Skiasharp: [QUESTION] Is there a way to set the font height in pixels?

[Drise13]

I've been given a picture to recreate and the font height is specified in pixels. Is there a way to set up an SKPaint object to draw text to a pixel height instead of a point height?

[mattleibow]

You could use the ratio... formula:

points = pixels * 72 / 96

where 96 is the pixels per inch on a 100% DPI

[Ziriax]

I actually think the API documentation is wrong, at least that's the information I got from the Skia mailing list

The SkPaint.textSize is actually the height, in pixels, that a glyph with height 1 em would get when rendered on the canvas (length #13 in this image)

_The documentation incorrectly states SkPaint.TextSize is the height in points._

To verify this, I made a test program that uses this font from the Google Skia repo that has glyphs designed to have a height of 1 em units.

Here's the output of the program, the SkPaint.TextSize is 64 pixels, as is the height of the rectangle.

[mattleibow]

Good to know. Is this our docs that are wrong? I was not able to find any references to points with regards to text.

[Ziriax]

The pleasure is all mine, SkiaSharp rocks!

Only the Skia docs are wrong it seems, but the SkiaSharp doc is so brief that it is hard to understand the meaning :-)

Gets or sets the text size is not that useful for most users I guess? IMHO size could refer to width, height, line height, em height, etc...

[mattleibow]

Ah, yes. Heh, we need to improve that...

Would you like to open a PR ;)

https://github.com/mono/SkiaSharp-API-docs/blob/57ae4a903e9cba1627d0a7362d359a3d6ede80a9/SkiaSharpAPI/SkiaSharp/SKPaint.xml#L2987

[Ziriax]

Sure!

[mattleibow]

Fixed the docs.