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Currently I use the Drawimage method of the Graphics class. However, the speed of drawing in the components is very slow. How can I optimize its use ?
Libraries like Monogame or Opentk can perform better in this regard ?
Here is an example of code in the overload of the Onpaint method.
if (m_IsThumbnail)
for (int j = 0; j < 3; j++)
{
g.DrawLine(new Pen(Color.DarkGray),
new Point(dl + 3, dt + dh + 1 + j),
new Point(dl + dw + 3, dt + dh + 1 + j));
g.DrawLine(new Pen(Color.DarkGray),
new Point(dl + dw + 1 + j, dt + 3),
new Point(dl + dw + 1 + j, dt + dh + 3));
}
XImage = dl;
YImage = dt;
g.DrawImage(m_Image, dl, dt, dw, dh); // lentidão.
That’s right
ifwithout the keys ({and})? The way it is (without the keys) it only includes the loopforand perhaps the rest (including the call from yourDrawImage) is being run unnecessarily at every painting upgrade... Moreover, as your call toDrawImagesize, maybe your code is doing resizing every new painting. This is often costly, and can be easily solved by keeping and reusing a previously reduced/enlarged copy of the image.– Luiz Vieira
As for if, that’s right. In my case, the tie is not very expensive. The neck focuses on the Drawimage method. The Drawimage method no . NET is always slow. It uses GDI+, I have visited other forums and other people have the same problem of slowness when using this method.
– Pedro
Ok. Well, even so, it might be worth taking a look if your call isn’t doing any costly resizing. In this SOEN response has other tips that may also be useful. And if you’ve come up with an alternative that works better, I suggest posting an answer with her to eventually help other colleagues in the future. :)
– Luiz Vieira