thorvg/examples/ImageScaleDown.cpp

/*
 * Copyright (c) 2021 - 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;

void tvgDrawCmds(tvg::Canvas* canvas)
{
    if (!canvas) return;

    //Original
    auto picture = tvg::Picture::gen();

    if (picture->load(EXAMPLE_DIR"/image/scaledown.jpg") != tvg::Result::Success) {
        cout << "The PNG file is not loaded correctly. Did you enable PNG Loader?" << endl;
        return;
    }
    pPicture = picture.get();
    if (canvas->push(std::move(picture)) != tvg::Result::Success) {
        pPicture = nullptr;
    }
}

void tvgUpdateCmds(tvg::Canvas* canvas, float progress)
{
    if (!canvas || !pPicture) return;

    canvas->clear(false);

    pPicture->scale(1.0f - progress);

    canvas->update(pPicture);
}

/************************************************************************/
/* 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 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)
{
    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();
    }
}

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();
            elm_transit_effect_add(transit, transitSwCb, view, nullptr);
        } else {
            auto view = createGlView();
            elm_transit_effect_add(transit, transitGlCb, view, nullptr);
        }

        elm_transit_duration_set(transit, 7);
        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;
}