diff --git a/examples/Accessor.cpp b/examples/Accessor.cpp
index 5fb16e9f..1c6ecb1c 100644
--- a/examples/Accessor.cpp
+++ b/examples/Accessor.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //load the tvg file
         auto picture = tvg::Picture::gen();
         auto result = picture->load(EXAMPLE_DIR"/svg/favorite_on.svg");
diff --git a/examples/Animation.cpp b/examples/Animation.cpp
index 325f3497..24a1766c 100644
--- a/examples/Animation.cpp
+++ b/examples/Animation.cpp
@@ -72,8 +72,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         auto progress = tvgexam::progress(elapsed, animation->duration());
 
         //Update animation frame only when it's changed
diff --git a/examples/Blending.cpp b/examples/Blending.cpp
index ec10ab3e..4c18c76f 100644
--- a/examples/Blending.cpp
+++ b/examples/Blending.cpp
@@ -139,8 +139,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         if (!tvgexam::verify(tvg::Text::load(EXAMPLE_DIR"/font/Arial.ttf"))) return false;
 
         //Prepare Image
diff --git a/examples/BoundingBox.cpp b/examples/BoundingBox.cpp
index c109a27e..105a214e 100644
--- a/examples/BoundingBox.cpp
+++ b/examples/BoundingBox.cpp
@@ -69,8 +69,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         {
             auto shape = tvg::Shape::gen();
             shape->appendCircle(50, 100, 40, 100);
diff --git a/examples/Clipping.cpp b/examples/Clipping.cpp
index 73a72162..8a0f61f0 100644
--- a/examples/Clipping.cpp
+++ b/examples/Clipping.cpp
@@ -45,8 +45,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Background
         auto shape = tvg::Shape::gen();
         shape->appendRect(0, 0, w, h);
diff --git a/examples/CustomTransform.cpp b/examples/CustomTransform.cpp
index f8854415..81508ce5 100644
--- a/examples/CustomTransform.cpp
+++ b/examples/CustomTransform.cpp
@@ -35,8 +35,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         if (!tvgexam::verify(canvas->remove())) return false;
 
         auto progress = tvgexam::progress(elapsed, 2.0f, true);  //play time 2 sec.
diff --git a/examples/DataLoad.cpp b/examples/DataLoad.cpp
index ec9eac9d..b228f10d 100644
--- a/examples/DataLoad.cpp
+++ b/examples/DataLoad.cpp
@@ -32,8 +32,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Background
         auto shape = tvg::Shape::gen();
         shape->appendRect(0, 0, w, h);          //x, y, w, h
diff --git a/examples/DirectUpdate.cpp b/examples/DirectUpdate.cpp
index d2c68087..8d373202 100644
--- a/examples/DirectUpdate.cpp
+++ b/examples/DirectUpdate.cpp
@@ -35,8 +35,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Shape (for BG)
         auto bg = tvg::Shape::gen();
         bg->appendRect(0, 0, w, h);
@@ -85,8 +83,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         auto progress = tvgexam::progress(elapsed, 2.0f, true);  //play time 2 sec.
 
         //Reset Shape
diff --git a/examples/EffectDropShadow.cpp b/examples/EffectDropShadow.cpp
index 7dd14168..ede4c56a 100644
--- a/examples/EffectDropShadow.cpp
+++ b/examples/EffectDropShadow.cpp
@@ -34,8 +34,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //background
         auto bg = tvg::Shape::gen();
         bg->appendRect(0, 0, w, h);
@@ -94,8 +92,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         auto progress = tvgexam::progress(elapsed, 2.5f, true);   //2.5 seconds
 
         //Clear the previously applied effects
diff --git a/examples/FillRule.cpp b/examples/FillRule.cpp
index 63358d9e..4e507942 100644
--- a/examples/FillRule.cpp
+++ b/examples/FillRule.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Star
         auto shape1 = tvg::Shape::gen();
         shape1->moveTo(205, 35);
diff --git a/examples/FillSpread.cpp b/examples/FillSpread.cpp
index 94e8600c..f1de5eea 100644
--- a/examples/FillSpread.cpp
+++ b/examples/FillSpread.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         const int colorCnt = 4;
         tvg::Fill::ColorStop colorStops[colorCnt];
         colorStops[0] = {0.0f, 127, 39, 255, 255};
diff --git a/examples/GradientMasking.cpp b/examples/GradientMasking.cpp
index 83a59977..e58c6661 100644
--- a/examples/GradientMasking.cpp
+++ b/examples/GradientMasking.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Solid Rectangle
         {
             auto shape = tvg::Shape::gen();
diff --git a/examples/GradientStroke.cpp b/examples/GradientStroke.cpp
index 16d9ed3f..11f53c20 100644
--- a/examples/GradientStroke.cpp
+++ b/examples/GradientStroke.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         tvg::Fill::ColorStop colorStops1[3];
         colorStops1[0] = {0, 255, 0, 0, 150};
         colorStops1[1] = {0.5, 0, 0, 255, 150};
diff --git a/examples/GradientTransform.cpp b/examples/GradientTransform.cpp
index f4fab5a4..a441e4fd 100644
--- a/examples/GradientTransform.cpp
+++ b/examples/GradientTransform.cpp
@@ -35,8 +35,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         tvgexam::verify(canvas->remove());
 
         auto progress = tvgexam::progress(elapsed, 2.0f, true);  //play time 2 sec.
diff --git a/examples/ImageRotation.cpp b/examples/ImageRotation.cpp
index 161ff636..38b3cfe1 100644
--- a/examples/ImageRotation.cpp
+++ b/examples/ImageRotation.cpp
@@ -39,8 +39,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         picture = tvg::Picture::gen();
 
         if (!tvgexam::verify(picture->load(EXAMPLE_DIR"/image/scale.jpg"))) return false;
@@ -52,8 +50,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         tvg::Matrix m = {1.0f, 0.0f, 0.0f, 0.0f, 0.1f, 0.0f, 0.0f, 0.0f, 1.0f};
 
         //center pivoting
diff --git a/examples/ImageScaling.cpp b/examples/ImageScaling.cpp
index 05761c0c..ea35dd5b 100644
--- a/examples/ImageScaling.cpp
+++ b/examples/ImageScaling.cpp
@@ -32,8 +32,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Original
         picture = tvg::Picture::gen();
 
@@ -48,8 +46,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         auto progress = tvgexam::progress(elapsed, 3.0f, true);  //play time 3 secs.
 
         picture->scale((1.0f - progress) * 1.5f);
diff --git a/examples/LinearGradient.cpp b/examples/LinearGradient.cpp
index 55957dd2..3e4d17b5 100644
--- a/examples/LinearGradient.cpp
+++ b/examples/LinearGradient.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Prepare Round Rectangle
         auto shape1 = tvg::Shape::gen();
         shape1->appendRect(0, 0, 400, 400);    //x, y, w, h
diff --git a/examples/Lottie.cpp b/examples/Lottie.cpp
index 95848d20..7d02065b 100644
--- a/examples/Lottie.cpp
+++ b/examples/Lottie.cpp
@@ -77,8 +77,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         for (auto& animation : animations) {
             auto progress = tvgexam::progress(elapsed, animation->duration());
             animation->frame(animation->totalFrame() * progress);
@@ -91,8 +89,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //The default font for fallback in case
         tvg::Text::load(EXAMPLE_DIR"/font/Arial.ttf");
 
diff --git a/examples/LottieExpressions.cpp b/examples/LottieExpressions.cpp
index cc149863..f00f0ea7 100644
--- a/examples/LottieExpressions.cpp
+++ b/examples/LottieExpressions.cpp
@@ -77,8 +77,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         for (auto& animation : animations) {
             auto progress = tvgexam::progress(elapsed, animation->duration());
             animation->frame(animation->totalFrame() * progress);
@@ -91,8 +89,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //The default font for fallback in case
         tvg::Text::load(EXAMPLE_DIR"/font/Arial.ttf");
 
diff --git a/examples/LottieExtension.cpp b/examples/LottieExtension.cpp
index c5b582c0..e569aa8f 100644
--- a/examples/LottieExtension.cpp
+++ b/examples/LottieExtension.cpp
@@ -66,8 +66,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         //default slot
         {
             auto progress = tvgexam::progress(elapsed, slot0->duration());
@@ -147,8 +145,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Background
         auto bg = tvg::Shape::gen();
         bg->appendRect(0, 0, w, h);
diff --git a/examples/LottieInteraction.cpp b/examples/LottieInteraction.cpp
index 584a9e85..688f46f5 100644
--- a/examples/LottieInteraction.cpp
+++ b/examples/LottieInteraction.cpp
@@ -162,8 +162,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         //spinning effect
         if (effect.on) {
             auto elapsedTime = elapsed - effect.time;
diff --git a/examples/LottieTweening.cpp b/examples/LottieTweening.cpp
index c151ffcd..0bb2dbf4 100644
--- a/examples/LottieTweening.cpp
+++ b/examples/LottieTweening.cpp
@@ -200,8 +200,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         //on state tweening
         if (tween.active) return tweening(canvas);
 
diff --git a/examples/LumaMasking.cpp b/examples/LumaMasking.cpp
index 87120853..085fd655 100644
--- a/examples/LumaMasking.cpp
+++ b/examples/LumaMasking.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Image
         ifstream file(EXAMPLE_DIR"/image/rawimage_200x300.raw", ios::binary);
         if (!file.is_open()) return false;
diff --git a/examples/Masking.cpp b/examples/Masking.cpp
index a0a29aab..32c78aad 100644
--- a/examples/Masking.cpp
+++ b/examples/Masking.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Image
         ifstream file(EXAMPLE_DIR"/image/rawimage_200x300.raw", ios::binary);
         if (!file.is_open()) return false;
diff --git a/examples/MaskingMethods.cpp b/examples/MaskingMethods.cpp
index 00ce5f37..a702e974 100644
--- a/examples/MaskingMethods.cpp
+++ b/examples/MaskingMethods.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Image source
         ifstream file(EXAMPLE_DIR"/image/rawimage_200x300.raw", ios::binary);
         if (!file.is_open()) return false;
diff --git a/examples/Opacity.cpp b/examples/Opacity.cpp
index 2390e4e0..8c09d013 100644
--- a/examples/Opacity.cpp
+++ b/examples/Opacity.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Create a Scene
         auto scene = tvg::Scene::gen();
         scene->opacity(175);              //Apply opacity to scene (0 - 255)
diff --git a/examples/Particles.cpp b/examples/Particles.cpp
index 359f23af..aad2d621 100644
--- a/examples/Particles.cpp
+++ b/examples/Particles.cpp
@@ -43,8 +43,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         srand(100);
 
         auto city = tvg::Picture::gen();
@@ -100,7 +98,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
         for (auto& p : raindrops) {
             p.y += p.speed;
             if (p.y > h) {
diff --git a/examples/Path.cpp b/examples/Path.cpp
index 4cf8eda9..8ae33707 100644
--- a/examples/Path.cpp
+++ b/examples/Path.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Command Calls
         {
             //Star
diff --git a/examples/PictureJpg.cpp b/examples/PictureJpg.cpp
index 9b13a625..243e6874 100644
--- a/examples/PictureJpg.cpp
+++ b/examples/PictureJpg.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         auto opacity = 36;
 
         //Load jpg file from path
diff --git a/examples/PicturePng.cpp b/examples/PicturePng.cpp
index 661fb85d..5b651a84 100644
--- a/examples/PicturePng.cpp
+++ b/examples/PicturePng.cpp
@@ -30,12 +30,10 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Background
         auto bg = tvg::Shape::gen();
         bg->appendRect(0, 0, w, h);    //x, y, w, h
-        bg->fill(255, 255, 255);                //r, g, b
+        bg->fill(255, 255, 255);       //r, g, b
         canvas->push(bg);
 
         //Load png file from path
diff --git a/examples/PictureRaw.cpp b/examples/PictureRaw.cpp
index 27841db6..632e9200 100644
--- a/examples/PictureRaw.cpp
+++ b/examples/PictureRaw.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Background
         auto bg = tvg::Shape::gen();
         bg->appendRect(0, 0, w, h);
diff --git a/examples/PictureSvg.cpp b/examples/PictureSvg.cpp
index 3269bead..d7fca472 100644
--- a/examples/PictureSvg.cpp
+++ b/examples/PictureSvg.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //default font for fallback in case
         tvg::Text::load(EXAMPLE_DIR"/font/Arial.ttf");
 
diff --git a/examples/PictureWebp.cpp b/examples/PictureWebp.cpp
index b740ea51..06338d1d 100644
--- a/examples/PictureWebp.cpp
+++ b/examples/PictureWebp.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Background
         auto bg = tvg::Shape::gen();
         bg->appendRect(0, 0, w, h);             //x, y, w, h
diff --git a/examples/RadialGradient.cpp b/examples/RadialGradient.cpp
index f37f29fd..2b7b6cfc 100644
--- a/examples/RadialGradient.cpp
+++ b/examples/RadialGradient.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Prepare Round Rectangle
         auto shape1 = tvg::Shape::gen();
         shape1->appendRect(0, 0, 400, 400);    //x, y, w, h
diff --git a/examples/Retaining.cpp b/examples/Retaining.cpp
index 5ccd2eb8..28e91d70 100644
--- a/examples/Retaining.cpp
+++ b/examples/Retaining.cpp
@@ -74,8 +74,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         //update per every 250ms
         //reorder with a circular list
         if (elapsed - last > 250) {
diff --git a/examples/Scene.cpp b/examples/Scene.cpp
index 0765c1f5..26b15d72 100644
--- a/examples/Scene.cpp
+++ b/examples/Scene.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Create a Scene
         auto scene = tvg::Scene::gen();
 
diff --git a/examples/SceneBlending.cpp b/examples/SceneBlending.cpp
index 787f5e3e..cf945b29 100644
--- a/examples/SceneBlending.cpp
+++ b/examples/SceneBlending.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //BG
         auto bg = tvg::Shape::gen();
         bg->appendRect(0, 0, w, h);
diff --git a/examples/SceneEffects.cpp b/examples/SceneEffects.cpp
index 99825cd1..f009f65f 100644
--- a/examples/SceneEffects.cpp
+++ b/examples/SceneEffects.cpp
@@ -37,8 +37,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //blur scene
         for (int i = 0; i < 3; ++i) {
             blur[i] = tvg::Scene::gen();
@@ -97,8 +95,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         auto progress = tvgexam::progress(elapsed, 2.5f, true);   //2.5 seconds
 
         //Apply GaussianBlur post effect (sigma, direction, border option, quality)
diff --git a/examples/SceneTransform.cpp b/examples/SceneTransform.cpp
index 41659771..74f0fd2b 100644
--- a/examples/SceneTransform.cpp
+++ b/examples/SceneTransform.cpp
@@ -35,8 +35,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         if (!tvgexam::verify(canvas->remove())) return false;
 
         auto progress = tvgexam::progress(elapsed, 2.0f, true);  //play time 2 sec.
diff --git a/examples/Shapes.cpp b/examples/Shapes.cpp
index 65f093e2..1bc2130c 100644
--- a/examples/Shapes.cpp
+++ b/examples/Shapes.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Prepare a Composite Shape (Rectangle + Rectangle + Circle + Circle)
         auto shape4 = tvg::Shape::gen();
         shape4->appendRect(0, 0, 300, 300, 50, 50);     //x, y, w, h, rx, ry
diff --git a/examples/Stroke.cpp b/examples/Stroke.cpp
index 8854dbf7..2176ba67 100644
--- a/examples/Stroke.cpp
+++ b/examples/Stroke.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Shape 1
         auto shape1 = tvg::Shape::gen();
         shape1->appendRect(50, 50, 200, 200);
diff --git a/examples/StrokeLine.cpp b/examples/StrokeLine.cpp
index d553c922..bd2c361b 100644
--- a/examples/StrokeLine.cpp
+++ b/examples/StrokeLine.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //StrokeJoin & StrokeCap
         auto shape1 = tvg::Shape::gen();
         shape1->moveTo( 20, 50);
diff --git a/examples/StrokeMiterlimit.cpp b/examples/StrokeMiterlimit.cpp
index 836a81bc..3288c41f 100644
--- a/examples/StrokeMiterlimit.cpp
+++ b/examples/StrokeMiterlimit.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //background
         {
             auto bg = tvg::Shape::gen();
diff --git a/examples/Svg.cpp b/examples/Svg.cpp
index eeef5c12..6433ae26 100644
--- a/examples/Svg.cpp
+++ b/examples/Svg.cpp
@@ -75,8 +75,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //The default font for fallback in case
         tvg::Text::load(EXAMPLE_DIR"/font/Arial.ttf");
 
diff --git a/examples/Text.cpp b/examples/Text.cpp
index 839601fe..ee47d259 100644
--- a/examples/Text.cpp
+++ b/examples/Text.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Background
         auto shape = tvg::Shape::gen();
         shape->appendRect(0, 0, w, h);
diff --git a/examples/Transform.cpp b/examples/Transform.cpp
index d56b3f23..a7c1958f 100644
--- a/examples/Transform.cpp
+++ b/examples/Transform.cpp
@@ -35,8 +35,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         if (!tvgexam::verify(canvas->remove())) return false;
 
         auto progress = tvgexam::progress(elapsed, 2.0f, true);  //play time 2 sec.
diff --git a/examples/TrimPath.cpp b/examples/TrimPath.cpp
index 11328006..13b3e43a 100644
--- a/examples/TrimPath.cpp
+++ b/examples/TrimPath.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Shape 1
         auto shape1 = tvg::Shape::gen();
         shape1->appendCircle(245, 125, 50, 120);
diff --git a/examples/Update.cpp b/examples/Update.cpp
index 979fb8b1..f6c0a71c 100644
--- a/examples/Update.cpp
+++ b/examples/Update.cpp
@@ -30,8 +30,6 @@ struct UserExample : tvgexam::Example
 {
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //Shape
         auto shape = tvg::Shape::gen();
         shape->appendRect(-100, -100, 200, 200);
@@ -43,8 +41,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         if (!tvgexam::verify(canvas->remove())) return false;
 
         auto progress = tvgexam::progress(elapsed, 2.0f, true);  //play time 2 sec.
diff --git a/examples/Viewport.cpp b/examples/Viewport.cpp
index 9af0b7e9..96468309 100644
--- a/examples/Viewport.cpp
+++ b/examples/Viewport.cpp
@@ -34,8 +34,6 @@ struct UserExample : tvgexam::Example
 
     bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
     {
-        if (!canvas) return false;
-
         //set viewport before canvas become dirty.
         if (!tvgexam::verify(canvas->viewport(0, 0, VPORT_SIZE, VPORT_SIZE))) return false;
 
@@ -59,8 +57,6 @@ struct UserExample : tvgexam::Example
 
     bool update(tvg::Canvas* canvas, uint32_t elapsed) override
     {
-        if (!canvas) return false;
-
         auto progress = tvgexam::progress(elapsed, 2.0f, true);  //play time 2 sec.
 
         if (!tvgexam::verify(canvas->viewport((w - VPORT_SIZE) * progress, (h - VPORT_SIZE) * progress, VPORT_SIZE, VPORT_SIZE))) return false;