examples animation: adds a basic example.

src/examples/Animation.cpp

@@ -0,0 +1,142 @@
+/*
+ * 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.
+ */
+
+#define NO_GL_EXAMPLE
+
+#include "Common.h"
+
+/************************************************************************/
+/* Drawing Commands                                                     */
+/************************************************************************/
+
+void tvgUpdateCmds(tvg::Canvas* canvas, tvg::Animation* animation, float progress)
+{
+    if (!canvas) return;
+
+    //Update animation frame
+    animation->frame(roundf(animation->totalFrame() * progress));
+
+    canvas->update(animation->picture());
+}
+
+
+/************************************************************************/
+/* Sw Engine Test Code                                                  */
+/************************************************************************/
+
+static unique_ptr<tvg::SwCanvas> swCanvas;
+static unique_ptr<tvg::Animation> animation;
+static Elm_Transit *transit;
+
+void tvgSwTest(uint32_t* buffer)
+{
+    //Create a Canvas
+    swCanvas = tvg::SwCanvas::gen();
+    swCanvas->target(buffer, WIDTH, WIDTH, HEIGHT, tvg::SwCanvas::ARGB8888);
+
+    //Animation Controller
+    animation = tvg::Animation::gen();
+    auto picture = animation->picture();
+
+    //Background
+    auto shape = tvg::Shape::gen();
+    shape->appendRect(0, 0, WIDTH, HEIGHT);
+    shape->fill(50, 50, 50);
+
+    if (swCanvas->push(std::move(shape)) != tvg::Result::Success) return;
+
+    if (picture->load(EXAMPLE_DIR"/sample.json") != tvg::Result::Success) {
+        cout << "Lottie is not supported. Did you enable Lottie Loader?" << endl;
+        return;
+    }
+
+    //image scaling preserving its aspect ratio
+    float scale;
+    float shiftX = 0.0f, shiftY = 0.0f;
+    float w, h;
+    picture->size(&w, &h);
+
+    if (w > h) {
+        scale = WIDTH / w;
+        shiftY = (HEIGHT - h * scale) * 0.5f;
+    } else {
+        scale = HEIGHT / h;
+        shiftX = (WIDTH - w * scale) * 0.5f;
+    }
+
+    picture->scale(scale);
+    picture->translate(shiftX, shiftY);
+
+    swCanvas->push(unique_ptr<tvg::Picture>(picture));
+
+    //Run animation loop
+    elm_transit_duration_set(transit, animation->duration());
+    elm_transit_repeat_times_set(transit, -1);
+    elm_transit_go(transit);
+}
+
+void drawSwView(void* data, Eo* obj)
+{
+    if (swCanvas->draw() == tvg::Result::Success) {
+        swCanvas->sync();
+    }
+}
+
+void transitSwCb(Elm_Transit_Effect *effect, Elm_Transit* transit, double progress)
+{
+    tvgUpdateCmds(swCanvas.get(), animation.get(), progress);
+
+    //Update Efl Canvas
+    Eo* img = (Eo*) effect;
+    evas_object_image_data_update_add(img, 0, 0, WIDTH, HEIGHT);
+    evas_object_image_pixels_dirty_set(img, EINA_TRUE);
+}
+
+
+/************************************************************************/
+/* Main Code                                                            */
+/************************************************************************/
+
+int main(int argc, char **argv)
+{
+    //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(tvg::CanvasEngine::Sw, threads) == tvg::Result::Success) {
+
+        elm_init(argc, argv);
+
+        transit = elm_transit_add();
+        auto view = createSwView();
+        elm_transit_effect_add(transit, transitSwCb, view, nullptr);
+
+        elm_run();
+        elm_shutdown();
+
+        //Terminate ThorVG Engine
+        tvg::Initializer::term(tvg::CanvasEngine::Sw);
+    }
+
+    return 0;
+}

src/examples/meson.build

@@ -7,6 +7,7 @@ examples_dep = dependency('elementary', required : true)
 source_file = [
     'Accessor.cpp',
     'AnimateMasking.cpp',
+    'Animation.cpp',
     'Arc.cpp',
     'Async.cpp',
     'Blending.cpp',