examples: added SceneEffect

added a showcase with a gaussian blur effect

examples/SceneEffect.cpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2024 the ThorVG project. All rights reserved.
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "Example.h"
+
+/************************************************************************/
+/* ThorVG Drawing Contents                                              */
+/************************************************************************/
+
+struct UserExample : tvgexam::Example
+{
+    tvg::Scene* pScene = nullptr;
+
+    bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
+    {
+        if (!canvas) return false;
+
+        //Prepare a scene for post effects.
+        auto scene = tvg::Scene::gen();
+        pScene = scene.get();
+
+        auto picture = tvg::Picture::gen();
+        picture->load(EXAMPLE_DIR"/svg/tiger.svg");
+        picture->size(w, h);
+
+        scene->push(std::move(picture));
+        canvas->push(std::move(scene));
+
+        return true;
+    }
+
+    bool update(tvg::Canvas* canvas, uint32_t elapsed) override
+    {
+        if (!canvas) return false;
+
+        canvas->clear(false);
+
+        auto progress = tvgexam::progress(elapsed, 2.5f, true);   //2.5 seconds
+
+        //Clear the previously applied effects
+        pScene->push(tvg::SceneEffect::ClearAll);
+
+        //Apply GaussianBlur post effect (sigma, direction, border option, quality)
+        pScene->push(tvg::SceneEffect::GaussianBlur, 10.0f * progress, 0, 0, 100);
+
+        canvas->update(pScene);
+
+        return true;
+    }
+
+};
+
+
+/************************************************************************/
+/* Entry Point                                                          */
+/************************************************************************/
+
+int main(int argc, char **argv)
+{
+    return tvgexam::main(new UserExample, argc, argv, 800, 800, 4, true);
+}

examples/meson.build

@@ -61,6 +61,7 @@ source_file = [
     'SceneBlending.cpp',
     'SceneTransform.cpp',
     'Shape.cpp',
+    'SceneEffect.cpp',
     'Stroke.cpp',
     'StrokeLine.cpp',
     'StrokeMiterlimit.cpp',