
+    sk_sp<SkPicture> onMakePictureSnapshot() override;
+
+private:
+    void updateMatrix();
+    void drawShadow(SkCanvas *canvas, const LightGeometry& lightGeometry, const LightInfo& lightInfo);
+    void setCameraLocation(float x, float y, float z);
+
+    sk_sp<RenderNodeContext> context;
+
+    SkBBHFactory *bbhFactory;
+    SkPictureRecorder recorder;
+    sk_sp<SkDrawable> contentCache;
+
+    std::optional<SkPaint> layerPaint;
+    SkRect bounds;
+    SkPoint pivot;
+    float alpha;
+    float scaleX, scaleY;
+    float translationX, translationY;
+    float shadowElevation;
+    SkColor ambientShadowColor;
+    SkColor spotShadowColor;
+    float rotationX, rotationY, rotationZ;
+    std::optional<SkRect> clipRect;
+    std::optional<SkRRect> clipRRect;
+    std::optional<SkPath> clipPath;
+    bool clip;
+
+    SkMatrix transformMatrix;
+    SkCamera3D transformCamera;
+    bool matrixIdentity;
+    bool matrixDirty;
+};
+
+} // namespace node
+} // namespace skiko

skiko/src/commonMain/cpp/common/include/node/RenderNodeContext.h

@@ -0,0 +1,30 @@
+#pragma once
+#include <SkRefCnt.h>
+#include "Lighting.h"
+
+namespace skiko {
+namespace node {
+
+class RenderNode;
+
+class RenderNodeContext : public SkRefCnt {
+public:
+    RenderNodeContext(bool measureDrawBounds);
+
+    bool shouldMeasureDrawBounds() const { return this->measureDrawBounds; }
+
+    const LightGeometry& getLightGeometry() const { return this->lightGeometry; }
+    const LightInfo& getLightInfo() const { return this->lightInfo; }
+    void setLightingInfo(
+        const LightGeometry& lightGeometry,
+        const LightInfo& lightInfo
+    );
+
+private:
+    LightGeometry lightGeometry;
+    LightInfo lightInfo;
+    bool measureDrawBounds;
+};
+
+} // namespace node
+} // namespace skiko