example: code clean up++

that exception handling is helpless

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");

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

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

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);

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);

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.

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

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

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

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);

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};

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();

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};

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.

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

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);

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

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");
 

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");
 

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);

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;

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);
 

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;

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;

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;

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)

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) {

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

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

examples/PicturePng.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

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);

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");
 

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

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

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) {

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();
 

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);

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)

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.

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

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);

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);

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();

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");
 

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);

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.

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);

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.

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;