ThorVG - test (lightweight vector graphics engine)

[ALLIGATOR]

https://www.thorvg.org/

I tried this library on Windows x64 - it looks pretty good

I loaded a Lottie animation, rendering (in this case) on the CPU

It doesn't seem to slow down, but it can be significantly accelerated (on Windows), IMHO, since most of the load is currently due to Lazarus abstraction layers, IMHO

I didn't test it on Linux (although I really wanted to), because the library needs to be compiled. I just took the ready-made one from GitHub, where there was a compiled binary for Windows x64, but not for Linux

As for compiling it myself, I don't feel like messing with C++ and its compilation systems at the moment

[ALLIGATOR]

animation

[LeP]

I try it with little modifications to view SVG files.

The colours are not aligned (try with different viewer that give the same results, except in thorvg) ... look at attached image.

In many case, where the SVG is more complex it throw an math exception (divide by zero). To resolve this you have to add:

Code: Pascal  [Select][+][-]

1. SetExceptionMask(GetExceptionMask + [exOverflow,exZeroDivide,exInvalidOp]);

this is normally when you have to do with C Microsoft Dll.

But, except for colours, seems to be good with very complex svg images too ... better then Skia.

P.S.: Colours not aligned, I meant the colours are not right, some kind is right others not (it's like the typical inversion of the plane R,G,B that affects also PNG sometimes).

[ALLIGATOR]

I meant the colours are not right, some kind is right others not

It looks like some kind of alpha channel mix-up
You need to make the background the same for the shape and the tool you used to get the second image

And you can also play around with the modes, where you can choose different RGB8888 settings

[ALLIGATOR]

But in general, I tested very limitedly, as soon as I made sure that Lottie animations worked, and slightly removed Lazarus overhead for working with image data - I immediately loaded the result

[LeP]

I meant the colours are not right, some kind is right others not

It looks like some kind of alpha channel mix-up
You need to make the background the same for the shape and the tool you used to get the second image

What background ? The "orginal" image is viewer with Firefox (the "original" image attached), Edge or others tools without setting nothing.

[ALLIGATOR]

What background ? The "orginal" image is viewer with Firefox (the "original" image attached), Edge or others tools without setting nothing.

I corrected the message
But you'd better send the svg file then 

[LeP]

What background ? The "orginal" image is viewer with Firefox (the "original" image attached), Edge or others tools without setting nothing.

I corrected the message
But you'd better send the svg file then 

Code: Text  [Select][+][-]

1. <svg width="120" height="120" viewBox="0 0 240 120"
2.    xmlns="http://www.w3.org/2000/svg">
3.   <defs>
4.     <radialGradient id="exampleGradient">
5.       <stop offset="10%" stop-color="gold"/>
6.       <stop offset="95%" stop-color="green"/>
7.     </radialGradient>
8.     <radialGradient spreadMethod="reflect"
9.                     cx="50%"
10.                     cy="50%"
11.                     r="50%"
12.                     fx="25%"
13.                     fy="75%"
14.                     fr="10%"
15.                    id="flameGradient">
16.       <stop offset="0%" stop-color="white"/>
17.       <stop offset="10%" stop-color="yellow"/>
18.       <stop offset="95%" stop-color="red"/>
19.     </radialGradient>
20.   </defs>
21.   <circle fill="url(#exampleGradient)" cx="60" cy="60" r="50"/>
22.   <circle fill="url(#flameGradient)" cx="180" cy="60" r="50"/>
23. </svg>

[ALLIGATOR]

Code: Text  [Select][+][-]

1. <svg>

Code: Diff  [Select][+][-]

1. -   tvg_swcanvas_set_target(tvgCanvas, PUInt32(b.RawImage.Data), PaintBox1.Width, PaintBox1.Width, PaintBox1.Height, TVG_COLORSPACE_ABGR8888S);
2. +   tvg_swcanvas_set_target(tvgCanvas, PUInt32(b.RawImage.Data), PaintBox1.Width, PaintBox1.Width, PaintBox1.Height, TVG_COLORSPACE_ARGB8888S);

And everything will be OK

[ALLIGATOR]

seems to be good with very complex svg images too ... better then Skia

Especially the size of the library! Just look how tiny it is, and if you link it statically, it will be even smaller!

[LeP]

Code: Diff  [Select][+][-]

1. -   tvg_swcanvas_set_target(tvgCanvas, PUInt32(b.RawImage.Data), PaintBox1.Width, PaintBox1.Width, PaintBox1.Height, TVG_COLORSPACE_ABGR8888S);
2. +   tvg_swcanvas_set_target(tvgCanvas, PUInt32(b.RawImage.Data), PaintBox1.Width, PaintBox1.Width, PaintBox1.Height, TVG_COLORSPACE_ARGB8888S);

And everything will be OK

OK

Especially the size of the library! Just look how tiny it is, and if you link it statically, it will be even smaller!

Yes, but I use Delphi and SKIA or Image32 are integrated in pure Pascal without any external DLL.
Other thing is that I need the DLL signed or I should compile the DLL myself (in simple way without python, perl, php, etc ...).
All my software are signed.

[hermet]

Yes, but I use Delphi and SKIA or Image32 are integrated in pure Pascal without any external DLL.
Other thing is that I need the DLL signed or I should compile the DLL myself (in simple way without python, perl, php, etc ...).
All my software are signed.

Why not use the static library of ThorVG? 🙂

[ALLIGATOR]

Why not use the static library of ThorVG? 🙂

What???? The author of the library is here? On the FreePascal forum? No way!

[Roland57]

I didn't test it on Linux (although I really wanted to), because the library needs to be compiled. I just took the ready-made one from GitHub, where there was a compiled binary for Windows x64, but not for Linux

Hello! Thank you for sharing. I could compile easily the library under Linux:

Code: Bash  [Select][+][-]

1. meson setup builddir
2. ninja -C builddir install

I could also compile the Lazarus project, but when I start the program, I get a violation access, then a blank window, and then the window of the application, with the word "Cat".

[ALLIGATOR]

I could compile easily the library under Linux

Share the *.so file (I may not be able to use it due to some incompatibility with system libraries, but I'll give it a try)

Also, maybe this advice can help you?

In many case, where the SVG is more complex it throw an math exception (divide by zero). To resolve this you have to add:

Code: Pascal  [Select][+][-]

1. SetExceptionMask(GetExceptionMask + [exOverflow,exZeroDivide,exInvalidOp]);

this is normally when you have to do with C Microsoft Dll