examples: add SceneBlending

src/examples/SceneBlending.cpp

@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 2023 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 "Common.h"
+
+/************************************************************************/
+/* Drawing Commands                                                     */
+/************************************************************************/
+
+void tvgDrawCmds(tvg::Canvas* canvas)
+{
+    if (!canvas) return;
+
+    //BG 
+    auto bg = tvg::Shape::gen();
+    bg->appendRect(0, 0, WIDTH, HEIGHT);
+    bg->fill(100, 100, 100);
+    canvas->push(std::move(bg));
+
+    //Create a Scene
+    auto scene = tvg::Scene::gen();
+    scene->blend(tvg::BlendMethod::Add);
+
+    //Prepare Circle
+    auto shape1 = tvg::Shape::gen();
+    shape1->appendCircle(400, 400, 250, 250);
+    shape1->fill(255, 255, 0);
+    scene->push(std::move(shape1));
+
+    //Round rectangle
+    auto shape2 = tvg::Shape::gen();
+    shape2->appendRect(450, 100, 200, 200, 50, 50);
+    shape2->fill(0, 255, 0);
+    shape2->stroke(10);
+    shape2->stroke(255, 255, 255);
+    scene->push(std::move(shape2));
+
+    //Draw the Scene onto the Canvas
+    canvas->push(std::move(scene));
+
+    //Create a Scene 2
+    auto scene2 = tvg::Scene::gen();
+    scene2->opacity(127);              //Apply opacity to scene (0 - 255)
+    scene2->blend(tvg::BlendMethod::Overlay);
+    scene2->scale(1.2);
+
+    //Star
+    auto shape3 = tvg::Shape::gen();
+
+    //Appends Paths
+    shape3->moveTo(199, 34);
+    shape3->lineTo(253, 143);
+    shape3->lineTo(374, 160);
+    shape3->lineTo(287, 244);
+    shape3->lineTo(307, 365);
+    shape3->lineTo(199, 309);
+    shape3->lineTo(97, 365);
+    shape3->lineTo(112, 245);
+    shape3->lineTo(26, 161);
+    shape3->lineTo(146, 143);
+    shape3->close();
+    shape3->fill(0, 0, 255);
+    shape3->stroke(10);
+    shape3->stroke(255, 255, 255);
+    shape3->opacity(127);
+
+    scene2->push(std::move(shape3));
+
+    //Circle
+    auto shape4 = tvg::Shape::gen();
+
+    auto cx = 150.0f;
+    auto cy = 150.0f;
+    auto radius = 50.0f;
+    auto halfRadius = radius * 0.552284f;
+
+    //Append Paths
+    shape4->moveTo(cx, cy - radius);
+    shape4->cubicTo(cx + halfRadius, cy - radius, cx + radius, cy - halfRadius, cx + radius, cy);
+    shape4->cubicTo(cx + radius, cy + halfRadius, cx + halfRadius, cy + radius, cx, cy+ radius);
+    shape4->cubicTo(cx - halfRadius, cy + radius, cx - radius, cy + halfRadius, cx - radius, cy);
+    shape4->cubicTo(cx - radius, cy - halfRadius, cx - halfRadius, cy - radius, cx, cy - radius);
+    shape4->close();
+    shape4->fill(255, 0, 0);
+    shape4->stroke(10);
+    shape4->stroke(0, 0, 255);
+    shape4->opacity(200);
+    shape4->scale(3);
+    scene2->push(std::move(shape4));
+
+    //Draw the Scene onto the Canvas
+    canvas->push(std::move(scene2));
+}
+
+
+/************************************************************************/
+/* Sw Engine Test Code                                                  */
+/************************************************************************/
+
+static unique_ptr<tvg::SwCanvas> swCanvas;
+
+void tvgSwTest(uint32_t* buffer)
+{
+    //Create a Canvas
+    swCanvas = tvg::SwCanvas::gen();
+    swCanvas->target(buffer, WIDTH, WIDTH, HEIGHT, tvg::SwCanvas::ARGB8888);
+
+    /* Push the shape into the Canvas drawing list
+       When this shape is into the canvas list, the shape could update & prepare
+       internal data asynchronously for coming rendering.
+       Canvas keeps this shape node unless user call canvas->clear() */
+    tvgDrawCmds(swCanvas.get());
+}
+
+void drawSwView(void* data, Eo* obj)
+{
+    if (swCanvas->draw() == tvg::Result::Success) {
+        swCanvas->sync();
+    }
+}
+
+
+/************************************************************************/
+/* GL Engine Test Code                                                  */
+/************************************************************************/
+
+static unique_ptr<tvg::GlCanvas> glCanvas;
+
+void initGLview(Evas_Object *obj)
+{
+    static constexpr auto BPP = 4;
+
+    //Create a Canvas
+    glCanvas = tvg::GlCanvas::gen();
+    glCanvas->target(nullptr, WIDTH * BPP, WIDTH, HEIGHT);
+
+    /* Push the shape into the Canvas drawing list
+       When this shape is into the canvas list, the shape could update & prepare
+       internal data asynchronously for coming rendering.
+       Canvas keeps this shape node unless user call canvas->clear() */
+    tvgDrawCmds(glCanvas.get());
+}
+
+void drawGLview(Evas_Object *obj)
+{
+    auto gl = elm_glview_gl_api_get(obj);
+    gl->glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+    gl->glClear(GL_COLOR_BUFFER_BIT);
+
+    if (glCanvas->draw() == tvg::Result::Success) {
+        glCanvas->sync();
+    }
+}
+
+
+/************************************************************************/
+/* Main Code                                                            */
+/************************************************************************/
+
+int main(int argc, char **argv)
+{
+    tvg::CanvasEngine tvgEngine = tvg::CanvasEngine::Sw;
+
+    if (argc > 1) {
+        if (!strcmp(argv[1], "gl")) tvgEngine = tvg::CanvasEngine::Gl;
+    }
+
+    //Initialize ThorVG Engine
+    if (tvgEngine == tvg::CanvasEngine::Sw) {
+        cout << "tvg engine: software" << endl;
+    } else {
+        cout << "tvg engine: opengl" << endl;
+    }
+
+    //Threads Count
+    auto threads = std::thread::hardware_concurrency();
+    if (threads > 0) --threads;    //Allow the designated main thread capacity
+
+    //Initialize ThorVG Engine
+    if (tvg::Initializer::init(tvgEngine, threads) == tvg::Result::Success) {
+
+
+        elm_init(argc, argv);
+
+        if (tvgEngine == tvg::CanvasEngine::Sw) {
+            createSwView();
+        } else {
+            createGlView();
+        }
+
+        elm_run();
+        elm_shutdown();
+
+        //Terminate ThorVG Engine
+        tvg::Initializer::term(tvgEngine);
+
+    } else {
+        cout << "engine is not supported" << endl;
+    }
+    return 0;
+}

src/examples/StrokeMiterlimit.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020 - 2023 the ThorVG project. All rights reserved.
+ * Copyright (c) 2023 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

src/examples/meson.build

@@ -39,6 +39,7 @@ source_file = [
     'PictureWebp.cpp',
     'RadialGradient.cpp',
     'Scene.cpp',
+    'SceneBlending.cpp',
     'SceneClipper.cpp',
     'SceneTransform.cpp',
     'Shape.cpp',