renderer: revise the internal paints structure.

Get rid of the polymorphism function table,
use the switch directly instead.

We profiled, both binary & performance is better than before.

Tested on a local machine (single thread):
- Lottie: 2ms improved
- Binary: -0.5kb

src/renderer/tvgPaint.cpp

@@ -22,11 +22,22 @@
 
 #include "tvgMath.h"
 #include "tvgPaint.h"
+#include "tvgShape.h"
+#include "tvgPicture.h"
+#include "tvgScene.h"
 
 /************************************************************************/
 /* Internal Class Implementation                                        */
 /************************************************************************/
 
+#define PAINT_METHOD(ret, METHOD) \
+    switch (id) { \
+        case TVG_CLASS_ID_SHAPE: ret = P((Shape*)paint)->METHOD; break; \
+        case TVG_CLASS_ID_SCENE: ret = P((Scene*)paint)->METHOD; break; \
+        case TVG_CLASS_ID_PICTURE: ret = P((Picture*)paint)->METHOD; break; \
+        default: ret = {}; \
+    }
+
 
 static bool _compFastTrack(Paint* cmpTarget, const RenderTransform* pTransform, RenderTransform* rTransform, RenderRegion& viewport)
 {
@@ -93,9 +104,36 @@ static bool _compFastTrack(Paint* cmpTarget, const RenderTransform* pTransform,
 }
 
 
+RenderRegion Paint::Impl::bounds(RenderMethod& renderer) const
+{
+    RenderRegion ret;
+    PAINT_METHOD(ret, bounds(renderer));
+    return ret;
+}
+
+
+bool Paint::Impl::dispose(RenderMethod& renderer)
+{
+    if (compData) compData->target->pImpl->dispose(renderer);
+
+    bool ret;
+    PAINT_METHOD(ret, dispose(renderer));
+    return ret;
+}
+
+
+Iterator* Paint::Impl::iterator()
+{
+    Iterator* ret;
+    PAINT_METHOD(ret, iterator());
+    return ret;
+}
+
+
 Paint* Paint::Impl::duplicate()
 {
-    auto ret = smethod->duplicate();
+    Paint* ret;
+    PAINT_METHOD(ret, duplicate());
 
     //duplicate Transform
     if (rTransform) {
@@ -165,8 +203,10 @@ bool Paint::Impl::render(RenderMethod& renderer)
     /* Note: only ClipPath is processed in update() step.
         Create a composition image. */
     if (compData && compData->method != CompositeMethod::ClipPath && !(compData->target->pImpl->ctxFlag & ContextFlag::FastTrack)) {
-        auto region = smethod->bounds(renderer);
-        if (MASK_REGION_MERGING(compData->method)) region.add(compData->target->pImpl->smethod->bounds(renderer));
+        RenderRegion region;
+        PAINT_METHOD(region, bounds(renderer));
+
+        if (MASK_REGION_MERGING(compData->method)) region.add(P(compData->target)->bounds(renderer));
         if (region.w == 0 || region.h == 0) return true;
         cmp = renderer.target(region, COMPOSITE_TO_COLORSPACE(renderer, compData->method));
         if (renderer.beginComposite(cmp, CompositeMethod::None, 255)) {
@@ -177,7 +217,9 @@ bool Paint::Impl::render(RenderMethod& renderer)
     if (cmp) renderer.beginComposite(cmp, compData->method, compData->target->pImpl->opacity);
 
     renderer.blend(blendMethod);
-    auto ret = smethod->render(renderer);
+
+    bool ret;
+    PAINT_METHOD(ret, render(renderer));
 
     if (cmp) renderer.endComposite(cmp);
 
@@ -189,10 +231,7 @@ RenderData Paint::Impl::update(RenderMethod& renderer, const RenderTransform* pT
 {
     if (renderFlag & RenderUpdateFlag::Transform) {
         if (!rTransform) return nullptr;
-        if (!rTransform->update()) {
-            delete(rTransform);
-            rTransform = nullptr;
-        }
+        rTransform->update();
     }
 
     /* 1. Composition Pre Processing */
@@ -239,18 +278,13 @@ RenderData Paint::Impl::update(RenderMethod& renderer, const RenderTransform* pT
     }
 
     /* 2. Main Update */
-    RenderData rd = nullptr;
     auto newFlag = static_cast<RenderUpdateFlag>(pFlag | renderFlag);
     renderFlag = RenderUpdateFlag::None;
     opacity = MULTIPLY(opacity, this->opacity);
 
-    if (rTransform && pTransform) {
-        RenderTransform outTransform(pTransform, rTransform);
-        rd = smethod->update(renderer, &outTransform, clips, opacity, newFlag, clipper);
-    } else {
-        auto outTransform = pTransform ? pTransform : rTransform;
-        rd = smethod->update(renderer, outTransform, clips, opacity, newFlag, clipper);
-    }
+    RenderData rd = nullptr;
+    RenderTransform outTransform(pTransform, rTransform);
+    PAINT_METHOD(rd, update(renderer, &outTransform, clips, opacity, newFlag, clipper));
 
     /* 3. Composition Post Processing */
     if (compFastTrack) renderer.viewport(viewport);
@@ -263,9 +297,13 @@ RenderData Paint::Impl::update(RenderMethod& renderer, const RenderTransform* pT
 bool Paint::Impl::bounds(float* x, float* y, float* w, float* h, bool transformed, bool stroking)
 {
     Matrix* m = nullptr;
+    bool ret;
 
     //Case: No transformed, quick return!
-    if (!transformed || !(m = this->transform())) return smethod->bounds(x, y, w, h, stroking);
+    if (!transformed || !(m = this->transform())) {
+        PAINT_METHOD(ret, bounds(x, y, w, h, stroking));
+        return ret;
+    }
 
     //Case: Transformed
     auto tx = 0.0f;
@@ -273,7 +311,7 @@ bool Paint::Impl::bounds(float* x, float* y, float* w, float* h, bool transforme
     auto tw = 0.0f;
     auto th = 0.0f;
 
-    auto ret = smethod->bounds(&tx, &ty, &tw, &th, stroking);
+    PAINT_METHOD(ret, bounds(&tx, &ty, &tw, &th, stroking));
 
     //Get vertices
     Point pt[4] = {{tx, ty}, {tx + tw, ty}, {tx + tw, ty + th}, {tx, ty + th}};
@@ -307,7 +345,7 @@ bool Paint::Impl::bounds(float* x, float* y, float* w, float* h, bool transforme
 /* External Class Implementation                                        */
 /************************************************************************/
 
-Paint :: Paint() : pImpl(new Impl())
+Paint :: Paint() : pImpl(new Impl(this))
 {
 }
 

src/renderer/tvgPaint.h

@@ -38,19 +38,6 @@ namespace tvg
         virtual void begin() = 0;
     };
 
-    struct StrategyMethod
-    {
-        virtual ~StrategyMethod() {}
-
-        virtual bool dispose(RenderMethod& renderer) = 0;     //return true if the deletion is allowed.
-        virtual void* update(RenderMethod& renderer, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag pFlag, bool clipper) = 0;   //Return engine data if it has.
-        virtual bool render(RenderMethod& renderer) = 0;
-        virtual bool bounds(float* x, float* y, float* w, float* h, bool stroking) = 0;
-        virtual RenderRegion bounds(RenderMethod& renderer) const = 0;
-        virtual Paint* duplicate() = 0;
-        virtual Iterator* iterator() = 0;
-    };
-
     struct Composite
     {
         Paint* target;
@@ -60,7 +47,7 @@ namespace tvg
 
     struct Paint::Impl
     {
-        StrategyMethod* smethod = nullptr;
+        Paint* paint = nullptr;
         RenderTransform* rTransform = nullptr;
         Composite* compData = nullptr;
         BlendMethod blendMethod = BlendMethod::Normal;              //uint8_t
@@ -70,13 +57,16 @@ namespace tvg
         uint8_t opacity = 255;
         uint8_t refCnt = 0;
 
+        Impl(Paint* paint) : paint(paint)
+        {
+        }
+
         ~Impl()
         {
             if (compData) {
                 if (P(compData->target)->unref() == 0) delete(compData->target);
                 free(compData);
             }
-            delete(smethod);
             delete(rTransform);
         }
 
@@ -92,11 +82,6 @@ namespace tvg
             return (--refCnt);
         }
 
-        void method(StrategyMethod* method)
-        {
-            smethod = method;
-        }
-
         bool transform(const Matrix& m)
         {
             if (!rTransform) {
@@ -119,22 +104,6 @@ namespace tvg
             return nullptr;
         }
 
-        RenderRegion bounds(RenderMethod& renderer) const
-        {
-            return smethod->bounds(renderer);
-        }
-
-        bool dispose(RenderMethod& renderer)
-        {
-            if (compData) compData->target->pImpl->dispose(renderer);
-            return smethod->dispose(renderer);
-        }
-
-        Iterator* iterator()
-        {
-            return smethod->iterator();
-        }
-
         bool composite(Paint* source, Paint* target, CompositeMethod method)
         {
             //Invalid case
@@ -162,6 +131,9 @@ namespace tvg
             return true;
         }
 
+        RenderRegion bounds(RenderMethod& renderer) const;
+        bool dispose(RenderMethod& renderer);
+        Iterator* iterator();
         bool rotate(float degree);
         bool scale(float factor);
         bool translate(float x, float y);
@@ -170,51 +142,6 @@ namespace tvg
         bool render(RenderMethod& renderer);
         Paint* duplicate();
     };
-
-
-    template<class T>
-    struct PaintMethod : StrategyMethod
-    {
-        T* inst = nullptr;
-
-        PaintMethod(T* _inst) : inst(_inst) {}
-        ~PaintMethod() {}
-
-        bool bounds(float* x, float* y, float* w, float* h, bool stroking) override
-        {
-            return inst->bounds(x, y, w, h, stroking);
-        }
-
-        RenderRegion bounds(RenderMethod& renderer) const override
-        {
-            return inst->bounds(renderer);
-        }
-
-        bool dispose(RenderMethod& renderer) override
-        {
-            return inst->dispose(renderer);
-        }
-
-        RenderData update(RenderMethod& renderer, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag renderFlag, bool clipper) override
-        {
-            return inst->update(renderer, transform, clips, opacity, renderFlag, clipper);
-        }
-
-        bool render(RenderMethod& renderer) override
-        {
-            return inst->render(renderer);
-        }
-
-        Paint* duplicate() override
-        {
-            return inst->duplicate();
-        }
-
-        Iterator* iterator() override
-        {
-            return inst->iterator();
-        }
-    };
 }
 
 #endif //_TVG_PAINT_H_

src/renderer/tvgPicture.cpp

@@ -62,7 +62,6 @@ RenderUpdateFlag Picture::Impl::load()
 Picture::Picture() : pImpl(new Impl(this))
 {
     Paint::pImpl->id = TVG_CLASS_ID_PICTURE;
-    Paint::pImpl->method(new PaintMethod<Picture::Impl>(pImpl));
 }
 
 

src/renderer/tvgRender.cpp

@@ -39,12 +39,9 @@ void RenderTransform::override(const Matrix& m)
 }
 
 
-bool RenderTransform::update()
+void RenderTransform::update()
 {
-    if (overriding) return true;
-
-    //Init Status
-    if (mathZero(x) && mathZero(y) && mathZero(degree) && mathEqual(scale, 1)) return false;
+    if (overriding) return;
 
     mathIdentity(&m);
 
@@ -53,17 +50,13 @@ bool RenderTransform::update()
     if (!mathZero(degree)) mathRotate(&m, degree);
 
     mathTranslate(&m, x, y);
-
-    return true;
-}
-
-
-RenderTransform::RenderTransform()
-{
 }
 
 
 RenderTransform::RenderTransform(const RenderTransform* lhs, const RenderTransform* rhs)
 {
-    m = mathMultiply(&lhs->m, &rhs->m);
+    if (lhs && rhs) m = mathMultiply(&lhs->m, &rhs->m);
+    else if (lhs) m = lhs->m;
+    else if (rhs) m = rhs->m;
+    else mathIdentity(&m);
 }

src/renderer/tvgRender.h

@@ -123,10 +123,10 @@ struct RenderTransform
     float scale = 1.0f;   //scale factor
     bool overriding = false;  //user transform?
 
-    bool update();
+    void update();
     void override(const Matrix& m);
 
-    RenderTransform();
+    RenderTransform() {}
     RenderTransform(const RenderTransform* lhs, const RenderTransform* rhs);
 };
 

src/renderer/tvgScene.cpp

@@ -29,7 +29,6 @@
 Scene::Scene() : pImpl(new Impl(this))
 {
     Paint::pImpl->id = TVG_CLASS_ID_SCENE;
-    Paint::pImpl->method(new PaintMethod<Scene::Impl>(pImpl));
 }
 
 

src/renderer/tvgScene.h

@@ -75,7 +75,7 @@ struct Scene::Impl
     ~Impl()
     {
         for (auto paint : paints) {
-            if (paint->pImpl->unref() == 0) delete(paint);
+            if (P(paint)->unref() == 0) delete(paint);
         }
     }
 

src/renderer/tvgShape.cpp

@@ -35,7 +35,6 @@ constexpr auto PATH_KAPPA = 0.552284f;
 Shape :: Shape() : pImpl(new Impl(this))
 {
     Paint::pImpl->id = TVG_CLASS_ID_SHAPE;
-    Paint::pImpl->method(new PaintMethod<Shape::Impl>(pImpl));
 }