examples: added InvLumaMasking sample.

src/examples/InvLumaMasking.cpp

@@ -0,0 +1,224 @@
+/*
+ * 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"
+#include <fstream>
+
+/************************************************************************/
+/* Drawing Commands                                                     */
+/************************************************************************/
+
+void tvgDrawCmds(tvg::Canvas* canvas)
+{
+    if (!canvas) return;
+
+    //Solid Rectangle
+    auto shape = tvg::Shape::gen();
+    shape->appendRect(0, 0, 400, 400, 0, 0);
+    shape->fill(255, 0, 0, 255);
+
+    //Mask
+    auto mask = tvg::Shape::gen();
+    mask->appendCircle(200, 200, 125, 125);
+    mask->fill(255, 100, 255, 255);
+
+    //Nested Mask
+    auto nMask = tvg::Shape::gen();
+    nMask->appendCircle(220, 220, 125, 125);
+    nMask->fill(255, 200, 255, 255);
+
+    mask->composite(std::move(nMask), tvg::CompositeMethod::InvLumaMask);
+    shape->composite(std::move(mask), tvg::CompositeMethod::InvLumaMask);
+    canvas->push(std::move(shape));
+
+    //SVG
+    auto svg = tvg::Picture::gen();
+    if (svg->load(EXAMPLE_DIR"/cartman.svg") != tvg::Result::Success) return;
+    svg->opacity(100);
+    svg->scale(3);
+    svg->translate(50, 400);
+
+    //Mask2
+    auto mask2 = tvg::Shape::gen();
+    mask2->appendCircle(150, 500, 75, 75);
+    mask2->appendRect(150, 500, 200, 200, 30, 30);
+    mask2->fill(255, 255, 255, 255);
+    svg->composite(std::move(mask2), tvg::CompositeMethod::InvLumaMask);
+    if (canvas->push(std::move(svg)) != tvg::Result::Success) return;
+
+    //Star
+    auto star = tvg::Shape::gen();
+    star->fill(80, 80, 80, 255);
+    star->moveTo(599, 34);
+    star->lineTo(653, 143);
+    star->lineTo(774, 160);
+    star->lineTo(687, 244);
+    star->lineTo(707, 365);
+    star->lineTo(599, 309);
+    star->lineTo(497, 365);
+    star->lineTo(512, 245);
+    star->lineTo(426, 161);
+    star->lineTo(546, 143);
+    star->close();
+    star->stroke(10);
+    star->stroke(255, 255, 255, 255);
+
+    //Mask3
+    auto mask3 = tvg::Shape::gen();
+    mask3->appendCircle(600, 200, 125, 125);
+    mask3->fill(0, 255, 255, 255);
+    star->composite(std::move(mask3), tvg::CompositeMethod::InvLumaMask);
+    if (canvas->push(std::move(star)) != tvg::Result::Success) return;
+
+    //Image
+    ifstream file(EXAMPLE_DIR"/rawimage_200x300.raw");
+    if (!file.is_open()) return;
+    auto data = (uint32_t*) malloc(sizeof(uint32_t) * (200 * 300));
+    file.read(reinterpret_cast<char *>(data), sizeof (uint32_t) * 200 * 300);
+    file.close();
+
+    auto image = tvg::Picture::gen();
+    if (image->load(data, 200, 300, true) != tvg::Result::Success) return;
+    image->translate(500, 400);
+
+    //Mask4
+    auto mask4 = tvg::Scene::gen();
+    auto mask4_rect = tvg::Shape::gen();
+    mask4_rect->appendRect(500, 400, 200, 300, 0, 0);
+    mask4_rect->fill(255, 255, 255, 255);
+    auto mask4_circle = tvg::Shape::gen();
+    mask4_circle->appendCircle(600, 550, 125, 125);
+    mask4_circle->fill(128, 0, 128, 224);
+    if (mask4->push(std::move(mask4_rect)) != tvg::Result::Success) return;
+    if (mask4->push(std::move(mask4_circle)) != tvg::Result::Success) return;
+    image->composite(std::move(mask4), tvg::CompositeMethod::InvLumaMask);
+    if (canvas->push(std::move(image)) != tvg::Result::Success) return;
+
+    free(data);
+}
+
+
+/************************************************************************/
+/* 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/meson.build

@@ -20,6 +20,7 @@ source_file = [
     'GradientTransform.cpp',
     'ImageScaleDown.cpp',
     'ImageScaleUp.cpp',
+    'InvLumaMasking.cpp',
     'InvMasking.cpp',
     'LinearGradient.cpp',
     'LumaMasking.cpp',