thorvg/examples/ImageScaling.cpp
Hermet Park 39b0f87cb3 api: revise the canvas update() API
Removed the paint parameter previously used to forcibly
update a single paint.

This behavior was unsafe in ThorVG, as a single paint
object may be connected to others through the scene graph.

Now, the canvas engine is responsible for properly updating
all damaged paints as needed, allowing the user to simply
call update() in any case.

API Modifications:

C++ API:
 * Result Canvas::update(Paint* paint) -> Result Canvas::update()

CAPI:
 - tvg_canvas_update_paint()

Issue: https://github.com/thorvg/thorvg/issues/3116
2025-06-16 10:43:13 +09:00

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C++

/*
* Copyright (c) 2021 - 2025 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 "Example.h"
/************************************************************************/
/* ThorVG Drawing Contents */
/************************************************************************/
struct UserExample : tvgexam::Example
{
tvg::Picture* picture = nullptr;
bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
{
if (!canvas) return false;
//Original
picture = tvg::Picture::gen();
if (!tvgexam::verify(picture->load(EXAMPLE_DIR"/image/scale.jpg"))) return false;
picture->scale(1.5f);
canvas->push(picture);
return true;
}
bool update(tvg::Canvas* canvas, uint32_t elapsed) override
{
if (!canvas) return false;
auto progress = tvgexam::progress(elapsed, 3.0f, true); //play time 3 secs.
picture->scale((1.0f - progress) * 1.5f);
canvas->update();
return true;
}
};
/************************************************************************/
/* Entry Point */
/************************************************************************/
int main(int argc, char **argv)
{
return tvgexam::main(new UserExample, argc, argv, true, 1024, 1024);
}