examples: added a viewport sample

examples/Performance.cpp

@@ -56,8 +56,6 @@ void tvgUpdateCmds(tvg::Canvas* canvas, float progress)
 
     canvas->clear(false);
 
-    canvas->clear(false);
-
     pPicture->translate(WIDTH * progress * 0.05f, HEIGHT * progress * 0.05f);
 
     auto before = ecore_time_get();

examples/Viewport.cpp

@@ -0,0 +1,217 @@
+/*
+ * 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 "Common.h"
+
+/************************************************************************/
+/* Drawing Commands                                                     */
+/************************************************************************/
+
+static tvg::Picture* pPicture = nullptr;
+static double updateTime = 0;
+static double accumulateTime = 0;
+static uint32_t cnt = 0;
+static bool reqSync = false;
+
+void tvgDrawCmds(tvg::Canvas* canvas)
+{
+    if (!canvas) return;
+
+    auto mask = tvg::Shape::gen();
+    mask->appendCircle(WIDTH/2, HEIGHT/2, WIDTH/2, HEIGHT/2);    
+    mask->fill(255, 255, 255);
+    //Use the opacity for a half-translucent mask.
+    mask->opacity(125);
+
+    auto picture = tvg::Picture::gen();
+    picture->load(EXAMPLE_DIR"/svg/tiger.svg");
+    picture->size(WIDTH, HEIGHT);
+    picture->composite(std::move(mask), tvg::CompositeMethod::AlphaMask);
+    pPicture = picture.get();
+    canvas->push(std::move(picture));
+}
+
+void tvgUpdateCmds(tvg::Canvas* canvas, float progress)
+{
+    constexpr uint32_t VPORT_SIZE = 300;
+
+    if (!canvas || reqSync) return;
+
+    canvas->clear(false);
+
+    canvas->viewport((WIDTH - VPORT_SIZE) * progress, (HEIGHT - VPORT_SIZE) * progress, VPORT_SIZE, VPORT_SIZE);
+
+    auto before = ecore_time_get();
+
+    canvas->update();
+
+    auto after = ecore_time_get();
+
+    updateTime = after - before;
+
+    reqSync = true;
+}
+
+
+/************************************************************************/
+/* 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 transitSwCb(Elm_Transit_Effect *effect, Elm_Transit* transit, double progress)
+{
+    tvgUpdateCmds(swCanvas.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);
+}
+
+void drawSwView(void* data, Eo* obj)
+{
+    auto before = ecore_time_get();
+
+    if (swCanvas->draw() == tvg::Result::Success) {
+        swCanvas->sync();
+        reqSync = false;
+    }
+
+    auto after = ecore_time_get();
+
+    auto rasterTime = after - before;
+
+    ++cnt;
+
+    accumulateTime += (updateTime + rasterTime);
+
+    printf("[%5d]: rendering = %fs,  average = %fs\n", cnt, updateTime + rasterTime, accumulateTime / cnt);
+}
+
+
+/************************************************************************/
+/* GL Engine Test Code                                                  */
+/************************************************************************/
+
+static unique_ptr<tvg::GlCanvas> glCanvas;
+
+void initGLview(Evas_Object *obj)
+{
+    //Create a Canvas
+    glCanvas = tvg::GlCanvas::gen();
+
+    //Get the drawing target id
+    int32_t targetId;
+    auto gl = elm_glview_gl_api_get(obj);
+    gl->glGetIntegerv(GL_FRAMEBUFFER_BINDING, &targetId);
+
+    glCanvas->target(targetId, 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();
+    }
+}
+
+void transitGlCb(Elm_Transit_Effect *effect, Elm_Transit* transit, double progress)
+{
+    tvgUpdateCmds(glCanvas.get(), progress);
+    elm_glview_changed_set((Evas_Object*)effect);
+}
+
+
+/************************************************************************/
+/* Main Code                                                            */
+/************************************************************************/
+
+int main(int argc, char **argv)
+{
+    auto tvgEngine = tvg::CanvasEngine::Sw;
+
+    if (argc > 1) {
+        if (!strcmp(argv[1], "gl")) tvgEngine = tvg::CanvasEngine::Gl;
+    }
+
+    //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(threads) == tvg::Result::Success) {
+
+        elm_init(argc, argv);
+
+        Elm_Transit *transit = elm_transit_add();
+
+        if (tvgEngine == tvg::CanvasEngine::Sw) {
+            auto view = createSwView(1024, 1024);
+            elm_transit_effect_add(transit, transitSwCb, view, nullptr);
+        } else {
+            auto view = createGlView(1024, 1024);
+            elm_transit_effect_add(transit, transitGlCb, view, nullptr);
+        }
+
+        elm_transit_duration_set(transit, 2);
+        elm_transit_repeat_times_set(transit, -1);
+        elm_transit_auto_reverse_set(transit, EINA_TRUE);
+        elm_transit_go(transit);
+
+        elm_run();
+
+        elm_transit_del(transit);
+
+        elm_shutdown();
+
+        //Terminate ThorVG Engine
+        tvg::Initializer::term();
+
+    } else {
+        cout << "engine is not supported" << endl;
+    }
+    return 0;
+}

examples/meson.build

@@ -58,6 +58,7 @@ source_file = [
     'Tvg.cpp',
     'TvgSaver.cpp',
     'Update.cpp',
+    'Viewport.cpp'
 ]