Revert "examples: revise example code."

This broke gl_engine rendering, revert it.

This reverts commit 9bb1972ef9.

src/examples/Arc.cpp

@@ -93,7 +93,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-    swCanvas->clear();  //Flush out cached resource
 }
 
 

src/examples/Blending.cpp

@@ -76,9 +76,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -112,9 +109,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Boundary.cpp

@@ -65,9 +65,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -101,9 +98,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/ClipPath.cpp

@@ -135,9 +135,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -171,9 +168,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Duplicate.cpp

@@ -117,9 +117,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -153,9 +150,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/FillRule.cpp

@@ -59,9 +59,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -95,9 +92,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/LinearGradient.cpp

@@ -94,9 +94,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -130,9 +127,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/MultiCanvas.cpp

@@ -79,9 +79,6 @@ void drawSwView(void* data, Eo* obj)
     if (canvas->draw() == tvg::Result::Success) {
         canvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    canvas->clear();
 }
 
 
@@ -163,9 +160,6 @@ void drawGLview(Evas_Object *obj)
     if (canvas->draw() == tvg::Result::Success) {
         canvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    canvas->clear();
 }
 
 

src/examples/MultiShapes.cpp

@@ -54,9 +54,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -90,9 +87,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Opacity.cpp

@@ -83,9 +83,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -119,9 +116,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Path.cpp

@@ -71,9 +71,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -107,9 +104,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/PathCopy.cpp

@@ -108,9 +108,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -144,9 +141,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/RadialGradient.cpp

@@ -94,9 +94,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -130,9 +127,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Scene.cpp

@@ -101,9 +101,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -137,9 +134,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Shape.cpp

@@ -44,9 +44,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -80,9 +77,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Stroke.cpp

@@ -102,8 +102,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -137,8 +135,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/StrokeLine.cpp

@@ -176,8 +176,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -211,8 +209,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 
@@ -241,6 +237,7 @@ int main(int argc, char **argv)
     //Initialize ThorVG Engine
     if (tvg::Initializer::init(tvgEngine, threads) == tvg::Result::Success) {
 
+
         elm_init(argc, argv);
 
         if (tvgEngine == tvg::CanvasEngine::Sw) {

src/examples/Svg.cpp

@@ -97,8 +97,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -132,8 +130,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Svg2.cpp

@@ -69,8 +69,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -104,8 +102,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 

src/examples/Update.cpp

@@ -19,6 +19,9 @@ void tvgUpdateCmds(tvg::Canvas* canvas, float progress)
 {
     if (!canvas) return;
 
+    //Explicitly clear all retained paint nodes.
+    if (canvas->clear() != tvg::Result::Success) return;
+
     //Shape
     auto shape = tvg::Shape::gen();
     shape->appendRect(-100, -100, 200, 200, (100 * progress), (100 * progress));
@@ -65,8 +68,6 @@ void drawSwView(void* data, Eo* obj)
     if (swCanvas->draw() == tvg::Result::Success) {
         swCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    swCanvas->clear();
 }
 
 
@@ -100,8 +101,6 @@ void drawGLview(Evas_Object *obj)
     if (glCanvas->draw() == tvg::Result::Success) {
         glCanvas->sync();
     }
-    //Explicitly clear all retained resources.
-    glCanvas->clear();
 }
 
 void transitGlCb(Elm_Transit_Effect *effect, Elm_Transit* transit, double progress)