examples lottie: adds a basic example

src/examples/Common.h

@@ -73,6 +73,8 @@ static Eo* createSwView(uint32_t w = 800, uint32_t h = 800)
     return view;
 }
 
+#ifndef NO_GL_EXAMPLE
+
 void initGLview(Evas_Object *obj);
 void drawGLview(Evas_Object *obj);
 
@@ -101,3 +103,5 @@ static Eo* createGlView(uint32_t w = 800, uint32_t h = 800)
 
     return view;
 }
+
+#endif //NO_GL_EXAMPLE

src/examples/Lottie.cpp

@@ -0,0 +1,167 @@
+/*
+ * 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 <vector>
+#include "Common.h"
+
+/************************************************************************/
+/* Drawing Commands                                                     */
+/************************************************************************/
+
+#define NUM_PER_ROW 7
+#define NUM_PER_COL 7
+#define SIZE (WIDTH/NUM_PER_ROW)
+
+static int counter = 0;
+static Eo* view = nullptr;
+static std::vector<unique_ptr<tvg::Animation>> animations;
+static std::vector<Elm_Transit*> transitions;
+static unique_ptr<tvg::SwCanvas> swCanvas;
+
+
+void lottieDirCallback(const char* name, const char* path, void* data)
+{
+    //ignore if not lottie file.
+    const char *ext = name + strlen(name) - 4;
+    if (strcmp(ext, "json")) return;
+
+    char buf[PATH_MAX];
+    snprintf(buf, sizeof(buf), "/%s/%s", path, name);
+
+    //Animation Controller
+    auto animation = tvg::Animation::gen();
+    auto picture = animation->picture();
+
+    if (picture->load(buf) != 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 = SIZE / w;
+        shiftY = (SIZE - h * scale) * 0.5f;
+    } else {
+        scale = SIZE / h;
+        shiftX = (SIZE - w * scale) * 0.5f;
+    }
+
+    picture->scale(scale);
+    picture->translate((counter % NUM_PER_ROW) * SIZE + shiftX, (counter / NUM_PER_ROW) * (HEIGHT / NUM_PER_COL) + shiftY);
+
+    animations.push_back(std::move(animation));
+
+    cout << "Lottie: " << buf << endl;
+
+    counter++;
+}
+
+void tvgUpdateCmds(Elm_Transit_Effect *effect, Elm_Transit* transit, double progress)
+{
+    auto animation = static_cast<tvg::Animation*>(effect);
+
+    //Update animation frame
+    animation->frame(roundf(animation->totalFrame() * progress));
+
+    swCanvas->update(animation->picture());
+}
+
+void tvgSwTest(uint32_t* buffer)
+{
+    //Create a Canvas
+    swCanvas = tvg::SwCanvas::gen();
+    swCanvas->target(buffer, WIDTH, WIDTH, HEIGHT, tvg::SwCanvas::ARGB8888);
+
+    //Background
+    auto shape = tvg::Shape::gen();
+    shape->appendRect(0, 0, WIDTH, HEIGHT);
+    shape->fill(75, 75, 75);
+
+    if (swCanvas->push(std::move(shape)) != tvg::Result::Success) return;
+
+    eina_file_dir_list(EXAMPLE_DIR, EINA_TRUE, lottieDirCallback, swCanvas.get());
+   
+    //Run animation loop
+    for (auto& animation : animations) {
+        Elm_Transit* transit = elm_transit_add();
+        elm_transit_effect_add(transit, tvgUpdateCmds, animation.get(), nullptr);
+        elm_transit_duration_set(transit, animation->duration());
+        elm_transit_repeat_times_set(transit, -1);
+        elm_transit_go(transit);
+
+        swCanvas->push(unique_ptr<tvg::Picture>(animation->picture()));
+    }
+}
+
+void drawSwView(void* data, Eo* obj)
+{
+    if (swCanvas->draw() == tvg::Result::Success) {
+        swCanvas->sync();
+    }
+}
+
+Eina_Bool animatorCb(void *data)
+{
+    Eo* img = (Eo*) data;
+    evas_object_image_data_update_add(img, 0, 0, WIDTH, HEIGHT);
+    evas_object_image_pixels_dirty_set(img, EINA_TRUE);
+
+    return ECORE_CALLBACK_RENEW;
+}
+
+
+/************************************************************************/
+/* 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);
+
+        view = createSwView(1440, 1440);
+        ecore_animator_add(animatorCb, view);
+
+        elm_run();
+        elm_shutdown();
+
+        //Terminate ThorVG Engine
+        tvg::Initializer::term(tvg::CanvasEngine::Sw);
+
+    } else {
+        cout << "engine is not supported" << endl;
+    }
+    return 0;
+}

src/examples/images/ao.json

@@ -0,0 +1 @@
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src/examples/images/gradient_animated_background.json

@@ -0,0 +1 @@
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src/examples/images/gradient_sleepy_loader.json

@@ -0,0 +1 @@
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src/examples/meson.build

@@ -23,6 +23,7 @@ source_file = [
     'InvLumaMasking.cpp',
     'InvMasking.cpp',
     'LinearGradient.cpp',
+    'Lottie.cpp',
     'LumaMasking.cpp',
     'Masking.cpp',
     'MaskingMethods.cpp',