Re: [fltk.general] Re: Can custom box type functions handle their own high-DPI screen scaling?

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Re: Re: Can custom box type functions handle their own high-DPI screen scaling? Albrecht Schlosser Feb 24, 2021

On 2/24/21 6:59 PM Manolo wrote:

The possibility to draw using an unscaled context is already present inFLTK 1.4.The key is to call Fl_Graphics_Driver::scale(float s) to change thescaling factor and set it to 1. I attach a small
example program that redraws a button label
using an unscaled setting. ...

Great, I think this is exactly what Remy wanted. I modified the testprogram a bit drawing three rectangles:


- yellow (line width 1)
- green (line width 1)
- red (line width == scaling factor)

The attached screenshot has been taken with scaling 300% and you can seethe button borders scaled to the same width (3) as the red line and youcan also see the antialiased label. This is from Linux, BTW, and theimage has been zoomed for better visibility.

Since you can change the scaling factor while drawing inside the widgetor box(type) drawing code I believe Remy can do whatever he wants in hisown box drawing code, for instance drawing nice borders and gradients infull (1-pixel) resolution.


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Attachment: draw_unscaled.png
Description: PNG image

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