examples: add FillSpread example

@Issue: https://github.com/thorvg/thorvg/issues/2124

examples/FillSpread.cpp

@@ -0,0 +1,230 @@
+/*
+ * 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                                                     */
+/************************************************************************/
+
+void tvgDrawCmds(tvg::Canvas* canvas)
+{
+    if (!canvas) return;
+
+    const int colorCnt = 4;
+    tvg::Fill::ColorStop colorStops[colorCnt];
+    colorStops[0] = {0.0f, 127, 39, 255, 255};
+    colorStops[1] = {0.33f, 159, 112, 253, 255};
+    colorStops[2] = {0.66f, 253, 191, 96, 255};
+    colorStops[3] = {1.0f, 255, 137, 17, 255};
+
+    //Radial grad
+    {
+        float x1, y1 = 80.0f, r = 120.0f;
+
+        //Pad
+        x1 = 20.0f;
+        auto shape1 = tvg::Shape::gen();
+        shape1->appendRect(x1, y1, 2.0f * r, 2.0f * r);
+
+        auto fill1 = tvg::RadialGradient::gen();
+        fill1->radial(x1 + r, y1 + r, 40.0f);
+        fill1->colorStops(colorStops, colorCnt);
+        fill1->spread(tvg::FillSpread::Pad);
+        shape1->fill(std::move(fill1));
+
+        if (canvas->push(std::move(shape1)) != tvg::Result::Success) return;
+
+        //Reflect
+        x1 = 280.0f;
+        auto shape2 = tvg::Shape::gen();
+        shape2->appendRect(x1, y1, 2.0f * r, 2.0f * r);
+
+        auto fill2 = tvg::RadialGradient::gen();
+        fill2->radial(x1 + r, y1 + r, 40.0f);
+        fill2->colorStops(colorStops, colorCnt);
+        fill2->spread(tvg::FillSpread::Reflect);
+        shape2->fill(std::move(fill2));
+
+        if (canvas->push(std::move(shape2)) != tvg::Result::Success) return;
+
+        //Repeat
+        x1 = 540.0f;
+        auto shape3 = tvg::Shape::gen();
+        shape3->appendRect(x1, y1, 2.0f * r, 2.0f * r);
+
+        auto fill3 = tvg::RadialGradient::gen();
+        fill3->radial(x1 + r, y1 + r, 40.0f);
+        fill3->colorStops(colorStops, colorCnt);
+        fill3->spread(tvg::FillSpread::Repeat);
+        shape3->fill(std::move(fill3));
+
+        if (canvas->push(std::move(shape3)) != tvg::Result::Success) return;
+    }
+
+    //Linear grad
+    {
+        float x1, y1 = 480.0f, r = 120.0f;
+
+        //Pad
+        x1 = 20.0f;
+        auto shape1 = tvg::Shape::gen();
+        shape1->appendRect(x1, y1, 2.0f * r, 2.0f * r);
+
+        auto fill1 = tvg::LinearGradient::gen();
+        fill1->linear(x1, y1, x1 + 50.0f, y1 + 50.0f);
+        fill1->colorStops(colorStops, colorCnt);
+        fill1->spread(tvg::FillSpread::Pad);
+        shape1->fill(std::move(fill1));
+
+        if (canvas->push(std::move(shape1)) != tvg::Result::Success) return;
+
+        //Reflect
+        x1 = 280.0f;
+        auto shape2 = tvg::Shape::gen();
+        shape2->appendRect(x1, y1, 2.0f * r, 2.0f * r);
+
+        auto fill2 = tvg::LinearGradient::gen();
+        fill2->linear(x1, y1, x1 + 50.0f, y1 + 50.0f);
+        fill2->colorStops(colorStops, colorCnt);
+        fill2->spread(tvg::FillSpread::Reflect);
+        shape2->fill(std::move(fill2));
+
+        if (canvas->push(std::move(shape2)) != tvg::Result::Success) return;
+
+        //Repeat
+        x1 = 540.0f;
+        auto shape3 = tvg::Shape::gen();
+        shape3->appendRect(x1, y1, 2.0f * r, 2.0f * r);
+
+        auto fill3 = tvg::LinearGradient::gen();
+        fill3->linear(x1, y1, x1 + 50.0f, y1 + 50.0f);
+        fill3->colorStops(colorStops, colorCnt);
+        fill3->spread(tvg::FillSpread::Repeat);
+        shape3->fill(std::move(fill3));
+
+        if (canvas->push(std::move(shape3)) != tvg::Result::Success) return;
+    }
+}
+
+/************************************************************************/
+/* Sw Engine Test Code                                                  */
+/************************************************************************/
+
+static unique_ptr<tvg::SwCanvas> swCanvas;
+
+void initSwView(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)
+{
+    //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();
+    }
+}
+
+
+/************************************************************************/
+/* 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);
+
+        if (tvgEngine == tvg::CanvasEngine::Sw) {
+            createSwView();
+        } else {
+            createGlView();
+        }
+
+        elm_run();
+        elm_shutdown();
+
+        //Terminate ThorVG Engine
+        tvg::Initializer::term();
+
+    } else {
+        cout << "engine is not supported" << endl;
+    }
+    return 0;
+}

examples/meson.build

@@ -16,6 +16,7 @@ source_file = [
     'DirectUpdate.cpp',
     'Duplicate.cpp',
     'FillRule.cpp',
+    'FillSpread.cpp',
     'GifSaver.cpp',
     'GradientMasking.cpp',
     'GradientStroke.cpp',